blob: 2a246de6a671fe923356cdaf8d020e1fcb1d9bb1 [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
73 *
74 *
75 * This program is free software; you can redistribute it and/or
76 * modify it under the terms of the GNU General Public License
77 * as published by the Free Software Foundation; either version
78 * 2 of the License, or (at your option) any later version.
79 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +090080
Linus Torvalds1da177e2005-04-16 15:20:36 -070081#include <asm/system.h>
82#include <asm/uaccess.h>
83#include <asm/ioctls.h>
84#include <linux/types.h>
85#include <linux/fcntl.h>
86#include <linux/module.h>
87#include <linux/socket.h>
88#include <linux/sockios.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020089#include <linux/igmp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070090#include <linux/in.h>
91#include <linux/errno.h>
92#include <linux/timer.h>
93#include <linux/mm.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070094#include <linux/inet.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070095#include <linux/netdevice.h>
Arnaldo Carvalho de Meloc752f072005-08-09 20:08:28 -070096#include <net/tcp_states.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070097#include <linux/skbuff.h>
98#include <linux/proc_fs.h>
99#include <linux/seq_file.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100#include <net/icmp.h>
101#include <net/route.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102#include <net/checksum.h>
103#include <net/xfrm.h>
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800104#include "udp_impl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105
106/*
107 * Snmp MIB for the UDP layer
108 */
109
Eric Dumazetba899662005-08-26 12:05:31 -0700110DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111
112struct hlist_head udp_hash[UDP_HTABLE_SIZE];
113DEFINE_RWLOCK(udp_hash_lock);
114
David S. Millerbed53ea2006-08-26 20:06:49 -0700115static int udp_port_rover;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116
Al Viro8e5200f2006-11-20 18:06:37 -0800117static inline int __udp_lib_lport_inuse(__u16 num, struct hlist_head udptable[])
Gerrit Renker25030a72006-08-26 20:06:05 -0700118{
119 struct sock *sk;
120 struct hlist_node *node;
121
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800122 sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)])
Gerrit Renker25030a72006-08-26 20:06:05 -0700123 if (inet_sk(sk)->num == num)
124 return 1;
125 return 0;
126}
127
128/**
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800129 * __udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6
Gerrit Renker25030a72006-08-26 20:06:05 -0700130 *
131 * @sk: socket struct in question
132 * @snum: port number to look up
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800133 * @udptable: hash list table, must be of UDP_HTABLE_SIZE
134 * @port_rover: pointer to record of last unallocated port
Gerrit Renker25030a72006-08-26 20:06:05 -0700135 * @saddr_comp: AF-dependent comparison of bound local IP addresses
136 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800137int __udp_lib_get_port(struct sock *sk, unsigned short snum,
138 struct hlist_head udptable[], int *port_rover,
139 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);
148 if (snum == 0) {
149 int best_size_so_far, best, result, i;
150
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800151 if (*port_rover > sysctl_local_port_range[1] ||
152 *port_rover < sysctl_local_port_range[0])
153 *port_rover = sysctl_local_port_range[0];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 best_size_so_far = 32767;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800155 best = result = *port_rover;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 int size;
158
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800159 head = &udptable[result & (UDP_HTABLE_SIZE - 1)];
Gerrit Renker25030a72006-08-26 20:06:05 -0700160 if (hlist_empty(head)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (result > sysctl_local_port_range[1])
162 result = sysctl_local_port_range[0] +
163 ((result - sysctl_local_port_range[0]) &
164 (UDP_HTABLE_SIZE - 1));
165 goto gotit;
166 }
167 size = 0;
David S. Miller5c668702006-12-22 11:42:26 -0800168 sk_for_each(sk2, node, head) {
169 if (++size >= best_size_so_far)
170 goto next;
171 }
172 best_size_so_far = size;
173 best = result;
174 next:
175 ;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 }
177 result = best;
178 for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) {
179 if (result > sysctl_local_port_range[1])
180 result = sysctl_local_port_range[0]
181 + ((result - sysctl_local_port_range[0]) &
182 (UDP_HTABLE_SIZE - 1));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800183 if (! __udp_lib_lport_inuse(result, udptable))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 break;
185 }
186 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
187 goto fail;
188gotit:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800189 *port_rover = snum = result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 } else {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800191 head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192
Gerrit Renker25030a72006-08-26 20:06:05 -0700193 sk_for_each(sk2, node, head)
194 if (inet_sk(sk2)->num == snum &&
195 sk2 != sk &&
196 (!sk2->sk_reuse || !sk->sk_reuse) &&
197 (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
198 || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800199 (*saddr_comp)(sk, sk2) )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 }
Gerrit Renker25030a72006-08-26 20:06:05 -0700202 inet_sk(sk)->num = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (sk_unhashed(sk)) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800204 head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
Gerrit Renker25030a72006-08-26 20:06:05 -0700205 sk_add_node(sk, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 sock_prot_inc_use(sk->sk_prot);
207 }
Gerrit Renker25030a72006-08-26 20:06:05 -0700208 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209fail:
210 write_unlock_bh(&udp_hash_lock);
Gerrit Renker25030a72006-08-26 20:06:05 -0700211 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212}
213
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800214__inline__ int udp_get_port(struct sock *sk, unsigned short snum,
215 int (*scmp)(const struct sock *, const struct sock *))
216{
217 return __udp_lib_get_port(sk, snum, udp_hash, &udp_port_rover, scmp);
218}
219
220inline int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
Gerrit Renker25030a72006-08-26 20:06:05 -0700221{
222 struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
223
224 return ( !ipv6_only_sock(sk2) &&
225 (!inet1->rcv_saddr || !inet2->rcv_saddr ||
226 inet1->rcv_saddr == inet2->rcv_saddr ));
227}
228
229static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
230{
231 return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
232}
233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
235 * harder than this. -DaveM
236 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800237static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport,
