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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The User Datagram Protocol (UDP). | |
7 | * | |
8 | * Version: $Id: udp.c,v 1.102 2002/02/01 22:01:04 davem Exp $ | |
9 | * | |
02c30a84 | 10 | * Authors: Ross Biro |
1da177e4 LT |
11 | * 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 | |
e905a9ed YH |
23 | * Alan Cox : Tidied select() semantics. |
24 | * Alan Cox : udp_err() fixed properly, also now | |
1da177e4 LT |
25 | * 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 | |
e905a9ed | 59 | * for connect. |
1da177e4 LT |
60 | * 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 | |
342f0234 | 73 | * James Chapman : Add L2TP encapsulation type. |
1da177e4 LT |
74 | * |
75 | * | |
76 | * This program is free software; you can redistribute it and/or | |
77 | * modify it under the terms of the GNU General Public License | |
78 | * as published by the Free Software Foundation; either version | |
79 | * 2 of the License, or (at your option) any later version. | |
80 | */ | |
e905a9ed | 81 | |
1da177e4 LT |
82 | #include <asm/system.h> |
83 | #include <asm/uaccess.h> | |
84 | #include <asm/ioctls.h> | |
85 | #include <linux/types.h> | |
86 | #include <linux/fcntl.h> | |
87 | #include <linux/module.h> | |
88 | #include <linux/socket.h> | |
89 | #include <linux/sockios.h> | |
14c85021 | 90 | #include <linux/igmp.h> |
1da177e4 LT |
91 | #include <linux/in.h> |
92 | #include <linux/errno.h> | |
93 | #include <linux/timer.h> | |
94 | #include <linux/mm.h> | |
1da177e4 | 95 | #include <linux/inet.h> |
1da177e4 | 96 | #include <linux/netdevice.h> |
c752f073 | 97 | #include <net/tcp_states.h> |
1da177e4 LT |
98 | #include <linux/skbuff.h> |
99 | #include <linux/proc_fs.h> | |
100 | #include <linux/seq_file.h> | |
457c4cbc | 101 | #include <net/net_namespace.h> |
1da177e4 LT |
102 | #include <net/icmp.h> |
103 | #include <net/route.h> | |
1da177e4 LT |
104 | #include <net/checksum.h> |
105 | #include <net/xfrm.h> | |
ba4e58ec | 106 | #include "udp_impl.h" |
1da177e4 LT |
107 | |
108 | /* | |
109 | * Snmp MIB for the UDP layer | |
110 | */ | |
111 | ||
ba89966c | 112 | DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly; |
1da177e4 LT |
113 | |
114 | struct hlist_head udp_hash[UDP_HTABLE_SIZE]; | |
115 | DEFINE_RWLOCK(udp_hash_lock); | |
116 | ||
32c1da70 SH |
117 | static inline int __udp_lib_lport_inuse(__u16 num, |
118 | const struct hlist_head udptable[]) | |
1da177e4 | 119 | { |
25030a7f | 120 | struct sock *sk; |
1da177e4 | 121 | struct hlist_node *node; |
25030a7f | 122 | |
df2bc459 DM |
123 | sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)]) |
124 | if (sk->sk_hash == num) | |
25030a7f GR |
125 | return 1; |
126 | return 0; | |
127 | } | |
128 | ||
129 | /** | |
ba4e58ec | 130 | * __udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
131 | * |
132 | * @sk: socket struct in question | |
133 | * @snum: port number to look up | |
ba4e58ec | 134 | * @udptable: hash list table, must be of UDP_HTABLE_SIZE |
df2bc459 | 135 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
25030a7f | 136 | */ |
ba4e58ec | 137 | int __udp_lib_get_port(struct sock *sk, unsigned short snum, |
32c1da70 | 138 | struct hlist_head udptable[], |
df2bc459 DM |
139 | int (*saddr_comp)(const struct sock *sk1, |
140 | const struct sock *sk2 ) ) | |
25030a7f GR |
141 | { |
142 | struct hlist_node *node; | |
143 | struct hlist_head *head; | |
1da177e4 | 144 | struct sock *sk2; |
25030a7f | 145 | int error = 1; |
1da177e4 LT |
146 | |
147 | write_lock_bh(&udp_hash_lock); | |
32c1da70 SH |
148 | |
149 | if (!snum) { | |
a25de534 | 150 | int i, low, high, remaining; |
32c1da70 SH |
151 | unsigned rover, best, best_size_so_far; |
152 | ||
227b60f5 | 153 | inet_get_local_port_range(&low, &high); |
a25de534 | 154 | remaining = (high - low) + 1; |
227b60f5 | 155 | |
32c1da70 | 156 | best_size_so_far = UINT_MAX; |
a25de534 | 157 | best = rover = net_random() % remaining + low; |
32c1da70 SH |
158 | |
159 | /* 1st pass: look for empty (or shortest) hash chain */ | |
160 | for (i = 0; i < UDP_HTABLE_SIZE; i++) { | |
161 | int size = 0; | |
162 | ||
163 | head = &udptable[rover & (UDP_HTABLE_SIZE - 1)]; | |
164 | if (hlist_empty(head)) | |
1da177e4 | 165 | goto gotit; |
32c1da70 | 166 | |
5c668704 DM |
167 | sk_for_each(sk2, node, head) { |
168 | if (++size >= best_size_so_far) | |
169 | goto next; | |
170 | } | |
171 | best_size_so_far = size; | |
32c1da70 | 172 | best = rover; |
5c668704 | 173 | next: |
32c1da70 SH |
174 | /* fold back if end of range */ |
175 | if (++rover > high) | |
176 | rover = low + ((rover - low) | |
177 | & (UDP_HTABLE_SIZE - 1)); | |
178 | ||
179 | ||
1da177e4 | 180 | } |
32c1da70 SH |
181 | |
182 | /* 2nd pass: find hole in shortest hash chain */ | |
183 | rover = best; | |
184 | for (i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++) { | |
185 | if (! __udp_lib_lport_inuse(rover, udptable)) | |
186 | goto gotit; | |
187 | rover += UDP_HTABLE_SIZE; | |
188 | if (rover > high) | |
189 | rover = low + ((rover - low) | |
190 | & (UDP_HTABLE_SIZE - 1)); | |
1da177e4 | 191 | } |
32c1da70 SH |
192 | |
193 | ||
194 | /* All ports in use! */ | |
195 | goto fail; | |
196 | ||
1da177e4 | 197 | gotit: |
32c1da70 | 198 | snum = rover; |
1da177e4 | 199 | } else { |
df2bc459 | 200 | head = &udptable[snum & (UDP_HTABLE_SIZE - 1)]; |
25030a7f GR |
201 | |
202 | sk_for_each(sk2, node, head) | |
df2bc459 DM |
203 | if (sk2->sk_hash == snum && |
204 | sk2 != sk && | |
205 | (!sk2->sk_reuse || !sk->sk_reuse) && | |
206 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if | |
207 | || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
208 | (*saddr_comp)(sk, sk2) ) | |
1da177e4 | 209 | goto fail; |
1da177e4 | 210 | } |
32c1da70 | 211 | |
25030a7f | 212 | inet_sk(sk)->num = snum; |
df2bc459 | 213 | sk->sk_hash = snum; |
1da177e4 | 214 | if (sk_unhashed(sk)) { |
df2bc459 | 215 | head = &udptable[snum & (UDP_HTABLE_SIZE - 1)]; |
25030a7f | 216 | sk_add_node(sk, head); |
1da177e4 LT |
217 | sock_prot_inc_use(sk->sk_prot); |
218 | } | |
25030a7f | 219 | error = 0; |
1da177e4 LT |
220 | fail: |
221 | write_unlock_bh(&udp_hash_lock); | |
25030a7f GR |
222 | return error; |
223 | } | |
224 | ||
3fbe070a | 225 | int udp_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 226 | int (*scmp)(const struct sock *, const struct sock *)) |
ba4e58ec | 227 | { |
32c1da70 | 228 | return __udp_lib_get_port(sk, snum, udp_hash, scmp); |
ba4e58ec GR |
229 | } |
230 | ||
df2bc459 | 231 | int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
25030a7f GR |
232 | { |
233 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); | |
234 | ||
235 | return ( !ipv6_only_sock(sk2) && | |
236 | (!inet1->rcv_saddr || !inet2->rcv_saddr || | |
237 | inet1->rcv_saddr == inet2->rcv_saddr )); | |
238 | } | |
239 | ||
240 | static inline int udp_v4_get_port(struct sock *sk, unsigned short snum) | |
241 | { | |
df2bc459 | 242 | return udp_get_port(sk, snum, ipv4_rcv_saddr_equal); |
1da177e4 LT |
243 | } |
244 | ||
1da177e4 LT |
