blob: 1bbf5510cf3a9185cbb2d64a05b8e9cf4e49d1ba [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)])
Eric Dumazet95f30b32007-02-09 15:44:52 -0800123 if (sk->sk_hash == num)
Gerrit Renker25030a72006-08-26 20:06:05 -0700124 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;
Stephen Hemminger6516c652007-03-08 20:41:55 -0800178 for (i = 0; i < (1 << 16) / UDP_HTABLE_SIZE;
179 i++, result += UDP_HTABLE_SIZE) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 if (result > sysctl_local_port_range[1])
181 result = sysctl_local_port_range[0]
182 + ((result - sysctl_local_port_range[0]) &
183 (UDP_HTABLE_SIZE - 1));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800184 if (! __udp_lib_lport_inuse(result, udptable))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 break;
186 }
187 if (i >= (1 << 16) / UDP_HTABLE_SIZE)
188 goto fail;
189gotit:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800190 *port_rover = snum = result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 } else {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800192 head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Gerrit Renker25030a72006-08-26 20:06:05 -0700194 sk_for_each(sk2, node, head)
Eric Dumazet95f30b32007-02-09 15:44:52 -0800195 if (sk2->sk_hash == snum &&
Gerrit Renker25030a72006-08-26 20:06:05 -0700196 sk2 != sk &&
197 (!sk2->sk_reuse || !sk->sk_reuse) &&
198 (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
199 || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800200 (*saddr_comp)(sk, sk2) )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 }
Gerrit Renker25030a72006-08-26 20:06:05 -0700203 inet_sk(sk)->num = snum;
Eric Dumazet95f30b32007-02-09 15:44:52 -0800204 sk->sk_hash = snum;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (sk_unhashed(sk)) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800206 head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
Gerrit Renker25030a72006-08-26 20:06:05 -0700207 sk_add_node(sk, head);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 sock_prot_inc_use(sk->sk_prot);
209 }
Gerrit Renker25030a72006-08-26 20:06:05 -0700210 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211fail:
212 write_unlock_bh(&udp_hash_lock);
Gerrit Renker25030a72006-08-26 20:06:05 -0700213 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214}
215
Stephen Hemminger3fbe0702007-03-08 20:46:41 -0800216int udp_get_port(struct sock *sk, unsigned short snum,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800217 int (*scmp)(const struct sock *, const struct sock *))
218{
219 return __udp_lib_get_port(sk, snum, udp_hash, &udp_port_rover, scmp);
220}
221
Stephen Hemminger3fbe0702007-03-08 20:46:41 -0800222int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
Gerrit Renker25030a72006-08-26 20:06:05 -0700223{
224 struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
225
226 return ( !ipv6_only_sock(sk2) &&
227 (!inet1->rcv_saddr || !inet2->rcv_saddr ||
228 inet1->rcv_saddr == inet2->rcv_saddr ));
229}
230
231static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
232{
233 return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
234}
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
237 * harder than this. -DaveM
238 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800239static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport,
240 __be32 daddr, __be16 dport,
241 int dif, struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
243 struct sock *sk, *result = NULL;
244 struct hlist_node *node;
245 unsigned short hnum = ntohs(dport);
246 int badness = -1;
247
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800248 read_lock(&udp_hash_lock);
249 sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 struct inet_sock *inet = inet_sk(sk);
251
Eric Dumazet95f30b32007-02-09 15:44:52 -0800252 if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 int score = (sk->sk_family == PF_INET ? 1 : 0);
254 if (inet->rcv_saddr) {
255 if (inet->rcv_saddr != daddr)
256 continue;
257 score+=2;
258 }
259 if (inet->daddr) {
260 if (inet->daddr != saddr)
261 continue;
262 score+=2;
263 }
264 if (inet->dport) {
265 if (inet->dport != sport)
266 continue;
267 score+=2;
268 }
269 if (sk->sk_bound_dev_if) {
270 if (sk->sk_bound_dev_if != dif)
271 continue;
272 score+=2;
273 }
Stephen Hemminger6516c652007-03-08 20:41:55 -0800274 if (score == 9) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 result = sk;
276 break;
Stephen Hemminger6516c652007-03-08 20:41:55 -0800277 } else if (score > badness) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 result = sk;
279 badness = score;
280 }
281 }
282 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800283 if (result)
284 sock_hold(result);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 read_unlock(&udp_hash_lock);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800286 return result;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
289static inline struct sock *udp_v4_mcast_next(struct sock *sk,
Al Viro734ab872006-09-27 18:37:41 -0700290 __be16 loc_port, __be32 loc_addr,
291 __be16 rmt_port, __be32 rmt_addr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 int dif)
293{
294 struct hlist_node *node;
295 struct sock *s = sk;
296 unsigned short hnum = ntohs(loc_port);
297
298 sk_for_each_from(s, node) {
299 struct inet_sock *inet = inet_sk(s);
300
Eric Dumazet95f30b32007-02-09 15:44:52 -0800301 if (s->sk_hash != hnum ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 (inet->daddr && inet->daddr != rmt_addr) ||
303 (inet->dport != rmt_port && inet->dport) ||
304 (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
305 ipv6_only_sock(s) ||
306 (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
307 continue;
308 if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
309 continue;
310 goto found;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 s = NULL;
313found:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900314 return s;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315}
316
317/*
318 * This routine is called by the ICMP module when it gets some
319 * sort of error condition. If err < 0 then the socket should
320 * be closed and the error returned to the user. If err > 0
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900321 * it's just the icmp type << 8 | icmp code.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 * Header points to the ip header of the error packet. We move
323 * on past this. Then (as it used to claim before adjustment)
324 * header points to the first 8 bytes of the udp header. We need
325 * to find the appropriate port.
