Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * The User Datagram Protocol (UDP). |
| 7 | * |
Jesper Juhl | 02c30a8 | 2005-05-05 16:16:16 -0700 | [diff] [blame] | 8 | * Authors: Ross Biro |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
| 10 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> |
Alan Cox | 113aa83 | 2008-10-13 19:01:08 -0700 | [diff] [blame] | 11 | * Alan Cox, <alan@lxorguk.ukuu.org.uk> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * Hirokazu Takahashi, <taka@valinux.co.jp> |
| 13 | * |
| 14 | * Fixes: |
| 15 | * Alan Cox : verify_area() calls |
| 16 | * Alan Cox : stopped close while in use off icmp |
| 17 | * messages. Not a fix but a botch that |
| 18 | * for udp at least is 'valid'. |
| 19 | * Alan Cox : Fixed icmp handling properly |
| 20 | * Alan Cox : Correct error for oversized datagrams |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 21 | * Alan Cox : Tidied select() semantics. |
| 22 | * Alan Cox : udp_err() fixed properly, also now |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | * select and read wake correctly on errors |
| 24 | * Alan Cox : udp_send verify_area moved to avoid mem leak |
| 25 | * Alan Cox : UDP can count its memory |
| 26 | * Alan Cox : send to an unknown connection causes |
| 27 | * an ECONNREFUSED off the icmp, but |
| 28 | * does NOT close. |
| 29 | * Alan Cox : Switched to new sk_buff handlers. No more backlog! |
| 30 | * Alan Cox : Using generic datagram code. Even smaller and the PEEK |
| 31 | * bug no longer crashes it. |
| 32 | * Fred Van Kempen : Net2e support for sk->broadcast. |
| 33 | * Alan Cox : Uses skb_free_datagram |
| 34 | * Alan Cox : Added get/set sockopt support. |
| 35 | * Alan Cox : Broadcasting without option set returns EACCES. |
| 36 | * Alan Cox : No wakeup calls. Instead we now use the callbacks. |
| 37 | * Alan Cox : Use ip_tos and ip_ttl |
| 38 | * Alan Cox : SNMP Mibs |
| 39 | * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support. |
| 40 | * Matt Dillon : UDP length checks. |
| 41 | * Alan Cox : Smarter af_inet used properly. |
| 42 | * Alan Cox : Use new kernel side addressing. |
| 43 | * Alan Cox : Incorrect return on truncated datagram receive. |
| 44 | * Arnt Gulbrandsen : New udp_send and stuff |
| 45 | * Alan Cox : Cache last socket |
| 46 | * Alan Cox : Route cache |
| 47 | * Jon Peatfield : Minor efficiency fix to sendto(). |
| 48 | * Mike Shaver : RFC1122 checks. |
| 49 | * Alan Cox : Nonblocking error fix. |
| 50 | * Willy Konynenberg : Transparent proxying support. |
| 51 | * Mike McLagan : Routing by source |
| 52 | * David S. Miller : New socket lookup architecture. |
| 53 | * Last socket cache retained as it |
| 54 | * does have a high hit rate. |
| 55 | * Olaf Kirch : Don't linearise iovec on sendmsg. |
| 56 | * Andi Kleen : Some cleanups, cache destination entry |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 57 | * for connect. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. |
| 59 | * Melvin Smith : Check msg_name not msg_namelen in sendto(), |
| 60 | * return ENOTCONN for unconnected sockets (POSIX) |
| 61 | * Janos Farkas : don't deliver multi/broadcasts to a different |
| 62 | * bound-to-device socket |
| 63 | * Hirokazu Takahashi : HW checksumming for outgoing UDP |
| 64 | * datagrams. |
| 65 | * Hirokazu Takahashi : sendfile() on UDP works now. |
| 66 | * Arnaldo C. Melo : convert /proc/net/udp to seq_file |
| 67 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| 68 | * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind |
| 69 | * a single port at the same time. |
| 70 | * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support |
James Chapman | 342f023 | 2007-06-27 15:37:46 -0700 | [diff] [blame] | 71 | * James Chapman : Add L2TP encapsulation type. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | * |
| 73 | * |
| 74 | * This program is free software; you can redistribute it and/or |
| 75 | * modify it under the terms of the GNU General Public License |
| 76 | * as published by the Free Software Foundation; either version |
| 77 | * 2 of the License, or (at your option) any later version. |
| 78 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 79 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | #include <asm/system.h> |
| 81 | #include <asm/uaccess.h> |
| 82 | #include <asm/ioctls.h> |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 83 | #include <linux/bootmem.h> |
Eric Dumazet | 8203efb | 2008-10-29 02:32:32 -0700 | [diff] [blame] | 84 | #include <linux/highmem.h> |
| 85 | #include <linux/swap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 86 | #include <linux/types.h> |
| 87 | #include <linux/fcntl.h> |
| 88 | #include <linux/module.h> |
| 89 | #include <linux/socket.h> |
| 90 | #include <linux/sockios.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 91 | #include <linux/igmp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | #include <linux/in.h> |
| 93 | #include <linux/errno.h> |
| 94 | #include <linux/timer.h> |
| 95 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #include <linux/inet.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 97 | #include <linux/netdevice.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 98 | #include <linux/slab.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 99 | #include <net/tcp_states.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | #include <linux/skbuff.h> |
| 101 | #include <linux/proc_fs.h> |
| 102 | #include <linux/seq_file.h> |
Eric W. Biederman | 457c4cb | 2007-09-12 12:01:34 +0200 | [diff] [blame] | 103 | #include <net/net_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #include <net/icmp.h> |
| 105 | #include <net/route.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | #include <net/checksum.h> |
| 107 | #include <net/xfrm.h> |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 108 | #include "udp_impl.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 110 | struct udp_table udp_table __read_mostly; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 111 | EXPORT_SYMBOL(udp_table); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 113 | int sysctl_udp_mem[3] __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 114 | EXPORT_SYMBOL(sysctl_udp_mem); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 115 | |
| 116 | int sysctl_udp_rmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 117 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 118 | |
| 119 | int sysctl_udp_wmem_min __read_mostly; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 120 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
| 121 | |
| 122 | atomic_t udp_memory_allocated; |
| 123 | EXPORT_SYMBOL(udp_memory_allocated); |
| 124 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 125 | #define MAX_UDP_PORTS 65536 |
| 126 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 127 | |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 128 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 129 | const struct udp_hslot *hslot, |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 130 | unsigned long *bitmap, |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 131 | struct sock *sk, |
| 132 | int (*saddr_comp)(const struct sock *sk1, |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 133 | const struct sock *sk2), |
| 134 | unsigned int log) |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 135 | { |
Eric Dumazet | f24d43c | 2008-10-09 14:51:27 -0700 | [diff] [blame] | 136 | struct sock *sk2; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 137 | struct hlist_nulls_node *node; |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 138 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 139 | sk_nulls_for_each(sk2, node, &hslot->head) |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 140 | if (net_eq(sock_net(sk2), net) && |
| 141 | sk2 != sk && |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 142 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 143 | (!sk2->sk_reuse || !sk->sk_reuse) && |
| 144 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || |
| 145 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 146 | (*saddr_comp)(sk, sk2)) { |
| 147 | if (bitmap) |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 148 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, |
| 149 | bitmap); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 150 | else |
| 151 | return 1; |
| 152 | } |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 153 | return 0; |
| 154 | } |
| 155 | |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 156 | /* |
| 157 | * Note: we still hold spinlock of primary hash chain, so no other writer |
| 158 | * can insert/delete a socket with local_port == num |
| 159 | */ |
| 160 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, |
| 161 | struct udp_hslot *hslot2, |
| 162 | struct sock *sk, |
| 163 | int (*saddr_comp)(const struct sock *sk1, |
| 164 | const struct sock *sk2)) |
| 165 | { |
| 166 | struct sock *sk2; |
| 167 | struct hlist_nulls_node *node; |
| 168 | int res = 0; |
| 169 | |
| 170 | spin_lock(&hslot2->lock); |
| 171 | udp_portaddr_for_each_entry(sk2, node, &hslot2->head) |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 172 | if (net_eq(sock_net(sk2), net) && |
| 173 | sk2 != sk && |
| 174 | (udp_sk(sk2)->udp_port_hash == num) && |
| 175 | (!sk2->sk_reuse || !sk->sk_reuse) && |
| 176 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || |
| 177 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 178 | (*saddr_comp)(sk, sk2)) { |
| 179 | res = 1; |
| 180 | break; |
| 181 | } |
| 182 | spin_unlock(&hslot2->lock); |
| 183 | return res; |
| 184 | } |
| 185 | |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 186 | /** |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 187 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 188 | * |
| 189 | * @sk: socket struct in question |
| 190 | * @snum: port number to look up |
David S. Miller | df2bc45 | 2007-06-05 15:18:43 -0700 | [diff] [blame] | 191 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 192 | * @hash2_nulladdr: AF-dependant hash value in secondary hash chains, |
| 193 | * with NULL address |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 194 | */ |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 195 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
David S. Miller | df2bc45 | 2007-06-05 15:18:43 -0700 | [diff] [blame] | 196 | int (*saddr_comp)(const struct sock *sk1, |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 197 | const struct sock *sk2), |
| 198 | unsigned int hash2_nulladdr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 200 | struct udp_hslot *hslot, *hslot2; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 201 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 202 | int error = 1; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 203 | struct net *net = sock_net(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
Stephen Hemminger | 32c1da7 | 2007-08-24 23:09:41 -0700 | [diff] [blame] | 205 | if (!snum) { |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 206 | int low, high, remaining; |
| 207 | unsigned rand; |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 208 | unsigned short first, last; |
| 209 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 211 | inet_get_local_port_range(&low, &high); |
Anton Arapov | a25de53 | 2007-10-18 22:00:17 -0700 | [diff] [blame] | 212 | remaining = (high - low) + 1; |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 213 | |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 214 | rand = net_random(); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 215 | first = (((u64)rand * remaining) >> 32) + low; |
| 216 | /* |
| 217 | * force rand to be an odd multiple of UDP_HTABLE_SIZE |
| 218 | */ |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 219 | rand = (rand | 1) * (udptable->mask + 1); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 220 | last = first + udptable->mask + 1; |
| 221 | do { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 222 | hslot = udp_hashslot(udptable, net, first); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 223 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 224 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 225 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 226 | saddr_comp, udptable->log); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 227 | |
| 228 | snum = first; |
| 229 | /* |
| 230 | * Iterate on all possible values of snum for this hash. |
| 231 | * Using steps of an odd multiple of UDP_HTABLE_SIZE |
| 232 | * give us randomization and full range coverage. |
| 233 | */ |
Eric Dumazet | 9088c56 | 2008-10-08 11:44:17 -0700 | [diff] [blame] | 234 | do { |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 235 | if (low <= snum && snum <= high && |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 236 | !test_bit(snum >> udptable->log, bitmap) && |
