Commit | Line | Data |
---|---|---|
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 | |
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 | */ | |
e905a9ed | 80 | |
1da177e4 LT |
81 | #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> | |
14c85021 | 89 | #include <linux/igmp.h> |
1da177e4 LT |
90 | #include <linux/in.h> |
91 | #include <linux/errno.h> | |
92 | #include <linux/timer.h> | |
93 | #include <linux/mm.h> | |
1da177e4 | 94 | #include <linux/inet.h> |
1da177e4 | 95 | #include <linux/netdevice.h> |
c752f073 | 96 | #include <net/tcp_states.h> |
1da177e4 LT |
97 | #include <linux/skbuff.h> |
98 | #include <linux/proc_fs.h> | |
99 | #include <linux/seq_file.h> | |
1da177e4 LT |
100 | #include <net/icmp.h> |
101 | #include <net/route.h> | |
1da177e4 LT |
102 | #include <net/checksum.h> |
103 | #include <net/xfrm.h> | |
ba4e58ec | 104 | #include "udp_impl.h" |
1da177e4 LT |
105 | |
106 | /* | |
107 | * Snmp MIB for the UDP layer | |
108 | */ | |
109 | ||
ba89966c | 110 | DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly; |
1da177e4 LT |
111 | |
112 | struct hlist_head udp_hash[UDP_HTABLE_SIZE]; | |
113 | DEFINE_RWLOCK(udp_hash_lock); | |
114 | ||
bed53ea7 | 115 | static int udp_port_rover; |
1da177e4 | 116 | |
8e5200f5 | 117 | static inline int __udp_lib_lport_inuse(__u16 num, struct hlist_head udptable[]) |
1da177e4 | 118 | { |
25030a7f | 119 | struct sock *sk; |
1da177e4 | 120 | struct hlist_node *node; |
25030a7f | 121 | |
ba4e58ec | 122 | sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)]) |
95f30b33 | 123 | if (sk->sk_hash == num) |
25030a7f GR |
124 | return 1; |
125 | return 0; | |
126 | } | |
127 | ||
128 | /** | |
ba4e58ec | 129 | * __udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
130 | * |
131 | * @sk: socket struct in question | |
132 | * @snum: port number to look up | |
ba4e58ec GR |
133 | * @udptable: hash list table, must be of UDP_HTABLE_SIZE |
134 | * @port_rover: pointer to record of last unallocated port | |
25030a7f GR |
135 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
136 | */ | |
ba4e58ec GR |
137 | int __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 ) ) | |
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); | |
148 | if (snum == 0) { | |
149 | int best_size_so_far, best, result, i; | |
150 | ||
ba4e58ec GR |
151 | if (*port_rover > sysctl_local_port_range[1] || |
152 | *port_rover < sysctl_local_port_range[0]) | |
153 | *port_rover = sysctl_local_port_range[0]; | |
1da177e4 | 154 | best_size_so_far = 32767; |
ba4e58ec | 155 | best = result = *port_rover; |
1da177e4 | 156 | for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) { |
1da177e4 LT |
157 | int size; |
158 | ||
ba4e58ec | 159 | head = &udptable[result & (UDP_HTABLE_SIZE - 1)]; |
25030a7f | 160 | if (hlist_empty(head)) { |
1da177e4 LT |
161 | 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; | |
5c668704 DM |
168 | 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 | ; | |
1da177e4 LT |
176 | } |
177 | result = best; | |
6516c655 SH |
178 | for (i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; |
179 | i++, result += UDP_HTABLE_SIZE) { | |
1da177e4 LT |
180 | 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)); | |
ba4e58ec | 184 | if (! __udp_lib_lport_inuse(result, udptable)) |
1da177e4 LT |
185 | break; |
186 | } | |
187 | if (i >= (1 << 16) / UDP_HTABLE_SIZE) | |
188 | goto fail; | |
189 | gotit: | |
ba4e58ec | 190 | *port_rover = snum = result; |
1da177e4 | 191 | } else { |
ba4e58ec | 192 | head = &udptable[snum & (UDP_HTABLE_SIZE - 1)]; |
25030a7f GR |
193 | |
194 | sk_for_each(sk2, node, head) | |
95f30b33 | 195 | if (sk2->sk_hash == snum && |
25030a7f GR |
196 | 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) && | |
ba4e58ec | 200 | (*saddr_comp)(sk, sk2) ) |
1da177e4 | 201 | goto fail; |
1da177e4 | 202 | } |
25030a7f | 203 | inet_sk(sk)->num = snum; |
95f30b33 | 204 | sk->sk_hash = snum; |
1da177e4 | 205 | if (sk_unhashed(sk)) { |
ba4e58ec | 206 | head = &udptable[snum & (UDP_HTABLE_SIZE - 1)]; |
25030a7f | 207 | sk_add_node(sk, head); |
1da177e4 LT |
208 | sock_prot_inc_use(sk->sk_prot); |
209 | } | |
25030a7f | 210 | error = 0; |
1da177e4 LT |
211 | fail: |
212 | write_unlock_bh(&udp_hash_lock); | |
25030a7f GR |
213 | return error; |
214 | } | |
215 | ||
ba4e58ec GR |
216 | __inline__ int udp_get_port(struct sock *sk, unsigned short snum, |
217 | 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 | ||
