Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NET4: Implementation of BSD Unix domain sockets. |
| 3 | * |
Alan Cox | 113aa83 | 2008-10-13 19:01:08 -0700 | [diff] [blame] | 4 | * Authors: Alan Cox, <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * Fixes: |
| 12 | * Linus Torvalds : Assorted bug cures. |
| 13 | * Niibe Yutaka : async I/O support. |
| 14 | * Carsten Paeth : PF_UNIX check, address fixes. |
| 15 | * Alan Cox : Limit size of allocated blocks. |
| 16 | * Alan Cox : Fixed the stupid socketpair bug. |
| 17 | * Alan Cox : BSD compatibility fine tuning. |
| 18 | * Alan Cox : Fixed a bug in connect when interrupted. |
| 19 | * Alan Cox : Sorted out a proper draft version of |
| 20 | * file descriptor passing hacked up from |
| 21 | * Mike Shaver's work. |
| 22 | * Marty Leisner : Fixes to fd passing |
| 23 | * Nick Nevin : recvmsg bugfix. |
| 24 | * Alan Cox : Started proper garbage collector |
| 25 | * Heiko EiBfeldt : Missing verify_area check |
| 26 | * Alan Cox : Started POSIXisms |
| 27 | * Andreas Schwab : Replace inode by dentry for proper |
| 28 | * reference counting |
| 29 | * Kirk Petersen : Made this a module |
| 30 | * Christoph Rohland : Elegant non-blocking accept/connect algorithm. |
| 31 | * Lots of bug fixes. |
| 32 | * Alexey Kuznetosv : Repaired (I hope) bugs introduces |
| 33 | * by above two patches. |
| 34 | * Andrea Arcangeli : If possible we block in connect(2) |
| 35 | * if the max backlog of the listen socket |
| 36 | * is been reached. This won't break |
| 37 | * old apps and it will avoid huge amount |
| 38 | * of socks hashed (this for unix_gc() |
| 39 | * performances reasons). |
| 40 | * Security fix that limits the max |
| 41 | * number of socks to 2*max_files and |
| 42 | * the number of skb queueable in the |
| 43 | * dgram receiver. |
| 44 | * Artur Skawina : Hash function optimizations |
| 45 | * Alexey Kuznetsov : Full scale SMP. Lot of bugs are introduced 8) |
| 46 | * Malcolm Beattie : Set peercred for socketpair |
| 47 | * Michal Ostrowski : Module initialization cleanup. |
| 48 | * Arnaldo C. Melo : Remove MOD_{INC,DEC}_USE_COUNT, |
| 49 | * the core infrastructure is doing that |
| 50 | * for all net proto families now (2.5.69+) |
| 51 | * |
| 52 | * |
| 53 | * Known differences from reference BSD that was tested: |
| 54 | * |
| 55 | * [TO FIX] |
| 56 | * ECONNREFUSED is not returned from one end of a connected() socket to the |
| 57 | * other the moment one end closes. |
| 58 | * fstat() doesn't return st_dev=0, and give the blksize as high water mark |
| 59 | * and a fake inode identifier (nor the BSD first socket fstat twice bug). |
| 60 | * [NOT TO FIX] |
| 61 | * accept() returns a path name even if the connecting socket has closed |
| 62 | * in the meantime (BSD loses the path and gives up). |
| 63 | * accept() returns 0 length path for an unbound connector. BSD returns 16 |
| 64 | * and a null first byte in the path (but not for gethost/peername - BSD bug ??) |
| 65 | * socketpair(...SOCK_RAW..) doesn't panic the kernel. |
| 66 | * BSD af_unix apparently has connect forgetting to block properly. |
| 67 | * (need to check this with the POSIX spec in detail) |
| 68 | * |
| 69 | * Differences from 2.0.0-11-... (ANK) |
| 70 | * Bug fixes and improvements. |
| 71 | * - client shutdown killed server socket. |
| 72 | * - removed all useless cli/sti pairs. |
| 73 | * |
| 74 | * Semantic changes/extensions. |
| 75 | * - generic control message passing. |
| 76 | * - SCM_CREDENTIALS control message. |
| 77 | * - "Abstract" (not FS based) socket bindings. |
| 78 | * Abstract names are sequences of bytes (not zero terminated) |
| 79 | * started by 0, so that this name space does not intersect |
| 80 | * with BSD names. |
| 81 | */ |
| 82 | |
wangweidong | 5cc208b | 2013-12-06 18:03:36 +0800 | [diff] [blame] | 83 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 84 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | #include <linux/signal.h> |
| 88 | #include <linux/sched.h> |
| 89 | #include <linux/errno.h> |
| 90 | #include <linux/string.h> |
| 91 | #include <linux/stat.h> |
| 92 | #include <linux/dcache.h> |
| 93 | #include <linux/namei.h> |
| 94 | #include <linux/socket.h> |
| 95 | #include <linux/un.h> |
| 96 | #include <linux/fcntl.h> |
| 97 | #include <linux/termios.h> |
| 98 | #include <linux/sockios.h> |
| 99 | #include <linux/net.h> |
| 100 | #include <linux/in.h> |
| 101 | #include <linux/fs.h> |
| 102 | #include <linux/slab.h> |
| 103 | #include <asm/uaccess.h> |
| 104 | #include <linux/skbuff.h> |
| 105 | #include <linux/netdevice.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 106 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | #include <net/sock.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 108 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | #include <net/af_unix.h> |
| 110 | #include <linux/proc_fs.h> |
| 111 | #include <linux/seq_file.h> |
| 112 | #include <net/scm.h> |
| 113 | #include <linux/init.h> |
| 114 | #include <linux/poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | #include <linux/rtnetlink.h> |
| 116 | #include <linux/mount.h> |
| 117 | #include <net/checksum.h> |
| 118 | #include <linux/security.h> |
Colin Cross | 2b15af6 | 2013-05-06 23:50:21 +0000 | [diff] [blame] | 119 | #include <linux/freezer.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 121 | struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE]; |
Pavel Emelyanov | fa7ff56 | 2011-12-15 02:44:03 +0000 | [diff] [blame] | 122 | EXPORT_SYMBOL_GPL(unix_socket_table); |
| 123 | DEFINE_SPINLOCK(unix_table_lock); |
| 124 | EXPORT_SYMBOL_GPL(unix_table_lock); |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 125 | static atomic_long_t unix_nr_socks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 128 | static struct hlist_head *unix_sockets_unbound(void *addr) |
| 129 | { |
| 130 | unsigned long hash = (unsigned long)addr; |
| 131 | |
| 132 | hash ^= hash >> 16; |
| 133 | hash ^= hash >> 8; |
| 134 | hash %= UNIX_HASH_SIZE; |
| 135 | return &unix_socket_table[UNIX_HASH_SIZE + hash]; |
| 136 | } |
| 137 | |
| 138 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash < UNIX_HASH_SIZE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 140 | #ifdef CONFIG_SECURITY_NETWORK |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 141 | static void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 142 | { |
Stephen Smalley | 37a9a8d | 2015-06-10 08:44:59 -0400 | [diff] [blame] | 143 | UNIXCB(skb).secid = scm->secid; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 144 | } |
| 145 | |
| 146 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
| 147 | { |
Stephen Smalley | 37a9a8d | 2015-06-10 08:44:59 -0400 | [diff] [blame] | 148 | scm->secid = UNIXCB(skb).secid; |
| 149 | } |
| 150 | |
| 151 | static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb) |
| 152 | { |
| 153 | return (scm->secid == UNIXCB(skb).secid); |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 154 | } |
| 155 | #else |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 156 | static inline void unix_get_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 157 | { } |
| 158 | |
| 159 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
| 160 | { } |
Stephen Smalley | 37a9a8d | 2015-06-10 08:44:59 -0400 | [diff] [blame] | 161 | |
| 162 | static inline bool unix_secdata_eq(struct scm_cookie *scm, struct sk_buff *skb) |
| 163 | { |
| 164 | return true; |
| 165 | } |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 166 | #endif /* CONFIG_SECURITY_NETWORK */ |
| 167 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | /* |
| 169 | * SMP locking strategy: |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 170 | * hash table is protected with spinlock unix_table_lock |
Stephen Hemminger | 663717f | 2010-02-18 14:12:06 -0800 | [diff] [blame] | 171 | * each socket state is protected by separate spin lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | */ |
| 173 | |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 174 | static inline unsigned int unix_hash_fold(__wsum n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | { |
Anton Blanchard | 0a13404 | 2014-03-05 14:29:58 +1100 | [diff] [blame] | 176 | unsigned int hash = (__force unsigned int)csum_fold(n); |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 177 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | hash ^= hash>>8; |
| 179 | return hash&(UNIX_HASH_SIZE-1); |
| 180 | } |
| 181 | |
| 182 | #define unix_peer(sk) (unix_sk(sk)->peer) |
| 183 | |
| 184 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) |
| 185 | { |
| 186 | return unix_peer(osk) == sk; |
| 187 | } |
| 188 | |
| 189 | static inline int unix_may_send(struct sock *sk, struct sock *osk) |
| 190 | { |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 191 | return unix_peer(osk) == NULL || unix_our_peer(sk, osk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 194 | static inline int unix_recvq_full(struct sock const *sk) |
| 195 | { |
| 196 | return skb_queue_len(&sk->sk_receive_queue) > sk->sk_max_ack_backlog; |
| 197 | } |
| 198 | |
Pavel Emelyanov | fa7ff56 | 2011-12-15 02:44:03 +0000 | [diff] [blame] | 199 | struct sock *unix_peer_get(struct sock *s) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | { |
| 201 | struct sock *peer; |
| 202 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 203 | unix_state_lock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | peer = unix_peer(s); |
| 205 | if (peer) |
| 206 | sock_hold(peer); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 207 | unix_state_unlock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | return peer; |
| 209 | } |
Pavel Emelyanov | fa7ff56 | 2011-12-15 02:44:03 +0000 | [diff] [blame] | 210 | EXPORT_SYMBOL_GPL(unix_peer_get); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | |
| 212 | static inline void unix_release_addr(struct unix_address *addr) |
| 213 | { |
| 214 | if (atomic_dec_and_test(&addr->refcnt)) |
| 215 | kfree(addr); |
| 216 | } |
| 217 | |
| 218 | /* |
| 219 | * Check unix socket name: |
| 220 | * - should be not zero length. |
| 221 | * - if started by not zero, should be NULL terminated (FS object) |
| 222 | * - if started by zero, it is abstract name. |
| 223 | */ |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 224 | |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 225 | static int unix_mkname(struct sockaddr_un *sunaddr, int len, unsigned int *hashp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | { |
| 227 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) |
| 228 | return -EINVAL; |
| 229 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) |
| 230 | return -EINVAL; |
| 231 | if (sunaddr->sun_path[0]) { |
| 232 | /* |
| 233 | * This may look like an off by one error but it is a bit more |
| 234 | * subtle. 108 is the longest valid AF_UNIX path for a binding. |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 235 | * sun_path[108] doesn't as such exist. However in kernel space |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | * we are guaranteed that it is a valid memory location in our |
| 237 | * kernel address buffer. |
| 238 | */ |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 239 | ((char *)sunaddr)[len] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | len = strlen(sunaddr->sun_path)+1+sizeof(short); |
| 241 | return len; |
| 242 | } |
| 243 | |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 244 | *hashp = unix_hash_fold(csum_partial(sunaddr, len, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | return len; |
| 246 | } |
| 247 | |
| 248 | static void __unix_remove_socket(struct sock *sk) |
| 249 | { |
| 250 | sk_del_node_init(sk); |
| 251 | } |
| 252 | |
| 253 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) |
| 254 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 255 | WARN_ON(!sk_unhashed(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | sk_add_node(sk, list); |
| 257 | } |
| 258 | |
| 259 | static inline void unix_remove_socket(struct sock *sk) |
| 260 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 261 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | __unix_remove_socket(sk); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 263 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) |
| 267 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 268 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | __unix_insert_socket(list, sk); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 270 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | } |
| 272 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 273 | static struct sock *__unix_find_socket_byname(struct net *net, |
| 274 | struct sockaddr_un *sunname, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 275 | int len, int type, unsigned int hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | { |
| 277 | struct sock *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 279 | sk_for_each(s, &unix_socket_table[hash ^ type]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | struct unix_sock *u = unix_sk(s); |
| 281 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 282 | if (!net_eq(sock_net(s), net)) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 283 | continue; |
| 284 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | if (u->addr->len == len && |
| 286 | !memcmp(u->addr->name, sunname, len)) |
| 287 | goto found; |
| 288 | } |
| 289 | s = NULL; |
| 290 | found: |
| 291 | return s; |
| 292 | } |
| 293 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 294 | static inline struct sock *unix_find_socket_byname(struct net *net, |
| 295 | struct sockaddr_un *sunname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | int len, int type, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 297 | unsigned int hash) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | { |
| 299 | struct sock *s; |
| 300 | |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 301 | spin_lock(&unix_table_lock); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 302 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | if (s) |
| 304 | sock_hold(s); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 305 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | return s; |
| 307 | } |
| 308 | |
Eric W. Biederman | 6616f78 | 2010-06-13 03:35:48 +0000 | [diff] [blame] | 309 | static struct sock *unix_find_socket_byinode(struct inode *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | { |
| 311 | struct sock *s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 313 | spin_lock(&unix_table_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 314 | sk_for_each(s, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { |
Al Viro | 40ffe67 | 2012-03-14 21:54:32 -0400 | [diff] [blame] | 316 | struct dentry *dentry = unix_sk(s)->path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
Miklos Szeredi | eb0a4a4 | 2016-05-20 22:13:45 +0200 | [diff] [blame] | 318 | if (dentry && d_real_inode(dentry) == i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | sock_hold(s); |
| 320 | goto found; |
| 321 | } |
| 322 | } |
| 323 | s = NULL; |
| 324 | found: |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 325 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | return s; |
| 327 | } |
| 328 | |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 329 | /* Support code for asymmetrically connected dgram sockets |
| 330 | * |
| 331 | * If a datagram socket is connected to a socket not itself connected |
| 332 | * to the first socket (eg, /dev/log), clients may only enqueue more |
| 333 | * messages if the present receive queue of the server socket is not |
| 334 | * "too large". This means there's a second writeability condition |
| 335 | * poll and sendmsg need to test. The dgram recv code will do a wake |
| 336 | * up on the peer_wait wait queue of a socket upon reception of a |
| 337 | * datagram which needs to be propagated to sleeping would-be writers |
| 338 | * since these might not have sent anything so far. This can't be |
| 339 | * accomplished via poll_wait because the lifetime of the server |
| 340 | * socket might be less than that of its clients if these break their |
| 341 | * association with it or if the server socket is closed while clients |
| 342 | * are still connected to it and there's no way to inform "a polling |
| 343 | * implementation" that it should let go of a certain wait queue |
| 344 | * |
| 345 | * In order to propagate a wake up, a wait_queue_t of the client |
| 346 | * socket is enqueued on the peer_wait queue of the server socket |
| 347 | * whose wake function does a wake_up on the ordinary client socket |
| 348 | * wait queue. This connection is established whenever a write (or |
| 349 | * poll for write) hit the flow control condition and broken when the |
| 350 | * association to the server socket is dissolved or after a wake up |
| 351 | * was relayed. |
| 352 | */ |
| 353 | |
| 354 | static int unix_dgram_peer_wake_relay(wait_queue_t *q, unsigned mode, int flags, |
| 355 | void *key) |
| 356 | { |
| 357 | struct unix_sock *u; |
| 358 | wait_queue_head_t *u_sleep; |
| 359 | |
| 360 | u = container_of(q, struct unix_sock, peer_wake); |
| 361 | |
| 362 | __remove_wait_queue(&unix_sk(u->peer_wake.private)->peer_wait, |
| 363 | q); |
| 364 | u->peer_wake.private = NULL; |
| 365 | |
| 366 | /* relaying can only happen while the wq still exists */ |
| 367 | u_sleep = sk_sleep(&u->sk); |
| 368 | if (u_sleep) |
| 369 | wake_up_interruptible_poll(u_sleep, key); |
| 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | static int unix_dgram_peer_wake_connect(struct sock *sk, struct sock *other) |
| 375 | { |
| 376 | struct unix_sock *u, *u_other; |
| 377 | int rc; |
| 378 | |
| 379 | u = unix_sk(sk); |
| 380 | u_other = unix_sk(other); |
| 381 | rc = 0; |
| 382 | spin_lock(&u_other->peer_wait.lock); |
| 383 | |
