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Merge branch 'for-airlied' of git://people.freedesktop.org/~danvet/drm-intel into...
[deliverable/linux.git] / net / ipv6 / udp.c
1 /*
2 * UDP over IPv6
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/ipv4/udp.c
9 *
10 * Fixes:
11 * Hideaki YOSHIFUJI : sin6_scope_id support
12 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
13 * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind
14 * a single port at the same time.
15 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
16 * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file.
17 *
18 * This program is free software; you can redistribute it and/or
19 * modify it under the terms of the GNU General Public License
20 * as published by the Free Software Foundation; either version
21 * 2 of the License, or (at your option) any later version.
22 */
23
24 #include <linux/errno.h>
25 #include <linux/types.h>
26 #include <linux/socket.h>
27 #include <linux/sockios.h>
28 #include <linux/net.h>
29 #include <linux/in6.h>
30 #include <linux/netdevice.h>
31 #include <linux/if_arp.h>
32 #include <linux/ipv6.h>
33 #include <linux/icmpv6.h>
34 #include <linux/init.h>
35 #include <linux/module.h>
36 #include <linux/skbuff.h>
37 #include <linux/slab.h>
38 #include <asm/uaccess.h>
39
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/transp_v6.h>
43 #include <net/ip6_route.h>
44 #include <net/raw.h>
45 #include <net/tcp_states.h>
46 #include <net/ip6_checksum.h>
47 #include <net/xfrm.h>
48
49 #include <linux/proc_fs.h>
50 #include <linux/seq_file.h>
51 #include <trace/events/skb.h>
52 #include "udp_impl.h"
53
54 int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2)
55 {
56 const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr;
57 const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
58 __be32 sk1_rcv_saddr = sk_rcv_saddr(sk);
59 __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2);
60 int sk_ipv6only = ipv6_only_sock(sk);
61 int sk2_ipv6only = inet_v6_ipv6only(sk2);
62 int addr_type = ipv6_addr_type(sk_rcv_saddr6);
63 int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
64
65 /* if both are mapped, treat as IPv4 */
66 if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED)
67 return (!sk2_ipv6only &&
68 (!sk1_rcv_saddr || !sk2_rcv_saddr ||
69 sk1_rcv_saddr == sk2_rcv_saddr));
70
71 if (addr_type2 == IPV6_ADDR_ANY &&
72 !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
73 return 1;
74
75 if (addr_type == IPV6_ADDR_ANY &&
76 !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED))
77 return 1;
78
79 if (sk2_rcv_saddr6 &&
80 ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6))
81 return 1;
82
83 return 0;
84 }
85
86 static unsigned int udp6_portaddr_hash(struct net *net,
87 const struct in6_addr *addr6,
88 unsigned int port)
89 {
90 unsigned int hash, mix = net_hash_mix(net);
91
92 if (ipv6_addr_any(addr6))
93 hash = jhash_1word(0, mix);
94 else if (ipv6_addr_v4mapped(addr6))
95 hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix);
96 else
97 hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix);
98
99 return hash ^ port;
100 }
101
102
103 int udp_v6_get_port(struct sock *sk, unsigned short snum)
104 {
105 unsigned int hash2_nulladdr =
106 udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum);
107 unsigned int hash2_partial =
108 udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0);
109
110 /* precompute partial secondary hash */
111 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
112 return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr);
113 }
114
115 static void udp_v6_rehash(struct sock *sk)
116 {
117 u16 new_hash = udp6_portaddr_hash(sock_net(sk),
118 &inet6_sk(sk)->rcv_saddr,
119 inet_sk(sk)->inet_num);
120
121 udp_lib_rehash(sk, new_hash);
122 }
123
124 static inline int compute_score(struct sock *sk, struct net *net,
125 unsigned short hnum,
126 const struct in6_addr *saddr, __be16 sport,
127 const struct in6_addr *daddr, __be16 dport,
128 int dif)
129 {
130 int score = -1;
131
132 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
133 sk->sk_family == PF_INET6) {
134 struct ipv6_pinfo *np = inet6_sk(sk);
135 struct inet_sock *inet = inet_sk(sk);
136
137 score = 0;
138 if (inet->inet_dport) {
139 if (inet->inet_dport != sport)
140 return -1;
141 score++;
142 }
143 if (!ipv6_addr_any(&np->rcv_saddr)) {
144 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
145 return -1;
146 score++;
147 }
148 if (!ipv6_addr_any(&np->daddr)) {
149 if (!ipv6_addr_equal(&np->daddr, saddr))
150 return -1;
151 score++;
152 }
153 if (sk->sk_bound_dev_if) {
154 if (sk->sk_bound_dev_if != dif)
155 return -1;
156 score++;
157 }
158 }
159 return score;
160 }
161
162 #define SCORE2_MAX (1 + 1 + 1)
163 static inline int compute_score2(struct sock *sk, struct net *net,
164 const struct in6_addr *saddr, __be16 sport,
165 const struct in6_addr *daddr, unsigned short hnum,
166 int dif)
167 {
168 int score = -1;
169
170 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
171 sk->sk_family == PF_INET6) {
172 struct ipv6_pinfo *np = inet6_sk(sk);
173 struct inet_sock *inet = inet_sk(sk);
174
175 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
176 return -1;
177 score = 0;
178 if (inet->inet_dport) {
179 if (inet->inet_dport != sport)
180 return -1;
181 score++;
182 }
183 if (!ipv6_addr_any(&np->daddr)) {
184 if (!ipv6_addr_equal(&np->daddr, saddr))
185 return -1;
186 score++;
187 }
188 if (sk->sk_bound_dev_if) {
189 if (sk->sk_bound_dev_if != dif)
190 return -1;
191 score++;
192 }
193 }
194 return score;
195 }
196
197
198 /* called with read_rcu_lock() */
199 static struct sock *udp6_lib_lookup2(struct net *net,
200 const struct in6_addr *saddr, __be16 sport,
201 const struct in6_addr *daddr, unsigned int hnum, int dif,
202 struct udp_hslot *hslot2, unsigned int slot2)
203 {
204 struct sock *sk, *result;
205 struct hlist_nulls_node *node;
206 int score, badness;
207
208 begin:
209 result = NULL;
210 badness = -1;
211 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
212 score = compute_score2(sk, net, saddr, sport,
213 daddr, hnum, dif);
214 if (score > badness) {
215 result = sk;
216 badness = score;
217 if (score == SCORE2_MAX)
218 goto exact_match;
219 }
220 }
221 /*
222 * if the nulls value we got at the end of this lookup is
223 * not the expected one, we must restart lookup.