222 | inline int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) | |
25030a7f GR |
223 | { |
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 | ||
231 | static inline int udp_v4_get_port(struct sock *sk, unsigned short snum) | |
232 | { | |
233 | return udp_get_port(sk, snum, ipv4_rcv_saddr_equal); | |
1da177e4 LT |
234 | } |
235 | ||
1da177e4 LT |
236 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
237 | * harder than this. -DaveM | |
238 | */ | |
ba4e58ec GR |
239 | static struct sock *__udp4_lib_lookup(__be32 saddr, __be16 sport, |
240 | __be32 daddr, __be16 dport, | |
241 | int dif, struct hlist_head udptable[]) | |
1da177e4 LT |
242 | { |
243 | struct sock *sk, *result = NULL; | |
244 | struct hlist_node *node; | |
245 | unsigned short hnum = ntohs(dport); | |
246 | int badness = -1; | |
247 | ||
ba4e58ec GR |
248 | read_lock(&udp_hash_lock); |
249 | sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) { | |
1da177e4 LT |
250 | struct inet_sock *inet = inet_sk(sk); |
251 | ||
95f30b33 | 252 | if (sk->sk_hash == hnum && !ipv6_only_sock(sk)) { |
1da177e4 LT |
253 | 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 | } | |
6516c655 | 274 | if (score == 9) { |
1da177e4 LT |
275 | result = sk; |
276 | break; | |
6516c655 | 277 | } else if (score > badness) { |
1da177e4 LT |
278 | result = sk; |
279 | badness = score; | |
280 | } | |
281 | } | |
282 | } | |
ba4e58ec GR |
283 | if (result) |
284 | sock_hold(result); | |
1da177e4 | 285 | read_unlock(&udp_hash_lock); |
ba4e58ec | 286 | return result; |
1da177e4 LT |
287 | } |
288 | ||
289 | static inline struct sock *udp_v4_mcast_next(struct sock *sk, | |
734ab87f AV |
290 | __be16 loc_port, __be32 loc_addr, |
291 | __be16 rmt_port, __be32 rmt_addr, | |
1da177e4 LT |
292 | 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 | ||
95f30b33 | 301 | if (s->sk_hash != hnum || |
1da177e4 LT |
302 | (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; | |
e905a9ed | 311 | } |
1da177e4 LT |
312 | s = NULL; |
313 | found: | |
e905a9ed | 314 | return s; |
1da177e4 LT |
315 | } |
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 | |
e905a9ed | 321 | * it's just the icmp type << 8 | icmp code. |
1da177e4 LT |
322 | * 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 | ||
ba4e58ec | 328 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[]) |
1da177e4 LT |
329 | { |
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 | ||
ba4e58ec GR |
339 | sk = __udp4_lib_lookup(iph->daddr, uh->dest, iph->saddr, uh->source, |
340 | skb->dev->ifindex, udptable ); | |
1da177e4 LT |
341 | if (sk == NULL) { |
342 | ICMP_INC_STATS_BH(ICMP_MIB_INERRORS); | |
e905a9ed | 343 | return; /* No socket for error */ |
1da177e4 LT |
344 | } |
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 | /* | |
e905a9ed | 379 | * RFC1122: OK. Passes ICMP errors back to application, as per |
1da177e4 LT |
380 | * 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); | |
390 | out: | |
391 | sock_put(sk); | |
392 | } | |
393 | ||
ba4e58ec GR |
394 | __inline__ void udp_err(struct sk_buff *skb, u32 info) |
395 | { | |
396 | return __udp4_lib_err(skb, info, udp_hash); | |
397 | } | |
398 | ||
1da177e4 LT |
399 | /* |
400 | * Throw away all pending data and cancel the corking. Socket is locked. | |
401 | */ | |
402 | static 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 | ||
ba4e58ec GR |
413 | /** |
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 | */ | |
419 | static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
420 | __be32 src, __be32 dst, int len ) | |
421 | { | |
6b11687e | 422 | unsigned int offset; |
ba4e58ec | 423 | struct udphdr *uh = skb->h.uh; |
6b11687e | 424 | __wsum csum = 0; |
ba4e58ec GR |
425 | |
426 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
427 | /* | |
428 | * Only one fragment on the socket. | |
429 | */ | |
ff1dcadb | 430 | skb->csum_offset = offsetof(struct udphdr, check); |
ba4e58ec GR |
431 | 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) | |
f6ab0288 | 449 | uh->check = CSUM_MANGLED_0; |
ba4e58ec GR |
450 | } |
451 | } | |
452 | ||
1da177e4 LT |
453 | /* |
454 | * Push out all pending data as one UDP datagram. Socket is locked. | |
455 | */ | |
4c0a6cb0 | 456 | static int udp_push_pending_frames(struct sock *sk) |
1da177e4 | 457 | { |
4c0a6cb0 | 458 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
459 | 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; | |
8e5200f5 | 464 | __wsum csum = 0; |
1da177e4 LT |
465 | |