| 384 | if (!u->peer_wake.private) { |
| 385 | u->peer_wake.private = other; |
| 386 | __add_wait_queue(&u_other->peer_wait, &u->peer_wake); |
| 387 | |
| 388 | rc = 1; |
| 389 | } |
| 390 | |
| 391 | spin_unlock(&u_other->peer_wait.lock); |
| 392 | return rc; |
| 393 | } |
| 394 | |
| 395 | static void unix_dgram_peer_wake_disconnect(struct sock *sk, |
| 396 | struct sock *other) |
| 397 | { |
| 398 | struct unix_sock *u, *u_other; |
| 399 | |
| 400 | u = unix_sk(sk); |
| 401 | u_other = unix_sk(other); |
| 402 | spin_lock(&u_other->peer_wait.lock); |
| 403 | |
| 404 | if (u->peer_wake.private == other) { |
| 405 | __remove_wait_queue(&u_other->peer_wait, &u->peer_wake); |
| 406 | u->peer_wake.private = NULL; |
| 407 | } |
| 408 | |
| 409 | spin_unlock(&u_other->peer_wait.lock); |
| 410 | } |
| 411 | |
| 412 | static void unix_dgram_peer_wake_disconnect_wakeup(struct sock *sk, |
| 413 | struct sock *other) |
| 414 | { |
| 415 | unix_dgram_peer_wake_disconnect(sk, other); |
| 416 | wake_up_interruptible_poll(sk_sleep(sk), |
| 417 | POLLOUT | |
| 418 | POLLWRNORM | |
| 419 | POLLWRBAND); |
| 420 | } |
| 421 | |
| 422 | /* preconditions: |
| 423 | * - unix_peer(sk) == other |
| 424 | * - association is stable |
| 425 | */ |
| 426 | static int unix_dgram_peer_wake_me(struct sock *sk, struct sock *other) |
| 427 | { |
| 428 | int connected; |
| 429 | |
| 430 | connected = unix_dgram_peer_wake_connect(sk, other); |
| 431 | |
| 432 | if (unix_recvq_full(other)) |
| 433 | return 1; |
| 434 | |
| 435 | if (connected) |
| 436 | unix_dgram_peer_wake_disconnect(sk, other); |
| 437 | |
| 438 | return 0; |
| 439 | } |
| 440 | |
Eric Dumazet | 1586a58 | 2015-10-23 10:59:16 -0700 | [diff] [blame] | 441 | static int unix_writable(const struct sock *sk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | { |
Eric Dumazet | 1586a58 | 2015-10-23 10:59:16 -0700 | [diff] [blame] | 443 | return sk->sk_state != TCP_LISTEN && |
| 444 | (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | } |
| 446 | |
| 447 | static void unix_write_space(struct sock *sk) |
| 448 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 449 | struct socket_wq *wq; |
| 450 | |
| 451 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | if (unix_writable(sk)) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 453 | wq = rcu_dereference(sk->sk_wq); |
Herbert Xu | 1ce0bf5 | 2015-11-26 13:55:39 +0800 | [diff] [blame] | 454 | if (skwq_has_sleeper(wq)) |
Eric Dumazet | 67426b7 | 2010-10-29 20:44:44 +0000 | [diff] [blame] | 455 | wake_up_interruptible_sync_poll(&wq->wait, |
| 456 | POLLOUT | POLLWRNORM | POLLWRBAND); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 457 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 459 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | /* When dgram socket disconnects (or changes its peer), we clear its receive |
| 463 | * queue of packets arrived from previous peer. First, it allows to do |
| 464 | * flow control based only on wmem_alloc; second, sk connected to peer |
| 465 | * may receive messages only from that peer. */ |
| 466 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) |
| 467 | { |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 468 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | skb_queue_purge(&sk->sk_receive_queue); |
| 470 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); |
| 471 | |
| 472 | /* If one link of bidirectional dgram pipe is disconnected, |
| 473 | * we signal error. Messages are lost. Do not make this, |
| 474 | * when peer was not connected to us. |
| 475 | */ |
| 476 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { |
| 477 | other->sk_err = ECONNRESET; |
| 478 | other->sk_error_report(other); |
| 479 | } |
| 480 | } |
| 481 | } |
| 482 | |
| 483 | static void unix_sock_destructor(struct sock *sk) |
| 484 | { |
| 485 | struct unix_sock *u = unix_sk(sk); |
| 486 | |
| 487 | skb_queue_purge(&sk->sk_receive_queue); |
| 488 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 489 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 490 | WARN_ON(!sk_unhashed(sk)); |
| 491 | WARN_ON(sk->sk_socket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | if (!sock_flag(sk, SOCK_DEAD)) { |
wangweidong | 5cc208b | 2013-12-06 18:03:36 +0800 | [diff] [blame] | 493 | pr_info("Attempt to release alive unix socket: %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | return; |
| 495 | } |
| 496 | |
| 497 | if (u->addr) |
| 498 | unix_release_addr(u->addr); |
| 499 | |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 500 | atomic_long_dec(&unix_nr_socks); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 501 | local_bh_disable(); |
Eric Dumazet | a8076d8 | 2008-11-17 02:38:49 -0800 | [diff] [blame] | 502 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 503 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | #ifdef UNIX_REFCNT_DEBUG |
wangweidong | 5cc208b | 2013-12-06 18:03:36 +0800 | [diff] [blame] | 505 | pr_debug("UNIX %p is destroyed, %ld are still alive.\n", sk, |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 506 | atomic_long_read(&unix_nr_socks)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 507 | #endif |
| 508 | } |
| 509 | |
Paul Moore | ded34e0 | 2013-03-25 03:18:33 +0000 | [diff] [blame] | 510 | static void unix_release_sock(struct sock *sk, int embrion) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | { |
| 512 | struct unix_sock *u = unix_sk(sk); |
Al Viro | 40ffe67 | 2012-03-14 21:54:32 -0400 | [diff] [blame] | 513 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | struct sock *skpair; |
| 515 | struct sk_buff *skb; |
| 516 | int state; |
| 517 | |
| 518 | unix_remove_socket(sk); |
| 519 | |
| 520 | /* Clear state */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 521 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | sock_orphan(sk); |
| 523 | sk->sk_shutdown = SHUTDOWN_MASK; |
Al Viro | 40ffe67 | 2012-03-14 21:54:32 -0400 | [diff] [blame] | 524 | path = u->path; |
| 525 | u->path.dentry = NULL; |
| 526 | u->path.mnt = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | state = sk->sk_state; |
| 528 | sk->sk_state = TCP_CLOSE; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 529 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
| 531 | wake_up_interruptible_all(&u->peer_wait); |
| 532 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 533 | skpair = unix_peer(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 535 | if (skpair != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 537 | unix_state_lock(skpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | /* No more writes */ |
| 539 | skpair->sk_shutdown = SHUTDOWN_MASK; |
| 540 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) |
| 541 | skpair->sk_err = ECONNRESET; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 542 | unix_state_unlock(skpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | skpair->sk_state_change(skpair); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 544 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | } |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 546 | |
| 547 | unix_dgram_peer_wake_disconnect(sk, skpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | sock_put(skpair); /* It may now die */ |
| 549 | unix_peer(sk) = NULL; |
| 550 | } |
| 551 | |
| 552 | /* Try to flush out this socket. Throw out buffers at least */ |
| 553 | |
| 554 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 555 | if (state == TCP_LISTEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | unix_release_sock(skb->sk, 1); |
| 557 | /* passed fds are erased in the kfree_skb hook */ |
Hannes Frederic Sowa | 73ed5d2 | 2015-11-10 16:23:15 +0100 | [diff] [blame] | 558 | UNIXCB(skb).consumed = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | kfree_skb(skb); |
| 560 | } |
| 561 | |
Al Viro | 40ffe67 | 2012-03-14 21:54:32 -0400 | [diff] [blame] | 562 | if (path.dentry) |
| 563 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
| 565 | sock_put(sk); |
| 566 | |
| 567 | /* ---- Socket is dead now and most probably destroyed ---- */ |
| 568 | |
| 569 | /* |
Alan Cox | e04dae8 | 2012-09-17 00:52:41 +0000 | [diff] [blame] | 570 | * Fixme: BSD difference: In BSD all sockets connected to us get |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | * ECONNRESET and we die on the spot. In Linux we behave |
| 572 | * like files and pipes do and wait for the last |
| 573 | * dereference. |
| 574 | * |
| 575 | * Can't we simply set sock->err? |
| 576 | * |
| 577 | * What the above comment does talk about? --ANK(980817) |
| 578 | */ |
| 579 | |
Pavel Emelyanov | 9305cfa | 2007-11-10 22:06:01 -0800 | [diff] [blame] | 580 | if (unix_tot_inflight) |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 581 | unix_gc(); /* Garbage collect fds */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
| 583 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 584 | static void init_peercred(struct sock *sk) |
| 585 | { |
| 586 | put_pid(sk->sk_peer_pid); |
| 587 | if (sk->sk_peer_cred) |
| 588 | put_cred(sk->sk_peer_cred); |
| 589 | sk->sk_peer_pid = get_pid(task_tgid(current)); |
| 590 | sk->sk_peer_cred = get_current_cred(); |
| 591 | } |
| 592 | |
| 593 | static void copy_peercred(struct sock *sk, struct sock *peersk) |
| 594 | { |
| 595 | put_pid(sk->sk_peer_pid); |
| 596 | if (sk->sk_peer_cred) |
| 597 | put_cred(sk->sk_peer_cred); |
| 598 | sk->sk_peer_pid = get_pid(peersk->sk_peer_pid); |
| 599 | sk->sk_peer_cred = get_cred(peersk->sk_peer_cred); |
| 600 | } |
| 601 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | static int unix_listen(struct socket *sock, int backlog) |
| 603 | { |
| 604 | int err; |
| 605 | struct sock *sk = sock->sk; |
| 606 | struct unix_sock *u = unix_sk(sk); |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 607 | struct pid *old_pid = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | |
| 609 | err = -EOPNOTSUPP; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 610 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
| 611 | goto out; /* Only stream/seqpacket sockets accept */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | err = -EINVAL; |
| 613 | if (!u->addr) |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 614 | goto out; /* No listens on an unbound socket */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 615 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
| 617 | goto out_unlock; |
| 618 | if (backlog > sk->sk_max_ack_backlog) |
| 619 | wake_up_interruptible_all(&u->peer_wait); |
| 620 | sk->sk_max_ack_backlog = backlog; |
| 621 | sk->sk_state = TCP_LISTEN; |
| 622 | /* set credentials so connect can copy them */ |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 623 | init_peercred(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | err = 0; |
| 625 | |
| 626 | out_unlock: |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 627 | unix_state_unlock(sk); |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 628 | put_pid(old_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | out: |
| 630 | return err; |
| 631 | } |
| 632 | |
| 633 | static int unix_release(struct socket *); |
| 634 | static int unix_bind(struct socket *, struct sockaddr *, int); |
| 635 | static int unix_stream_connect(struct socket *, struct sockaddr *, |
| 636 | int addr_len, int flags); |
| 637 | static int unix_socketpair(struct socket *, struct socket *); |
| 638 | static int unix_accept(struct socket *, struct socket *, int); |
| 639 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); |
| 640 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 641 | static unsigned int unix_dgram_poll(struct file *, struct socket *, |
| 642 | poll_table *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); |
| 644 | static int unix_shutdown(struct socket *, int); |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 645 | static int unix_stream_sendmsg(struct socket *, struct msghdr *, size_t); |
| 646 | static int unix_stream_recvmsg(struct socket *, struct msghdr *, size_t, int); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 647 | static ssize_t unix_stream_sendpage(struct socket *, struct page *, int offset, |
| 648 | size_t size, int flags); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 649 | static ssize_t unix_stream_splice_read(struct socket *, loff_t *ppos, |
| 650 | struct pipe_inode_info *, size_t size, |
| 651 | unsigned int flags); |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 652 | static int unix_dgram_sendmsg(struct socket *, struct msghdr *, size_t); |
| 653 | static int unix_dgram_recvmsg(struct socket *, struct msghdr *, size_t, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | static int unix_dgram_connect(struct socket *, struct sockaddr *, |
| 655 | int, int); |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 656 | static int unix_seqpacket_sendmsg(struct socket *, struct msghdr *, size_t); |
| 657 | static int unix_seqpacket_recvmsg(struct socket *, struct msghdr *, size_t, |
| 658 | int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Sasha Levin | 12663bf | 2013-12-07 17:26:27 -0500 | [diff] [blame] | 660 | static int unix_set_peek_off(struct sock *sk, int val) |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 661 | { |
| 662 | struct unix_sock *u = unix_sk(sk); |
| 663 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 664 | if (mutex_lock_interruptible(&u->iolock)) |
Sasha Levin | 12663bf | 2013-12-07 17:26:27 -0500 | [diff] [blame] | 665 | return -EINTR; |
| 666 | |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 667 | sk->sk_peek_off = val; |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 668 | mutex_unlock(&u->iolock); |
Sasha Levin | 12663bf | 2013-12-07 17:26:27 -0500 | [diff] [blame] | 669 | |
| 670 | return 0; |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 671 | } |
| 672 | |
| 673 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 674 | static const struct proto_ops unix_stream_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | .family = PF_UNIX, |
| 676 | .owner = THIS_MODULE, |
| 677 | .release = unix_release, |
| 678 | .bind = unix_bind, |
| 679 | .connect = unix_stream_connect, |
| 680 | .socketpair = unix_socketpair, |
| 681 | .accept = unix_accept, |
| 682 | .getname = unix_getname, |
| 683 | .poll = unix_poll, |
| 684 | .ioctl = unix_ioctl, |
| 685 | .listen = unix_listen, |
| 686 | .shutdown = unix_shutdown, |
| 687 | .setsockopt = sock_no_setsockopt, |
| 688 | .getsockopt = sock_no_getsockopt, |
| 689 | .sendmsg = unix_stream_sendmsg, |
| 690 | .recvmsg = unix_stream_recvmsg, |
| 691 | .mmap = sock_no_mmap, |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 692 | .sendpage = unix_stream_sendpage, |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 693 | .splice_read = unix_stream_splice_read, |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 694 | .set_peek_off = unix_set_peek_off, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | }; |
| 696 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 697 | static const struct proto_ops unix_dgram_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | .family = PF_UNIX, |
| 699 | .owner = THIS_MODULE, |
| 700 | .release = unix_release, |
| 701 | .bind = unix_bind, |
| 702 | .connect = unix_dgram_connect, |
| 703 | .socketpair = unix_socketpair, |
| 704 | .accept = sock_no_accept, |
| 705 | .getname = unix_getname, |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 706 | .poll = unix_dgram_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | .ioctl = unix_ioctl, |
| 708 | .listen = sock_no_listen, |
| 709 | .shutdown = unix_shutdown, |
| 710 | .setsockopt = sock_no_setsockopt, |
| 711 | .getsockopt = sock_no_getsockopt, |
| 712 | .sendmsg = unix_dgram_sendmsg, |
| 713 | .recvmsg = unix_dgram_recvmsg, |
| 714 | .mmap = sock_no_mmap, |
| 715 | .sendpage = sock_no_sendpage, |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 716 | .set_peek_off = unix_set_peek_off, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | }; |
| 718 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 719 | static const struct proto_ops unix_seqpacket_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | .family = PF_UNIX, |
| 721 | .owner = THIS_MODULE, |
| 722 | .release = unix_release, |
| 723 | .bind = unix_bind, |
| 724 | .connect = unix_stream_connect, |
| 725 | .socketpair = unix_socketpair, |
| 726 | .accept = unix_accept, |
| 727 | .getname = unix_getname, |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 728 | .poll = unix_dgram_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | .ioctl = unix_ioctl, |
| 730 | .listen = unix_listen, |
| 731 | .shutdown = unix_shutdown, |
| 732 | .setsockopt = sock_no_setsockopt, |
| 733 | .getsockopt = sock_no_getsockopt, |
| 734 | .sendmsg = unix_seqpacket_sendmsg, |
Eric W. Biederman | a05d2ad | 2011-04-24 01:54:57 +0000 | [diff] [blame] | 735 | .recvmsg = unix_seqpacket_recvmsg, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | .mmap = sock_no_mmap, |
| 737 | .sendpage = sock_no_sendpage, |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 738 | .set_peek_off = unix_set_peek_off, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 739 | }; |
| 740 | |
| 741 | static struct proto unix_proto = { |
Eric Dumazet | 248969a | 2008-11-17 00:00:30 -0800 | [diff] [blame] | 742 | .name = "UNIX", |
| 743 | .owner = THIS_MODULE, |
Eric Dumazet | 248969a | 2008-11-17 00:00:30 -0800 | [diff] [blame] | 744 | .obj_size = sizeof(struct unix_sock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | }; |
| 746 | |
Ingo Molnar | a09785a | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 747 | /* |
| 748 | * AF_UNIX sockets do not interact with hardware, hence they |
| 749 | * dont trigger interrupts - so it's safe for them to have |
| 750 | * bh-unsafe locking for their sk_receive_queue.lock. Split off |
| 751 | * this special lock-class by reinitializing the spinlock key: |
| 752 | */ |