245 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
246 | * harder than this. -DaveM | |
247 | */ | |
ba4e58ec GR |
248 | static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport, |
249 | __be32 daddr, __be16 dport, | |
250 | int dif, struct hlist_head udptable[]) | |
1da177e4 LT |
251 | { |
252 | struct sock *sk, *result = NULL; | |
253 | struct hlist_node *node; | |
df2bc459 DM |
254 | unsigned short hnum = ntohs(dport); |
255 | int badness = -1; | |
1da177e4 | 256 | |
ba4e58ec | 257 | read_lock(&udp_hash_lock); |
df2bc459 | 258 | sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) { |
1da177e4 LT |
259 | struct inet_sock *inet = inet_sk(sk); |
260 | ||
df2bc459 DM |
261 | if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) { |
262 | int score = (sk->sk_family == PF_INET ? 1 : 0); | |
263 | if (inet->rcv_saddr) { | |
264 | if (inet->rcv_saddr != daddr) | |
265 | continue; | |
266 | score+=2; | |
267 | } | |
268 | if (inet->daddr) { | |
269 | if (inet->daddr != saddr) | |
270 | continue; | |
271 | score+=2; | |
272 | } | |
273 | if (inet->dport) { | |
274 | if (inet->dport != sport) | |
275 | continue; | |
276 | score+=2; | |
277 | } | |
278 | if (sk->sk_bound_dev_if) { | |
279 | if (sk->sk_bound_dev_if != dif) | |
280 | continue; | |
281 | score+=2; | |
282 | } | |
283 | if (score == 9) { | |
284 | result = sk; | |
285 | break; | |
286 | } else if (score > badness) { | |
287 | result = sk; | |
288 | badness = score; | |
289 | } | |
1da177e4 LT |
290 | } |
291 | } | |
ba4e58ec GR |
292 | if (result) |
293 | sock_hold(result); | |
1da177e4 | 294 | read_unlock(&udp_hash_lock); |
ba4e58ec | 295 | return result; |
1da177e4 LT |
296 | } |
297 | ||
df2bc459 DM |
298 | static inline struct sock *udp_v4_mcast_next(struct sock *sk, |
299 | __be16 loc_port, __be32 loc_addr, | |
b7b5f487 DM |
300 | __be16 rmt_port, __be32 rmt_addr, |
301 | int dif) | |
1da177e4 LT |
302 | { |
303 | struct hlist_node *node; | |
304 | struct sock *s = sk; | |
df2bc459 | 305 | unsigned short hnum = ntohs(loc_port); |
1da177e4 LT |
306 | |
307 | sk_for_each_from(s, node) { | |
308 | struct inet_sock *inet = inet_sk(s); | |
309 | ||
95f30b33 | 310 | if (s->sk_hash != hnum || |
1da177e4 LT |
311 | (inet->daddr && inet->daddr != rmt_addr) || |
312 | (inet->dport != rmt_port && inet->dport) || | |
313 | (inet->rcv_saddr && inet->rcv_saddr != loc_addr) || | |
314 | ipv6_only_sock(s) || | |
315 | (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) | |
316 | continue; | |
317 | if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) | |
318 | continue; | |
319 | goto found; | |
e905a9ed | 320 | } |
1da177e4 LT |
321 | s = NULL; |
322 | found: | |
e905a9ed | 323 | return s; |
1da177e4 LT |
324 | } |
325 | ||
326 | /* | |
327 | * This routine is called by the ICMP module when it gets some | |
328 | * sort of error condition. If err < 0 then the socket should | |
329 | * be closed and the error returned to the user. If err > 0 | |
e905a9ed | 330 | * it's just the icmp type << 8 | icmp code. |
1da177e4 LT |
331 | * Header points to the ip header of the error packet. We move |
332 | * on past this. Then (as it used to claim before adjustment) | |
333 | * header points to the first 8 bytes of the udp header. We need | |
334 | * to find the appropriate port. | |
335 | */ | |
336 | ||
ba4e58ec | 337 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[]) |
1da177e4 LT |
338 | { |
339 | struct inet_sock *inet; | |
340 | struct iphdr *iph = (struct iphdr*)skb->data; | |
341 | struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2)); | |
88c7664f ACM |
342 | const int type = icmp_hdr(skb)->type; |
343 | const int code = icmp_hdr(skb)->code; | |
1da177e4 LT |
344 | struct sock *sk; |
345 | int harderr; | |
346 | int err; | |
347 | ||
ba4e58ec GR |
348 | sk = __udp4_lib_lookup(iph->daddr, uh->dest, iph->saddr, uh->source, |
349 | skb->dev->ifindex, udptable ); | |
1da177e4 LT |
350 | if (sk == NULL) { |
351 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
e905a9ed | 352 | return; /* No socket for error */ |
1da177e4 LT |
353 | } |
354 | ||
355 | err = 0; | |
356 | harderr = 0; | |
357 | inet = inet_sk(sk); | |
358 | ||
359 | switch (type) { | |
360 | default: | |
361 | case ICMP_TIME_EXCEEDED: | |
362 | err = EHOSTUNREACH; | |
363 | break; | |
364 | case ICMP_SOURCE_QUENCH: | |
365 | goto out; | |
366 | case ICMP_PARAMETERPROB: | |
367 | err = EPROTO; | |
368 | harderr = 1; | |
369 | break; | |
370 | case ICMP_DEST_UNREACH: | |
371 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
372 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { | |
373 | err = EMSGSIZE; | |
374 | harderr = 1; | |
375 | break; | |
376 | } | |
377 | goto out; | |
378 | } | |
379 | err = EHOSTUNREACH; | |
380 | if (code <= NR_ICMP_UNREACH) { | |
381 | harderr = icmp_err_convert[code].fatal; | |
382 | err = icmp_err_convert[code].errno; | |
383 | } | |
384 | break; | |
385 | } | |
386 | ||
387 | /* | |
e905a9ed | 388 | * RFC1122: OK. Passes ICMP errors back to application, as per |
1da177e4 LT |
389 | * 4.1.3.3. |
390 | */ | |
391 | if (!inet->recverr) { | |
392 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
393 | goto out; | |
394 | } else { | |
395 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1)); | |
396 | } | |
397 | sk->sk_err = err; | |
398 | sk->sk_error_report(sk); | |
399 | out: | |
400 | sock_put(sk); | |
401 | } | |
402 | ||
3fbe070a | 403 | void udp_err(struct sk_buff *skb, u32 info) |
ba4e58ec GR |
404 | { |
405 | return __udp4_lib_err(skb, info, udp_hash); | |
406 | } | |
407 | ||
1da177e4 LT |
408 | /* |
409 | * Throw away all pending data and cancel the corking. Socket is locked. | |
410 | */ | |
411 | static void udp_flush_pending_frames(struct sock *sk) | |
412 | { | |
413 | struct udp_sock *up = udp_sk(sk); | |
414 | ||
415 | if (up->pending) { | |
416 | up->len = 0; | |
417 | up->pending = 0; | |
418 | ip_flush_pending_frames(sk); | |
419 | } | |
420 | } | |
421 | ||
ba4e58ec GR |
422 | /** |
423 | * udp4_hwcsum_outgoing - handle outgoing HW checksumming | |
424 | * @sk: socket we are sending on | |
425 | * @skb: sk_buff containing the filled-in UDP header | |
426 | * (checksum field must be zeroed out) | |
427 | */ | |
428 | static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
429 | __be32 src, __be32 dst, int len ) | |
430 | { | |
6b11687e | 431 | unsigned int offset; |
4bedb452 | 432 | struct udphdr *uh = udp_hdr(skb); |
6b11687e | 433 | __wsum csum = 0; |
ba4e58ec GR |
434 | |
435 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
436 | /* | |
437 | * Only one fragment on the socket. | |
438 | */ | |
663ead3b | 439 | skb->csum_start = skb_transport_header(skb) - skb->head; |
ff1dcadb | 440 | skb->csum_offset = offsetof(struct udphdr, check); |
ba4e58ec GR |
441 | uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0); |
442 | } else { | |
443 | /* | |
444 | * HW-checksum won't work as there are two or more | |
445 | * fragments on the socket so that all csums of sk_buffs | |
446 | * should be together | |
447 | */ | |
ea2ae17d | 448 | offset = skb_transport_offset(skb); |