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 | ||
ba4e58ec GR |
479 | 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 | ||
1da177e4 LT |
484 | skb->ip_summed = CHECKSUM_NONE; |
485 | goto send; | |
1da177e4 | 486 | |
ba4e58ec | 487 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
1da177e4 | 488 | |
ba4e58ec GR |
489 | udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len); |
490 | goto send; | |
491 | ||
492 | } 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) | |
f6ab0288 | 499 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 500 | |
1da177e4 LT |
501 | send: |
502 | err = ip_push_pending_frames(sk); | |
503 | out: | |
504 | up->len = 0; | |
505 | up->pending = 0; | |
506 | return err; | |
507 | } | |
508 | ||
1da177e4 LT |
509 | int 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; | |
3ca3c68e | 519 | __be32 daddr, faddr, saddr; |
734ab87f | 520 | __be16 dport; |
1da177e4 | 521 | u8 tos; |
ba4e58ec | 522 | int err, is_udplite = up->pcflag; |
1da177e4 | 523 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
ba4e58ec | 524 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
525 | |
526 | if (len > 0xFFFF) | |
527 | return -EMSGSIZE; | |
528 | ||
e905a9ed | 529 | /* |
1da177e4 LT |
530 | * 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. | |
e905a9ed | 541 | * The socket lock must be held while it's corked. |
1da177e4 LT |
542 | */ |
543 | lock_sock(sk); | |
544 | if (likely(up->pending)) { | |
545 | if (unlikely(up->pending != AF_INET)) { | |
546 | release_sock(sk); | |
547 | return -EINVAL; | |
548 | } | |
e905a9ed | 549 | goto do_append_data; |
1da177e4 LT |
550 | } |
551 | release_sock(sk); | |
552 | } | |
553 | ulen += sizeof(struct udphdr); | |
554 | ||
555 | /* | |
e905a9ed | 556 | * Get and verify the address. |
1da177e4 LT |
557 | */ |
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; | |
e905a9ed | 580 | } |
1da177e4 LT |
581 | 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) || | |
e905a9ed | 606 | (msg->msg_flags & MSG_DONTROUTE) || |
1da177e4 LT |
607 | (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 } }, | |
ba4e58ec | 629 | .proto = sk->sk_protocol, |
1da177e4 LT |
630 | .uli_u = { .ports = |
631 | { .sport = inet->sport, | |
632 | .dport = dport } } }; | |
beb8d13b | 633 | security_sk_classify_flow(sk, &fl); |
8eb9086f | 634 | err = ip_route_output_flow(&rt, &fl, sk, 1); |
1da177e4 LT |
635 | 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; | |
648 | back_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 | ||
64ce2073 | 660 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
661 | 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 | ||
673 | do_append_data: | |
674 | up->len += ulen; | |
ba4e58ec GR |
675 | 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, | |
1da177e4 LT |
678 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
679 | if (err) | |
680 | udp_flush_pending_frames(sk); | |
681 | else if (!corkreq) | |
4c0a6cb0 | 682 | err = udp_push_pending_frames(sk); |
1e0c14f4 HX |
683 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
684 | up->pending = 0; | |
1da177e4 LT |
685 | release_sock(sk); |
686 | ||
687 | out: | |
688 | ip_rt_put(rt); | |
689 | if (free) | |
690 | kfree(ipc.opt); | |
691 | if (!err) { | |
ba4e58ec | 692 | UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); |
1da177e4 LT |
693 | return len; |
694 | } | |
81aa646c MB |
695 | /* |
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)) { | |
ba4e58ec | 703 | UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); |
81aa646c | 704 | } |
1da177e4 LT |
705 | return err; |
706 | ||
707 | do_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 | ||
ba4e58ec GR |
715 | int udp_sendpage(struct sock *sk, struct page *page, int offset, |
716 | size_t size, int flags) | |
1da177e4 LT |
717 | { |
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 | ||
64ce2073 | 738 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n"); |
1da177e4 LT |
739 | 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))) | |
4c0a6cb0 | 755 | ret = udp_push_pending_frames(sk); |
1da177e4 LT |
756 | if (!ret) |
757 | ret = size; | |
758 | out: | |
759 | release_sock(sk); | |
760 | return ret; | |
761 | } | |
762 | ||
763 | /* | |
764 | * IOCTL requests applicable to the UDP protocol | |
765 | */ | |
e905a9ed | 766 | |
1da177e4 LT |
767 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
768 | { | |
6516c655 SH |
769 | switch (cmd) { |
770 | case SIOCOUTQ: | |
1da177e4 | 771 | { |
