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 | |
| 83 | #include <linux/module.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | #include <linux/kernel.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | #include <linux/signal.h> |
| 86 | #include <linux/sched.h> |
| 87 | #include <linux/errno.h> |
| 88 | #include <linux/string.h> |
| 89 | #include <linux/stat.h> |
| 90 | #include <linux/dcache.h> |
| 91 | #include <linux/namei.h> |
| 92 | #include <linux/socket.h> |
| 93 | #include <linux/un.h> |
| 94 | #include <linux/fcntl.h> |
| 95 | #include <linux/termios.h> |
| 96 | #include <linux/sockios.h> |
| 97 | #include <linux/net.h> |
| 98 | #include <linux/in.h> |
| 99 | #include <linux/fs.h> |
| 100 | #include <linux/slab.h> |
| 101 | #include <asm/uaccess.h> |
| 102 | #include <linux/skbuff.h> |
| 103 | #include <linux/netdevice.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 104 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #include <net/sock.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 106 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | #include <net/af_unix.h> |
| 108 | #include <linux/proc_fs.h> |
| 109 | #include <linux/seq_file.h> |
| 110 | #include <net/scm.h> |
| 111 | #include <linux/init.h> |
| 112 | #include <linux/poll.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | #include <linux/rtnetlink.h> |
| 114 | #include <linux/mount.h> |
| 115 | #include <net/checksum.h> |
| 116 | #include <linux/security.h> |
| 117 | |
Adrian Bunk | 1311169 | 2007-07-30 18:05:45 -0700 | [diff] [blame] | 118 | static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; |
| 119 | static DEFINE_SPINLOCK(unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | static atomic_t unix_nr_socks = ATOMIC_INIT(0); |
| 121 | |
| 122 | #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE]) |
| 123 | |
| 124 | #define UNIX_ABSTRACT(sk) (unix_sk(sk)->addr->hash != UNIX_HASH_SIZE) |
| 125 | |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 126 | #ifdef CONFIG_SECURITY_NETWORK |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 127 | 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] | 128 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 129 | memcpy(UNIXSID(skb), &scm->secid, sizeof(u32)); |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 130 | } |
| 131 | |
| 132 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
| 133 | { |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 134 | scm->secid = *UNIXSID(skb); |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 135 | } |
| 136 | #else |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 137 | 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] | 138 | { } |
| 139 | |
| 140 | static inline void unix_set_secdata(struct scm_cookie *scm, struct sk_buff *skb) |
| 141 | { } |
| 142 | #endif /* CONFIG_SECURITY_NETWORK */ |
| 143 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | /* |
| 145 | * SMP locking strategy: |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 146 | * hash table is protected with spinlock unix_table_lock |
Stephen Hemminger | 663717f | 2010-02-18 14:12:06 -0800 | [diff] [blame] | 147 | * each socket state is protected by separate spin lock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | */ |
| 149 | |
Al Viro | 44bb936 | 2006-11-14 21:36:14 -0800 | [diff] [blame] | 150 | static inline unsigned unix_hash_fold(__wsum n) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | { |
Al Viro | 44bb936 | 2006-11-14 21:36:14 -0800 | [diff] [blame] | 152 | unsigned hash = (__force unsigned)n; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | hash ^= hash>>16; |
| 154 | hash ^= hash>>8; |
| 155 | return hash&(UNIX_HASH_SIZE-1); |
| 156 | } |
| 157 | |
| 158 | #define unix_peer(sk) (unix_sk(sk)->peer) |
| 159 | |
| 160 | static inline int unix_our_peer(struct sock *sk, struct sock *osk) |
| 161 | { |
| 162 | return unix_peer(osk) == sk; |
| 163 | } |
| 164 | |
| 165 | static inline int unix_may_send(struct sock *sk, struct sock *osk) |
| 166 | { |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 167 | return unix_peer(osk) == NULL || unix_our_peer(sk, osk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | } |
| 169 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 170 | static inline int unix_recvq_full(struct sock const *sk) |
| 171 | { |
| 172 | return skb_queue_len(&sk->sk_receive_queue) > sk->sk_max_ack_backlog; |
| 173 | } |
| 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | static struct sock *unix_peer_get(struct sock *s) |
| 176 | { |
| 177 | struct sock *peer; |
| 178 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 179 | unix_state_lock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | peer = unix_peer(s); |
| 181 | if (peer) |
| 182 | sock_hold(peer); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 183 | unix_state_unlock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | return peer; |
| 185 | } |
| 186 | |
| 187 | static inline void unix_release_addr(struct unix_address *addr) |
| 188 | { |
| 189 | if (atomic_dec_and_test(&addr->refcnt)) |
| 190 | kfree(addr); |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Check unix socket name: |
| 195 | * - should be not zero length. |
| 196 | * - if started by not zero, should be NULL terminated (FS object) |
| 197 | * - if started by zero, it is abstract name. |
| 198 | */ |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 199 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 200 | static int unix_mkname(struct sockaddr_un *sunaddr, int len, unsigned *hashp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | { |
| 202 | if (len <= sizeof(short) || len > sizeof(*sunaddr)) |
| 203 | return -EINVAL; |
| 204 | if (!sunaddr || sunaddr->sun_family != AF_UNIX) |
| 205 | return -EINVAL; |
| 206 | if (sunaddr->sun_path[0]) { |
| 207 | /* |
| 208 | * This may look like an off by one error but it is a bit more |
| 209 | * subtle. 108 is the longest valid AF_UNIX path for a binding. |
| 210 | * sun_path[108] doesnt as such exist. However in kernel space |
| 211 | * we are guaranteed that it is a valid memory location in our |
| 212 | * kernel address buffer. |
| 213 | */ |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 214 | ((char *)sunaddr)[len] = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | len = strlen(sunaddr->sun_path)+1+sizeof(short); |
| 216 | return len; |
| 217 | } |
| 218 | |
Joe Perches | 07f0757 | 2008-11-19 15:44:53 -0800 | [diff] [blame] | 219 | *hashp = unix_hash_fold(csum_partial(sunaddr, len, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | return len; |
| 221 | } |
| 222 | |
| 223 | static void __unix_remove_socket(struct sock *sk) |
| 224 | { |
| 225 | sk_del_node_init(sk); |
| 226 | } |
| 227 | |
| 228 | static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) |
| 229 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 230 | WARN_ON(!sk_unhashed(sk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 231 | sk_add_node(sk, list); |
| 232 | } |
| 233 | |
| 234 | static inline void unix_remove_socket(struct sock *sk) |
| 235 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 236 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | __unix_remove_socket(sk); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 238 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) |
| 242 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 243 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | __unix_insert_socket(list, sk); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 245 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | } |
| 247 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 248 | static struct sock *__unix_find_socket_byname(struct net *net, |
| 249 | struct sockaddr_un *sunname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | int len, int type, unsigned hash) |
| 251 | { |
| 252 | struct sock *s; |
| 253 | struct hlist_node *node; |
| 254 | |
| 255 | sk_for_each(s, node, &unix_socket_table[hash ^ type]) { |
| 256 | struct unix_sock *u = unix_sk(s); |
| 257 | |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 258 | if (!net_eq(sock_net(s), net)) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 259 | continue; |
| 260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (u->addr->len == len && |
| 262 | !memcmp(u->addr->name, sunname, len)) |
| 263 | goto found; |
| 264 | } |
| 265 | s = NULL; |
| 266 | found: |
| 267 | return s; |
| 268 | } |
| 269 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 270 | static inline struct sock *unix_find_socket_byname(struct net *net, |
| 271 | struct sockaddr_un *sunname, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | int len, int type, |
| 273 | unsigned hash) |
| 274 | { |
| 275 | struct sock *s; |
| 276 | |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 277 | spin_lock(&unix_table_lock); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 278 | s = __unix_find_socket_byname(net, sunname, len, type, hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | if (s) |
| 280 | sock_hold(s); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 281 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | return s; |
| 283 | } |
| 284 | |
Eric W. Biederman | 6616f78 | 2010-06-13 03:35:48 +0000 | [diff] [blame] | 285 | static struct sock *unix_find_socket_byinode(struct inode *i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | { |
| 287 | struct sock *s; |
| 288 | struct hlist_node *node; |
| 289 | |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 290 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | sk_for_each(s, node, |
| 292 | &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { |
| 293 | struct dentry *dentry = unix_sk(s)->dentry; |
| 294 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 295 | if (dentry && dentry->d_inode == i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | sock_hold(s); |
| 297 | goto found; |
| 298 | } |
| 299 | } |
| 300 | s = NULL; |
| 301 | found: |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 302 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | return s; |
| 304 | } |
| 305 | |
| 306 | static inline int unix_writable(struct sock *sk) |
| 307 | { |
| 308 | return (atomic_read(&sk->sk_wmem_alloc) << 2) <= sk->sk_sndbuf; |
| 309 | } |
| 310 | |
| 311 | static void unix_write_space(struct sock *sk) |
| 312 | { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 313 | struct socket_wq *wq; |
| 314 | |
| 315 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | if (unix_writable(sk)) { |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 317 | wq = rcu_dereference(sk->sk_wq); |
| 318 | if (wq_has_sleeper(wq)) |
| 319 | wake_up_interruptible_sync(&wq->wait); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 320 | sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | } |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 322 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | } |
| 324 | |
| 325 | /* When dgram socket disconnects (or changes its peer), we clear its receive |
| 326 | * queue of packets arrived from previous peer. First, it allows to do |
| 327 | * flow control based only on wmem_alloc; second, sk connected to peer |
| 328 | * may receive messages only from that peer. */ |
| 329 | static void unix_dgram_disconnected(struct sock *sk, struct sock *other) |
| 330 | { |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 331 | if (!skb_queue_empty(&sk->sk_receive_queue)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | skb_queue_purge(&sk->sk_receive_queue); |
| 333 | wake_up_interruptible_all(&unix_sk(sk)->peer_wait); |
| 334 | |
| 335 | /* If one link of bidirectional dgram pipe is disconnected, |
| 336 | * we signal error. Messages are lost. Do not make this, |
| 337 | * when peer was not connected to us. |
| 338 | */ |
| 339 | if (!sock_flag(other, SOCK_DEAD) && unix_peer(other) == sk) { |
| 340 | other->sk_err = ECONNRESET; |
| 341 | other->sk_error_report(other); |
| 342 | } |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | static void unix_sock_destructor(struct sock *sk) |
| 347 | { |
| 348 | struct unix_sock *u = unix_sk(sk); |
| 349 | |
| 350 | skb_queue_purge(&sk->sk_receive_queue); |
| 351 | |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 352 | WARN_ON(atomic_read(&sk->sk_wmem_alloc)); |
| 353 | WARN_ON(!sk_unhashed(sk)); |