| 237 | !inet_is_reserved_local_port(snum)) |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 238 | goto found; |
| 239 | snum += rand; |
| 240 | } while (snum != first); |
| 241 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 5781b23 | 2009-12-13 19:32:39 -0800 | [diff] [blame] | 242 | } while (++first != last); |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 243 | goto fail; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 244 | } else { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 245 | hslot = udp_hashslot(udptable, net, snum); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 246 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 247 | if (hslot->count > 10) { |
| 248 | int exist; |
| 249 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; |
| 250 | |
| 251 | slot2 &= udptable->mask; |
| 252 | hash2_nulladdr &= udptable->mask; |
| 253 | |
| 254 | hslot2 = udp_hashslot2(udptable, slot2); |
| 255 | if (hslot->count < hslot2->count) |
| 256 | goto scan_primary_hash; |
| 257 | |
| 258 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 259 | sk, saddr_comp); |
| 260 | if (!exist && (hash2_nulladdr != slot2)) { |
| 261 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); |
| 262 | exist = udp_lib_lport_inuse2(net, snum, hslot2, |
| 263 | sk, saddr_comp); |
| 264 | } |
| 265 | if (exist) |
| 266 | goto fail_unlock; |
| 267 | else |
| 268 | goto found; |
| 269 | } |
| 270 | scan_primary_hash: |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 271 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
| 272 | saddr_comp, 0)) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 273 | goto fail_unlock; |
| 274 | } |
Eric Dumazet | 98322f2 | 2009-01-26 21:35:35 -0800 | [diff] [blame] | 275 | found: |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 276 | inet_sk(sk)->inet_num = snum; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 277 | udp_sk(sk)->udp_port_hash = snum; |
| 278 | udp_sk(sk)->udp_portaddr_hash ^= snum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | if (sk_unhashed(sk)) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 280 | sk_nulls_add_node_rcu(sk, &hslot->head); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 281 | hslot->count++; |
Pavel Emelyanov | c29a0bc | 2008-03-31 19:41:46 -0700 | [diff] [blame] | 282 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 283 | |
| 284 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 285 | spin_lock(&hslot2->lock); |
| 286 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 287 | &hslot2->head); |
| 288 | hslot2->count++; |
| 289 | spin_unlock(&hslot2->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 291 | error = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 292 | fail_unlock: |
| 293 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | fail: |
Gerrit Renker | 25030a7 | 2006-08-26 20:06:05 -0700 | [diff] [blame] | 295 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 297 | EXPORT_SYMBOL(udp_lib_get_port); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Vlad Yasevich | 499923c | 2009-04-09 17:37:33 +0000 | [diff] [blame] | 299 | static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 300 | { |
| 301 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); |
| 302 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 303 | return (!ipv6_only_sock(sk2) && |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 304 | (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr || |
| 305 | inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 306 | } |
| 307 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 308 | static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr, |
| 309 | unsigned int port) |
| 310 | { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 311 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 312 | } |
| 313 | |
Pavel Emelyanov | 6ba5a3c | 2008-03-22 16:51:21 -0700 | [diff] [blame] | 314 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 315 | { |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 316 | unsigned int hash2_nulladdr = |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 317 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 318 | unsigned int hash2_partial = |
| 319 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); |
| 320 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 321 | /* precompute partial secondary hash */ |
Eric Dumazet | 30fff92 | 2009-11-09 05:26:33 +0000 | [diff] [blame] | 322 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
| 323 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 324 | } |
| 325 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 326 | static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr, |
| 327 | unsigned short hnum, |
| 328 | __be16 sport, __be32 daddr, __be16 dport, int dif) |
| 329 | { |
| 330 | int score = -1; |
| 331 | |
Eric Dumazet | d4cada4 | 2009-11-08 10:17:30 +0000 | [diff] [blame] | 332 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 333 | !ipv6_only_sock(sk)) { |
| 334 | struct inet_sock *inet = inet_sk(sk); |
| 335 | |
| 336 | score = (sk->sk_family == PF_INET ? 1 : 0); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 337 | if (inet->inet_rcv_saddr) { |
| 338 | if (inet->inet_rcv_saddr != daddr) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 339 | return -1; |
| 340 | score += 2; |
| 341 | } |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 342 | if (inet->inet_daddr) { |
| 343 | if (inet->inet_daddr != saddr) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 344 | return -1; |
| 345 | score += 2; |
| 346 | } |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 347 | if (inet->inet_dport) { |
| 348 | if (inet->inet_dport != sport) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 349 | return -1; |
| 350 | score += 2; |
| 351 | } |
| 352 | if (sk->sk_bound_dev_if) { |
| 353 | if (sk->sk_bound_dev_if != dif) |
| 354 | return -1; |
| 355 | score += 2; |
| 356 | } |
| 357 | } |
| 358 | return score; |
| 359 | } |
| 360 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 361 | /* |
| 362 | * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num) |
| 363 | */ |
| 364 | #define SCORE2_MAX (1 + 2 + 2 + 2) |
| 365 | static inline int compute_score2(struct sock *sk, struct net *net, |
| 366 | __be32 saddr, __be16 sport, |
| 367 | __be32 daddr, unsigned int hnum, int dif) |
| 368 | { |
| 369 | int score = -1; |
| 370 | |
| 371 | if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) { |
| 372 | struct inet_sock *inet = inet_sk(sk); |
| 373 | |
| 374 | if (inet->inet_rcv_saddr != daddr) |
| 375 | return -1; |
| 376 | if (inet->inet_num != hnum) |
| 377 | return -1; |
| 378 | |
| 379 | score = (sk->sk_family == PF_INET ? 1 : 0); |
| 380 | if (inet->inet_daddr) { |
| 381 | if (inet->inet_daddr != saddr) |
| 382 | return -1; |
| 383 | score += 2; |
| 384 | } |
| 385 | if (inet->inet_dport) { |
| 386 | if (inet->inet_dport != sport) |
| 387 | return -1; |
| 388 | score += 2; |
| 389 | } |
| 390 | if (sk->sk_bound_dev_if) { |
| 391 | if (sk->sk_bound_dev_if != dif) |
| 392 | return -1; |
| 393 | score += 2; |
| 394 | } |
| 395 | } |
| 396 | return score; |
| 397 | } |
| 398 | |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 399 | |
| 400 | /* called with read_rcu_lock() */ |
| 401 | static struct sock *udp4_lib_lookup2(struct net *net, |
| 402 | __be32 saddr, __be16 sport, |
| 403 | __be32 daddr, unsigned int hnum, int dif, |
| 404 | struct udp_hslot *hslot2, unsigned int slot2) |
| 405 | { |
| 406 | struct sock *sk, *result; |
| 407 | struct hlist_nulls_node *node; |
| 408 | int score, badness; |
| 409 | |
| 410 | begin: |
| 411 | result = NULL; |
| 412 | badness = -1; |
| 413 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
| 414 | score = compute_score2(sk, net, saddr, sport, |
| 415 | daddr, hnum, dif); |
| 416 | if (score > badness) { |
| 417 | result = sk; |
| 418 | badness = score; |
| 419 | if (score == SCORE2_MAX) |
| 420 | goto exact_match; |
| 421 | } |
| 422 | } |
| 423 | /* |
| 424 | * if the nulls value we got at the end of this lookup is |
| 425 | * not the expected one, we must restart lookup. |
| 426 | * We probably met an item that was moved to another chain. |
| 427 | */ |
| 428 | if (get_nulls_value(node) != slot2) |
| 429 | goto begin; |
| 430 | |
| 431 | if (result) { |
| 432 | exact_match: |
| 433 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) |
| 434 | result = NULL; |
| 435 | else if (unlikely(compute_score2(result, net, saddr, sport, |
| 436 | daddr, hnum, dif) < badness)) { |
| 437 | sock_put(result); |
| 438 | goto begin; |
| 439 | } |
| 440 | } |
| 441 | return result; |
| 442 | } |
| 443 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 444 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
| 445 | * harder than this. -DaveM |
| 446 | */ |
| 447 | static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
| 448 | __be16 sport, __be32 daddr, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 449 | int dif, struct udp_table *udptable) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 450 | { |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 451 | struct sock *sk, *result; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 452 | struct hlist_nulls_node *node; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 453 | unsigned short hnum = ntohs(dport); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 454 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
| 455 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 456 | int score, badness; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 457 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 458 | rcu_read_lock(); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 459 | if (hslot->count > 10) { |
| 460 | hash2 = udp4_portaddr_hash(net, daddr, hnum); |
| 461 | slot2 = hash2 & udptable->mask; |
| 462 | hslot2 = &udptable->hash2[slot2]; |
| 463 | if (hslot->count < hslot2->count) |
| 464 | goto begin; |
| 465 | |
| 466 | result = udp4_lib_lookup2(net, saddr, sport, |
| 467 | daddr, hnum, dif, |
| 468 | hslot2, slot2); |
| 469 | if (!result) { |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 470 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 471 | slot2 = hash2 & udptable->mask; |
| 472 | hslot2 = &udptable->hash2[slot2]; |
| 473 | if (hslot->count < hslot2->count) |
| 474 | goto begin; |
| 475 | |
Jorge Boncompte [DTI2] | 1223c67 | 2010-04-08 04:56:48 +0000 | [diff] [blame] | 476 | result = udp4_lib_lookup2(net, saddr, sport, |
Eric Dumazet | 0eae88f | 2010-04-20 19:06:52 -0700 | [diff] [blame] | 477 | htonl(INADDR_ANY), hnum, dif, |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 478 | hslot2, slot2); |
| 479 | } |
| 480 | rcu_read_unlock(); |
| 481 | return result; |
| 482 | } |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 483 | begin: |
| 484 | result = NULL; |
| 485 | badness = -1; |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 486 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 487 | score = compute_score(sk, net, saddr, hnum, sport, |
| 488 | daddr, dport, dif); |
| 489 | if (score > badness) { |
| 490 | result = sk; |
| 491 | badness = score; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 492 | } |
| 493 | } |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 494 | /* |
| 495 | * if the nulls value we got at the end of this lookup is |
| 496 | * not the expected one, we must restart lookup. |
| 497 | * We probably met an item that was moved to another chain. |
| 498 | */ |
Eric Dumazet | 5051ebd | 2009-11-08 10:18:11 +0000 | [diff] [blame] | 499 | if (get_nulls_value(node) != slot) |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 500 | goto begin; |
| 501 | |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 502 | if (result) { |
| 503 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) |
| 504 | result = NULL; |
| 505 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, |
| 506 | daddr, dport, dif) < badness)) { |
| 507 | sock_put(result); |
| 508 | goto begin; |
| 509 | } |
| 510 | } |
| 511 | rcu_read_unlock(); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 512 | return result; |
| 513 | } |
| 514 | |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 515 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
| 516 | __be16 sport, __be16 dport, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 517 | struct udp_table *udptable) |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 518 | { |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 519 | struct sock *sk; |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 520 | const struct iphdr *iph = ip_hdr(skb); |
| 521 | |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 522 | if (unlikely(sk = skb_steal_sock(skb))) |
| 523 | return sk; |
| 524 | else |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 525 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 526 | iph->daddr, dport, inet_iif(skb), |