6516c655 SH |
772 | int amount = atomic_read(&sk->sk_wmem_alloc); |
773 | return put_user(amount, (int __user *)arg); | |
774 | } | |
1da177e4 | 775 | |
6516c655 SH |
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); | |
1da177e4 | 791 | } |
6516c655 SH |
792 | spin_unlock_bh(&sk->sk_receive_queue.lock); |
793 | return put_user(amount, (int __user *)arg); | |
794 | } | |
1da177e4 | 795 | |
6516c655 SH |
796 | default: |
797 | return -ENOIOCTLCMD; | |
1da177e4 | 798 | } |
6516c655 SH |
799 | |
800 | return 0; | |
1da177e4 LT |
801 | } |
802 | ||
1da177e4 LT |
803 | /* |
804 | * This should be easy, if there is something there we | |
805 | * return it, otherwise we block. | |
806 | */ | |
807 | ||
ba4e58ec | 808 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
e905a9ed | 809 | size_t len, int noblock, int flags, int *addr_len) |
1da177e4 LT |
810 | { |
811 | struct inet_sock *inet = inet_sk(sk); | |
e905a9ed YH |
812 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; |
813 | struct sk_buff *skb; | |
759e5d00 HX |
814 | unsigned int ulen, copied; |
815 | int err; | |
816 | int is_udplite = IS_UDPLITE(sk); | |
1da177e4 LT |
817 | |
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 | ||
827 | try_again: | |
828 | skb = skb_recv_datagram(sk, flags, noblock, &err); | |
829 | if (!skb) | |
830 | goto out; | |
e905a9ed | 831 | |
759e5d00 HX |
832 | ulen = skb->len - sizeof(struct udphdr); |
833 | copied = len; | |
834 | if (copied > ulen) | |
835 | copied = ulen; | |
836 | else if (copied < ulen) | |
1da177e4 | 837 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 838 | |
ba4e58ec | 839 | /* |
759e5d00 HX |
840 | * 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. | |
ba4e58ec | 843 | */ |
ba4e58ec | 844 | |
759e5d00 HX |
845 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
846 | if (udp_lib_checksum_complete(skb)) | |
1da177e4 | 847 | goto csum_copy_err; |
ba4e58ec GR |
848 | } |
849 | ||
759e5d00 | 850 | if (skb->ip_summed == CHECKSUM_UNNECESSARY) |
ba4e58ec GR |
851 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
852 | msg->msg_iov, copied ); | |
853 | else { | |
1da177e4 LT |
854 | 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)); | |
e905a9ed | 872 | } |
1da177e4 LT |
873 | if (inet->cmsg_flags) |
874 | ip_cmsg_recv(msg, skb); | |
875 | ||
876 | err = copied; | |
877 | if (flags & MSG_TRUNC) | |
759e5d00 | 878 | err = ulen; |
e905a9ed | 879 | |
1da177e4 | 880 | out_free: |
e905a9ed | 881 | skb_free_datagram(sk, skb); |
1da177e4 | 882 | out: |
e905a9ed | 883 | return err; |
1da177e4 LT |
884 | |
885 | csum_copy_err: | |
ba4e58ec | 886 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite); |
1da177e4 | 887 | |
3305b80c | 888 | skb_kill_datagram(sk, skb, flags); |
1da177e4 LT |
889 | |
890 | if (noblock) | |
e905a9ed | 891 | return -EAGAIN; |
1da177e4 LT |
892 | goto try_again; |
893 | } | |
894 | ||
895 | ||
896 | int udp_disconnect(struct sock *sk, int flags) | |
897 | { | |
898 | struct inet_sock *inet = inet_sk(sk); | |
899 | /* | |
900 | * 1003.1g - break association. | |
901 | */ | |
e905a9ed | 902 | |
1da177e4 LT |
903 | 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 | ||
1da177e4 LT |
918 | /* 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 | */ | |
923 | static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb) | |
924 | { | |
925 | #ifndef CONFIG_XFRM | |
e905a9ed | 926 | return 1; |
1da177e4 LT |
927 | #else |
928 | struct udp_sock *up = udp_sk(sk); | |
e905a9ed | 929 | struct udphdr *uh; |
1da177e4 LT |
930 | struct iphdr *iph; |
931 | int iphlen, len; | |
e905a9ed | 932 | |
753eab76 OK |
933 | __u8 *udpdata; |
934 | __be32 *udpdata32; | |
1da177e4 LT |
935 | __u16 encap_type = up->encap_type; |
936 | ||
937 | /* if we're overly short, let UDP handle it */ | |
753eab76 OK |
938 | len = skb->len - sizeof(struct udphdr); |
939 | if (len <= 0) | |
1da177e4 LT |
940 | return 1; |
941 | ||
942 | /* if this is not encapsulated socket, then just return now */ | |
943 | if (!encap_type) | |
944 | return 1; | |
945 | ||
753eab76 OK |
946 | /* 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; | |
1da177e4 LT |
955 | |
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; | |
6516c655 | 962 | } else if (len > sizeof(struct ip_esp_hdr) && udpdata32[0] != 0) { |
1da177e4 LT |
963 | /* 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) { | |
e905a9ed | 975 | |
1da177e4 LT |
976 | /* 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 | */ | |