224 * We probably met an item that was moved to another chain.
225 */
226 if (get_nulls_value(node) != slot2)
227 goto begin;
228
229 if (result) {
230 exact_match:
231 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
232 result = NULL;
233 else if (unlikely(compute_score2(result, net, saddr, sport,
234 daddr, hnum, dif) < badness)) {
235 sock_put(result);
236 goto begin;
237 }
238 }
239 return result;
240 }
241
242 struct sock *__udp6_lib_lookup(struct net *net,
243 const struct in6_addr *saddr, __be16 sport,
244 const struct in6_addr *daddr, __be16 dport,
245 int dif, struct udp_table *udptable)
246 {
247 struct sock *sk, *result;
248 struct hlist_nulls_node *node;
249 unsigned short hnum = ntohs(dport);
250 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
251 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
252 int score, badness;
253
254 rcu_read_lock();
255 if (hslot->count > 10) {
256 hash2 = udp6_portaddr_hash(net, daddr, hnum);
257 slot2 = hash2 & udptable->mask;
258 hslot2 = &udptable->hash2[slot2];
259 if (hslot->count < hslot2->count)
260 goto begin;
261
262 result = udp6_lib_lookup2(net, saddr, sport,
263 daddr, hnum, dif,
264 hslot2, slot2);
265 if (!result) {
266 hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum);
267 slot2 = hash2 & udptable->mask;
268 hslot2 = &udptable->hash2[slot2];
269 if (hslot->count < hslot2->count)
270 goto begin;
271
272 result = udp6_lib_lookup2(net, saddr, sport,
273 &in6addr_any, hnum, dif,
274 hslot2, slot2);
275 }
276 rcu_read_unlock();
277 return result;
278 }
279 begin:
280 result = NULL;
281 badness = -1;
282 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
283 score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
284 if (score > badness) {
285 result = sk;
286 badness = score;
287 }
288 }
289 /*
290 * if the nulls value we got at the end of this lookup is
291 * not the expected one, we must restart lookup.
292 * We probably met an item that was moved to another chain.
293 */
294 if (get_nulls_value(node) != slot)
295 goto begin;
296
297 if (result) {
298 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
299 result = NULL;
300 else if (unlikely(compute_score(result, net, hnum, saddr, sport,
301 daddr, dport, dif) < badness)) {
302 sock_put(result);
303 goto begin;
304 }
305 }
306 rcu_read_unlock();
307 return result;
308 }
309 EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
310
311 static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
312 __be16 sport, __be16 dport,
313 struct udp_table *udptable)
314 {
315 struct sock *sk;
316 const struct ipv6hdr *iph = ipv6_hdr(skb);
317
318 if (unlikely(sk = skb_steal_sock(skb)))
319 return sk;
320 return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport,
321 &iph->daddr, dport, inet6_iif(skb),
322 udptable);
323 }
324
325 struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
326 const struct in6_addr *daddr, __be16 dport, int dif)
327 {
328 return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
329 }
330 EXPORT_SYMBOL_GPL(udp6_lib_lookup);
331
332
333 /*
334 * This should be easy, if there is something there we
335 * return it, otherwise we block.
336 */
337
338 int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk,
339 struct msghdr *msg, size_t len,
340 int noblock, int flags, int *addr_len)
341 {
342 struct ipv6_pinfo *np = inet6_sk(sk);
343 struct inet_sock *inet = inet_sk(sk);
344 struct sk_buff *skb;
345 unsigned int ulen, copied;
346 int peeked, off = 0;
347 int err;
348 int is_udplite = IS_UDPLITE(sk);
349 int is_udp4;
350 bool slow;
351
352 if (addr_len)
353 *addr_len = sizeof(struct sockaddr_in6);
354
355 if (flags & MSG_ERRQUEUE)
356 return ipv6_recv_error(sk, msg, len);
357
358 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
359 return ipv6_recv_rxpmtu(sk, msg, len);
360
361 try_again:
362 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
363 &peeked, &off, &err);
364 if (!skb)
365 goto out;
366
367 ulen = skb->len - sizeof(struct udphdr);
368 copied = len;
369 if (copied > ulen)
370 copied = ulen;
371 else if (copied < ulen)
372 msg->msg_flags |= MSG_TRUNC;
373
374 is_udp4 = (skb->protocol == htons(ETH_P_IP));
375
376 /*
377 * If checksum is needed at all, try to do it while copying the
378 * data. If the data is truncated, or if we only want a partial
379 * coverage checksum (UDP-Lite), do it before the copy.