ba4e58ec GR |
449 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
450 | ||
451 | skb->ip_summed = CHECKSUM_NONE; | |
452 | ||
453 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
454 | csum = csum_add(csum, skb->csum); | |
455 | } | |
456 | ||
457 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); | |
458 | if (uh->check == 0) | |
f6ab0288 | 459 | uh->check = CSUM_MANGLED_0; |
ba4e58ec GR |
460 | } |
461 | } | |
462 | ||
1da177e4 LT |
463 | /* |
464 | * Push out all pending data as one UDP datagram. Socket is locked. | |
465 | */ | |
4c0a6cb0 | 466 | static int udp_push_pending_frames(struct sock *sk) |
1da177e4 | 467 | { |
4c0a6cb0 | 468 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
469 | struct inet_sock *inet = inet_sk(sk); |
470 | struct flowi *fl = &inet->cork.fl; | |
471 | struct sk_buff *skb; | |
472 | struct udphdr *uh; | |
473 | int err = 0; | |
8e5200f5 | 474 | __wsum csum = 0; |
1da177e4 LT |
475 | |
476 | /* Grab the skbuff where UDP header space exists. */ | |
477 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
478 | goto out; | |
479 | ||
480 | /* | |
481 | * Create a UDP header | |
482 | */ | |
4bedb452 | 483 | uh = udp_hdr(skb); |
1da177e4 LT |
484 | uh->source = fl->fl_ip_sport; |
485 | uh->dest = fl->fl_ip_dport; | |
486 | uh->len = htons(up->len); | |
487 | uh->check = 0; | |
488 | ||
ba4e58ec GR |
489 | if (up->pcflag) /* UDP-Lite */ |
490 | csum = udplite_csum_outgoing(sk, skb); | |
491 | ||
492 | else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */ | |
493 | ||
1da177e4 LT |
494 | skb->ip_summed = CHECKSUM_NONE; |
495 | goto send; | |
1da177e4 | 496 | |
ba4e58ec | 497 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
1da177e4 | 498 | |
ba4e58ec GR |
499 | udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len); |
500 | goto send; | |
501 | ||
502 | } else /* `normal' UDP */ | |
503 | csum = udp_csum_outgoing(sk, skb); | |
504 | ||
505 | /* add protocol-dependent pseudo-header */ | |
506 | uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len, | |
507 | sk->sk_protocol, csum ); | |
508 | if (uh->check == 0) | |
f6ab0288 | 509 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 510 | |
1da177e4 LT |
511 | send: |
512 | err = ip_push_pending_frames(sk); | |
513 | out: | |
514 | up->len = 0; | |
515 | up->pending = 0; | |
2a0c6c98 YH |
516 | if (!err) |
517 | UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, up->pcflag); | |
1da177e4 LT |
518 | return err; |
519 | } | |
520 | ||
1da177e4 LT |
521 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
522 | size_t len) | |
523 | { | |
524 | struct inet_sock *inet = inet_sk(sk); | |
525 | struct udp_sock *up = udp_sk(sk); | |
526 | int ulen = len; | |
527 | struct ipcm_cookie ipc; | |
528 | struct rtable *rt = NULL; | |
529 | int free = 0; | |
530 | int connected = 0; | |
3ca3c68e | 531 | __be32 daddr, faddr, saddr; |
734ab87f | 532 | __be16 dport; |
1da177e4 | 533 | u8 tos; |
ba4e58ec | 534 | int err, is_udplite = up->pcflag; |
1da177e4 | 535 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
ba4e58ec | 536 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
537 | |
538 | if (len > 0xFFFF) | |
539 | return -EMSGSIZE; | |
540 | ||
e905a9ed | 541 | /* |
1da177e4 LT |
542 | * Check the flags. |
543 | */ | |
544 | ||
545 | if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */ | |
546 | return -EOPNOTSUPP; | |
547 | ||
548 | ipc.opt = NULL; | |
549 | ||
550 | if (up->pending) { | |
551 | /* | |
552 | * There are pending frames. | |
e905a9ed | 553 | * The socket lock must be held while it's corked. |
1da177e4 LT |
554 | */ |
555 | lock_sock(sk); | |
556 | if (likely(up->pending)) { | |
557 | if (unlikely(up->pending != AF_INET)) { | |
558 | release_sock(sk); | |
559 | return -EINVAL; | |
560 | } | |
e905a9ed | 561 | goto do_append_data; |
1da177e4 LT |
562 | } |
563 | release_sock(sk); | |
564 | } | |
565 | ulen += sizeof(struct udphdr); | |
566 | ||
567 | /* | |
e905a9ed | 568 | * Get and verify the address. |
1da177e4 LT |
569 | */ |
570 | if (msg->msg_name) { | |
571 | struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name; | |
572 | if (msg->msg_namelen < sizeof(*usin)) | |
573 | return -EINVAL; | |
574 | if (usin->sin_family != AF_INET) { | |
575 | if (usin->sin_family != AF_UNSPEC) | |
576 | return -EAFNOSUPPORT; | |
577 | } | |
578 | ||
579 | daddr = usin->sin_addr.s_addr; | |
580 | dport = usin->sin_port; | |
581 | if (dport == 0) | |
582 | return -EINVAL; | |
583 | } else { | |
584 | if (sk->sk_state != TCP_ESTABLISHED) | |
585 | return -EDESTADDRREQ; | |
586 | daddr = inet->daddr; | |
587 | dport = inet->dport; | |
588 | /* Open fast path for connected socket. | |
589 | Route will not be used, if at least one option is set. | |
590 | */ | |
591 | connected = 1; | |
e905a9ed | 592 | } |
1da177e4 LT |
593 | ipc.addr = inet->saddr; |
594 | ||
595 | ipc.oif = sk->sk_bound_dev_if; | |
596 | if (msg->msg_controllen) { | |
597 | err = ip_cmsg_send(msg, &ipc); | |
598 | if (err) | |
599 | return err; | |
600 | if (ipc.opt) | |
601 | free = 1; | |
602 | connected = 0; | |
603 | } | |
604 | if (!ipc.opt) | |
605 | ipc.opt = inet->opt; | |
606 | ||
607 | saddr = ipc.addr; | |
608 | ipc.addr = faddr = daddr; | |
609 | ||
610 | if (ipc.opt && ipc.opt->srr) { | |
611 | if (!daddr) | |
612 | return -EINVAL; | |
613 | faddr = ipc.opt->faddr; | |
614 | connected = 0; | |
615 | } | |
616 | tos = RT_TOS(inet->tos); | |
617 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
e905a9ed | 618 | (msg->msg_flags & MSG_DONTROUTE) || |
1da177e4 LT |
619 | (ipc.opt && ipc.opt->is_strictroute)) { |
620 | tos |= RTO_ONLINK; | |
621 | connected = 0; | |
622 | } | |
623 | ||
624 | if (MULTICAST(daddr)) { | |
625 | if (!ipc.oif) | |
626 | ipc.oif = inet->mc_index; | |
627 | if (!saddr) | |
628 | saddr = inet->mc_addr; | |
629 | connected = 0; | |
630 | } | |
631 | ||
632 | if (connected) | |
633 | rt = (struct rtable*)sk_dst_check(sk, 0); | |
634 | ||
635 | if (rt == NULL) { | |
636 | struct flowi fl = { .oif = ipc.oif, | |
637 | .nl_u = { .ip4_u = | |
638 | { .daddr = faddr, | |
639 | .saddr = saddr, | |
640 | .tos = tos } }, | |
ba4e58ec | 641 | .proto = sk->sk_protocol, |
1da177e4 LT |
642 | .uli_u = { .ports = |
643 | { .sport = inet->sport, | |
644 | .dport = dport } } }; | |
beb8d13b | 645 | security_sk_classify_flow(sk, &fl); |
8eb9086f | 646 | err = ip_route_output_flow(&rt, &fl, sk, 1); |
584bdf8c WD |
647 | if (err) { |
648 | if (err == -ENETUNREACH) | |
649 | IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
1da177e4 | 650 | goto out; |
584bdf8c | 651 | } |
1da177e4 LT |
652 | |
653 | err = -EACCES; | |
654 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
655 | !sock_flag(sk, SOCK_BROADCAST)) | |
656 | goto out; | |
657 | if (connected) | |
658 | sk_dst_set(sk, dst_clone(&rt->u.dst)); | |
659 | } | |
660 | ||
661 | if (msg->msg_flags&MSG_CONFIRM) | |
662 | goto do_confirm; | |
663 | back_from_confirm: | |
664 | ||
665 | saddr = rt->rt_src; | |
666 | if (!ipc.addr) | |
667 | daddr = ipc.addr = rt->rt_dst; | |
668 | ||
669 | lock_sock(sk); | |