4d78b6c7 HX |
989 | if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) |
990 | return 0; | |
1da177e4 LT |
991 | |
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 | */ | |
1005 | skb->h.raw = skb_pull(skb, len); | |
1006 | ||
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 | */ | |
ba4e58ec | 1023 | int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) |
1da177e4 LT |
1024 | { |
1025 | struct udp_sock *up = udp_sk(sk); | |
81aa646c | 1026 | int rc; |
1da177e4 LT |
1027 | |
1028 | /* | |
1029 | * Charge it to the socket, dropping if the queue is full. | |
1030 | */ | |
ba4e58ec GR |
1031 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) |
1032 | goto drop; | |
b59c2701 | 1033 | nf_reset(skb); |
1da177e4 LT |
1034 | |
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); | |
ba4e58ec | 1056 | UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); |
1da177e4 LT |
1057 | return -ret; |
1058 | } | |
1059 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1060 | } | |
1061 | ||
ba4e58ec GR |
1062 | /* |
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; | |
1da177e4 | 1083 | } |
ba4e58ec GR |
1084 | /* 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 | ||
759e5d00 HX |
1098 | if (sk->sk_filter) { |
1099 | if (udp_lib_checksum_complete(skb)) | |
ba4e58ec | 1100 | goto drop; |
1da177e4 LT |
1101 | } |
1102 | ||
81aa646c MB |
1103 | if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) { |
1104 | /* Note that an ENOMEM error is charged twice */ | |
1105 | if (rc == -ENOMEM) | |
ba4e58ec GR |
1106 | UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, up->pcflag); |
1107 | goto drop; | |
1da177e4 | 1108 | } |
ba4e58ec GR |
1109 | |
1110 | UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); | |
1da177e4 | 1111 | return 0; |
ba4e58ec GR |
1112 | |
1113 | drop: | |
1114 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag); | |
1115 | kfree_skb(skb); | |
1116 | return -1; | |
1da177e4 LT |
1117 | } |
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 | */ | |
ba4e58ec GR |
1125 | static int __udp4_lib_mcast_deliver(struct sk_buff *skb, |
1126 | struct udphdr *uh, | |
1127 | __be32 saddr, __be32 daddr, | |
1128 | struct hlist_head udptable[]) | |
1da177e4 LT |
1129 | { |
1130 | struct sock *sk; | |
1131 | int dif; | |
1132 | ||
1133 | read_lock(&udp_hash_lock); | |
ba4e58ec | 1134 | sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); |
1da177e4 LT |
1135 | 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); | |
6516c655 | 1145 | if (sknext) |
1da177e4 LT |
1146 | skb1 = skb_clone(skb, GFP_ATOMIC); |
1147 | ||
6516c655 | 1148 | if (skb1) { |
1da177e4 LT |
1149 | int ret = udp_queue_rcv_skb(sk, skb1); |
1150 | if (ret > 0) | |
1151 | /* we should probably re-process instead | |
1152 | * of dropping packets here. */ | |
1153 | kfree_skb(skb1); | |
1154 | } | |
1155 | sk = sknext; | |
6516c655 | 1156 | } while (sknext); |
1da177e4 LT |
1157 | } else |
1158 | kfree_skb(skb); | |
1159 | read_unlock(&udp_hash_lock); | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | /* Initialize UDP checksum. If exited with zero value (success), | |
1164 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1165 | * Otherwise, csum completion requires chacksumming packet body, | |
1166 | * including udp header and folding it to skb->csum. | |
1167 | */ | |
759e5d00 HX |
1168 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, |
1169 | int proto) | |
1da177e4 | 1170 | { |
759e5d00 HX |
1171 | 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 | ||
1da177e4 LT |
1182 | if (uh->check == 0) { |
1183 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
84fa7933 | 1184 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { |
ba4e58ec | 1185 | if (!csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr, |
759e5d00 | 1186 | skb->len, proto, skb->csum)) |
fb286bb2 | 1187 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
1da177e4 LT |
1188 | } |
1189 | if (skb->ip_summed != CHECKSUM_UNNECESSARY) | |
ba4e58ec GR |
1190 | skb->csum = csum_tcpudp_nofold(skb->nh.iph->saddr, |
1191 | skb->nh.iph->daddr, | |
759e5d00 | 1192 | skb->len, proto, 0); |
1da177e4 LT |
1193 | /* Probably, we should checksum udp header (it should be in cache |
1194 | * in any case) and data in tiny packets (< rx copybreak). | |
1195 | */ | |
ba4e58ec | 1196 | |
759e5d00 | 1197 | return 0; |
1da177e4 LT |
1198 | } |
1199 | ||
1200 | /* | |
e905a9ed | 1201 | * All we need to do is get the socket, and then do a checksum. |