380 */
381
382 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
383 if (udp_lib_checksum_complete(skb))
384 goto csum_copy_err;
385 }
386
387 if (skb_csum_unnecessary(skb))
388 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
389 msg->msg_iov, copied);
390 else {
391 err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
392 if (err == -EINVAL)
393 goto csum_copy_err;
394 }
395 if (unlikely(err)) {
396 trace_kfree_skb(skb, udpv6_recvmsg);
397 goto out_free;
398 }
399 if (!peeked) {
400 if (is_udp4)
401 UDP_INC_STATS_USER(sock_net(sk),
402 UDP_MIB_INDATAGRAMS, is_udplite);
403 else
404 UDP6_INC_STATS_USER(sock_net(sk),
405 UDP_MIB_INDATAGRAMS, is_udplite);
406 }
407
408 sock_recv_ts_and_drops(msg, sk, skb);
409
410 /* Copy the address. */
411 if (msg->msg_name) {
412 struct sockaddr_in6 *sin6;
413
414 sin6 = (struct sockaddr_in6 *) msg->msg_name;
415 sin6->sin6_family = AF_INET6;
416 sin6->sin6_port = udp_hdr(skb)->source;
417 sin6->sin6_flowinfo = 0;
418 sin6->sin6_scope_id = 0;
419
420 if (is_udp4)
421 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
422 &sin6->sin6_addr);
423 else {
424 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
425 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
426 sin6->sin6_scope_id = IP6CB(skb)->iif;
427 }
428
429 }
430 if (is_udp4) {
431 if (inet->cmsg_flags)
432 ip_cmsg_recv(msg, skb);
433 } else {
434 if (np->rxopt.all)
435 datagram_recv_ctl(sk, msg, skb);
436 }
437
438 err = copied;
439 if (flags & MSG_TRUNC)
440 err = ulen;
441
442 out_free:
443 skb_free_datagram_locked(sk, skb);
444 out:
445 return err;
446
447 csum_copy_err:
448 slow = lock_sock_fast(sk);
449 if (!skb_kill_datagram(sk, skb, flags)) {
450 if (is_udp4)
451 UDP_INC_STATS_USER(sock_net(sk),
452 UDP_MIB_INERRORS, is_udplite);
453 else
454 UDP6_INC_STATS_USER(sock_net(sk),
455 UDP_MIB_INERRORS, is_udplite);
456 }
457 unlock_sock_fast(sk, slow);
458
459 if (noblock)
460 return -EAGAIN;
461
462 /* starting over for a new packet */
463 msg->msg_flags &= ~MSG_TRUNC;
464 goto try_again;
465 }
466
467 void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
468 u8 type, u8 code, int offset, __be32 info,
469 struct udp_table *udptable)
470 {
471 struct ipv6_pinfo *np;
472 const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data;
473 const struct in6_addr *saddr = &hdr->saddr;
474 const struct in6_addr *daddr = &hdr->daddr;
475 struct udphdr *uh = (struct udphdr*)(skb->data+offset);
476 struct sock *sk;
477 int err;
478
479 sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest,
480 saddr, uh->source, inet6_iif(skb), udptable);
481 if (sk == NULL)
482 return;
483
484 if (type == ICMPV6_PKT_TOOBIG)
485 ip6_sk_update_pmtu(skb, sk, info);
486 if (type == NDISC_REDIRECT)
487 ip6_sk_redirect(skb, sk);
488
489 np = inet6_sk(sk);
490
491 if (!icmpv6_err_convert(type, code, &err) && !np->recverr)
492 goto out;
493
494 if (sk->sk_state != TCP_ESTABLISHED && !np->recverr)
495 goto out;
496
497 if (np->recverr)
498 ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1));
499
500 sk->sk_err = err;
501 sk->sk_error_report(sk);
502 out:
503 sock_put(sk);
504 }
505
506 static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
507 {
508 int rc;
509
510 if (!ipv6_addr_any(&inet6_sk(sk)->daddr))
511 sock_rps_save_rxhash(sk, skb);
512
513 rc = sock_queue_rcv_skb(sk, skb);
514 if (rc < 0) {
515 int is_udplite = IS_UDPLITE(sk);
516
517 /* Note that an ENOMEM error is charged twice */
518 if (rc == -ENOMEM)
519 UDP6_INC_STATS_BH(sock_net(sk),
520 UDP_MIB_RCVBUFERRORS, is_udplite);
521 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
522 kfree_skb(skb);
523 return -1;
524 }
525 return 0;
526 }
527
528 static __inline__ void udpv6_err(struct sk_buff *skb,
529 struct inet6_skb_parm *opt, u8 type,
530 u8 code, int offset, __be32 info )
531 {
532 __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table);
533 }
534
535 static struct static_key udpv6_encap_needed __read_mostly;
536 void udpv6_encap_enable(void)
537 {
538 if (!static_key_enabled(&udpv6_encap_needed))
539 static_key_slow_inc(&udpv6_encap_needed);
540 }
541 EXPORT_SYMBOL(udpv6_encap_enable);
542
543 int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
544 {
545 struct udp_sock *up = udp_sk(sk);
546 int rc;
547 int is_udplite = IS_UDPLITE(sk);
548
549 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
550 goto drop;
551
552 if (static_key_false(&udpv6_encap_needed) && up->encap_type) {
553 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
554
555 /*
556 * This is an encapsulation socket so pass the skb to
557 * the socket's udp_encap_rcv() hook. Otherwise, just
558 * fall through and pass this up the UDP socket.
559 * up->encap_rcv() returns the following value:
560 * =0 if skb was successfully passed to the encap
561 * handler or was discarded by it.
562 * >0 if skb should be passed on to UDP.
563 * <0 if skb should be resubmitted as proto -N
564 */
565
566 /* if we're overly short, let UDP handle it */
567 encap_rcv = ACCESS_ONCE(up->encap_rcv);
568 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
569 int ret;
570
571 ret = encap_rcv(sk, skb);
572 if (ret <= 0) {
573 UDP_INC_STATS_BH(sock_net(sk),
574 UDP_MIB_INDATAGRAMS,
575 is_udplite);
576 return -ret;
577 }
578 }
579
580 /* FALLTHROUGH -- it's a UDP Packet */
581 }
582
583 /*
584 * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c).
