blob: f50de5d5218ddce45c578f6f05a78de5e13ea8c0 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
8 * Version: $Id: udp.c,v 1.102 2002/02/01 22:01:04 davem Exp $
9 *
Jesper Juhl02c30a82005-05-05 16:16:16 -070010 * Authors: Ross Biro
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
13 * Alan Cox, <Alan.Cox@linux.org>
14 * Hirokazu Takahashi, <taka@valinux.co.jp>
15 *
16 * Fixes:
17 * Alan Cox : verify_area() calls
18 * Alan Cox : stopped close while in use off icmp
19 * messages. Not a fix but a botch that
20 * for udp at least is 'valid'.
21 * Alan Cox : Fixed icmp handling properly
22 * Alan Cox : Correct error for oversized datagrams
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090023 * Alan Cox : Tidied select() semantics.
24 * Alan Cox : udp_err() fixed properly, also now
Linus Torvalds1da177e2005-04-16 15:20:36 -070025 * select and read wake correctly on errors
26 * Alan Cox : udp_send verify_area moved to avoid mem leak
27 * Alan Cox : UDP can count its memory
28 * Alan Cox : send to an unknown connection causes
29 * an ECONNREFUSED off the icmp, but
30 * does NOT close.
31 * Alan Cox : Switched to new sk_buff handlers. No more backlog!
32 * Alan Cox : Using generic datagram code. Even smaller and the PEEK
33 * bug no longer crashes it.
34 * Fred Van Kempen : Net2e support for sk->broadcast.
35 * Alan Cox : Uses skb_free_datagram
36 * Alan Cox : Added get/set sockopt support.
37 * Alan Cox : Broadcasting without option set returns EACCES.
38 * Alan Cox : No wakeup calls. Instead we now use the callbacks.
39 * Alan Cox : Use ip_tos and ip_ttl
40 * Alan Cox : SNMP Mibs
41 * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support.
42 * Matt Dillon : UDP length checks.
43 * Alan Cox : Smarter af_inet used properly.
44 * Alan Cox : Use new kernel side addressing.
45 * Alan Cox : Incorrect return on truncated datagram receive.
46 * Arnt Gulbrandsen : New udp_send and stuff
47 * Alan Cox : Cache last socket
48 * Alan Cox : Route cache
49 * Jon Peatfield : Minor efficiency fix to sendto().
50 * Mike Shaver : RFC1122 checks.
51 * Alan Cox : Nonblocking error fix.
52 * Willy Konynenberg : Transparent proxying support.
53 * Mike McLagan : Routing by source
54 * David S. Miller : New socket lookup architecture.
55 * Last socket cache retained as it
56 * does have a high hit rate.
57 * Olaf Kirch : Don't linearise iovec on sendmsg.
58 * Andi Kleen : Some cleanups, cache destination entry
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090059 * for connect.
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 * Vitaly E. Lavrov : Transparent proxy revived after year coma.
61 * Melvin Smith : Check msg_name not msg_namelen in sendto(),
62 * return ENOTCONN for unconnected sockets (POSIX)
63 * Janos Farkas : don't deliver multi/broadcasts to a different
64 * bound-to-device socket
65 * Hirokazu Takahashi : HW checksumming for outgoing UDP
66 * datagrams.
67 * Hirokazu Takahashi : sendfile() on UDP works now.
68 * Arnaldo C. Melo : convert /proc/net/udp to seq_file
69 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
70 * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind
71 * a single port at the same time.
72 * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support
James Chapman342f0232007-06-27 15:37:46 -070073 * James Chapman : Add L2TP encapsulation type.
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 *
75 *
76 * This program is free software; you can redistribute it and/or
77 * modify it under the terms of the GNU General Public License
78 * as published by the Free Software Foundation; either version
79 * 2 of the License, or (at your option) any later version.
80 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090081
Linus Torvalds1da177e2005-04-16 15:20:36 -070082#include <asm/system.h>
83#include <asm/uaccess.h>
84#include <asm/ioctls.h>
85#include <linux/types.h>
86#include <linux/fcntl.h>
87#include <linux/module.h>
88#include <linux/socket.h>
89#include <linux/sockios.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020090#include <linux/igmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070091#include <linux/in.h>
92#include <linux/errno.h>
93#include <linux/timer.h>
94#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#include <linux/inet.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070096#include <linux/netdevice.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070097#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#include <linux/skbuff.h>
99#include <linux/proc_fs.h>
100#include <linux/seq_file.h>
Eric W. Biederman457c4cb2007-09-12 12:01:34 +0200101#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#include <net/icmp.h>
103#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104#include <net/checksum.h>
105#include <net/xfrm.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800106#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107
108/*
109 * Snmp MIB for the UDP layer
110 */
111
Eric Dumazetba899662005-08-26 12:05:31 -0700112DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113
114struct hlist_head udp_hash[UDP_HTABLE_SIZE];
115DEFINE_RWLOCK(udp_hash_lock);
116
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700117static inline int __udp_lib_lport_inuse(__u16 num,
118 const struct hlist_head udptable[])
Gerrit Renker25030a72006-08-26 20:06:05 -0700119{
120 struct sock *sk;
121 struct hlist_node *node;
122
David S. Millerdf2bc452007-06-05 15:18:43 -0700123 sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)])
124 if (sk->sk_hash == num)
Gerrit Renker25030a72006-08-26 20:06:05 -0700125 return 1;
126 return 0;
127}
128
129/**
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800130 * __udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6
Gerrit Renker25030a72006-08-26 20:06:05 -0700131 *
132 * @sk: socket struct in question
133 * @snum: port number to look up
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800134 * @udptable: hash list table, must be of UDP_HTABLE_SIZE
David S. Millerdf2bc452007-06-05 15:18:43 -0700135 * @saddr_comp: AF-dependent comparison of bound local IP addresses
Gerrit Renker25030a72006-08-26 20:06:05 -0700136 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800137int __udp_lib_get_port(struct sock *sk, unsigned short snum,
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700138 struct hlist_head udptable[],
David S. Millerdf2bc452007-06-05 15:18:43 -0700139 int (*saddr_comp)(const struct sock *sk1,
140 const struct sock *sk2 ) )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141{
142 struct hlist_node *node;
Gerrit Renker25030a72006-08-26 20:06:05 -0700143 struct hlist_head *head;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 struct sock *sk2;
Gerrit Renker25030a72006-08-26 20:06:05 -0700145 int error = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146
147 write_lock_bh(&udp_hash_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700149 if (!snum) {
Anton Arapova25de532007-10-18 22:00:17 -0700150 int i, low, high, remaining;
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700151 unsigned rover, best, best_size_so_far;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700153 inet_get_local_port_range(&low, &high);
Anton Arapova25de532007-10-18 22:00:17 -0700154 remaining = (high - low) + 1;
Stephen Hemminger227b60f2007-10-10 17:30:46 -0700155
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700156 best_size_so_far = UINT_MAX;
Anton Arapova25de532007-10-18 22:00:17 -0700157 best = rover = net_random() % remaining + low;