1da177e4 | 1202 | */ |
e905a9ed | 1203 | |
ba4e58ec | 1204 | int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], |
759e5d00 | 1205 | int proto) |
1da177e4 | 1206 | { |
e905a9ed YH |
1207 | struct sock *sk; |
1208 | struct udphdr *uh = skb->h.uh; | |
1da177e4 LT |
1209 | unsigned short ulen; |
1210 | struct rtable *rt = (struct rtable*)skb->dst; | |
734ab87f AV |
1211 | __be32 saddr = skb->nh.iph->saddr; |
1212 | __be32 daddr = skb->nh.iph->daddr; | |
1da177e4 LT |
1213 | |
1214 | /* | |
ba4e58ec | 1215 | * Validate the packet. |
1da177e4 LT |
1216 | */ |
1217 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
ba4e58ec | 1218 | goto drop; /* No space for header. */ |
1da177e4 LT |
1219 | |
1220 | ulen = ntohs(uh->len); | |
ba4e58ec | 1221 | if (ulen > skb->len) |
1da177e4 LT |
1222 | goto short_packet; |
1223 | ||
759e5d00 HX |
1224 | if (proto == IPPROTO_UDP) { |
1225 | /* UDP validates ulen. */ | |
ba4e58ec GR |
1226 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) |
1227 | goto short_packet; | |
d644329b | 1228 | uh = skb->h.uh; |
ba4e58ec | 1229 | } |
1da177e4 | 1230 | |
759e5d00 HX |
1231 | if (udp4_csum_init(skb, uh, proto)) |
1232 | goto csum_error; | |
1233 | ||
6516c655 | 1234 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
ba4e58ec | 1235 | return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable); |
1da177e4 | 1236 | |
ba4e58ec GR |
1237 | sk = __udp4_lib_lookup(saddr, uh->source, daddr, uh->dest, |
1238 | skb->dev->ifindex, udptable ); | |
1da177e4 LT |
1239 | |
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 | |
ba4e58ec | 1245 | * it wants the return to be -protocol, or 0 |
1da177e4 LT |
1246 | */ |
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; | |
b59c2701 | 1254 | nf_reset(skb); |
1da177e4 LT |
1255 | |
1256 | /* No socket. Drop packet silently, if checksum is wrong */ | |
ba4e58ec | 1257 | if (udp_lib_checksum_complete(skb)) |
1da177e4 LT |
1258 | goto csum_error; |
1259 | ||
759e5d00 | 1260 | UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
1da177e4 LT |
1261 | 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); | |
6516c655 | 1268 | return 0; |
1da177e4 LT |
1269 | |
1270 | short_packet: | |
ba4e58ec | 1271 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n", |
759e5d00 | 1272 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
64ce2073 PM |
1273 | NIPQUAD(saddr), |
1274 | ntohs(uh->source), | |
1275 | ulen, | |
ba4e58ec | 1276 | skb->len, |
64ce2073 PM |
1277 | NIPQUAD(daddr), |
1278 | ntohs(uh->dest)); | |
ba4e58ec | 1279 | goto drop; |
1da177e4 LT |
1280 | |
1281 | csum_error: | |
e905a9ed YH |
1282 | /* |
1283 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1284 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1da177e4 | 1285 | */ |
ba4e58ec | 1286 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n", |
759e5d00 | 1287 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
64ce2073 PM |
1288 | NIPQUAD(saddr), |
1289 | ntohs(uh->source), | |
1290 | NIPQUAD(daddr), | |
1291 | ntohs(uh->dest), | |
1292 | ulen); | |
1da177e4 | 1293 | drop: |
759e5d00 | 1294 | UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 1295 | kfree_skb(skb); |
6516c655 | 1296 | return 0; |
1da177e4 LT |
1297 | } |
1298 | ||
ba4e58ec GR |
1299 | __inline__ int udp_rcv(struct sk_buff *skb) |
1300 | { | |
759e5d00 | 1301 | return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP); |
ba4e58ec GR |
1302 | } |
1303 | ||
1304 | int udp_destroy_sock(struct sock *sk) | |
1da177e4 LT |
1305 | { |
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 | */ | |
4c0a6cb0 GR |
1315 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
1316 | char __user *optval, int optlen, | |
1317 | int (*push_pending_frames)(struct sock *)) | |
1da177e4 LT |
1318 | { |
1319 | struct udp_sock *up = udp_sk(sk); | |
1320 | int val; | |
1321 | int err = 0; | |
1322 | ||
6516c655 | 1323 | if (optlen<sizeof(int)) |
1da177e4 LT |
1324 | return -EINVAL; |
1325 | ||
1326 | if (get_user(val, (int __user *)optval)) | |
1327 | return -EFAULT; | |
1328 | ||
6516c655 | 1329 | switch (optname) { |
1da177e4 LT |
1330 | case UDP_CORK: |
1331 | if (val != 0) { | |
1332 | up->corkflag = 1; | |
1333 | } else { | |
1334 | up->corkflag = 0; | |
1335 | lock_sock(sk); | |
4c0a6cb0 | 1336 | (*push_pending_frames)(sk); |
1da177e4 LT |
1337 | release_sock(sk); |
1338 | } | |
1339 | break; | |
e905a9ed | 1340 | |
1da177e4 LT |
1341 | 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 | ||