326 */
327
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800328void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329{
330 struct inet_sock *inet;
331 struct iphdr *iph = (struct iphdr*)skb->data;
332 struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
333 int type = skb->h.icmph->type;
334 int code = skb->h.icmph->code;
335 struct sock *sk;
336 int harderr;
337 int err;
338
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800339 sk = __udp4_lib_lookup(iph->daddr, uh->dest, iph->saddr, uh->source,
340 skb->dev->ifindex, udptable );
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 if (sk == NULL) {
342 ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900343 return; /* No socket for error */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 }
345
346 err = 0;
347 harderr = 0;
348 inet = inet_sk(sk);
349
350 switch (type) {
351 default:
352 case ICMP_TIME_EXCEEDED:
353 err = EHOSTUNREACH;
354 break;
355 case ICMP_SOURCE_QUENCH:
356 goto out;
357 case ICMP_PARAMETERPROB:
358 err = EPROTO;
359 harderr = 1;
360 break;
361 case ICMP_DEST_UNREACH:
362 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
363 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
364 err = EMSGSIZE;
365 harderr = 1;
366 break;
367 }
368 goto out;
369 }
370 err = EHOSTUNREACH;
371 if (code <= NR_ICMP_UNREACH) {
372 harderr = icmp_err_convert[code].fatal;
373 err = icmp_err_convert[code].errno;
374 }
375 break;
376 }
377
378 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900379 * RFC1122: OK. Passes ICMP errors back to application, as per
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 * 4.1.3.3.
381 */
382 if (!inet->recverr) {
383 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
384 goto out;
385 } else {
386 ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
387 }
388 sk->sk_err = err;
389 sk->sk_error_report(sk);
390out:
391 sock_put(sk);
392}
393
Stephen Hemminger3fbe0702007-03-08 20:46:41 -0800394void udp_err(struct sk_buff *skb, u32 info)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800395{
396 return __udp4_lib_err(skb, info, udp_hash);
397}
398
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399/*
400 * Throw away all pending data and cancel the corking. Socket is locked.
401 */
402static void udp_flush_pending_frames(struct sock *sk)
403{
404 struct udp_sock *up = udp_sk(sk);
405
406 if (up->pending) {
407 up->len = 0;
408 up->pending = 0;
409 ip_flush_pending_frames(sk);
410 }
411}
412
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800413/**
414 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
415 * @sk: socket we are sending on
416 * @skb: sk_buff containing the filled-in UDP header
417 * (checksum field must be zeroed out)
418 */
419static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
420 __be32 src, __be32 dst, int len )
421{
Al Viro6b116872006-11-14 21:28:24 -0800422 unsigned int offset;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800423 struct udphdr *uh = skb->h.uh;
Al Viro6b116872006-11-14 21:28:24 -0800424 __wsum csum = 0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800425
426 if (skb_queue_len(&sk->sk_write_queue) == 1) {
427 /*
428 * Only one fragment on the socket.
429 */
Al Viroff1dcad2006-11-20 18:07:29 -0800430 skb->csum_offset = offsetof(struct udphdr, check);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800431 uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
432 } else {
433 /*
434 * HW-checksum won't work as there are two or more
435 * fragments on the socket so that all csums of sk_buffs
436 * should be together
437 */
438 offset = skb->h.raw - skb->data;
439 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
440
441 skb->ip_summed = CHECKSUM_NONE;
442
443 skb_queue_walk(&sk->sk_write_queue, skb) {
444 csum = csum_add(csum, skb->csum);
445 }
446
447 uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
448 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800449 uh->check = CSUM_MANGLED_0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800450 }
451}
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453/*
454 * Push out all pending data as one UDP datagram. Socket is locked.
455 */
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800456static int udp_push_pending_frames(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457{
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800458 struct udp_sock *up = udp_sk(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 struct inet_sock *inet = inet_sk(sk);
460 struct flowi *fl = &inet->cork.fl;
461 struct sk_buff *skb;
462 struct udphdr *uh;
463 int err = 0;
Al Viro8e5200f2006-11-20 18:06:37 -0800464 __wsum csum = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465
466 /* Grab the skbuff where UDP header space exists. */
467 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
468 goto out;
469
470 /*
471 * Create a UDP header
472 */
473 uh = skb->h.uh;
474 uh->source = fl->fl_ip_sport;
475 uh->dest = fl->fl_ip_dport;
476 uh->len = htons(up->len);
477 uh->check = 0;
478
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800479 if (up->pcflag) /* UDP-Lite */
480 csum = udplite_csum_outgoing(sk, skb);
481
482 else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 skb->ip_summed = CHECKSUM_NONE;
485 goto send;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800487 } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800489 udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
490 goto send;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800492 } else /* `normal' UDP */
493 csum = udp_csum_outgoing(sk, skb);
494
495 /* add protocol-dependent pseudo-header */
496 uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
497 sk->sk_protocol, csum );
498 if (uh->check == 0)
Al Virof6ab0282006-11-16 02:36:50 -0800499 uh->check = CSUM_MANGLED_0;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501send:
502 err = ip_push_pending_frames(sk);
503out:
504 up->len = 0;
505 up->pending = 0;
506 return err;
507}
508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
510 size_t len)
511{
512 struct inet_sock *inet = inet_sk(sk);
513 struct udp_sock *up = udp_sk(sk);
514 int ulen = len;
515 struct ipcm_cookie ipc;
516 struct rtable *rt = NULL;
517 int free = 0;
518 int connected = 0;
Al Viro3ca3c682006-09-27 18:28:07 -0700519 __be32 daddr, faddr, saddr;
Al Viro734ab872006-09-27 18:37:41 -0700520 __be16 dport;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 u8 tos;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800522 int err, is_udplite = up->pcflag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800524 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 if (len > 0xFFFF)
527 return -EMSGSIZE;
528
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900529 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 * Check the flags.
531 */
532
533 if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
534 return -EOPNOTSUPP;
535
536 ipc.opt = NULL;
537
538 if (up->pending) {
539 /*
540 * There are pending frames.
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900541 * The socket lock must be held while it's corked.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 */
543 lock_sock(sk);
544 if (likely(up->pending)) {
545 if (unlikely(up->pending != AF_INET)) {
546 release_sock(sk);
547 return -EINVAL;
548 }
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900549 goto do_append_data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 }
551 release_sock(sk);
552 }
553 ulen += sizeof(struct udphdr);
554
555 /*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900556 * Get and verify the address.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 */
558 if (msg->msg_name) {
559 struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
560 if (msg->msg_namelen < sizeof(*usin))
561 return -EINVAL;
562 if (usin->sin_family != AF_INET) {
563 if (usin->sin_family != AF_UNSPEC)
564 return -EAFNOSUPPORT;
565 }
566
567 daddr = usin->sin_addr.s_addr;
568 dport = usin->sin_port;
569 if (dport == 0)
570 return -EINVAL;
571 } else {
572 if (sk->sk_state != TCP_ESTABLISHED)
573 return -EDESTADDRREQ;
574 daddr = inet->daddr;
575 dport = inet->dport;
576 /* Open fast path for connected socket.