| 354 | WARN_ON(sk->sk_socket); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | if (!sock_flag(sk, SOCK_DEAD)) { |
Eric Dumazet | 6b41e7d | 2008-11-19 15:48:09 -0800 | [diff] [blame] | 356 | printk(KERN_INFO "Attempt to release alive unix socket: %p\n", sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | return; |
| 358 | } |
| 359 | |
| 360 | if (u->addr) |
| 361 | unix_release_addr(u->addr); |
| 362 | |
| 363 | atomic_dec(&unix_nr_socks); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 364 | local_bh_disable(); |
Eric Dumazet | a8076d8 | 2008-11-17 02:38:49 -0800 | [diff] [blame] | 365 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
David S. Miller | 6f756a8 | 2008-11-23 17:34:03 -0800 | [diff] [blame] | 366 | local_bh_enable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | #ifdef UNIX_REFCNT_DEBUG |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 368 | printk(KERN_DEBUG "UNIX %p is destroyed, %d are still alive.\n", sk, |
| 369 | atomic_read(&unix_nr_socks)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | #endif |
| 371 | } |
| 372 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 373 | static int unix_release_sock(struct sock *sk, int embrion) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | { |
| 375 | struct unix_sock *u = unix_sk(sk); |
| 376 | struct dentry *dentry; |
| 377 | struct vfsmount *mnt; |
| 378 | struct sock *skpair; |
| 379 | struct sk_buff *skb; |
| 380 | int state; |
| 381 | |
| 382 | unix_remove_socket(sk); |
| 383 | |
| 384 | /* Clear state */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 385 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | sock_orphan(sk); |
| 387 | sk->sk_shutdown = SHUTDOWN_MASK; |
| 388 | dentry = u->dentry; |
| 389 | u->dentry = NULL; |
| 390 | mnt = u->mnt; |
| 391 | u->mnt = NULL; |
| 392 | state = sk->sk_state; |
| 393 | sk->sk_state = TCP_CLOSE; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 394 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
| 396 | wake_up_interruptible_all(&u->peer_wait); |
| 397 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 398 | skpair = unix_peer(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 400 | if (skpair != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 401 | if (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 402 | unix_state_lock(skpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 403 | /* No more writes */ |
| 404 | skpair->sk_shutdown = SHUTDOWN_MASK; |
| 405 | if (!skb_queue_empty(&sk->sk_receive_queue) || embrion) |
| 406 | skpair->sk_err = ECONNRESET; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 407 | unix_state_unlock(skpair); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | skpair->sk_state_change(skpair); |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 409 | sk_wake_async(skpair, SOCK_WAKE_WAITD, POLL_HUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | } |
| 411 | sock_put(skpair); /* It may now die */ |
| 412 | unix_peer(sk) = NULL; |
| 413 | } |
| 414 | |
| 415 | /* Try to flush out this socket. Throw out buffers at least */ |
| 416 | |
| 417 | while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 418 | if (state == TCP_LISTEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | unix_release_sock(skb->sk, 1); |
| 420 | /* passed fds are erased in the kfree_skb hook */ |
| 421 | kfree_skb(skb); |
| 422 | } |
| 423 | |
| 424 | if (dentry) { |
| 425 | dput(dentry); |
| 426 | mntput(mnt); |
| 427 | } |
| 428 | |
| 429 | sock_put(sk); |
| 430 | |
| 431 | /* ---- Socket is dead now and most probably destroyed ---- */ |
| 432 | |
| 433 | /* |
| 434 | * Fixme: BSD difference: In BSD all sockets connected to use get |
| 435 | * ECONNRESET and we die on the spot. In Linux we behave |
| 436 | * like files and pipes do and wait for the last |
| 437 | * dereference. |
| 438 | * |
| 439 | * Can't we simply set sock->err? |
| 440 | * |
| 441 | * What the above comment does talk about? --ANK(980817) |
| 442 | */ |
| 443 | |
Pavel Emelyanov | 9305cfa | 2007-11-10 22:06:01 -0800 | [diff] [blame] | 444 | if (unix_tot_inflight) |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 445 | unix_gc(); /* Garbage collect fds */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
| 447 | return 0; |
| 448 | } |
| 449 | |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 450 | static void init_peercred(struct sock *sk) |
| 451 | { |
| 452 | put_pid(sk->sk_peer_pid); |
| 453 | if (sk->sk_peer_cred) |
| 454 | put_cred(sk->sk_peer_cred); |
| 455 | sk->sk_peer_pid = get_pid(task_tgid(current)); |
| 456 | sk->sk_peer_cred = get_current_cred(); |
| 457 | } |
| 458 | |
| 459 | static void copy_peercred(struct sock *sk, struct sock *peersk) |
| 460 | { |
| 461 | put_pid(sk->sk_peer_pid); |
| 462 | if (sk->sk_peer_cred) |
| 463 | put_cred(sk->sk_peer_cred); |
| 464 | sk->sk_peer_pid = get_pid(peersk->sk_peer_pid); |
| 465 | sk->sk_peer_cred = get_cred(peersk->sk_peer_cred); |
| 466 | } |
| 467 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | static int unix_listen(struct socket *sock, int backlog) |
| 469 | { |
| 470 | int err; |
| 471 | struct sock *sk = sock->sk; |
| 472 | struct unix_sock *u = unix_sk(sk); |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 473 | struct pid *old_pid = NULL; |
| 474 | const struct cred *old_cred = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | |
| 476 | err = -EOPNOTSUPP; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 477 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
| 478 | goto out; /* Only stream/seqpacket sockets accept */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | err = -EINVAL; |
| 480 | if (!u->addr) |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 481 | goto out; /* No listens on an unbound socket */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 482 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | if (sk->sk_state != TCP_CLOSE && sk->sk_state != TCP_LISTEN) |
| 484 | goto out_unlock; |
| 485 | if (backlog > sk->sk_max_ack_backlog) |
| 486 | wake_up_interruptible_all(&u->peer_wait); |
| 487 | sk->sk_max_ack_backlog = backlog; |
| 488 | sk->sk_state = TCP_LISTEN; |
| 489 | /* set credentials so connect can copy them */ |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 490 | init_peercred(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | err = 0; |
| 492 | |
| 493 | out_unlock: |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 494 | unix_state_unlock(sk); |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 495 | put_pid(old_pid); |
| 496 | if (old_cred) |
| 497 | put_cred(old_cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | out: |
| 499 | return err; |
| 500 | } |
| 501 | |
| 502 | static int unix_release(struct socket *); |
| 503 | static int unix_bind(struct socket *, struct sockaddr *, int); |
| 504 | static int unix_stream_connect(struct socket *, struct sockaddr *, |
| 505 | int addr_len, int flags); |
| 506 | static int unix_socketpair(struct socket *, struct socket *); |
| 507 | static int unix_accept(struct socket *, struct socket *, int); |
| 508 | static int unix_getname(struct socket *, struct sockaddr *, int *, int); |
| 509 | static unsigned int unix_poll(struct file *, struct socket *, poll_table *); |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 510 | static unsigned int unix_dgram_poll(struct file *, struct socket *, |
| 511 | poll_table *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | static int unix_ioctl(struct socket *, unsigned int, unsigned long); |
| 513 | static int unix_shutdown(struct socket *, int); |
| 514 | static int unix_stream_sendmsg(struct kiocb *, struct socket *, |
| 515 | struct msghdr *, size_t); |
| 516 | static int unix_stream_recvmsg(struct kiocb *, struct socket *, |
| 517 | struct msghdr *, size_t, int); |
| 518 | static int unix_dgram_sendmsg(struct kiocb *, struct socket *, |
| 519 | struct msghdr *, size_t); |
| 520 | static int unix_dgram_recvmsg(struct kiocb *, struct socket *, |
| 521 | struct msghdr *, size_t, int); |
| 522 | static int unix_dgram_connect(struct socket *, struct sockaddr *, |
| 523 | int, int); |
| 524 | static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, |
| 525 | struct msghdr *, size_t); |
| 526 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 527 | static const struct proto_ops unix_stream_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | .family = PF_UNIX, |
| 529 | .owner = THIS_MODULE, |
| 530 | .release = unix_release, |
| 531 | .bind = unix_bind, |
| 532 | .connect = unix_stream_connect, |
| 533 | .socketpair = unix_socketpair, |
| 534 | .accept = unix_accept, |
| 535 | .getname = unix_getname, |
| 536 | .poll = unix_poll, |
| 537 | .ioctl = unix_ioctl, |
| 538 | .listen = unix_listen, |
| 539 | .shutdown = unix_shutdown, |
| 540 | .setsockopt = sock_no_setsockopt, |
| 541 | .getsockopt = sock_no_getsockopt, |
| 542 | .sendmsg = unix_stream_sendmsg, |
| 543 | .recvmsg = unix_stream_recvmsg, |
| 544 | .mmap = sock_no_mmap, |
| 545 | .sendpage = sock_no_sendpage, |
| 546 | }; |
| 547 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 548 | static const struct proto_ops unix_dgram_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | .family = PF_UNIX, |
| 550 | .owner = THIS_MODULE, |
| 551 | .release = unix_release, |
| 552 | .bind = unix_bind, |
| 553 | .connect = unix_dgram_connect, |
| 554 | .socketpair = unix_socketpair, |
| 555 | .accept = sock_no_accept, |
| 556 | .getname = unix_getname, |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 557 | .poll = unix_dgram_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | .ioctl = unix_ioctl, |
| 559 | .listen = sock_no_listen, |
| 560 | .shutdown = unix_shutdown, |
| 561 | .setsockopt = sock_no_setsockopt, |
| 562 | .getsockopt = sock_no_getsockopt, |
| 563 | .sendmsg = unix_dgram_sendmsg, |
| 564 | .recvmsg = unix_dgram_recvmsg, |
| 565 | .mmap = sock_no_mmap, |
| 566 | .sendpage = sock_no_sendpage, |
| 567 | }; |
| 568 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 569 | static const struct proto_ops unix_seqpacket_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | .family = PF_UNIX, |
| 571 | .owner = THIS_MODULE, |
| 572 | .release = unix_release, |
| 573 | .bind = unix_bind, |
| 574 | .connect = unix_stream_connect, |
| 575 | .socketpair = unix_socketpair, |
| 576 | .accept = unix_accept, |
| 577 | .getname = unix_getname, |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 578 | .poll = unix_dgram_poll, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | .ioctl = unix_ioctl, |
| 580 | .listen = unix_listen, |
| 581 | .shutdown = unix_shutdown, |
| 582 | .setsockopt = sock_no_setsockopt, |
| 583 | .getsockopt = sock_no_getsockopt, |
| 584 | .sendmsg = unix_seqpacket_sendmsg, |
| 585 | .recvmsg = unix_dgram_recvmsg, |
| 586 | .mmap = sock_no_mmap, |
| 587 | .sendpage = sock_no_sendpage, |
| 588 | }; |
| 589 | |
| 590 | static struct proto unix_proto = { |
Eric Dumazet | 248969a | 2008-11-17 00:00:30 -0800 | [diff] [blame] | 591 | .name = "UNIX", |
| 592 | .owner = THIS_MODULE, |
Eric Dumazet | 248969a | 2008-11-17 00:00:30 -0800 | [diff] [blame] | 593 | .obj_size = sizeof(struct unix_sock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | }; |
| 595 | |
Ingo Molnar | a09785a | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 596 | /* |
| 597 | * AF_UNIX sockets do not interact with hardware, hence they |
| 598 | * dont trigger interrupts - so it's safe for them to have |
| 599 | * bh-unsafe locking for their sk_receive_queue.lock. Split off |
| 600 | * this special lock-class by reinitializing the spinlock key: |
| 601 | */ |
| 602 | static struct lock_class_key af_unix_sk_receive_queue_lock_key; |
| 603 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 604 | static struct sock *unix_create1(struct net *net, struct socket *sock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | { |
| 606 | struct sock *sk = NULL; |
| 607 | struct unix_sock *u; |
| 608 | |
Pavel Emelyanov | 284b327 | 2007-11-10 22:08:30 -0800 | [diff] [blame] | 609 | atomic_inc(&unix_nr_socks); |
| 610 | if (atomic_read(&unix_nr_socks) > 2 * get_max_files()) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | goto out; |
| 612 | |
Pavel Emelyanov | 6257ff2 | 2007-11-01 00:39:31 -0700 | [diff] [blame] | 613 | sk = sk_alloc(net, PF_UNIX, GFP_KERNEL, &unix_proto); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | if (!sk) |
| 615 | goto out; |