ba4e58ec GR |
1354 | /* |
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 | ||
e905a9ed YH |
1368 | /* 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 | |
ba4e58ec GR |
1370 | * 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 | ||
1da177e4 LT |
1380 | default: |
1381 | err = -ENOPROTOOPT; | |
1382 | break; | |
6516c655 | 1383 | } |
1da177e4 LT |
1384 | |
1385 | return err; | |
1386 | } | |
1387 | ||
ba4e58ec GR |
1388 | int udp_setsockopt(struct sock *sk, int level, int optname, |
1389 | char __user *optval, int optlen) | |
3fdadf7d | 1390 | { |
ba4e58ec | 1391 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1392 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1393 | udp_push_pending_frames); | |
ba4e58ec | 1394 | return ip_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1395 | } |
1396 | ||
1397 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1398 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, |
1399 | char __user *optval, int optlen) | |
3fdadf7d | 1400 | { |
ba4e58ec | 1401 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1402 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1403 | udp_push_pending_frames); | |
ba4e58ec | 1404 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1405 | } |
1406 | #endif | |
1407 | ||
4c0a6cb0 GR |
1408 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
1409 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
1410 | { |
1411 | struct udp_sock *up = udp_sk(sk); | |
1412 | int val, len; | |
1413 | ||
6516c655 | 1414 | if (get_user(len,optlen)) |
1da177e4 LT |
1415 | return -EFAULT; |
1416 | ||
1417 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 1418 | |
6516c655 | 1419 | if (len < 0) |
1da177e4 LT |
1420 | return -EINVAL; |
1421 | ||
6516c655 | 1422 | switch (optname) { |
1da177e4 LT |
1423 | case UDP_CORK: |
1424 | val = up->corkflag; | |
1425 | break; | |
1426 | ||
1427 | case UDP_ENCAP: | |
1428 | val = up->encap_type; | |
1429 | break; | |
1430 | ||
ba4e58ec GR |
1431 | /* 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 | ||
1da177e4 LT |
1441 | default: |
1442 | return -ENOPROTOOPT; | |
6516c655 | 1443 | } |
1da177e4 | 1444 | |
6516c655 | 1445 | if (put_user(len, optlen)) |
e905a9ed | 1446 | return -EFAULT; |
6516c655 | 1447 | if (copy_to_user(optval, &val,len)) |
1da177e4 | 1448 | return -EFAULT; |
e905a9ed | 1449 | return 0; |
1da177e4 LT |
1450 | } |
1451 | ||
ba4e58ec GR |
1452 | int udp_getsockopt(struct sock *sk, int level, int optname, |
1453 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1454 | { |
ba4e58ec | 1455 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1456 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1457 | return ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1458 | } |
1459 | ||
1460 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1461 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, |
543d9cfe | 1462 | char __user *optval, int __user *optlen) |
3fdadf7d | 1463 | { |
ba4e58ec | 1464 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1465 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1466 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1467 | } |
1468 | #endif | |
1da177e4 LT |
1469 | /** |
1470 | * udp_poll - wait for a UDP event. | |
1471 | * @file - file struct | |
1472 | * @sock - socket | |
1473 | * @wait - poll table | |
1474 | * | |
e905a9ed | 1475 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
1476 | * 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 | */ | |
1482 | unsigned 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; | |
ba4e58ec GR |
1486 | int is_lite = IS_UDPLITE(sk); |
1487 | ||
1da177e4 LT |
1488 | /* 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 | ||
208d8984 | 1495 | spin_lock_bh(&rcvq->lock); |
759e5d00 HX |
1496 | 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); | |
1da177e4 | 1501 | } |
208d8984 | 1502 | spin_unlock_bh(&rcvq->lock); |
1da177e4 LT |
1503 | |
1504 | /* nothing to see, move along */ | |
1505 | if (skb == NULL) | |
1506 | mask &= ~(POLLIN | POLLRDNORM); | |
1507 | } | |
1508 | ||
1509 | return mask; | |
e905a9ed | 1510 | |
1da177e4 LT |
1511 | } |
1512 | ||
1513 | struct proto udp_prot = { | |
e905a9ed | 1514 | .name = "UDP", |
543d9cfe | 1515 | .owner = THIS_MODULE, |
ba4e58ec | 1516 | .close = udp_lib_close, |
543d9cfe ACM |
1517 | .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, | |
ba4e58ec GR |
1527 | .hash = udp_lib_hash, |
1528 | .unhash = udp_lib_unhash, | |