577 Route will not be used, if at least one option is set.
578 */
579 connected = 1;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900580 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581 ipc.addr = inet->saddr;
582
583 ipc.oif = sk->sk_bound_dev_if;
584 if (msg->msg_controllen) {
585 err = ip_cmsg_send(msg, &ipc);
586 if (err)
587 return err;
588 if (ipc.opt)
589 free = 1;
590 connected = 0;
591 }
592 if (!ipc.opt)
593 ipc.opt = inet->opt;
594
595 saddr = ipc.addr;
596 ipc.addr = faddr = daddr;
597
598 if (ipc.opt && ipc.opt->srr) {
599 if (!daddr)
600 return -EINVAL;
601 faddr = ipc.opt->faddr;
602 connected = 0;
603 }
604 tos = RT_TOS(inet->tos);
605 if (sock_flag(sk, SOCK_LOCALROUTE) ||
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900606 (msg->msg_flags & MSG_DONTROUTE) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 (ipc.opt && ipc.opt->is_strictroute)) {
608 tos |= RTO_ONLINK;
609 connected = 0;
610 }
611
612 if (MULTICAST(daddr)) {
613 if (!ipc.oif)
614 ipc.oif = inet->mc_index;
615 if (!saddr)
616 saddr = inet->mc_addr;
617 connected = 0;
618 }
619
620 if (connected)
621 rt = (struct rtable*)sk_dst_check(sk, 0);
622
623 if (rt == NULL) {
624 struct flowi fl = { .oif = ipc.oif,
625 .nl_u = { .ip4_u =
626 { .daddr = faddr,
627 .saddr = saddr,
628 .tos = tos } },
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800629 .proto = sk->sk_protocol,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 .uli_u = { .ports =
631 { .sport = inet->sport,
632 .dport = dport } } };
Venkat Yekkiralabeb8d132006-08-04 23:12:42 -0700633 security_sk_classify_flow(sk, &fl);
David S. Miller8eb90862007-02-08 02:09:21 -0800634 err = ip_route_output_flow(&rt, &fl, sk, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 if (err)
636 goto out;
637
638 err = -EACCES;
639 if ((rt->rt_flags & RTCF_BROADCAST) &&
640 !sock_flag(sk, SOCK_BROADCAST))
641 goto out;
642 if (connected)
643 sk_dst_set(sk, dst_clone(&rt->u.dst));
644 }
645
646 if (msg->msg_flags&MSG_CONFIRM)
647 goto do_confirm;
648back_from_confirm:
649
650 saddr = rt->rt_src;
651 if (!ipc.addr)
652 daddr = ipc.addr = rt->rt_dst;
653
654 lock_sock(sk);
655 if (unlikely(up->pending)) {
656 /* The socket is already corked while preparing it. */
657 /* ... which is an evident application bug. --ANK */
658 release_sock(sk);
659
Patrick McHardy64ce2072005-08-09 20:50:53 -0700660 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 err = -EINVAL;
662 goto out;
663 }
664 /*
665 * Now cork the socket to pend data.
666 */
667 inet->cork.fl.fl4_dst = daddr;
668 inet->cork.fl.fl_ip_dport = dport;
669 inet->cork.fl.fl4_src = saddr;
670 inet->cork.fl.fl_ip_sport = inet->sport;
671 up->pending = AF_INET;
672
673do_append_data:
674 up->len += ulen;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800675 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
676 err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
677 sizeof(struct udphdr), &ipc, rt,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
679 if (err)
680 udp_flush_pending_frames(sk);
681 else if (!corkreq)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800682 err = udp_push_pending_frames(sk);
Herbert Xu1e0c14f2006-10-03 14:35:49 -0700683 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
684 up->pending = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700685 release_sock(sk);
686
687out:
688 ip_rt_put(rt);
689 if (free)
690 kfree(ipc.opt);
691 if (!err) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800692 UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 return len;
694 }
Martin Bligh81aa6462006-08-14 23:57:10 -0700695 /*
696 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
697 * ENOBUFS might not be good (it's not tunable per se), but otherwise
698 * we don't have a good statistic (IpOutDiscards but it can be too many
699 * things). We could add another new stat but at least for now that
700 * seems like overkill.
701 */
702 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800703 UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
Martin Bligh81aa6462006-08-14 23:57:10 -0700704 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 return err;
706
707do_confirm:
708 dst_confirm(&rt->u.dst);
709 if (!(msg->msg_flags&MSG_PROBE) || len)
710 goto back_from_confirm;
711 err = 0;
712 goto out;
713}
714
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800715int udp_sendpage(struct sock *sk, struct page *page, int offset,
716 size_t size, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717{
718 struct udp_sock *up = udp_sk(sk);
719 int ret;
720
721 if (!up->pending) {
722 struct msghdr msg = { .msg_flags = flags|MSG_MORE };
723
724 /* Call udp_sendmsg to specify destination address which
725 * sendpage interface can't pass.
726 * This will succeed only when the socket is connected.
727 */
728 ret = udp_sendmsg(NULL, sk, &msg, 0);
729 if (ret < 0)
730 return ret;
731 }
732
733 lock_sock(sk);
734
735 if (unlikely(!up->pending)) {
736 release_sock(sk);
737
Patrick McHardy64ce2072005-08-09 20:50:53 -0700738 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 return -EINVAL;
740 }
741
742 ret = ip_append_page(sk, page, offset, size, flags);
743 if (ret == -EOPNOTSUPP) {
744 release_sock(sk);
745 return sock_no_sendpage(sk->sk_socket, page, offset,
746 size, flags);
747 }
748 if (ret < 0) {
749 udp_flush_pending_frames(sk);
750 goto out;
751 }
752
753 up->len += size;
754 if (!(up->corkflag || (flags&MSG_MORE)))
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -0800755 ret = udp_push_pending_frames(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 if (!ret)
757 ret = size;
758out:
759 release_sock(sk);
760 return ret;
761}
762
763/*
764 * IOCTL requests applicable to the UDP protocol
765 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900766
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
768{
Stephen Hemminger6516c652007-03-08 20:41:55 -0800769 switch (cmd) {
770 case SIOCOUTQ:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 {
Stephen Hemminger6516c652007-03-08 20:41:55 -0800772 int amount = atomic_read(&sk->sk_wmem_alloc);
773 return put_user(amount, (int __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
Stephen Hemminger6516c652007-03-08 20:41:55 -0800775
776 case SIOCINQ:
777 {
778 struct sk_buff *skb;
779 unsigned long amount;
780
781 amount = 0;
782 spin_lock_bh(&sk->sk_receive_queue.lock);
783 skb = skb_peek(&sk->sk_receive_queue);
784 if (skb != NULL) {
785 /*
786 * We will only return the amount
787 * of this packet since that is all
788 * that will be read.