585 */
586 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
587
588 if (up->pcrlen == 0) { /* full coverage was set */
589 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage"
590 " %d while full coverage %d requested\n",
591 UDP_SKB_CB(skb)->cscov, skb->len);
592 goto drop;
593 }
594 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
595 LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d "
596 "too small, need min %d\n",
597 UDP_SKB_CB(skb)->cscov, up->pcrlen);
598 goto drop;
599 }
600 }
601
602 if (rcu_access_pointer(sk->sk_filter)) {
603 if (udp_lib_checksum_complete(skb))
604 goto drop;
605 }
606
607 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
608 goto drop;
609
610 skb_dst_drop(skb);
611
612 bh_lock_sock(sk);
613 rc = 0;
614 if (!sock_owned_by_user(sk))
615 rc = __udpv6_queue_rcv_skb(sk, skb);
616 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
617 bh_unlock_sock(sk);
618 goto drop;
619 }
620 bh_unlock_sock(sk);
621
622 return rc;
623 drop:
624 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
625 atomic_inc(&sk->sk_drops);
626 kfree_skb(skb);
627 return -1;
628 }
629
630 static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
631 __be16 loc_port, const struct in6_addr *loc_addr,
632 __be16 rmt_port, const struct in6_addr *rmt_addr,
633 int dif)
634 {
635 struct hlist_nulls_node *node;
636 struct sock *s = sk;
637 unsigned short num = ntohs(loc_port);
638
639 sk_nulls_for_each_from(s, node) {
640 struct inet_sock *inet = inet_sk(s);
641
642 if (!net_eq(sock_net(s), net))
643 continue;
644
645 if (udp_sk(s)->udp_port_hash == num &&
646 s->sk_family == PF_INET6) {
647 struct ipv6_pinfo *np = inet6_sk(s);
648 if (inet->inet_dport) {
649 if (inet->inet_dport != rmt_port)
650 continue;
651 }
652 if (!ipv6_addr_any(&np->daddr) &&
653 !ipv6_addr_equal(&np->daddr, rmt_addr))
654 continue;
655
656 if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)
657 continue;
658
659 if (!ipv6_addr_any(&np->rcv_saddr)) {
660 if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr))
661 continue;
662 }
663 if (!inet6_mc_check(s, loc_addr, rmt_addr))
664 continue;
665 return s;
666 }
667 }
668 return NULL;
669 }
670
671 static void flush_stack(struct sock **stack, unsigned int count,
672 struct sk_buff *skb, unsigned int final)
673 {
674 struct sk_buff *skb1 = NULL;
675 struct sock *sk;
676 unsigned int i;
677
678 for (i = 0; i < count; i++) {
679 sk = stack[i];
680 if (likely(skb1 == NULL))
681 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
682 if (!skb1) {
683 atomic_inc(&sk->sk_drops);
684 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
685 IS_UDPLITE(sk));
686 UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
687 IS_UDPLITE(sk));
688 }
689
690 if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
691 skb1 = NULL;
692 }
693 if (unlikely(skb1))
694 kfree_skb(skb1);
695 }
696 /*
697 * Note: called only from the BH handler context,
698 * so we don't need to lock the hashes.
699 */
700 static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
701 const struct in6_addr *saddr, const struct in6_addr *daddr,
702 struct udp_table *udptable)
703 {
704 struct sock *sk, *stack[256 / sizeof(struct sock *)];
705 const struct udphdr *uh = udp_hdr(skb);
706 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
707 int dif;
708 unsigned int i, count = 0;
709
710 spin_lock(&hslot->lock);
711 sk = sk_nulls_head(&hslot->head);
712 dif = inet6_iif(skb);
713 sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
714 while (sk) {
715 stack[count++] = sk;
716 sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr,
717 uh->source, saddr, dif);
718 if (unlikely(count == ARRAY_SIZE(stack))) {
719 if (!sk)
720 break;
721 flush_stack(stack, count, skb, ~0);
722 count = 0;
723 }
724 }
725 /*
726 * before releasing the lock, we must take reference on sockets
727 */
728 for (i = 0; i < count; i++)
729 sock_hold(stack[i]);
730
731 spin_unlock(&hslot->lock);
732
733 if (count) {
734 flush_stack(stack, count, skb, count - 1);
735
736 for (i = 0; i < count; i++)
737 sock_put(stack[i]);
738 } else {
739 kfree_skb(skb);
740 }
741 return 0;
742 }
743
744 static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh,
745 int proto)
746 {
747 int err;
748
749 UDP_SKB_CB(skb)->partial_cov = 0;
750 UDP_SKB_CB(skb)->cscov = skb->len;
751
752 if (proto == IPPROTO_UDPLITE) {
753 err = udplite_checksum_init(skb, uh);
754 if (err)
755 return err;
756 }
757
758 if (uh->check == 0) {
759 /* RFC 2460 section 8.1 says that we SHOULD log
760 this error. Well, it is reasonable.
761 */
762 LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n");
763 return 1;
764 }
765 if (skb->ip_summed == CHECKSUM_COMPLETE &&
766 !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
767 skb->len, proto, skb->csum))
768 skb->ip_summed = CHECKSUM_UNNECESSARY;
769
770 if (!skb_csum_unnecessary(skb))
771 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
772 &ipv6_hdr(skb)->daddr,
773 skb->len, proto, 0));
774
775 return 0;
776 }
777
778 int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
779 int proto)
780 {
781 struct net *net = dev_net(skb->dev);
782 struct sock *sk;
783 struct udphdr *uh;
784 const struct in6_addr *saddr, *daddr;
785 u32 ulen = 0;
786
787 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
788 goto discard;
789
790 saddr = &ipv6_hdr(skb)->saddr;
791 daddr = &ipv6_hdr(skb)->daddr;
792 uh = udp_hdr(skb);
793
794 ulen = ntohs(uh->len);
795 if (ulen > skb->len)
796 goto short_packet;
797
798 if (proto == IPPROTO_UDP) {
799 /* UDP validates ulen. */
800
801 /* Check for jumbo payload */
802 if (ulen == 0)
803 ulen = skb->len;
804
805 if (ulen < sizeof(*uh))
806 goto short_packet;
807
808 if (ulen < skb->len) {
809 if (pskb_trim_rcsum(skb, ulen))
810 goto short_packet;
811 saddr = &ipv6_hdr(skb)->saddr;
812 daddr = &ipv6_hdr(skb)->daddr;
813 uh = udp_hdr(skb);
814 }
815 }
816
817 if (udp6_csum_init(skb, uh, proto))
818 goto discard;
819
820 /*
821 * Multicast receive code
822 */
823 if (ipv6_addr_is_multicast(daddr))
824 return __udp6_lib_mcast_deliver(net, skb,
825 saddr, daddr, udptable);
826
827 /* Unicast */
828
829 /*
830 * check socket cache ... must talk to Alan about his plans
831 * for sock caches... i'll skip this for now.