| 616 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 617 | sock_init_data(sock, sk); |
Ingo Molnar | a09785a | 2006-07-03 00:25:12 -0700 | [diff] [blame] | 618 | lockdep_set_class(&sk->sk_receive_queue.lock, |
| 619 | &af_unix_sk_receive_queue_lock_key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
| 621 | sk->sk_write_space = unix_write_space; |
Denis V. Lunev | a0a53c8 | 2007-12-11 04:19:17 -0800 | [diff] [blame] | 622 | sk->sk_max_ack_backlog = net->unx.sysctl_max_dgram_qlen; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | sk->sk_destruct = unix_sock_destructor; |
| 624 | u = unix_sk(sk); |
| 625 | u->dentry = NULL; |
| 626 | u->mnt = NULL; |
Benjamin LaHaise | fd19f32 | 2006-01-03 14:10:46 -0800 | [diff] [blame] | 627 | spin_lock_init(&u->lock); |
Al Viro | 516e0cc | 2008-07-26 00:39:17 -0400 | [diff] [blame] | 628 | atomic_long_set(&u->inflight, 0); |
Miklos Szeredi | 1fd05ba | 2007-07-11 14:22:39 -0700 | [diff] [blame] | 629 | INIT_LIST_HEAD(&u->link); |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 630 | mutex_init(&u->readlock); /* single task reading lock */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | init_waitqueue_head(&u->peer_wait); |
| 632 | unix_insert_socket(unix_sockets_unbound, sk); |
| 633 | out: |
Pavel Emelyanov | 284b327 | 2007-11-10 22:08:30 -0800 | [diff] [blame] | 634 | if (sk == NULL) |
| 635 | atomic_dec(&unix_nr_socks); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 636 | else { |
| 637 | local_bh_disable(); |
Eric Dumazet | a8076d8 | 2008-11-17 02:38:49 -0800 | [diff] [blame] | 638 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
Eric Dumazet | 920de80 | 2008-11-24 00:09:29 -0800 | [diff] [blame] | 639 | local_bh_enable(); |
| 640 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | return sk; |
| 642 | } |
| 643 | |
Eric Paris | 3f378b6 | 2009-11-05 22:18:14 -0800 | [diff] [blame] | 644 | static int unix_create(struct net *net, struct socket *sock, int protocol, |
| 645 | int kern) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | { |
| 647 | if (protocol && protocol != PF_UNIX) |
| 648 | return -EPROTONOSUPPORT; |
| 649 | |
| 650 | sock->state = SS_UNCONNECTED; |
| 651 | |
| 652 | switch (sock->type) { |
| 653 | case SOCK_STREAM: |
| 654 | sock->ops = &unix_stream_ops; |
| 655 | break; |
| 656 | /* |
| 657 | * Believe it or not BSD has AF_UNIX, SOCK_RAW though |
| 658 | * nothing uses it. |
| 659 | */ |
| 660 | case SOCK_RAW: |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 661 | sock->type = SOCK_DGRAM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | case SOCK_DGRAM: |
| 663 | sock->ops = &unix_dgram_ops; |
| 664 | break; |
| 665 | case SOCK_SEQPACKET: |
| 666 | sock->ops = &unix_seqpacket_ops; |
| 667 | break; |
| 668 | default: |
| 669 | return -ESOCKTNOSUPPORT; |
| 670 | } |
| 671 | |
Eric W. Biederman | 1b8d7ae | 2007-10-08 23:24:22 -0700 | [diff] [blame] | 672 | return unix_create1(net, sock) ? 0 : -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
| 675 | static int unix_release(struct socket *sock) |
| 676 | { |
| 677 | struct sock *sk = sock->sk; |
| 678 | |
| 679 | if (!sk) |
| 680 | return 0; |
| 681 | |
| 682 | sock->sk = NULL; |
| 683 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 684 | return unix_release_sock(sk, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
| 687 | static int unix_autobind(struct socket *sock) |
| 688 | { |
| 689 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 690 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | struct unix_sock *u = unix_sk(sk); |
| 692 | static u32 ordernum = 1; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 693 | struct unix_address *addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 694 | int err; |
Tetsuo Handa | 8df73ff | 2010-09-04 01:34:28 +0000 | [diff] [blame^] | 695 | unsigned int retries = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 697 | mutex_lock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | |
| 699 | err = 0; |
| 700 | if (u->addr) |
| 701 | goto out; |
| 702 | |
| 703 | err = -ENOMEM; |
Panagiotis Issaris | 0da974f | 2006-07-21 14:51:30 -0700 | [diff] [blame] | 704 | addr = kzalloc(sizeof(*addr) + sizeof(short) + 16, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (!addr) |
| 706 | goto out; |
| 707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | addr->name->sun_family = AF_UNIX; |
| 709 | atomic_set(&addr->refcnt, 1); |
| 710 | |
| 711 | retry: |
| 712 | 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] | 713 | addr->hash = unix_hash_fold(csum_partial(addr->name, addr->len, 0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 715 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | ordernum = (ordernum+1)&0xFFFFF; |
| 717 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 718 | if (__unix_find_socket_byname(net, addr->name, addr->len, sock->type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | addr->hash)) { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 720 | spin_unlock(&unix_table_lock); |
Tetsuo Handa | 8df73ff | 2010-09-04 01:34:28 +0000 | [diff] [blame^] | 721 | /* |
| 722 | * __unix_find_socket_byname() may take long time if many names |
| 723 | * are already in use. |
| 724 | */ |
| 725 | cond_resched(); |
| 726 | /* Give up if all names seems to be in use. */ |
| 727 | if (retries++ == 0xFFFFF) { |
| 728 | err = -ENOSPC; |
| 729 | kfree(addr); |
| 730 | goto out; |
| 731 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | goto retry; |
| 733 | } |
| 734 | addr->hash ^= sk->sk_type; |
| 735 | |
| 736 | __unix_remove_socket(sk); |
| 737 | u->addr = addr; |
| 738 | __unix_insert_socket(&unix_socket_table[addr->hash], sk); |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 739 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | err = 0; |
| 741 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 742 | out: mutex_unlock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | return err; |
| 744 | } |
| 745 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 746 | static struct sock *unix_find_other(struct net *net, |
| 747 | struct sockaddr_un *sunname, int len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 748 | int type, unsigned hash, int *error) |
| 749 | { |
| 750 | struct sock *u; |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 751 | struct path path; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | int err = 0; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | if (sunname->sun_path[0]) { |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 755 | struct inode *inode; |
| 756 | err = kern_path(sunname->sun_path, LOOKUP_FOLLOW, &path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | if (err) |
| 758 | goto fail; |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 759 | inode = path.dentry->d_inode; |
| 760 | err = inode_permission(inode, MAY_WRITE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | if (err) |
| 762 | goto put_fail; |
| 763 | |
| 764 | err = -ECONNREFUSED; |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 765 | if (!S_ISSOCK(inode->i_mode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | goto put_fail; |
Eric W. Biederman | 6616f78 | 2010-06-13 03:35:48 +0000 | [diff] [blame] | 767 | u = unix_find_socket_byinode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | if (!u) |
| 769 | goto put_fail; |
| 770 | |
| 771 | if (u->sk_type == type) |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 772 | touch_atime(path.mnt, path.dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 774 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 776 | err = -EPROTOTYPE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | if (u->sk_type != type) { |
| 778 | sock_put(u); |
| 779 | goto fail; |
| 780 | } |
| 781 | } else { |
| 782 | err = -ECONNREFUSED; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 783 | u = unix_find_socket_byname(net, sunname, len, type, hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 784 | if (u) { |
| 785 | struct dentry *dentry; |
| 786 | dentry = unix_sk(u)->dentry; |
| 787 | if (dentry) |
| 788 | touch_atime(unix_sk(u)->mnt, dentry); |
| 789 | } else |
| 790 | goto fail; |
| 791 | } |
| 792 | return u; |
| 793 | |
| 794 | put_fail: |
Al Viro | 421748e | 2008-08-02 01:04:36 -0400 | [diff] [blame] | 795 | path_put(&path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | fail: |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 797 | *error = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | return NULL; |
| 799 | } |
| 800 | |
| 801 | |
| 802 | static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
| 803 | { |
| 804 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 805 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | struct unix_sock *u = unix_sk(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 807 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 808 | struct dentry *dentry = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | struct nameidata nd; |
| 810 | int err; |
| 811 | unsigned hash; |
| 812 | struct unix_address *addr; |
| 813 | struct hlist_head *list; |
| 814 | |
| 815 | err = -EINVAL; |
| 816 | if (sunaddr->sun_family != AF_UNIX) |
| 817 | goto out; |
| 818 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 819 | if (addr_len == sizeof(short)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | err = unix_autobind(sock); |
| 821 | goto out; |
| 822 | } |
| 823 | |
| 824 | err = unix_mkname(sunaddr, addr_len, &hash); |
| 825 | if (err < 0) |
| 826 | goto out; |
| 827 | addr_len = err; |
| 828 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 829 | mutex_lock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
| 831 | err = -EINVAL; |
| 832 | if (u->addr) |
| 833 | goto out_up; |
| 834 | |
| 835 | err = -ENOMEM; |
| 836 | addr = kmalloc(sizeof(*addr)+addr_len, GFP_KERNEL); |
| 837 | if (!addr) |
| 838 | goto out_up; |
| 839 | |
| 840 | memcpy(addr->name, sunaddr, addr_len); |
| 841 | addr->len = addr_len; |
| 842 | addr->hash = hash ^ sk->sk_type; |
| 843 | atomic_set(&addr->refcnt, 1); |
| 844 | |
| 845 | if (sunaddr->sun_path[0]) { |
| 846 | unsigned int mode; |
| 847 | err = 0; |
| 848 | /* |
| 849 | * Get the parent directory, calculate the hash for last |
| 850 | * component. |
| 851 | */ |
| 852 | err = path_lookup(sunaddr->sun_path, LOOKUP_PARENT, &nd); |
| 853 | if (err) |
| 854 | goto out_mknod_parent; |
Christoph Hellwig | f81a0bf | 2005-05-19 12:26:43 -0700 | [diff] [blame] | 855 | |
| 856 | dentry = lookup_create(&nd, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | err = PTR_ERR(dentry); |
| 858 | if (IS_ERR(dentry)) |
| 859 | goto out_mknod_unlock; |
Christoph Hellwig | f81a0bf | 2005-05-19 12:26:43 -0700 | [diff] [blame] | 860 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | /* |
| 862 | * All right, let's create it. |
| 863 | */ |
| 864 | mode = S_IFSOCK | |
Al Viro | ce3b0f8 | 2009-03-29 19:08:22 -0400 | [diff] [blame] | 865 | (SOCK_INODE(sock)->i_mode & ~current_umask()); |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 866 | err = mnt_want_write(nd.path.mnt); |
| 867 | if (err) |
| 868 | goto out_mknod_dput; |
Kentaro Takeda | be6d3e5 | 2008-12-17 13:24:15 +0900 | [diff] [blame] | 869 | err = security_path_mknod(&nd.path, dentry, mode, 0); |
| 870 | if (err) |
| 871 | goto out_mknod_drop_write; |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 872 | err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0); |
Kentaro Takeda | be6d3e5 | 2008-12-17 13:24:15 +0900 | [diff] [blame] | 873 | out_mknod_drop_write: |
Dave Hansen | 463c319 | 2008-02-15 14:37:57 -0800 | [diff] [blame] | 874 | mnt_drop_write(nd.path.mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | if (err) |
| 876 | goto out_mknod_dput; |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 877 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
| 878 | dput(nd.path.dentry); |
| 879 | nd.path.dentry = dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | |
| 881 | addr->hash = UNIX_HASH_SIZE; |
| 882 | } |
| 883 | |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 884 | spin_lock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | if (!sunaddr->sun_path[0]) { |
| 887 | err = -EADDRINUSE; |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 888 | if (__unix_find_socket_byname(net, sunaddr, addr_len, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 889 | sk->sk_type, hash)) { |
| 890 | unix_release_addr(addr); |