789 */
790 amount = skb->len - sizeof(struct udphdr);
791 }
792 spin_unlock_bh(&sk->sk_receive_queue.lock);
793 return put_user(amount, (int __user *)arg);
794 }
795
796 default:
797 return -ENOIOCTLCMD;
798 }
799
800 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801}
802
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803/*
804 * This should be easy, if there is something there we
805 * return it, otherwise we block.
806 */
807
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800808int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900809 size_t len, int noblock, int flags, int *addr_len)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810{
811 struct inet_sock *inet = inet_sk(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900812 struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
813 struct sk_buff *skb;
Herbert Xu759e5d02007-03-25 20:10:56 -0700814 unsigned int ulen, copied;
815 int err;
816 int is_udplite = IS_UDPLITE(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
818 /*
819 * Check any passed addresses
820 */
821 if (addr_len)
822 *addr_len=sizeof(*sin);
823
824 if (flags & MSG_ERRQUEUE)
825 return ip_recv_error(sk, msg, len);
826
827try_again:
828 skb = skb_recv_datagram(sk, flags, noblock, &err);
829 if (!skb)
830 goto out;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900831
Herbert Xu759e5d02007-03-25 20:10:56 -0700832 ulen = skb->len - sizeof(struct udphdr);
833 copied = len;
834 if (copied > ulen)
835 copied = ulen;
836 else if (copied < ulen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837 msg->msg_flags |= MSG_TRUNC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800839 /*
Herbert Xu759e5d02007-03-25 20:10:56 -0700840 * If checksum is needed at all, try to do it while copying the
841 * data. If the data is truncated, or if we only want a partial
842 * coverage checksum (UDP-Lite), do it before the copy.
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800843 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800844
Herbert Xu759e5d02007-03-25 20:10:56 -0700845 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
846 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847 goto csum_copy_err;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800848 }
849
Herbert Xu759e5d02007-03-25 20:10:56 -0700850 if (skb->ip_summed == CHECKSUM_UNNECESSARY)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800851 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
852 msg->msg_iov, copied );
853 else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
855
856 if (err == -EINVAL)
857 goto csum_copy_err;
858 }
859
860 if (err)
861 goto out_free;
862
863 sock_recv_timestamp(msg, sk, skb);
864
865 /* Copy the address. */
866 if (sin)
867 {
868 sin->sin_family = AF_INET;
869 sin->sin_port = skb->h.uh->source;
870 sin->sin_addr.s_addr = skb->nh.iph->saddr;
871 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900872 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 if (inet->cmsg_flags)
874 ip_cmsg_recv(msg, skb);
875
876 err = copied;
877 if (flags & MSG_TRUNC)
Herbert Xu759e5d02007-03-25 20:10:56 -0700878 err = ulen;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900879
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880out_free:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900881 skb_free_datagram(sk, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882out:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900883 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
885csum_copy_err:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800886 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887
Herbert Xu3305b802005-12-13 23:16:37 -0800888 skb_kill_datagram(sk, skb, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 if (noblock)
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900891 return -EAGAIN;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 goto try_again;
893}
894
895
896int udp_disconnect(struct sock *sk, int flags)
897{
898 struct inet_sock *inet = inet_sk(sk);
899 /*
900 * 1003.1g - break association.
901 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900902
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 sk->sk_state = TCP_CLOSE;
904 inet->daddr = 0;
905 inet->dport = 0;
906 sk->sk_bound_dev_if = 0;
907 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
908 inet_reset_saddr(sk);
909
910 if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
911 sk->sk_prot->unhash(sk);
912 inet->sport = 0;
913 }
914 sk_dst_reset(sk);
915 return 0;
916}
917
Linus Torvalds1da177e2005-04-16 15:20:36 -0700918/* return:
919 * 1 if the the UDP system should process it
920 * 0 if we should drop this packet
921 * -1 if it should get processed by xfrm4_rcv_encap
922 */
923static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb)
924{
925#ifndef CONFIG_XFRM
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900926 return 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927#else
928 struct udp_sock *up = udp_sk(sk);
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900929 struct udphdr *uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 struct iphdr *iph;
931 int iphlen, len;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900932
Olaf Kirch753eab72006-11-22 20:11:42 -0800933 __u8 *udpdata;
934 __be32 *udpdata32;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 __u16 encap_type = up->encap_type;
936
937 /* if we're overly short, let UDP handle it */
Olaf Kirch753eab72006-11-22 20:11:42 -0800938 len = skb->len - sizeof(struct udphdr);
939 if (len <= 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 return 1;
941
942 /* if this is not encapsulated socket, then just return now */
943 if (!encap_type)
944 return 1;
945
Olaf Kirch753eab72006-11-22 20:11:42 -0800946 /* If this is a paged skb, make sure we pull up
947 * whatever data we need to look at. */
948 if (!pskb_may_pull(skb, sizeof(struct udphdr) + min(len, 8)))
949 return 1;
950
951 /* Now we can get the pointers */
952 uh = skb->h.uh;
953 udpdata = (__u8 *)uh + sizeof(struct udphdr);
954 udpdata32 = (__be32 *)udpdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700955
956 switch (encap_type) {
957 default:
958 case UDP_ENCAP_ESPINUDP:
959 /* Check if this is a keepalive packet. If so, eat it. */
960 if (len == 1 && udpdata[0] == 0xff) {
961 return 0;
Stephen Hemminger6516c652007-03-08 20:41:55 -0800962 } else if (len > sizeof(struct ip_esp_hdr) && udpdata32[0] != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 /* ESP Packet without Non-ESP header */
964 len = sizeof(struct udphdr);
965 } else
966 /* Must be an IKE packet.. pass it through */
967 return 1;
968 break;
969 case UDP_ENCAP_ESPINUDP_NON_IKE:
970 /* Check if this is a keepalive packet. If so, eat it. */
971 if (len == 1 && udpdata[0] == 0xff) {
972 return 0;
973 } else if (len > 2 * sizeof(u32) + sizeof(struct ip_esp_hdr) &&
974 udpdata32[0] == 0 && udpdata32[1] == 0) {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +0900975
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 /* ESP Packet with Non-IKE marker */
977 len = sizeof(struct udphdr) + 2 * sizeof(u32);
978 } else
979 /* Must be an IKE packet.. pass it through */
980 return 1;
981 break;
982 }
983
984 /* At this point we are sure that this is an ESPinUDP packet,
985 * so we need to remove 'len' bytes from the packet (the UDP
986 * header and optional ESP marker bytes) and then modify the
987 * protocol to ESP, and then call into the transform receiver.