| 753 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; |
| 754 | |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 755 | static struct sock *unix_create1(struct net *net, struct socket *sock, int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | { |
| 757 | struct sock *sk = NULL; |
| 758 | struct unix_sock *u; |
| 759 | |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 760 | atomic_long_inc(&unix_nr_socks); |
| 761 | if (atomic_long_read(&unix_nr_socks) > 2 * get_max_files()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | goto out; |
| 763 | |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 764 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto, kern); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 765 | if (!sk) |
| 766 | goto out; |
| 767 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 768 | sock_init_data(sock, sk); |
Ingo Molnar | a09785a | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 769 | lockdep_set_class(&sk->sk_receive_queue.lock, |
| 770 | &af_unix_sk_receive_queue_lock_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 771 | |
Vladimir Davydov | 3aa9799 | 2016-07-26 15:24:36 -0700 | [diff] [blame] | 772 | sk->sk_allocation = GFP_KERNEL_ACCOUNT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | sk->sk_write_space = unix_write_space; |
Denis V. Lunev | a0a53c8 | 2007-12-11 04:19:17 -0800 | [diff] [blame] | 774 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | sk->sk_destruct = unix_sock_destructor; |
| 776 | u = unix_sk(sk); |
Al Viro | 40ffe67 | 2012-03-14 21:54:32 -0400 | [diff] [blame] | 777 | u->path.dentry = NULL; |
| 778 | u->path.mnt = NULL; |
Benjamin LaHaise | fd19f32 | 2006-01-03 14:10:46 -0800 | [diff] [blame] | 779 | spin_lock_init(&u->lock); |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 780 | atomic_long_set(&u->inflight, 0); |
Miklos Szeredi | 1fd05ba | 2007-07-11 14:22:39 -0700 | [diff] [blame] | 781 | INIT_LIST_HEAD(&u->link); |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 782 | mutex_init(&u->iolock); /* single task reading lock */ |
| 783 | mutex_init(&u->bindlock); /* single task binding lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | init_waitqueue_head(&u->peer_wait); |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 785 | init_waitqueue_func_entry(&u->peer_wake, unix_dgram_peer_wake_relay); |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 786 | unix_insert_socket(unix_sockets_unbound(sk), sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | out: |
Pavel Emelyanov | 284b327 | 2007-11-10 22:08:30 -0800 | [diff] [blame] | 788 | if (sk == NULL) |
Eric Dumazet | 518de9b | 2010-10-26 14:22:44 -0700 | [diff] [blame] | 789 | atomic_long_dec(&unix_nr_socks); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 790 | else { |
| 791 | local_bh_disable(); |
Eric Dumazet | a8076d8 | 2008-11-17 02:38:49 -0800 | [diff] [blame] | 792 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 793 | local_bh_enable(); |
| 794 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | return sk; |
| 796 | } |
| 797 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 798 | static int unix_create(struct net *net, struct socket *sock, int protocol, |
| 799 | int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | { |
| 801 | if (protocol && protocol != PF_UNIX) |
| 802 | return -EPROTONOSUPPORT; |
| 803 | |
| 804 | sock->state = SS_UNCONNECTED; |
| 805 | |
| 806 | switch (sock->type) { |
| 807 | case SOCK_STREAM: |
| 808 | sock->ops = &unix_stream_ops; |
| 809 | break; |
| 810 | /* |
| 811 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though |
| 812 | * nothing uses it. |
| 813 | */ |
| 814 | case SOCK_RAW: |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 815 | sock->type = SOCK_DGRAM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | case SOCK_DGRAM: |
| 817 | sock->ops = &unix_dgram_ops; |
| 818 | break; |
| 819 | case SOCK_SEQPACKET: |
| 820 | sock->ops = &unix_seqpacket_ops; |
| 821 | break; |
| 822 | default: |
| 823 | return -ESOCKTNOSUPPORT; |
| 824 | } |
| 825 | |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 826 | return unix_create1(net, sock, kern) ? 0 : -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | } |
| 828 | |
| 829 | static int unix_release(struct socket *sock) |
| 830 | { |
| 831 | struct sock *sk = sock->sk; |
| 832 | |
| 833 | if (!sk) |
| 834 | return 0; |
| 835 | |
Paul Moore | ded34e0 | 2013-03-25 03:18:33 +0000 | [diff] [blame] | 836 | unix_release_sock(sk, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | sock->sk = NULL; |
| 838 | |
Paul Moore | ded34e0 | 2013-03-25 03:18:33 +0000 | [diff] [blame] | 839 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | } |
| 841 | |
| 842 | static int unix_autobind(struct socket *sock) |
| 843 | { |
| 844 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 845 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | struct unix_sock *u = unix_sk(sk); |
| 847 | static u32 ordernum = 1; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 848 | struct unix_address *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | int err; |
Tetsuo Handa | 8df73ff | 2010-09-04 01:34:28 +0000 | [diff] [blame] | 850 | unsigned int retries = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 851 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 852 | err = mutex_lock_interruptible(&u->bindlock); |
Sasha Levin | 37ab4fa | 2013-12-13 10:54:22 -0500 | [diff] [blame] | 853 | if (err) |
| 854 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | |
| 856 | err = 0; |
| 857 | if (u->addr) |
| 858 | goto out; |
| 859 | |
| 860 | err = -ENOMEM; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 861 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | if (!addr) |
| 863 | goto out; |
| 864 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | addr->name->sun_family = AF_UNIX; |
| 866 | atomic_set(&addr->refcnt, 1); |
| 867 | |
| 868 | retry: |
| 869 | addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 870 | addr->hash = unix_hash_fold(csum_partial(addr->name, addr->len, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 872 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | ordernum = (ordernum+1)&0xFFFFF; |
| 874 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 875 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | addr->hash)) { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 877 | spin_unlock(&unix_table_lock); |
Tetsuo Handa | 8df73ff | 2010-09-04 01:34:28 +0000 | [diff] [blame] | 878 | /* |
| 879 | * __unix_find_socket_byname() may take long time if many names |
| 880 | * are already in use. |
| 881 | */ |
| 882 | cond_resched(); |
| 883 | /* Give up if all names seems to be in use. */ |
| 884 | if (retries++ == 0xFFFFF) { |
| 885 | err = -ENOSPC; |
| 886 | kfree(addr); |
| 887 | goto out; |
| 888 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | goto retry; |
| 890 | } |
| 891 | addr->hash ^= sk->sk_type; |
| 892 | |
| 893 | __unix_remove_socket(sk); |
| 894 | u->addr = addr; |
| 895 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 896 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | err = 0; |
| 898 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 899 | out: mutex_unlock(&u->bindlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | return err; |
| 901 | } |
| 902 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 903 | static struct sock *unix_find_other(struct net *net, |
| 904 | struct sockaddr_un *sunname, int len, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 905 | int type, unsigned int hash, int *error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | { |
| 907 | struct sock *u; |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 908 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | int err = 0; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 910 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | if (sunname->sun_path[0]) { |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 912 | struct inode *inode; |
| 913 | err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | if (err) |
| 915 | goto fail; |
Miklos Szeredi | eb0a4a4 | 2016-05-20 22:13:45 +0200 | [diff] [blame] | 916 | inode = d_real_inode(path.dentry); |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 917 | err = inode_permission(inode, MAY_WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | if (err) |
| 919 | goto put_fail; |
| 920 | |
| 921 | err = -ECONNREFUSED; |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 922 | if (!S_ISSOCK(inode->i_mode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | goto put_fail; |
Eric W. Biederman | 6616f78 | 2010-06-13 03:35:48 +0000 | [diff] [blame] | 924 | u = unix_find_socket_byinode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | if (!u) |
| 926 | goto put_fail; |
| 927 | |
| 928 | if (u->sk_type == type) |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 929 | touch_atime(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 931 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 933 | err = -EPROTOTYPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | if (u->sk_type != type) { |
| 935 | sock_put(u); |
| 936 | goto fail; |
| 937 | } |
| 938 | } else { |
| 939 | err = -ECONNREFUSED; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 940 | u = unix_find_socket_byname(net, sunname, len, type, hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | if (u) { |
| 942 | struct dentry *dentry; |
Al Viro | 40ffe67 | 2012-03-14 21:54:32 -0400 | [diff] [blame] | 943 | dentry = unix_sk(u)->path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | if (dentry) |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 945 | touch_atime(&unix_sk(u)->path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } else |
| 947 | goto fail; |
| 948 | } |
| 949 | return u; |
| 950 | |
| 951 | put_fail: |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 952 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | fail: |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 954 | *error = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | return NULL; |
| 956 | } |
| 957 | |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 958 | static int unix_mknod(const char *sun_path, umode_t mode, struct path *res) |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 959 | { |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 960 | struct dentry *dentry; |
| 961 | struct path path; |
| 962 | int err = 0; |
| 963 | /* |
| 964 | * Get the parent directory, calculate the hash for last |
| 965 | * component. |
| 966 | */ |
| 967 | dentry = kern_path_create(AT_FDCWD, sun_path, &path, 0); |
| 968 | err = PTR_ERR(dentry); |
| 969 | if (IS_ERR(dentry)) |
| 970 | return err; |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 971 | |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 972 | /* |
| 973 | * All right, let's create it. |
| 974 | */ |
| 975 | err = security_path_mknod(&path, dentry, mode, 0); |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 976 | if (!err) { |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 977 | err = vfs_mknod(d_inode(path.dentry), dentry, mode, 0); |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 978 | if (!err) { |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 979 | res->mnt = mntget(path.mnt); |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 980 | res->dentry = dget(dentry); |
| 981 | } |
| 982 | } |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 983 | done_path_create(&path, dentry); |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 984 | return err; |
| 985 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 986 | |
| 987 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 988 | { |
| 989 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 990 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | struct unix_sock *u = unix_sk(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 992 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
Al Viro | dae6ad8 | 2011-06-26 11:50:15 -0400 | [diff] [blame] | 993 | char *sun_path = sunaddr->sun_path; |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 994 | int err; |
Kyle Yan | 74fdd73 | 2017-03-22 13:37:08 -0700 | [diff] [blame] | 995 | unsigned int hash = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | struct unix_address *addr; |
| 997 | struct hlist_head *list; |
WANG Cong | 93ff5e0 | 2017-01-23 11:17:35 -0800 | [diff] [blame] | 998 | struct path path = { NULL, NULL }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
| 1000 | err = -EINVAL; |
Mateusz Jurczyk | bb84290 | 2017-06-08 11:13:36 +0200 | [diff] [blame] | 1001 | if (addr_len < offsetofend(struct sockaddr_un, sun_family) || |
| 1002 | sunaddr->sun_family != AF_UNIX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1003 | goto out; |
| 1004 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1005 | if (addr_len == sizeof(short)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1006 | err = unix_autobind(sock); |
| 1007 | goto out; |
| 1008 | } |
| 1009 | |
| 1010 | err = unix_mkname(sunaddr, addr_len, &hash); |
| 1011 | if (err < 0) |
| 1012 | goto out; |
| 1013 | addr_len = err; |
| 1014 | |
WANG Cong | 93ff5e0 | 2017-01-23 11:17:35 -0800 | [diff] [blame] | 1015 | if (sun_path[0]) { |
| 1016 | umode_t mode = S_IFSOCK | |
| 1017 | (SOCK_INODE(sock)->i_mode & ~current_umask()); |
| 1018 | err = unix_mknod(sun_path, mode, &path); |
| 1019 | if (err) { |
| 1020 | if (err == -EEXIST) |
| 1021 | err = -EADDRINUSE; |
| 1022 | goto out; |
| 1023 | } |
| 1024 | } |
| 1025 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 1026 | err = mutex_lock_interruptible(&u->bindlock); |
Sasha Levin | 37ab4fa | 2013-12-13 10:54:22 -0500 | [diff] [blame] | 1027 | if (err) |
WANG Cong | 93ff5e0 | 2017-01-23 11:17:35 -0800 | [diff] [blame] | 1028 | goto out_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
| 1030 | err = -EINVAL; |
| 1031 | if (u->addr) |
| 1032 | goto out_up; |
| 1033 | |
| 1034 | err = -ENOMEM; |
| 1035 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); |
| 1036 | if (!addr) |
| 1037 | goto out_up; |
| 1038 | |
| 1039 | memcpy(addr->name, sunaddr, addr_len); |
| 1040 | addr->len = addr_len; |
| 1041 | addr->hash = hash ^ sk->sk_type; |
| 1042 | atomic_set(&addr->refcnt, 1); |
| 1043 | |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 1044 | if (sun_path[0]) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | addr->hash = UNIX_HASH_SIZE; |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 1046 | hash = d_real_inode(path.dentry)->i_ino & (UNIX_HASH_SIZE - 1); |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 1047 | spin_lock(&unix_table_lock); |
Linus Torvalds | 38f7bd9 | 2016-09-01 14:56:49 -0700 | [diff] [blame] | 1048 | u->path = path; |
Al Viro | faf0201 | 2012-07-20 02:37:29 +0400 | [diff] [blame] | 1049 | list = &unix_socket_table[hash]; |
| 1050 | } else { |
| 1051 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | err = -EADDRINUSE; |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 1053 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1054 | sk->sk_type, hash)) { |
| 1055 | unix_release_addr(addr); |
| 1056 | goto out_unlock; |
| 1057 | } |
| 1058 | |
| 1059 | list = &unix_socket_table[addr->hash]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | } |
| 1061 | |
| 1062 | err = 0; |
| 1063 | __unix_remove_socket(sk); |
| 1064 | u->addr = addr; |
| 1065 | __unix_insert_socket(list, sk); |
| 1066 | |
| 1067 | out_unlock: |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 1068 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1069 | out_up: |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 1070 | mutex_unlock(&u->bindlock); |
WANG Cong | 93ff5e0 | 2017-01-23 11:17:35 -0800 | [diff] [blame] | 1071 | out_put: |
| 1072 | if (err) |
| 1073 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | out: |
| 1075 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | } |
| 1077 | |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1078 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
| 1079 | { |
| 1080 | if (unlikely(sk1 == sk2) || !sk2) { |
| 1081 | unix_state_lock(sk1); |
| 1082 | return; |
| 1083 | } |
| 1084 | if (sk1 < sk2) { |
| 1085 | unix_state_lock(sk1); |
| 1086 | unix_state_lock_nested(sk2); |
| 1087 | } else { |
| 1088 | unix_state_lock(sk2); |
| 1089 | unix_state_lock_nested(sk1); |
| 1090 | } |
| 1091 | } |
| 1092 | |
| 1093 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) |
| 1094 | { |
| 1095 | if (unlikely(sk1 == sk2) || !sk2) { |
| 1096 | unix_state_unlock(sk1); |
| 1097 | return; |
| 1098 | } |
| 1099 | unix_state_unlock(sk1); |
| 1100 | unix_state_unlock(sk2); |
| 1101 | } |
| 1102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
| 1104 | int alen, int flags) |
| 1105 | { |
| 1106 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1107 | struct net *net = sock_net(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1108 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | struct sock *other; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1110 | unsigned int hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | int err; |
| 1112 | |
Mateusz Jurczyk | bb84290 | 2017-06-08 11:13:36 +0200 | [diff] [blame] | 1113 | err = -EINVAL; |
| 1114 | if (alen < offsetofend(struct sockaddr, sa_family)) |
| 1115 | goto out; |
| 1116 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1117 | if (addr->sa_family != AF_UNSPEC) { |
| 1118 | err = unix_mkname(sunaddr, alen, &hash); |
| 1119 | if (err < 0) |
| 1120 | goto out; |
| 1121 | alen = err; |
| 1122 | |
| 1123 | if (test_bit(SOCK_PASSCRED, &sock->flags) && |
| 1124 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) |
| 1125 | goto out; |
| 1126 | |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1127 | restart: |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1128 | other = unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | if (!other) |