832 */
833 sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
834 if (sk != NULL) {
835 int ret = udpv6_queue_rcv_skb(sk, skb);
836 sock_put(sk);
837
838 /* a return value > 0 means to resubmit the input, but
839 * it wants the return to be -protocol, or 0
840 */
841 if (ret > 0)
842 return -ret;
843
844 return 0;
845 }
846
847 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
848 goto discard;
849
850 if (udp_lib_checksum_complete(skb))
851 goto discard;
852
853 UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
854 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
855
856 kfree_skb(skb);
857 return 0;
858
859 short_packet:
860 LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n",
861 proto == IPPROTO_UDPLITE ? "-Lite" : "",
862 saddr,
863 ntohs(uh->source),
864 ulen,
865 skb->len,
866 daddr,
867 ntohs(uh->dest));
868
869 discard:
870 UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
871 kfree_skb(skb);
872 return 0;
873 }
874
875 static __inline__ int udpv6_rcv(struct sk_buff *skb)
876 {
877 return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP);
878 }
879
880 /*
881 * Throw away all pending data and cancel the corking. Socket is locked.
882 */
883 static void udp_v6_flush_pending_frames(struct sock *sk)
884 {
885 struct udp_sock *up = udp_sk(sk);
886
887 if (up->pending == AF_INET)
888 udp_flush_pending_frames(sk);
889 else if (up->pending) {
890 up->len = 0;
891 up->pending = 0;
892 ip6_flush_pending_frames(sk);
893 }
894 }
895
896 /**
897 * udp6_hwcsum_outgoing - handle outgoing HW checksumming
898 * @sk: socket we are sending on
899 * @skb: sk_buff containing the filled-in UDP header
900 * (checksum field must be zeroed out)
901 */
902 static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
903 const struct in6_addr *saddr,
904 const struct in6_addr *daddr, int len)
905 {
906 unsigned int offset;
907 struct udphdr *uh = udp_hdr(skb);
908 __wsum csum = 0;
909
910 if (skb_queue_len(&sk->sk_write_queue) == 1) {
911 /* Only one fragment on the socket. */
912 skb->csum_start = skb_transport_header(skb) - skb->head;
913 skb->csum_offset = offsetof(struct udphdr, check);
914 uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);
915 } else {
916 /*
917 * HW-checksum won't work as there are two or more
918 * fragments on the socket so that all csums of sk_buffs
919 * should be together
920 */
921 offset = skb_transport_offset(skb);
922 skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
923
924 skb->ip_summed = CHECKSUM_NONE;
925
926 skb_queue_walk(&sk->sk_write_queue, skb) {
927 csum = csum_add(csum, skb->csum);
928 }
929
930 uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,
931 csum);
932 if (uh->check == 0)
933 uh->check = CSUM_MANGLED_0;
934 }
935 }
936
937 /*
938 * Sending
939 */
940
941 static int udp_v6_push_pending_frames(struct sock *sk)
942 {
943 struct sk_buff *skb;
944 struct udphdr *uh;
945 struct udp_sock *up = udp_sk(sk);
946 struct inet_sock *inet = inet_sk(sk);
947 struct flowi6 *fl6 = &inet->cork.fl.u.ip6;
948 int err = 0;
949 int is_udplite = IS_UDPLITE(sk);
950 __wsum csum = 0;
951
952 /* Grab the skbuff where UDP header space exists. */
953 if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
954 goto out;
955
956 /*
957 * Create a UDP header
958 */
959 uh = udp_hdr(skb);
960 uh->source = fl6->fl6_sport;
961 uh->dest = fl6->fl6_dport;
962 uh->len = htons(up->len);
963 uh->check = 0;
964
965 if (is_udplite)
966 csum = udplite_csum_outgoing(sk, skb);
967 else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
968 udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr,
969 up->len);
970 goto send;
971 } else
972 csum = udp_csum_outgoing(sk, skb);
973
974 /* add protocol-dependent pseudo-header */
975 uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
976 up->len, fl6->flowi6_proto, csum);
977 if (uh->check == 0)
978 uh->check = CSUM_MANGLED_0;
979
980 send:
981 err = ip6_push_pending_frames(sk);
982 if (err) {
983 if (err == -ENOBUFS && !inet6_sk(sk)->recverr) {
984 UDP6_INC_STATS_USER(sock_net(sk),
985 UDP_MIB_SNDBUFERRORS, is_udplite);
986 err = 0;
987 }
988 } else
989 UDP6_INC_STATS_USER(sock_net(sk),
990 UDP_MIB_OUTDATAGRAMS, is_udplite);
991 out:
992 up->len = 0;
993 up->pending = 0;
994 return err;
995 }
996
997 int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk,
998 struct msghdr *msg, size_t len)
999 {
1000 struct ipv6_txoptions opt_space;
1001 struct udp_sock *up = udp_sk(sk);
1002 struct inet_sock *inet = inet_sk(sk);
1003 struct ipv6_pinfo *np = inet6_sk(sk);
1004 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name;
1005 struct in6_addr *daddr, *final_p, final;
1006 struct ipv6_txoptions *opt = NULL;
1007 struct ip6_flowlabel *flowlabel = NULL;
1008 struct flowi6 fl6;
1009 struct dst_entry *dst;
1010 int addr_len = msg->msg_namelen;
1011 int ulen = len;
1012 int hlimit = -1;
1013 int tclass = -1;
1014 int dontfrag = -1;
1015 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
1016 int err;
1017 int connected = 0;
1018 int is_udplite = IS_UDPLITE(sk);
1019 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
1020
1021 /* destination address check */
1022 if (sin6) {
1023 if (addr_len < offsetof(struct sockaddr, sa_data))
1024 return -EINVAL;
1025
1026 switch (sin6->sin6_family) {
1027 case AF_INET6:
1028 if (addr_len < SIN6_LEN_RFC2133)
1029 return -EINVAL;
1030 daddr = &sin6->sin6_addr;
1031 break;
1032 case AF_INET:
1033 goto do_udp_sendmsg;
1034 case AF_UNSPEC:
1035 msg->msg_name = sin6 = NULL;
1036 msg->msg_namelen = addr_len = 0;
1037 daddr = NULL;
1038 break;
1039 default:
1040 return -EINVAL;
1041 }
1042 } else if (!up->pending) {
1043 if (sk->sk_state != TCP_ESTABLISHED)
1044 return -EDESTADDRREQ;
1045 daddr = &np->daddr;
1046 } else
1047 daddr = NULL;
1048
1049 if (daddr) {
1050 if (ipv6_addr_v4mapped(daddr)) {
1051 struct sockaddr_in sin;
1052 sin.sin_family = AF_INET;
1053 sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport;
1054 sin.sin_addr.s_addr = daddr->s6_addr32[3];
1055 msg->msg_name = &sin;
1056 msg->msg_namelen = sizeof(sin);
1057 do_udp_sendmsg:
1058 if (__ipv6_only_sock(sk))
1059 return -ENETUNREACH;
1060 return udp_sendmsg(iocb, sk, msg, len);
1061 }
1062 }
1063
1064 if (up->pending == AF_INET)
1065 return udp_sendmsg(iocb, sk, msg, len);
1066
1067 /* Rough check on arithmetic overflow,
1068 better check is made in ip6_append_data().