988 */
Herbert Xu4d78b6c2005-04-19 22:48:59 -0700989 if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
990 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
992 /* Now we can update and verify the packet length... */
993 iph = skb->nh.iph;
994 iphlen = iph->ihl << 2;
995 iph->tot_len = htons(ntohs(iph->tot_len) - len);
996 if (skb->len < iphlen + len) {
997 /* packet is too small!?! */
998 return 0;
999 }
1000
1001 /* pull the data buffer up to the ESP header and set the
1002 * transport header to point to ESP. Keep UDP on the stack
1003 * for later.
1004 */
Arnaldo Carvalho de Meloc7a3c5d2007-03-09 13:51:54 -08001005 skb->h.raw = __skb_pull(skb, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
1007 /* modify the protocol (it's ESP!) */
1008 iph->protocol = IPPROTO_ESP;
1009
1010 /* and let the caller know to send this into the ESP processor... */
1011 return -1;
1012#endif
1013}
1014
1015/* returns:
1016 * -1: error
1017 * 0: success
1018 * >0: "udp encap" protocol resubmission
1019 *
1020 * Note that in the success and error cases, the skb is assumed to
1021 * have either been requeued or freed.
1022 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001023int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024{
1025 struct udp_sock *up = udp_sk(sk);
Martin Bligh81aa6462006-08-14 23:57:10 -07001026 int rc;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027
1028 /*
1029 * Charge it to the socket, dropping if the queue is full.
1030 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001031 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
1032 goto drop;
Patrick McHardyb59c2702006-01-06 23:06:10 -08001033 nf_reset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034
1035 if (up->encap_type) {
1036 /*
1037 * This is an encapsulation socket, so let's see if this is
1038 * an encapsulated packet.
1039 * If it's a keepalive packet, then just eat it.
1040 * If it's an encapsulateed packet, then pass it to the
1041 * IPsec xfrm input and return the response
1042 * appropriately. Otherwise, just fall through and
1043 * pass this up the UDP socket.
1044 */
1045 int ret;
1046
1047 ret = udp_encap_rcv(sk, skb);
1048 if (ret == 0) {
1049 /* Eat the packet .. */
1050 kfree_skb(skb);
1051 return 0;
1052 }
1053 if (ret < 0) {
1054 /* process the ESP packet */
1055 ret = xfrm4_rcv_encap(skb, up->encap_type);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001056 UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 return -ret;
1058 }
1059 /* FALLTHROUGH -- it's a UDP Packet */
1060 }
1061
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001062 /*
1063 * UDP-Lite specific tests, ignored on UDP sockets
1064 */
1065 if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
1066
1067 /*
1068 * MIB statistics other than incrementing the error count are
1069 * disabled for the following two types of errors: these depend
1070 * on the application settings, not on the functioning of the
1071 * protocol stack as such.
1072 *
1073 * RFC 3828 here recommends (sec 3.3): "There should also be a
1074 * way ... to ... at least let the receiving application block
1075 * delivery of packets with coverage values less than a value
1076 * provided by the application."
1077 */
1078 if (up->pcrlen == 0) { /* full coverage was set */
1079 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
1080 "%d while full coverage %d requested\n",
1081 UDP_SKB_CB(skb)->cscov, skb->len);
1082 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 }
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001084 /* The next case involves violating the min. coverage requested
1085 * by the receiver. This is subtle: if receiver wants x and x is
1086 * greater than the buffersize/MTU then receiver will complain
1087 * that it wants x while sender emits packets of smaller size y.
1088 * Therefore the above ...()->partial_cov statement is essential.
1089 */
1090 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
1091 LIMIT_NETDEBUG(KERN_WARNING
1092 "UDPLITE: coverage %d too small, need min %d\n",
1093 UDP_SKB_CB(skb)->cscov, up->pcrlen);
1094 goto drop;
1095 }
1096 }
1097
Herbert Xu759e5d02007-03-25 20:10:56 -07001098 if (sk->sk_filter) {
1099 if (udp_lib_checksum_complete(skb))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001100 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 }
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);
Stephen Hemminger6516c652007-03-08 20:41:55 -08001145 if (sknext)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001146 skb1 = skb_clone(skb, GFP_ATOMIC);
1147
Stephen Hemminger6516c652007-03-08 20:41:55 -08001148 if (skb1) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 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;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001156 } while (sknext);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001157 } 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 */
Herbert Xu759e5d02007-03-25 20:10:56 -07001168static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
1169 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170{
Herbert Xu759e5d02007-03-25 20:10:56 -07001171 int err;
1172
1173 UDP_SKB_CB(skb)->partial_cov = 0;
1174 UDP_SKB_CB(skb)->cscov = skb->len;
1175
1176 if (proto == IPPROTO_UDPLITE) {
1177 err = udplite_checksum_init(skb, uh);
1178 if (err)
1179 return err;
1180 }
1181
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 if (uh->check == 0) {
1183 skb->ip_summed = CHECKSUM_UNNECESSARY;
Patrick McHardy84fa7932006-08-29 16:44:56 -07001184 } else if (skb->ip_summed == CHECKSUM_COMPLETE) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001185 if (!csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -07001186 skb->len, proto, skb->csum))
Herbert Xufb286bb2005-11-10 13:01:24 -08001187 skb->ip_summed = CHECKSUM_UNNECESSARY;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 }
1189 if (skb->ip_summed != CHECKSUM_UNNECESSARY)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001190 skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr,
1191 skb->nh.iph->daddr,
Herbert Xu759e5d02007-03-25 20:10:56 -07001192 skb->len, proto, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193 /* Probably, we should checksum udp header (it should be in cache
1194 * in any case) and data in tiny packets (< rx copybreak).