| 891 | goto out_unlock; |
| 892 | } |
| 893 | |
| 894 | list = &unix_socket_table[addr->hash]; |
| 895 | } else { |
| 896 | list = &unix_socket_table[dentry->d_inode->i_ino & (UNIX_HASH_SIZE-1)]; |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 897 | u->dentry = nd.path.dentry; |
| 898 | u->mnt = nd.path.mnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | err = 0; |
| 902 | __unix_remove_socket(sk); |
| 903 | u->addr = addr; |
| 904 | __unix_insert_socket(list, sk); |
| 905 | |
| 906 | out_unlock: |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 907 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | out_up: |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 909 | mutex_unlock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | out: |
| 911 | return err; |
| 912 | |
| 913 | out_mknod_dput: |
| 914 | dput(dentry); |
| 915 | out_mknod_unlock: |
Jan Blunck | 4ac9137 | 2008-02-14 19:34:32 -0800 | [diff] [blame] | 916 | mutex_unlock(&nd.path.dentry->d_inode->i_mutex); |
Jan Blunck | 1d957f9 | 2008-02-14 19:34:35 -0800 | [diff] [blame] | 917 | path_put(&nd.path); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | out_mknod_parent: |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 919 | if (err == -EEXIST) |
| 920 | err = -EADDRINUSE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | unix_release_addr(addr); |
| 922 | goto out_up; |
| 923 | } |
| 924 | |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 925 | static void unix_state_double_lock(struct sock *sk1, struct sock *sk2) |
| 926 | { |
| 927 | if (unlikely(sk1 == sk2) || !sk2) { |
| 928 | unix_state_lock(sk1); |
| 929 | return; |
| 930 | } |
| 931 | if (sk1 < sk2) { |
| 932 | unix_state_lock(sk1); |
| 933 | unix_state_lock_nested(sk2); |
| 934 | } else { |
| 935 | unix_state_lock(sk2); |
| 936 | unix_state_lock_nested(sk1); |
| 937 | } |
| 938 | } |
| 939 | |
| 940 | static void unix_state_double_unlock(struct sock *sk1, struct sock *sk2) |
| 941 | { |
| 942 | if (unlikely(sk1 == sk2) || !sk2) { |
| 943 | unix_state_unlock(sk1); |
| 944 | return; |
| 945 | } |
| 946 | unix_state_unlock(sk1); |
| 947 | unix_state_unlock(sk2); |
| 948 | } |
| 949 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 950 | static int unix_dgram_connect(struct socket *sock, struct sockaddr *addr, |
| 951 | int alen, int flags) |
| 952 | { |
| 953 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 954 | struct net *net = sock_net(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 955 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)addr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 956 | struct sock *other; |
| 957 | unsigned hash; |
| 958 | int err; |
| 959 | |
| 960 | if (addr->sa_family != AF_UNSPEC) { |
| 961 | err = unix_mkname(sunaddr, alen, &hash); |
| 962 | if (err < 0) |
| 963 | goto out; |
| 964 | alen = err; |
| 965 | |
| 966 | if (test_bit(SOCK_PASSCRED, &sock->flags) && |
| 967 | !unix_sk(sk)->addr && (err = unix_autobind(sock)) != 0) |
| 968 | goto out; |
| 969 | |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 970 | restart: |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 971 | other = unix_find_other(net, sunaddr, alen, sock->type, hash, &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | if (!other) |
| 973 | goto out; |
| 974 | |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 975 | unix_state_double_lock(sk, other); |
| 976 | |
| 977 | /* Apparently VFS overslept socket death. Retry. */ |
| 978 | if (sock_flag(other, SOCK_DEAD)) { |
| 979 | unix_state_double_unlock(sk, other); |
| 980 | sock_put(other); |
| 981 | goto restart; |
| 982 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | |
| 984 | err = -EPERM; |
| 985 | if (!unix_may_send(sk, other)) |
| 986 | goto out_unlock; |
| 987 | |
| 988 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); |
| 989 | if (err) |
| 990 | goto out_unlock; |
| 991 | |
| 992 | } else { |
| 993 | /* |
| 994 | * 1003.1g breaking connected state with AF_UNSPEC |
| 995 | */ |
| 996 | other = NULL; |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 997 | unix_state_double_lock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | } |
| 999 | |
| 1000 | /* |
| 1001 | * If it was connected, reconnect. |
| 1002 | */ |
| 1003 | if (unix_peer(sk)) { |
| 1004 | struct sock *old_peer = unix_peer(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1005 | unix_peer(sk) = other; |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1006 | unix_state_double_unlock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | |
| 1008 | if (other != old_peer) |
| 1009 | unix_dgram_disconnected(sk, old_peer); |
| 1010 | sock_put(old_peer); |
| 1011 | } else { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1012 | unix_peer(sk) = other; |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1013 | unix_state_double_unlock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | } |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1015 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | |
| 1017 | out_unlock: |
David S. Miller | 278a3de | 2007-05-31 15:19:20 -0700 | [diff] [blame] | 1018 | unix_state_double_unlock(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | sock_put(other); |
| 1020 | out: |
| 1021 | return err; |
| 1022 | } |
| 1023 | |
| 1024 | static long unix_wait_for_peer(struct sock *other, long timeo) |
| 1025 | { |
| 1026 | struct unix_sock *u = unix_sk(other); |
| 1027 | int sched; |
| 1028 | DEFINE_WAIT(wait); |
| 1029 | |
| 1030 | prepare_to_wait_exclusive(&u->peer_wait, &wait, TASK_INTERRUPTIBLE); |
| 1031 | |
| 1032 | sched = !sock_flag(other, SOCK_DEAD) && |
| 1033 | !(other->sk_shutdown & RCV_SHUTDOWN) && |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 1034 | unix_recvq_full(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1036 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
| 1038 | if (sched) |
| 1039 | timeo = schedule_timeout(timeo); |
| 1040 | |
| 1041 | finish_wait(&u->peer_wait, &wait); |
| 1042 | return timeo; |
| 1043 | } |
| 1044 | |
| 1045 | static int unix_stream_connect(struct socket *sock, struct sockaddr *uaddr, |
| 1046 | int addr_len, int flags) |
| 1047 | { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1048 | struct sockaddr_un *sunaddr = (struct sockaddr_un *)uaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1050 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | struct unix_sock *u = unix_sk(sk), *newu, *otheru; |
| 1052 | struct sock *newsk = NULL; |
| 1053 | struct sock *other = NULL; |
| 1054 | struct sk_buff *skb = NULL; |
| 1055 | unsigned hash; |
| 1056 | int st; |
| 1057 | int err; |
| 1058 | long timeo; |
| 1059 | |
| 1060 | err = unix_mkname(sunaddr, addr_len, &hash); |
| 1061 | if (err < 0) |
| 1062 | goto out; |
| 1063 | addr_len = err; |
| 1064 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1065 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr && |
| 1066 | (err = unix_autobind(sock)) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1067 | goto out; |
| 1068 | |
| 1069 | timeo = sock_sndtimeo(sk, flags & O_NONBLOCK); |
| 1070 | |
| 1071 | /* First of all allocate resources. |
| 1072 | If we will make it after state is locked, |
| 1073 | we will have to recheck all again in any case. |
| 1074 | */ |
| 1075 | |
| 1076 | err = -ENOMEM; |
| 1077 | |
| 1078 | /* create new sock for complete connection */ |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1079 | newsk = unix_create1(sock_net(sk), NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1080 | if (newsk == NULL) |
| 1081 | goto out; |
| 1082 | |
| 1083 | /* Allocate skb for sending to listening sock */ |
| 1084 | skb = sock_wmalloc(newsk, 1, 0, GFP_KERNEL); |
| 1085 | if (skb == NULL) |
| 1086 | goto out; |
| 1087 | |
| 1088 | restart: |
| 1089 | /* Find listening sock. */ |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 1090 | 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] | 1091 | if (!other) |
| 1092 | goto out; |
| 1093 | |
| 1094 | /* Latch state of peer */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1095 | unix_state_lock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | |
| 1097 | /* Apparently VFS overslept socket death. Retry. */ |
| 1098 | if (sock_flag(other, SOCK_DEAD)) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1099 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1100 | sock_put(other); |
| 1101 | goto restart; |
| 1102 | } |
| 1103 | |
| 1104 | err = -ECONNREFUSED; |
| 1105 | if (other->sk_state != TCP_LISTEN) |
| 1106 | goto out_unlock; |
Tomoki Sekiyama | 77238f2 | 2009-10-18 23:17:37 -0700 | [diff] [blame] | 1107 | if (other->sk_shutdown & RCV_SHUTDOWN) |
| 1108 | goto out_unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 1110 | if (unix_recvq_full(other)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | err = -EAGAIN; |
| 1112 | if (!timeo) |
| 1113 | goto out_unlock; |
| 1114 | |
| 1115 | timeo = unix_wait_for_peer(other, timeo); |
| 1116 | |
| 1117 | err = sock_intr_errno(timeo); |
| 1118 | if (signal_pending(current)) |
| 1119 | goto out; |
| 1120 | sock_put(other); |
| 1121 | goto restart; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1122 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | |
| 1124 | /* Latch our state. |
| 1125 | |
| 1126 | It is tricky place. We need to grab write lock and cannot |
| 1127 | drop lock on peer. It is dangerous because deadlock is |
| 1128 | possible. Connect to self case and simultaneous |
| 1129 | attempt to connect are eliminated by checking socket |
| 1130 | state. other is TCP_LISTEN, if sk is TCP_LISTEN we |
| 1131 | check this before attempt to grab lock. |
| 1132 | |
| 1133 | Well, and we have to recheck the state after socket locked. |
| 1134 | */ |
| 1135 | st = sk->sk_state; |
| 1136 | |
| 1137 | switch (st) { |
| 1138 | case TCP_CLOSE: |
| 1139 | /* This is ok... continue with connect */ |
| 1140 | break; |
| 1141 | case TCP_ESTABLISHED: |
| 1142 | /* Socket is already connected */ |
| 1143 | err = -EISCONN; |
| 1144 | goto out_unlock; |
| 1145 | default: |
| 1146 | err = -EINVAL; |
| 1147 | goto out_unlock; |
| 1148 | } |
| 1149 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1150 | unix_state_lock_nested(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1151 | |
| 1152 | if (sk->sk_state != st) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1153 | unix_state_unlock(sk); |
| 1154 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | sock_put(other); |
| 1156 | goto restart; |
| 1157 | } |
| 1158 | |
| 1159 | err = security_unix_stream_connect(sock, other->sk_socket, newsk); |
| 1160 | if (err) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1161 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | goto out_unlock; |
| 1163 | } |
| 1164 | |
| 1165 | /* The way is open! Fastly set all the necessary fields... */ |
| 1166 | |
| 1167 | sock_hold(sk); |
| 1168 | unix_peer(newsk) = sk; |
| 1169 | newsk->sk_state = TCP_ESTABLISHED; |
| 1170 | newsk->sk_type = sk->sk_type; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1171 | init_peercred(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | newu = unix_sk(newsk); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1173 | newsk->sk_wq = &newu->peer_wq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | otheru = unix_sk(other); |
| 1175 | |
| 1176 | /* copy address information from listening to new sock*/ |
| 1177 | if (otheru->addr) { |
| 1178 | atomic_inc(&otheru->addr->refcnt); |
| 1179 | newu->addr = otheru->addr; |
| 1180 | } |
| 1181 | if (otheru->dentry) { |
| 1182 | newu->dentry = dget(otheru->dentry); |
| 1183 | newu->mnt = mntget(otheru->mnt); |
| 1184 | } |
| 1185 | |
| 1186 | /* Set credentials */ |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1187 | copy_peercred(sk, other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | sock->state = SS_CONNECTED; |
| 1190 | sk->sk_state = TCP_ESTABLISHED; |
Benjamin LaHaise | 830a1e5 | 2005-12-13 23:22:32 -0800 | [diff] [blame] | 1191 | sock_hold(newsk); |
| 1192 | |
| 1193 | smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ |
| 1194 | unix_peer(sk) = newsk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1196 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | |
| 1198 | /* take ten and and send info to listening sock */ |
| 1199 | spin_lock(&other->sk_receive_queue.lock); |