238 __be32 daddr, __be16 dport,
239 int dif, struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240{
241 struct sock *sk, *result = NULL;
242 struct hlist_node *node;
243 unsigned short hnum = ntohs(dport);
244 int badness = -1;
245
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800246 read_lock(&udp_hash_lock);
247 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 struct inet_sock *inet = inet_sk(sk);
249
250 if (inet->num == hnum && !ipv6_only_sock(sk)) {
251 int score = (sk->sk_family == PF_INET ? 1 : 0);
252 if (inet->rcv_saddr) {
253 if (inet->rcv_saddr != daddr)
254 continue;
255 score+=2;
256 }
257 if (inet->daddr) {
258 if (inet->daddr != saddr)
259 continue;
260 score+=2;
261 }
262 if (inet->dport) {
263 if (inet->dport != sport)
264 continue;
265 score+=2;
266 }
267 if (sk->sk_bound_dev_if) {
268 if (sk->sk_bound_dev_if != dif)
269 continue;
270 score+=2;
271 }
272 if(score == 9) {
273 result = sk;
274 break;
275 } else if(score > badness) {
276 result = sk;
277 badness = score;
278 }
279 }
280 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800281 if (result)
282 sock_hold(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 read_unlock(&udp_hash_lock);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800284 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285}
286
287static inline struct sock *udp_v4_mcast_next(struct sock *sk,
Al Viro734ab872006-09-27 18:37:41 -0700288 __be16 loc_port, __be32 loc_addr,
289 __be16 rmt_port, __be32 rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 int dif)
291{
292 struct hlist_node *node;
293 struct sock *s = sk;
294 unsigned short hnum = ntohs(loc_port);
295
296 sk_for_each_from(s, node) {
297 struct inet_sock *inet = inet_sk(s);
298
299 if (inet->num != hnum ||
300 (inet->daddr && inet->daddr != rmt_addr) ||
301 (inet->dport != rmt_port && inet->dport) ||
302 (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
303 ipv6_only_sock(s) ||
304 (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
305 continue;
306 if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
307 continue;
308 goto found;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900309 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 s = NULL;
311found:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900312 return s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313}
314
315/*
316 * This routine is called by the ICMP module when it gets some
317 * sort of error condition. If err < 0 then the socket should
318 * be closed and the error returned to the user. If err > 0
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900319 * it's just the icmp type << 8 | icmp code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 * Header points to the ip header of the error packet. We move
321 * on past this. Then (as it used to claim before adjustment)
322 * header points to the first 8 bytes of the udp header. We need
323 * to find the appropriate port.
324 */
325
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800326void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327{
328 struct inet_sock *inet;
329 struct iphdr *iph = (struct iphdr*)skb->data;
330 struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
331 int type = skb->h.icmph->type;
332 int code = skb->h.icmph->code;
333 struct sock *sk;
334 int harderr;
335 int err;
336
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800337 sk = __udp4_lib_lookup(iph->daddr, uh->dest, iph->saddr, uh->source,
338 skb->dev->ifindex, udptable );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 if (sk == NULL) {
340 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900341 return; /* No socket for error */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 }
343
344 err = 0;
345 harderr = 0;
346 inet = inet_sk(sk);
347
348 switch (type) {
349 default:
350 case ICMP_TIME_EXCEEDED:
351 err = EHOSTUNREACH;
352 break;
353 case ICMP_SOURCE_QUENCH:
354 goto out;
355 case ICMP_PARAMETERPROB:
356 err = EPROTO;
357 harderr = 1;
358 break;
359 case ICMP_DEST_UNREACH:
360 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
361 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
362 err = EMSGSIZE;
363 harderr = 1;
364 break;
365 }
366 goto out;
367 }
368 err = EHOSTUNREACH;
369 if (code <= NR_ICMP_UNREACH) {
370 harderr = icmp_err_convert[code].fatal;
371 err = icmp_err_convert[code].errno;
372 }
373 break;
374 }
375
376 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900377 * RFC1122: OK. Passes ICMP errors back to application, as per
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 * 4.1.3.3.
379 */
380 if (!inet->recverr) {
381 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
382 goto out;
383 } else {
384 ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
385 }
386 sk->sk_err = err;
387 sk->sk_error_report(sk);
388out:
389 sock_put(sk);
390}
391
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800392__inline__ void udp_err(struct sk_buff *skb, u32 info)
393{
394 return __udp4_lib_err(skb, info, udp_hash);
395}
396
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397/*
398 * Throw away all pending data and cancel the corking. Socket is locked.
399 */
400static void udp_flush_pending_frames(struct sock *sk)
401{
402 struct udp_sock *up = udp_sk(sk);
403
404 if (up->pending) {
405 up->len = 0;
406 up->pending = 0;
407 ip_flush_pending_frames(sk);
408 }
409}
410
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800411/**
412 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
413 * @sk: socket we are sending on
414 * @skb: sk_buff containing the filled-in UDP header
415 * (checksum field must be zeroed out)
416 */
417static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
418 __be32 src, __be32 dst, int len )
419{
Al Viro6b116872006-11-14 21:28:24 -0800420 unsigned int offset;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800421 struct udphdr *uh = skb->h.uh;
Al Viro6b116872006-11-14 21:28:24 -0800422 __wsum csum = 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800423
424 if (skb_queue_len(&sk->sk_write_queue) == 1) {
425 /*
426 * Only one fragment on the socket.
427 */
Al Viroff1dcad2006-11-20 18:07:29 -0800428 skb->csum_offset = offsetof(struct udphdr, check);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800429 uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
430 } else {
431 /*
432 * HW-checksum won't work as there are two or more
433 * fragments on the socket so that all csums of sk_buffs
434 * should be together
435 */
436 offset = skb->h.raw - skb->data;
437 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
438
439 skb->ip_summed = CHECKSUM_NONE;
440
441 skb_queue_walk(&sk->sk_write_queue, skb) {
442 csum = csum_add(csum, skb->csum);
443 }
444
445 uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
446 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800447 uh->check = CSUM_MANGLED_0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800448 }
449}
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451/*
452 * Push out all pending data as one UDP datagram. Socket is locked.