| 1130 | goto out; |
| 1131 | |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1132 | unix_state_double_lock(sk, other); |
| 1133 | |
| 1134 | /* Apparently VFS overslept socket death. Retry. */ |
| 1135 | if (sock_flag(other, SOCK_DEAD)) { |
| 1136 | unix_state_double_unlock(sk, other); |
| 1137 | sock_put(other); |
| 1138 | goto restart; |
| 1139 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | |
| 1141 | err = -EPERM; |
| 1142 | if (!unix_may_send(sk, other)) |
| 1143 | goto out_unlock; |
| 1144 | |
| 1145 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); |
| 1146 | if (err) |
| 1147 | goto out_unlock; |
| 1148 | |
| 1149 | } else { |
| 1150 | /* |
| 1151 | * 1003.1g breaking connected state with AF_UNSPEC |
| 1152 | */ |
| 1153 | other = NULL; |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1154 | unix_state_double_lock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | } |
| 1156 | |
| 1157 | /* |
| 1158 | * If it was connected, reconnect. |
| 1159 | */ |
| 1160 | if (unix_peer(sk)) { |
| 1161 | struct sock *old_peer = unix_peer(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1162 | unix_peer(sk) = other; |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1163 | unix_dgram_peer_wake_disconnect_wakeup(sk, old_peer); |
| 1164 | |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1165 | unix_state_double_unlock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1166 | |
| 1167 | if (other != old_peer) |
| 1168 | unix_dgram_disconnected(sk, old_peer); |
| 1169 | sock_put(old_peer); |
| 1170 | } else { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1171 | unix_peer(sk) = other; |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1172 | unix_state_double_unlock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1174 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | |
| 1176 | out_unlock: |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1177 | unix_state_double_unlock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | sock_put(other); |
| 1179 | out: |
| 1180 | return err; |
| 1181 | } |
| 1182 | |
| 1183 | static long unix_wait_for_peer(struct sock *other, long timeo) |
| 1184 | { |
| 1185 | struct unix_sock *u = unix_sk(other); |
| 1186 | int sched; |
| 1187 | DEFINE_WAIT(wait); |
| 1188 | |
| 1189 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); |
| 1190 | |
| 1191 | sched = !sock_flag(other, SOCK_DEAD) && |
| 1192 | !(other->sk_shutdown & RCV_SHUTDOWN) && |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 1193 | unix_recvq_full(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1195 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
| 1197 | if (sched) |
| 1198 | timeo = schedule_timeout(timeo); |
| 1199 | |
| 1200 | finish_wait(&u->peer_wait, &wait); |
| 1201 | return timeo; |
| 1202 | } |
| 1203 | |
| 1204 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
| 1205 | int addr_len, int flags) |
| 1206 | { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1207 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1209 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
| 1211 | struct sock *newsk = NULL; |
| 1212 | struct sock *other = NULL; |
| 1213 | struct sk_buff *skb = NULL; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1214 | unsigned int hash; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | int st; |
| 1216 | int err; |
| 1217 | long timeo; |
| 1218 | |
| 1219 | err = unix_mkname(sunaddr, addr_len, &hash); |
| 1220 | if (err < 0) |
| 1221 | goto out; |
| 1222 | addr_len = err; |
| 1223 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1224 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr && |
| 1225 | (err = unix_autobind(sock)) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | goto out; |
| 1227 | |
| 1228 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
| 1229 | |
| 1230 | /* First of all allocate resources. |
| 1231 | If we will make it after state is locked, |
| 1232 | we will have to recheck all again in any case. |
| 1233 | */ |
| 1234 | |
| 1235 | err = -ENOMEM; |
| 1236 | |
| 1237 | /* create new sock for complete connection */ |
Eric W. Biederman | 11aa9c2 | 2015-05-08 21:09:13 -0500 | [diff] [blame] | 1238 | newsk = unix_create1(sock_net(sk), NULL, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1239 | if (newsk == NULL) |
| 1240 | goto out; |
| 1241 | |
| 1242 | /* Allocate skb for sending to listening sock */ |
| 1243 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); |
| 1244 | if (skb == NULL) |
| 1245 | goto out; |
| 1246 | |
| 1247 | restart: |
| 1248 | /* Find listening sock. */ |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 1249 | other = unix_find_other(net, sunaddr, addr_len, sk->sk_type, hash, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | if (!other) |
| 1251 | goto out; |
| 1252 | |
| 1253 | /* Latch state of peer */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1254 | unix_state_lock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
| 1256 | /* Apparently VFS overslept socket death. Retry. */ |
| 1257 | if (sock_flag(other, SOCK_DEAD)) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1258 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | sock_put(other); |
| 1260 | goto restart; |
| 1261 | } |
| 1262 | |
| 1263 | err = -ECONNREFUSED; |
| 1264 | if (other->sk_state != TCP_LISTEN) |
| 1265 | goto out_unlock; |
Tomoki Sekiyama | 77238f2 | 2009-10-18 23:17:37 -0700 | [diff] [blame] | 1266 | if (other->sk_shutdown & RCV_SHUTDOWN) |
| 1267 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1268 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 1269 | if (unix_recvq_full(other)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | err = -EAGAIN; |
| 1271 | if (!timeo) |
| 1272 | goto out_unlock; |
| 1273 | |
| 1274 | timeo = unix_wait_for_peer(other, timeo); |
| 1275 | |
| 1276 | err = sock_intr_errno(timeo); |
| 1277 | if (signal_pending(current)) |
| 1278 | goto out; |
| 1279 | sock_put(other); |
| 1280 | goto restart; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1281 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | |
| 1283 | /* Latch our state. |
| 1284 | |
Daniel Baluta | e5537bf | 2011-03-14 15:25:33 -0700 | [diff] [blame] | 1285 | It is tricky place. We need to grab our state lock and cannot |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | drop lock on peer. It is dangerous because deadlock is |
| 1287 | possible. Connect to self case and simultaneous |
| 1288 | attempt to connect are eliminated by checking socket |
| 1289 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we |
| 1290 | check this before attempt to grab lock. |
| 1291 | |
| 1292 | Well, and we have to recheck the state after socket locked. |
| 1293 | */ |
| 1294 | st = sk->sk_state; |
| 1295 | |
| 1296 | switch (st) { |
| 1297 | case TCP_CLOSE: |
| 1298 | /* This is ok... continue with connect */ |
| 1299 | break; |
| 1300 | case TCP_ESTABLISHED: |
| 1301 | /* Socket is already connected */ |
| 1302 | err = -EISCONN; |
| 1303 | goto out_unlock; |
| 1304 | default: |
| 1305 | err = -EINVAL; |
| 1306 | goto out_unlock; |
| 1307 | } |
| 1308 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1309 | unix_state_lock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | |
| 1311 | if (sk->sk_state != st) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1312 | unix_state_unlock(sk); |
| 1313 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1314 | sock_put(other); |
| 1315 | goto restart; |
| 1316 | } |
| 1317 | |
David S. Miller | 3610cda | 2011-01-05 15:38:53 -0800 | [diff] [blame] | 1318 | err = security_unix_stream_connect(sk, other, newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1319 | if (err) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1320 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1321 | goto out_unlock; |
| 1322 | } |
| 1323 | |
| 1324 | /* The way is open! Fastly set all the necessary fields... */ |
| 1325 | |
| 1326 | sock_hold(sk); |
| 1327 | unix_peer(newsk) = sk; |
| 1328 | newsk->sk_state = TCP_ESTABLISHED; |
| 1329 | newsk->sk_type = sk->sk_type; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1330 | init_peercred(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | newu = unix_sk(newsk); |
Eric Dumazet | eaefd11 | 2011-02-18 03:26:36 +0000 | [diff] [blame] | 1332 | RCU_INIT_POINTER(newsk->sk_wq, &newu->peer_wq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1333 | otheru = unix_sk(other); |
| 1334 | |
| 1335 | /* copy address information from listening to new sock*/ |
| 1336 | if (otheru->addr) { |
| 1337 | atomic_inc(&otheru->addr->refcnt); |
| 1338 | newu->addr = otheru->addr; |
| 1339 | } |
Al Viro | 40ffe67 | 2012-03-14 21:54:32 -0400 | [diff] [blame] | 1340 | if (otheru->path.dentry) { |
| 1341 | path_get(&otheru->path); |
| 1342 | newu->path = otheru->path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1343 | } |
| 1344 | |
| 1345 | /* Set credentials */ |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1346 | copy_peercred(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1347 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | sock->state = SS_CONNECTED; |
| 1349 | sk->sk_state = TCP_ESTABLISHED; |
Benjamin LaHaise | 830a1e5 | 2005-12-13 23:22:32 -0800 | [diff] [blame] | 1350 | sock_hold(newsk); |
| 1351 | |
Peter Zijlstra | 4e857c5 | 2014-03-17 18:06:10 +0100 | [diff] [blame] | 1352 | smp_mb__after_atomic(); /* sock_hold() does an atomic_inc() */ |
Benjamin LaHaise | 830a1e5 | 2005-12-13 23:22:32 -0800 | [diff] [blame] | 1353 | unix_peer(sk) = newsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1355 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1356 | |
| 1357 | /* take ten and and send info to listening sock */ |
| 1358 | spin_lock(&other->sk_receive_queue.lock); |
| 1359 | __skb_queue_tail(&other->sk_receive_queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | spin_unlock(&other->sk_receive_queue.lock); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1361 | unix_state_unlock(other); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 1362 | other->sk_data_ready(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1363 | sock_put(other); |
| 1364 | return 0; |
| 1365 | |
| 1366 | out_unlock: |
| 1367 | if (other) |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1368 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | |
| 1370 | out: |
Wei Yongjun | 40d4444 | 2009-02-25 00:32:45 +0000 | [diff] [blame] | 1371 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | if (newsk) |
| 1373 | unix_release_sock(newsk, 0); |
| 1374 | if (other) |
| 1375 | sock_put(other); |
| 1376 | return err; |
| 1377 | } |
| 1378 | |
| 1379 | static int unix_socketpair(struct socket *socka, struct socket *sockb) |
| 1380 | { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1381 | struct sock *ska = socka->sk, *skb = sockb->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | |
| 1383 | /* Join our sockets back to back */ |
| 1384 | sock_hold(ska); |
| 1385 | sock_hold(skb); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1386 | unix_peer(ska) = skb; |
| 1387 | unix_peer(skb) = ska; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1388 | init_peercred(ska); |
| 1389 | init_peercred(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1390 | |
| 1391 | if (ska->sk_type != SOCK_DGRAM) { |
| 1392 | ska->sk_state = TCP_ESTABLISHED; |
| 1393 | skb->sk_state = TCP_ESTABLISHED; |
| 1394 | socka->state = SS_CONNECTED; |
| 1395 | sockb->state = SS_CONNECTED; |
| 1396 | } |
| 1397 | return 0; |
| 1398 | } |
| 1399 | |
Daniel Borkmann | 90c6bd3 | 2013-10-17 22:51:31 +0200 | [diff] [blame] | 1400 | static void unix_sock_inherit_flags(const struct socket *old, |
| 1401 | struct socket *new) |
| 1402 | { |
| 1403 | if (test_bit(SOCK_PASSCRED, &old->flags)) |
| 1404 | set_bit(SOCK_PASSCRED, &new->flags); |
| 1405 | if (test_bit(SOCK_PASSSEC, &old->flags)) |
| 1406 | set_bit(SOCK_PASSSEC, &new->flags); |
| 1407 | } |
| 1408 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1409 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) |
| 1410 | { |
| 1411 | struct sock *sk = sock->sk; |
| 1412 | struct sock *tsk; |
| 1413 | struct sk_buff *skb; |
| 1414 | int err; |
| 1415 | |
| 1416 | err = -EOPNOTSUPP; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1417 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1418 | goto out; |
| 1419 | |
| 1420 | err = -EINVAL; |
| 1421 | if (sk->sk_state != TCP_LISTEN) |
| 1422 | goto out; |
| 1423 | |
| 1424 | /* If socket state is TCP_LISTEN it cannot change (for now...), |
| 1425 | * so that no locks are necessary. |
| 1426 | */ |
| 1427 | |
| 1428 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); |
| 1429 | if (!skb) { |
| 1430 | /* This means receive shutdown. */ |
| 1431 | if (err == 0) |
| 1432 | err = -EINVAL; |
| 1433 | goto out; |
| 1434 | } |
| 1435 | |
| 1436 | tsk = skb->sk; |
| 1437 | skb_free_datagram(sk, skb); |
| 1438 | wake_up_interruptible(&unix_sk(sk)->peer_wait); |
| 1439 | |
| 1440 | /* attach accepted sock to socket */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1441 | unix_state_lock(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | newsock->state = SS_CONNECTED; |
Daniel Borkmann | 90c6bd3 | 2013-10-17 22:51:31 +0200 | [diff] [blame] | 1443 | unix_sock_inherit_flags(sock, newsock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1444 | sock_graft(tsk, newsock); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1445 | unix_state_unlock(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1446 | return 0; |
| 1447 | |
| 1448 | out: |
| 1449 | return err; |
| 1450 | } |
| 1451 | |
| 1452 | |
| 1453 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) |
| 1454 | { |
| 1455 | struct sock *sk = sock->sk; |
| 1456 | struct unix_sock *u; |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 1457 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, uaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | int err = 0; |
| 1459 | |
| 1460 | if (peer) { |
| 1461 | sk = unix_peer_get(sk); |
| 1462 | |
| 1463 | err = -ENOTCONN; |
| 1464 | if (!sk) |
| 1465 | goto out; |
| 1466 | err = 0; |
| 1467 | } else { |
| 1468 | sock_hold(sk); |
| 1469 | } |
| 1470 | |
| 1471 | u = unix_sk(sk); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1472 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | if (!u->addr) { |
| 1474 | sunaddr->sun_family = AF_UNIX; |
| 1475 | sunaddr->sun_path[0] = 0; |
| 1476 | *uaddr_len = sizeof(short); |
| 1477 | } else { |
| 1478 | struct unix_address *addr = u->addr; |
| 1479 | |
| 1480 | *uaddr_len = addr->len; |
| 1481 | memcpy(sunaddr, addr->name, *uaddr_len); |
| 1482 | } |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1483 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | sock_put(sk); |
| 1485 | out: |
| 1486 | return err; |
| 1487 | } |
| 1488 | |
| 1489 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) |
| 1490 | { |
| 1491 | int i; |
| 1492 | |
| 1493 | scm->fp = UNIXCB(skb).fp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1494 | UNIXCB(skb).fp = NULL; |
| 1495 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1496 | for (i = scm->fp->count-1; i >= 0; i--) |
Hannes Frederic Sowa | 415e3d3 | 2016-02-03 02:11:03 +0100 | [diff] [blame] | 1497 | unix_notinflight(scm->fp->user, scm->fp->fp[i]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1498 | } |
| 1499 | |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1500 | static void unix_destruct_scm(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1501 | { |
| 1502 | struct scm_cookie scm; |
| 1503 | memset(&scm, 0, sizeof(scm)); |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1504 | scm.pid = UNIXCB(skb).pid; |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1505 | if (UNIXCB(skb).fp) |
| 1506 | unix_detach_fds(&scm, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1507 | |
| 1508 | /* Alas, it calls VFS */ |
| 1509 | /* So fscking what? fput() had been SMP-safe since the last Summer */ |
| 1510 | scm_destroy(&scm); |
| 1511 | sock_wfree(skb); |
| 1512 | } |
| 1513 | |
willy tarreau | 712f4aa | 2016-01-10 07:54:56 +0100 | [diff] [blame] | 1514 | /* |
| 1515 | * The "user->unix_inflight" variable is protected by the garbage |
| 1516 | * collection lock, and we just read it locklessly here. If you go |
| 1517 | * over the limit, there might be a tiny race in actually noticing |
| 1518 | * it across threads. Tough. |
| 1519 | */ |
| 1520 | static inline bool too_many_unix_fds(struct task_struct *p) |
| 1521 | { |
| 1522 | struct user_struct *user = current_user(); |
| 1523 | |
| 1524 | if (unlikely(user->unix_inflight > task_rlimit(p, RLIMIT_NOFILE))) |
| 1525 | return !capable(CAP_SYS_RESOURCE) && !capable(CAP_SYS_ADMIN); |
| 1526 | return false; |
| 1527 | } |
| 1528 | |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1529 | #define MAX_RECURSION_LEVEL 4 |
| 1530 | |
Miklos Szeredi | 6209344 | 2008-11-09 15:23:57 +0100 | [diff] [blame] | 1531 | static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1532 | { |
| 1533 | int i; |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1534 | unsigned char max_level = 0; |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1535 | |
willy tarreau | 712f4aa | 2016-01-10 07:54:56 +0100 | [diff] [blame] | 1536 | if (too_many_unix_fds(current)) |
| 1537 | return -ETOOMANYREFS; |
| 1538 | |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1539 | for (i = scm->fp->count - 1; i >= 0; i--) { |
| 1540 | struct sock *sk = unix_get_socket(scm->fp->fp[i]); |
| 1541 | |
David Herrmann | 3575dbf | 2016-02-02 18:17:54 +0100 | [diff] [blame] | 1542 | if (sk) |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1543 | max_level = max(max_level, |
| 1544 | unix_sk(sk)->recursion_level); |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1545 | } |
| 1546 | if (unlikely(max_level > MAX_RECURSION_LEVEL)) |