| 1200 | __skb_queue_tail(&other->sk_receive_queue, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1201 | spin_unlock(&other->sk_receive_queue.lock); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1202 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | other->sk_data_ready(other, 0); |
| 1204 | sock_put(other); |
| 1205 | return 0; |
| 1206 | |
| 1207 | out_unlock: |
| 1208 | if (other) |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1209 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1210 | |
| 1211 | out: |
Wei Yongjun | 40d4444 | 2009-02-25 00:32:45 +0000 | [diff] [blame] | 1212 | kfree_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | if (newsk) |
| 1214 | unix_release_sock(newsk, 0); |
| 1215 | if (other) |
| 1216 | sock_put(other); |
| 1217 | return err; |
| 1218 | } |
| 1219 | |
| 1220 | static int unix_socketpair(struct socket *socka, struct socket *sockb) |
| 1221 | { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1222 | struct sock *ska = socka->sk, *skb = sockb->sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | |
| 1224 | /* Join our sockets back to back */ |
| 1225 | sock_hold(ska); |
| 1226 | sock_hold(skb); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1227 | unix_peer(ska) = skb; |
| 1228 | unix_peer(skb) = ska; |
Eric W. Biederman | 109f6e3 | 2010-06-13 03:30:14 +0000 | [diff] [blame] | 1229 | init_peercred(ska); |
| 1230 | init_peercred(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | |
| 1232 | if (ska->sk_type != SOCK_DGRAM) { |
| 1233 | ska->sk_state = TCP_ESTABLISHED; |
| 1234 | skb->sk_state = TCP_ESTABLISHED; |
| 1235 | socka->state = SS_CONNECTED; |
| 1236 | sockb->state = SS_CONNECTED; |
| 1237 | } |
| 1238 | return 0; |
| 1239 | } |
| 1240 | |
| 1241 | static int unix_accept(struct socket *sock, struct socket *newsock, int flags) |
| 1242 | { |
| 1243 | struct sock *sk = sock->sk; |
| 1244 | struct sock *tsk; |
| 1245 | struct sk_buff *skb; |
| 1246 | int err; |
| 1247 | |
| 1248 | err = -EOPNOTSUPP; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1249 | if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | goto out; |
| 1251 | |
| 1252 | err = -EINVAL; |
| 1253 | if (sk->sk_state != TCP_LISTEN) |
| 1254 | goto out; |
| 1255 | |
| 1256 | /* If socket state is TCP_LISTEN it cannot change (for now...), |
| 1257 | * so that no locks are necessary. |
| 1258 | */ |
| 1259 | |
| 1260 | skb = skb_recv_datagram(sk, 0, flags&O_NONBLOCK, &err); |
| 1261 | if (!skb) { |
| 1262 | /* This means receive shutdown. */ |
| 1263 | if (err == 0) |
| 1264 | err = -EINVAL; |
| 1265 | goto out; |
| 1266 | } |
| 1267 | |
| 1268 | tsk = skb->sk; |
| 1269 | skb_free_datagram(sk, skb); |
| 1270 | wake_up_interruptible(&unix_sk(sk)->peer_wait); |
| 1271 | |
| 1272 | /* attach accepted sock to socket */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1273 | unix_state_lock(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | newsock->state = SS_CONNECTED; |
| 1275 | sock_graft(tsk, newsock); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1276 | unix_state_unlock(tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1277 | return 0; |
| 1278 | |
| 1279 | out: |
| 1280 | return err; |
| 1281 | } |
| 1282 | |
| 1283 | |
| 1284 | static int unix_getname(struct socket *sock, struct sockaddr *uaddr, int *uaddr_len, int peer) |
| 1285 | { |
| 1286 | struct sock *sk = sock->sk; |
| 1287 | struct unix_sock *u; |
Cyrill Gorcunov | 13cfa97 | 2009-11-08 05:51:19 +0000 | [diff] [blame] | 1288 | DECLARE_SOCKADDR(struct sockaddr_un *, sunaddr, uaddr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | int err = 0; |
| 1290 | |
| 1291 | if (peer) { |
| 1292 | sk = unix_peer_get(sk); |
| 1293 | |
| 1294 | err = -ENOTCONN; |
| 1295 | if (!sk) |
| 1296 | goto out; |
| 1297 | err = 0; |
| 1298 | } else { |
| 1299 | sock_hold(sk); |
| 1300 | } |
| 1301 | |
| 1302 | u = unix_sk(sk); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1303 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1304 | if (!u->addr) { |
| 1305 | sunaddr->sun_family = AF_UNIX; |
| 1306 | sunaddr->sun_path[0] = 0; |
| 1307 | *uaddr_len = sizeof(short); |
| 1308 | } else { |
| 1309 | struct unix_address *addr = u->addr; |
| 1310 | |
| 1311 | *uaddr_len = addr->len; |
| 1312 | memcpy(sunaddr, addr->name, *uaddr_len); |
| 1313 | } |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1314 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1315 | sock_put(sk); |
| 1316 | out: |
| 1317 | return err; |
| 1318 | } |
| 1319 | |
| 1320 | static void unix_detach_fds(struct scm_cookie *scm, struct sk_buff *skb) |
| 1321 | { |
| 1322 | int i; |
| 1323 | |
| 1324 | scm->fp = UNIXCB(skb).fp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1325 | UNIXCB(skb).fp = NULL; |
| 1326 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1327 | for (i = scm->fp->count-1; i >= 0; i--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | unix_notinflight(scm->fp->fp[i]); |
| 1329 | } |
| 1330 | |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1331 | static void unix_destruct_scm(struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1332 | { |
| 1333 | struct scm_cookie scm; |
| 1334 | memset(&scm, 0, sizeof(scm)); |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1335 | scm.pid = UNIXCB(skb).pid; |
| 1336 | scm.cred = UNIXCB(skb).cred; |
| 1337 | if (UNIXCB(skb).fp) |
| 1338 | unix_detach_fds(&scm, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
| 1340 | /* Alas, it calls VFS */ |
| 1341 | /* So fscking what? fput() had been SMP-safe since the last Summer */ |
| 1342 | scm_destroy(&scm); |
| 1343 | sock_wfree(skb); |
| 1344 | } |
| 1345 | |
Miklos Szeredi | 6209344 | 2008-11-09 15:23:57 +0100 | [diff] [blame] | 1346 | 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] | 1347 | { |
| 1348 | int i; |
Miklos Szeredi | 6209344 | 2008-11-09 15:23:57 +0100 | [diff] [blame] | 1349 | |
| 1350 | /* |
| 1351 | * Need to duplicate file references for the sake of garbage |
| 1352 | * collection. Otherwise a socket in the fps might become a |
| 1353 | * candidate for GC while the skb is not yet queued. |
| 1354 | */ |
| 1355 | UNIXCB(skb).fp = scm_fp_dup(scm->fp); |
| 1356 | if (!UNIXCB(skb).fp) |
| 1357 | return -ENOMEM; |
| 1358 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1359 | for (i = scm->fp->count-1; i >= 0; i--) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | unix_inflight(scm->fp->fp[i]); |
Miklos Szeredi | 6209344 | 2008-11-09 15:23:57 +0100 | [diff] [blame] | 1361 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1362 | } |
| 1363 | |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1364 | static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds) |
| 1365 | { |
| 1366 | int err = 0; |
| 1367 | UNIXCB(skb).pid = get_pid(scm->pid); |
| 1368 | UNIXCB(skb).cred = get_cred(scm->cred); |
| 1369 | UNIXCB(skb).fp = NULL; |
| 1370 | if (scm->fp && send_fds) |
| 1371 | err = unix_attach_fds(scm, skb); |
| 1372 | |
| 1373 | skb->destructor = unix_destruct_scm; |
| 1374 | return err; |
| 1375 | } |
| 1376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | /* |
| 1378 | * Send AF_UNIX data. |
| 1379 | */ |
| 1380 | |
| 1381 | static int unix_dgram_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 1382 | struct msghdr *msg, size_t len) |
| 1383 | { |
| 1384 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1385 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 1386 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1387 | struct unix_sock *u = unix_sk(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1388 | struct sockaddr_un *sunaddr = msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1389 | struct sock *other = NULL; |
| 1390 | int namelen = 0; /* fake GCC */ |
| 1391 | int err; |
| 1392 | unsigned hash; |
| 1393 | struct sk_buff *skb; |
| 1394 | long timeo; |
| 1395 | struct scm_cookie tmp_scm; |
| 1396 | |
| 1397 | if (NULL == siocb->scm) |
| 1398 | siocb->scm = &tmp_scm; |
dann frazier | 5f23b73 | 2008-11-26 15:32:27 -0800 | [diff] [blame] | 1399 | wait_for_unix_gc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | err = scm_send(sock, msg, siocb->scm); |
| 1401 | if (err < 0) |
| 1402 | return err; |
| 1403 | |
| 1404 | err = -EOPNOTSUPP; |
| 1405 | if (msg->msg_flags&MSG_OOB) |
| 1406 | goto out; |
| 1407 | |
| 1408 | if (msg->msg_namelen) { |
| 1409 | err = unix_mkname(sunaddr, msg->msg_namelen, &hash); |
| 1410 | if (err < 0) |
| 1411 | goto out; |
| 1412 | namelen = err; |
| 1413 | } else { |
| 1414 | sunaddr = NULL; |
| 1415 | err = -ENOTCONN; |
| 1416 | other = unix_peer_get(sk); |
| 1417 | if (!other) |
| 1418 | goto out; |
| 1419 | } |
| 1420 | |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 1421 | if (test_bit(SOCK_PASSCRED, &sock->flags) && !u->addr |
| 1422 | && (err = unix_autobind(sock)) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | goto out; |
| 1424 | |
| 1425 | err = -EMSGSIZE; |
| 1426 | if (len > sk->sk_sndbuf - 32) |
| 1427 | goto out; |
| 1428 | |
| 1429 | skb = sock_alloc_send_skb(sk, len, msg->msg_flags&MSG_DONTWAIT, &err); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1430 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1431 | goto out; |
| 1432 | |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1433 | err = unix_scm_to_skb(siocb->scm, skb, true); |
| 1434 | if (err) |
| 1435 | goto out_free; |
Catherine Zhang | dc49c1f | 2006-08-02 14:12:06 -0700 | [diff] [blame] | 1436 | unix_get_secdata(siocb->scm, skb); |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 1437 | |
Arnaldo Carvalho de Melo | badff6d | 2007-03-13 13:06:52 -0300 | [diff] [blame] | 1438 | skb_reset_transport_header(skb); |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1439 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | if (err) |
| 1441 | goto out_free; |
| 1442 | |
| 1443 | timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT); |
| 1444 | |
| 1445 | restart: |
| 1446 | if (!other) { |
| 1447 | err = -ECONNRESET; |
| 1448 | if (sunaddr == NULL) |
| 1449 | goto out_free; |
| 1450 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 1451 | other = unix_find_other(net, sunaddr, namelen, sk->sk_type, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | hash, &err); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1453 | if (other == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | goto out_free; |
| 1455 | } |
| 1456 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1457 | unix_state_lock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | err = -EPERM; |
| 1459 | if (!unix_may_send(sk, other)) |
| 1460 | goto out_unlock; |
| 1461 | |
| 1462 | if (sock_flag(other, SOCK_DEAD)) { |
| 1463 | /* |
| 1464 | * Check with 1003.1g - what should |
| 1465 | * datagram error |
| 1466 | */ |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1467 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1468 | sock_put(other); |
| 1469 | |
| 1470 | err = 0; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1471 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | if (unix_peer(sk) == other) { |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1473 | unix_peer(sk) = NULL; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1474 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | |
| 1476 | unix_dgram_disconnected(sk, other); |
| 1477 | sock_put(other); |
| 1478 | err = -ECONNREFUSED; |
| 1479 | } else { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1480 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | } |
| 1482 | |
| 1483 | other = NULL; |
| 1484 | if (err) |
| 1485 | goto out_free; |
| 1486 | goto restart; |
| 1487 | } |
| 1488 | |
| 1489 | err = -EPIPE; |
| 1490 | if (other->sk_shutdown & RCV_SHUTDOWN) |
| 1491 | goto out_unlock; |
| 1492 | |
| 1493 | if (sk->sk_type != SOCK_SEQPACKET) { |
| 1494 | err = security_unix_may_send(sk->sk_socket, other->sk_socket); |
| 1495 | if (err) |
| 1496 | goto out_unlock; |
| 1497 | } |
| 1498 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 1499 | if (unix_peer(other) != sk && unix_recvq_full(other)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1500 | if (!timeo) { |
| 1501 | err = -EAGAIN; |
| 1502 | goto out_unlock; |
| 1503 | } |
| 1504 | |
| 1505 | timeo = unix_wait_for_peer(other, timeo); |
| 1506 | |
| 1507 | err = sock_intr_errno(timeo); |
| 1508 | if (signal_pending(current)) |
| 1509 | goto out_free; |
| 1510 | |
| 1511 | goto restart; |
| 1512 | } |
| 1513 | |