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700158
159 /* 1st pass: look for empty (or shortest) hash chain */
160 for (i = 0; i < UDP_HTABLE_SIZE; i++) {
161 int size = 0;
162
163 head = &udptable[rover & (UDP_HTABLE_SIZE - 1)];
164 if (hlist_empty(head))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 goto gotit;
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700166
David S. Miller5c668702006-12-22 11:42:26 -0800167 sk_for_each(sk2, node, head) {
168 if (++size >= best_size_so_far)
169 goto next;
170 }
171 best_size_so_far = size;
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700172 best = rover;
David S. Miller5c668702006-12-22 11:42:26 -0800173 next:
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700174 /* fold back if end of range */
175 if (++rover > high)
176 rover = low + ((rover - low)
177 & (UDP_HTABLE_SIZE - 1));
178
179
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700181
182 /* 2nd pass: find hole in shortest hash chain */
183 rover = best;
184 for (i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++) {
185 if (! __udp_lib_lport_inuse(rover, udptable))
186 goto gotit;
187 rover += UDP_HTABLE_SIZE;
188 if (rover > high)
189 rover = low + ((rover - low)
190 & (UDP_HTABLE_SIZE - 1));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 }
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700192
193
194 /* All ports in use! */
195 goto fail;
196
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197gotit:
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700198 snum = rover;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 } else {
David S. Millerdf2bc452007-06-05 15:18:43 -0700200 head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Gerrit Renker25030a72006-08-26 20:06:05 -0700202 sk_for_each(sk2, node, head)
David S. Millerdf2bc452007-06-05 15:18:43 -0700203 if (sk2->sk_hash == snum &&
204 sk2 != sk &&
205 (!sk2->sk_reuse || !sk->sk_reuse) &&
206 (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
207 || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
208 (*saddr_comp)(sk, sk2) )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700211
Gerrit Renker25030a72006-08-26 20:06:05 -0700212 inet_sk(sk)->num = snum;
David S. Millerdf2bc452007-06-05 15:18:43 -0700213 sk->sk_hash = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 if (sk_unhashed(sk)) {
David S. Millerdf2bc452007-06-05 15:18:43 -0700215 head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
Gerrit Renker25030a72006-08-26 20:06:05 -0700216 sk_add_node(sk, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 sock_prot_inc_use(sk->sk_prot);
218 }
Gerrit Renker25030a72006-08-26 20:06:05 -0700219 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220fail:
221 write_unlock_bh(&udp_hash_lock);
Gerrit Renker25030a72006-08-26 20:06:05 -0700222 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
Stephen Hemminger3fbe0702007-03-08 20:46:41 -0800225int udp_get_port(struct sock *sk, unsigned short snum,
David S. Millerdf2bc452007-06-05 15:18:43 -0700226 int (*scmp)(const struct sock *, const struct sock *))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800227{
Stephen Hemminger32c1da72007-08-24 23:09:41 -0700228 return __udp_lib_get_port(sk, snum, udp_hash, scmp);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800229}
230
David S. Millerdf2bc452007-06-05 15:18:43 -0700231int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
Gerrit Renker25030a72006-08-26 20:06:05 -0700232{
233 struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
234
235 return ( !ipv6_only_sock(sk2) &&
236 (!inet1->rcv_saddr || !inet2->rcv_saddr ||
237 inet1->rcv_saddr == inet2->rcv_saddr ));
238}
239
240static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
241{
David S. Millerdf2bc452007-06-05 15:18:43 -0700242 return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
Gerrit Renker25030a72006-08-26 20:06:05 -0700243}
244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
246 * harder than this. -DaveM
247 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800248static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport,
249 __be32 daddr, __be16 dport,
250 int dif, struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251{
252 struct sock *sk, *result = NULL;
253 struct hlist_node *node;
David S. Millerdf2bc452007-06-05 15:18:43 -0700254 unsigned short hnum = ntohs(dport);
255 int badness = -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800257 read_lock(&udp_hash_lock);
David S. Millerdf2bc452007-06-05 15:18:43 -0700258 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 struct inet_sock *inet = inet_sk(sk);
260
David S. Millerdf2bc452007-06-05 15:18:43 -0700261 if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) {
262 int score = (sk->sk_family == PF_INET ? 1 : 0);
263 if (inet->rcv_saddr) {
264 if (inet->rcv_saddr != daddr)
265 continue;
266 score+=2;
267 }
268 if (inet->daddr) {
269 if (inet->daddr != saddr)
270 continue;
271 score+=2;
272 }
273 if (inet->dport) {
274 if (inet->dport != sport)
275 continue;
276 score+=2;
277 }
278 if (sk->sk_bound_dev_if) {
279 if (sk->sk_bound_dev_if != dif)
280 continue;
281 score+=2;
282 }
283 if (score == 9) {
284 result = sk;
285 break;
286 } else if (score > badness) {
287 result = sk;
288 badness = score;
289 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 }
291 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800292 if (result)
293 sock_hold(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 read_unlock(&udp_hash_lock);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800295 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296}
297
David S. Millerdf2bc452007-06-05 15:18:43 -0700298static inline struct sock *udp_v4_mcast_next(struct sock *sk,
299 __be16 loc_port, __be32 loc_addr,
David S. Millerb7b5f482007-04-30 13:35:29 -0700300 __be16 rmt_port, __be32 rmt_addr,
301 int dif)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 struct hlist_node *node;
304 struct sock *s = sk;
David S. Millerdf2bc452007-06-05 15:18:43 -0700305 unsigned short hnum = ntohs(loc_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
307 sk_for_each_from(s, node) {
308 struct inet_sock *inet = inet_sk(s);
309
Eric Dumazet95f30b32007-02-09 15:44:52 -0800310 if (s->sk_hash != hnum ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 (inet->daddr && inet->daddr != rmt_addr) ||
312 (inet->dport != rmt_port && inet->dport) ||
313 (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
314 ipv6_only_sock(s) ||
315 (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
316 continue;
317 if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
318 continue;
319 goto found;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900320 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 s = NULL;
322found:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900323 return s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324}
325
326/*
327 * This routine is called by the ICMP module when it gets some
328 * sort of error condition. If err < 0 then the socket should
329 * be closed and the error returned to the user. If err > 0
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900330 * it's just the icmp type << 8 | icmp code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 * Header points to the ip header of the error packet. We move
332 * on past this. Then (as it used to claim before adjustment)
333 * header points to the first 8 bytes of the udp header. We need
334 * to find the appropriate port.