| 527 | udptable); |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 528 | } |
| 529 | |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 530 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
| 531 | __be32 daddr, __be16 dport, int dif) |
| 532 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 533 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
KOVACS Krisztian | bcd4130 | 2008-10-01 07:48:10 -0700 | [diff] [blame] | 534 | } |
| 535 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); |
| 536 | |
Eric Dumazet | 920a461 | 2008-11-01 21:22:23 -0700 | [diff] [blame] | 537 | static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 538 | __be16 loc_port, __be32 loc_addr, |
| 539 | __be16 rmt_port, __be32 rmt_addr, |
| 540 | int dif) |
| 541 | { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 542 | struct hlist_nulls_node *node; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 543 | struct sock *s = sk; |
| 544 | unsigned short hnum = ntohs(loc_port); |
| 545 | |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 546 | sk_nulls_for_each_from(s, node) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 547 | struct inet_sock *inet = inet_sk(s); |
| 548 | |
Joe Perches | 9d4fb27 | 2009-11-23 10:41:23 -0800 | [diff] [blame] | 549 | if (!net_eq(sock_net(s), net) || |
| 550 | udp_sk(s)->udp_port_hash != hnum || |
| 551 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || |
| 552 | (inet->inet_dport != rmt_port && inet->inet_dport) || |
| 553 | (inet->inet_rcv_saddr && |
| 554 | inet->inet_rcv_saddr != loc_addr) || |
| 555 | ipv6_only_sock(s) || |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 556 | (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) |
| 557 | continue; |
| 558 | if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) |
| 559 | continue; |
| 560 | goto found; |
| 561 | } |
| 562 | s = NULL; |
| 563 | found: |
| 564 | return s; |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * This routine is called by the ICMP module when it gets some |
| 569 | * sort of error condition. If err < 0 then the socket should |
| 570 | * be closed and the error returned to the user. If err > 0 |
| 571 | * it's just the icmp type << 8 | icmp code. |
| 572 | * Header points to the ip header of the error packet. We move |
| 573 | * on past this. Then (as it used to claim before adjustment) |
| 574 | * header points to the first 8 bytes of the udp header. We need |
| 575 | * to find the appropriate port. |
| 576 | */ |
| 577 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 578 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 579 | { |
| 580 | struct inet_sock *inet; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 581 | struct iphdr *iph = (struct iphdr *)skb->data; |
| 582 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 583 | const int type = icmp_hdr(skb)->type; |
| 584 | const int code = icmp_hdr(skb)->code; |
| 585 | struct sock *sk; |
| 586 | int harderr; |
| 587 | int err; |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 588 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 589 | |
Pavel Emelyanov | fd54d71 | 2008-07-14 23:01:40 -0700 | [diff] [blame] | 590 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 591 | iph->saddr, uh->source, skb->dev->ifindex, udptable); |
| 592 | if (sk == NULL) { |
Pavel Emelyanov | dcfc23c | 2008-07-14 23:03:00 -0700 | [diff] [blame] | 593 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 594 | return; /* No socket for error */ |
| 595 | } |
| 596 | |
| 597 | err = 0; |
| 598 | harderr = 0; |
| 599 | inet = inet_sk(sk); |
| 600 | |
| 601 | switch (type) { |
| 602 | default: |
| 603 | case ICMP_TIME_EXCEEDED: |
| 604 | err = EHOSTUNREACH; |
| 605 | break; |
| 606 | case ICMP_SOURCE_QUENCH: |
| 607 | goto out; |
| 608 | case ICMP_PARAMETERPROB: |
| 609 | err = EPROTO; |
| 610 | harderr = 1; |
| 611 | break; |
| 612 | case ICMP_DEST_UNREACH: |
| 613 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ |
| 614 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
| 615 | err = EMSGSIZE; |
| 616 | harderr = 1; |
| 617 | break; |
| 618 | } |
| 619 | goto out; |
| 620 | } |
| 621 | err = EHOSTUNREACH; |
| 622 | if (code <= NR_ICMP_UNREACH) { |
| 623 | harderr = icmp_err_convert[code].fatal; |
| 624 | err = icmp_err_convert[code].errno; |
| 625 | } |
| 626 | break; |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * RFC1122: OK. Passes ICMP errors back to application, as per |
| 631 | * 4.1.3.3. |
| 632 | */ |
| 633 | if (!inet->recverr) { |
| 634 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| 635 | goto out; |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 636 | } else |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 637 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
Eric Dumazet | b1faf56 | 2010-05-31 23:44:05 -0700 | [diff] [blame] | 638 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 639 | sk->sk_err = err; |
| 640 | sk->sk_error_report(sk); |
| 641 | out: |
| 642 | sock_put(sk); |
| 643 | } |
| 644 | |
| 645 | void udp_err(struct sk_buff *skb, u32 info) |
| 646 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 647 | __udp4_lib_err(skb, info, &udp_table); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 648 | } |
| 649 | |
| 650 | /* |
| 651 | * Throw away all pending data and cancel the corking. Socket is locked. |
| 652 | */ |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 653 | void udp_flush_pending_frames(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 654 | { |
| 655 | struct udp_sock *up = udp_sk(sk); |
| 656 | |
| 657 | if (up->pending) { |
| 658 | up->len = 0; |
| 659 | up->pending = 0; |
| 660 | ip_flush_pending_frames(sk); |
| 661 | } |
| 662 | } |
Denis V. Lunev | 36d926b | 2008-06-04 15:49:07 +0400 | [diff] [blame] | 663 | EXPORT_SYMBOL(udp_flush_pending_frames); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 664 | |
| 665 | /** |
| 666 | * udp4_hwcsum_outgoing - handle outgoing HW checksumming |
| 667 | * @sk: socket we are sending on |
| 668 | * @skb: sk_buff containing the filled-in UDP header |
| 669 | * (checksum field must be zeroed out) |
| 670 | */ |
| 671 | static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 672 | __be32 src, __be32 dst, int len) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 673 | { |
| 674 | unsigned int offset; |
| 675 | struct udphdr *uh = udp_hdr(skb); |
| 676 | __wsum csum = 0; |
| 677 | |
| 678 | if (skb_queue_len(&sk->sk_write_queue) == 1) { |
| 679 | /* |
| 680 | * Only one fragment on the socket. |
| 681 | */ |
| 682 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 683 | skb->csum_offset = offsetof(struct udphdr, check); |
| 684 | uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0); |
| 685 | } else { |
| 686 | /* |
| 687 | * HW-checksum won't work as there are two or more |
| 688 | * fragments on the socket so that all csums of sk_buffs |
| 689 | * should be together |
| 690 | */ |
| 691 | offset = skb_transport_offset(skb); |
| 692 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
| 693 | |
| 694 | skb->ip_summed = CHECKSUM_NONE; |
| 695 | |
| 696 | skb_queue_walk(&sk->sk_write_queue, skb) { |
| 697 | csum = csum_add(csum, skb->csum); |
| 698 | } |
| 699 | |
| 700 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
| 701 | if (uh->check == 0) |
| 702 | uh->check = CSUM_MANGLED_0; |
| 703 | } |
| 704 | } |
| 705 | |
| 706 | /* |
| 707 | * Push out all pending data as one UDP datagram. Socket is locked. |
| 708 | */ |
| 709 | static int udp_push_pending_frames(struct sock *sk) |
| 710 | { |
| 711 | struct udp_sock *up = udp_sk(sk); |
| 712 | struct inet_sock *inet = inet_sk(sk); |
| 713 | struct flowi *fl = &inet->cork.fl; |
| 714 | struct sk_buff *skb; |
| 715 | struct udphdr *uh; |
| 716 | int err = 0; |
| 717 | int is_udplite = IS_UDPLITE(sk); |
| 718 | __wsum csum = 0; |
| 719 | |
| 720 | /* Grab the skbuff where UDP header space exists. */ |
| 721 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) |
| 722 | goto out; |
| 723 | |
| 724 | /* |
| 725 | * Create a UDP header |
| 726 | */ |
| 727 | uh = udp_hdr(skb); |
| 728 | uh->source = fl->fl_ip_sport; |
| 729 | uh->dest = fl->fl_ip_dport; |
| 730 | uh->len = htons(up->len); |
| 731 | uh->check = 0; |
| 732 | |
| 733 | if (is_udplite) /* UDP-Lite */ |
| 734 | csum = udplite_csum_outgoing(sk, skb); |
| 735 | |
| 736 | else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */ |
| 737 | |
| 738 | skb->ip_summed = CHECKSUM_NONE; |
| 739 | goto send; |
| 740 | |
| 741 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
| 742 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 743 | udp4_hwcsum_outgoing(sk, skb, fl->fl4_src, fl->fl4_dst, up->len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 744 | goto send; |
| 745 | |
| 746 | } else /* `normal' UDP */ |
| 747 | csum = udp_csum_outgoing(sk, skb); |
| 748 | |
| 749 | /* add protocol-dependent pseudo-header */ |
| 750 | uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len, |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 751 | sk->sk_protocol, csum); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 752 | if (uh->check == 0) |
| 753 | uh->check = CSUM_MANGLED_0; |
| 754 | |
| 755 | send: |
| 756 | err = ip_push_pending_frames(sk); |
Eric Dumazet | 6ce9e7b | 2009-09-02 18:05:33 -0700 | [diff] [blame] | 757 | if (err) { |
| 758 | if (err == -ENOBUFS && !inet->recverr) { |
| 759 | UDP_INC_STATS_USER(sock_net(sk), |
| 760 | UDP_MIB_SNDBUFERRORS, is_udplite); |
| 761 | err = 0; |
| 762 | } |
| 763 | } else |
| 764 | UDP_INC_STATS_USER(sock_net(sk), |
| 765 | UDP_MIB_OUTDATAGRAMS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 766 | out: |
| 767 | up->len = 0; |
| 768 | up->pending = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 769 | return err; |
| 770 | } |
| 771 | |
| 772 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 773 | size_t len) |
| 774 | { |
| 775 | struct inet_sock *inet = inet_sk(sk); |
| 776 | struct udp_sock *up = udp_sk(sk); |
| 777 | int ulen = len; |
| 778 | struct ipcm_cookie ipc; |
| 779 | struct rtable *rt = NULL; |
| 780 | int free = 0; |
| 781 | int connected = 0; |
| 782 | __be32 daddr, faddr, saddr; |
| 783 | __be16 dport; |
| 784 | u8 tos; |
| 785 | int err, is_udplite = IS_UDPLITE(sk); |
| 786 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| 787 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
| 788 | |
| 789 | if (len > 0xFFFF) |
| 790 | return -EMSGSIZE; |
| 791 | |
| 792 | /* |
| 793 | * Check the flags. |
| 794 | */ |
| 795 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 796 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 797 | return -EOPNOTSUPP; |
| 798 | |
| 799 | ipc.opt = NULL; |
Patrick Ohly | 51f31ca | 2009-02-12 05:03:39 +0000 | [diff] [blame] | 800 | ipc.shtx.flags = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 801 | |
| 802 | if (up->pending) { |
| 803 | /* |
| 804 | * There are pending frames. |
| 805 | * The socket lock must be held while it's corked. |
| 806 | */ |
| 807 | lock_sock(sk); |
| 808 | if (likely(up->pending)) { |
| 809 | if (unlikely(up->pending != AF_INET)) { |
| 810 | release_sock(sk); |
| 811 | return -EINVAL; |
| 812 | } |
| 813 | goto do_append_data; |
| 814 | } |
| 815 | release_sock(sk); |
| 816 | } |
| 817 | ulen += sizeof(struct udphdr); |
| 818 | |
| 819 | /* |
| 820 | * Get and verify the address. |
| 821 | */ |
| 822 | if (msg->msg_name) { |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 823 | struct sockaddr_in * usin = (struct sockaddr_in *)msg->msg_name; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 824 | if (msg->msg_namelen < sizeof(*usin)) |
| 825 | return -EINVAL; |
| 826 | if (usin->sin_family != AF_INET) { |
| 827 | if (usin->sin_family != AF_UNSPEC) |
| 828 | return -EAFNOSUPPORT; |
| 829 | } |
| 830 | |
| 831 | daddr = usin->sin_addr.s_addr; |
| 832 | dport = usin->sin_port; |
| 833 | if (dport == 0) |
| 834 | return -EINVAL; |
| 835 | } else { |
| 836 | if (sk->sk_state != TCP_ESTABLISHED) |
| 837 | return -EDESTADDRREQ; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 838 | daddr = inet->inet_daddr; |
| 839 | dport = inet->inet_dport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 840 | /* Open fast path for connected socket. |
| 841 | Route will not be used, if at least one option is set. |
| 842 | */ |
| 843 | connected = 1; |
| 844 | } |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 845 | ipc.addr = inet->inet_saddr; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 846 | |
| 847 | ipc.oif = sk->sk_bound_dev_if; |
Patrick Ohly | 51f31ca | 2009-02-12 05:03:39 +0000 | [diff] [blame] | 848 | err = sock_tx_timestamp(msg, sk, &ipc.shtx); |
| 849 | if (err) |
| 850 | return err; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 851 | if (msg->msg_controllen) { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 852 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 853 | if (err) |