453 */
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800454static int udp_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800456 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 struct inet_sock *inet = inet_sk(sk);
458 struct flowi *fl = &inet->cork.fl;
459 struct sk_buff *skb;
460 struct udphdr *uh;
461 int err = 0;
Al Viro8e5200f2006-11-20 18:06:37 -0800462 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
464 /* Grab the skbuff where UDP header space exists. */
465 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
466 goto out;
467
468 /*
469 * Create a UDP header
470 */
471 uh = skb->h.uh;
472 uh->source = fl->fl_ip_sport;
473 uh->dest = fl->fl_ip_dport;
474 uh->len = htons(up->len);
475 uh->check = 0;
476
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800477 if (up->pcflag) /* UDP-Lite */
478 csum = udplite_csum_outgoing(sk, skb);
479
480 else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
481
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 skb->ip_summed = CHECKSUM_NONE;
483 goto send;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800485 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800487 udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
488 goto send;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800490 } else /* `normal' UDP */
491 csum = udp_csum_outgoing(sk, skb);
492
493 /* add protocol-dependent pseudo-header */
494 uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
495 sk->sk_protocol, csum );
496 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800497 uh->check = CSUM_MANGLED_0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800498
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499send:
500 err = ip_push_pending_frames(sk);
501out:
502 up->len = 0;
503 up->pending = 0;
504 return err;
505}
506
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
508 size_t len)
509{
510 struct inet_sock *inet = inet_sk(sk);
511 struct udp_sock *up = udp_sk(sk);
512 int ulen = len;
513 struct ipcm_cookie ipc;
514 struct rtable *rt = NULL;
515 int free = 0;
516 int connected = 0;
Al Viro3ca3c682006-09-27 18:28:07 -0700517 __be32 daddr, faddr, saddr;
Al Viro734ab872006-09-27 18:37:41 -0700518 __be16 dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 u8 tos;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800520 int err, is_udplite = up->pcflag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800522 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 if (len > 0xFFFF)
525 return -EMSGSIZE;
526
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900527 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 * Check the flags.
529 */
530
531 if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
532 return -EOPNOTSUPP;
533
534 ipc.opt = NULL;
535
536 if (up->pending) {
537 /*
538 * There are pending frames.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900539 * The socket lock must be held while it's corked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 */
541 lock_sock(sk);
542 if (likely(up->pending)) {
543 if (unlikely(up->pending != AF_INET)) {
544 release_sock(sk);
545 return -EINVAL;
546 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900547 goto do_append_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 }
549 release_sock(sk);
550 }
551 ulen += sizeof(struct udphdr);
552
553 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900554 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 */
556 if (msg->msg_name) {
557 struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
558 if (msg->msg_namelen < sizeof(*usin))
559 return -EINVAL;
560 if (usin->sin_family != AF_INET) {
561 if (usin->sin_family != AF_UNSPEC)
562 return -EAFNOSUPPORT;
563 }
564
565 daddr = usin->sin_addr.s_addr;
566 dport = usin->sin_port;
567 if (dport == 0)
568 return -EINVAL;
569 } else {
570 if (sk->sk_state != TCP_ESTABLISHED)
571 return -EDESTADDRREQ;
572 daddr = inet->daddr;
573 dport = inet->dport;
574 /* Open fast path for connected socket.
575 Route will not be used, if at least one option is set.
576 */
577 connected = 1;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900578 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579 ipc.addr = inet->saddr;
580
581 ipc.oif = sk->sk_bound_dev_if;
582 if (msg->msg_controllen) {
583 err = ip_cmsg_send(msg, &ipc);
584 if (err)
585 return err;
586 if (ipc.opt)
587 free = 1;
588 connected = 0;
589 }
590 if (!ipc.opt)
591 ipc.opt = inet->opt;
592
593 saddr = ipc.addr;
594 ipc.addr = faddr = daddr;
595
596 if (ipc.opt && ipc.opt->srr) {
597 if (!daddr)
598 return -EINVAL;
599 faddr = ipc.opt->faddr;
600 connected = 0;
601 }
602 tos = RT_TOS(inet->tos);
603 if (sock_flag(sk, SOCK_LOCALROUTE) ||
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900604 (msg->msg_flags & MSG_DONTROUTE) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 (ipc.opt && ipc.opt->is_strictroute)) {
606 tos |= RTO_ONLINK;
607 connected = 0;
608 }
609
610 if (MULTICAST(daddr)) {
611 if (!ipc.oif)
612 ipc.oif = inet->mc_index;
613 if (!saddr)
614 saddr = inet->mc_addr;
615 connected = 0;
616 }
617
618 if (connected)
619 rt = (struct rtable*)sk_dst_check(sk, 0);
620
621 if (rt == NULL) {
622 struct flowi fl = { .oif = ipc.oif,
623 .nl_u = { .ip4_u =
624 { .daddr = faddr,
625 .saddr = saddr,
626 .tos = tos } },
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800627 .proto = sk->sk_protocol,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 .uli_u = { .ports =
629 { .sport = inet->sport,
630 .dport = dport } } };
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700631 security_sk_classify_flow(sk, &fl);
David S. Miller8eb90862007-02-08 02:09:21 -0800632 err = ip_route_output_flow(&rt, &fl, sk, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (err)
634 goto out;
635
636 err = -EACCES;
637 if ((rt->rt_flags & RTCF_BROADCAST) &&
638 !sock_flag(sk, SOCK_BROADCAST))
639 goto out;
640 if (connected)
641 sk_dst_set(sk, dst_clone(&rt->u.dst));
642 }
643
644 if (msg->msg_flags&MSG_CONFIRM)
645 goto do_confirm;
646back_from_confirm:
647
648 saddr = rt->rt_src;
649 if (!ipc.addr)
650 daddr = ipc.addr = rt->rt_dst;
651
652 lock_sock(sk);
653 if (unlikely(up->pending)) {
654 /* The socket is already corked while preparing it. */
655 /* ... which is an evident application bug. --ANK */
656 release_sock(sk);
657
Patrick McHardy64ce2072005-08-09 20:50:53 -0700658 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700659 err = -EINVAL;
660 goto out;
661 }
662 /*
663 * Now cork the socket to pend data.
664 */
665 inet->cork.fl.fl4_dst = daddr;
666 inet->cork.fl.fl_ip_dport = dport;
667 inet->cork.fl.fl4_src = saddr;
668 inet->cork.fl.fl_ip_sport = inet->sport;
669 up->pending = AF_INET;
670
671do_append_data:
672 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800673 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
674 err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
675 sizeof(struct udphdr), &ipc, rt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
677 if (err)
678 udp_flush_pending_frames(sk);
679 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800680 err = udp_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -0700681 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
682 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683 release_sock(sk);
684
685out:
686 ip_rt_put(rt);
687 if (free)
688 kfree(ipc.opt);
689 if (!err) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800690 UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691 return len;
692 }
Martin Bligh81aa6462006-08-14 23:57:10 -0700693 /*
694 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
695 * ENOBUFS might not be good (it's not tunable per se), but otherwise
696 * we don't have a good statistic (IpOutDiscards but it can be too many
697 * things). We could add another new stat but at least for now that
698 * seems like overkill.