335 */
336
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800337void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338{
339 struct inet_sock *inet;
340 struct iphdr *iph = (struct iphdr*)skb->data;
341 struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
Arnaldo Carvalho de Melo88c76642007-03-13 14:43:18 -0300342 const int type = icmp_hdr(skb)->type;
343 const int code = icmp_hdr(skb)->code;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 struct sock *sk;
345 int harderr;
346 int err;
347
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800348 sk = __udp4_lib_lookup(iph->daddr, uh->dest, iph->saddr, uh->source,
349 skb->dev->ifindex, udptable );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 if (sk == NULL) {
351 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900352 return; /* No socket for error */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 }
354
355 err = 0;
356 harderr = 0;
357 inet = inet_sk(sk);
358
359 switch (type) {
360 default:
361 case ICMP_TIME_EXCEEDED:
362 err = EHOSTUNREACH;
363 break;
364 case ICMP_SOURCE_QUENCH:
365 goto out;
366 case ICMP_PARAMETERPROB:
367 err = EPROTO;
368 harderr = 1;
369 break;
370 case ICMP_DEST_UNREACH:
371 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
372 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
373 err = EMSGSIZE;
374 harderr = 1;
375 break;
376 }
377 goto out;
378 }
379 err = EHOSTUNREACH;
380 if (code <= NR_ICMP_UNREACH) {
381 harderr = icmp_err_convert[code].fatal;
382 err = icmp_err_convert[code].errno;
383 }
384 break;
385 }
386
387 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900388 * RFC1122: OK. Passes ICMP errors back to application, as per
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 * 4.1.3.3.
390 */
391 if (!inet->recverr) {
392 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
393 goto out;
394 } else {
395 ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
396 }
397 sk->sk_err = err;
398 sk->sk_error_report(sk);
399out:
400 sock_put(sk);
401}
402
Stephen Hemminger3fbe0702007-03-08 20:46:41 -0800403void udp_err(struct sk_buff *skb, u32 info)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800404{
405 return __udp4_lib_err(skb, info, udp_hash);
406}
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408/*
409 * Throw away all pending data and cancel the corking. Socket is locked.
410 */
411static void udp_flush_pending_frames(struct sock *sk)
412{
413 struct udp_sock *up = udp_sk(sk);
414
415 if (up->pending) {
416 up->len = 0;
417 up->pending = 0;
418 ip_flush_pending_frames(sk);
419 }
420}
421
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800422/**
423 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
424 * @sk: socket we are sending on
425 * @skb: sk_buff containing the filled-in UDP header
426 * (checksum field must be zeroed out)
427 */
428static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
429 __be32 src, __be32 dst, int len )
430{
Al Viro6b116872006-11-14 21:28:24 -0800431 unsigned int offset;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300432 struct udphdr *uh = udp_hdr(skb);
Al Viro6b116872006-11-14 21:28:24 -0800433 __wsum csum = 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800434
435 if (skb_queue_len(&sk->sk_write_queue) == 1) {
436 /*
437 * Only one fragment on the socket.
438 */
Herbert Xu663ead32007-04-09 11:59:07 -0700439 skb->csum_start = skb_transport_header(skb) - skb->head;
Al Viroff1dcad2006-11-20 18:07:29 -0800440 skb->csum_offset = offsetof(struct udphdr, check);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800441 uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
442 } else {
443 /*
444 * HW-checksum won't work as there are two or more
445 * fragments on the socket so that all csums of sk_buffs
446 * should be together
447 */
Arnaldo Carvalho de Meloea2ae172007-04-25 17:55:53 -0700448 offset = skb_transport_offset(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800449 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
450
451 skb->ip_summed = CHECKSUM_NONE;
452
453 skb_queue_walk(&sk->sk_write_queue, skb) {
454 csum = csum_add(csum, skb->csum);
455 }
456
457 uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
458 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800459 uh->check = CSUM_MANGLED_0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800460 }
461}
462
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463/*
464 * Push out all pending data as one UDP datagram. Socket is locked.
465 */
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800466static int udp_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467{
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800468 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 struct inet_sock *inet = inet_sk(sk);
470 struct flowi *fl = &inet->cork.fl;
471 struct sk_buff *skb;
472 struct udphdr *uh;
473 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100474 int is_udplite = IS_UDPLITE(sk);
Al Viro8e5200f2006-11-20 18:06:37 -0800475 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477 /* Grab the skbuff where UDP header space exists. */
478 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
479 goto out;
480
481 /*
482 * Create a UDP header
483 */
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300484 uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 uh->source = fl->fl_ip_sport;
486 uh->dest = fl->fl_ip_dport;
487 uh->len = htons(up->len);
488 uh->check = 0;
489
Wang Chenb2bf1e22007-12-03 22:34:16 +1100490 if (is_udplite) /* UDP-Lite */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800491 csum = udplite_csum_outgoing(sk, skb);
492
493 else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
494
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 skb->ip_summed = CHECKSUM_NONE;
496 goto send;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800498 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800500 udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
501 goto send;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800503 } else /* `normal' UDP */
504 csum = udp_csum_outgoing(sk, skb);
505
506 /* add protocol-dependent pseudo-header */
507 uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
508 sk->sk_protocol, csum );
509 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800510 uh->check = CSUM_MANGLED_0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512send:
513 err = ip_push_pending_frames(sk);
514out:
515 up->len = 0;
516 up->pending = 0;
YOSHIFUJI Hideaki2a0c6c92007-09-14 17:15:19 -0700517 if (!err)
Wang Chenb2bf1e22007-12-03 22:34:16 +1100518 UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 return err;
520}
521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
523 size_t len)
524{
525 struct inet_sock *inet = inet_sk(sk);
526 struct udp_sock *up = udp_sk(sk);
527 int ulen = len;
528 struct ipcm_cookie ipc;
529 struct rtable *rt = NULL;
530 int free = 0;
531 int connected = 0;
Al Viro3ca3c682006-09-27 18:28:07 -0700532 __be32 daddr, faddr, saddr;
Al Viro734ab872006-09-27 18:37:41 -0700533 __be16 dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 u8 tos;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100535 int err, is_udplite = IS_UDPLITE(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800537 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
539 if (len > 0xFFFF)
540 return -EMSGSIZE;
541
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900542 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 * Check the flags.
544 */
545
546 if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
547 return -EOPNOTSUPP;
548
549 ipc.opt = NULL;
550
551 if (up->pending) {
552 /*
553 * There are pending frames.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900554 * The socket lock must be held while it's corked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 */
556 lock_sock(sk);
557 if (likely(up->pending)) {
558 if (unlikely(up->pending != AF_INET)) {
559 release_sock(sk);
560 return -EINVAL;
561 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900562 goto do_append_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 }
564 release_sock(sk);
565 }
566 ulen += sizeof(struct udphdr);
567
568 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900569 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 */
571 if (msg->msg_name) {
572 struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
573 if (msg->msg_namelen < sizeof(*usin))
574 return -EINVAL;
575 if (usin->sin_family != AF_INET) {
576 if (usin->sin_family != AF_UNSPEC)
577 return -EAFNOSUPPORT;
578 }
579
580 daddr = usin->sin_addr.s_addr;
581 dport = usin->sin_port;
582 if (dport == 0)
583 return -EINVAL;
584 } else {
585 if (sk->sk_state != TCP_ESTABLISHED)
586 return -EDESTADDRREQ;
587 daddr = inet->daddr;
588 dport = inet->dport;
589 /* Open fast path for connected socket.