| 854 | return err; |
| 855 | if (ipc.opt) |
| 856 | free = 1; |
| 857 | connected = 0; |
| 858 | } |
| 859 | if (!ipc.opt) |
| 860 | ipc.opt = inet->opt; |
| 861 | |
| 862 | saddr = ipc.addr; |
| 863 | ipc.addr = faddr = daddr; |
| 864 | |
| 865 | if (ipc.opt && ipc.opt->srr) { |
| 866 | if (!daddr) |
| 867 | return -EINVAL; |
| 868 | faddr = ipc.opt->faddr; |
| 869 | connected = 0; |
| 870 | } |
| 871 | tos = RT_TOS(inet->tos); |
| 872 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
| 873 | (msg->msg_flags & MSG_DONTROUTE) || |
| 874 | (ipc.opt && ipc.opt->is_strictroute)) { |
| 875 | tos |= RTO_ONLINK; |
| 876 | connected = 0; |
| 877 | } |
| 878 | |
| 879 | if (ipv4_is_multicast(daddr)) { |
| 880 | if (!ipc.oif) |
| 881 | ipc.oif = inet->mc_index; |
| 882 | if (!saddr) |
| 883 | saddr = inet->mc_addr; |
| 884 | connected = 0; |
| 885 | } |
| 886 | |
| 887 | if (connected) |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 888 | rt = (struct rtable *)sk_dst_check(sk, 0); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 889 | |
| 890 | if (rt == NULL) { |
| 891 | struct flowi fl = { .oif = ipc.oif, |
Atis Elsts | 914a9ab | 2009-10-01 15:16:49 -0700 | [diff] [blame] | 892 | .mark = sk->sk_mark, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 893 | .nl_u = { .ip4_u = |
| 894 | { .daddr = faddr, |
| 895 | .saddr = saddr, |
| 896 | .tos = tos } }, |
| 897 | .proto = sk->sk_protocol, |
Balazs Scheidler | a134f85 | 2008-11-20 01:07:24 -0800 | [diff] [blame] | 898 | .flags = inet_sk_flowi_flags(sk), |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 899 | .uli_u = { .ports = |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 900 | { .sport = inet->inet_sport, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 901 | .dport = dport } } }; |
Pavel Emelyanov | 84a3aa0 | 2008-07-16 20:19:08 -0700 | [diff] [blame] | 902 | struct net *net = sock_net(sk); |
| 903 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 904 | security_sk_classify_flow(sk, &fl); |
Pavel Emelyanov | 84a3aa0 | 2008-07-16 20:19:08 -0700 | [diff] [blame] | 905 | err = ip_route_output_flow(net, &rt, &fl, sk, 1); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 906 | if (err) { |
| 907 | if (err == -ENETUNREACH) |
Pavel Emelyanov | 7c73a6f | 2008-07-16 20:20:11 -0700 | [diff] [blame] | 908 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 909 | goto out; |
| 910 | } |
| 911 | |
| 912 | err = -EACCES; |
| 913 | if ((rt->rt_flags & RTCF_BROADCAST) && |
| 914 | !sock_flag(sk, SOCK_BROADCAST)) |
| 915 | goto out; |
| 916 | if (connected) |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 917 | sk_dst_set(sk, dst_clone(&rt->dst)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 918 | } |
| 919 | |
| 920 | if (msg->msg_flags&MSG_CONFIRM) |
| 921 | goto do_confirm; |
| 922 | back_from_confirm: |
| 923 | |
| 924 | saddr = rt->rt_src; |
| 925 | if (!ipc.addr) |
| 926 | daddr = ipc.addr = rt->rt_dst; |
| 927 | |
| 928 | lock_sock(sk); |
| 929 | if (unlikely(up->pending)) { |
| 930 | /* The socket is already corked while preparing it. */ |
| 931 | /* ... which is an evident application bug. --ANK */ |
| 932 | release_sock(sk); |
| 933 | |
| 934 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
| 935 | err = -EINVAL; |
| 936 | goto out; |
| 937 | } |
| 938 | /* |
| 939 | * Now cork the socket to pend data. |
| 940 | */ |
| 941 | inet->cork.fl.fl4_dst = daddr; |
| 942 | inet->cork.fl.fl_ip_dport = dport; |
| 943 | inet->cork.fl.fl4_src = saddr; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 944 | inet->cork.fl.fl_ip_sport = inet->inet_sport; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 945 | up->pending = AF_INET; |
| 946 | |
| 947 | do_append_data: |
| 948 | up->len += ulen; |
| 949 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| 950 | err = ip_append_data(sk, getfrag, msg->msg_iov, ulen, |
Eric Dumazet | 2e77d89 | 2008-11-24 15:52:46 -0800 | [diff] [blame] | 951 | sizeof(struct udphdr), &ipc, &rt, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 952 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
| 953 | if (err) |
| 954 | udp_flush_pending_frames(sk); |
| 955 | else if (!corkreq) |
| 956 | err = udp_push_pending_frames(sk); |
| 957 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| 958 | up->pending = 0; |
| 959 | release_sock(sk); |
| 960 | |
| 961 | out: |
| 962 | ip_rt_put(rt); |
| 963 | if (free) |
| 964 | kfree(ipc.opt); |
| 965 | if (!err) |
| 966 | return len; |
| 967 | /* |
| 968 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting |
| 969 | * ENOBUFS might not be good (it's not tunable per se), but otherwise |
| 970 | * we don't have a good statistic (IpOutDiscards but it can be too many |
| 971 | * things). We could add another new stat but at least for now that |
| 972 | * seems like overkill. |
| 973 | */ |
| 974 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 975 | UDP_INC_STATS_USER(sock_net(sk), |
| 976 | UDP_MIB_SNDBUFERRORS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 977 | } |
| 978 | return err; |
| 979 | |
| 980 | do_confirm: |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 981 | dst_confirm(&rt->dst); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 982 | if (!(msg->msg_flags&MSG_PROBE) || len) |
| 983 | goto back_from_confirm; |
| 984 | err = 0; |
| 985 | goto out; |
| 986 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 987 | EXPORT_SYMBOL(udp_sendmsg); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 988 | |
| 989 | int udp_sendpage(struct sock *sk, struct page *page, int offset, |
| 990 | size_t size, int flags) |
| 991 | { |
| 992 | struct udp_sock *up = udp_sk(sk); |
| 993 | int ret; |
| 994 | |
| 995 | if (!up->pending) { |
| 996 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; |
| 997 | |
| 998 | /* Call udp_sendmsg to specify destination address which |
| 999 | * sendpage interface can't pass. |
| 1000 | * This will succeed only when the socket is connected. |
| 1001 | */ |
| 1002 | ret = udp_sendmsg(NULL, sk, &msg, 0); |
| 1003 | if (ret < 0) |
| 1004 | return ret; |
| 1005 | } |
| 1006 | |
| 1007 | lock_sock(sk); |
| 1008 | |
| 1009 | if (unlikely(!up->pending)) { |
| 1010 | release_sock(sk); |
| 1011 | |
| 1012 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n"); |
| 1013 | return -EINVAL; |
| 1014 | } |
| 1015 | |
| 1016 | ret = ip_append_page(sk, page, offset, size, flags); |
| 1017 | if (ret == -EOPNOTSUPP) { |
| 1018 | release_sock(sk); |
| 1019 | return sock_no_sendpage(sk->sk_socket, page, offset, |
| 1020 | size, flags); |
| 1021 | } |
| 1022 | if (ret < 0) { |
| 1023 | udp_flush_pending_frames(sk); |
| 1024 | goto out; |
| 1025 | } |
| 1026 | |
| 1027 | up->len += size; |
| 1028 | if (!(up->corkflag || (flags&MSG_MORE))) |
| 1029 | ret = udp_push_pending_frames(sk); |
| 1030 | if (!ret) |
| 1031 | ret = size; |
| 1032 | out: |
| 1033 | release_sock(sk); |
| 1034 | return ret; |
| 1035 | } |
| 1036 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1037 | |
| 1038 | /** |
| 1039 | * first_packet_length - return length of first packet in receive queue |
| 1040 | * @sk: socket |
| 1041 | * |
| 1042 | * Drops all bad checksum frames, until a valid one is found. |
| 1043 | * Returns the length of found skb, or 0 if none is found. |
| 1044 | */ |
| 1045 | static unsigned int first_packet_length(struct sock *sk) |
| 1046 | { |
| 1047 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; |
| 1048 | struct sk_buff *skb; |
| 1049 | unsigned int res; |
| 1050 | |
| 1051 | __skb_queue_head_init(&list_kill); |
| 1052 | |
| 1053 | spin_lock_bh(&rcvq->lock); |
| 1054 | while ((skb = skb_peek(rcvq)) != NULL && |
| 1055 | udp_lib_checksum_complete(skb)) { |
| 1056 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
| 1057 | IS_UDPLITE(sk)); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1058 | atomic_inc(&sk->sk_drops); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1059 | __skb_unlink(skb, rcvq); |
| 1060 | __skb_queue_tail(&list_kill, skb); |
| 1061 | } |
| 1062 | res = skb ? skb->len : 0; |
| 1063 | spin_unlock_bh(&rcvq->lock); |
| 1064 | |
| 1065 | if (!skb_queue_empty(&list_kill)) { |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1066 | bool slow = lock_sock_fast(sk); |
| 1067 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1068 | __skb_queue_purge(&list_kill); |
| 1069 | sk_mem_reclaim_partial(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1070 | unlock_sock_fast(sk, slow); |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1071 | } |
| 1072 | return res; |
| 1073 | } |
| 1074 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | /* |
| 1076 | * IOCTL requests applicable to the UDP protocol |
| 1077 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1078 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 1080 | { |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1081 | switch (cmd) { |
| 1082 | case SIOCOUTQ: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | { |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 1084 | int amount = sk_wmem_alloc_get(sk); |
| 1085 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1086 | return put_user(amount, (int __user *)arg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1087 | } |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1088 | |
| 1089 | case SIOCINQ: |
| 1090 | { |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1091 | unsigned int amount = first_packet_length(sk); |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1092 | |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1093 | if (amount) |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1094 | /* |
| 1095 | * We will only return the amount |
| 1096 | * of this packet since that is all |
| 1097 | * that will be read. |
| 1098 | */ |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1099 | amount -= sizeof(struct udphdr); |
| 1100 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1101 | return put_user(amount, (int __user *)arg); |
| 1102 | } |
| 1103 | |
| 1104 | default: |
| 1105 | return -ENOIOCTLCMD; |
| 1106 | } |
| 1107 | |
| 1108 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1110 | EXPORT_SYMBOL(udp_ioctl); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1111 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1112 | /* |
| 1113 | * This should be easy, if there is something there we |
| 1114 | * return it, otherwise we block. |
| 1115 | */ |
| 1116 | |
| 1117 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
| 1118 | size_t len, int noblock, int flags, int *addr_len) |
| 1119 | { |
| 1120 | struct inet_sock *inet = inet_sk(sk); |
| 1121 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; |
| 1122 | struct sk_buff *skb; |
Gerrit Renker | 81d54ec | 2010-02-10 20:26:19 +0000 | [diff] [blame] | 1123 | unsigned int ulen; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1124 | int peeked; |
| 1125 | int err; |
| 1126 | int is_udplite = IS_UDPLITE(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1127 | bool slow; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1128 | |
| 1129 | /* |
| 1130 | * Check any passed addresses |
| 1131 | */ |
| 1132 | if (addr_len) |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1133 | *addr_len = sizeof(*sin); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1134 | |
| 1135 | if (flags & MSG_ERRQUEUE) |
| 1136 | return ip_recv_error(sk, msg, len); |
| 1137 | |
| 1138 | try_again: |
| 1139 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
| 1140 | &peeked, &err); |
| 1141 | if (!skb) |
| 1142 | goto out; |
| 1143 | |
| 1144 | ulen = skb->len - sizeof(struct udphdr); |
Gerrit Renker | 81d54ec | 2010-02-10 20:26:19 +0000 | [diff] [blame] | 1145 | if (len > ulen) |
| 1146 | len = ulen; |
| 1147 | else if (len < ulen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1148 | msg->msg_flags |= MSG_TRUNC; |
| 1149 | |
| 1150 | /* |
| 1151 | * If checksum is needed at all, try to do it while copying the |
| 1152 | * data. If the data is truncated, or if we only want a partial |
| 1153 | * coverage checksum (UDP-Lite), do it before the copy. |
| 1154 | */ |
| 1155 | |
Gerrit Renker | 81d54ec | 2010-02-10 20:26:19 +0000 | [diff] [blame] | 1156 | if (len < ulen || UDP_SKB_CB(skb)->partial_cov) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1157 | if (udp_lib_checksum_complete(skb)) |
| 1158 | goto csum_copy_err; |
| 1159 | } |
| 1160 | |
| 1161 | if (skb_csum_unnecessary(skb)) |
| 1162 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
Gerrit Renker | 81d54ec | 2010-02-10 20:26:19 +0000 | [diff] [blame] | 1163 | msg->msg_iov, len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1164 | else { |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1165 | err = skb_copy_and_csum_datagram_iovec(skb, |
| 1166 | sizeof(struct udphdr), |
| 1167 | msg->msg_iov); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1168 | |
| 1169 | if (err == -EINVAL) |
| 1170 | goto csum_copy_err; |