1195 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001196
Herbert Xu759e5d02007-03-25 20:10:56 -07001197 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198}
1199
1200/*
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001201 * All we need to do is get the socket, and then do a checksum.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 */
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001203
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001204int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
Herbert Xu759e5d02007-03-25 20:10:56 -07001205 int proto)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206{
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001207 struct sock *sk;
1208 struct udphdr *uh = skb->h.uh;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 unsigned short ulen;
1210 struct rtable *rt = (struct rtable*)skb->dst;
Al Viro734ab872006-09-27 18:37:41 -07001211 __be32 saddr = skb->nh.iph->saddr;
1212 __be32 daddr = skb->nh.iph->daddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001213
1214 /*
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001215 * Validate the packet.
Linus Torvalds1da177e2005-04-16 15:20:36 -07001216 */
1217 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001218 goto drop; /* No space for header. */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220 ulen = ntohs(uh->len);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001221 if (ulen > skb->len)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 goto short_packet;
1223
Herbert Xu759e5d02007-03-25 20:10:56 -07001224 if (proto == IPPROTO_UDP) {
1225 /* UDP validates ulen. */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001226 if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
1227 goto short_packet;
Herbert Xud6443292007-03-06 20:26:48 -08001228 uh = skb->h.uh;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001229 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230
Herbert Xu759e5d02007-03-25 20:10:56 -07001231 if (udp4_csum_init(skb, uh, proto))
1232 goto csum_error;
1233
Stephen Hemminger6516c652007-03-08 20:41:55 -08001234 if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001235 return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001237 sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest,
1238 skb->dev->ifindex, udptable );
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239
1240 if (sk != NULL) {
1241 int ret = udp_queue_rcv_skb(sk, skb);
1242 sock_put(sk);
1243
1244 /* a return value > 0 means to resubmit the input, but
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001245 * it wants the return to be -protocol, or 0
Linus Torvalds1da177e2005-04-16 15:20:36 -07001246 */
1247 if (ret > 0)
1248 return -ret;
1249 return 0;
1250 }
1251
1252 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
1253 goto drop;
Patrick McHardyb59c2702006-01-06 23:06:10 -08001254 nf_reset(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001255
1256 /* No socket. Drop packet silently, if checksum is wrong */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001257 if (udp_lib_checksum_complete(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258 goto csum_error;
1259
Herbert Xu759e5d02007-03-25 20:10:56 -07001260 UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
1262
1263 /*
1264 * Hmm. We got an UDP packet to a port to which we
1265 * don't wanna listen. Ignore it.
1266 */
1267 kfree_skb(skb);
Stephen Hemminger6516c652007-03-08 20:41:55 -08001268 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001269
1270short_packet:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001271 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 -07001272 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Patrick McHardy64ce2072005-08-09 20:50:53 -07001273 NIPQUAD(saddr),
1274 ntohs(uh->source),
1275 ulen,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001276 skb->len,
Patrick McHardy64ce2072005-08-09 20:50:53 -07001277 NIPQUAD(daddr),
1278 ntohs(uh->dest));
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001279 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280
1281csum_error:
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001282 /*
1283 * RFC1122: OK. Discards the bad packet silently (as far as
1284 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 */
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001286 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 -07001287 proto == IPPROTO_UDPLITE ? "-Lite" : "",
Patrick McHardy64ce2072005-08-09 20:50:53 -07001288 NIPQUAD(saddr),
1289 ntohs(uh->source),
1290 NIPQUAD(daddr),
1291 ntohs(uh->dest),
1292 ulen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001293drop:
Herbert Xu759e5d02007-03-25 20:10:56 -07001294 UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 kfree_skb(skb);
Stephen Hemminger6516c652007-03-08 20:41:55 -08001296 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001297}
1298
Stephen Hemminger3fbe0702007-03-08 20:46:41 -08001299int udp_rcv(struct sk_buff *skb)
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001300{
Herbert Xu759e5d02007-03-25 20:10:56 -07001301 return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001302}
1303
1304int udp_destroy_sock(struct sock *sk)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001305{
1306 lock_sock(sk);
1307 udp_flush_pending_frames(sk);
1308 release_sock(sk);
1309 return 0;
1310}
1311
1312/*
1313 * Socket option code for UDP
1314 */
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001315int udp_lib_setsockopt(struct sock *sk, int level, int optname,
1316 char __user *optval, int optlen,
1317 int (*push_pending_frames)(struct sock *))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318{
1319 struct udp_sock *up = udp_sk(sk);
1320 int val;
1321 int err = 0;
1322
Stephen Hemminger6516c652007-03-08 20:41:55 -08001323 if (optlen<sizeof(int))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001324 return -EINVAL;
1325
1326 if (get_user(val, (int __user *)optval))
1327 return -EFAULT;
1328
Stephen Hemminger6516c652007-03-08 20:41:55 -08001329 switch (optname) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330 case UDP_CORK:
1331 if (val != 0) {
1332 up->corkflag = 1;
1333 } else {
1334 up->corkflag = 0;
1335 lock_sock(sk);
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001336 (*push_pending_frames)(sk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 release_sock(sk);
1338 }
1339 break;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001340
Linus Torvalds1da177e2005-04-16 15:20:36 -07001341 case UDP_ENCAP:
1342 switch (val) {
1343 case 0:
1344 case UDP_ENCAP_ESPINUDP:
1345 case UDP_ENCAP_ESPINUDP_NON_IKE:
1346 up->encap_type = val;
1347 break;
1348 default:
1349 err = -ENOPROTOOPT;
1350 break;
1351 }
1352 break;
1353
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001354 /*
1355 * UDP-Lite's partial checksum coverage (RFC 3828).
1356 */
1357 /* The sender sets actual checksum coverage length via this option.