590 Route will not be used, if at least one option is set.
591 */
592 connected = 1;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900593 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 ipc.addr = inet->saddr;
595
596 ipc.oif = sk->sk_bound_dev_if;
597 if (msg->msg_controllen) {
598 err = ip_cmsg_send(msg, &ipc);
599 if (err)
600 return err;
601 if (ipc.opt)
602 free = 1;
603 connected = 0;
604 }
605 if (!ipc.opt)
606 ipc.opt = inet->opt;
607
608 saddr = ipc.addr;
609 ipc.addr = faddr = daddr;
610
611 if (ipc.opt && ipc.opt->srr) {
612 if (!daddr)
613 return -EINVAL;
614 faddr = ipc.opt->faddr;
615 connected = 0;
616 }
617 tos = RT_TOS(inet->tos);
618 if (sock_flag(sk, SOCK_LOCALROUTE) ||
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900619 (msg->msg_flags & MSG_DONTROUTE) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 (ipc.opt && ipc.opt->is_strictroute)) {
621 tos |= RTO_ONLINK;
622 connected = 0;
623 }
624
625 if (MULTICAST(daddr)) {
626 if (!ipc.oif)
627 ipc.oif = inet->mc_index;
628 if (!saddr)
629 saddr = inet->mc_addr;
630 connected = 0;
631 }
632
633 if (connected)
634 rt = (struct rtable*)sk_dst_check(sk, 0);
635
636 if (rt == NULL) {
637 struct flowi fl = { .oif = ipc.oif,
638 .nl_u = { .ip4_u =
639 { .daddr = faddr,
640 .saddr = saddr,
641 .tos = tos } },
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800642 .proto = sk->sk_protocol,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 .uli_u = { .ports =
644 { .sport = inet->sport,
645 .dport = dport } } };
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700646 security_sk_classify_flow(sk, &fl);
David S. Miller8eb90862007-02-08 02:09:21 -0800647 err = ip_route_output_flow(&rt, &fl, sk, 1);
Wei Dong584bdf82007-05-31 22:49:28 -0700648 if (err) {
649 if (err == -ENETUNREACH)
650 IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 goto out;
Wei Dong584bdf82007-05-31 22:49:28 -0700652 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
654 err = -EACCES;
655 if ((rt->rt_flags & RTCF_BROADCAST) &&
656 !sock_flag(sk, SOCK_BROADCAST))
657 goto out;
658 if (connected)
659 sk_dst_set(sk, dst_clone(&rt->u.dst));
660 }
661
662 if (msg->msg_flags&MSG_CONFIRM)
663 goto do_confirm;
664back_from_confirm:
665
666 saddr = rt->rt_src;
667 if (!ipc.addr)
668 daddr = ipc.addr = rt->rt_dst;
669
670 lock_sock(sk);
671 if (unlikely(up->pending)) {
672 /* The socket is already corked while preparing it. */
673 /* ... which is an evident application bug. --ANK */
674 release_sock(sk);
675
Patrick McHardy64ce2072005-08-09 20:50:53 -0700676 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 err = -EINVAL;
678 goto out;
679 }
680 /*
681 * Now cork the socket to pend data.
682 */
683 inet->cork.fl.fl4_dst = daddr;
684 inet->cork.fl.fl_ip_dport = dport;
685 inet->cork.fl.fl4_src = saddr;
686 inet->cork.fl.fl_ip_sport = inet->sport;
687 up->pending = AF_INET;
688
689do_append_data:
690 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800691 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
692 err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
693 sizeof(struct udphdr), &ipc, rt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700694 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
695 if (err)
696 udp_flush_pending_frames(sk);
697 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800698 err = udp_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -0700699 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
700 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 release_sock(sk);
702
703out:
704 ip_rt_put(rt);
705 if (free)
706 kfree(ipc.opt);
YOSHIFUJI Hideaki2a0c6c92007-09-14 17:15:19 -0700707 if (!err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 return len;
Martin Bligh81aa6462006-08-14 23:57:10 -0700709 /*
710 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
711 * ENOBUFS might not be good (it's not tunable per se), but otherwise
712 * we don't have a good statistic (IpOutDiscards but it can be too many
713 * things). We could add another new stat but at least for now that
714 * seems like overkill.
715 */
716 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800717 UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
Martin Bligh81aa6462006-08-14 23:57:10 -0700718 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719 return err;
720
721do_confirm:
722 dst_confirm(&rt->u.dst);
723 if (!(msg->msg_flags&MSG_PROBE) || len)
724 goto back_from_confirm;
725 err = 0;
726 goto out;
727}
728
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800729int udp_sendpage(struct sock *sk, struct page *page, int offset,
730 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731{
732 struct udp_sock *up = udp_sk(sk);
733 int ret;
734
735 if (!up->pending) {
736 struct msghdr msg = { .msg_flags = flags|MSG_MORE };
737
738 /* Call udp_sendmsg to specify destination address which
739 * sendpage interface can't pass.
740 * This will succeed only when the socket is connected.
741 */
742 ret = udp_sendmsg(NULL, sk, &msg, 0);
743 if (ret < 0)
744 return ret;
745 }
746
747 lock_sock(sk);
748
749 if (unlikely(!up->pending)) {
750 release_sock(sk);
751
Patrick McHardy64ce2072005-08-09 20:50:53 -0700752 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 return -EINVAL;
754 }
755
756 ret = ip_append_page(sk, page, offset, size, flags);
757 if (ret == -EOPNOTSUPP) {
758 release_sock(sk);
759 return sock_no_sendpage(sk->sk_socket, page, offset,
760 size, flags);
761 }
762 if (ret < 0) {
763 udp_flush_pending_frames(sk);
764 goto out;
765 }
766
767 up->len += size;
768 if (!(up->corkflag || (flags&MSG_MORE)))
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800769 ret = udp_push_pending_frames(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 if (!ret)
771 ret = size;
772out:
773 release_sock(sk);
774 return ret;
775}
776
777/*
778 * IOCTL requests applicable to the UDP protocol
779 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900780
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
782{
Stephen Hemminger6516c652007-03-08 20:41:55 -0800783 switch (cmd) {
784 case SIOCOUTQ:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 {
Stephen Hemminger6516c652007-03-08 20:41:55 -0800786 int amount = atomic_read(&sk->sk_wmem_alloc);
787 return put_user(amount, (int __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 }
Stephen Hemminger6516c652007-03-08 20:41:55 -0800789
790 case SIOCINQ:
791 {
792 struct sk_buff *skb;
793 unsigned long amount;
794
795 amount = 0;
796 spin_lock_bh(&sk->sk_receive_queue.lock);
797 skb = skb_peek(&sk->sk_receive_queue);
798 if (skb != NULL) {
799 /*
800 * We will only return the amount
801 * of this packet since that is all
802 * that will be read.
803 */
804 amount = skb->len - sizeof(struct udphdr);
805 }
806 spin_unlock_bh(&sk->sk_receive_queue.lock);
807 return put_user(amount, (int __user *)arg);
808 }
809
810 default:
811 return -ENOIOCTLCMD;
812 }
813
814 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815}
816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817/*
818 * This should be easy, if there is something there we
819 * return it, otherwise we block.