| 1171 | } |
| 1172 | |
| 1173 | if (err) |
| 1174 | goto out_free; |
| 1175 | |
| 1176 | if (!peeked) |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1177 | UDP_INC_STATS_USER(sock_net(sk), |
| 1178 | UDP_MIB_INDATAGRAMS, is_udplite); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1179 | |
Neil Horman | 3b88578 | 2009-10-12 13:26:31 -0700 | [diff] [blame] | 1180 | sock_recv_ts_and_drops(msg, sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1181 | |
| 1182 | /* Copy the address. */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1183 | if (sin) { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1184 | sin->sin_family = AF_INET; |
| 1185 | sin->sin_port = udp_hdr(skb)->source; |
| 1186 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 1187 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| 1188 | } |
| 1189 | if (inet->cmsg_flags) |
| 1190 | ip_cmsg_recv(msg, skb); |
| 1191 | |
Gerrit Renker | 81d54ec | 2010-02-10 20:26:19 +0000 | [diff] [blame] | 1192 | err = len; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1193 | if (flags & MSG_TRUNC) |
| 1194 | err = ulen; |
| 1195 | |
| 1196 | out_free: |
Eric Dumazet | 9d410c7 | 2009-10-30 05:03:53 +0000 | [diff] [blame] | 1197 | skb_free_datagram_locked(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1198 | out: |
| 1199 | return err; |
| 1200 | |
| 1201 | csum_copy_err: |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1202 | slow = lock_sock_fast(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1203 | if (!skb_kill_datagram(sk, skb, flags)) |
Pavel Emelyanov | 629ca23 | 2008-07-05 21:18:07 -0700 | [diff] [blame] | 1204 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1205 | unlock_sock_fast(sk, slow); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1206 | |
| 1207 | if (noblock) |
| 1208 | return -EAGAIN; |
| 1209 | goto try_again; |
| 1210 | } |
| 1211 | |
| 1212 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1213 | int udp_disconnect(struct sock *sk, int flags) |
| 1214 | { |
| 1215 | struct inet_sock *inet = inet_sk(sk); |
| 1216 | /* |
| 1217 | * 1003.1g - break association. |
| 1218 | */ |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | sk->sk_state = TCP_CLOSE; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1221 | inet->inet_daddr = 0; |
| 1222 | inet->inet_dport = 0; |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 1223 | sock_rps_save_rxhash(sk, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1224 | sk->sk_bound_dev_if = 0; |
| 1225 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) |
| 1226 | inet_reset_saddr(sk); |
| 1227 | |
| 1228 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { |
| 1229 | sk->sk_prot->unhash(sk); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1230 | inet->inet_sport = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | } |
| 1232 | sk_dst_reset(sk); |
| 1233 | return 0; |
| 1234 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1235 | EXPORT_SYMBOL(udp_disconnect); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1237 | void udp_lib_unhash(struct sock *sk) |
| 1238 | { |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1239 | if (sk_hashed(sk)) { |
| 1240 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1241 | struct udp_hslot *hslot, *hslot2; |
| 1242 | |
| 1243 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1244 | udp_sk(sk)->udp_port_hash); |
| 1245 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1246 | |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1247 | spin_lock_bh(&hslot->lock); |
| 1248 | if (sk_nulls_del_node_init_rcu(sk)) { |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 1249 | hslot->count--; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 1250 | inet_sk(sk)->inet_num = 0; |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1251 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 1252 | |
| 1253 | spin_lock(&hslot2->lock); |
| 1254 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
| 1255 | hslot2->count--; |
| 1256 | spin_unlock(&hslot2->lock); |
Eric Dumazet | 723b461 | 2008-11-25 13:55:15 -0800 | [diff] [blame] | 1257 | } |
| 1258 | spin_unlock_bh(&hslot->lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1259 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1260 | } |
| 1261 | EXPORT_SYMBOL(udp_lib_unhash); |
| 1262 | |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1263 | /* |
| 1264 | * inet_rcv_saddr was changed, we must rehash secondary hash |
| 1265 | */ |
| 1266 | void udp_lib_rehash(struct sock *sk, u16 newhash) |
| 1267 | { |
| 1268 | if (sk_hashed(sk)) { |
| 1269 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
| 1270 | struct udp_hslot *hslot, *hslot2, *nhslot2; |
| 1271 | |
| 1272 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); |
| 1273 | nhslot2 = udp_hashslot2(udptable, newhash); |
| 1274 | udp_sk(sk)->udp_portaddr_hash = newhash; |
| 1275 | if (hslot2 != nhslot2) { |
| 1276 | hslot = udp_hashslot(udptable, sock_net(sk), |
| 1277 | udp_sk(sk)->udp_port_hash); |
| 1278 | /* we must lock primary chain too */ |
| 1279 | spin_lock_bh(&hslot->lock); |
| 1280 | |
| 1281 | spin_lock(&hslot2->lock); |
| 1282 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
| 1283 | hslot2->count--; |
| 1284 | spin_unlock(&hslot2->lock); |
| 1285 | |
| 1286 | spin_lock(&nhslot2->lock); |
| 1287 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
| 1288 | &nhslot2->head); |
| 1289 | nhslot2->count++; |
| 1290 | spin_unlock(&nhslot2->lock); |
| 1291 | |
| 1292 | spin_unlock_bh(&hslot->lock); |
| 1293 | } |
| 1294 | } |
| 1295 | } |
| 1296 | EXPORT_SYMBOL(udp_lib_rehash); |
| 1297 | |
| 1298 | static void udp_v4_rehash(struct sock *sk) |
| 1299 | { |
| 1300 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), |
| 1301 | inet_sk(sk)->inet_rcv_saddr, |
| 1302 | inet_sk(sk)->inet_num); |
| 1303 | udp_lib_rehash(sk, new_hash); |
| 1304 | } |
| 1305 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1306 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
| 1307 | { |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1308 | int rc; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1309 | |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1310 | if (inet_sk(sk)->inet_daddr) |
David S. Miller | c58dc01 | 2010-04-27 15:05:31 -0700 | [diff] [blame] | 1311 | sock_rps_save_rxhash(sk, skb->rxhash); |
Tom Herbert | fec5e65 | 2010-04-16 16:01:27 -0700 | [diff] [blame] | 1312 | |
Eric Dumazet | f84af32 | 2010-04-28 15:31:51 -0700 | [diff] [blame] | 1313 | rc = ip_queue_rcv_skb(sk, skb); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1314 | if (rc < 0) { |
| 1315 | int is_udplite = IS_UDPLITE(sk); |
| 1316 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1317 | /* Note that an ENOMEM error is charged twice */ |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1318 | if (rc == -ENOMEM) |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1319 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1320 | is_udplite); |
Eric Dumazet | 766e9037 | 2009-10-14 20:40:11 -0700 | [diff] [blame] | 1321 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
| 1322 | kfree_skb(skb); |
| 1323 | return -1; |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1324 | } |
| 1325 | |
| 1326 | return 0; |
| 1327 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1328 | } |
| 1329 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1330 | /* returns: |
| 1331 | * -1: error |
| 1332 | * 0: success |
| 1333 | * >0: "udp encap" protocol resubmission |
| 1334 | * |
| 1335 | * Note that in the success and error cases, the skb is assumed to |
| 1336 | * have either been requeued or freed. |
| 1337 | */ |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1338 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1339 | { |
| 1340 | struct udp_sock *up = udp_sk(sk); |
| 1341 | int rc; |
| 1342 | int is_udplite = IS_UDPLITE(sk); |
| 1343 | |
| 1344 | /* |
| 1345 | * Charge it to the socket, dropping if the queue is full. |
| 1346 | */ |
| 1347 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
| 1348 | goto drop; |
| 1349 | nf_reset(skb); |
| 1350 | |
| 1351 | if (up->encap_type) { |
| 1352 | /* |
| 1353 | * This is an encapsulation socket so pass the skb to |
| 1354 | * the socket's udp_encap_rcv() hook. Otherwise, just |
| 1355 | * fall through and pass this up the UDP socket. |
| 1356 | * up->encap_rcv() returns the following value: |
| 1357 | * =0 if skb was successfully passed to the encap |
| 1358 | * handler or was discarded by it. |
| 1359 | * >0 if skb should be passed on to UDP. |
| 1360 | * <0 if skb should be resubmitted as proto -N |
| 1361 | */ |
| 1362 | |
| 1363 | /* if we're overly short, let UDP handle it */ |
| 1364 | if (skb->len > sizeof(struct udphdr) && |
| 1365 | up->encap_rcv != NULL) { |
| 1366 | int ret; |
| 1367 | |
| 1368 | ret = (*up->encap_rcv)(sk, skb); |
| 1369 | if (ret <= 0) { |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1370 | UDP_INC_STATS_BH(sock_net(sk), |
| 1371 | UDP_MIB_INDATAGRAMS, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1372 | is_udplite); |
| 1373 | return -ret; |
| 1374 | } |
| 1375 | } |
| 1376 | |
| 1377 | /* FALLTHROUGH -- it's a UDP Packet */ |
| 1378 | } |
| 1379 | |
| 1380 | /* |
| 1381 | * UDP-Lite specific tests, ignored on UDP sockets |
| 1382 | */ |
| 1383 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
| 1384 | |
| 1385 | /* |
| 1386 | * MIB statistics other than incrementing the error count are |
| 1387 | * disabled for the following two types of errors: these depend |
| 1388 | * on the application settings, not on the functioning of the |
| 1389 | * protocol stack as such. |
| 1390 | * |
| 1391 | * RFC 3828 here recommends (sec 3.3): "There should also be a |
| 1392 | * way ... to ... at least let the receiving application block |
| 1393 | * delivery of packets with coverage values less than a value |
| 1394 | * provided by the application." |
| 1395 | */ |
| 1396 | if (up->pcrlen == 0) { /* full coverage was set */ |
| 1397 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage " |
| 1398 | "%d while full coverage %d requested\n", |
| 1399 | UDP_SKB_CB(skb)->cscov, skb->len); |
| 1400 | goto drop; |
| 1401 | } |
| 1402 | /* The next case involves violating the min. coverage requested |
| 1403 | * by the receiver. This is subtle: if receiver wants x and x is |
| 1404 | * greater than the buffersize/MTU then receiver will complain |
| 1405 | * that it wants x while sender emits packets of smaller size y. |
| 1406 | * Therefore the above ...()->partial_cov statement is essential. |
| 1407 | */ |
| 1408 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
| 1409 | LIMIT_NETDEBUG(KERN_WARNING |
| 1410 | "UDPLITE: coverage %d too small, need min %d\n", |
| 1411 | UDP_SKB_CB(skb)->cscov, up->pcrlen); |
| 1412 | goto drop; |
| 1413 | } |
| 1414 | } |
| 1415 | |
| 1416 | if (sk->sk_filter) { |
| 1417 | if (udp_lib_checksum_complete(skb)) |
| 1418 | goto drop; |
| 1419 | } |
| 1420 | |
Eric Dumazet | c377411 | 2010-04-27 15:13:20 -0700 | [diff] [blame] | 1421 | |
| 1422 | if (sk_rcvqueues_full(sk, skb)) |
| 1423 | goto drop; |
| 1424 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1425 | rc = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1426 | |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1427 | bh_lock_sock(sk); |
| 1428 | if (!sock_owned_by_user(sk)) |
| 1429 | rc = __udp_queue_rcv_skb(sk, skb); |
Zhu Yi | a3a858f | 2010-03-04 18:01:47 +0000 | [diff] [blame] | 1430 | else if (sk_add_backlog(sk, skb)) { |
Zhu Yi | 5534979 | 2010-03-04 18:01:42 +0000 | [diff] [blame] | 1431 | bh_unlock_sock(sk); |
| 1432 | goto drop; |
| 1433 | } |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1434 | bh_unlock_sock(sk); |
| 1435 | |
| 1436 | return rc; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1437 | |
| 1438 | drop: |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1439 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
Eric Dumazet | 8edf19c | 2009-10-15 00:12:40 +0000 | [diff] [blame] | 1440 | atomic_inc(&sk->sk_drops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1441 | kfree_skb(skb); |
| 1442 | return -1; |
| 1443 | } |
| 1444 | |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1445 | |
| 1446 | static void flush_stack(struct sock **stack, unsigned int count, |
| 1447 | struct sk_buff *skb, unsigned int final) |
| 1448 | { |
| 1449 | unsigned int i; |
| 1450 | struct sk_buff *skb1 = NULL; |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1451 | struct sock *sk; |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1452 | |
| 1453 | for (i = 0; i < count; i++) { |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1454 | sk = stack[i]; |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1455 | if (likely(skb1 == NULL)) |
| 1456 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); |
| 1457 | |
Eric Dumazet | f6b8f32 | 2009-11-08 10:20:19 +0000 | [diff] [blame] | 1458 | if (!skb1) { |