1069 */
1070 if (len > INT_MAX - sizeof(struct udphdr))
1071 return -EMSGSIZE;
1072
1073 if (up->pending) {
1074 /*
1075 * There are pending frames.
1076 * The socket lock must be held while it's corked.
1077 */
1078 lock_sock(sk);
1079 if (likely(up->pending)) {
1080 if (unlikely(up->pending != AF_INET6)) {
1081 release_sock(sk);
1082 return -EAFNOSUPPORT;
1083 }
1084 dst = NULL;
1085 goto do_append_data;
1086 }
1087 release_sock(sk);
1088 }
1089 ulen += sizeof(struct udphdr);
1090
1091 memset(&fl6, 0, sizeof(fl6));
1092
1093 if (sin6) {
1094 if (sin6->sin6_port == 0)
1095 return -EINVAL;
1096
1097 fl6.fl6_dport = sin6->sin6_port;
1098 daddr = &sin6->sin6_addr;
1099
1100 if (np->sndflow) {
1101 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
1102 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
1103 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1104 if (flowlabel == NULL)
1105 return -EINVAL;
1106 daddr = &flowlabel->dst;
1107 }
1108 }
1109
1110 /*
1111 * Otherwise it will be difficult to maintain
1112 * sk->sk_dst_cache.
1113 */
1114 if (sk->sk_state == TCP_ESTABLISHED &&
1115 ipv6_addr_equal(daddr, &np->daddr))
1116 daddr = &np->daddr;
1117
1118 if (addr_len >= sizeof(struct sockaddr_in6) &&
1119 sin6->sin6_scope_id &&
1120 ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL)
1121 fl6.flowi6_oif = sin6->sin6_scope_id;
1122 } else {
1123 if (sk->sk_state != TCP_ESTABLISHED)
1124 return -EDESTADDRREQ;
1125
1126 fl6.fl6_dport = inet->inet_dport;
1127 daddr = &np->daddr;
1128 fl6.flowlabel = np->flow_label;
1129 connected = 1;
1130 }
1131
1132 if (!fl6.flowi6_oif)
1133 fl6.flowi6_oif = sk->sk_bound_dev_if;
1134
1135 if (!fl6.flowi6_oif)
1136 fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
1137
1138 fl6.flowi6_mark = sk->sk_mark;
1139
1140 if (msg->msg_controllen) {
1141 opt = &opt_space;
1142 memset(opt, 0, sizeof(struct ipv6_txoptions));
1143 opt->tot_len = sizeof(*opt);
1144
1145 err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt,
1146 &hlimit, &tclass, &dontfrag);
1147 if (err < 0) {
1148 fl6_sock_release(flowlabel);
1149 return err;
1150 }
1151 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
1152 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1153 if (flowlabel == NULL)
1154 return -EINVAL;
1155 }
1156 if (!(opt->opt_nflen|opt->opt_flen))
1157 opt = NULL;
1158 connected = 0;
1159 }
1160 if (opt == NULL)
1161 opt = np->opt;
1162 if (flowlabel)
1163 opt = fl6_merge_options(&opt_space, flowlabel, opt);
1164 opt = ipv6_fixup_options(&opt_space, opt);
1165
1166 fl6.flowi6_proto = sk->sk_protocol;
1167 if (!ipv6_addr_any(daddr))
1168 fl6.daddr = *daddr;
1169 else
1170 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
1171 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
1172 fl6.saddr = np->saddr;
1173 fl6.fl6_sport = inet->inet_sport;
1174
1175 final_p = fl6_update_dst(&fl6, opt, &final);
1176 if (final_p)
1177 connected = 0;
1178
1179 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) {
1180 fl6.flowi6_oif = np->mcast_oif;
1181 connected = 0;
1182 } else if (!fl6.flowi6_oif)
1183 fl6.flowi6_oif = np->ucast_oif;
1184
1185 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
1186
1187 dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true);
1188 if (IS_ERR(dst)) {
1189 err = PTR_ERR(dst);
1190 dst = NULL;
1191 goto out;
1192 }
1193
1194 if (hlimit < 0) {
1195 if (ipv6_addr_is_multicast(&fl6.daddr))
1196 hlimit = np->mcast_hops;
1197 else
1198 hlimit = np->hop_limit;
1199 if (hlimit < 0)
1200 hlimit = ip6_dst_hoplimit(dst);
1201 }
1202
1203 if (tclass < 0)
1204 tclass = np->tclass;
1205
1206 if (dontfrag < 0)
1207 dontfrag = np->dontfrag;
1208
1209 if (msg->msg_flags&MSG_CONFIRM)
1210 goto do_confirm;
1211 back_from_confirm:
1212
1213 lock_sock(sk);
1214 if (unlikely(up->pending)) {
1215 /* The socket is already corked while preparing it. */
1216 /* ... which is an evident application bug. --ANK */
1217 release_sock(sk);
1218
1219 LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
1220 err = -EINVAL;
1221 goto out;
1222 }
1223
1224 up->pending = AF_INET6;
1225
1226 do_append_data:
1227 up->len += ulen;
1228 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
1229 err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen,
1230 sizeof(struct udphdr), hlimit, tclass, opt, &fl6,
1231 (struct rt6_info*)dst,
1232 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag);
1233 if (err)
1234 udp_v6_flush_pending_frames(sk);
1235 else if (!corkreq)
1236 err = udp_v6_push_pending_frames(sk);
1237 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1238 up->pending = 0;
1239
1240 if (dst) {
1241 if (connected) {
1242 ip6_dst_store(sk, dst,
1243 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
1244 &np->daddr : NULL,
1245 #ifdef CONFIG_IPV6_SUBTREES
1246 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
1247 &np->saddr :
1248 #endif
1249 NULL);
1250 } else {
1251 dst_release(dst);
1252 }
1253 dst = NULL;
1254 }
1255
1256 if (err > 0)
1257 err = np->recverr ? net_xmit_errno(err) : 0;
1258 release_sock(sk);
1259 out:
1260 dst_release(dst);
1261 fl6_sock_release(flowlabel);
1262 if (!err)
1263 return len;
1264 /*
1265 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
1266 * ENOBUFS might not be good (it's not tunable per se), but otherwise
1267 * we don't have a good statistic (IpOutDiscards but it can be too many
1268 * things). We could add another new stat but at least for now that
1269 * seems like overkill.