820 */
821
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800822int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900823 size_t len, int noblock, int flags, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824{
825 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900826 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
827 struct sk_buff *skb;
Herbert Xu759e5d02007-03-25 20:10:56 -0700828 unsigned int ulen, copied;
829 int err;
830 int is_udplite = IS_UDPLITE(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831
832 /*
833 * Check any passed addresses
834 */
835 if (addr_len)
836 *addr_len=sizeof(*sin);
837
838 if (flags & MSG_ERRQUEUE)
839 return ip_recv_error(sk, msg, len);
840
841try_again:
842 skb = skb_recv_datagram(sk, flags, noblock, &err);
843 if (!skb)
844 goto out;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900845
Herbert Xu759e5d02007-03-25 20:10:56 -0700846 ulen = skb->len - sizeof(struct udphdr);
847 copied = len;
848 if (copied > ulen)
849 copied = ulen;
850 else if (copied < ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800853 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700854 * If checksum is needed at all, try to do it while copying the
855 * data. If the data is truncated, or if we only want a partial
856 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800857 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800858
Herbert Xu759e5d02007-03-25 20:10:56 -0700859 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
860 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800862 }
863
Herbert Xu60476372007-04-09 11:59:39 -0700864 if (skb_csum_unnecessary(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800865 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
866 msg->msg_iov, copied );
867 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700868 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
869
870 if (err == -EINVAL)
871 goto csum_copy_err;
872 }
873
874 if (err)
875 goto out_free;
876
Wang Chencb759942007-12-03 22:33:28 +1100877 UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
878
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879 sock_recv_timestamp(msg, sk, skb);
880
881 /* Copy the address. */
882 if (sin)
883 {
884 sin->sin_family = AF_INET;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300885 sin->sin_port = udp_hdr(skb)->source;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -0700886 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900888 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 if (inet->cmsg_flags)
890 ip_cmsg_recv(msg, skb);
891
892 err = copied;
893 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700894 err = ulen;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900895
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896out_free:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900897 skb_free_datagram(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898out:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900899 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
901csum_copy_err:
Herbert Xu27ab2562007-12-05 01:51:58 -0800902 if (!skb_kill_datagram(sk, skb, flags))
903 UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700904
905 if (noblock)
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900906 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 goto try_again;
908}
909
910
911int udp_disconnect(struct sock *sk, int flags)
912{
913 struct inet_sock *inet = inet_sk(sk);
914 /*
915 * 1003.1g - break association.
916 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900917
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918 sk->sk_state = TCP_CLOSE;
919 inet->daddr = 0;
920 inet->dport = 0;
921 sk->sk_bound_dev_if = 0;
922 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
923 inet_reset_saddr(sk);
924
925 if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
926 sk->sk_prot->unhash(sk);
927 inet->sport = 0;
928 }
929 sk_dst_reset(sk);
930 return 0;
931}
932
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933/* returns:
934 * -1: error
935 * 0: success
936 * >0: "udp encap" protocol resubmission
937 *
938 * Note that in the success and error cases, the skb is assumed to
939 * have either been requeued or freed.
940 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800941int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942{
943 struct udp_sock *up = udp_sk(sk);
Martin Bligh81aa6462006-08-14 23:57:10 -0700944 int rc;
Wang Chenb2bf1e22007-12-03 22:34:16 +1100945 int is_udplite = IS_UDPLITE(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700946
947 /*
948 * Charge it to the socket, dropping if the queue is full.
949 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800950 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
951 goto drop;
Patrick McHardyb59c2702006-01-06 23:06:10 -0800952 nf_reset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953
954 if (up->encap_type) {
955 /*
James Chapman067b2072007-07-05 17:08:05 -0700956 * This is an encapsulation socket so pass the skb to
957 * the socket's udp_encap_rcv() hook. Otherwise, just
958 * fall through and pass this up the UDP socket.
959 * up->encap_rcv() returns the following value:
960 * =0 if skb was successfully passed to the encap
961 * handler or was discarded by it.
962 * >0 if skb should be passed on to UDP.
963 * <0 if skb should be resubmitted as proto -N
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
James Chapman067b2072007-07-05 17:08:05 -0700966 /* if we're overly short, let UDP handle it */
Patrick McHardy3be550f2007-07-10 23:06:43 -0700967 if (skb->len > sizeof(struct udphdr) &&
968 up->encap_rcv != NULL) {
James Chapman067b2072007-07-05 17:08:05 -0700969 int ret;
970
971 ret = (*up->encap_rcv)(sk, skb);
Wang Chencb759942007-12-03 22:33:28 +1100972 if (ret <= 0)
James Chapman067b2072007-07-05 17:08:05 -0700973 return -ret;
James Chapman342f0232007-06-27 15:37:46 -0700974 }
975
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 /* FALLTHROUGH -- it's a UDP Packet */
977 }
978
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800979 /*
980 * UDP-Lite specific tests, ignored on UDP sockets
981 */
Wang Chenb2bf1e22007-12-03 22:34:16 +1100982 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800983
984 /*
985 * MIB statistics other than incrementing the error count are
986 * disabled for the following two types of errors: these depend
987 * on the application settings, not on the functioning of the
988 * protocol stack as such.
989 *
990 * RFC 3828 here recommends (sec 3.3): "There should also be a
991 * way ... to ... at least let the receiving application block
992 * delivery of packets with coverage values less than a value
993 * provided by the application."
994 */
995 if (up->pcrlen == 0) { /* full coverage was set */
996 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
997 "%d while full coverage %d requested\n",
998 UDP_SKB_CB(skb)->cscov, skb->len);
999 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001001 /* The next case involves violating the min. coverage requested
1002 * by the receiver. This is subtle: if receiver wants x and x is
1003 * greater than the buffersize/MTU then receiver will complain
1004 * that it wants x while sender emits packets of smaller size y.
1005 * Therefore the above ...()->partial_cov statement is essential.
1006 */
1007 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
1008 LIMIT_NETDEBUG(KERN_WARNING
1009 "UDPLITE: coverage %d too small, need min %d\n",
1010 UDP_SKB_CB(skb)->cscov, up->pcrlen);
1011 goto drop;
1012 }
1013 }
1014
Herbert Xu759e5d02007-03-25 20:10:56 -07001015 if (sk->sk_filter) {
1016 if (udp_lib_checksum_complete(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001017 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 }
1019
Martin Bligh81aa6462006-08-14 23:57:10 -07001020 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
1021 /* Note that an ENOMEM error is charged twice */
1022 if (rc == -ENOMEM)
Wang Chenb2bf1e22007-12-03 22:34:16 +11001023 UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001024 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001026
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001028
1029drop:
Wang Chenb2bf1e22007-12-03 22:34:16 +11001030 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001031 kfree_skb(skb);
1032 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033}
1034
1035/*
1036 * Multicasts and broadcasts go to each listener.
1037 *
1038 * Note: called only from the BH handler context,
1039 * so we don't need to lock the hashes.