| 1459 | atomic_inc(&sk->sk_drops); |
| 1460 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
| 1461 | IS_UDPLITE(sk)); |
| 1462 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
| 1463 | IS_UDPLITE(sk)); |
| 1464 | } |
| 1465 | |
| 1466 | if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0) |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1467 | skb1 = NULL; |
| 1468 | } |
| 1469 | if (unlikely(skb1)) |
| 1470 | kfree_skb(skb1); |
| 1471 | } |
| 1472 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1473 | /* |
| 1474 | * Multicasts and broadcasts go to each listener. |
| 1475 | * |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1476 | * Note: called only from the BH handler context. |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1477 | */ |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 1478 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1479 | struct udphdr *uh, |
| 1480 | __be32 saddr, __be32 daddr, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1481 | struct udp_table *udptable) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1482 | { |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1483 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 1484 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1485 | int dif; |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1486 | unsigned int i, count = 0; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1487 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1488 | spin_lock(&hslot->lock); |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 1489 | sk = sk_nulls_head(&hslot->head); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1490 | dif = skb->dev->ifindex; |
Eric Dumazet | 920a461 | 2008-11-01 21:22:23 -0700 | [diff] [blame] | 1491 | sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1492 | while (sk) { |
| 1493 | stack[count++] = sk; |
| 1494 | sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest, |
| 1495 | daddr, uh->source, saddr, dif); |
| 1496 | if (unlikely(count == ARRAY_SIZE(stack))) { |
| 1497 | if (!sk) |
| 1498 | break; |
| 1499 | flush_stack(stack, count, skb, ~0); |
| 1500 | count = 0; |
| 1501 | } |
| 1502 | } |
| 1503 | /* |
| 1504 | * before releasing chain lock, we must take a reference on sockets |
| 1505 | */ |
| 1506 | for (i = 0; i < count; i++) |
| 1507 | sock_hold(stack[i]); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1508 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1509 | spin_unlock(&hslot->lock); |
Eric Dumazet | 1240d13 | 2009-11-08 10:18:44 +0000 | [diff] [blame] | 1510 | |
| 1511 | /* |
| 1512 | * do the slow work with no lock held |
| 1513 | */ |
| 1514 | if (count) { |
| 1515 | flush_stack(stack, count, skb, count - 1); |
| 1516 | |
| 1517 | for (i = 0; i < count; i++) |
| 1518 | sock_put(stack[i]); |
| 1519 | } else { |
| 1520 | kfree_skb(skb); |
| 1521 | } |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1522 | return 0; |
| 1523 | } |
| 1524 | |
| 1525 | /* Initialize UDP checksum. If exited with zero value (success), |
| 1526 | * CHECKSUM_UNNECESSARY means, that no more checks are required. |
| 1527 | * Otherwise, csum completion requires chacksumming packet body, |
| 1528 | * including udp header and folding it to skb->csum. |
| 1529 | */ |
| 1530 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, |
| 1531 | int proto) |
| 1532 | { |
| 1533 | const struct iphdr *iph; |
| 1534 | int err; |
| 1535 | |
| 1536 | UDP_SKB_CB(skb)->partial_cov = 0; |
| 1537 | UDP_SKB_CB(skb)->cscov = skb->len; |
| 1538 | |
| 1539 | if (proto == IPPROTO_UDPLITE) { |
| 1540 | err = udplite_checksum_init(skb, uh); |
| 1541 | if (err) |
| 1542 | return err; |
| 1543 | } |
| 1544 | |
| 1545 | iph = ip_hdr(skb); |
| 1546 | if (uh->check == 0) { |
| 1547 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1548 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1549 | if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1550 | proto, skb->csum)) |
| 1551 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 1552 | } |
| 1553 | if (!skb_csum_unnecessary(skb)) |
| 1554 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
| 1555 | skb->len, proto, 0); |
| 1556 | /* Probably, we should checksum udp header (it should be in cache |
| 1557 | * in any case) and data in tiny packets (< rx copybreak). |
| 1558 | */ |
| 1559 | |
| 1560 | return 0; |
| 1561 | } |
| 1562 | |
| 1563 | /* |
| 1564 | * All we need to do is get the socket, and then do a checksum. |
| 1565 | */ |
| 1566 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1567 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1568 | int proto) |
| 1569 | { |
| 1570 | struct sock *sk; |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1571 | struct udphdr *uh; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1572 | unsigned short ulen; |
Eric Dumazet | adf3090 | 2009-06-02 05:19:30 +0000 | [diff] [blame] | 1573 | struct rtable *rt = skb_rtable(skb); |
Jesper Dangaard Brouer | 2783ef2 | 2009-02-06 01:59:12 -0800 | [diff] [blame] | 1574 | __be32 saddr, daddr; |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1575 | struct net *net = dev_net(skb->dev); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1576 | |
| 1577 | /* |
| 1578 | * Validate the packet. |
| 1579 | */ |
| 1580 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| 1581 | goto drop; /* No space for header. */ |
| 1582 | |
Jesper Dangaard Brouer | 7b5e56f | 2009-02-05 15:05:45 -0800 | [diff] [blame] | 1583 | uh = udp_hdr(skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1584 | ulen = ntohs(uh->len); |
Bjørn Mork | ccc2d97 | 2010-05-06 03:44:34 +0000 | [diff] [blame] | 1585 | saddr = ip_hdr(skb)->saddr; |
| 1586 | daddr = ip_hdr(skb)->daddr; |
| 1587 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1588 | if (ulen > skb->len) |
| 1589 | goto short_packet; |
| 1590 | |
| 1591 | if (proto == IPPROTO_UDP) { |
| 1592 | /* UDP validates ulen. */ |
| 1593 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) |
| 1594 | goto short_packet; |
| 1595 | uh = udp_hdr(skb); |
| 1596 | } |
| 1597 | |
| 1598 | if (udp4_csum_init(skb, uh, proto)) |
| 1599 | goto csum_error; |
| 1600 | |
| 1601 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
Pavel Emelyanov | e316349 | 2008-06-16 17:12:11 -0700 | [diff] [blame] | 1602 | return __udp4_lib_mcast_deliver(net, skb, uh, |
| 1603 | saddr, daddr, udptable); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1604 | |
KOVACS Krisztian | 607c4aa | 2008-10-07 12:38:32 -0700 | [diff] [blame] | 1605 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1606 | |
| 1607 | if (sk != NULL) { |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1608 | int ret = udp_queue_rcv_skb(sk, skb); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1609 | sock_put(sk); |
| 1610 | |
| 1611 | /* a return value > 0 means to resubmit the input, but |
| 1612 | * it wants the return to be -protocol, or 0 |
| 1613 | */ |
| 1614 | if (ret > 0) |
| 1615 | return -ret; |
| 1616 | return 0; |
| 1617 | } |
| 1618 | |
| 1619 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| 1620 | goto drop; |
| 1621 | nf_reset(skb); |
| 1622 | |
| 1623 | /* No socket. Drop packet silently, if checksum is wrong */ |
| 1624 | if (udp_lib_checksum_complete(skb)) |
| 1625 | goto csum_error; |
| 1626 | |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1627 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1628 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
| 1629 | |
| 1630 | /* |
| 1631 | * Hmm. We got an UDP packet to a port to which we |
| 1632 | * don't wanna listen. Ignore it. |
| 1633 | */ |
| 1634 | kfree_skb(skb); |
| 1635 | return 0; |
| 1636 | |
| 1637 | short_packet: |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1638 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1639 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1640 | &saddr, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1641 | ntohs(uh->source), |
| 1642 | ulen, |
| 1643 | skb->len, |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1644 | &daddr, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1645 | ntohs(uh->dest)); |
| 1646 | goto drop; |
| 1647 | |
| 1648 | csum_error: |
| 1649 | /* |
| 1650 | * RFC1122: OK. Discards the bad packet silently (as far as |
| 1651 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). |
| 1652 | */ |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1653 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1654 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1655 | &saddr, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1656 | ntohs(uh->source), |
Harvey Harrison | 673d57e | 2008-10-31 00:53:57 -0700 | [diff] [blame] | 1657 | &daddr, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1658 | ntohs(uh->dest), |
| 1659 | ulen); |
| 1660 | drop: |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 1661 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1662 | kfree_skb(skb); |
| 1663 | return 0; |
| 1664 | } |
| 1665 | |
| 1666 | int udp_rcv(struct sk_buff *skb) |
| 1667 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1668 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1669 | } |
| 1670 | |
Brian Haley | 7d06b2e | 2008-06-14 17:04:49 -0700 | [diff] [blame] | 1671 | void udp_destroy_sock(struct sock *sk) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1672 | { |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1673 | bool slow = lock_sock_fast(sk); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1674 | udp_flush_pending_frames(sk); |
Eric Dumazet | 8a74ad6 | 2010-05-26 19:20:18 +0000 | [diff] [blame] | 1675 | unlock_sock_fast(sk, slow); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1676 | } |
| 1677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | /* |
| 1679 | * Socket option code for UDP |
| 1680 | */ |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1681 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1682 | char __user *optval, unsigned int optlen, |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1683 | int (*push_pending_frames)(struct sock *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | { |
| 1685 | struct udp_sock *up = udp_sk(sk); |
| 1686 | int val; |
| 1687 | int err = 0; |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 1688 | int is_udplite = IS_UDPLITE(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1690 | if (optlen < sizeof(int)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1691 | return -EINVAL; |
| 1692 | |
| 1693 | if (get_user(val, (int __user *)optval)) |
| 1694 | return -EFAULT; |
| 1695 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1696 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1697 | case UDP_CORK: |
| 1698 | if (val != 0) { |
| 1699 | up->corkflag = 1; |
| 1700 | } else { |
| 1701 | up->corkflag = 0; |
| 1702 | lock_sock(sk); |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1703 | (*push_pending_frames)(sk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1704 | release_sock(sk); |
| 1705 | } |
| 1706 | break; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1708 | case UDP_ENCAP: |
| 1709 | switch (val) { |
| 1710 | case 0: |
| 1711 | case UDP_ENCAP_ESPINUDP: |
| 1712 | case UDP_ENCAP_ESPINUDP_NON_IKE: |
James Chapman | 067b207 | 2007-07-05 17:08:05 -0700 | [diff] [blame] | 1713 | up->encap_rcv = xfrm4_udp_encap_rcv; |
| 1714 | /* FALLTHROUGH */ |
James Chapman | 342f023 | 2007-06-27 15:37:46 -0700 | [diff] [blame] | 1715 | case UDP_ENCAP_L2TPINUDP: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1716 | up->encap_type = val; |
| 1717 | break; |
| 1718 | default: |
| 1719 | err = -ENOPROTOOPT; |
| 1720 | break; |
| 1721 | } |
| 1722 | break; |
| 1723 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1724 | /* |
| 1725 | * UDP-Lite's partial checksum coverage (RFC 3828). |
| 1726 | */ |
| 1727 | /* The sender sets actual checksum coverage length via this option. |
| 1728 | * The case coverage > packet length is handled by send module. */ |
| 1729 | case UDPLITE_SEND_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 1730 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1731 | return -ENOPROTOOPT; |
| 1732 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ |
| 1733 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 1734 | else if (val > USHRT_MAX) |
| 1735 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1736 | up->pcslen = val; |
| 1737 | up->pcflag |= UDPLITE_SEND_CC; |
| 1738 | break; |
| 1739 | |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1740 | /* The receiver specifies a minimum checksum coverage value. To make |
| 1741 | * sense, this should be set to at least 8 (as done below). If zero is |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1742 | * used, this again means full checksum coverage. */ |
| 1743 | case UDPLITE_RECV_CSCOV: |