670 | if (unlikely(up->pending)) { | |
671 | /* The socket is already corked while preparing it. */ | |
672 | /* ... which is an evident application bug. --ANK */ | |
673 | release_sock(sk); | |
674 | ||
64ce2073 | 675 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
676 | err = -EINVAL; |
677 | goto out; | |
678 | } | |
679 | /* | |
680 | * Now cork the socket to pend data. | |
681 | */ | |
682 | inet->cork.fl.fl4_dst = daddr; | |
683 | inet->cork.fl.fl_ip_dport = dport; | |
684 | inet->cork.fl.fl4_src = saddr; | |
685 | inet->cork.fl.fl_ip_sport = inet->sport; | |
686 | up->pending = AF_INET; | |
687 | ||
688 | do_append_data: | |
689 | up->len += ulen; | |
ba4e58ec GR |
690 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
691 | err = ip_append_data(sk, getfrag, msg->msg_iov, ulen, | |
692 | sizeof(struct udphdr), &ipc, rt, | |
1da177e4 LT |
693 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
694 | if (err) | |
695 | udp_flush_pending_frames(sk); | |
696 | else if (!corkreq) | |
4c0a6cb0 | 697 | err = udp_push_pending_frames(sk); |
1e0c14f4 HX |
698 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
699 | up->pending = 0; | |
1da177e4 LT |
700 | release_sock(sk); |
701 | ||
702 | out: | |
703 | ip_rt_put(rt); | |
704 | if (free) | |
705 | kfree(ipc.opt); | |
2a0c6c98 | 706 | if (!err) |
1da177e4 | 707 | return len; |
81aa646c MB |
708 | /* |
709 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
710 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
711 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
712 | * things). We could add another new stat but at least for now that | |
713 | * seems like overkill. | |
714 | */ | |
715 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
ba4e58ec | 716 | UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); |
81aa646c | 717 | } |
1da177e4 LT |
718 | return err; |
719 | ||
720 | do_confirm: | |
721 | dst_confirm(&rt->u.dst); | |
722 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
723 | goto back_from_confirm; | |
724 | err = 0; | |
725 | goto out; | |
726 | } | |
727 | ||
ba4e58ec GR |
728 | int udp_sendpage(struct sock *sk, struct page *page, int offset, |
729 | size_t size, int flags) | |
1da177e4 LT |
730 | { |
731 | struct udp_sock *up = udp_sk(sk); | |
732 | int ret; | |
733 | ||
734 | if (!up->pending) { | |
735 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
736 | ||
737 | /* Call udp_sendmsg to specify destination address which | |
738 | * sendpage interface can't pass. | |
739 | * This will succeed only when the socket is connected. | |
740 | */ | |
741 | ret = udp_sendmsg(NULL, sk, &msg, 0); | |
742 | if (ret < 0) | |
743 | return ret; | |
744 | } | |
745 | ||
746 | lock_sock(sk); | |
747 | ||
748 | if (unlikely(!up->pending)) { | |
749 | release_sock(sk); | |
750 | ||
64ce2073 | 751 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n"); |
1da177e4 LT |
752 | return -EINVAL; |
753 | } | |
754 | ||
755 | ret = ip_append_page(sk, page, offset, size, flags); | |
756 | if (ret == -EOPNOTSUPP) { | |
757 | release_sock(sk); | |
758 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
759 | size, flags); | |
760 | } | |
761 | if (ret < 0) { | |
762 | udp_flush_pending_frames(sk); | |
763 | goto out; | |
764 | } | |
765 | ||
766 | up->len += size; | |
767 | if (!(up->corkflag || (flags&MSG_MORE))) | |
4c0a6cb0 | 768 | ret = udp_push_pending_frames(sk); |
1da177e4 LT |
769 | if (!ret) |
770 | ret = size; | |
771 | out: | |
772 | release_sock(sk); | |
773 | return ret; | |
774 | } | |
775 | ||
776 | /* | |
777 | * IOCTL requests applicable to the UDP protocol | |
778 | */ | |
e905a9ed | 779 | |
1da177e4 LT |
780 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
781 | { | |
6516c655 SH |
782 | switch (cmd) { |
783 | case SIOCOUTQ: | |
1da177e4 | 784 | { |
6516c655 SH |
785 | int amount = atomic_read(&sk->sk_wmem_alloc); |
786 | return put_user(amount, (int __user *)arg); | |
787 | } | |
1da177e4 | 788 | |
6516c655 SH |
789 | case SIOCINQ: |
790 | { | |
791 | struct sk_buff *skb; | |
792 | unsigned long amount; | |
793 | ||
794 | amount = 0; | |
795 | spin_lock_bh(&sk->sk_receive_queue.lock); | |
796 | skb = skb_peek(&sk->sk_receive_queue); | |
797 | if (skb != NULL) { | |
798 | /* | |
799 | * We will only return the amount | |
800 | * of this packet since that is all | |
801 | * that will be read. | |
802 | */ | |
803 | amount = skb->len - sizeof(struct udphdr); | |
1da177e4 | 804 | } |
6516c655 SH |
805 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
806 | return put_user(amount, (int __user *)arg); | |
807 | } | |
1da177e4 | 808 | |
6516c655 SH |
809 | default: |
810 | return -ENOIOCTLCMD; | |
1da177e4 | 811 | } |
6516c655 SH |
812 | |
813 | return 0; | |
1da177e4 LT |
814 | } |
815 | ||
1da177e4 LT |
816 | /* |
817 | * This should be easy, if there is something there we | |
818 | * return it, otherwise we block. | |
819 | */ | |
820 | ||
ba4e58ec | 821 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
e905a9ed | 822 | size_t len, int noblock, int flags, int *addr_len) |
1da177e4 LT |
823 | { |
824 | struct inet_sock *inet = inet_sk(sk); | |
e905a9ed YH |
825 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; |
826 | struct sk_buff *skb; | |
759e5d00 HX |
827 | unsigned int ulen, copied; |
828 | int err; | |
829 | int is_udplite = IS_UDPLITE(sk); | |
1da177e4 LT |
830 | |
831 | /* | |
832 | * Check any passed addresses | |
833 | */ | |
834 | if (addr_len) | |
835 | *addr_len=sizeof(*sin); | |
836 | ||
837 | if (flags & MSG_ERRQUEUE) | |
838 | return ip_recv_error(sk, msg, len); | |
839 | ||
840 | try_again: | |
841 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
842 | if (!skb) | |
843 | goto out; | |
e905a9ed | 844 | |
759e5d00 HX |
845 | ulen = skb->len - sizeof(struct udphdr); |
846 | copied = len; | |
847 | if (copied > ulen) | |
848 | copied = ulen; | |
849 | else if (copied < ulen) | |
1da177e4 | 850 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 851 | |
ba4e58ec | 852 | /* |
759e5d00 HX |
853 | * If checksum is needed at all, try to do it while copying the |
854 | * data. If the data is truncated, or if we only want a partial | |
855 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 856 | */ |
ba4e58ec | 857 | |
759e5d00 HX |
858 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
859 | if (udp_lib_checksum_complete(skb)) | |
1da177e4 | 860 | goto csum_copy_err; |
ba4e58ec GR |
861 | } |
862 | ||
60476372 | 863 | if (skb_csum_unnecessary(skb)) |
ba4e58ec GR |
864 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
865 | msg->msg_iov, copied ); | |
866 | else { | |
1da177e4 LT |
867 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
868 | ||
869 | if (err == -EINVAL) | |
870 | goto csum_copy_err; | |
871 | } | |
872 | ||
873 | if (err) | |
874 | goto out_free; | |
875 | ||
876 | sock_recv_timestamp(msg, sk, skb); | |
877 | ||
878 | /* Copy the address. */ | |
879 | if (sin) | |
880 | { | |
881 | sin->sin_family = AF_INET; | |
4bedb452 | 882 | sin->sin_port = udp_hdr(skb)->source; |
eddc9ec5 | 883 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