1040 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001041static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
1042 struct udphdr *uh,
1043 __be32 saddr, __be32 daddr,
1044 struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001045{
David S. Millerdf2bc452007-06-05 15:18:43 -07001046 struct sock *sk;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001047 int dif;
1048
1049 read_lock(&udp_hash_lock);
David S. Millerdf2bc452007-06-05 15:18:43 -07001050 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
1051 dif = skb->dev->ifindex;
1052 sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
Eric Dumazet6aaf47f2007-04-30 00:26:00 -07001053 if (sk) {
David S. Millerdf2bc452007-06-05 15:18:43 -07001054 struct sock *sknext = NULL;
1055
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 do {
1057 struct sk_buff *skb1 = skb;
David S. Millerdf2bc452007-06-05 15:18:43 -07001058
1059 sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
1060 uh->source, saddr, dif);
Stephen Hemminger6516c652007-03-08 20:41:55 -08001061 if (sknext)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 skb1 = skb_clone(skb, GFP_ATOMIC);
1063
Stephen Hemminger6516c652007-03-08 20:41:55 -08001064 if (skb1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001065 int ret = udp_queue_rcv_skb(sk, skb1);
1066 if (ret > 0)
David S. Millerdf2bc452007-06-05 15:18:43 -07001067 /* we should probably re-process instead
1068 * of dropping packets here. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 kfree_skb(skb1);
1070 }
1071 sk = sknext;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001072 } while (sknext);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073 } else
1074 kfree_skb(skb);
1075 read_unlock(&udp_hash_lock);
1076 return 0;
1077}
1078
1079/* Initialize UDP checksum. If exited with zero value (success),
1080 * CHECKSUM_UNNECESSARY means, that no more checks are required.
1081 * Otherwise, csum completion requires chacksumming packet body,
1082 * including udp header and folding it to skb->csum.
1083 */
Herbert Xu759e5d02007-03-25 20:10:56 -07001084static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
1085 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086{
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001087 const struct iphdr *iph;
Herbert Xu759e5d02007-03-25 20:10:56 -07001088 int err;
1089
1090 UDP_SKB_CB(skb)->partial_cov = 0;
1091 UDP_SKB_CB(skb)->cscov = skb->len;
1092
1093 if (proto == IPPROTO_UDPLITE) {
1094 err = udplite_checksum_init(skb, uh);
1095 if (err)
1096 return err;
1097 }
1098
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001099 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 if (uh->check == 0) {
1101 skb->ip_summed = CHECKSUM_UNNECESSARY;
Patrick McHardy84fa7932006-08-29 16:44:56 -07001102 } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001103 if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
1104 proto, skb->csum))
Herbert Xufb286bb2005-11-10 13:01:24 -08001105 skb->ip_summed = CHECKSUM_UNNECESSARY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 }
Herbert Xu60476372007-04-09 11:59:39 -07001107 if (!skb_csum_unnecessary(skb))
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001108 skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -07001109 skb->len, proto, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 /* Probably, we should checksum udp header (it should be in cache
1111 * in any case) and data in tiny packets (< rx copybreak).
1112 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001113
Herbert Xu759e5d02007-03-25 20:10:56 -07001114 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115}
1116
1117/*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001118 * All we need to do is get the socket, and then do a checksum.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001120
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001121int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
Herbert Xu759e5d02007-03-25 20:10:56 -07001122 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001124 struct sock *sk;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -03001125 struct udphdr *uh = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 unsigned short ulen;
1127 struct rtable *rt = (struct rtable*)skb->dst;
Arnaldo Carvalho de Meloeddc9ec2007-04-20 22:47:35 -07001128 __be32 saddr = ip_hdr(skb)->saddr;
1129 __be32 daddr = ip_hdr(skb)->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001130
1131 /*
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001132 * Validate the packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 */
1134 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001135 goto drop; /* No space for header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136
1137 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001138 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001139 goto short_packet;
1140
Herbert Xu759e5d02007-03-25 20:10:56 -07001141 if (proto == IPPROTO_UDP) {
1142 /* UDP validates ulen. */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001143 if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
1144 goto short_packet;
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -03001145 uh = udp_hdr(skb);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001146 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001147
Herbert Xu759e5d02007-03-25 20:10:56 -07001148 if (udp4_csum_init(skb, uh, proto))
1149 goto csum_error;
1150
Stephen Hemminger6516c652007-03-08 20:41:55 -08001151 if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001152 return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001154 sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
Vlad Yasevichfee9dee2007-10-25 18:54:46 -07001155 inet_iif(skb), udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001156
1157 if (sk != NULL) {
1158 int ret = udp_queue_rcv_skb(sk, skb);
1159 sock_put(sk);
1160
1161 /* a return value > 0 means to resubmit the input, but
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001162 * it wants the return to be -protocol, or 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 */
1164 if (ret > 0)
1165 return -ret;
1166 return 0;
1167 }
1168
1169 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
1170 goto drop;
Patrick McHardyb59c2702006-01-06 23:06:10 -08001171 nf_reset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172
1173 /* No socket. Drop packet silently, if checksum is wrong */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001174 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 goto csum_error;
1176
Herbert Xu759e5d02007-03-25 20:10:56 -07001177 UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
1179
1180 /*
1181 * Hmm. We got an UDP packet to a port to which we
1182 * don't wanna listen. Ignore it.
1183 */
1184 kfree_skb(skb);
Stephen Hemminger6516c652007-03-08 20:41:55 -08001185 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187short_packet:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001188 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
Herbert Xu759e5d02007-03-25 20:10:56 -07001189 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Patrick McHardy64ce2072005-08-09 20:50:53 -07001190 NIPQUAD(saddr),
1191 ntohs(uh->source),
1192 ulen,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001193 skb->len,
Patrick McHardy64ce2072005-08-09 20:50:53 -07001194 NIPQUAD(daddr),
1195 ntohs(uh->dest));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001196 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
1198csum_error:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001199 /*
1200 * RFC1122: OK. Discards the bad packet silently (as far as
1201 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001203 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
Herbert Xu759e5d02007-03-25 20:10:56 -07001204 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Patrick McHardy64ce2072005-08-09 20:50:53 -07001205 NIPQUAD(saddr),
1206 ntohs(uh->source),
1207 NIPQUAD(daddr),
1208 ntohs(uh->dest),
1209 ulen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001210drop:
Herbert Xu759e5d02007-03-25 20:10:56 -07001211 UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 kfree_skb(skb);
Stephen Hemminger6516c652007-03-08 20:41:55 -08001213 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214}
1215
Stephen Hemminger3fbe0702007-03-08 20:46:41 -08001216int udp_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001217{
Herbert Xu759e5d02007-03-25 20:10:56 -07001218 return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001219}
1220
1221int udp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222{
1223 lock_sock(sk);
1224 udp_flush_pending_frames(sk);
1225 release_sock(sk);
1226 return 0;
1227}
1228
1229/*
1230 * Socket option code for UDP
1231 */
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001232int udp_lib_setsockopt(struct sock *sk, int level, int optname,
1233 char __user *optval, int optlen,
1234 int (*push_pending_frames)(struct sock *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001235{
1236 struct udp_sock *up = udp_sk(sk);
1237 int val;
1238 int err = 0;
Wang Chenb2bf1e22007-12-03 22:34:16 +11001239 int is_udplite = IS_UDPLITE(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001240
Stephen Hemminger6516c652007-03-08 20:41:55 -08001241 if (optlen<sizeof(int))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001242 return -EINVAL;
1243
1244 if (get_user(val, (int __user *)optval))
1245 return -EFAULT;
1246
Stephen Hemminger6516c652007-03-08 20:41:55 -08001247 switch (optname) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248 case UDP_CORK:
1249 if (val != 0) {
1250 up->corkflag = 1;
1251 } else {
1252 up->corkflag = 0;
1253 lock_sock(sk);
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001254 (*push_pending_frames)(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255 release_sock(sk);
1256 }
1257 break;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001258
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 case UDP_ENCAP:
1260 switch (val) {
1261 case 0:
1262 case UDP_ENCAP_ESPINUDP:
1263 case UDP_ENCAP_ESPINUDP_NON_IKE:
James Chapman067b2072007-07-05 17:08:05 -07001264 up->encap_rcv = xfrm4_udp_encap_rcv;
1265 /* FALLTHROUGH */
James Chapman342f0232007-06-27 15:37:46 -07001266 case UDP_ENCAP_L2TPINUDP:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001267 up->encap_type = val;
1268 break;
1269 default:
1270 err = -ENOPROTOOPT;
1271 break;
1272 }
1273 break;
1274
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001275 /*
1276 * UDP-Lite's partial checksum coverage (RFC 3828).