699 */
700 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800701 UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
Martin Bligh81aa6462006-08-14 23:57:10 -0700702 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 return err;
704
705do_confirm:
706 dst_confirm(&rt->u.dst);
707 if (!(msg->msg_flags&MSG_PROBE) || len)
708 goto back_from_confirm;
709 err = 0;
710 goto out;
711}
712
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800713int udp_sendpage(struct sock *sk, struct page *page, int offset,
714 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700715{
716 struct udp_sock *up = udp_sk(sk);
717 int ret;
718
719 if (!up->pending) {
720 struct msghdr msg = { .msg_flags = flags|MSG_MORE };
721
722 /* Call udp_sendmsg to specify destination address which
723 * sendpage interface can't pass.
724 * This will succeed only when the socket is connected.
725 */
726 ret = udp_sendmsg(NULL, sk, &msg, 0);
727 if (ret < 0)
728 return ret;
729 }
730
731 lock_sock(sk);
732
733 if (unlikely(!up->pending)) {
734 release_sock(sk);
735
Patrick McHardy64ce2072005-08-09 20:50:53 -0700736 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 return -EINVAL;
738 }
739
740 ret = ip_append_page(sk, page, offset, size, flags);
741 if (ret == -EOPNOTSUPP) {
742 release_sock(sk);
743 return sock_no_sendpage(sk->sk_socket, page, offset,
744 size, flags);
745 }
746 if (ret < 0) {
747 udp_flush_pending_frames(sk);
748 goto out;
749 }
750
751 up->len += size;
752 if (!(up->corkflag || (flags&MSG_MORE)))
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800753 ret = udp_push_pending_frames(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754 if (!ret)
755 ret = size;
756out:
757 release_sock(sk);
758 return ret;
759}
760
761/*
762 * IOCTL requests applicable to the UDP protocol
763 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900764
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
766{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900767 switch(cmd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 {
769 case SIOCOUTQ:
770 {
771 int amount = atomic_read(&sk->sk_wmem_alloc);
772 return put_user(amount, (int __user *)arg);
773 }
774
775 case SIOCINQ:
776 {
777 struct sk_buff *skb;
778 unsigned long amount;
779
780 amount = 0;
Herbert Xu208d8982005-05-30 15:50:15 -0700781 spin_lock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 skb = skb_peek(&sk->sk_receive_queue);
783 if (skb != NULL) {
784 /*
785 * We will only return the amount
786 * of this packet since that is all
787 * that will be read.
788 */
789 amount = skb->len - sizeof(struct udphdr);
790 }
Herbert Xu208d8982005-05-30 15:50:15 -0700791 spin_unlock_bh(&sk->sk_receive_queue.lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 return put_user(amount, (int __user *)arg);
793 }
794
795 default:
796 return -ENOIOCTLCMD;
797 }
798 return(0);
799}
800
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801/*
802 * This should be easy, if there is something there we
803 * return it, otherwise we block.
804 */
805
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800806int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900807 size_t len, int noblock, int flags, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808{
809 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900810 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
811 struct sk_buff *skb;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800812 int copied, err, copy_only, is_udplite = IS_UDPLITE(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700813
814 /*
815 * Check any passed addresses
816 */
817 if (addr_len)
818 *addr_len=sizeof(*sin);
819
820 if (flags & MSG_ERRQUEUE)
821 return ip_recv_error(sk, msg, len);
822
823try_again:
824 skb = skb_recv_datagram(sk, flags, noblock, &err);
825 if (!skb)
826 goto out;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900827
828 copied = skb->len - sizeof(struct udphdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 if (copied > len) {
830 copied = len;
831 msg->msg_flags |= MSG_TRUNC;
832 }
833
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800834 /*
835 * Decide whether to checksum and/or copy data.
836 *
837 * UDP: checksum may have been computed in HW,
838 * (re-)compute it if message is truncated.
839 * UDP-Lite: always needs to checksum, no HW support.
840 */
841 copy_only = (skb->ip_summed==CHECKSUM_UNNECESSARY);
842
843 if (is_udplite || (!copy_only && msg->msg_flags&MSG_TRUNC)) {
844 if (__udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800846 copy_only = 1;
847 }
848
849 if (copy_only)
850 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
851 msg->msg_iov, copied );
852 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
854
855 if (err == -EINVAL)
856 goto csum_copy_err;
857 }
858
859 if (err)
860 goto out_free;
861
862 sock_recv_timestamp(msg, sk, skb);
863
864 /* Copy the address. */
865 if (sin)
866 {
867 sin->sin_family = AF_INET;
868 sin->sin_port = skb->h.uh->source;
869 sin->sin_addr.s_addr = skb->nh.iph->saddr;
870 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900871 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 if (inet->cmsg_flags)
873 ip_cmsg_recv(msg, skb);
874
875 err = copied;
876 if (flags & MSG_TRUNC)
877 err = skb->len - sizeof(struct udphdr);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900878
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879out_free:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900880 skb_free_datagram(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881out:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900882 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
884csum_copy_err:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800885 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886
Herbert Xu3305b802005-12-13 23:16:37 -0800887 skb_kill_datagram(sk, skb, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
889 if (noblock)
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900890 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 goto try_again;
892}
893
894
895int udp_disconnect(struct sock *sk, int flags)
896{
897 struct inet_sock *inet = inet_sk(sk);
898 /*
899 * 1003.1g - break association.