1da177e4 | 884 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
e905a9ed | 885 | } |
1da177e4 LT |
886 | if (inet->cmsg_flags) |
887 | ip_cmsg_recv(msg, skb); | |
888 | ||
889 | err = copied; | |
890 | if (flags & MSG_TRUNC) | |
759e5d00 | 891 | err = ulen; |
e905a9ed | 892 | |
1da177e4 | 893 | out_free: |
e905a9ed | 894 | skb_free_datagram(sk, skb); |
1da177e4 | 895 | out: |
e905a9ed | 896 | return err; |
1da177e4 LT |
897 | |
898 | csum_copy_err: | |
ba4e58ec | 899 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite); |
1da177e4 | 900 | |
3305b80c | 901 | skb_kill_datagram(sk, skb, flags); |
1da177e4 LT |
902 | |
903 | if (noblock) | |
e905a9ed | 904 | return -EAGAIN; |
1da177e4 LT |
905 | goto try_again; |
906 | } | |
907 | ||
908 | ||
909 | int udp_disconnect(struct sock *sk, int flags) | |
910 | { | |
911 | struct inet_sock *inet = inet_sk(sk); | |
912 | /* | |
913 | * 1003.1g - break association. | |
914 | */ | |
e905a9ed | 915 | |
1da177e4 LT |
916 | sk->sk_state = TCP_CLOSE; |
917 | inet->daddr = 0; | |
918 | inet->dport = 0; | |
919 | sk->sk_bound_dev_if = 0; | |
920 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
921 | inet_reset_saddr(sk); | |
922 | ||
923 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
924 | sk->sk_prot->unhash(sk); | |
925 | inet->sport = 0; | |
926 | } | |
927 | sk_dst_reset(sk); | |
928 | return 0; | |
929 | } | |
930 | ||
1da177e4 LT |
931 | /* returns: |
932 | * -1: error | |
933 | * 0: success | |
934 | * >0: "udp encap" protocol resubmission | |
935 | * | |
936 | * Note that in the success and error cases, the skb is assumed to | |
937 | * have either been requeued or freed. | |
938 | */ | |
ba4e58ec | 939 | int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) |
1da177e4 LT |
940 | { |
941 | struct udp_sock *up = udp_sk(sk); | |
81aa646c | 942 | int rc; |
1da177e4 LT |
943 | |
944 | /* | |
945 | * Charge it to the socket, dropping if the queue is full. | |
946 | */ | |
ba4e58ec GR |
947 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
948 | goto drop; | |
b59c2701 | 949 | nf_reset(skb); |
1da177e4 LT |
950 | |
951 | if (up->encap_type) { | |
952 | /* | |
067b207b JC |
953 | * This is an encapsulation socket so pass the skb to |
954 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
955 | * fall through and pass this up the UDP socket. | |
956 | * up->encap_rcv() returns the following value: | |
957 | * =0 if skb was successfully passed to the encap | |
958 | * handler or was discarded by it. | |
959 | * >0 if skb should be passed on to UDP. | |
960 | * <0 if skb should be resubmitted as proto -N | |
1da177e4 | 961 | */ |
1da177e4 | 962 | |
067b207b | 963 | /* if we're overly short, let UDP handle it */ |
3be550f3 PM |
964 | if (skb->len > sizeof(struct udphdr) && |
965 | up->encap_rcv != NULL) { | |
067b207b JC |
966 | int ret; |
967 | ||
968 | ret = (*up->encap_rcv)(sk, skb); | |
969 | if (ret <= 0) { | |
970 | UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); | |
971 | return -ret; | |
342f0234 JC |
972 | } |
973 | } | |
974 | ||
1da177e4 LT |
975 | /* FALLTHROUGH -- it's a UDP Packet */ |
976 | } | |
977 | ||
ba4e58ec GR |
978 | /* |
979 | * UDP-Lite specific tests, ignored on UDP sockets | |
980 | */ | |
981 | if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
982 | ||
983 | /* | |
984 | * MIB statistics other than incrementing the error count are | |
985 | * disabled for the following two types of errors: these depend | |
986 | * on the application settings, not on the functioning of the | |
987 | * protocol stack as such. | |
988 | * | |
989 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
990 | * way ... to ... at least let the receiving application block | |
991 | * delivery of packets with coverage values less than a value | |
992 | * provided by the application." | |
993 | */ | |
994 | if (up->pcrlen == 0) { /* full coverage was set */ | |
995 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage " | |
996 | "%d while full coverage %d requested\n", | |
997 | UDP_SKB_CB(skb)->cscov, skb->len); | |
998 | goto drop; | |
1da177e4 | 999 | } |
ba4e58ec GR |
1000 | /* The next case involves violating the min. coverage requested |
1001 | * by the receiver. This is subtle: if receiver wants x and x is | |
1002 | * greater than the buffersize/MTU then receiver will complain | |
1003 | * that it wants x while sender emits packets of smaller size y. | |
1004 | * Therefore the above ...()->partial_cov statement is essential. | |
1005 | */ | |
1006 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
1007 | LIMIT_NETDEBUG(KERN_WARNING | |
1008 | "UDPLITE: coverage %d too small, need min %d\n", | |
1009 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
1010 | goto drop; | |
1011 | } | |
1012 | } | |
1013 | ||
759e5d00 HX |
1014 | if (sk->sk_filter) { |
1015 | if (udp_lib_checksum_complete(skb)) | |
ba4e58ec | 1016 | goto drop; |
1da177e4 LT |
1017 | } |
1018 | ||
81aa646c MB |
1019 | if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { |
1020 | /* Note that an ENOMEM error is charged twice */ | |
1021 | if (rc == -ENOMEM) | |
ba4e58ec GR |
1022 | UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag); |
1023 | goto drop; | |
1da177e4 | 1024 | } |
ba4e58ec GR |
1025 | |
1026 | UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); | |
1da177e4 | 1027 | return 0; |
ba4e58ec GR |
1028 | |
1029 | drop: | |
1030 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag); | |
1031 | kfree_skb(skb); | |
1032 | return -1; | |
1da177e4 LT |
1033 | } |
1034 | ||
1035 | /* | |
1036 | * Multicasts and broadcasts go to each listener. | |
1037 | * | |
1038 | * Note: called only from the BH handler context, | |
1039 | * so we don't need to lock the hashes. | |
1040 | */ | |
ba4e58ec GR |
1041 | static int __udp4_lib_mcast_deliver(struct sk_buff *skb, |
1042 | struct udphdr *uh, | |
1043 | __be32 saddr, __be32 daddr, | |
1044 | struct hlist_head udptable[]) | |
1da177e4 | 1045 | { |
df2bc459 | 1046 | struct sock *sk; |
1da177e4 | 1047 | int dif; |
1da177e4 | 1048 | |
6aaf47fa | 1049 | read_lock(&udp_hash_lock); |
df2bc459 DM |
1050 | sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); |
1051 | dif = skb->dev->ifindex; | |
1052 | sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); | |
6aaf47fa | 1053 | if (sk) { |
df2bc459 DM |
1054 | struct sock *sknext = NULL; |
1055 | ||
1da177e4 LT |
1056 | do { |
1057 | struct sk_buff *skb1 = skb; | |
df2bc459 DM |
1058 | |
1059 | sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr, | |
1060 | uh->source, saddr, dif); | |
6516c655 | 1061 | if (sknext) |
1da177e4 LT |
1062 | skb1 = skb_clone(skb, GFP_ATOMIC); |
1063 | ||
6516c655 | 1064 | if (skb1) { |
1da177e4 LT |
1065 | int ret = udp_queue_rcv_skb(sk, skb1); |
1066 | if (ret > 0) | |
df2bc459 DM |
1067 | /* we should probably re-process instead |
1068 | * of dropping packets here. */ | |
1da177e4 LT |
1069 | kfree_skb(skb1); |
1070 | } | |
1071 | sk = sknext; | |
6516c655 | 1072 | } while (sknext); |
1da177e4 LT |
1073 | } else |
1074 | kfree_skb(skb); | |