1277 */
1278 /* The sender sets actual checksum coverage length via this option.
1279 * The case coverage > packet length is handled by send module. */
1280 case UDPLITE_SEND_CSCOV:
Wang Chenb2bf1e22007-12-03 22:34:16 +11001281 if (!is_udplite) /* Disable the option on UDP sockets */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001282 return -ENOPROTOOPT;
1283 if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
1284 val = 8;
1285 up->pcslen = val;
1286 up->pcflag |= UDPLITE_SEND_CC;
1287 break;
1288
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001289 /* The receiver specifies a minimum checksum coverage value. To make
1290 * sense, this should be set to at least 8 (as done below). If zero is
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001291 * used, this again means full checksum coverage. */
1292 case UDPLITE_RECV_CSCOV:
Wang Chenb2bf1e22007-12-03 22:34:16 +11001293 if (!is_udplite) /* Disable the option on UDP sockets */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001294 return -ENOPROTOOPT;
1295 if (val != 0 && val < 8) /* Avoid silly minimal values. */
1296 val = 8;
1297 up->pcrlen = val;
1298 up->pcflag |= UDPLITE_RECV_CC;
1299 break;
1300
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301 default:
1302 err = -ENOPROTOOPT;
1303 break;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001304 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305
1306 return err;
1307}
1308
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001309int udp_setsockopt(struct sock *sk, int level, int optname,
1310 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001311{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001312 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001313 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1314 udp_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001315 return ip_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001316}
1317
1318#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001319int compat_udp_setsockopt(struct sock *sk, int level, int optname,
1320 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001321{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001322 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001323 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1324 udp_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001325 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001326}
1327#endif
1328
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001329int udp_lib_getsockopt(struct sock *sk, int level, int optname,
1330 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331{
1332 struct udp_sock *up = udp_sk(sk);
1333 int val, len;
1334
Stephen Hemminger6516c652007-03-08 20:41:55 -08001335 if (get_user(len,optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001336 return -EFAULT;
1337
1338 len = min_t(unsigned int, len, sizeof(int));
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001339
Stephen Hemminger6516c652007-03-08 20:41:55 -08001340 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 return -EINVAL;
1342
Stephen Hemminger6516c652007-03-08 20:41:55 -08001343 switch (optname) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 case UDP_CORK:
1345 val = up->corkflag;
1346 break;
1347
1348 case UDP_ENCAP:
1349 val = up->encap_type;
1350 break;
1351
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001352 /* The following two cannot be changed on UDP sockets, the return is
1353 * always 0 (which corresponds to the full checksum coverage of UDP). */
1354 case UDPLITE_SEND_CSCOV:
1355 val = up->pcslen;
1356 break;
1357
1358 case UDPLITE_RECV_CSCOV:
1359 val = up->pcrlen;
1360 break;
1361
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362 default:
1363 return -ENOPROTOOPT;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001364 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365
Stephen Hemminger6516c652007-03-08 20:41:55 -08001366 if (put_user(len, optlen))
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001367 return -EFAULT;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001368 if (copy_to_user(optval, &val,len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001369 return -EFAULT;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001370 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371}
1372
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001373int udp_getsockopt(struct sock *sk, int level, int optname,
1374 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001375{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001376 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001377 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001378 return ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001379}
1380
1381#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001382int compat_udp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001383 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001384{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001385 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001386 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001387 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001388}
1389#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390/**
1391 * udp_poll - wait for a UDP event.
1392 * @file - file struct
1393 * @sock - socket
1394 * @wait - poll table
1395 *
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001396 * This is same as datagram poll, except for the special case of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001397 * blocking sockets. If application is using a blocking fd
1398 * and a packet with checksum error is in the queue;
1399 * then it could get return from select indicating data available
1400 * but then block when reading it. Add special case code
1401 * to work around these arguably broken applications.
1402 */
1403unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
1404{
1405 unsigned int mask = datagram_poll(file, sock, wait);
1406 struct sock *sk = sock->sk;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001407 int is_lite = IS_UDPLITE(sk);
1408
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 /* Check for false positives due to checksum errors */
1410 if ( (mask & POLLRDNORM) &&
1411 !(file->f_flags & O_NONBLOCK) &&
1412 !(sk->sk_shutdown & RCV_SHUTDOWN)){
1413 struct sk_buff_head *rcvq = &sk->sk_receive_queue;
1414 struct sk_buff *skb;
1415
Herbert Xu208d8982005-05-30 15:50:15 -07001416 spin_lock_bh(&rcvq->lock);
Herbert Xu759e5d02007-03-25 20:10:56 -07001417 while ((skb = skb_peek(rcvq)) != NULL &&
1418 udp_lib_checksum_complete(skb)) {
1419 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_lite);
1420 __skb_unlink(skb, rcvq);
1421 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422 }
Herbert Xu208d8982005-05-30 15:50:15 -07001423 spin_unlock_bh(&rcvq->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 /* nothing to see, move along */
1426 if (skb == NULL)
1427 mask &= ~(POLLIN | POLLRDNORM);
1428 }
1429
1430 return mask;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001431
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432}
1433
Eric Dumazet47a31a62007-11-05 23:39:16 -08001434DEFINE_PROTO_INUSE(udp)
1435
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436struct proto udp_prot = {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001437 .name = "UDP",
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001438 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001439 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001440 .connect = ip4_datagram_connect,