1358 * The case coverage > packet length is handled by send module. */
1359 case UDPLITE_SEND_CSCOV:
1360 if (!up->pcflag) /* Disable the option on UDP sockets */
1361 return -ENOPROTOOPT;
1362 if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
1363 val = 8;
1364 up->pcslen = val;
1365 up->pcflag |= UDPLITE_SEND_CC;
1366 break;
1367
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001368 /* The receiver specifies a minimum checksum coverage value. To make
1369 * sense, this should be set to at least 8 (as done below). If zero is
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001370 * used, this again means full checksum coverage. */
1371 case UDPLITE_RECV_CSCOV:
1372 if (!up->pcflag) /* Disable the option on UDP sockets */
1373 return -ENOPROTOOPT;
1374 if (val != 0 && val < 8) /* Avoid silly minimal values. */
1375 val = 8;
1376 up->pcrlen = val;
1377 up->pcflag |= UDPLITE_RECV_CC;
1378 break;
1379
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380 default:
1381 err = -ENOPROTOOPT;
1382 break;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001383 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001384
1385 return err;
1386}
1387
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001388int udp_setsockopt(struct sock *sk, int level, int optname,
1389 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001390{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001391 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001392 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1393 udp_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001394 return ip_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001395}
1396
1397#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001398int compat_udp_setsockopt(struct sock *sk, int level, int optname,
1399 char __user *optval, int optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001400{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001401 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001402 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1403 udp_push_pending_frames);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001404 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001405}
1406#endif
1407
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001408int udp_lib_getsockopt(struct sock *sk, int level, int optname,
1409 char __user *optval, int __user *optlen)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410{
1411 struct udp_sock *up = udp_sk(sk);
1412 int val, len;
1413
Stephen Hemminger6516c652007-03-08 20:41:55 -08001414 if (get_user(len,optlen))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415 return -EFAULT;
1416
1417 len = min_t(unsigned int, len, sizeof(int));
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001418
Stephen Hemminger6516c652007-03-08 20:41:55 -08001419 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001420 return -EINVAL;
1421
Stephen Hemminger6516c652007-03-08 20:41:55 -08001422 switch (optname) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 case UDP_CORK:
1424 val = up->corkflag;
1425 break;
1426
1427 case UDP_ENCAP:
1428 val = up->encap_type;
1429 break;
1430
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001431 /* The following two cannot be changed on UDP sockets, the return is
1432 * always 0 (which corresponds to the full checksum coverage of UDP). */
1433 case UDPLITE_SEND_CSCOV:
1434 val = up->pcslen;
1435 break;
1436
1437 case UDPLITE_RECV_CSCOV:
1438 val = up->pcrlen;
1439 break;
1440
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441 default:
1442 return -ENOPROTOOPT;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001443 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444
Stephen Hemminger6516c652007-03-08 20:41:55 -08001445 if (put_user(len, optlen))
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001446 return -EFAULT;
Stephen Hemminger6516c652007-03-08 20:41:55 -08001447 if (copy_to_user(optval, &val,len))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001448 return -EFAULT;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001449 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450}
1451
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001452int udp_getsockopt(struct sock *sk, int level, int optname,
1453 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 ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001458}
1459
1460#ifdef CONFIG_COMPAT
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001461int compat_udp_getsockopt(struct sock *sk, int level, int optname,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001462 char __user *optval, int __user *optlen)
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001463{
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001464 if (level == SOL_UDP || level == SOL_UDPLITE)
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001465 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001466 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001467}
1468#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001469/**
1470 * udp_poll - wait for a UDP event.
1471 * @file - file struct
1472 * @sock - socket
1473 * @wait - poll table
1474 *
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001475 * This is same as datagram poll, except for the special case of
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476 * blocking sockets. If application is using a blocking fd
1477 * and a packet with checksum error is in the queue;
1478 * then it could get return from select indicating data available
1479 * but then block when reading it. Add special case code
1480 * to work around these arguably broken applications.
1481 */
1482unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
1483{
1484 unsigned int mask = datagram_poll(file, sock, wait);
1485 struct sock *sk = sock->sk;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001486 int is_lite = IS_UDPLITE(sk);
1487
Linus Torvalds1da177e2005-04-16 15:20:36 -07001488 /* Check for false positives due to checksum errors */
1489 if ( (mask & POLLRDNORM) &&
1490 !(file->f_flags & O_NONBLOCK) &&
1491 !(sk->sk_shutdown & RCV_SHUTDOWN)){
1492 struct sk_buff_head *rcvq = &sk->sk_receive_queue;
1493 struct sk_buff *skb;
1494
Herbert Xu208d8982005-05-30 15:50:15 -07001495 spin_lock_bh(&rcvq->lock);
Herbert Xu759e5d02007-03-25 20:10:56 -07001496 while ((skb = skb_peek(rcvq)) != NULL &&
1497 udp_lib_checksum_complete(skb)) {
1498 UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_lite);
1499 __skb_unlink(skb, rcvq);
1500 kfree_skb(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001501 }
Herbert Xu208d8982005-05-30 15:50:15 -07001502 spin_unlock_bh(&rcvq->lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503
1504 /* nothing to see, move along */
1505 if (skb == NULL)
1506 mask &= ~(POLLIN | POLLRDNORM);
1507 }
1508
1509 return mask;
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001510
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511}
1512
1513struct proto udp_prot = {
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001514 .name = "UDP",
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001515 .owner = THIS_MODULE,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001516 .close = udp_lib_close,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001517 .connect = ip4_datagram_connect,
1518 .disconnect = udp_disconnect,
1519 .ioctl = udp_ioctl,