543d9cfe ACM |
1529 | .get_port = udp_v4_get_port, |
1530 | .obj_size = sizeof(struct udp_sock), | |
3fdadf7d | 1531 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1532 | .compat_setsockopt = compat_udp_setsockopt, |
1533 | .compat_getsockopt = compat_udp_getsockopt, | |
3fdadf7d | 1534 | #endif |
1da177e4 LT |
1535 | }; |
1536 | ||
1537 | /* ------------------------------------------------------------------------ */ | |
1538 | #ifdef CONFIG_PROC_FS | |
1539 | ||
1540 | static 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; | |
ba4e58ec | 1547 | sk_for_each(sk, node, state->hashtable + state->bucket) { |
1da177e4 LT |
1548 | if (sk->sk_family == state->family) |
1549 | goto found; | |
1550 | } | |
1551 | } | |
1552 | sk = NULL; | |
1553 | found: | |
1554 | return sk; | |
1555 | } | |
1556 | ||
1557 | static 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); | |
1563 | try_again: | |
1564 | ; | |
1565 | } while (sk && sk->sk_family != state->family); | |
1566 | ||
1567 | if (!sk && ++state->bucket < UDP_HTABLE_SIZE) { | |
ba4e58ec | 1568 | sk = sk_head(state->hashtable + state->bucket); |
1da177e4 LT |
1569 | goto try_again; |
1570 | } | |
1571 | return sk; | |
1572 | } | |
1573 | ||
1574 | static 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) | |
6516c655 | 1579 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
1580 | --pos; |
1581 | return pos ? NULL : sk; | |
1582 | } | |
1583 | ||
1584 | static 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 | ||
1590 | static 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 | ||
1603 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
1604 | { | |
1605 | read_unlock(&udp_hash_lock); | |
1606 | } | |
1607 | ||
1608 | static 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; | |
0da974f4 | 1613 | struct udp_iter_state *s = kzalloc(sizeof(*s), GFP_KERNEL); |
1da177e4 LT |
1614 | |
1615 | if (!s) | |
1616 | goto out; | |
1da177e4 | 1617 | s->family = afinfo->family; |
ba4e58ec | 1618 | s->hashtable = afinfo->hashtable; |
1da177e4 LT |
1619 | 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; | |
1630 | out: | |
1631 | return rc; | |
1632 | out_kfree: | |
1633 | kfree(s); | |
1634 | goto out; | |
1635 | } | |
1636 | ||
1637 | /* ------------------------------------------------------------------------ */ | |
1638 | int 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 | ||
1659 | void 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 | /* ------------------------------------------------------------------------ */ | |
1668 | static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket) | |
1669 | { | |
1670 | struct inet_sock *inet = inet_sk(sp); | |
734ab87f AV |
1671 | __be32 dest = inet->daddr; |
1672 | __be32 src = inet->rcv_saddr; | |
1da177e4 LT |
1673 | __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", | |
e905a9ed | 1678 | bucket, src, srcp, dest, destp, sp->sk_state, |
1da177e4 LT |
1679 | 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 | ||
ba4e58ec | 1685 | int udp4_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1686 | { |
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 | /* ------------------------------------------------------------------------ */ | |
1703 | static struct file_operations udp4_seq_fops; | |
1704 | static struct udp_seq_afinfo udp4_seq_afinfo = { | |
1705 | .owner = THIS_MODULE, | |
1706 | .name = "udp", | |
1707 | .family = AF_INET, | |
ba4e58ec | 1708 | .hashtable = udp_hash, |
1da177e4 LT |
1709 | .seq_show = udp4_seq_show, |
1710 | .seq_fops = &udp4_seq_fops, | |
1711 | }; | |
1712 | ||
1713 | int __init udp4_proc_init(void) | |
1714 | { | |
1715 | return udp_proc_register(&udp4_seq_afinfo); | |
1716 | } | |
1717 | ||
1718 | void udp4_proc_exit(void) | |
1719 | { | |
1720 | udp_proc_unregister(&udp4_seq_afinfo); | |
1721 | } | |
1722 | #endif /* CONFIG_PROC_FS */ | |
1723 | ||
1724 | EXPORT_SYMBOL(udp_disconnect); | |
1725 | EXPORT_SYMBOL(udp_hash); | |
1726 | EXPORT_SYMBOL(udp_hash_lock); | |
1727 | EXPORT_SYMBOL(udp_ioctl); | |
25030a7f | 1728 | EXPORT_SYMBOL(udp_get_port); |
1da177e4 LT |
1729 | EXPORT_SYMBOL(udp_prot); |
1730 | EXPORT_SYMBOL(udp_sendmsg); | |
4c0a6cb0 GR |
1731 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1732 | EXPORT_SYMBOL(udp_lib_setsockopt); | |
1da177e4 LT |
1733 | EXPORT_SYMBOL(udp_poll); |
1734 | ||
1735 | #ifdef CONFIG_PROC_FS | |
1736 | EXPORT_SYMBOL(udp_proc_register); | |
1737 | EXPORT_SYMBOL(udp_proc_unregister); | |
1738 | #endif |