1270 */
1271 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1272 UDP6_INC_STATS_USER(sock_net(sk),
1273 UDP_MIB_SNDBUFERRORS, is_udplite);
1274 }
1275 return err;
1276
1277 do_confirm:
1278 dst_confirm(dst);
1279 if (!(msg->msg_flags&MSG_PROBE) || len)
1280 goto back_from_confirm;
1281 err = 0;
1282 goto out;
1283 }
1284
1285 void udpv6_destroy_sock(struct sock *sk)
1286 {
1287 lock_sock(sk);
1288 udp_v6_flush_pending_frames(sk);
1289 release_sock(sk);
1290
1291 inet6_destroy_sock(sk);
1292 }
1293
1294 /*
1295 * Socket option code for UDP
1296 */
1297 int udpv6_setsockopt(struct sock *sk, int level, int optname,
1298 char __user *optval, unsigned int optlen)
1299 {
1300 if (level == SOL_UDP || level == SOL_UDPLITE)
1301 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1302 udp_v6_push_pending_frames);
1303 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1304 }
1305
1306 #ifdef CONFIG_COMPAT
1307 int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
1308 char __user *optval, unsigned int optlen)
1309 {
1310 if (level == SOL_UDP || level == SOL_UDPLITE)
1311 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
1312 udp_v6_push_pending_frames);
1313 return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
1314 }
1315 #endif
1316
1317 int udpv6_getsockopt(struct sock *sk, int level, int optname,
1318 char __user *optval, int __user *optlen)
1319 {
1320 if (level == SOL_UDP || level == SOL_UDPLITE)
1321 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1322 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1323 }
1324
1325 #ifdef CONFIG_COMPAT
1326 int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
1327 char __user *optval, int __user *optlen)
1328 {
1329 if (level == SOL_UDP || level == SOL_UDPLITE)
1330 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
1331 return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
1332 }
1333 #endif
1334
1335 static int udp6_ufo_send_check(struct sk_buff *skb)
1336 {
1337 const struct ipv6hdr *ipv6h;
1338 struct udphdr *uh;
1339
1340 if (!pskb_may_pull(skb, sizeof(*uh)))
1341 return -EINVAL;
1342
1343 ipv6h = ipv6_hdr(skb);
1344 uh = udp_hdr(skb);
1345
1346 uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
1347 IPPROTO_UDP, 0);
1348 skb->csum_start = skb_transport_header(skb) - skb->head;
1349 skb->csum_offset = offsetof(struct udphdr, check);
1350 skb->ip_summed = CHECKSUM_PARTIAL;
1351 return 0;
1352 }
1353
1354 static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
1355 netdev_features_t features)
1356 {
1357 struct sk_buff *segs = ERR_PTR(-EINVAL);
1358 unsigned int mss;
1359 unsigned int unfrag_ip6hlen, unfrag_len;
1360 struct frag_hdr *fptr;
1361 u8 *mac_start, *prevhdr;
1362 u8 nexthdr;
1363 u8 frag_hdr_sz = sizeof(struct frag_hdr);
1364 int offset;
1365 __wsum csum;
1366
1367 mss = skb_shinfo(skb)->gso_size;
1368 if (unlikely(skb->len <= mss))
1369 goto out;
1370
1371 if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
1372 /* Packet is from an untrusted source, reset gso_segs. */
1373 int type = skb_shinfo(skb)->gso_type;
1374
1375 if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
1376 !(type & (SKB_GSO_UDP))))
1377 goto out;
1378
1379 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
1380
1381 segs = NULL;
1382 goto out;
1383 }
1384
1385 /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
1386 * do checksum of UDP packets sent as multiple IP fragments.
1387 */
1388 offset = skb_checksum_start_offset(skb);
1389 csum = skb_checksum(skb, offset, skb->len - offset, 0);
1390 offset += skb->csum_offset;
1391 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
1392 skb->ip_summed = CHECKSUM_NONE;
1393
1394 /* Check if there is enough headroom to insert fragment header. */
1395 if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) &&
1396 pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC))
1397 goto out;
1398
1399 /* Find the unfragmentable header and shift it left by frag_hdr_sz
1400 * bytes to insert fragment header.