1075 | read_unlock(&udp_hash_lock); | |
1076 | return 0; | |
1077 | } | |
1078 | ||
1079 | /* Initialize UDP checksum. If exited with zero value (success), | |
1080 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1081 | * Otherwise, csum completion requires chacksumming packet body, | |
1082 | * including udp header and folding it to skb->csum. | |
1083 | */ | |
759e5d00 HX |
1084 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, |
1085 | int proto) | |
1da177e4 | 1086 | { |
eddc9ec5 | 1087 | const struct iphdr *iph; |
759e5d00 HX |
1088 | int err; |
1089 | ||
1090 | UDP_SKB_CB(skb)->partial_cov = 0; | |
1091 | UDP_SKB_CB(skb)->cscov = skb->len; | |
1092 | ||
1093 | if (proto == IPPROTO_UDPLITE) { | |
1094 | err = udplite_checksum_init(skb, uh); | |
1095 | if (err) | |
1096 | return err; | |
1097 | } | |
1098 | ||
eddc9ec5 | 1099 | iph = ip_hdr(skb); |
1da177e4 LT |
1100 | if (uh->check == 0) { |
1101 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
84fa7933 | 1102 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { |
eddc9ec5 ACM |
1103 | if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
1104 | proto, skb->csum)) | |
fb286bb2 | 1105 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 | 1106 | } |
60476372 | 1107 | if (!skb_csum_unnecessary(skb)) |
eddc9ec5 | 1108 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, |
759e5d00 | 1109 | skb->len, proto, 0); |
1da177e4 LT |
1110 | /* Probably, we should checksum udp header (it should be in cache |
1111 | * in any case) and data in tiny packets (< rx copybreak). | |
1112 | */ | |
ba4e58ec | 1113 | |
759e5d00 | 1114 | return 0; |
1da177e4 LT |
1115 | } |
1116 | ||
1117 | /* | |
e905a9ed | 1118 | * All we need to do is get the socket, and then do a checksum. |
1da177e4 | 1119 | */ |
e905a9ed | 1120 | |
ba4e58ec | 1121 | int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], |
759e5d00 | 1122 | int proto) |
1da177e4 | 1123 | { |
e905a9ed | 1124 | struct sock *sk; |
4bedb452 | 1125 | struct udphdr *uh = udp_hdr(skb); |
1da177e4 LT |
1126 | unsigned short ulen; |
1127 | struct rtable *rt = (struct rtable*)skb->dst; | |
eddc9ec5 ACM |
1128 | __be32 saddr = ip_hdr(skb)->saddr; |
1129 | __be32 daddr = ip_hdr(skb)->daddr; | |
1da177e4 LT |
1130 | |
1131 | /* | |
ba4e58ec | 1132 | * Validate the packet. |
1da177e4 LT |
1133 | */ |
1134 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
ba4e58ec | 1135 | goto drop; /* No space for header. */ |
1da177e4 LT |
1136 | |
1137 | ulen = ntohs(uh->len); | |
ba4e58ec | 1138 | if (ulen > skb->len) |
1da177e4 LT |
1139 | goto short_packet; |
1140 | ||
759e5d00 HX |
1141 | if (proto == IPPROTO_UDP) { |
1142 | /* UDP validates ulen. */ | |
ba4e58ec GR |
1143 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) |
1144 | goto short_packet; | |
4bedb452 | 1145 | uh = udp_hdr(skb); |
ba4e58ec | 1146 | } |
1da177e4 | 1147 | |
759e5d00 HX |
1148 | if (udp4_csum_init(skb, uh, proto)) |
1149 | goto csum_error; | |
1150 | ||
6516c655 | 1151 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
ba4e58ec | 1152 | return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable); |
1da177e4 | 1153 | |
ba4e58ec | 1154 | sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest, |
fee9dee7 | 1155 | inet_iif(skb), udptable); |
1da177e4 LT |
1156 | |
1157 | if (sk != NULL) { | |
1158 | int ret = udp_queue_rcv_skb(sk, skb); | |
1159 | sock_put(sk); | |
1160 | ||
1161 | /* a return value > 0 means to resubmit the input, but | |
ba4e58ec | 1162 | * it wants the return to be -protocol, or 0 |
1da177e4 LT |
1163 | */ |
1164 | if (ret > 0) | |
1165 | return -ret; | |
1166 | return 0; | |
1167 | } | |
1168 | ||
1169 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1170 | goto drop; | |
b59c2701 | 1171 | nf_reset(skb); |
1da177e4 LT |
1172 | |
1173 | /* No socket. Drop packet silently, if checksum is wrong */ | |
ba4e58ec | 1174 | if (udp_lib_checksum_complete(skb)) |
1da177e4 LT |
1175 | goto csum_error; |
1176 | ||
759e5d00 | 1177 | UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
1da177e4 LT |
1178 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1179 | ||
1180 | /* | |
1181 | * Hmm. We got an UDP packet to a port to which we | |
1182 | * don't wanna listen. Ignore it. | |
1183 | */ | |
1184 | kfree_skb(skb); | |
6516c655 | 1185 | return 0; |
1da177e4 LT |
1186 | |
1187 | short_packet: | |
ba4e58ec | 1188 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n", |
759e5d00 | 1189 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
64ce2073 PM |
1190 | NIPQUAD(saddr), |
1191 | ntohs(uh->source), | |
1192 | ulen, | |
ba4e58ec | 1193 | skb->len, |
64ce2073 PM |
1194 | NIPQUAD(daddr), |
1195 | ntohs(uh->dest)); | |
ba4e58ec | 1196 | goto drop; |
1da177e4 LT |
1197 | |
1198 | csum_error: | |
e905a9ed YH |
1199 | /* |
1200 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1201 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1da177e4 | 1202 | */ |
ba4e58ec | 1203 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n", |
759e5d00 | 1204 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
64ce2073 PM |
1205 | NIPQUAD(saddr), |
1206 | ntohs(uh->source), | |
1207 | NIPQUAD(daddr), | |
1208 | ntohs(uh->dest), | |
1209 | ulen); | |
1da177e4 | 1210 | drop: |
759e5d00 | 1211 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 1212 | kfree_skb(skb); |
6516c655 | 1213 | return 0; |
1da177e4 LT |
1214 | } |
1215 | ||
3fbe070a | 1216 | int udp_rcv(struct sk_buff *skb) |
ba4e58ec | 1217 | { |
759e5d00 | 1218 | return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP); |
ba4e58ec GR |
1219 | } |
1220 | ||
1221 | int udp_destroy_sock(struct sock *sk) | |
1da177e4 LT |
1222 | { |
1223 | lock_sock(sk); | |
1224 | udp_flush_pending_frames(sk); | |
1225 | release_sock(sk); | |
1226 | return 0; | |
1227 | } | |
1228 | ||
1229 | /* | |
1230 | * Socket option code for UDP | |
1231 | */ | |
4c0a6cb0 GR |
1232 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
1233 | char __user *optval, int optlen, | |
1234 | int (*push_pending_frames)(struct sock *)) | |
1da177e4 LT |
1235 | { |
1236 | struct udp_sock *up = udp_sk(sk); | |
1237 | int val; | |
1238 | int err = 0; | |
1239 | ||
6516c655 | 1240 | if (optlen<sizeof(int)) |
1da177e4 LT |
1241 | return -EINVAL; |
1242 | ||
1243 | if (get_user(val, (int __user *)optval)) | |
1244 | return -EFAULT; | |
1245 | ||
6516c655 | 1246 | switch (optname) { |
1da177e4 LT |
1247 | case UDP_CORK: |
1248 | if (val != 0) { | |
1249 | up->corkflag = 1; | |
1250 | } else { | |
1251 | up->corkflag = 0; | |
1252 | lock_sock(sk); | |
4c0a6cb0 | 1253 | (*push_pending_frames)(sk); |
1da177e4 LT |
1254 | release_sock(sk); |
1255 | } | |
1256 | break; | |
e905a9ed | 1257 | |
1da177e4 LT |
1258 | case UDP_ENCAP: |
1259 | switch (val) { | |
1260 | case 0: | |
1261 | case UDP_ENCAP_ESPINUDP: | |
1262 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
1263 | up->encap_rcv = xfrm4_udp_encap_rcv; |
1264 | /* FALLTHROUGH */ | |
342f0234 | 1265 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 LT |
1266 | up->encap_type = val; |
1267 | break; | |
1268 | default: | |