| 1547 | return -ETOOMANYREFS; |
Miklos Szeredi | 6209344 | 2008-11-09 15:23:57 +0100 | [diff] [blame] | 1548 | |
| 1549 | /* |
| 1550 | * Need to duplicate file references for the sake of garbage |
| 1551 | * collection. Otherwise a socket in the fps might become a |
| 1552 | * candidate for GC while the skb is not yet queued. |
| 1553 | */ |
| 1554 | UNIXCB(skb).fp = scm_fp_dup(scm->fp); |
| 1555 | if (!UNIXCB(skb).fp) |
| 1556 | return -ENOMEM; |
| 1557 | |
willy tarreau | 712f4aa | 2016-01-10 07:54:56 +0100 | [diff] [blame] | 1558 | for (i = scm->fp->count - 1; i >= 0; i--) |
Hannes Frederic Sowa | 415e3d3 | 2016-02-03 02:11:03 +0100 | [diff] [blame] | 1559 | unix_inflight(scm->fp->user, scm->fp->fp[i]); |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1560 | return max_level; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1561 | } |
| 1562 | |
David S. Miller | f78a5fd | 2011-09-16 19:34:00 -0400 | [diff] [blame] | 1563 | static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds) |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1564 | { |
| 1565 | int err = 0; |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1566 | |
David S. Miller | f78a5fd | 2011-09-16 19:34:00 -0400 | [diff] [blame] | 1567 | UNIXCB(skb).pid = get_pid(scm->pid); |
Eric W. Biederman | 6b0ee8c0 | 2013-04-03 17:28:16 +0000 | [diff] [blame] | 1568 | UNIXCB(skb).uid = scm->creds.uid; |
| 1569 | UNIXCB(skb).gid = scm->creds.gid; |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1570 | UNIXCB(skb).fp = NULL; |
Stephen Smalley | 37a9a8d | 2015-06-10 08:44:59 -0400 | [diff] [blame] | 1571 | unix_get_secdata(scm, skb); |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1572 | if (scm->fp && send_fds) |
| 1573 | err = unix_attach_fds(scm, skb); |
| 1574 | |
| 1575 | skb->destructor = unix_destruct_scm; |
| 1576 | return err; |
| 1577 | } |
| 1578 | |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 1579 | static bool unix_passcred_enabled(const struct socket *sock, |
| 1580 | const struct sock *other) |
| 1581 | { |
| 1582 | return test_bit(SOCK_PASSCRED, &sock->flags) || |
| 1583 | !other->sk_socket || |
| 1584 | test_bit(SOCK_PASSCRED, &other->sk_socket->flags); |
| 1585 | } |
| 1586 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1587 | /* |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1588 | * Some apps rely on write() giving SCM_CREDENTIALS |
| 1589 | * We include credentials if source or destination socket |
| 1590 | * asserted SOCK_PASSCRED. |
| 1591 | */ |
| 1592 | static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock, |
| 1593 | const struct sock *other) |
| 1594 | { |
Eric W. Biederman | 6b0ee8c0 | 2013-04-03 17:28:16 +0000 | [diff] [blame] | 1595 | if (UNIXCB(skb).pid) |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1596 | return; |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 1597 | if (unix_passcred_enabled(sock, other)) { |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1598 | UNIXCB(skb).pid = get_pid(task_tgid(current)); |
David S. Miller | 6e0895c | 2013-04-22 20:32:51 -0400 | [diff] [blame] | 1599 | current_uid_gid(&UNIXCB(skb).uid, &UNIXCB(skb).gid); |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1600 | } |
| 1601 | } |
| 1602 | |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 1603 | static int maybe_init_creds(struct scm_cookie *scm, |
| 1604 | struct socket *socket, |
| 1605 | const struct sock *other) |
| 1606 | { |
| 1607 | int err; |
| 1608 | struct msghdr msg = { .msg_controllen = 0 }; |
| 1609 | |
| 1610 | err = scm_send(socket, &msg, scm, false); |
| 1611 | if (err) |
| 1612 | return err; |
| 1613 | |
| 1614 | if (unix_passcred_enabled(socket, other)) { |
| 1615 | scm->pid = get_pid(task_tgid(current)); |
| 1616 | current_uid_gid(&scm->creds.uid, &scm->creds.gid); |
| 1617 | } |
| 1618 | return err; |
| 1619 | } |
| 1620 | |
| 1621 | static bool unix_skb_scm_eq(struct sk_buff *skb, |
| 1622 | struct scm_cookie *scm) |
| 1623 | { |
| 1624 | const struct unix_skb_parms *u = &UNIXCB(skb); |
| 1625 | |
| 1626 | return u->pid == scm->pid && |
| 1627 | uid_eq(u->uid, scm->creds.uid) && |
| 1628 | gid_eq(u->gid, scm->creds.gid) && |
| 1629 | unix_secdata_eq(scm, skb); |
| 1630 | } |
| 1631 | |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1632 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1633 | * Send AF_UNIX data. |
| 1634 | */ |
| 1635 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1636 | static int unix_dgram_sendmsg(struct socket *sock, struct msghdr *msg, |
| 1637 | size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1638 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1640 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | struct unix_sock *u = unix_sk(sk); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 1642 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, msg->msg_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | struct sock *other = NULL; |
| 1644 | int namelen = 0; /* fake GCC */ |
| 1645 | int err; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 1646 | unsigned int hash; |
David S. Miller | f78a5fd | 2011-09-16 19:34:00 -0400 | [diff] [blame] | 1647 | struct sk_buff *skb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1648 | long timeo; |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1649 | struct scm_cookie scm; |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1650 | int max_level; |
Eric Dumazet | eb6a248 | 2012-04-03 05:28:28 +0000 | [diff] [blame] | 1651 | int data_len = 0; |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1652 | int sk_locked; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | |
dann frazier | 5f23b73 | 2008-11-26 15:32:27 -0800 | [diff] [blame] | 1654 | wait_for_unix_gc(); |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1655 | err = scm_send(sock, msg, &scm, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | if (err < 0) |
| 1657 | return err; |
| 1658 | |
| 1659 | err = -EOPNOTSUPP; |
| 1660 | if (msg->msg_flags&MSG_OOB) |
| 1661 | goto out; |
| 1662 | |
| 1663 | if (msg->msg_namelen) { |
| 1664 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); |
| 1665 | if (err < 0) |
| 1666 | goto out; |
| 1667 | namelen = err; |
| 1668 | } else { |
| 1669 | sunaddr = NULL; |
| 1670 | err = -ENOTCONN; |
| 1671 | other = unix_peer_get(sk); |
| 1672 | if (!other) |
| 1673 | goto out; |
| 1674 | } |
| 1675 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1676 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr |
| 1677 | && (err = unix_autobind(sock)) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | goto out; |
| 1679 | |
| 1680 | err = -EMSGSIZE; |
| 1681 | if (len > sk->sk_sndbuf - 32) |
| 1682 | goto out; |
| 1683 | |
Kirill Tkhai | 31ff6aa | 2014-05-15 19:56:28 +0400 | [diff] [blame] | 1684 | if (len > SKB_MAX_ALLOC) { |
Eric Dumazet | eb6a248 | 2012-04-03 05:28:28 +0000 | [diff] [blame] | 1685 | data_len = min_t(size_t, |
| 1686 | len - SKB_MAX_ALLOC, |
| 1687 | MAX_SKB_FRAGS * PAGE_SIZE); |
Kirill Tkhai | 31ff6aa | 2014-05-15 19:56:28 +0400 | [diff] [blame] | 1688 | data_len = PAGE_ALIGN(data_len); |
| 1689 | |
| 1690 | BUILD_BUG_ON(SKB_MAX_ALLOC < PAGE_SIZE); |
| 1691 | } |
Eric Dumazet | eb6a248 | 2012-04-03 05:28:28 +0000 | [diff] [blame] | 1692 | |
| 1693 | skb = sock_alloc_send_pskb(sk, len - data_len, data_len, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1694 | msg->msg_flags & MSG_DONTWAIT, &err, |
| 1695 | PAGE_ALLOC_COSTLY_ORDER); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1696 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | goto out; |
| 1698 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1699 | err = unix_scm_to_skb(&scm, skb, true); |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1700 | if (err < 0) |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1701 | goto out_free; |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1702 | max_level = err + 1; |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 1703 | |
Eric Dumazet | eb6a248 | 2012-04-03 05:28:28 +0000 | [diff] [blame] | 1704 | skb_put(skb, len - data_len); |
| 1705 | skb->data_len = data_len; |
| 1706 | skb->len = len; |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 1707 | err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | if (err) |
| 1709 | goto out_free; |
| 1710 | |
| 1711 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
| 1712 | |
| 1713 | restart: |
| 1714 | if (!other) { |
| 1715 | err = -ECONNRESET; |
| 1716 | if (sunaddr == NULL) |
| 1717 | goto out_free; |
| 1718 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 1719 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1720 | hash, &err); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1721 | if (other == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1722 | goto out_free; |
| 1723 | } |
| 1724 | |
Alban Crequy | d6ae3ba | 2011-01-18 06:39:15 +0000 | [diff] [blame] | 1725 | if (sk_filter(other, skb) < 0) { |
| 1726 | /* Toss the packet but do not return any error to the sender */ |
| 1727 | err = len; |
| 1728 | goto out_free; |
| 1729 | } |
| 1730 | |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1731 | sk_locked = 0; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1732 | unix_state_lock(other); |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1733 | restart_locked: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1734 | err = -EPERM; |
| 1735 | if (!unix_may_send(sk, other)) |
| 1736 | goto out_unlock; |
| 1737 | |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1738 | if (unlikely(sock_flag(other, SOCK_DEAD))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1739 | /* |
| 1740 | * Check with 1003.1g - what should |
| 1741 | * datagram error |
| 1742 | */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1743 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1744 | sock_put(other); |
| 1745 | |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1746 | if (!sk_locked) |
| 1747 | unix_state_lock(sk); |
| 1748 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1749 | err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1750 | if (unix_peer(sk) == other) { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1751 | unix_peer(sk) = NULL; |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1752 | unix_dgram_peer_wake_disconnect_wakeup(sk, other); |
| 1753 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1754 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | |
| 1756 | unix_dgram_disconnected(sk, other); |
| 1757 | sock_put(other); |
| 1758 | err = -ECONNREFUSED; |
| 1759 | } else { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1760 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1761 | } |
| 1762 | |
| 1763 | other = NULL; |
| 1764 | if (err) |
| 1765 | goto out_free; |
| 1766 | goto restart; |
| 1767 | } |
| 1768 | |
| 1769 | err = -EPIPE; |
| 1770 | if (other->sk_shutdown & RCV_SHUTDOWN) |
| 1771 | goto out_unlock; |
| 1772 | |
| 1773 | if (sk->sk_type != SOCK_SEQPACKET) { |
| 1774 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); |
| 1775 | if (err) |
| 1776 | goto out_unlock; |
| 1777 | } |
| 1778 | |
Rainer Weikusat | a5527dd | 2016-02-11 19:37:27 +0000 | [diff] [blame] | 1779 | /* other == sk && unix_peer(other) != sk if |
| 1780 | * - unix_peer(sk) == NULL, destination address bound to sk |
| 1781 | * - unix_peer(sk) == sk by time of get but disconnected before lock |
| 1782 | */ |
| 1783 | if (other != sk && |
| 1784 | unlikely(unix_peer(other) != sk && unix_recvq_full(other))) { |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1785 | if (timeo) { |
| 1786 | timeo = unix_wait_for_peer(other, timeo); |
| 1787 | |
| 1788 | err = sock_intr_errno(timeo); |
| 1789 | if (signal_pending(current)) |
| 1790 | goto out_free; |
| 1791 | |
| 1792 | goto restart; |
| 1793 | } |
| 1794 | |
| 1795 | if (!sk_locked) { |
| 1796 | unix_state_unlock(other); |
| 1797 | unix_state_double_lock(sk, other); |
| 1798 | } |
| 1799 | |
| 1800 | if (unix_peer(sk) != other || |
| 1801 | unix_dgram_peer_wake_me(sk, other)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1802 | err = -EAGAIN; |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1803 | sk_locked = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1804 | goto out_unlock; |
| 1805 | } |
| 1806 | |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1807 | if (!sk_locked) { |
| 1808 | sk_locked = 1; |
| 1809 | goto restart_locked; |
| 1810 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1811 | } |
| 1812 | |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1813 | if (unlikely(sk_locked)) |
| 1814 | unix_state_unlock(sk); |
| 1815 | |
Alban Crequy | 3f66116 | 2010-10-04 08:48:28 +0000 | [diff] [blame] | 1816 | if (sock_flag(other, SOCK_RCVTSTAMP)) |
| 1817 | __net_timestamp(skb); |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1818 | maybe_add_creds(skb, sock, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | skb_queue_tail(&other->sk_receive_queue, skb); |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1820 | if (max_level > unix_sk(other)->recursion_level) |
| 1821 | unix_sk(other)->recursion_level = max_level; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1822 | unix_state_unlock(other); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 1823 | other->sk_data_ready(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1824 | sock_put(other); |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1825 | scm_destroy(&scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1826 | return len; |
| 1827 | |
| 1828 | out_unlock: |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 1829 | if (sk_locked) |
| 1830 | unix_state_unlock(sk); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1831 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1832 | out_free: |
| 1833 | kfree_skb(skb); |
| 1834 | out: |
| 1835 | if (other) |
| 1836 | sock_put(other); |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1837 | scm_destroy(&scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | return err; |
| 1839 | } |
| 1840 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1841 | /* We use paged skbs for stream sockets, and limit occupancy to 32768 |
| 1842 | * bytes, and a minimun of a full page. |
| 1843 | */ |
| 1844 | #define UNIX_SKB_FRAGS_SZ (PAGE_SIZE << get_order(32768)) |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1845 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 1846 | static int unix_stream_sendmsg(struct socket *sock, struct msghdr *msg, |
| 1847 | size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1848 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1849 | struct sock *sk = sock->sk; |
| 1850 | struct sock *other = NULL; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1851 | int err, size; |
David S. Miller | f78a5fd | 2011-09-16 19:34:00 -0400 | [diff] [blame] | 1852 | struct sk_buff *skb; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1853 | int sent = 0; |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1854 | struct scm_cookie scm; |
Miklos Szeredi | 8ba69ba | 2009-09-11 11:31:45 -0700 | [diff] [blame] | 1855 | bool fds_sent = false; |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1856 | int max_level; |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1857 | int data_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1858 | |
dann frazier | 5f23b73 | 2008-11-26 15:32:27 -0800 | [diff] [blame] | 1859 | wait_for_unix_gc(); |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1860 | err = scm_send(sock, msg, &scm, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | if (err < 0) |
| 1862 | return err; |
| 1863 | |
| 1864 | err = -EOPNOTSUPP; |
| 1865 | if (msg->msg_flags&MSG_OOB) |
| 1866 | goto out_err; |
| 1867 | |
| 1868 | if (msg->msg_namelen) { |
| 1869 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; |
| 1870 | goto out_err; |
| 1871 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | err = -ENOTCONN; |
Benjamin LaHaise | 830a1e5 | 2005-12-13 23:22:32 -0800 | [diff] [blame] | 1873 | other = unix_peer(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1874 | if (!other) |
| 1875 | goto out_err; |
| 1876 | } |
| 1877 | |
| 1878 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1879 | goto pipe_err; |
| 1880 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1881 | while (sent < len) { |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1882 | size = len - sent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | |
| 1884 | /* Keep two messages in the pipe so it schedules better */ |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1885 | size = min_t(int, size, (sk->sk_sndbuf >> 1) - 64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1887 | /* allow fallback to order-0 allocations */ |
| 1888 | size = min_t(int, size, SKB_MAX_HEAD(0) + UNIX_SKB_FRAGS_SZ); |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1889 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1890 | data_len = max_t(int, 0, size - SKB_MAX_HEAD(0)); |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1891 | |
Kirill Tkhai | 31ff6aa | 2014-05-15 19:56:28 +0400 | [diff] [blame] | 1892 | data_len = min_t(size_t, size, PAGE_ALIGN(data_len)); |
| 1893 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1894 | skb = sock_alloc_send_pskb(sk, size - data_len, data_len, |
Eric Dumazet | 28d6427 | 2013-08-08 14:38:47 -0700 | [diff] [blame] | 1895 | msg->msg_flags & MSG_DONTWAIT, &err, |
| 1896 | get_order(UNIX_SKB_FRAGS_SZ)); |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1897 | if (!skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1898 | goto out_err; |
| 1899 | |
David S. Miller | f78a5fd | 2011-09-16 19:34:00 -0400 | [diff] [blame] | 1900 | /* Only send the fds in the first buffer */ |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1901 | err = unix_scm_to_skb(&scm, skb, !fds_sent); |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1902 | if (err < 0) { |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1903 | kfree_skb(skb); |