900 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900901
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 sk->sk_state = TCP_CLOSE;
903 inet->daddr = 0;
904 inet->dport = 0;
905 sk->sk_bound_dev_if = 0;
906 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
907 inet_reset_saddr(sk);
908
909 if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
910 sk->sk_prot->unhash(sk);
911 inet->sport = 0;
912 }
913 sk_dst_reset(sk);
914 return 0;
915}
916
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917/* return:
918 * 1 if the the UDP system should process it
919 * 0 if we should drop this packet
920 * -1 if it should get processed by xfrm4_rcv_encap
921 */
922static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb)
923{
924#ifndef CONFIG_XFRM
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900925 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926#else
927 struct udp_sock *up = udp_sk(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900928 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929 struct iphdr *iph;
930 int iphlen, len;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900931
Olaf Kirch753eab72006-11-22 20:11:42 -0800932 __u8 *udpdata;
933 __be32 *udpdata32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934 __u16 encap_type = up->encap_type;
935
936 /* if we're overly short, let UDP handle it */
Olaf Kirch753eab72006-11-22 20:11:42 -0800937 len = skb->len - sizeof(struct udphdr);
938 if (len <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939 return 1;
940
941 /* if this is not encapsulated socket, then just return now */
942 if (!encap_type)
943 return 1;
944
Olaf Kirch753eab72006-11-22 20:11:42 -0800945 /* If this is a paged skb, make sure we pull up
946 * whatever data we need to look at. */
947 if (!pskb_may_pull(skb, sizeof(struct udphdr) + min(len, 8)))
948 return 1;
949
950 /* Now we can get the pointers */
951 uh = skb->h.uh;
952 udpdata = (__u8 *)uh + sizeof(struct udphdr);
953 udpdata32 = (__be32 *)udpdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
955 switch (encap_type) {
956 default:
957 case UDP_ENCAP_ESPINUDP:
958 /* Check if this is a keepalive packet. If so, eat it. */
959 if (len == 1 && udpdata[0] == 0xff) {
960 return 0;
961 } else if (len > sizeof(struct ip_esp_hdr) && udpdata32[0] != 0 ) {
962 /* ESP Packet without Non-ESP header */
963 len = sizeof(struct udphdr);
964 } else
965 /* Must be an IKE packet.. pass it through */
966 return 1;
967 break;
968 case UDP_ENCAP_ESPINUDP_NON_IKE:
969 /* Check if this is a keepalive packet. If so, eat it. */
970 if (len == 1 && udpdata[0] == 0xff) {
971 return 0;
972 } else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) &&
973 udpdata32[0] == 0 && udpdata32[1] == 0) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900974
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 /* ESP Packet with Non-IKE marker */
976 len = sizeof(struct udphdr) + 2 * sizeof(u32);
977 } else
978 /* Must be an IKE packet.. pass it through */
979 return 1;
980 break;
981 }
982
983 /* At this point we are sure that this is an ESPinUDP packet,
984 * so we need to remove 'len' bytes from the packet (the UDP
985 * header and optional ESP marker bytes) and then modify the
986 * protocol to ESP, and then call into the transform receiver.
987 */
Herbert Xu4d78b6c2005-04-19 22:48:59 -0700988 if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
989 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990
991 /* Now we can update and verify the packet length... */
992 iph = skb->nh.iph;
993 iphlen = iph->ihl << 2;
994 iph->tot_len = htons(ntohs(iph->tot_len) - len);
995 if (skb->len < iphlen + len) {
996 /* packet is too small!?! */
997 return 0;
998 }
999
1000 /* pull the data buffer up to the ESP header and set the
1001 * transport header to point to ESP. Keep UDP on the stack
1002 * for later.
1003 */
1004 skb->h.raw = skb_pull(skb, len);
1005
1006 /* modify the protocol (it's ESP!) */
1007 iph->protocol = IPPROTO_ESP;
1008
1009 /* and let the caller know to send this into the ESP processor... */
1010 return -1;
1011#endif
1012}
1013
1014/* returns:
1015 * -1: error
1016 * 0: success
1017 * >0: "udp encap" protocol resubmission
1018 *
1019 * Note that in the success and error cases, the skb is assumed to
1020 * have either been requeued or freed.
1021 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001022int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023{
1024 struct udp_sock *up = udp_sk(sk);
Martin Bligh81aa6462006-08-14 23:57:10 -07001025 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026
1027 /*
1028 * Charge it to the socket, dropping if the queue is full.
1029 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001030 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
1031 goto drop;
Patrick McHardyb59c2702006-01-06 23:06:10 -08001032 nf_reset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033
1034 if (up->encap_type) {
1035 /*
1036 * This is an encapsulation socket, so let's see if this is
1037 * an encapsulated packet.
1038 * If it's a keepalive packet, then just eat it.
1039 * If it's an encapsulateed packet, then pass it to the
1040 * IPsec xfrm input and return the response
1041 * appropriately. Otherwise, just fall through and
1042 * pass this up the UDP socket.
1043 */
1044 int ret;
1045
1046 ret = udp_encap_rcv(sk, skb);
1047 if (ret == 0) {
1048 /* Eat the packet .. */
1049 kfree_skb(skb);
1050 return 0;
1051 }
1052 if (ret < 0) {
1053 /* process the ESP packet */
1054 ret = xfrm4_rcv_encap(skb, up->encap_type);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001055 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 return -ret;
1057 }
1058 /* FALLTHROUGH -- it's a UDP Packet */
1059 }
1060
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001061 /*
1062 * UDP-Lite specific tests, ignored on UDP sockets
1063 */
1064 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
1065
1066 /*
1067 * MIB statistics other than incrementing the error count are
1068 * disabled for the following two types of errors: these depend
1069 * on the application settings, not on the functioning of the
1070 * protocol stack as such.
1071 *
1072 * RFC 3828 here recommends (sec 3.3): "There should also be a
1073 * way ... to ... at least let the receiving application block
1074 * delivery of packets with coverage values less than a value
1075 * provided by the application."
1076 */
1077 if (up->pcrlen == 0) { /* full coverage was set */
1078 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
1079 "%d while full coverage %d requested\n",
1080 UDP_SKB_CB(skb)->cscov, skb->len);
1081 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001083 /* The next case involves violating the min. coverage requested
1084 * by the receiver. This is subtle: if receiver wants x and x is
1085 * greater than the buffersize/MTU then receiver will complain
1086 * that it wants x while sender emits packets of smaller size y.
1087 * Therefore the above ...()->partial_cov statement is essential.
1088 */
1089 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
1090 LIMIT_NETDEBUG(KERN_WARNING
1091 "UDPLITE: coverage %d too small, need min %d\n",
1092 UDP_SKB_CB(skb)->cscov, up->pcrlen);
1093 goto drop;
1094 }
1095 }
1096
1097 if (sk->sk_filter && skb->ip_summed != CHECKSUM_UNNECESSARY) {
1098 if (__udp_lib_checksum_complete(skb))
1099 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001100 skb->ip_summed = CHECKSUM_UNNECESSARY;
1101 }
1102
Martin Bligh81aa6462006-08-14 23:57:10 -07001103 if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
1104 /* Note that an ENOMEM error is charged twice */
1105 if (rc == -ENOMEM)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001106 UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag);
1107 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001109
1110 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 return 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001112
1113drop:
1114 UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
1115 kfree_skb(skb);
1116 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001117}
1118
1119/*
1120 * Multicasts and broadcasts go to each listener.
1121 *
1122 * Note: called only from the BH handler context,
1123 * so we don't need to lock the hashes.