| 1514 | skb_queue_tail(&other->sk_receive_queue, skb); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1515 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | other->sk_data_ready(other, len); |
| 1517 | sock_put(other); |
| 1518 | scm_destroy(siocb->scm); |
| 1519 | return len; |
| 1520 | |
| 1521 | out_unlock: |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1522 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1523 | out_free: |
| 1524 | kfree_skb(skb); |
| 1525 | out: |
| 1526 | if (other) |
| 1527 | sock_put(other); |
| 1528 | scm_destroy(siocb->scm); |
| 1529 | return err; |
| 1530 | } |
| 1531 | |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 1534 | struct msghdr *msg, size_t len) |
| 1535 | { |
| 1536 | struct sock_iocb *siocb = kiocb_to_siocb(kiocb); |
| 1537 | struct sock *sk = sock->sk; |
| 1538 | struct sock *other = NULL; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1539 | struct sockaddr_un *sunaddr = msg->msg_name; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1540 | int err, size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | struct sk_buff *skb; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1542 | int sent = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1543 | struct scm_cookie tmp_scm; |
Miklos Szeredi | 8ba69ba | 2009-09-11 11:31:45 -0700 | [diff] [blame] | 1544 | bool fds_sent = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1545 | |
| 1546 | if (NULL == siocb->scm) |
| 1547 | siocb->scm = &tmp_scm; |
dann frazier | 5f23b73 | 2008-11-26 15:32:27 -0800 | [diff] [blame] | 1548 | wait_for_unix_gc(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | err = scm_send(sock, msg, siocb->scm); |
| 1550 | if (err < 0) |
| 1551 | return err; |
| 1552 | |
| 1553 | err = -EOPNOTSUPP; |
| 1554 | if (msg->msg_flags&MSG_OOB) |
| 1555 | goto out_err; |
| 1556 | |
| 1557 | if (msg->msg_namelen) { |
| 1558 | err = sk->sk_state == TCP_ESTABLISHED ? -EISCONN : -EOPNOTSUPP; |
| 1559 | goto out_err; |
| 1560 | } else { |
| 1561 | sunaddr = NULL; |
| 1562 | err = -ENOTCONN; |
Benjamin LaHaise | 830a1e5 | 2005-12-13 23:22:32 -0800 | [diff] [blame] | 1563 | other = unix_peer(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1564 | if (!other) |
| 1565 | goto out_err; |
| 1566 | } |
| 1567 | |
| 1568 | if (sk->sk_shutdown & SEND_SHUTDOWN) |
| 1569 | goto pipe_err; |
| 1570 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1571 | while (sent < len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1572 | /* |
Benjamin LaHaise | e9df7d7f | 2006-03-20 21:29:05 -0800 | [diff] [blame] | 1573 | * Optimisation for the fact that under 0.01% of X |
| 1574 | * messages typically need breaking up. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | */ |
| 1576 | |
Benjamin LaHaise | e9df7d7f | 2006-03-20 21:29:05 -0800 | [diff] [blame] | 1577 | size = len-sent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1578 | |
| 1579 | /* Keep two messages in the pipe so it schedules better */ |
Benjamin LaHaise | e9df7d7f | 2006-03-20 21:29:05 -0800 | [diff] [blame] | 1580 | if (size > ((sk->sk_sndbuf >> 1) - 64)) |
| 1581 | size = (sk->sk_sndbuf >> 1) - 64; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1582 | |
| 1583 | if (size > SKB_MAX_ALLOC) |
| 1584 | size = SKB_MAX_ALLOC; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1585 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1586 | /* |
| 1587 | * Grab a buffer |
| 1588 | */ |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1589 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1590 | skb = sock_alloc_send_skb(sk, size, msg->msg_flags&MSG_DONTWAIT, |
| 1591 | &err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1592 | |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1593 | if (skb == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | goto out_err; |
| 1595 | |
| 1596 | /* |
| 1597 | * If you pass two values to the sock_alloc_send_skb |
| 1598 | * it tries to grab the large buffer with GFP_NOFS |
| 1599 | * (which can fail easily), and if it fails grab the |
| 1600 | * fallback size buffer which is under a page and will |
| 1601 | * succeed. [Alan] |
| 1602 | */ |
| 1603 | size = min_t(int, size, skb_tailroom(skb)); |
| 1604 | |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1605 | |
Miklos Szeredi | 8ba69ba | 2009-09-11 11:31:45 -0700 | [diff] [blame] | 1606 | /* Only send the fds in the first buffer */ |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1607 | err = unix_scm_to_skb(siocb->scm, skb, !fds_sent); |
| 1608 | if (err) { |
| 1609 | kfree_skb(skb); |
| 1610 | goto out_err; |
Miklos Szeredi | 6209344 | 2008-11-09 15:23:57 +0100 | [diff] [blame] | 1611 | } |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1612 | fds_sent = true; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1613 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1614 | err = memcpy_fromiovec(skb_put(skb, size), msg->msg_iov, size); |
| 1615 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1616 | kfree_skb(skb); |
| 1617 | goto out_err; |
| 1618 | } |
| 1619 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1620 | unix_state_lock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1621 | |
| 1622 | if (sock_flag(other, SOCK_DEAD) || |
| 1623 | (other->sk_shutdown & RCV_SHUTDOWN)) |
| 1624 | goto pipe_err_free; |
| 1625 | |
| 1626 | skb_queue_tail(&other->sk_receive_queue, skb); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1627 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1628 | other->sk_data_ready(other, size); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1629 | sent += size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1630 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | |
| 1632 | scm_destroy(siocb->scm); |
| 1633 | siocb->scm = NULL; |
| 1634 | |
| 1635 | return sent; |
| 1636 | |
| 1637 | pipe_err_free: |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1638 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | kfree_skb(skb); |
| 1640 | pipe_err: |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1641 | if (sent == 0 && !(msg->msg_flags&MSG_NOSIGNAL)) |
| 1642 | send_sig(SIGPIPE, current, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1643 | err = -EPIPE; |
| 1644 | out_err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1645 | scm_destroy(siocb->scm); |
| 1646 | siocb->scm = NULL; |
| 1647 | return sent ? : err; |
| 1648 | } |
| 1649 | |
| 1650 | static int unix_seqpacket_sendmsg(struct kiocb *kiocb, struct socket *sock, |
| 1651 | struct msghdr *msg, size_t len) |
| 1652 | { |
| 1653 | int err; |
| 1654 | struct sock *sk = sock->sk; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | err = sock_error(sk); |
| 1657 | if (err) |
| 1658 | return err; |
| 1659 | |
| 1660 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1661 | return -ENOTCONN; |
| 1662 | |
| 1663 | if (msg->msg_namelen) |
| 1664 | msg->msg_namelen = 0; |
| 1665 | |
| 1666 | return unix_dgram_sendmsg(kiocb, sock, msg, len); |
| 1667 | } |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1668 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1669 | static void unix_copy_addr(struct msghdr *msg, struct sock *sk) |
| 1670 | { |
| 1671 | struct unix_sock *u = unix_sk(sk); |
| 1672 | |
| 1673 | msg->msg_namelen = 0; |
| 1674 | if (u->addr) { |
| 1675 | msg->msg_namelen = u->addr->len; |
| 1676 | memcpy(msg->msg_name, u->addr->name, u->addr->len); |
| 1677 | } |
| 1678 | } |
| 1679 | |
| 1680 | static int unix_dgram_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1681 | struct msghdr *msg, size_t size, |
| 1682 | int flags) |
| 1683 | { |
| 1684 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); |
| 1685 | struct scm_cookie tmp_scm; |
| 1686 | struct sock *sk = sock->sk; |
| 1687 | struct unix_sock *u = unix_sk(sk); |
| 1688 | int noblock = flags & MSG_DONTWAIT; |
| 1689 | struct sk_buff *skb; |
| 1690 | int err; |
| 1691 | |
| 1692 | err = -EOPNOTSUPP; |
| 1693 | if (flags&MSG_OOB) |
| 1694 | goto out; |
| 1695 | |
| 1696 | msg->msg_namelen = 0; |
| 1697 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1698 | mutex_lock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1699 | |
| 1700 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
Florian Zumbiehl | 0a11225 | 2007-11-29 23:19:23 +1100 | [diff] [blame] | 1701 | if (!skb) { |
| 1702 | unix_state_lock(sk); |
| 1703 | /* Signal EOF on disconnected non-blocking SEQPACKET socket. */ |
| 1704 | if (sk->sk_type == SOCK_SEQPACKET && err == -EAGAIN && |
| 1705 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 1706 | err = 0; |
| 1707 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | goto out_unlock; |
Florian Zumbiehl | 0a11225 | 2007-11-29 23:19:23 +1100 | [diff] [blame] | 1709 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1710 | |
Ingo Molnar | 71e20f1 | 2007-10-15 17:00:19 +0200 | [diff] [blame] | 1711 | wake_up_interruptible_sync(&u->peer_wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1712 | |
| 1713 | if (msg->msg_name) |
| 1714 | unix_copy_addr(msg, skb->sk); |
| 1715 | |
| 1716 | if (size > skb->len) |
| 1717 | size = skb->len; |
| 1718 | else if (size < skb->len) |
| 1719 | msg->msg_flags |= MSG_TRUNC; |
| 1720 | |
| 1721 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, size); |
| 1722 | if (err) |
| 1723 | goto out_free; |
| 1724 | |
| 1725 | if (!siocb->scm) { |
| 1726 | siocb->scm = &tmp_scm; |
| 1727 | memset(&tmp_scm, 0, sizeof(tmp_scm)); |
| 1728 | } |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1729 | scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred); |
Catherine Zhang | 877ce7c | 2006-06-29 12:27:47 -0700 | [diff] [blame] | 1730 | unix_set_secdata(siocb->scm, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1731 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1732 | if (!(flags & MSG_PEEK)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1733 | if (UNIXCB(skb).fp) |
| 1734 | unix_detach_fds(siocb->scm, skb); |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1735 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1736 | /* It is questionable: on PEEK we could: |
| 1737 | - do not return fds - good, but too simple 8) |
| 1738 | - return fds, and do not return them on read (old strategy, |
| 1739 | apparently wrong) |
| 1740 | - clone fds (I chose it for now, it is the most universal |
| 1741 | solution) |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1742 | |
| 1743 | POSIX 1003.1g does not actually define this clearly |
| 1744 | at all. POSIX 1003.1g doesn't define a lot of things |
| 1745 | clearly however! |
| 1746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1747 | */ |
| 1748 | if (UNIXCB(skb).fp) |
| 1749 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); |
| 1750 | } |
| 1751 | err = size; |
| 1752 | |
| 1753 | scm_recv(sock, msg, siocb->scm, flags); |
| 1754 | |
| 1755 | out_free: |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1756 | skb_free_datagram(sk, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1757 | out_unlock: |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1758 | mutex_unlock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | out: |
| 1760 | return err; |
| 1761 | } |
| 1762 | |
| 1763 | /* |
| 1764 | * Sleep until data has arrive. But check for races.. |
| 1765 | */ |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1766 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1767 | static long unix_stream_data_wait(struct sock *sk, long timeo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1768 | { |
| 1769 | DEFINE_WAIT(wait); |
| 1770 | |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1771 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1772 | |
| 1773 | for (;;) { |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1774 | prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | |
David S. Miller | b03efcf | 2005-07-08 14:57:23 -0700 | [diff] [blame] | 1776 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | sk->sk_err || |
| 1778 | (sk->sk_shutdown & RCV_SHUTDOWN) || |
| 1779 | signal_pending(current) || |
| 1780 | !timeo) |
| 1781 | break; |
| 1782 | |
| 1783 | set_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1784 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | timeo = schedule_timeout(timeo); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1786 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | clear_bit(SOCK_ASYNC_WAITDATA, &sk->sk_socket->flags); |