1520 .destroy = udp_destroy_sock,
1521 .setsockopt = udp_setsockopt,
1522 .getsockopt = udp_getsockopt,
1523 .sendmsg = udp_sendmsg,
1524 .recvmsg = udp_recvmsg,
1525 .sendpage = udp_sendpage,
1526 .backlog_rcv = udp_queue_rcv_skb,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001527 .hash = udp_lib_hash,
1528 .unhash = udp_lib_unhash,
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001529 .get_port = udp_v4_get_port,
1530 .obj_size = sizeof(struct udp_sock),
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001531#ifdef CONFIG_COMPAT
Arnaldo Carvalho de Melo543d9cf2006-03-20 22:48:35 -08001532 .compat_setsockopt = compat_udp_setsockopt,
1533 .compat_getsockopt = compat_udp_getsockopt,
Dmitry Mishin3fdadf72006-03-20 22:45:21 -08001534#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001535};
1536
1537/* ------------------------------------------------------------------------ */
1538#ifdef CONFIG_PROC_FS
1539
1540static struct sock *udp_get_first(struct seq_file *seq)
1541{
1542 struct sock *sk;
1543 struct udp_iter_state *state = seq->private;
1544
1545 for (state->bucket = 0; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) {
1546 struct hlist_node *node;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001547 sk_for_each(sk, node, state->hashtable + state->bucket) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548 if (sk->sk_family == state->family)
1549 goto found;
1550 }
1551 }
1552 sk = NULL;
1553found:
1554 return sk;
1555}
1556
1557static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
1558{
1559 struct udp_iter_state *state = seq->private;
1560
1561 do {
1562 sk = sk_next(sk);
1563try_again:
1564 ;
1565 } while (sk && sk->sk_family != state->family);
1566
1567 if (!sk && ++state->bucket < UDP_HTABLE_SIZE) {
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001568 sk = sk_head(state->hashtable + state->bucket);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001569 goto try_again;
1570 }
1571 return sk;
1572}
1573
1574static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos)
1575{
1576 struct sock *sk = udp_get_first(seq);
1577
1578 if (sk)
Stephen Hemminger6516c652007-03-08 20:41:55 -08001579 while (pos && (sk = udp_get_next(seq, sk)) != NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001580 --pos;
1581 return pos ? NULL : sk;
1582}
1583
1584static void *udp_seq_start(struct seq_file *seq, loff_t *pos)
1585{
1586 read_lock(&udp_hash_lock);
1587 return *pos ? udp_get_idx(seq, *pos-1) : (void *)1;
1588}
1589
1590static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
1591{
1592 struct sock *sk;
1593
1594 if (v == (void *)1)
1595 sk = udp_get_idx(seq, 0);
1596 else
1597 sk = udp_get_next(seq, v);
1598
1599 ++*pos;
1600 return sk;
1601}
1602
1603static void udp_seq_stop(struct seq_file *seq, void *v)
1604{
1605 read_unlock(&udp_hash_lock);
1606}
1607
1608static int udp_seq_open(struct inode *inode, struct file *file)
1609{
1610 struct udp_seq_afinfo *afinfo = PDE(inode)->data;
1611 struct seq_file *seq;
1612 int rc = -ENOMEM;
Panagiotis Issaris0da974f2006-07-21 14:51:30 -07001613 struct udp_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001614
1615 if (!s)
1616 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001617 s->family = afinfo->family;
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001618 s->hashtable = afinfo->hashtable;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001619 s->seq_ops.start = udp_seq_start;
1620 s->seq_ops.next = udp_seq_next;
1621 s->seq_ops.show = afinfo->seq_show;
1622 s->seq_ops.stop = udp_seq_stop;
1623
1624 rc = seq_open(file, &s->seq_ops);
1625 if (rc)
1626 goto out_kfree;
1627
1628 seq = file->private_data;
1629 seq->private = s;
1630out:
1631 return rc;
1632out_kfree:
1633 kfree(s);
1634 goto out;
1635}
1636
1637/* ------------------------------------------------------------------------ */
1638int udp_proc_register(struct udp_seq_afinfo *afinfo)
1639{
1640 struct proc_dir_entry *p;
1641 int rc = 0;
1642
1643 if (!afinfo)
1644 return -EINVAL;
1645 afinfo->seq_fops->owner = afinfo->owner;
1646 afinfo->seq_fops->open = udp_seq_open;
1647 afinfo->seq_fops->read = seq_read;
1648 afinfo->seq_fops->llseek = seq_lseek;
1649 afinfo->seq_fops->release = seq_release_private;
1650
1651 p = proc_net_fops_create(afinfo->name, S_IRUGO, afinfo->seq_fops);
1652 if (p)
1653 p->data = afinfo;
1654 else
1655 rc = -ENOMEM;
1656 return rc;
1657}
1658
1659void udp_proc_unregister(struct udp_seq_afinfo *afinfo)
1660{
1661 if (!afinfo)
1662 return;
1663 proc_net_remove(afinfo->name);
1664 memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
1665}
1666
1667/* ------------------------------------------------------------------------ */
1668static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
1669{
1670 struct inet_sock *inet = inet_sk(sp);
Al Viro734ab872006-09-27 18:37:41 -07001671 __be32 dest = inet->daddr;
1672 __be32 src = inet->rcv_saddr;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001673 __u16 destp = ntohs(inet->dport);
1674 __u16 srcp = ntohs(inet->sport);
1675
1676 sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
1677 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
YOSHIFUJI Hideakie905a9e2007-02-09 23:24:47 +09001678 bucket, src, srcp, dest, destp, sp->sk_state,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001679 atomic_read(&sp->sk_wmem_alloc),
1680 atomic_read(&sp->sk_rmem_alloc),
1681 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
1682 atomic_read(&sp->sk_refcnt), sp);
1683}
1684
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001685int udp4_seq_show(struct seq_file *seq, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001686{
1687 if (v == SEQ_START_TOKEN)
1688 seq_printf(seq, "%-127s\n",
1689 " sl local_address rem_address st tx_queue "
1690 "rx_queue tr tm->when retrnsmt uid timeout "
1691 "inode");
1692 else {
1693 char tmpbuf[129];
1694 struct udp_iter_state *state = seq->private;
1695
1696 udp4_format_sock(v, tmpbuf, state->bucket);
1697 seq_printf(seq, "%-127s\n", tmpbuf);
1698 }
1699 return 0;
1700}
1701
1702/* ------------------------------------------------------------------------ */
1703static struct file_operations udp4_seq_fops;
1704static struct udp_seq_afinfo udp4_seq_afinfo = {
1705 .owner = THIS_MODULE,
1706 .name = "udp",
1707 .family = AF_INET,
Gerrit Renkerba4e58e2006-11-27 11:10:57 -08001708 .hashtable = udp_hash,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001709 .seq_show = udp4_seq_show,
1710 .seq_fops = &udp4_seq_fops,
1711};
1712
1713int __init udp4_proc_init(void)
1714{
1715 return udp_proc_register(&udp4_seq_afinfo);
1716}
1717
1718void udp4_proc_exit(void)
1719{
1720 udp_proc_unregister(&udp4_seq_afinfo);
1721}
1722#endif /* CONFIG_PROC_FS */
1723
1724EXPORT_SYMBOL(udp_disconnect);
1725EXPORT_SYMBOL(udp_hash);
1726EXPORT_SYMBOL(udp_hash_lock);
1727EXPORT_SYMBOL(udp_ioctl);
Gerrit Renker25030a72006-08-26 20:06:05 -07001728EXPORT_SYMBOL(udp_get_port);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001729EXPORT_SYMBOL(udp_prot);
1730EXPORT_SYMBOL(udp_sendmsg);
Gerrit Renker4c0a6cb2006-11-27 09:29:59 -08001731EXPORT_SYMBOL(udp_lib_getsockopt);
1732EXPORT_SYMBOL(udp_lib_setsockopt);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001733EXPORT_SYMBOL(udp_poll);
1734
1735#ifdef CONFIG_PROC_FS
1736EXPORT_SYMBOL(udp_proc_register);
1737EXPORT_SYMBOL(udp_proc_unregister);
1738#endif