1441 .disconnect = udp_disconnect,
1442 .ioctl = udp_ioctl,
1443 .destroy = udp_destroy_sock,
1444 .setsockopt = udp_setsockopt,
1445 .getsockopt = udp_getsockopt,
1446 .sendmsg = udp_sendmsg,
1447 .recvmsg = udp_recvmsg,
1448 .sendpage = udp_sendpage,
1449 .backlog_rcv = udp_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001450 .hash = udp_lib_hash,
1451 .unhash = udp_lib_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001452 .get_port = udp_v4_get_port,
1453 .obj_size = sizeof(struct udp_sock),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001454#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001455 .compat_setsockopt = compat_udp_setsockopt,
1456 .compat_getsockopt = compat_udp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001457#endif
Eric Dumazet47a31a62007-11-05 23:39:16 -08001458 REF_PROTO_INUSE(udp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459};
1460
1461/* ------------------------------------------------------------------------ */
1462#ifdef CONFIG_PROC_FS
1463
1464static struct sock *udp_get_first(struct seq_file *seq)
1465{
1466 struct sock *sk;
1467 struct udp_iter_state *state = seq->private;
1468
1469 for (state->bucket = 0; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) {
1470 struct hlist_node *node;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001471 sk_for_each(sk, node, state->hashtable + state->bucket) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 if (sk->sk_family == state->family)
1473 goto found;
1474 }
1475 }
1476 sk = NULL;
1477found:
1478 return sk;
1479}
1480
1481static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
1482{
1483 struct udp_iter_state *state = seq->private;
1484
1485 do {
1486 sk = sk_next(sk);
1487try_again:
1488 ;
1489 } while (sk && sk->sk_family != state->family);
1490
1491 if (!sk && ++state->bucket < UDP_HTABLE_SIZE) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001492 sk = sk_head(state->hashtable + state->bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001493 goto try_again;
1494 }
1495 return sk;
1496}
1497
1498static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos)
1499{
1500 struct sock *sk = udp_get_first(seq);
1501
1502 if (sk)
Stephen Hemminger6516c652007-03-08 20:41:55 -08001503 while (pos && (sk = udp_get_next(seq, sk)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 --pos;
1505 return pos ? NULL : sk;
1506}
1507
1508static void *udp_seq_start(struct seq_file *seq, loff_t *pos)
1509{
1510 read_lock(&udp_hash_lock);
1511 return *pos ? udp_get_idx(seq, *pos-1) : (void *)1;
1512}
1513
1514static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1515{
1516 struct sock *sk;
1517
1518 if (v == (void *)1)
1519 sk = udp_get_idx(seq, 0);
1520 else
1521 sk = udp_get_next(seq, v);
1522
1523 ++*pos;
1524 return sk;
1525}
1526
1527static void udp_seq_stop(struct seq_file *seq, void *v)
1528{
1529 read_unlock(&udp_hash_lock);
1530}
1531
1532static int udp_seq_open(struct inode *inode, struct file *file)
1533{
1534 struct udp_seq_afinfo *afinfo = PDE(inode)->data;
1535 struct seq_file *seq;
1536 int rc = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001537 struct udp_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001538
1539 if (!s)
1540 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 s->family = afinfo->family;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001542 s->hashtable = afinfo->hashtable;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 s->seq_ops.start = udp_seq_start;
1544 s->seq_ops.next = udp_seq_next;
1545 s->seq_ops.show = afinfo->seq_show;
1546 s->seq_ops.stop = udp_seq_stop;
1547
1548 rc = seq_open(file, &s->seq_ops);
1549 if (rc)
1550 goto out_kfree;
1551
1552 seq = file->private_data;
1553 seq->private = s;
1554out:
1555 return rc;
1556out_kfree:
1557 kfree(s);
1558 goto out;
1559}
1560
1561/* ------------------------------------------------------------------------ */
1562int udp_proc_register(struct udp_seq_afinfo *afinfo)
1563{
1564 struct proc_dir_entry *p;
1565 int rc = 0;
1566
1567 if (!afinfo)
1568 return -EINVAL;
1569 afinfo->seq_fops->owner = afinfo->owner;
1570 afinfo->seq_fops->open = udp_seq_open;
1571 afinfo->seq_fops->read = seq_read;
1572 afinfo->seq_fops->llseek = seq_lseek;
1573 afinfo->seq_fops->release = seq_release_private;
1574
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001575 p = proc_net_fops_create(&init_net, afinfo->name, S_IRUGO, afinfo->seq_fops);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576 if (p)
1577 p->data = afinfo;
1578 else
1579 rc = -ENOMEM;
1580 return rc;
1581}
1582
1583void udp_proc_unregister(struct udp_seq_afinfo *afinfo)
1584{
1585 if (!afinfo)
1586 return;
Eric W. Biederman457c4cb2007-09-12 12:01:34 +02001587 proc_net_remove(&init_net, afinfo->name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001588 memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
1589}
1590
1591/* ------------------------------------------------------------------------ */
1592static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
1593{
1594 struct inet_sock *inet = inet_sk(sp);
Al Viro734ab872006-09-27 18:37:41 -07001595 __be32 dest = inet->daddr;
1596 __be32 src = inet->rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001597 __u16 destp = ntohs(inet->dport);
1598 __u16 srcp = ntohs(inet->sport);
1599
1600 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
1601 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001602 bucket, src, srcp, dest, destp, sp->sk_state,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001603 atomic_read(&sp->sk_wmem_alloc),
1604 atomic_read(&sp->sk_rmem_alloc),
1605 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
1606 atomic_read(&sp->sk_refcnt), sp);
1607}
1608
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001609int udp4_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001610{
1611 if (v == SEQ_START_TOKEN)
1612 seq_printf(seq, "%-127s\n",
1613 " sl local_address rem_address st tx_queue "
1614 "rx_queue tr tm->when retrnsmt uid timeout "
1615 "inode");
1616 else {
1617 char tmpbuf[129];
1618 struct udp_iter_state *state = seq->private;
1619
1620 udp4_format_sock(v, tmpbuf, state->bucket);
1621 seq_printf(seq, "%-127s\n", tmpbuf);
1622 }
1623 return 0;
1624}
1625
1626/* ------------------------------------------------------------------------ */
1627static struct file_operations udp4_seq_fops;
1628static struct udp_seq_afinfo udp4_seq_afinfo = {
1629 .owner = THIS_MODULE,
1630 .name = "udp",
1631 .family = AF_INET,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001632 .hashtable = udp_hash,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001633 .seq_show = udp4_seq_show,
1634 .seq_fops = &udp4_seq_fops,
1635};
1636
1637int __init udp4_proc_init(void)
1638{
1639 return udp_proc_register(&udp4_seq_afinfo);
1640}
1641
1642void udp4_proc_exit(void)
1643{
1644 udp_proc_unregister(&udp4_seq_afinfo);
1645}
1646#endif /* CONFIG_PROC_FS */
1647
1648EXPORT_SYMBOL(udp_disconnect);
1649EXPORT_SYMBOL(udp_hash);
1650EXPORT_SYMBOL(udp_hash_lock);
1651EXPORT_SYMBOL(udp_ioctl);
Gerrit Renker25030a72006-08-26 20:06:05 -07001652EXPORT_SYMBOL(udp_get_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001653EXPORT_SYMBOL(udp_prot);
1654EXPORT_SYMBOL(udp_sendmsg);
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001655EXPORT_SYMBOL(udp_lib_getsockopt);
1656EXPORT_SYMBOL(udp_lib_setsockopt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001657EXPORT_SYMBOL(udp_poll);
1658
1659#ifdef CONFIG_PROC_FS
1660EXPORT_SYMBOL(udp_proc_register);
1661EXPORT_SYMBOL(udp_proc_unregister);
1662#endif