1401 */
1402 unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
1403 nexthdr = *prevhdr;
1404 *prevhdr = NEXTHDR_FRAGMENT;
1405 unfrag_len = skb_network_header(skb) - skb_mac_header(skb) +
1406 unfrag_ip6hlen;
1407 mac_start = skb_mac_header(skb);
1408 memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len);
1409
1410 skb->mac_header -= frag_hdr_sz;
1411 skb->network_header -= frag_hdr_sz;
1412
1413 fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen);
1414 fptr->nexthdr = nexthdr;
1415 fptr->reserved = 0;
1416 ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb));
1417
1418 /* Fragment the skb. ipv6 header and the remaining fields of the
1419 * fragment header are updated in ipv6_gso_segment()
1420 */
1421 segs = skb_segment(skb, features);
1422
1423 out:
1424 return segs;
1425 }
1426
1427 static const struct inet6_protocol udpv6_protocol = {
1428 .handler = udpv6_rcv,
1429 .err_handler = udpv6_err,
1430 .gso_send_check = udp6_ufo_send_check,
1431 .gso_segment = udp6_ufo_fragment,
1432 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1433 };
1434
1435 /* ------------------------------------------------------------------------ */
1436 #ifdef CONFIG_PROC_FS
1437
1438 static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket)
1439 {
1440 struct inet_sock *inet = inet_sk(sp);
1441 struct ipv6_pinfo *np = inet6_sk(sp);
1442 const struct in6_addr *dest, *src;
1443 __u16 destp, srcp;
1444
1445 dest = &np->daddr;
1446 src = &np->rcv_saddr;
1447 destp = ntohs(inet->inet_dport);
1448 srcp = ntohs(inet->inet_sport);
1449 seq_printf(seq,
1450 "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X "
1451 "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n",
1452 bucket,
1453 src->s6_addr32[0], src->s6_addr32[1],
1454 src->s6_addr32[2], src->s6_addr32[3], srcp,
1455 dest->s6_addr32[0], dest->s6_addr32[1],
1456 dest->s6_addr32[2], dest->s6_addr32[3], destp,
1457 sp->sk_state,
1458 sk_wmem_alloc_get(sp),
1459 sk_rmem_alloc_get(sp),
1460 0, 0L, 0,
1461 sock_i_uid(sp), 0,
1462 sock_i_ino(sp),
1463 atomic_read(&sp->sk_refcnt), sp,
1464 atomic_read(&sp->sk_drops));
1465 }
1466
1467 int udp6_seq_show(struct seq_file *seq, void *v)
1468 {
1469 if (v == SEQ_START_TOKEN)
1470 seq_printf(seq,
1471 " sl "
1472 "local_address "
1473 "remote_address "
1474 "st tx_queue rx_queue tr tm->when retrnsmt"
1475 " uid timeout inode ref pointer drops\n");
1476 else
1477 udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket);
1478 return 0;
1479 }
1480
1481 static const struct file_operations udp6_afinfo_seq_fops = {
1482 .owner = THIS_MODULE,
1483 .open = udp_seq_open,
1484 .read = seq_read,
1485 .llseek = seq_lseek,
1486 .release = seq_release_net
1487 };
1488
1489 static struct udp_seq_afinfo udp6_seq_afinfo = {
1490 .name = "udp6",
1491 .family = AF_INET6,
1492 .udp_table = &udp_table,
1493 .seq_fops = &udp6_afinfo_seq_fops,
1494 .seq_ops = {
1495 .show = udp6_seq_show,
1496 },
1497 };
1498
1499 int __net_init udp6_proc_init(struct net *net)
1500 {
1501 return udp_proc_register(net, &udp6_seq_afinfo);
1502 }
1503
1504 void udp6_proc_exit(struct net *net) {
1505 udp_proc_unregister(net, &udp6_seq_afinfo);
1506 }
1507 #endif /* CONFIG_PROC_FS */
1508
1509 /* ------------------------------------------------------------------------ */
1510
1511 struct proto udpv6_prot = {
1512 .name = "UDPv6",
1513 .owner = THIS_MODULE,
1514 .close = udp_lib_close,
1515 .connect = ip6_datagram_connect,
1516 .disconnect = udp_disconnect,
1517 .ioctl = udp_ioctl,
1518 .destroy = udpv6_destroy_sock,
1519 .setsockopt = udpv6_setsockopt,
1520 .getsockopt = udpv6_getsockopt,
1521 .sendmsg = udpv6_sendmsg,
1522 .recvmsg = udpv6_recvmsg,
1523 .backlog_rcv = __udpv6_queue_rcv_skb,
1524 .hash = udp_lib_hash,
1525 .unhash = udp_lib_unhash,
1526 .rehash = udp_v6_rehash,
1527 .get_port = udp_v6_get_port,
1528 .memory_allocated = &udp_memory_allocated,
1529 .sysctl_mem = sysctl_udp_mem,
1530 .sysctl_wmem = &sysctl_udp_wmem_min,
1531 .sysctl_rmem = &sysctl_udp_rmem_min,
1532 .obj_size = sizeof(struct udp6_sock),
1533 .slab_flags = SLAB_DESTROY_BY_RCU,
1534 .h.udp_table = &udp_table,
1535 #ifdef CONFIG_COMPAT
1536 .compat_setsockopt = compat_udpv6_setsockopt,
1537 .compat_getsockopt = compat_udpv6_getsockopt,
1538 #endif
1539 .clear_sk = sk_prot_clear_portaddr_nulls,
1540 };
1541
1542 static struct inet_protosw udpv6_protosw = {
1543 .type = SOCK_DGRAM,
1544 .protocol = IPPROTO_UDP,
1545 .prot = &udpv6_prot,
1546 .ops = &inet6_dgram_ops,
1547 .no_check = UDP_CSUM_DEFAULT,
1548 .flags = INET_PROTOSW_PERMANENT,
1549 };
1550
1551
1552 int __init udpv6_init(void)
1553 {
1554 int ret;
1555
1556 ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP);
1557 if (ret)
1558 goto out;
1559
1560 ret = inet6_register_protosw(&udpv6_protosw);
1561 if (ret)
1562 goto out_udpv6_protocol;
1563 out:
1564 return ret;
1565
1566 out_udpv6_protocol:
1567 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1568 goto out;
1569 }
1570
1571 void udpv6_exit(void)
1572 {
1573 inet6_unregister_protosw(&udpv6_protosw);
1574 inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP);
1575 }
Linux kernel - Deliverables
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