| 1788 | } |
| 1789 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 1790 | finish_wait(sk_sleep(sk), &wait); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1791 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | return timeo; |
| 1793 | } |
| 1794 | |
| 1795 | |
| 1796 | |
| 1797 | static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock, |
| 1798 | struct msghdr *msg, size_t size, |
| 1799 | int flags) |
| 1800 | { |
| 1801 | struct sock_iocb *siocb = kiocb_to_siocb(iocb); |
| 1802 | struct scm_cookie tmp_scm; |
| 1803 | struct sock *sk = sock->sk; |
| 1804 | struct unix_sock *u = unix_sk(sk); |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1805 | struct sockaddr_un *sunaddr = msg->msg_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1806 | int copied = 0; |
| 1807 | int check_creds = 0; |
| 1808 | int target; |
| 1809 | int err = 0; |
| 1810 | long timeo; |
| 1811 | |
| 1812 | err = -EINVAL; |
| 1813 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1814 | goto out; |
| 1815 | |
| 1816 | err = -EOPNOTSUPP; |
| 1817 | if (flags&MSG_OOB) |
| 1818 | goto out; |
| 1819 | |
| 1820 | target = sock_rcvlowat(sk, flags&MSG_WAITALL, size); |
| 1821 | timeo = sock_rcvtimeo(sk, flags&MSG_DONTWAIT); |
| 1822 | |
| 1823 | msg->msg_namelen = 0; |
| 1824 | |
| 1825 | /* Lock the socket to prevent queue disordering |
| 1826 | * while sleeps in memcpy_tomsg |
| 1827 | */ |
| 1828 | |
| 1829 | if (!siocb->scm) { |
| 1830 | siocb->scm = &tmp_scm; |
| 1831 | memset(&tmp_scm, 0, sizeof(tmp_scm)); |
| 1832 | } |
| 1833 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1834 | mutex_lock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1836 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1837 | int chunk; |
| 1838 | struct sk_buff *skb; |
| 1839 | |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 1840 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | skb = skb_dequeue(&sk->sk_receive_queue); |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1842 | if (skb == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1843 | if (copied >= target) |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 1844 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | |
| 1846 | /* |
| 1847 | * POSIX 1003.1g mandates this order. |
| 1848 | */ |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 1849 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1850 | err = sock_error(sk); |
| 1851 | if (err) |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 1852 | goto unlock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 1854 | goto unlock; |
| 1855 | |
| 1856 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | err = -EAGAIN; |
| 1858 | if (!timeo) |
| 1859 | break; |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1860 | mutex_unlock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1861 | |
| 1862 | timeo = unix_stream_data_wait(sk, timeo); |
| 1863 | |
| 1864 | if (signal_pending(current)) { |
| 1865 | err = sock_intr_errno(timeo); |
| 1866 | goto out; |
| 1867 | } |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1868 | mutex_lock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | continue; |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 1870 | unlock: |
| 1871 | unix_state_unlock(sk); |
| 1872 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1873 | } |
Miklos Szeredi | 3c0d2f3 | 2007-06-05 13:10:29 -0700 | [diff] [blame] | 1874 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | |
| 1876 | if (check_creds) { |
| 1877 | /* Never glue messages from different writers */ |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1878 | if ((UNIXCB(skb).pid != siocb->scm->pid) || |
| 1879 | (UNIXCB(skb).cred != siocb->scm->cred)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1880 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 1881 | break; |
| 1882 | } |
| 1883 | } else { |
| 1884 | /* Copy credentials */ |
Eric W. Biederman | 7361c36 | 2010-06-13 03:34:33 +0000 | [diff] [blame] | 1885 | scm_set_cred(siocb->scm, UNIXCB(skb).pid, UNIXCB(skb).cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1886 | check_creds = 1; |
| 1887 | } |
| 1888 | |
| 1889 | /* Copy address just once */ |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1890 | if (sunaddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | unix_copy_addr(msg, skb->sk); |
| 1892 | sunaddr = NULL; |
| 1893 | } |
| 1894 | |
| 1895 | chunk = min_t(unsigned int, skb->len, size); |
| 1896 | if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) { |
| 1897 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 1898 | if (copied == 0) |
| 1899 | copied = -EFAULT; |
| 1900 | break; |
| 1901 | } |
| 1902 | copied += chunk; |
| 1903 | size -= chunk; |
| 1904 | |
| 1905 | /* Mark read part of skb as used */ |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1906 | if (!(flags & MSG_PEEK)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1907 | skb_pull(skb, chunk); |
| 1908 | |
| 1909 | if (UNIXCB(skb).fp) |
| 1910 | unix_detach_fds(siocb->scm, skb); |
| 1911 | |
| 1912 | /* put the skb back if we didn't use it up.. */ |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1913 | if (skb->len) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1914 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 1915 | break; |
| 1916 | } |
| 1917 | |
Neil Horman | 70d4bf6 | 2010-07-20 06:45:56 +0000 | [diff] [blame] | 1918 | consume_skb(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1919 | |
| 1920 | if (siocb->scm->fp) |
| 1921 | break; |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1922 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1923 | /* It is questionable, see note in unix_dgram_recvmsg. |
| 1924 | */ |
| 1925 | if (UNIXCB(skb).fp) |
| 1926 | siocb->scm->fp = scm_fp_dup(UNIXCB(skb).fp); |
| 1927 | |
| 1928 | /* put message back and return */ |
| 1929 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 1930 | break; |
| 1931 | } |
| 1932 | } while (size); |
| 1933 | |
Ingo Molnar | 57b47a5 | 2006-03-20 22:35:41 -0800 | [diff] [blame] | 1934 | mutex_unlock(&u->readlock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | scm_recv(sock, msg, siocb->scm, flags); |
| 1936 | out: |
| 1937 | return copied ? : err; |
| 1938 | } |
| 1939 | |
| 1940 | static int unix_shutdown(struct socket *sock, int mode) |
| 1941 | { |
| 1942 | struct sock *sk = sock->sk; |
| 1943 | struct sock *other; |
| 1944 | |
| 1945 | mode = (mode+1)&(RCV_SHUTDOWN|SEND_SHUTDOWN); |
| 1946 | |
| 1947 | if (mode) { |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1948 | unix_state_lock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | sk->sk_shutdown |= mode; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1950 | other = unix_peer(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1951 | if (other) |
| 1952 | sock_hold(other); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1953 | unix_state_unlock(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1954 | sk->sk_state_change(sk); |
| 1955 | |
| 1956 | if (other && |
| 1957 | (sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET)) { |
| 1958 | |
| 1959 | int peer_mode = 0; |
| 1960 | |
| 1961 | if (mode&RCV_SHUTDOWN) |
| 1962 | peer_mode |= SEND_SHUTDOWN; |
| 1963 | if (mode&SEND_SHUTDOWN) |
| 1964 | peer_mode |= RCV_SHUTDOWN; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1965 | unix_state_lock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1966 | other->sk_shutdown |= peer_mode; |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 1967 | unix_state_unlock(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1968 | other->sk_state_change(other); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | if (peer_mode == SHUTDOWN_MASK) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 1970 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_HUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1971 | else if (peer_mode & RCV_SHUTDOWN) |
Pavel Emelyanov | 8d8ad9d | 2007-11-26 20:10:50 +0800 | [diff] [blame] | 1972 | sk_wake_async(other, SOCK_WAKE_WAITD, POLL_IN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | } |
| 1974 | if (other) |
| 1975 | sock_put(other); |
| 1976 | } |
| 1977 | return 0; |
| 1978 | } |
| 1979 | |
| 1980 | static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
| 1981 | { |
| 1982 | struct sock *sk = sock->sk; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 1983 | long amount = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1984 | int err; |
| 1985 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1986 | switch (cmd) { |
| 1987 | case SIOCOUTQ: |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 1988 | amount = sk_wmem_alloc_get(sk); |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 1989 | err = put_user(amount, (int __user *)arg); |
| 1990 | break; |
| 1991 | case SIOCINQ: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1992 | { |
| 1993 | struct sk_buff *skb; |
| 1994 | |
| 1995 | if (sk->sk_state == TCP_LISTEN) { |
| 1996 | err = -EINVAL; |
| 1997 | break; |
| 1998 | } |
| 1999 | |
| 2000 | spin_lock(&sk->sk_receive_queue.lock); |
| 2001 | if (sk->sk_type == SOCK_STREAM || |
| 2002 | sk->sk_type == SOCK_SEQPACKET) { |
| 2003 | skb_queue_walk(&sk->sk_receive_queue, skb) |
| 2004 | amount += skb->len; |
| 2005 | } else { |
| 2006 | skb = skb_peek(&sk->sk_receive_queue); |
| 2007 | if (skb) |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 2008 | amount = skb->len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | } |
| 2010 | spin_unlock(&sk->sk_receive_queue.lock); |
| 2011 | err = put_user(amount, (int __user *)arg); |
| 2012 | break; |
| 2013 | } |
| 2014 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2015 | default: |
| 2016 | err = -ENOIOCTLCMD; |
| 2017 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2018 | } |
| 2019 | return err; |
| 2020 | } |
| 2021 | |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2022 | 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] | 2023 | { |
| 2024 | struct sock *sk = sock->sk; |
| 2025 | unsigned int mask; |
| 2026 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2027 | sock_poll_wait(file, sk_sleep(sk), wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2028 | mask = 0; |
| 2029 | |
| 2030 | /* exceptional events? */ |
| 2031 | if (sk->sk_err) |
| 2032 | mask |= POLLERR; |
| 2033 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
| 2034 | mask |= POLLHUP; |
Davide Libenzi | f348d70 | 2006-03-25 03:07:39 -0800 | [diff] [blame] | 2035 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 2036 | mask |= POLLRDHUP; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2037 | |
| 2038 | /* readable? */ |
| 2039 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
| 2040 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 2041 | mask |= POLLIN | POLLRDNORM; |
| 2042 | |
| 2043 | /* Connection-based need to check for termination and startup */ |
Eric Dumazet | 6eba6a3 | 2008-11-16 22:58:44 -0800 | [diff] [blame] | 2044 | if ((sk->sk_type == SOCK_STREAM || sk->sk_type == SOCK_SEQPACKET) && |
| 2045 | sk->sk_state == TCP_CLOSE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2046 | mask |= POLLHUP; |
| 2047 | |
| 2048 | /* |
| 2049 | * we set writable also when the other side has shut down the |
| 2050 | * connection. This prevents stuck sockets. |
| 2051 | */ |
| 2052 | if (unix_writable(sk)) |
| 2053 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
| 2054 | |
| 2055 | return mask; |
| 2056 | } |
| 2057 | |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2058 | static unsigned int unix_dgram_poll(struct file *file, struct socket *sock, |
| 2059 | poll_table *wait) |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2060 | { |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2061 | struct sock *sk = sock->sk, *other; |
| 2062 | unsigned int mask, writable; |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2063 | |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 2064 | sock_poll_wait(file, sk_sleep(sk), wait); |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2065 | mask = 0; |
| 2066 | |
| 2067 | /* exceptional events? */ |
| 2068 | if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) |
| 2069 | mask |= POLLERR; |
| 2070 | if (sk->sk_shutdown & RCV_SHUTDOWN) |
| 2071 | mask |= POLLRDHUP; |
| 2072 | if (sk->sk_shutdown == SHUTDOWN_MASK) |