1124 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001125static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
1126 struct udphdr *uh,
1127 __be32 saddr, __be32 daddr,
1128 struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129{
1130 struct sock *sk;
1131 int dif;
1132
1133 read_lock(&udp_hash_lock);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001134 sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 dif = skb->dev->ifindex;
1136 sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
1137 if (sk) {
1138 struct sock *sknext = NULL;
1139
1140 do {
1141 struct sk_buff *skb1 = skb;
1142
1143 sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
1144 uh->source, saddr, dif);
1145 if(sknext)
1146 skb1 = skb_clone(skb, GFP_ATOMIC);
1147
1148 if(skb1) {
1149 int ret = udp_queue_rcv_skb(sk, skb1);
1150 if (ret > 0)
1151 /* we should probably re-process instead
1152 * of dropping packets here. */
1153 kfree_skb(skb1);
1154 }
1155 sk = sknext;
1156 } while(sknext);
1157 } else
1158 kfree_skb(skb);
1159 read_unlock(&udp_hash_lock);
1160 return 0;
1161}
1162
1163/* Initialize UDP checksum. If exited with zero value (success),
1164 * CHECKSUM_UNNECESSARY means, that no more checks are required.
1165 * Otherwise, csum completion requires chacksumming packet body,
1166 * including udp header and folding it to skb->csum.
1167 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001168static inline void udp4_csum_init(struct sk_buff *skb, struct udphdr *uh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169{
1170 if (uh->check == 0) {
1171 skb->ip_summed = CHECKSUM_UNNECESSARY;
Patrick McHardy84fa7932006-08-29 16:44:56 -07001172 } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001173 if (!csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
1174 skb->len, IPPROTO_UDP, skb->csum ))
Herbert Xufb286bb2005-11-10 13:01:24 -08001175 skb->ip_summed = CHECKSUM_UNNECESSARY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 }
1177 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001178 skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr,
1179 skb->nh.iph->daddr,
1180 skb->len, IPPROTO_UDP, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 /* Probably, we should checksum udp header (it should be in cache
1182 * in any case) and data in tiny packets (< rx copybreak).
1183 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001184
1185 /* UDP = UDP-Lite with a non-partial checksum coverage */
1186 UDP_SKB_CB(skb)->partial_cov = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187}
1188
1189/*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001190 * All we need to do is get the socket, and then do a checksum.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001191 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001192
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001193int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
1194 int is_udplite)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001196 struct sock *sk;
1197 struct udphdr *uh = skb->h.uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 unsigned short ulen;
1199 struct rtable *rt = (struct rtable*)skb->dst;
Al Viro734ab872006-09-27 18:37:41 -07001200 __be32 saddr = skb->nh.iph->saddr;
1201 __be32 daddr = skb->nh.iph->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202
1203 /*
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001204 * Validate the packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205 */
1206 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001207 goto drop; /* No space for header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208
1209 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001210 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001211 goto short_packet;
1212
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001213 if(! is_udplite ) { /* UDP validates ulen. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001215 if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
1216 goto short_packet;
1217
1218 udp4_csum_init(skb, uh);
1219
1220 } else { /* UDP-Lite validates cscov. */
1221 if (udplite4_csum_init(skb, uh))
1222 goto csum_error;
1223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001224
1225 if(rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001226 return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001227
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001228 sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
1229 skb->dev->ifindex, udptable );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
1231 if (sk != NULL) {
1232 int ret = udp_queue_rcv_skb(sk, skb);
1233 sock_put(sk);
1234
1235 /* a return value > 0 means to resubmit the input, but
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001236 * it wants the return to be -protocol, or 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07001237 */
1238 if (ret > 0)
1239 return -ret;
1240 return 0;
1241 }
1242
1243 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
1244 goto drop;
Patrick McHardyb59c2702006-01-06 23:06:10 -08001245 nf_reset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246
1247 /* No socket. Drop packet silently, if checksum is wrong */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001248 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 goto csum_error;
1250
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001251 UDP_INC_STATS_BH(UDP_MIB_NOPORTS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
1253
1254 /*
1255 * Hmm. We got an UDP packet to a port to which we
1256 * don't wanna listen. Ignore it.
1257 */
1258 kfree_skb(skb);
1259 return(0);
1260
1261short_packet:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001262 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
1263 is_udplite? "-Lite" : "",
Patrick McHardy64ce2072005-08-09 20:50:53 -07001264 NIPQUAD(saddr),
1265 ntohs(uh->source),
1266 ulen,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001267 skb->len,
Patrick McHardy64ce2072005-08-09 20:50:53 -07001268 NIPQUAD(daddr),
1269 ntohs(uh->dest));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001270 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271
1272csum_error:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001273 /*
1274 * RFC1122: OK. Discards the bad packet silently (as far as
1275 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001277 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
1278 is_udplite? "-Lite" : "",
Patrick McHardy64ce2072005-08-09 20:50:53 -07001279 NIPQUAD(saddr),
1280 ntohs(uh->source),
1281 NIPQUAD(daddr),
1282 ntohs(uh->dest),
1283 ulen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001284drop:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001285 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001286 kfree_skb(skb);
1287 return(0);
1288}
1289
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001290__inline__ int udp_rcv(struct sk_buff *skb)
1291{
1292 return __udp4_lib_rcv(skb, udp_hash, 0);
1293}
1294
1295int udp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296{
1297 lock_sock(sk);
1298 udp_flush_pending_frames(sk);
1299 release_sock(sk);
1300 return 0;
1301}
1302
1303/*
1304 * Socket option code for UDP
1305 */
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001306int udp_lib_setsockopt(struct sock *sk, int level, int optname,
1307 char __user *optval, int optlen,
1308 int (*push_pending_frames)(struct sock *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309{
1310 struct udp_sock *up = udp_sk(sk);
1311 int val;
1312 int err = 0;
1313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 if(optlen<sizeof(int))
1315 return -EINVAL;
1316
1317 if (get_user(val, (int __user *)optval))
1318 return -EFAULT;
1319
1320 switch(optname) {
1321 case UDP_CORK:
1322 if (val != 0) {
1323 up->corkflag = 1;
1324 } else {
1325 up->corkflag = 0;
1326 lock_sock(sk);
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001327 (*push_pending_frames)(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001328 release_sock(sk);
1329 }
1330 break;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001331
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332 case UDP_ENCAP:
1333 switch (val) {
1334 case 0:
1335 case UDP_ENCAP_ESPINUDP:
1336 case UDP_ENCAP_ESPINUDP_NON_IKE:
1337 up->encap_type = val;
1338 break;
1339 default:
1340 err = -ENOPROTOOPT;
1341 break;
1342 }
1343 break;
1344
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001345 /*
1346 * UDP-Lite's partial checksum coverage (RFC 3828).