1269 | err = -ENOPROTOOPT; | |
1270 | break; | |
1271 | } | |
1272 | break; | |
1273 | ||
ba4e58ec GR |
1274 | /* |
1275 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
1276 | */ | |
1277 | /* The sender sets actual checksum coverage length via this option. | |
1278 | * The case coverage > packet length is handled by send module. */ | |
1279 | case UDPLITE_SEND_CSCOV: | |
1280 | if (!up->pcflag) /* Disable the option on UDP sockets */ | |
1281 | return -ENOPROTOOPT; | |
1282 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
1283 | val = 8; | |
1284 | up->pcslen = val; | |
1285 | up->pcflag |= UDPLITE_SEND_CC; | |
1286 | break; | |
1287 | ||
e905a9ed YH |
1288 | /* The receiver specifies a minimum checksum coverage value. To make |
1289 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
1290 | * used, this again means full checksum coverage. */ |
1291 | case UDPLITE_RECV_CSCOV: | |
1292 | if (!up->pcflag) /* Disable the option on UDP sockets */ | |
1293 | return -ENOPROTOOPT; | |
1294 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
1295 | val = 8; | |
1296 | up->pcrlen = val; | |
1297 | up->pcflag |= UDPLITE_RECV_CC; | |
1298 | break; | |
1299 | ||
1da177e4 LT |
1300 | default: |
1301 | err = -ENOPROTOOPT; | |
1302 | break; | |
6516c655 | 1303 | } |
1da177e4 LT |
1304 | |
1305 | return err; | |
1306 | } | |
1307 | ||
ba4e58ec GR |
1308 | int udp_setsockopt(struct sock *sk, int level, int optname, |
1309 | char __user *optval, int optlen) | |
3fdadf7d | 1310 | { |
ba4e58ec | 1311 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1312 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1313 | udp_push_pending_frames); | |
ba4e58ec | 1314 | return ip_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1315 | } |
1316 | ||
1317 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1318 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, |
1319 | char __user *optval, int optlen) | |
3fdadf7d | 1320 | { |
ba4e58ec | 1321 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1322 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1323 | udp_push_pending_frames); | |
ba4e58ec | 1324 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1325 | } |
1326 | #endif | |
1327 | ||
4c0a6cb0 GR |
1328 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
1329 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
1330 | { |
1331 | struct udp_sock *up = udp_sk(sk); | |
1332 | int val, len; | |
1333 | ||
6516c655 | 1334 | if (get_user(len,optlen)) |
1da177e4 LT |
1335 | return -EFAULT; |
1336 | ||
1337 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 1338 | |
6516c655 | 1339 | if (len < 0) |
1da177e4 LT |
1340 | return -EINVAL; |
1341 | ||
6516c655 | 1342 | switch (optname) { |
1da177e4 LT |
1343 | case UDP_CORK: |
1344 | val = up->corkflag; | |
1345 | break; | |
1346 | ||
1347 | case UDP_ENCAP: | |
1348 | val = up->encap_type; | |
1349 | break; | |
1350 | ||
ba4e58ec GR |
1351 | /* The following two cannot be changed on UDP sockets, the return is |
1352 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
1353 | case UDPLITE_SEND_CSCOV: | |
1354 | val = up->pcslen; | |
1355 | break; | |
1356 | ||
1357 | case UDPLITE_RECV_CSCOV: | |
1358 | val = up->pcrlen; | |
1359 | break; | |
1360 | ||
1da177e4 LT |
1361 | default: |
1362 | return -ENOPROTOOPT; | |
6516c655 | 1363 | } |
1da177e4 | 1364 | |
6516c655 | 1365 | if (put_user(len, optlen)) |
e905a9ed | 1366 | return -EFAULT; |
6516c655 | 1367 | if (copy_to_user(optval, &val,len)) |
1da177e4 | 1368 | return -EFAULT; |
e905a9ed | 1369 | return 0; |
1da177e4 LT |
1370 | } |
1371 | ||
ba4e58ec GR |
1372 | int udp_getsockopt(struct sock *sk, int level, int optname, |
1373 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1374 | { |
ba4e58ec | 1375 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1376 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1377 | return ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1378 | } |
1379 | ||
1380 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1381 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, |
543d9cfe | 1382 | char __user *optval, int __user *optlen) |
3fdadf7d | 1383 | { |
ba4e58ec | 1384 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1385 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1386 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1387 | } |
1388 | #endif | |
1da177e4 LT |
1389 | /** |
1390 | * udp_poll - wait for a UDP event. | |
1391 | * @file - file struct | |
1392 | * @sock - socket | |
1393 | * @wait - poll table | |
1394 | * | |
e905a9ed | 1395 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
1396 | * blocking sockets. If application is using a blocking fd |
1397 | * and a packet with checksum error is in the queue; | |
1398 | * then it could get return from select indicating data available | |
1399 | * but then block when reading it. Add special case code | |
1400 | * to work around these arguably broken applications. | |
1401 | */ | |
1402 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
1403 | { | |
1404 | unsigned int mask = datagram_poll(file, sock, wait); | |
1405 | struct sock *sk = sock->sk; | |
ba4e58ec GR |
1406 | int is_lite = IS_UDPLITE(sk); |
1407 | ||
1da177e4 LT |
1408 | /* Check for false positives due to checksum errors */ |
1409 | if ( (mask & POLLRDNORM) && | |
1410 | !(file->f_flags & O_NONBLOCK) && | |
1411 | !(sk->sk_shutdown & RCV_SHUTDOWN)){ | |
1412 | struct sk_buff_head *rcvq = &sk->sk_receive_queue; | |
1413 | struct sk_buff *skb; | |
1414 | ||
208d8984 | 1415 | spin_lock_bh(&rcvq->lock); |
759e5d00 HX |
1416 | while ((skb = skb_peek(rcvq)) != NULL && |
1417 | udp_lib_checksum_complete(skb)) { | |
1418 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_lite); | |
1419 | __skb_unlink(skb, rcvq); | |
1420 | kfree_skb(skb); | |
1da177e4 | 1421 | } |
208d8984 | 1422 | spin_unlock_bh(&rcvq->lock); |
1da177e4 LT |
1423 | |
1424 | /* nothing to see, move along */ | |
1425 | if (skb == NULL) | |
1426 | mask &= ~(POLLIN | POLLRDNORM); | |
1427 | } | |
1428 | ||
1429 | return mask; | |
e905a9ed | 1430 | |
1da177e4 LT |
1431 | } |
1432 | ||
47a31a6f ED |
1433 | DEFINE_PROTO_INUSE(udp) |
1434 | ||
1da177e4 | 1435 | struct proto udp_prot = { |
e905a9ed | 1436 | .name = "UDP", |
543d9cfe | 1437 | .owner = THIS_MODULE, |
ba4e58ec | 1438 | .close = udp_lib_close, |
543d9cfe ACM |
1439 | .connect = ip4_datagram_connect, |
1440 | .disconnect = udp_disconnect, | |
1441 | .ioctl = udp_ioctl, | |
1442 | .destroy = udp_destroy_sock, | |
1443 | .setsockopt = udp_setsockopt, | |
1444 | .getsockopt = udp_getsockopt, | |
1445 | .sendmsg = udp_sendmsg, | |
1446 | .recvmsg = udp_recvmsg, | |
1447 | .sendpage = udp_sendpage, | |
1448 | .backlog_rcv = udp_queue_rcv_skb, | |
ba4e58ec GR |
1449 | .hash = udp_lib_hash, |
1450 | .unhash = udp_lib_unhash, | |
543d9cfe ACM |
1451 | .get_port = udp_v4_get_port, |
1452 | .obj_size = sizeof(struct udp_sock), | |
3fdadf7d | 1453 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1454 | .compat_setsockopt = compat_udp_setsockopt, |