Wang Chen | b2bf1e2 | 2007-12-03 22:34:16 +1100 | [diff] [blame] | 1744 | if (!is_udplite) /* Disable the option on UDP sockets */ |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1745 | return -ENOPROTOOPT; |
| 1746 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ |
| 1747 | val = 8; |
Alexey Dobriyan | 4be929b | 2010-05-24 14:33:03 -0700 | [diff] [blame] | 1748 | else if (val > USHRT_MAX) |
| 1749 | val = USHRT_MAX; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1750 | up->pcrlen = val; |
| 1751 | up->pcflag |= UDPLITE_RECV_CC; |
| 1752 | break; |
| 1753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1754 | default: |
| 1755 | err = -ENOPROTOOPT; |
| 1756 | break; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1757 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1758 | |
| 1759 | return err; |
| 1760 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1761 | EXPORT_SYMBOL(udp_lib_setsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1762 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1763 | int udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1764 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1765 | { |
| 1766 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1767 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1768 | udp_push_pending_frames); |
| 1769 | return ip_setsockopt(sk, level, optname, optval, optlen); |
| 1770 | } |
| 1771 | |
| 1772 | #ifdef CONFIG_COMPAT |
| 1773 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 1774 | char __user *optval, unsigned int optlen) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1775 | { |
| 1776 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1777 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
| 1778 | udp_push_pending_frames); |
| 1779 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
| 1780 | } |
| 1781 | #endif |
| 1782 | |
Gerrit Renker | 4c0a6cb | 2006-11-27 09:29:59 -0800 | [diff] [blame] | 1783 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
| 1784 | char __user *optval, int __user *optlen) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1785 | { |
| 1786 | struct udp_sock *up = udp_sk(sk); |
| 1787 | int val, len; |
| 1788 | |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1789 | if (get_user(len, optlen)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1790 | return -EFAULT; |
| 1791 | |
| 1792 | len = min_t(unsigned int, len, sizeof(int)); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1793 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1794 | if (len < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1795 | return -EINVAL; |
| 1796 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1797 | switch (optname) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1798 | case UDP_CORK: |
| 1799 | val = up->corkflag; |
| 1800 | break; |
| 1801 | |
| 1802 | case UDP_ENCAP: |
| 1803 | val = up->encap_type; |
| 1804 | break; |
| 1805 | |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1806 | /* The following two cannot be changed on UDP sockets, the return is |
| 1807 | * always 0 (which corresponds to the full checksum coverage of UDP). */ |
| 1808 | case UDPLITE_SEND_CSCOV: |
| 1809 | val = up->pcslen; |
| 1810 | break; |
| 1811 | |
| 1812 | case UDPLITE_RECV_CSCOV: |
| 1813 | val = up->pcrlen; |
| 1814 | break; |
| 1815 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1816 | default: |
| 1817 | return -ENOPROTOOPT; |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1818 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1819 | |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1820 | if (put_user(len, optlen)) |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1821 | return -EFAULT; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1822 | if (copy_to_user(optval, &val, len)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | return -EFAULT; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1824 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1825 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1826 | EXPORT_SYMBOL(udp_lib_getsockopt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1827 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1828 | int udp_getsockopt(struct sock *sk, int level, int optname, |
| 1829 | char __user *optval, int __user *optlen) |
| 1830 | { |
| 1831 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1832 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 1833 | return ip_getsockopt(sk, level, optname, optval, optlen); |
| 1834 | } |
| 1835 | |
| 1836 | #ifdef CONFIG_COMPAT |
| 1837 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, |
| 1838 | char __user *optval, int __user *optlen) |
| 1839 | { |
| 1840 | if (level == SOL_UDP || level == SOL_UDPLITE) |
| 1841 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
| 1842 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
| 1843 | } |
| 1844 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1845 | /** |
| 1846 | * udp_poll - wait for a UDP event. |
| 1847 | * @file - file struct |
| 1848 | * @sock - socket |
| 1849 | * @wait - poll table |
| 1850 | * |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1851 | * This is same as datagram poll, except for the special case of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1852 | * blocking sockets. If application is using a blocking fd |
| 1853 | * and a packet with checksum error is in the queue; |
| 1854 | * then it could get return from select indicating data available |
| 1855 | * but then block when reading it. Add special case code |
| 1856 | * to work around these arguably broken applications. |
| 1857 | */ |
| 1858 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) |
| 1859 | { |
| 1860 | unsigned int mask = datagram_poll(file, sock, wait); |
| 1861 | struct sock *sk = sock->sk; |
Gerrit Renker | ba4e58e | 2006-11-27 11:10:57 -0800 | [diff] [blame] | 1862 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1863 | /* Check for false positives due to checksum errors */ |
Eric Dumazet | 8558467 | 2009-10-09 04:43:40 +0000 | [diff] [blame] | 1864 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
| 1865 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) |
| 1866 | mask &= ~(POLLIN | POLLRDNORM); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | |
| 1868 | return mask; |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 1869 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1870 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1871 | EXPORT_SYMBOL(udp_poll); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1873 | struct proto udp_prot = { |
| 1874 | .name = "UDP", |
| 1875 | .owner = THIS_MODULE, |
| 1876 | .close = udp_lib_close, |
| 1877 | .connect = ip4_datagram_connect, |
| 1878 | .disconnect = udp_disconnect, |
| 1879 | .ioctl = udp_ioctl, |
| 1880 | .destroy = udp_destroy_sock, |
| 1881 | .setsockopt = udp_setsockopt, |
| 1882 | .getsockopt = udp_getsockopt, |
| 1883 | .sendmsg = udp_sendmsg, |
| 1884 | .recvmsg = udp_recvmsg, |
| 1885 | .sendpage = udp_sendpage, |
Herbert Xu | 9382177 | 2008-09-15 11:48:46 -0700 | [diff] [blame] | 1886 | .backlog_rcv = __udp_queue_rcv_skb, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1887 | .hash = udp_lib_hash, |
| 1888 | .unhash = udp_lib_unhash, |
Eric Dumazet | 719f835 | 2010-09-08 05:08:44 +0000 | [diff] [blame] | 1889 | .rehash = udp_v4_rehash, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1890 | .get_port = udp_v4_get_port, |
| 1891 | .memory_allocated = &udp_memory_allocated, |
| 1892 | .sysctl_mem = sysctl_udp_mem, |
| 1893 | .sysctl_wmem = &sysctl_udp_wmem_min, |
| 1894 | .sysctl_rmem = &sysctl_udp_rmem_min, |
| 1895 | .obj_size = sizeof(struct udp_sock), |
Eric Dumazet | 271b72c | 2008-10-29 02:11:14 -0700 | [diff] [blame] | 1896 | .slab_flags = SLAB_DESTROY_BY_RCU, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1897 | .h.udp_table = &udp_table, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1898 | #ifdef CONFIG_COMPAT |
| 1899 | .compat_setsockopt = compat_udp_setsockopt, |
| 1900 | .compat_getsockopt = compat_udp_getsockopt, |
| 1901 | #endif |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 1902 | }; |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 1903 | EXPORT_SYMBOL(udp_prot); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | |
| 1905 | /* ------------------------------------------------------------------------ */ |
| 1906 | #ifdef CONFIG_PROC_FS |
| 1907 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1908 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | { |
| 1910 | struct sock *sk; |
| 1911 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 1912 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1913 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 1914 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
| 1915 | ++state->bucket) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 1916 | struct hlist_nulls_node *node; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1917 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 1918 | |
| 1919 | if (hlist_nulls_empty(&hslot->head)) |
| 1920 | continue; |
| 1921 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1922 | spin_lock_bh(&hslot->lock); |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 1923 | sk_nulls_for_each(sk, node, &hslot->head) { |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1924 | if (!net_eq(sock_net(sk), net)) |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 1925 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | if (sk->sk_family == state->family) |
| 1927 | goto found; |
| 1928 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1929 | spin_unlock_bh(&hslot->lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1930 | } |
| 1931 | sk = NULL; |
| 1932 | found: |
| 1933 | return sk; |
| 1934 | } |
| 1935 | |
| 1936 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) |
| 1937 | { |
| 1938 | struct udp_iter_state *state = seq->private; |
Denis V. Lunev | 6f191ef | 2008-03-28 18:23:33 -0700 | [diff] [blame] | 1939 | struct net *net = seq_file_net(seq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | |
| 1941 | do { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 1942 | sk = sk_nulls_next(sk); |
YOSHIFUJI Hideaki | 878628f | 2008-03-26 03:57:35 +0900 | [diff] [blame] | 1943 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1944 | |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1945 | if (!sk) { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 1946 | if (state->bucket <= state->udp_table->mask) |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 1947 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1948 | return udp_get_first(seq, state->bucket + 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1949 | } |
| 1950 | return sk; |
| 1951 | } |
| 1952 | |
| 1953 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) |
| 1954 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1955 | struct sock *sk = udp_get_first(seq, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1956 | |
| 1957 | if (sk) |
Stephen Hemminger | 6516c65 | 2007-03-08 20:41:55 -0800 | [diff] [blame] | 1958 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1959 | --pos; |
| 1960 | return pos ? NULL : sk; |
| 1961 | } |
| 1962 | |
| 1963 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) |
| 1964 | { |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 1965 | struct udp_iter_state *state = seq->private; |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 1966 | state->bucket = MAX_UDP_PORTS; |
Vitaly Mayatskikh | 30842f2 | 2009-03-23 15:22:33 -0700 | [diff] [blame] | 1967 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 1968 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1969 | } |
| 1970 | |
| 1971 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| 1972 | { |
| 1973 | struct sock *sk; |
| 1974 | |
YOSHIFUJI Hideaki | b50660f | 2008-03-31 19:38:15 -0700 | [diff] [blame] | 1975 | if (v == SEQ_START_TOKEN) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1976 | sk = udp_get_idx(seq, 0); |
| 1977 | else |
| 1978 | sk = udp_get_next(seq, v); |
| 1979 | |
| 1980 | ++*pos; |
| 1981 | return sk; |
| 1982 | } |
| 1983 | |
| 1984 | static void udp_seq_stop(struct seq_file *seq, void *v) |
| 1985 | { |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1986 | struct udp_iter_state *state = seq->private; |
| 1987 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 1988 | if (state->bucket <= state->udp_table->mask) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 1989 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1990 | } |
| 1991 | |
| 1992 | static int udp_seq_open(struct inode *inode, struct file *file) |
| 1993 | { |
| 1994 | struct udp_seq_afinfo *afinfo = PDE(inode)->data; |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 1995 | struct udp_iter_state *s; |
| 1996 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 1998 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
| 1999 | sizeof(struct udp_iter_state)); |