David S. Miller | f78a5fd | 2011-09-16 19:34:00 -0400 | [diff] [blame] | 1904 | goto out_err; |
Miklos Szeredi | 6209344 | 2008-11-09 15:23:57 +0100 | [diff] [blame] | 1905 | } |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1906 | max_level = err + 1; |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1907 | fds_sent = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 1909 | skb_put(skb, size - data_len); |
| 1910 | skb->data_len = data_len; |
| 1911 | skb->len = size; |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 1912 | err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, size); |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1913 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | kfree_skb(skb); |
David S. Miller | f78a5fd | 2011-09-16 19:34:00 -0400 | [diff] [blame] | 1915 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1916 | } |
| 1917 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1918 | unix_state_lock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | |
| 1920 | if (sock_flag(other, SOCK_DEAD) || |
| 1921 | (other->sk_shutdown & RCV_SHUTDOWN)) |
| 1922 | goto pipe_err_free; |
| 1923 | |
Eric Dumazet | 16e5726 | 2011-09-19 05:52:27 +0000 | [diff] [blame] | 1924 | maybe_add_creds(skb, sock, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | skb_queue_tail(&other->sk_receive_queue, skb); |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 1926 | if (max_level > unix_sk(other)->recursion_level) |
| 1927 | unix_sk(other)->recursion_level = max_level; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1928 | unix_state_unlock(other); |
David S. Miller | 676d236 | 2014-04-11 16:15:36 -0400 | [diff] [blame] | 1929 | other->sk_data_ready(other); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1930 | sent += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1931 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1933 | scm_destroy(&scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1934 | |
| 1935 | return sent; |
| 1936 | |
| 1937 | pipe_err_free: |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1938 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1939 | kfree_skb(skb); |
| 1940 | pipe_err: |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1941 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) |
| 1942 | send_sig(SIGPIPE, current, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1943 | err = -EPIPE; |
| 1944 | out_err: |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 1945 | scm_destroy(&scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1946 | return sent ? : err; |
| 1947 | } |
| 1948 | |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1949 | static ssize_t unix_stream_sendpage(struct socket *socket, struct page *page, |
| 1950 | int offset, size_t size, int flags) |
| 1951 | { |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 1952 | int err; |
| 1953 | bool send_sigpipe = false; |
| 1954 | bool init_scm = true; |
| 1955 | struct scm_cookie scm; |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1956 | struct sock *other, *sk = socket->sk; |
| 1957 | struct sk_buff *skb, *newskb = NULL, *tail = NULL; |
| 1958 | |
| 1959 | if (flags & MSG_OOB) |
| 1960 | return -EOPNOTSUPP; |
| 1961 | |
| 1962 | other = unix_peer(sk); |
| 1963 | if (!other || sk->sk_state != TCP_ESTABLISHED) |
| 1964 | return -ENOTCONN; |
| 1965 | |
| 1966 | if (false) { |
| 1967 | alloc_skb: |
| 1968 | unix_state_unlock(other); |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 1969 | mutex_unlock(&unix_sk(other)->iolock); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1970 | newskb = sock_alloc_send_pskb(sk, 0, 0, flags & MSG_DONTWAIT, |
| 1971 | &err, 0); |
| 1972 | if (!newskb) |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 1973 | goto err; |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1974 | } |
| 1975 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 1976 | /* we must acquire iolock as we modify already present |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1977 | * skbs in the sk_receive_queue and mess with skb->len |
| 1978 | */ |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 1979 | err = mutex_lock_interruptible(&unix_sk(other)->iolock); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1980 | if (err) { |
| 1981 | err = flags & MSG_DONTWAIT ? -EAGAIN : -ERESTARTSYS; |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1982 | goto err; |
| 1983 | } |
| 1984 | |
| 1985 | if (sk->sk_shutdown & SEND_SHUTDOWN) { |
| 1986 | err = -EPIPE; |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 1987 | send_sigpipe = true; |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1988 | goto err_unlock; |
| 1989 | } |
| 1990 | |
| 1991 | unix_state_lock(other); |
| 1992 | |
| 1993 | if (sock_flag(other, SOCK_DEAD) || |
| 1994 | other->sk_shutdown & RCV_SHUTDOWN) { |
| 1995 | err = -EPIPE; |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 1996 | send_sigpipe = true; |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 1997 | goto err_state_unlock; |
| 1998 | } |
| 1999 | |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2000 | if (init_scm) { |
| 2001 | err = maybe_init_creds(&scm, socket, other); |
| 2002 | if (err) |
| 2003 | goto err_state_unlock; |
| 2004 | init_scm = false; |
| 2005 | } |
| 2006 | |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2007 | skb = skb_peek_tail(&other->sk_receive_queue); |
| 2008 | if (tail && tail == skb) { |
| 2009 | skb = newskb; |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2010 | } else if (!skb || !unix_skb_scm_eq(skb, &scm)) { |
| 2011 | if (newskb) { |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2012 | skb = newskb; |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2013 | } else { |
| 2014 | tail = skb; |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2015 | goto alloc_skb; |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2016 | } |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2017 | } else if (newskb) { |
| 2018 | /* this is fast path, we don't necessarily need to |
| 2019 | * call to kfree_skb even though with newskb == NULL |
| 2020 | * this - does no harm |
| 2021 | */ |
| 2022 | consume_skb(newskb); |
Hannes Frederic Sowa | 8844f97 | 2015-11-16 16:25:56 +0100 | [diff] [blame] | 2023 | newskb = NULL; |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2024 | } |
| 2025 | |
| 2026 | if (skb_append_pagefrags(skb, page, offset, size)) { |
| 2027 | tail = skb; |
| 2028 | goto alloc_skb; |
| 2029 | } |
| 2030 | |
| 2031 | skb->len += size; |
| 2032 | skb->data_len += size; |
| 2033 | skb->truesize += size; |
| 2034 | atomic_add(size, &sk->sk_wmem_alloc); |
| 2035 | |
Hannes Frederic Sowa | a3a116e | 2015-11-17 15:10:59 +0100 | [diff] [blame] | 2036 | if (newskb) { |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2037 | err = unix_scm_to_skb(&scm, skb, false); |
| 2038 | if (err) |
| 2039 | goto err_state_unlock; |
Hannes Frederic Sowa | a3a116e | 2015-11-17 15:10:59 +0100 | [diff] [blame] | 2040 | spin_lock(&other->sk_receive_queue.lock); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2041 | __skb_queue_tail(&other->sk_receive_queue, newskb); |
Hannes Frederic Sowa | a3a116e | 2015-11-17 15:10:59 +0100 | [diff] [blame] | 2042 | spin_unlock(&other->sk_receive_queue.lock); |
| 2043 | } |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2044 | |
| 2045 | unix_state_unlock(other); |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2046 | mutex_unlock(&unix_sk(other)->iolock); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2047 | |
| 2048 | other->sk_data_ready(other); |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2049 | scm_destroy(&scm); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2050 | return size; |
| 2051 | |
| 2052 | err_state_unlock: |
| 2053 | unix_state_unlock(other); |
| 2054 | err_unlock: |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2055 | mutex_unlock(&unix_sk(other)->iolock); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2056 | err: |
| 2057 | kfree_skb(newskb); |
| 2058 | if (send_sigpipe && !(flags & MSG_NOSIGNAL)) |
| 2059 | send_sig(SIGPIPE, current, 0); |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2060 | if (!init_scm) |
| 2061 | scm_destroy(&scm); |
Hannes Frederic Sowa | 869e7c6 | 2015-05-21 16:59:59 +0200 | [diff] [blame] | 2062 | return err; |
| 2063 | } |
| 2064 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2065 | static int unix_seqpacket_sendmsg(struct socket *sock, struct msghdr *msg, |
| 2066 | size_t len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2067 | { |
| 2068 | int err; |
| 2069 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2070 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2071 | err = sock_error(sk); |
| 2072 | if (err) |
| 2073 | return err; |
| 2074 | |
| 2075 | if (sk->sk_state != TCP_ESTABLISHED) |
| 2076 | return -ENOTCONN; |
| 2077 | |
| 2078 | if (msg->msg_namelen) |
| 2079 | msg->msg_namelen = 0; |
| 2080 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2081 | return unix_dgram_sendmsg(sock, msg, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2082 | } |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2083 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2084 | static int unix_seqpacket_recvmsg(struct socket *sock, struct msghdr *msg, |
| 2085 | size_t size, int flags) |
Eric W. Biederman | a05d2ad | 2011-04-24 01:54:57 +0000 | [diff] [blame] | 2086 | { |
| 2087 | struct sock *sk = sock->sk; |
| 2088 | |
| 2089 | if (sk->sk_state != TCP_ESTABLISHED) |
| 2090 | return -ENOTCONN; |
| 2091 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2092 | return unix_dgram_recvmsg(sock, msg, size, flags); |
Eric W. Biederman | a05d2ad | 2011-04-24 01:54:57 +0000 | [diff] [blame] | 2093 | } |
| 2094 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2095 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
| 2096 | { |
| 2097 | struct unix_sock *u = unix_sk(sk); |
| 2098 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2099 | if (u->addr) { |
| 2100 | msg->msg_namelen = u->addr->len; |
| 2101 | memcpy(msg->msg_name, u->addr->name, u->addr->len); |
| 2102 | } |
| 2103 | } |
| 2104 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 2105 | static int unix_dgram_recvmsg(struct socket *sock, struct msghdr *msg, |
| 2106 | size_t size, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2107 | { |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2108 | struct scm_cookie scm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | struct sock *sk = sock->sk; |
| 2110 | struct unix_sock *u = unix_sk(sk); |
Rainer Weikusat | 6487428 | 2015-12-06 21:11:38 +0000 | [diff] [blame] | 2111 | struct sk_buff *skb, *last; |
| 2112 | long timeo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2113 | int err; |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 2114 | int peeked, skip; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2115 | |
| 2116 | err = -EOPNOTSUPP; |
| 2117 | if (flags&MSG_OOB) |
| 2118 | goto out; |
| 2119 | |
Rainer Weikusat | 6487428 | 2015-12-06 21:11:38 +0000 | [diff] [blame] | 2120 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2121 | |
Rainer Weikusat | 6487428 | 2015-12-06 21:11:38 +0000 | [diff] [blame] | 2122 | do { |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2123 | mutex_lock(&u->iolock); |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 2124 | |
Rainer Weikusat | 6487428 | 2015-12-06 21:11:38 +0000 | [diff] [blame] | 2125 | skip = sk_peek_offset(sk, flags); |
| 2126 | skb = __skb_try_recv_datagram(sk, flags, &peeked, &skip, &err, |
| 2127 | &last); |
| 2128 | if (skb) |
| 2129 | break; |
| 2130 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2131 | mutex_unlock(&u->iolock); |
Rainer Weikusat | 6487428 | 2015-12-06 21:11:38 +0000 | [diff] [blame] | 2132 | |
| 2133 | if (err != -EAGAIN) |
| 2134 | break; |
| 2135 | } while (timeo && |
| 2136 | !__skb_wait_for_more_packets(sk, &err, &timeo, last)); |
| 2137 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2138 | if (!skb) { /* implies iolock unlocked */ |
Florian Zumbiehl | 0a11225 | 2007-11-29 23:19:23 +1100 | [diff] [blame] | 2139 | unix_state_lock(sk); |
| 2140 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ |
| 2141 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && |
| 2142 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 2143 | err = 0; |
| 2144 | unix_state_unlock(sk); |
Rainer Weikusat | 6487428 | 2015-12-06 21:11:38 +0000 | [diff] [blame] | 2145 | goto out; |
Florian Zumbiehl | 0a11225 | 2007-11-29 23:19:23 +1100 | [diff] [blame] | 2146 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2147 | |
Rainer Weikusat | 77b75f4 | 2015-11-26 19:23:15 +0000 | [diff] [blame] | 2148 | if (wq_has_sleeper(&u->peer_wait)) |
| 2149 | wake_up_interruptible_sync_poll(&u->peer_wait, |
| 2150 | POLLOUT | POLLWRNORM | |
| 2151 | POLLWRBAND); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | |
| 2153 | if (msg->msg_name) |
| 2154 | unix_copy_addr(msg, skb->sk); |
| 2155 | |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 2156 | if (size > skb->len - skip) |
| 2157 | size = skb->len - skip; |
| 2158 | else if (size < skb->len - skip) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2159 | msg->msg_flags |= MSG_TRUNC; |
| 2160 | |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 2161 | err = skb_copy_datagram_msg(skb, skip, msg, size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2162 | if (err) |
| 2163 | goto out_free; |
| 2164 | |
Alban Crequy | 3f66116 | 2010-10-04 08:48:28 +0000 | [diff] [blame] | 2165 | if (sock_flag(sk, SOCK_RCVTSTAMP)) |
| 2166 | __sock_recv_timestamp(msg, sk, skb); |
| 2167 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2168 | memset(&scm, 0, sizeof(scm)); |
| 2169 | |
| 2170 | scm_set_cred(&scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid); |
| 2171 | unix_set_secdata(&scm, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2172 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2173 | if (!(flags & MSG_PEEK)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2174 | if (UNIXCB(skb).fp) |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2175 | unix_detach_fds(&scm, skb); |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 2176 | |
| 2177 | sk_peek_offset_bwd(sk, skb->len); |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2178 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | /* It is questionable: on PEEK we could: |
| 2180 | - do not return fds - good, but too simple 8) |
| 2181 | - return fds, and do not return them on read (old strategy, |
| 2182 | apparently wrong) |
| 2183 | - clone fds (I chose it for now, it is the most universal |
| 2184 | solution) |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2185 | |
| 2186 | POSIX 1003.1g does not actually define this clearly |
| 2187 | at all. POSIX 1003.1g doesn't define a lot of things |
| 2188 | clearly however! |
| 2189 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | */ |
Pavel Emelyanov | f55bb7f | 2012-02-21 07:31:51 +0000 | [diff] [blame] | 2191 | |
| 2192 | sk_peek_offset_fwd(sk, size); |
| 2193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2194 | if (UNIXCB(skb).fp) |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2195 | scm.fp = scm_fp_dup(UNIXCB(skb).fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | } |
Eric Dumazet | 9f6f9af | 2012-02-21 23:24:55 +0000 | [diff] [blame] | 2197 | err = (flags & MSG_TRUNC) ? skb->len - skip : size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2198 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2199 | scm_recv(sock, msg, &scm, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2200 | |
| 2201 | out_free: |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2202 | skb_free_datagram(sk, skb); |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2203 | mutex_unlock(&u->iolock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2204 | out: |
| 2205 | return err; |
| 2206 | } |
| 2207 | |
| 2208 | /* |
Benjamin Poirier | 79f632c | 2013-04-29 11:42:14 +0000 | [diff] [blame] | 2209 | * Sleep until more data has arrived. But check for races.. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2210 | */ |
Benjamin Poirier | 79f632c | 2013-04-29 11:42:14 +0000 | [diff] [blame] | 2211 | static long unix_stream_data_wait(struct sock *sk, long timeo, |
WANG Cong | 06a77b0 | 2016-11-17 15:55:26 -0800 | [diff] [blame] | 2212 | struct sk_buff *last, unsigned int last_len, |
| 2213 | bool freezable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2214 | { |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2215 | struct sk_buff *tail; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2216 | DEFINE_WAIT(wait); |
| 2217 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2218 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2219 | |
| 2220 | for (;;) { |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2221 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2222 | |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2223 | tail = skb_peek_tail(&sk->sk_receive_queue); |
| 2224 | if (tail != last || |
| 2225 | (tail && tail->len != last_len) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2226 | sk->sk_err || |
| 2227 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 2228 | signal_pending(current) || |
| 2229 | !timeo) |
| 2230 | break; |
| 2231 | |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2232 | sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2233 | unix_state_unlock(sk); |
WANG Cong | 06a77b0 | 2016-11-17 15:55:26 -0800 | [diff] [blame] | 2234 | if (freezable) |
| 2235 | timeo = freezable_schedule_timeout(timeo); |
| 2236 | else |
| 2237 | timeo = schedule_timeout(timeo); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2238 | unix_state_lock(sk); |