1455 | .compat_getsockopt = compat_udp_getsockopt, | |
3fdadf7d | 1456 | #endif |
47a31a6f | 1457 | REF_PROTO_INUSE(udp) |
1da177e4 LT |
1458 | }; |
1459 | ||
1460 | /* ------------------------------------------------------------------------ */ | |
1461 | #ifdef CONFIG_PROC_FS | |
1462 | ||
1463 | static struct sock *udp_get_first(struct seq_file *seq) | |
1464 | { | |
1465 | struct sock *sk; | |
1466 | struct udp_iter_state *state = seq->private; | |
1467 | ||
1468 | for (state->bucket = 0; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) { | |
1469 | struct hlist_node *node; | |
ba4e58ec | 1470 | sk_for_each(sk, node, state->hashtable + state->bucket) { |
1da177e4 LT |
1471 | if (sk->sk_family == state->family) |
1472 | goto found; | |
1473 | } | |
1474 | } | |
1475 | sk = NULL; | |
1476 | found: | |
1477 | return sk; | |
1478 | } | |
1479 | ||
1480 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
1481 | { | |
1482 | struct udp_iter_state *state = seq->private; | |
1483 | ||
1484 | do { | |
1485 | sk = sk_next(sk); | |
1486 | try_again: | |
1487 | ; | |
1488 | } while (sk && sk->sk_family != state->family); | |
1489 | ||
1490 | if (!sk && ++state->bucket < UDP_HTABLE_SIZE) { | |
ba4e58ec | 1491 | sk = sk_head(state->hashtable + state->bucket); |
1da177e4 LT |
1492 | goto try_again; |
1493 | } | |
1494 | return sk; | |
1495 | } | |
1496 | ||
1497 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
1498 | { | |
1499 | struct sock *sk = udp_get_first(seq); | |
1500 | ||
1501 | if (sk) | |
6516c655 | 1502 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
1503 | --pos; |
1504 | return pos ? NULL : sk; | |
1505 | } | |
1506 | ||
1507 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
1508 | { | |
1509 | read_lock(&udp_hash_lock); | |
1510 | return *pos ? udp_get_idx(seq, *pos-1) : (void *)1; | |
1511 | } | |
1512 | ||
1513 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1514 | { | |
1515 | struct sock *sk; | |
1516 | ||
1517 | if (v == (void *)1) | |
1518 | sk = udp_get_idx(seq, 0); | |
1519 | else | |
1520 | sk = udp_get_next(seq, v); | |
1521 | ||
1522 | ++*pos; | |
1523 | return sk; | |
1524 | } | |
1525 | ||
1526 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
1527 | { | |
1528 | read_unlock(&udp_hash_lock); | |
1529 | } | |
1530 | ||
1531 | static int udp_seq_open(struct inode *inode, struct file *file) | |
1532 | { | |
1533 | struct udp_seq_afinfo *afinfo = PDE(inode)->data; | |
1534 | struct seq_file *seq; | |
1535 | int rc = -ENOMEM; | |
0da974f4 | 1536 | struct udp_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
1537 | |
1538 | if (!s) | |
1539 | goto out; | |
1da177e4 | 1540 | s->family = afinfo->family; |
ba4e58ec | 1541 | s->hashtable = afinfo->hashtable; |
1da177e4 LT |
1542 | s->seq_ops.start = udp_seq_start; |
1543 | s->seq_ops.next = udp_seq_next; | |
1544 | s->seq_ops.show = afinfo->seq_show; | |
1545 | s->seq_ops.stop = udp_seq_stop; | |
1546 | ||
1547 | rc = seq_open(file, &s->seq_ops); | |
1548 | if (rc) | |
1549 | goto out_kfree; | |
1550 | ||
1551 | seq = file->private_data; | |
1552 | seq->private = s; | |
1553 | out: | |
1554 | return rc; | |
1555 | out_kfree: | |
1556 | kfree(s); | |
1557 | goto out; | |
1558 | } | |
1559 | ||
1560 | /* ------------------------------------------------------------------------ */ | |
1561 | int udp_proc_register(struct udp_seq_afinfo *afinfo) | |
1562 | { | |
1563 | struct proc_dir_entry *p; | |
1564 | int rc = 0; | |
1565 | ||
1566 | if (!afinfo) | |
1567 | return -EINVAL; | |
1568 | afinfo->seq_fops->owner = afinfo->owner; | |
1569 | afinfo->seq_fops->open = udp_seq_open; | |
1570 | afinfo->seq_fops->read = seq_read; | |
1571 | afinfo->seq_fops->llseek = seq_lseek; | |
1572 | afinfo->seq_fops->release = seq_release_private; | |
1573 | ||
457c4cbc | 1574 | p = proc_net_fops_create(&init_net, afinfo->name, S_IRUGO, afinfo->seq_fops); |
1da177e4 LT |
1575 | if (p) |
1576 | p->data = afinfo; | |
1577 | else | |
1578 | rc = -ENOMEM; | |
1579 | return rc; | |
1580 | } | |
1581 | ||
1582 | void udp_proc_unregister(struct udp_seq_afinfo *afinfo) | |
1583 | { | |
1584 | if (!afinfo) | |
1585 | return; | |
457c4cbc | 1586 | proc_net_remove(&init_net, afinfo->name); |
1da177e4 LT |
1587 | memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops)); |
1588 | } | |
1589 | ||
1590 | /* ------------------------------------------------------------------------ */ | |
1591 | static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket) | |
1592 | { | |
1593 | struct inet_sock *inet = inet_sk(sp); | |
734ab87f AV |
1594 | __be32 dest = inet->daddr; |
1595 | __be32 src = inet->rcv_saddr; | |
1da177e4 LT |
1596 | __u16 destp = ntohs(inet->dport); |
1597 | __u16 srcp = ntohs(inet->sport); | |
1598 | ||
1599 | sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X" | |
1600 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p", | |
e905a9ed | 1601 | bucket, src, srcp, dest, destp, sp->sk_state, |
1da177e4 LT |
1602 | atomic_read(&sp->sk_wmem_alloc), |
1603 | atomic_read(&sp->sk_rmem_alloc), | |
1604 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), | |
1605 | atomic_read(&sp->sk_refcnt), sp); | |
1606 | } | |
1607 | ||
ba4e58ec | 1608 | int udp4_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1609 | { |
1610 | if (v == SEQ_START_TOKEN) | |
1611 | seq_printf(seq, "%-127s\n", | |
1612 | " sl local_address rem_address st tx_queue " | |
1613 | "rx_queue tr tm->when retrnsmt uid timeout " | |
1614 | "inode"); | |
1615 | else { | |
1616 | char tmpbuf[129]; | |
1617 | struct udp_iter_state *state = seq->private; | |
1618 | ||
1619 | udp4_format_sock(v, tmpbuf, state->bucket); | |
1620 | seq_printf(seq, "%-127s\n", tmpbuf); | |
1621 | } | |
1622 | return 0; | |
1623 | } | |
1624 | ||
1625 | /* ------------------------------------------------------------------------ */ | |
1626 | static struct file_operations udp4_seq_fops; | |
1627 | static struct udp_seq_afinfo udp4_seq_afinfo = { | |
1628 | .owner = THIS_MODULE, | |
1629 | .name = "udp", | |
1630 | .family = AF_INET, | |
ba4e58ec | 1631 | .hashtable = udp_hash, |
1da177e4 LT |
1632 | .seq_show = udp4_seq_show, |
1633 | .seq_fops = &udp4_seq_fops, | |
1634 | }; | |
1635 | ||
1636 | int __init udp4_proc_init(void) | |
1637 | { | |
1638 | return udp_proc_register(&udp4_seq_afinfo); | |
1639 | } | |
1640 | ||
1641 | void udp4_proc_exit(void) | |
1642 | { | |
1643 | udp_proc_unregister(&udp4_seq_afinfo); | |
1644 | } | |
1645 | #endif /* CONFIG_PROC_FS */ | |
1646 | ||
1647 | EXPORT_SYMBOL(udp_disconnect); | |
1648 | EXPORT_SYMBOL(udp_hash); | |
1649 | EXPORT_SYMBOL(udp_hash_lock); | |
1650 | EXPORT_SYMBOL(udp_ioctl); | |
25030a7f | 1651 | EXPORT_SYMBOL(udp_get_port); |
1da177e4 LT |
1652 | EXPORT_SYMBOL(udp_prot); |
1653 | EXPORT_SYMBOL(udp_sendmsg); | |
4c0a6cb0 GR |
1654 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1655 | EXPORT_SYMBOL(udp_lib_setsockopt); | |
1da177e4 LT |
1656 | EXPORT_SYMBOL(udp_poll); |
1657 | ||
1658 | #ifdef CONFIG_PROC_FS | |
1659 | EXPORT_SYMBOL(udp_proc_register); | |
1660 | EXPORT_SYMBOL(udp_proc_unregister); | |
1661 | #endif |