1347 */
1348 /* The sender sets actual checksum coverage length via this option.
1349 * The case coverage > packet length is handled by send module. */
1350 case UDPLITE_SEND_CSCOV:
1351 if (!up->pcflag) /* Disable the option on UDP sockets */
1352 return -ENOPROTOOPT;
1353 if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
1354 val = 8;
1355 up->pcslen = val;
1356 up->pcflag |= UDPLITE_SEND_CC;
1357 break;
1358
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001359 /* The receiver specifies a minimum checksum coverage value. To make
1360 * sense, this should be set to at least 8 (as done below). If zero is
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001361 * used, this again means full checksum coverage. */
1362 case UDPLITE_RECV_CSCOV:
1363 if (!up->pcflag) /* Disable the option on UDP sockets */
1364 return -ENOPROTOOPT;
1365 if (val != 0 && val < 8) /* Avoid silly minimal values. */
1366 val = 8;
1367 up->pcrlen = val;
1368 up->pcflag |= UDPLITE_RECV_CC;
1369 break;
1370
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 default:
1372 err = -ENOPROTOOPT;
1373 break;
1374 };
1375
1376 return err;
1377}
1378
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001379int udp_setsockopt(struct sock *sk, int level, int optname,
1380 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001381{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001382 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001383 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1384 udp_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001385 return ip_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001386}
1387
1388#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001389int compat_udp_setsockopt(struct sock *sk, int level, int optname,
1390 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001391{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001392 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001393 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1394 udp_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001395 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001396}
1397#endif
1398
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001399int udp_lib_getsockopt(struct sock *sk, int level, int optname,
1400 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401{
1402 struct udp_sock *up = udp_sk(sk);
1403 int val, len;
1404
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 if(get_user(len,optlen))
1406 return -EFAULT;
1407
1408 len = min_t(unsigned int, len, sizeof(int));
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001409
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410 if(len < 0)
1411 return -EINVAL;
1412
1413 switch(optname) {
1414 case UDP_CORK:
1415 val = up->corkflag;
1416 break;
1417
1418 case UDP_ENCAP:
1419 val = up->encap_type;
1420 break;
1421
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001422 /* The following two cannot be changed on UDP sockets, the return is
1423 * always 0 (which corresponds to the full checksum coverage of UDP). */
1424 case UDPLITE_SEND_CSCOV:
1425 val = up->pcslen;
1426 break;
1427
1428 case UDPLITE_RECV_CSCOV:
1429 val = up->pcrlen;
1430 break;
1431
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432 default:
1433 return -ENOPROTOOPT;
1434 };
1435
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001436 if(put_user(len, optlen))
1437 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001438 if(copy_to_user(optval, &val,len))
1439 return -EFAULT;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001440 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441}
1442
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001443int udp_getsockopt(struct sock *sk, int level, int optname,
1444 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001445{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001446 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001447 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001448 return ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001449}
1450
1451#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001452int compat_udp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001453 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001454{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001455 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001456 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001457 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001458}
1459#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460/**
1461 * udp_poll - wait for a UDP event.
1462 * @file - file struct
1463 * @sock - socket
1464 * @wait - poll table
1465 *
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001466 * This is same as datagram poll, except for the special case of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 * blocking sockets. If application is using a blocking fd
1468 * and a packet with checksum error is in the queue;
1469 * then it could get return from select indicating data available
1470 * but then block when reading it. Add special case code
1471 * to work around these arguably broken applications.
1472 */
1473unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
1474{
1475 unsigned int mask = datagram_poll(file, sock, wait);
1476 struct sock *sk = sock->sk;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001477 int is_lite = IS_UDPLITE(sk);
1478
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 /* Check for false positives due to checksum errors */
1480 if ( (mask & POLLRDNORM) &&
1481 !(file->f_flags & O_NONBLOCK) &&
1482 !(sk->sk_shutdown & RCV_SHUTDOWN)){
1483 struct sk_buff_head *rcvq = &sk->sk_receive_queue;
1484 struct sk_buff *skb;
1485
Herbert Xu208d8982005-05-30 15:50:15 -07001486 spin_lock_bh(&rcvq->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 while ((skb = skb_peek(rcvq)) != NULL) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001488 if (udp_lib_checksum_complete(skb)) {
1489 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_lite);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001490 __skb_unlink(skb, rcvq);
1491 kfree_skb(skb);
1492 } else {
1493 skb->ip_summed = CHECKSUM_UNNECESSARY;
1494 break;
1495 }
1496 }
Herbert Xu208d8982005-05-30 15:50:15 -07001497 spin_unlock_bh(&rcvq->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498
1499 /* nothing to see, move along */
1500 if (skb == NULL)
1501 mask &= ~(POLLIN | POLLRDNORM);
1502 }
1503
1504 return mask;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001505
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506}
1507
1508struct proto udp_prot = {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001509 .name = "UDP",
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001510 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001511 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001512 .connect = ip4_datagram_connect,
1513 .disconnect = udp_disconnect,
1514 .ioctl = udp_ioctl,
1515 .destroy = udp_destroy_sock,
1516 .setsockopt = udp_setsockopt,