Mark Salyzyn | b48732e | 2015-05-26 08:22:19 -0700 | [diff] [blame] | 2239 | |
| 2240 | if (sock_flag(sk, SOCK_DEAD)) |
| 2241 | break; |
| 2242 | |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2243 | sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | } |
| 2245 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2246 | finish_wait(sk_sleep(sk), &wait); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2247 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2248 | return timeo; |
| 2249 | } |
| 2250 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 2251 | static unsigned int unix_skb_len(const struct sk_buff *skb) |
| 2252 | { |
| 2253 | return skb->len - UNIXCB(skb).consumed; |
| 2254 | } |
| 2255 | |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2256 | struct unix_stream_read_state { |
| 2257 | int (*recv_actor)(struct sk_buff *, int, int, |
| 2258 | struct unix_stream_read_state *); |
| 2259 | struct socket *socket; |
| 2260 | struct msghdr *msg; |
| 2261 | struct pipe_inode_info *pipe; |
| 2262 | size_t size; |
| 2263 | int flags; |
| 2264 | unsigned int splice_flags; |
| 2265 | }; |
| 2266 | |
WANG Cong | 06a77b0 | 2016-11-17 15:55:26 -0800 | [diff] [blame] | 2267 | static int unix_stream_read_generic(struct unix_stream_read_state *state, |
| 2268 | bool freezable) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2269 | { |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2270 | struct scm_cookie scm; |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2271 | struct socket *sock = state->socket; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2272 | struct sock *sk = sock->sk; |
| 2273 | struct unix_sock *u = unix_sk(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2274 | int copied = 0; |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2275 | int flags = state->flags; |
Eric Dumazet | de14439 | 2014-03-25 18:42:27 -0700 | [diff] [blame] | 2276 | int noblock = flags & MSG_DONTWAIT; |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2277 | bool check_creds = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2278 | int target; |
| 2279 | int err = 0; |
| 2280 | long timeo; |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 2281 | int skip; |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2282 | size_t size = state->size; |
| 2283 | unsigned int last_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | |
Rainer Weikusat | 1b92ee3 | 2016-02-08 18:47:19 +0000 | [diff] [blame] | 2285 | if (unlikely(sk->sk_state != TCP_ESTABLISHED)) { |
| 2286 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2287 | goto out; |
Rainer Weikusat | 1b92ee3 | 2016-02-08 18:47:19 +0000 | [diff] [blame] | 2288 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2289 | |
Rainer Weikusat | 1b92ee3 | 2016-02-08 18:47:19 +0000 | [diff] [blame] | 2290 | if (unlikely(flags & MSG_OOB)) { |
| 2291 | err = -EOPNOTSUPP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2292 | goto out; |
Rainer Weikusat | 1b92ee3 | 2016-02-08 18:47:19 +0000 | [diff] [blame] | 2293 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2294 | |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2295 | target = sock_rcvlowat(sk, flags & MSG_WAITALL, size); |
Eric Dumazet | de14439 | 2014-03-25 18:42:27 -0700 | [diff] [blame] | 2296 | timeo = sock_rcvtimeo(sk, noblock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2297 | |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2298 | memset(&scm, 0, sizeof(scm)); |
| 2299 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | /* Lock the socket to prevent queue disordering |
| 2301 | * while sleeps in memcpy_tomsg |
| 2302 | */ |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2303 | mutex_lock(&u->iolock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | |
Andrey Vagin | e9193d6 | 2015-10-02 00:05:36 +0300 | [diff] [blame] | 2305 | if (flags & MSG_PEEK) |
| 2306 | skip = sk_peek_offset(sk, flags); |
| 2307 | else |
| 2308 | skip = 0; |
| 2309 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2310 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2311 | int chunk; |
Hannes Frederic Sowa | 73ed5d2 | 2015-11-10 16:23:15 +0100 | [diff] [blame] | 2312 | bool drop_skb; |
Benjamin Poirier | 79f632c | 2013-04-29 11:42:14 +0000 | [diff] [blame] | 2313 | struct sk_buff *skb, *last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2314 | |
Rainer Weikusat | 18eceb8 | 2016-02-18 12:39:46 +0000 | [diff] [blame] | 2315 | redo: |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 2316 | unix_state_lock(sk); |
Mark Salyzyn | b48732e | 2015-05-26 08:22:19 -0700 | [diff] [blame] | 2317 | if (sock_flag(sk, SOCK_DEAD)) { |
| 2318 | err = -ECONNRESET; |
| 2319 | goto unlock; |
| 2320 | } |
Benjamin Poirier | 79f632c | 2013-04-29 11:42:14 +0000 | [diff] [blame] | 2321 | last = skb = skb_peek(&sk->sk_receive_queue); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2322 | last_len = last ? last->len : 0; |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 2323 | again: |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2324 | if (skb == NULL) { |
Eric Dumazet | 25888e3 | 2010-11-25 04:11:39 +0000 | [diff] [blame] | 2325 | unix_sk(sk)->recursion_level = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2326 | if (copied >= target) |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 2327 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2328 | |
| 2329 | /* |
| 2330 | * POSIX 1003.1g mandates this order. |
| 2331 | */ |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2332 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2333 | err = sock_error(sk); |
| 2334 | if (err) |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 2335 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2336 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 2337 | goto unlock; |
| 2338 | |
| 2339 | unix_state_unlock(sk); |
Rainer Weikusat | 1b92ee3 | 2016-02-08 18:47:19 +0000 | [diff] [blame] | 2340 | if (!timeo) { |
| 2341 | err = -EAGAIN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2342 | break; |
Rainer Weikusat | 1b92ee3 | 2016-02-08 18:47:19 +0000 | [diff] [blame] | 2343 | } |
| 2344 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2345 | mutex_unlock(&u->iolock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2346 | |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2347 | timeo = unix_stream_data_wait(sk, timeo, last, |
WANG Cong | 06a77b0 | 2016-11-17 15:55:26 -0800 | [diff] [blame] | 2348 | last_len, freezable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2349 | |
Rainer Weikusat | 3822b5c | 2015-12-16 20:09:25 +0000 | [diff] [blame] | 2350 | if (signal_pending(current)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2351 | err = sock_intr_errno(timeo); |
Eric Dumazet | fa0dc04 | 2016-01-24 13:53:50 -0800 | [diff] [blame] | 2352 | scm_destroy(&scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2353 | goto out; |
| 2354 | } |
Rainer Weikusat | b3ca9b0 | 2011-02-28 04:50:55 +0000 | [diff] [blame] | 2355 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2356 | mutex_lock(&u->iolock); |
Rainer Weikusat | 18eceb8 | 2016-02-18 12:39:46 +0000 | [diff] [blame] | 2357 | goto redo; |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2358 | unlock: |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 2359 | unix_state_unlock(sk); |
| 2360 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2361 | } |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 2362 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 2363 | while (skip >= unix_skb_len(skb)) { |
| 2364 | skip -= unix_skb_len(skb); |
Benjamin Poirier | 79f632c | 2013-04-29 11:42:14 +0000 | [diff] [blame] | 2365 | last = skb; |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2366 | last_len = skb->len; |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 2367 | skb = skb_peek_next(skb, &sk->sk_receive_queue); |
Benjamin Poirier | 79f632c | 2013-04-29 11:42:14 +0000 | [diff] [blame] | 2368 | if (!skb) |
| 2369 | goto again; |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 2370 | } |
| 2371 | |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 2372 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2373 | |
| 2374 | if (check_creds) { |
| 2375 | /* Never glue messages from different writers */ |
Hannes Frederic Sowa | 9490f88 | 2015-11-26 12:08:18 +0100 | [diff] [blame] | 2376 | if (!unix_skb_scm_eq(skb, &scm)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2377 | break; |
Eric W. Biederman | 0e82e7f6d | 2013-04-03 16:14:47 +0000 | [diff] [blame] | 2378 | } else if (test_bit(SOCK_PASSCRED, &sock->flags)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2379 | /* Copy credentials */ |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2380 | scm_set_cred(&scm, UNIXCB(skb).pid, UNIXCB(skb).uid, UNIXCB(skb).gid); |
Stephen Smalley | 37a9a8d | 2015-06-10 08:44:59 -0400 | [diff] [blame] | 2381 | unix_set_secdata(&scm, skb); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2382 | check_creds = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2383 | } |
| 2384 | |
| 2385 | /* Copy address just once */ |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2386 | if (state->msg && state->msg->msg_name) { |
| 2387 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, |
| 2388 | state->msg->msg_name); |
| 2389 | unix_copy_addr(state->msg, skb->sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2390 | sunaddr = NULL; |
| 2391 | } |
| 2392 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 2393 | chunk = min_t(unsigned int, unix_skb_len(skb) - skip, size); |
Hannes Frederic Sowa | 73ed5d2 | 2015-11-10 16:23:15 +0100 | [diff] [blame] | 2394 | skb_get(skb); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2395 | chunk = state->recv_actor(skb, skip, chunk, state); |
Hannes Frederic Sowa | 73ed5d2 | 2015-11-10 16:23:15 +0100 | [diff] [blame] | 2396 | drop_skb = !unix_skb_len(skb); |
| 2397 | /* skb is only safe to use if !drop_skb */ |
| 2398 | consume_skb(skb); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2399 | if (chunk < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2400 | if (copied == 0) |
| 2401 | copied = -EFAULT; |
| 2402 | break; |
| 2403 | } |
| 2404 | copied += chunk; |
| 2405 | size -= chunk; |
| 2406 | |
Hannes Frederic Sowa | 73ed5d2 | 2015-11-10 16:23:15 +0100 | [diff] [blame] | 2407 | if (drop_skb) { |
| 2408 | /* the skb was touched by a concurrent reader; |
| 2409 | * we should not expect anything from this skb |
| 2410 | * anymore and assume it invalid - we can be |
| 2411 | * sure it was dropped from the socket queue |
| 2412 | * |
| 2413 | * let's report a short read |
| 2414 | */ |
| 2415 | err = 0; |
| 2416 | break; |
| 2417 | } |
| 2418 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2419 | /* Mark read part of skb as used */ |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2420 | if (!(flags & MSG_PEEK)) { |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 2421 | UNIXCB(skb).consumed += chunk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2422 | |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 2423 | sk_peek_offset_bwd(sk, chunk); |
| 2424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2425 | if (UNIXCB(skb).fp) |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2426 | unix_detach_fds(&scm, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2427 | |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 2428 | if (unix_skb_len(skb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2429 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2430 | |
Eric Dumazet | 6f01fd6 | 2012-01-28 16:11:03 +0000 | [diff] [blame] | 2431 | skb_unlink(skb, &sk->sk_receive_queue); |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 2432 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2433 | |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2434 | if (scm.fp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2435 | break; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2436 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2437 | /* It is questionable, see note in unix_dgram_recvmsg. |
| 2438 | */ |
| 2439 | if (UNIXCB(skb).fp) |
Christoph Hellwig | 7cc0566 | 2015-01-28 18:04:53 +0100 | [diff] [blame] | 2440 | scm.fp = scm_fp_dup(UNIXCB(skb).fp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2441 | |
Andrey Vagin | e9193d6 | 2015-10-02 00:05:36 +0300 | [diff] [blame] | 2442 | sk_peek_offset_fwd(sk, chunk); |
Pavel Emelyanov | fc0d753 | 2012-02-21 07:32:06 +0000 | [diff] [blame] | 2443 | |
Aaron Conole | 9f389e3 | 2015-09-26 18:50:43 -0400 | [diff] [blame] | 2444 | if (UNIXCB(skb).fp) |
| 2445 | break; |
| 2446 | |
Andrey Vagin | e9193d6 | 2015-10-02 00:05:36 +0300 | [diff] [blame] | 2447 | skip = 0; |
Aaron Conole | 9f389e3 | 2015-09-26 18:50:43 -0400 | [diff] [blame] | 2448 | last = skb; |
| 2449 | last_len = skb->len; |
| 2450 | unix_state_lock(sk); |
| 2451 | skb = skb_peek_next(skb, &sk->sk_receive_queue); |
| 2452 | if (skb) |
| 2453 | goto again; |
| 2454 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2455 | break; |
| 2456 | } |
| 2457 | } while (size); |
| 2458 | |
Linus Torvalds | 6e1ce3c | 2016-09-01 14:43:53 -0700 | [diff] [blame] | 2459 | mutex_unlock(&u->iolock); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2460 | if (state->msg) |
| 2461 | scm_recv(sock, state->msg, &scm, flags); |
| 2462 | else |
| 2463 | scm_destroy(&scm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2464 | out: |
| 2465 | return copied ? : err; |
| 2466 | } |
| 2467 | |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2468 | static int unix_stream_read_actor(struct sk_buff *skb, |
| 2469 | int skip, int chunk, |
| 2470 | struct unix_stream_read_state *state) |
| 2471 | { |
| 2472 | int ret; |
| 2473 | |
| 2474 | ret = skb_copy_datagram_msg(skb, UNIXCB(skb).consumed + skip, |
| 2475 | state->msg, chunk); |
| 2476 | return ret ?: chunk; |
| 2477 | } |
| 2478 | |
| 2479 | static int unix_stream_recvmsg(struct socket *sock, struct msghdr *msg, |
| 2480 | size_t size, int flags) |
| 2481 | { |
| 2482 | struct unix_stream_read_state state = { |
| 2483 | .recv_actor = unix_stream_read_actor, |
| 2484 | .socket = sock, |
| 2485 | .msg = msg, |
| 2486 | .size = size, |
| 2487 | .flags = flags |
| 2488 | }; |
| 2489 | |
WANG Cong | 06a77b0 | 2016-11-17 15:55:26 -0800 | [diff] [blame] | 2490 | return unix_stream_read_generic(&state, true); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2491 | } |
| 2492 | |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2493 | static int unix_stream_splice_actor(struct sk_buff *skb, |
| 2494 | int skip, int chunk, |
| 2495 | struct unix_stream_read_state *state) |
| 2496 | { |
| 2497 | return skb_splice_bits(skb, state->socket->sk, |
| 2498 | UNIXCB(skb).consumed + skip, |
Al Viro | 2586926 | 2016-09-17 21:02:10 -0400 | [diff] [blame] | 2499 | state->pipe, chunk, state->splice_flags); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2500 | } |
| 2501 | |
| 2502 | static ssize_t unix_stream_splice_read(struct socket *sock, loff_t *ppos, |
| 2503 | struct pipe_inode_info *pipe, |
| 2504 | size_t size, unsigned int flags) |
| 2505 | { |
| 2506 | struct unix_stream_read_state state = { |
| 2507 | .recv_actor = unix_stream_splice_actor, |
| 2508 | .socket = sock, |
| 2509 | .pipe = pipe, |
| 2510 | .size = size, |
| 2511 | .splice_flags = flags, |
| 2512 | }; |
| 2513 | |
| 2514 | if (unlikely(*ppos)) |
| 2515 | return -ESPIPE; |
| 2516 | |
| 2517 | if (sock->file->f_flags & O_NONBLOCK || |
| 2518 | flags & SPLICE_F_NONBLOCK) |
| 2519 | state.flags = MSG_DONTWAIT; |
| 2520 | |
WANG Cong | 06a77b0 | 2016-11-17 15:55:26 -0800 | [diff] [blame] | 2521 | return unix_stream_read_generic(&state, false); |
Hannes Frederic Sowa | 2b51457 | 2015-05-21 17:00:01 +0200 | [diff] [blame] | 2522 | } |
| 2523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2524 | static int unix_shutdown(struct socket *sock, int mode) |
| 2525 | { |
| 2526 | struct sock *sk = sock->sk; |
| 2527 | struct sock *other; |
| 2528 | |
Xi Wang | fc61b92 | 2012-08-26 16:47:13 +0000 | [diff] [blame] | 2529 | if (mode < SHUT_RD || mode > SHUT_RDWR) |
| 2530 | return -EINVAL; |
| 2531 | /* This maps: |
| 2532 | * SHUT_RD (0) -> RCV_SHUTDOWN (1) |
| 2533 | * SHUT_WR (1) -> SEND_SHUTDOWN (2) |
| 2534 | * SHUT_RDWR (2) -> SHUTDOWN_MASK (3) |
| 2535 | */ |
| 2536 | ++mode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2537 | |
Alban Crequy | 7180a03 | 2011-01-19 04:56:36 +0000 | [diff] [blame] | 2538 | unix_state_lock(sk); |
| 2539 | sk->sk_shutdown |= mode; |
| 2540 | other = unix_peer(sk); |
| 2541 | if (other) |
| 2542 | sock_hold(other); |
| 2543 | unix_state_unlock(sk); |
| 2544 | sk->sk_state_change(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2545 | |
Alban Crequy | 7180a03 | 2011-01-19 04:56:36 +0000 | [diff] [blame] | 2546 | if (other && |
| 2547 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2548 | |
Alban Crequy | 7180a03 | 2011-01-19 04:56:36 +0000 | [diff] [blame] | 2549 | int peer_mode = 0; |
| 2550 | |
| 2551 | if (mode&RCV_SHUTDOWN) |
| 2552 | peer_mode |= SEND_SHUTDOWN; |
| 2553 | if (mode&SEND_SHUTDOWN) |
| 2554 | peer_mode |= RCV_SHUTDOWN; |
| 2555 | unix_state_lock(other); |
| 2556 | other->sk_shutdown |= peer_mode; |
| 2557 | unix_state_unlock(other); |
| 2558 | other->sk_state_change(other); |
| 2559 | if (peer_mode == SHUTDOWN_MASK) |
| 2560 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); |
| 2561 | else if (peer_mode & RCV_SHUTDOWN) |
| 2562 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2563 | } |
Alban Crequy | 7180a03 | 2011-01-19 04:56:36 +0000 | [diff] [blame] | 2564 | if (other) |
| 2565 | sock_put(other); |
| 2566 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2567 | return 0; |
| 2568 | } |
| 2569 | |
Pavel Emelyanov | 885ee74 | 2011-12-30 00:54:11 +0000 | [diff] [blame] | 2570 | long unix_inq_len(struct sock *sk) |