| 2073 | mask |= POLLHUP; |
| 2074 | |
| 2075 | /* readable? */ |
| 2076 | if (!skb_queue_empty(&sk->sk_receive_queue) || |
| 2077 | (sk->sk_shutdown & RCV_SHUTDOWN)) |
| 2078 | mask |= POLLIN | POLLRDNORM; |
| 2079 | |
| 2080 | /* Connection-based need to check for termination and startup */ |
| 2081 | if (sk->sk_type == SOCK_SEQPACKET) { |
| 2082 | if (sk->sk_state == TCP_CLOSE) |
| 2083 | mask |= POLLHUP; |
| 2084 | /* connection hasn't started yet? */ |
| 2085 | if (sk->sk_state == TCP_SYN_SENT) |
| 2086 | return mask; |
| 2087 | } |
| 2088 | |
| 2089 | /* writable? */ |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2090 | writable = unix_writable(sk); |
| 2091 | if (writable) { |
| 2092 | other = unix_peer_get(sk); |
| 2093 | if (other) { |
| 2094 | if (unix_peer(other) != sk) { |
Jiri Olsa | a57de0b | 2009-07-08 12:09:13 +0000 | [diff] [blame] | 2095 | sock_poll_wait(file, &unix_sk(other)->peer_wait, |
Rainer Weikusat | ec0d215 | 2008-06-27 19:34:18 -0700 | [diff] [blame] | 2096 | wait); |
| 2097 | if (unix_recvq_full(other)) |
| 2098 | writable = 0; |
| 2099 | } |
| 2100 | |
| 2101 | sock_put(other); |
| 2102 | } |
| 2103 | } |
| 2104 | |
| 2105 | if (writable) |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2106 | mask |= POLLOUT | POLLWRNORM | POLLWRBAND; |
| 2107 | else |
| 2108 | set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags); |
| 2109 | |
Rainer Weikusat | 3c73419 | 2008-06-17 22:28:05 -0700 | [diff] [blame] | 2110 | return mask; |
| 2111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | |
| 2113 | #ifdef CONFIG_PROC_FS |
Pavel Emelyanov | a53eb3f | 2007-11-23 20:30:01 +0800 | [diff] [blame] | 2114 | static struct sock *first_unix_socket(int *i) |
| 2115 | { |
| 2116 | for (*i = 0; *i <= UNIX_HASH_SIZE; (*i)++) { |
| 2117 | if (!hlist_empty(&unix_socket_table[*i])) |
| 2118 | return __sk_head(&unix_socket_table[*i]); |
| 2119 | } |
| 2120 | return NULL; |
| 2121 | } |
| 2122 | |
| 2123 | static struct sock *next_unix_socket(int *i, struct sock *s) |
| 2124 | { |
| 2125 | struct sock *next = sk_next(s); |
| 2126 | /* More in this chain? */ |
| 2127 | if (next) |
| 2128 | return next; |
| 2129 | /* Look for next non-empty chain. */ |
| 2130 | for ((*i)++; *i <= UNIX_HASH_SIZE; (*i)++) { |
| 2131 | if (!hlist_empty(&unix_socket_table[*i])) |
| 2132 | return __sk_head(&unix_socket_table[*i]); |
| 2133 | } |
| 2134 | return NULL; |
| 2135 | } |
| 2136 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2137 | struct unix_iter_state { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2138 | struct seq_net_private p; |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2139 | int i; |
| 2140 | }; |
Jianjun Kong | e27dfce | 2008-11-01 21:38:31 -0700 | [diff] [blame] | 2141 | |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2142 | static struct sock *unix_seq_idx(struct seq_file *seq, loff_t pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2143 | { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2144 | struct unix_iter_state *iter = seq->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2145 | loff_t off = 0; |
| 2146 | struct sock *s; |
| 2147 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2148 | for (s = first_unix_socket(&iter->i); s; s = next_unix_socket(&iter->i, s)) { |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2149 | if (sock_net(s) != seq_file_net(seq)) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2150 | continue; |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2151 | if (off == pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2152 | return s; |
| 2153 | ++off; |
| 2154 | } |
| 2155 | return NULL; |
| 2156 | } |
| 2157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2158 | static void *unix_seq_start(struct seq_file *seq, loff_t *pos) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2159 | __acquires(unix_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2160 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 2161 | spin_lock(&unix_table_lock); |
Joe Perches | b9f3124 | 2008-04-12 19:04:38 -0700 | [diff] [blame] | 2162 | return *pos ? unix_seq_idx(seq, *pos - 1) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2163 | } |
| 2164 | |
| 2165 | static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 2166 | { |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2167 | struct unix_iter_state *iter = seq->private; |
| 2168 | struct sock *sk = v; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2169 | ++*pos; |
| 2170 | |
Joe Perches | b9f3124 | 2008-04-12 19:04:38 -0700 | [diff] [blame] | 2171 | if (v == SEQ_START_TOKEN) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2172 | sk = first_unix_socket(&iter->i); |
| 2173 | else |
| 2174 | sk = next_unix_socket(&iter->i, sk); |
YOSHIFUJI Hideaki | 1218854 | 2008-03-26 02:36:06 +0900 | [diff] [blame] | 2175 | while (sk && (sock_net(sk) != seq_file_net(seq))) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2176 | sk = next_unix_socket(&iter->i, sk); |
| 2177 | return sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2178 | } |
| 2179 | |
| 2180 | static void unix_seq_stop(struct seq_file *seq, void *v) |
Eric Dumazet | 9a429c4 | 2008-01-01 21:58:02 -0800 | [diff] [blame] | 2181 | __releases(unix_table_lock) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2182 | { |
David S. Miller | fbe9cc4 | 2005-12-13 23:26:29 -0800 | [diff] [blame] | 2183 | spin_unlock(&unix_table_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2184 | } |
| 2185 | |
| 2186 | static int unix_seq_show(struct seq_file *seq, void *v) |
| 2187 | { |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2188 | |
Joe Perches | b9f3124 | 2008-04-12 19:04:38 -0700 | [diff] [blame] | 2189 | if (v == SEQ_START_TOKEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2190 | seq_puts(seq, "Num RefCount Protocol Flags Type St " |
| 2191 | "Inode Path\n"); |
| 2192 | else { |
| 2193 | struct sock *s = v; |
| 2194 | struct unix_sock *u = unix_sk(s); |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2195 | unix_state_lock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2196 | |
| 2197 | seq_printf(seq, "%p: %08X %08X %08X %04X %02X %5lu", |
| 2198 | s, |
| 2199 | atomic_read(&s->sk_refcnt), |
| 2200 | 0, |
| 2201 | s->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0, |
| 2202 | s->sk_type, |
| 2203 | s->sk_socket ? |
| 2204 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) : |
| 2205 | (s->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING), |
| 2206 | sock_i_ino(s)); |
| 2207 | |
| 2208 | if (u->addr) { |
| 2209 | int i, len; |
| 2210 | seq_putc(seq, ' '); |
| 2211 | |
| 2212 | i = 0; |
| 2213 | len = u->addr->len - sizeof(short); |
| 2214 | if (!UNIX_ABSTRACT(s)) |
| 2215 | len--; |
| 2216 | else { |
| 2217 | seq_putc(seq, '@'); |
| 2218 | i++; |
| 2219 | } |
| 2220 | for ( ; i < len; i++) |
| 2221 | seq_putc(seq, u->addr->name->sun_path[i]); |
| 2222 | } |
David S. Miller | 1c92b4e | 2007-05-31 13:24:26 -0700 | [diff] [blame] | 2223 | unix_state_unlock(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2224 | seq_putc(seq, '\n'); |
| 2225 | } |
| 2226 | |
| 2227 | return 0; |
| 2228 | } |
| 2229 | |
Philippe De Muyter | 56b3d97 | 2007-07-10 23:07:31 -0700 | [diff] [blame] | 2230 | static const struct seq_operations unix_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2231 | .start = unix_seq_start, |
| 2232 | .next = unix_seq_next, |
| 2233 | .stop = unix_seq_stop, |
| 2234 | .show = unix_seq_show, |
| 2235 | }; |
| 2236 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2237 | static int unix_seq_open(struct inode *inode, struct file *file) |
| 2238 | { |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2239 | return seq_open_net(inode, file, &unix_seq_ops, |
| 2240 | sizeof(struct unix_iter_state)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2241 | } |
| 2242 | |
Arjan van de Ven | da7071d | 2007-02-12 00:55:36 -0800 | [diff] [blame] | 2243 | static const struct file_operations unix_seq_fops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2244 | .owner = THIS_MODULE, |
| 2245 | .open = unix_seq_open, |
| 2246 | .read = seq_read, |
| 2247 | .llseek = seq_lseek, |
Denis V. Lunev | e372c41 | 2007-11-19 22:31:54 -0800 | [diff] [blame] | 2248 | .release = seq_release_net, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2249 | }; |
| 2250 | |
| 2251 | #endif |
| 2252 | |
Stephen Hemminger | ec1b4cf | 2009-10-05 05:58:39 +0000 | [diff] [blame] | 2253 | static const struct net_proto_family unix_family_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2254 | .family = PF_UNIX, |
| 2255 | .create = unix_create, |
| 2256 | .owner = THIS_MODULE, |
| 2257 | }; |
| 2258 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2259 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2260 | static int __net_init unix_net_init(struct net *net) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2261 | { |
| 2262 | int error = -ENOMEM; |
| 2263 | |
Denis V. Lunev | a0a53c8 | 2007-12-11 04:19:17 -0800 | [diff] [blame] | 2264 | net->unx.sysctl_max_dgram_qlen = 10; |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2265 | if (unix_sysctl_register(net)) |
| 2266 | goto out; |
Pavel Emelyanov | d392e49 | 2007-12-01 23:44:15 +1100 | [diff] [blame] | 2267 | |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2268 | #ifdef CONFIG_PROC_FS |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2269 | if (!proc_net_fops_create(net, "unix", 0, &unix_seq_fops)) { |
| 2270 | unix_sysctl_unregister(net); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2271 | goto out; |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2272 | } |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2273 | #endif |
| 2274 | error = 0; |
| 2275 | out: |
Jianjun Kong | 48dcc33e | 2008-11-01 21:37:27 -0700 | [diff] [blame] | 2276 | return error; |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2277 | } |
| 2278 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2279 | static void __net_exit unix_net_exit(struct net *net) |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2280 | { |
Pavel Emelyanov | 1597fbc | 2007-12-01 23:51:01 +1100 | [diff] [blame] | 2281 | unix_sysctl_unregister(net); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2282 | proc_net_remove(net, "unix"); |
| 2283 | } |
| 2284 | |
| 2285 | static struct pernet_operations unix_net_ops = { |
| 2286 | .init = unix_net_init, |
| 2287 | .exit = unix_net_exit, |
| 2288 | }; |
| 2289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2290 | static int __init af_unix_init(void) |
| 2291 | { |
| 2292 | int rc = -1; |
| 2293 | struct sk_buff *dummy_skb; |
| 2294 | |
YOSHIFUJI Hideaki | ef047f5 | 2006-09-01 00:29:06 -0700 | [diff] [blame] | 2295 | BUILD_BUG_ON(sizeof(struct unix_skb_parms) > sizeof(dummy_skb->cb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2296 | |
| 2297 | rc = proto_register(&unix_proto, 1); |
YOSHIFUJI Hideaki | ac7bfa6 | 2007-02-09 23:25:23 +0900 | [diff] [blame] | 2298 | if (rc != 0) { |
| 2299 | printk(KERN_CRIT "%s: Cannot create unix_sock SLAB cache!\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 2300 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2301 | goto out; |
| 2302 | } |
| 2303 | |
| 2304 | sock_register(&unix_family_ops); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2305 | register_pernet_subsys(&unix_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2306 | out: |
| 2307 | return rc; |
| 2308 | } |
| 2309 | |
| 2310 | static void __exit af_unix_exit(void) |
| 2311 | { |
| 2312 | sock_unregister(PF_UNIX); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2313 | proto_unregister(&unix_proto); |
Denis V. Lunev | 097e66c | 2007-11-19 22:29:30 -0800 | [diff] [blame] | 2314 | unregister_pernet_subsys(&unix_net_ops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2315 | } |
| 2316 | |
David Woodhouse | 3d36696 | 2008-04-24 00:59:25 -0700 | [diff] [blame] | 2317 | /* Earlier than device_initcall() so that other drivers invoking |
| 2318 | request_module() don't end up in a loop when modprobe tries |
| 2319 | to use a UNIX socket. But later than subsys_initcall() because |
| 2320 | we depend on stuff initialised there */ |
| 2321 | fs_initcall(af_unix_init); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2322 | module_exit(af_unix_exit); |
| 2323 | |
| 2324 | MODULE_LICENSE("GPL"); |
| 2325 | MODULE_ALIAS_NETPROTO(PF_UNIX); |