1517 .getsockopt = udp_getsockopt,
1518 .sendmsg = udp_sendmsg,
1519 .recvmsg = udp_recvmsg,
1520 .sendpage = udp_sendpage,
1521 .backlog_rcv = udp_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001522 .hash = udp_lib_hash,
1523 .unhash = udp_lib_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001524 .get_port = udp_v4_get_port,
1525 .obj_size = sizeof(struct udp_sock),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001526#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001527 .compat_setsockopt = compat_udp_setsockopt,
1528 .compat_getsockopt = compat_udp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001529#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530};
1531
1532/* ------------------------------------------------------------------------ */
1533#ifdef CONFIG_PROC_FS
1534
1535static struct sock *udp_get_first(struct seq_file *seq)
1536{
1537 struct sock *sk;
1538 struct udp_iter_state *state = seq->private;
1539
1540 for (state->bucket = 0; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) {
1541 struct hlist_node *node;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001542 sk_for_each(sk, node, state->hashtable + state->bucket) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543 if (sk->sk_family == state->family)
1544 goto found;
1545 }
1546 }
1547 sk = NULL;
1548found:
1549 return sk;
1550}
1551
1552static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
1553{
1554 struct udp_iter_state *state = seq->private;
1555
1556 do {
1557 sk = sk_next(sk);
1558try_again:
1559 ;
1560 } while (sk && sk->sk_family != state->family);
1561
1562 if (!sk && ++state->bucket < UDP_HTABLE_SIZE) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001563 sk = sk_head(state->hashtable + state->bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001564 goto try_again;
1565 }
1566 return sk;
1567}
1568
1569static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos)
1570{
1571 struct sock *sk = udp_get_first(seq);
1572
1573 if (sk)
1574 while(pos && (sk = udp_get_next(seq, sk)) != NULL)
1575 --pos;
1576 return pos ? NULL : sk;
1577}
1578
1579static void *udp_seq_start(struct seq_file *seq, loff_t *pos)
1580{
1581 read_lock(&udp_hash_lock);
1582 return *pos ? udp_get_idx(seq, *pos-1) : (void *)1;
1583}
1584
1585static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1586{
1587 struct sock *sk;
1588
1589 if (v == (void *)1)
1590 sk = udp_get_idx(seq, 0);
1591 else
1592 sk = udp_get_next(seq, v);
1593
1594 ++*pos;
1595 return sk;
1596}
1597
1598static void udp_seq_stop(struct seq_file *seq, void *v)
1599{
1600 read_unlock(&udp_hash_lock);
1601}
1602
1603static int udp_seq_open(struct inode *inode, struct file *file)
1604{
1605 struct udp_seq_afinfo *afinfo = PDE(inode)->data;
1606 struct seq_file *seq;
1607 int rc = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001608 struct udp_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001609
1610 if (!s)
1611 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001612 s->family = afinfo->family;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001613 s->hashtable = afinfo->hashtable;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614 s->seq_ops.start = udp_seq_start;
1615 s->seq_ops.next = udp_seq_next;
1616 s->seq_ops.show = afinfo->seq_show;
1617 s->seq_ops.stop = udp_seq_stop;
1618
1619 rc = seq_open(file, &s->seq_ops);
1620 if (rc)
1621 goto out_kfree;
1622
1623 seq = file->private_data;
1624 seq->private = s;
1625out:
1626 return rc;
1627out_kfree:
1628 kfree(s);
1629 goto out;
1630}
1631
1632/* ------------------------------------------------------------------------ */
1633int udp_proc_register(struct udp_seq_afinfo *afinfo)
1634{
1635 struct proc_dir_entry *p;
1636 int rc = 0;
1637
1638 if (!afinfo)
1639 return -EINVAL;
1640 afinfo->seq_fops->owner = afinfo->owner;
1641 afinfo->seq_fops->open = udp_seq_open;
1642 afinfo->seq_fops->read = seq_read;
1643 afinfo->seq_fops->llseek = seq_lseek;
1644 afinfo->seq_fops->release = seq_release_private;
1645
1646 p = proc_net_fops_create(afinfo->name, S_IRUGO, afinfo->seq_fops);
1647 if (p)
1648 p->data = afinfo;
1649 else
1650 rc = -ENOMEM;
1651 return rc;
1652}
1653
1654void udp_proc_unregister(struct udp_seq_afinfo *afinfo)
1655{
1656 if (!afinfo)
1657 return;
1658 proc_net_remove(afinfo->name);
1659 memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
1660}
1661
1662/* ------------------------------------------------------------------------ */
1663static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
1664{
1665 struct inet_sock *inet = inet_sk(sp);
Al Viro734ab872006-09-27 18:37:41 -07001666 __be32 dest = inet->daddr;
1667 __be32 src = inet->rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668 __u16 destp = ntohs(inet->dport);
1669 __u16 srcp = ntohs(inet->sport);
1670
1671 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
1672 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001673 bucket, src, srcp, dest, destp, sp->sk_state,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001674 atomic_read(&sp->sk_wmem_alloc),
1675 atomic_read(&sp->sk_rmem_alloc),
1676 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
1677 atomic_read(&sp->sk_refcnt), sp);
1678}
1679
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001680int udp4_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001681{
1682 if (v == SEQ_START_TOKEN)
1683 seq_printf(seq, "%-127s\n",
1684 " sl local_address rem_address st tx_queue "
1685 "rx_queue tr tm->when retrnsmt uid timeout "
1686 "inode");
1687 else {
1688 char tmpbuf[129];
1689 struct udp_iter_state *state = seq->private;
1690
1691 udp4_format_sock(v, tmpbuf, state->bucket);
1692 seq_printf(seq, "%-127s\n", tmpbuf);
1693 }
1694 return 0;
1695}
1696
1697/* ------------------------------------------------------------------------ */
1698static struct file_operations udp4_seq_fops;
1699static struct udp_seq_afinfo udp4_seq_afinfo = {
1700 .owner = THIS_MODULE,
1701 .name = "udp",
1702 .family = AF_INET,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001703 .hashtable = udp_hash,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001704 .seq_show = udp4_seq_show,
1705 .seq_fops = &udp4_seq_fops,
1706};
1707
1708int __init udp4_proc_init(void)
1709{
1710 return udp_proc_register(&udp4_seq_afinfo);
1711}
1712
1713void udp4_proc_exit(void)
1714{
1715 udp_proc_unregister(&udp4_seq_afinfo);
1716}
1717#endif /* CONFIG_PROC_FS */
1718
1719EXPORT_SYMBOL(udp_disconnect);
1720EXPORT_SYMBOL(udp_hash);
1721EXPORT_SYMBOL(udp_hash_lock);
1722EXPORT_SYMBOL(udp_ioctl);
Gerrit Renker25030a72006-08-26 20:06:05 -07001723EXPORT_SYMBOL(udp_get_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001724EXPORT_SYMBOL(udp_prot);
1725EXPORT_SYMBOL(udp_sendmsg);
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001726EXPORT_SYMBOL(udp_lib_getsockopt);
1727EXPORT_SYMBOL(udp_lib_setsockopt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001728EXPORT_SYMBOL(udp_poll);
1729
1730#ifdef CONFIG_PROC_FS
1731EXPORT_SYMBOL(udp_proc_register);
1732EXPORT_SYMBOL(udp_proc_unregister);
1733#endif