| 2571 | { |
| 2572 | struct sk_buff *skb; |
| 2573 | long amount = 0; |
| 2574 | |
| 2575 | if (sk->sk_state == TCP_LISTEN) |
| 2576 | return -EINVAL; |
| 2577 | |
| 2578 | spin_lock(&sk->sk_receive_queue.lock); |
| 2579 | if (sk->sk_type == SOCK_STREAM || |
| 2580 | sk->sk_type == SOCK_SEQPACKET) { |
| 2581 | skb_queue_walk(&sk->sk_receive_queue, skb) |
Eric Dumazet | e370a72 | 2013-08-08 14:37:32 -0700 | [diff] [blame] | 2582 | amount += unix_skb_len(skb); |
Pavel Emelyanov | 885ee74 | 2011-12-30 00:54:11 +0000 | [diff] [blame] | 2583 | } else { |
| 2584 | skb = skb_peek(&sk->sk_receive_queue); |
| 2585 | if (skb) |
| 2586 | amount = skb->len; |
| 2587 | } |
| 2588 | spin_unlock(&sk->sk_receive_queue.lock); |
| 2589 | |
| 2590 | return amount; |
| 2591 | } |
| 2592 | EXPORT_SYMBOL_GPL(unix_inq_len); |
| 2593 | |
| 2594 | long unix_outq_len(struct sock *sk) |
| 2595 | { |
| 2596 | return sk_wmem_alloc_get(sk); |
| 2597 | } |
| 2598 | EXPORT_SYMBOL_GPL(unix_outq_len); |
| 2599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2600 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 2601 | { |
| 2602 | struct sock *sk = sock->sk; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 2603 | long amount = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2604 | int err; |
| 2605 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2606 | switch (cmd) { |
| 2607 | case SIOCOUTQ: |
Pavel Emelyanov | 885ee74 | 2011-12-30 00:54:11 +0000 | [diff] [blame] | 2608 | amount = unix_outq_len(sk); |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2609 | err = put_user(amount, (int __user *)arg); |
| 2610 | break; |
| 2611 | case SIOCINQ: |
Pavel Emelyanov | 885ee74 | 2011-12-30 00:54:11 +0000 | [diff] [blame] | 2612 | amount = unix_inq_len(sk); |
| 2613 | if (amount < 0) |
| 2614 | err = amount; |
| 2615 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2616 | err = put_user(amount, (int __user *)arg); |
Pavel Emelyanov | 885ee74 | 2011-12-30 00:54:11 +0000 | [diff] [blame] | 2617 | break; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2618 | default: |
| 2619 | err = -ENOIOCTLCMD; |
| 2620 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2621 | } |
| 2622 | return err; |
| 2623 | } |
| 2624 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2625 | static unsigned int unix_poll(struct file *file, struct socket *sock, poll_table *wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2626 | { |
| 2627 | struct sock *sk = sock->sk; |
| 2628 | unsigned int mask; |
| 2629 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2630 | sock_poll_wait(file, sk_sleep(sk), wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2631 | mask = 0; |
| 2632 | |
| 2633 | /* exceptional events? */ |
| 2634 | if (sk->sk_err) |
| 2635 | mask |= POLLERR; |
| 2636 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
| 2637 | mask |= POLLHUP; |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 2638 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Eric Dumazet | db40980 | 2010-09-06 11:13:50 +0000 | [diff] [blame] | 2639 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2640 | |
| 2641 | /* readable? */ |
Eric Dumazet | db40980 | 2010-09-06 11:13:50 +0000 | [diff] [blame] | 2642 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | mask |= POLLIN | POLLRDNORM; |
| 2644 | |
| 2645 | /* Connection-based need to check for termination and startup */ |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2646 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && |
| 2647 | sk->sk_state == TCP_CLOSE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2648 | mask |= POLLHUP; |
| 2649 | |
| 2650 | /* |
| 2651 | * we set writable also when the other side has shut down the |
| 2652 | * connection. This prevents stuck sockets. |
| 2653 | */ |
| 2654 | if (unix_writable(sk)) |
| 2655 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
| 2656 | |
| 2657 | return mask; |
| 2658 | } |
| 2659 | |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2660 | static unsigned int unix_dgram_poll(struct file *file, struct socket *sock, |
| 2661 | poll_table *wait) |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2662 | { |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2663 | struct sock *sk = sock->sk, *other; |
| 2664 | unsigned int mask, writable; |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2665 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2666 | sock_poll_wait(file, sk_sleep(sk), wait); |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2667 | mask = 0; |
| 2668 | |
| 2669 | /* exceptional events? */ |
| 2670 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) |
Keller, Jacob E | 7d4c04f | 2013-03-28 11:19:25 +0000 | [diff] [blame] | 2671 | mask |= POLLERR | |
Jacob Keller | 8facd5f | 2013-04-02 13:55:40 -0700 | [diff] [blame] | 2672 | (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? POLLPRI : 0); |
Keller, Jacob E | 7d4c04f | 2013-03-28 11:19:25 +0000 | [diff] [blame] | 2673 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2674 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Eric Dumazet | 5456f09 | 2010-10-31 05:36:23 +0000 | [diff] [blame] | 2675 | mask |= POLLRDHUP | POLLIN | POLLRDNORM; |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2676 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
| 2677 | mask |= POLLHUP; |
| 2678 | |
| 2679 | /* readable? */ |
Eric Dumazet | 5456f09 | 2010-10-31 05:36:23 +0000 | [diff] [blame] | 2680 | if (!skb_queue_empty(&sk->sk_receive_queue)) |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2681 | mask |= POLLIN | POLLRDNORM; |
| 2682 | |
| 2683 | /* Connection-based need to check for termination and startup */ |
| 2684 | if (sk->sk_type == SOCK_SEQPACKET) { |
| 2685 | if (sk->sk_state == TCP_CLOSE) |
| 2686 | mask |= POLLHUP; |
| 2687 | /* connection hasn't started yet? */ |
| 2688 | if (sk->sk_state == TCP_SYN_SENT) |
| 2689 | return mask; |
| 2690 | } |
| 2691 | |
Eric Dumazet | 973a34a | 2010-10-31 05:38:25 +0000 | [diff] [blame] | 2692 | /* No write status requested, avoid expensive OUT tests. */ |
Hans Verkuil | 626cf23 | 2012-03-23 15:02:27 -0700 | [diff] [blame] | 2693 | if (!(poll_requested_events(wait) & (POLLWRBAND|POLLWRNORM|POLLOUT))) |
Eric Dumazet | 973a34a | 2010-10-31 05:38:25 +0000 | [diff] [blame] | 2694 | return mask; |
| 2695 | |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2696 | writable = unix_writable(sk); |
Rainer Weikusat | 7d26727 | 2015-11-20 22:07:23 +0000 | [diff] [blame] | 2697 | if (writable) { |
| 2698 | unix_state_lock(sk); |
| 2699 | |
| 2700 | other = unix_peer(sk); |
| 2701 | if (other && unix_peer(other) != sk && |
| 2702 | unix_recvq_full(other) && |
| 2703 | unix_dgram_peer_wake_me(sk, other)) |
| 2704 | writable = 0; |
| 2705 | |
| 2706 | unix_state_unlock(sk); |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2707 | } |
| 2708 | |
| 2709 | if (writable) |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2710 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
| 2711 | else |
Eric Dumazet | 9cd3e07 | 2015-11-29 20:03:10 -0800 | [diff] [blame] | 2712 | sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2713 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2714 | return mask; |
| 2715 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2716 | |
| 2717 | #ifdef CONFIG_PROC_FS |
Pavel Emelyanov | a53eb3f | 2007-11-23 20:30:01 +0800 | [diff] [blame] | 2718 | |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2719 | #define BUCKET_SPACE (BITS_PER_LONG - (UNIX_HASH_BITS + 1) - 1) |
| 2720 | |
| 2721 | #define get_bucket(x) ((x) >> BUCKET_SPACE) |
| 2722 | #define get_offset(x) ((x) & ((1L << BUCKET_SPACE) - 1)) |
| 2723 | #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o)) |
Pavel Emelyanov | a53eb3f | 2007-11-23 20:30:01 +0800 | [diff] [blame] | 2724 | |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2725 | static struct sock *unix_from_bucket(struct seq_file *seq, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2726 | { |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2727 | unsigned long offset = get_offset(*pos); |
| 2728 | unsigned long bucket = get_bucket(*pos); |
| 2729 | struct sock *sk; |
| 2730 | unsigned long count = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2731 | |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2732 | for (sk = sk_head(&unix_socket_table[bucket]); sk; sk = sk_next(sk)) { |
| 2733 | if (sock_net(sk) != seq_file_net(seq)) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2734 | continue; |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2735 | if (++count == offset) |
| 2736 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | } |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2738 | |
| 2739 | return sk; |
| 2740 | } |
| 2741 | |
| 2742 | static struct sock *unix_next_socket(struct seq_file *seq, |
| 2743 | struct sock *sk, |
| 2744 | loff_t *pos) |
| 2745 | { |
| 2746 | unsigned long bucket; |
| 2747 | |
| 2748 | while (sk > (struct sock *)SEQ_START_TOKEN) { |
| 2749 | sk = sk_next(sk); |
| 2750 | if (!sk) |
| 2751 | goto next_bucket; |
| 2752 | if (sock_net(sk) == seq_file_net(seq)) |
| 2753 | return sk; |
| 2754 | } |
| 2755 | |
| 2756 | do { |
| 2757 | sk = unix_from_bucket(seq, pos); |
| 2758 | if (sk) |
| 2759 | return sk; |
| 2760 | |
| 2761 | next_bucket: |
| 2762 | bucket = get_bucket(*pos) + 1; |
| 2763 | *pos = set_bucket_offset(bucket, 1); |
| 2764 | } while (bucket < ARRAY_SIZE(unix_socket_table)); |
| 2765 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2766 | return NULL; |
| 2767 | } |
| 2768 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2769 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2770 | __acquires(unix_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2771 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 2772 | spin_lock(&unix_table_lock); |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2773 | |
| 2774 | if (!*pos) |
| 2775 | return SEQ_START_TOKEN; |
| 2776 | |
| 2777 | if (get_bucket(*pos) >= ARRAY_SIZE(unix_socket_table)) |
| 2778 | return NULL; |
| 2779 | |
| 2780 | return unix_next_socket(seq, NULL, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2781 | } |
| 2782 | |
| 2783 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2784 | { |
| 2785 | ++*pos; |
Eric Dumazet | 7123aaa | 2012-06-08 05:03:21 +0000 | [diff] [blame] | 2786 | return unix_next_socket(seq, v, pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2787 | } |
| 2788 | |
| 2789 | static void unix_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2790 | __releases(unix_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2791 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 2792 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2793 | } |
| 2794 | |
| 2795 | static int unix_seq_show(struct seq_file *seq, void *v) |
| 2796 | { |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2797 | |
Joe Perches | b9f3124 | 2008-04-12 19:04:38 -0700 | [diff] [blame] | 2798 | if (v == SEQ_START_TOKEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2799 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
| 2800 | "Inode Path\n"); |
| 2801 | else { |
| 2802 | struct sock *s = v; |
| 2803 | struct unix_sock *u = unix_sk(s); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2804 | unix_state_lock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2805 | |
Dan Rosenberg | 71338aa | 2011-05-23 12:17:35 +0000 | [diff] [blame] | 2806 | seq_printf(seq, "%pK: %08X %08X %08X %04X %02X %5lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2807 | s, |
| 2808 | atomic_read(&s->sk_refcnt), |
| 2809 | 0, |
| 2810 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, |
| 2811 | s->sk_type, |
| 2812 | s->sk_socket ? |
| 2813 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : |
| 2814 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), |
| 2815 | sock_i_ino(s)); |
| 2816 | |
| 2817 | if (u->addr) { |
| 2818 | int i, len; |
| 2819 | seq_putc(seq, ' '); |
| 2820 | |
| 2821 | i = 0; |
| 2822 | len = u->addr->len - sizeof(short); |
| 2823 | if (!UNIX_ABSTRACT(s)) |
| 2824 | len--; |
| 2825 | else { |
| 2826 | seq_putc(seq, '@'); |
| 2827 | i++; |
| 2828 | } |
| 2829 | for ( ; i < len; i++) |
Isaac Boukris | e7947ea | 2016-11-01 02:41:35 +0200 | [diff] [blame] | 2830 | seq_putc(seq, u->addr->name->sun_path[i] ?: |
| 2831 | '@'); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2832 | } |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2833 | unix_state_unlock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2834 | seq_putc(seq, '\n'); |
| 2835 | } |
| 2836 | |
| 2837 | return 0; |
| 2838 | } |
| 2839 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 2840 | static const struct seq_operations unix_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2841 | .start = unix_seq_start, |
| 2842 | .next = unix_seq_next, |
| 2843 | .stop = unix_seq_stop, |
| 2844 | .show = unix_seq_show, |
| 2845 | }; |
| 2846 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2847 | static int unix_seq_open(struct inode *inode, struct file *file) |
| 2848 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2849 | return seq_open_net(inode, file, &unix_seq_ops, |
Eric Dumazet | 8b51b06 | 2012-06-08 22:10:20 +0000 | [diff] [blame] | 2850 | sizeof(struct seq_net_private)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2851 | } |
| 2852 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 2853 | static const struct file_operations unix_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2854 | .owner = THIS_MODULE, |
| 2855 | .open = unix_seq_open, |
| 2856 | .read = seq_read, |
| 2857 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2858 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2859 | }; |
| 2860 | |
| 2861 | #endif |
| 2862 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 2863 | static const struct net_proto_family unix_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2864 | .family = PF_UNIX, |
| 2865 | .create = unix_create, |
| 2866 | .owner = THIS_MODULE, |
| 2867 | }; |
| 2868 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2869 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2870 | static int __net_init unix_net_init(struct net *net) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2871 | { |
| 2872 | int error = -ENOMEM; |
| 2873 | |
Denis V. Lunev | a0a53c8 | 2007-12-11 04:19:17 -0800 | [diff] [blame] | 2874 | net->unx.sysctl_max_dgram_qlen = 10; |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2875 | if (unix_sysctl_register(net)) |
| 2876 | goto out; |
Pavel Emelyanov | d392e49 | 2007-12-01 23:44:15 +1100 | [diff] [blame] | 2877 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2878 | #ifdef CONFIG_PROC_FS |
Gao feng | d4beaa6 | 2013-02-18 01:34:54 +0000 | [diff] [blame] | 2879 | if (!proc_create("unix", 0, net->proc_net, &unix_seq_fops)) { |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2880 | unix_sysctl_unregister(net); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2881 | goto out; |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2882 | } |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2883 | #endif |
| 2884 | error = 0; |
| 2885 | out: |
Jianjun Kong | 48dcc33e | 2008-11-01 21:37:27 -0700 | [diff] [blame] | 2886 | return error; |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2887 | } |
| 2888 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2889 | static void __net_exit unix_net_exit(struct net *net) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2890 | { |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2891 | unix_sysctl_unregister(net); |
Gao feng | ece31ff | 2013-02-18 01:34:56 +0000 | [diff] [blame] | 2892 | remove_proc_entry("unix", net->proc_net); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2893 | } |
| 2894 | |
| 2895 | static struct pernet_operations unix_net_ops = { |
| 2896 | .init = unix_net_init, |
| 2897 | .exit = unix_net_exit, |
| 2898 | }; |
| 2899 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2900 | static int __init af_unix_init(void) |
| 2901 | { |
| 2902 | int rc = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | |
YOSHIFUJI Hideaki / 吉藤英明 | b4fff5f | 2013-01-09 07:20:07 +0000 | [diff] [blame] | 2904 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > FIELD_SIZEOF(struct sk_buff, cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2905 | |
| 2906 | rc = proto_register(&unix_proto, 1); |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2907 | if (rc != 0) { |
wangweidong | 5cc208b | 2013-12-06 18:03:36 +0800 | [diff] [blame] | 2908 | pr_crit("%s: Cannot create unix_sock SLAB cache!\n", __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2909 | goto out; |
| 2910 | } |
| 2911 | |
| 2912 | sock_register(&unix_family_ops); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2913 | register_pernet_subsys(&unix_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2914 | out: |
| 2915 | return rc; |
| 2916 | } |
| 2917 | |
| 2918 | static void __exit af_unix_exit(void) |
| 2919 | { |
| 2920 | sock_unregister(PF_UNIX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2921 | proto_unregister(&unix_proto); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2922 | unregister_pernet_subsys(&unix_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2923 | } |
| 2924 | |
David Woodhouse | 3d36696 | 2008-04-24 00:59:25 -0700 | [diff] [blame] | 2925 | /* Earlier than device_initcall() so that other drivers invoking |
| 2926 | request_module() don't end up in a loop when modprobe tries |
| 2927 | to use a UNIX socket. But later than subsys_initcall() because |
| 2928 | we depend on stuff initialised there */ |
| 2929 | fs_initcall(af_unix_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2930 | module_exit(af_unix_exit); |
| 2931 | |
| 2932 | MODULE_LICENSE("GPL"); |
| 2933 | MODULE_ALIAS_NETPROTO(PF_UNIX); |