| 2000 | if (err < 0) |
| 2001 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2002 | |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2003 | s = ((struct seq_file *)file->private_data)->private; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2004 | s->family = afinfo->family; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2005 | s->udp_table = afinfo->udp_table; |
Denis V. Lunev | a2be75c | 2008-03-28 18:25:06 -0700 | [diff] [blame] | 2006 | return err; |
Daniel Lezcano | a91275e | 2008-03-21 04:11:58 -0700 | [diff] [blame] | 2007 | } |
| 2008 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2009 | /* ------------------------------------------------------------------------ */ |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2010 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | { |
| 2012 | struct proc_dir_entry *p; |
| 2013 | int rc = 0; |
| 2014 | |
Denis V. Lunev | 3ba9441 | 2008-03-28 18:25:32 -0700 | [diff] [blame] | 2015 | afinfo->seq_fops.open = udp_seq_open; |
| 2016 | afinfo->seq_fops.read = seq_read; |
| 2017 | afinfo->seq_fops.llseek = seq_lseek; |
| 2018 | afinfo->seq_fops.release = seq_release_net; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2019 | |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2020 | afinfo->seq_ops.start = udp_seq_start; |
| 2021 | afinfo->seq_ops.next = udp_seq_next; |
| 2022 | afinfo->seq_ops.stop = udp_seq_stop; |
| 2023 | |
Denis V. Lunev | 84841c3 | 2008-05-02 04:10:08 -0700 | [diff] [blame] | 2024 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
| 2025 | &afinfo->seq_fops, afinfo); |
| 2026 | if (!p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2027 | rc = -ENOMEM; |
| 2028 | return rc; |
| 2029 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2030 | EXPORT_SYMBOL(udp_proc_register); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2031 | |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2032 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | { |
Daniel Lezcano | 0c96d8c | 2008-03-21 04:14:17 -0700 | [diff] [blame] | 2034 | proc_net_remove(net, afinfo->name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2035 | } |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2036 | EXPORT_SYMBOL(udp_proc_unregister); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2037 | |
| 2038 | /* ------------------------------------------------------------------------ */ |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2039 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
| 2040 | int bucket, int *len) |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2041 | { |
| 2042 | struct inet_sock *inet = inet_sk(sp); |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 2043 | __be32 dest = inet->inet_daddr; |
| 2044 | __be32 src = inet->inet_rcv_saddr; |
| 2045 | __u16 destp = ntohs(inet->inet_dport); |
| 2046 | __u16 srcp = ntohs(inet->inet_sport); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2047 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2048 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2049 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d%n", |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2050 | bucket, src, srcp, dest, destp, sp->sk_state, |
Eric Dumazet | 31e6d36 | 2009-06-17 19:05:41 -0700 | [diff] [blame] | 2051 | sk_wmem_alloc_get(sp), |
| 2052 | sk_rmem_alloc_get(sp), |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2053 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2054 | atomic_read(&sp->sk_refcnt), sp, |
| 2055 | atomic_read(&sp->sk_drops), len); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2056 | } |
| 2057 | |
| 2058 | int udp4_seq_show(struct seq_file *seq, void *v) |
| 2059 | { |
| 2060 | if (v == SEQ_START_TOKEN) |
| 2061 | seq_printf(seq, "%-127s\n", |
| 2062 | " sl local_address rem_address st tx_queue " |
| 2063 | "rx_queue tr tm->when retrnsmt uid timeout " |
Eric Dumazet | cb61cb9 | 2008-06-17 21:04:56 -0700 | [diff] [blame] | 2064 | "inode ref pointer drops"); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2065 | else { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2066 | struct udp_iter_state *state = seq->private; |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2067 | int len; |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2068 | |
Pavel Emelyanov | 5e659e4 | 2008-04-24 01:02:16 -0700 | [diff] [blame] | 2069 | udp4_format_sock(v, seq, state->bucket, &len); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2070 | seq_printf(seq, "%*s\n", 127 - len, ""); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2071 | } |
| 2072 | return 0; |
| 2073 | } |
| 2074 | |
| 2075 | /* ------------------------------------------------------------------------ */ |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2076 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2077 | .name = "udp", |
| 2078 | .family = AF_INET, |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2079 | .udp_table = &udp_table, |
Denis V. Lunev | 4ad96d3 | 2008-03-28 18:25:53 -0700 | [diff] [blame] | 2080 | .seq_fops = { |
| 2081 | .owner = THIS_MODULE, |
| 2082 | }, |
Denis V. Lunev | dda6192 | 2008-03-28 18:24:26 -0700 | [diff] [blame] | 2083 | .seq_ops = { |
| 2084 | .show = udp4_seq_show, |
| 2085 | }, |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2086 | }; |
| 2087 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2088 | static int __net_init udp4_proc_init_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2089 | { |
| 2090 | return udp_proc_register(net, &udp4_seq_afinfo); |
| 2091 | } |
| 2092 | |
Alexey Dobriyan | 2c8c1e7 | 2010-01-17 03:35:32 +0000 | [diff] [blame] | 2093 | static void __net_exit udp4_proc_exit_net(struct net *net) |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2094 | { |
| 2095 | udp_proc_unregister(net, &udp4_seq_afinfo); |
| 2096 | } |
| 2097 | |
| 2098 | static struct pernet_operations udp4_net_ops = { |
| 2099 | .init = udp4_proc_init_net, |
| 2100 | .exit = udp4_proc_exit_net, |
| 2101 | }; |
| 2102 | |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2103 | int __init udp4_proc_init(void) |
| 2104 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2105 | return register_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2106 | } |
| 2107 | |
| 2108 | void udp4_proc_exit(void) |
| 2109 | { |
Pavel Emelyanov | 15439fe | 2008-03-24 14:53:49 -0700 | [diff] [blame] | 2110 | unregister_pernet_subsys(&udp4_net_ops); |
David S. Miller | db8dac2 | 2008-03-06 16:22:02 -0800 | [diff] [blame] | 2111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2112 | #endif /* CONFIG_PROC_FS */ |
| 2113 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2114 | static __initdata unsigned long uhash_entries; |
| 2115 | static int __init set_uhash_entries(char *str) |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2116 | { |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2117 | if (!str) |
| 2118 | return 0; |
| 2119 | uhash_entries = simple_strtoul(str, &str, 0); |
| 2120 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
| 2121 | uhash_entries = UDP_HTABLE_SIZE_MIN; |
| 2122 | return 1; |
| 2123 | } |
| 2124 | __setup("uhash_entries=", set_uhash_entries); |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2125 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2126 | void __init udp_table_init(struct udp_table *table, const char *name) |
| 2127 | { |
| 2128 | unsigned int i; |
| 2129 | |
| 2130 | if (!CONFIG_BASE_SMALL) |
| 2131 | table->hash = alloc_large_system_hash(name, |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2132 | 2 * sizeof(struct udp_hslot), |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2133 | uhash_entries, |
| 2134 | 21, /* one slot per 2 MB */ |
| 2135 | 0, |
| 2136 | &table->log, |
| 2137 | &table->mask, |
| 2138 | 64 * 1024); |
| 2139 | /* |
| 2140 | * Make sure hash table has the minimum size |
| 2141 | */ |
| 2142 | if (CONFIG_BASE_SMALL || table->mask < UDP_HTABLE_SIZE_MIN - 1) { |
| 2143 | table->hash = kmalloc(UDP_HTABLE_SIZE_MIN * |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2144 | 2 * sizeof(struct udp_hslot), GFP_KERNEL); |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2145 | if (!table->hash) |
| 2146 | panic(name); |
| 2147 | table->log = ilog2(UDP_HTABLE_SIZE_MIN); |
| 2148 | table->mask = UDP_HTABLE_SIZE_MIN - 1; |
| 2149 | } |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2150 | table->hash2 = table->hash + (table->mask + 1); |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2151 | for (i = 0; i <= table->mask; i++) { |
Eric Dumazet | 88ab193 | 2008-11-16 19:39:21 -0800 | [diff] [blame] | 2152 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
Eric Dumazet | fdcc8aa9 | 2009-11-08 10:17:05 +0000 | [diff] [blame] | 2153 | table->hash[i].count = 0; |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2154 | spin_lock_init(&table->hash[i].lock); |
| 2155 | } |
Eric Dumazet | 512615b | 2009-11-08 10:17:58 +0000 | [diff] [blame] | 2156 | for (i = 0; i <= table->mask; i++) { |
| 2157 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); |
| 2158 | table->hash2[i].count = 0; |
| 2159 | spin_lock_init(&table->hash2[i].lock); |
| 2160 | } |
Eric Dumazet | 645ca70 | 2008-10-29 01:41:45 -0700 | [diff] [blame] | 2161 | } |
| 2162 | |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2163 | void __init udp_init(void) |
| 2164 | { |
Eric Dumazet | 8203efb | 2008-10-29 02:32:32 -0700 | [diff] [blame] | 2165 | unsigned long nr_pages, limit; |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2166 | |
Eric Dumazet | f86dcc5 | 2009-10-07 00:37:59 +0000 | [diff] [blame] | 2167 | udp_table_init(&udp_table, "UDP"); |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2168 | /* Set the pressure threshold up by the same strategy of TCP. It is a |
| 2169 | * fraction of global memory that is up to 1/2 at 256 MB, decreasing |
| 2170 | * toward zero with the amount of memory, with a floor of 128 pages. |
| 2171 | */ |
Eric Dumazet | 8203efb | 2008-10-29 02:32:32 -0700 | [diff] [blame] | 2172 | nr_pages = totalram_pages - totalhigh_pages; |
| 2173 | limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); |
| 2174 | limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); |
Hideo Aoki | 95766ff | 2007-12-31 00:29:24 -0800 | [diff] [blame] | 2175 | limit = max(limit, 128UL); |
| 2176 | sysctl_udp_mem[0] = limit / 4 * 3; |
| 2177 | sysctl_udp_mem[1] = limit; |
| 2178 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; |
| 2179 | |
| 2180 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; |
| 2181 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; |
| 2182 | } |
| 2183 | |
Sridhar Samudrala | d7ca4cc | 2009-07-09 08:09:47 +0000 | [diff] [blame] | 2184 | int udp4_ufo_send_check(struct sk_buff *skb) |
| 2185 | { |
| 2186 | const struct iphdr *iph; |
| 2187 | struct udphdr *uh; |
| 2188 | |
| 2189 | if (!pskb_may_pull(skb, sizeof(*uh))) |
| 2190 | return -EINVAL; |
| 2191 | |
| 2192 | iph = ip_hdr(skb); |
| 2193 | uh = udp_hdr(skb); |
| 2194 | |
| 2195 | uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
| 2196 | IPPROTO_UDP, 0); |
| 2197 | skb->csum_start = skb_transport_header(skb) - skb->head; |
| 2198 | skb->csum_offset = offsetof(struct udphdr, check); |
| 2199 | skb->ip_summed = CHECKSUM_PARTIAL; |
| 2200 | return 0; |
| 2201 | } |
| 2202 | |
| 2203 | struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, int features) |
| 2204 | { |
| 2205 | struct sk_buff *segs = ERR_PTR(-EINVAL); |
| 2206 | unsigned int mss; |
| 2207 | int offset; |
| 2208 | __wsum csum; |
| 2209 | |
| 2210 | mss = skb_shinfo(skb)->gso_size; |
| 2211 | if (unlikely(skb->len <= mss)) |
| 2212 | goto out; |
| 2213 | |
| 2214 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { |
| 2215 | /* Packet is from an untrusted source, reset gso_segs. */ |
| 2216 | int type = skb_shinfo(skb)->gso_type; |
| 2217 | |
| 2218 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || |
| 2219 | !(type & (SKB_GSO_UDP)))) |
| 2220 | goto out; |
| 2221 | |
| 2222 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); |
| 2223 | |
| 2224 | segs = NULL; |
| 2225 | goto out; |
| 2226 | } |
| 2227 | |
| 2228 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot |
| 2229 | * do checksum of UDP packets sent as multiple IP fragments. |
| 2230 | */ |
| 2231 | offset = skb->csum_start - skb_headroom(skb); |
Eric Dumazet | c482c56 | 2009-07-17 00:26:32 +0000 | [diff] [blame] | 2232 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
Sridhar Samudrala | d7ca4cc | 2009-07-09 08:09:47 +0000 | [diff] [blame] | 2233 | offset += skb->csum_offset; |
| 2234 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); |
| 2235 | skb->ip_summed = CHECKSUM_NONE; |
| 2236 | |
| 2237 | /* Fragment the skb. IP headers of the fragments are updated in |
| 2238 | * inet_gso_segment() |
| 2239 | */ |
| 2240 | segs = skb_segment(skb, features); |
| 2241 | out: |
| 2242 | return segs; |
| 2243 | } |
| 2244 | |