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[ALSA] sound: maestro3.c fix shadowed variable warnings
[linux-2.6/mini2440.git] / net / ipv6 / ip6_output.c
blob0af2e055f883c626b17adb0b4cb2fb4141738ff1
1 /*
2 * IPv6 output functions
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: ip6_output.c,v 1.34 2002/02/01 22:01:04 davem Exp $
9 *
10 * Based on linux/net/ipv4/ip_output.c
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation; either version
15 * 2 of the License, or (at your option) any later version.
16 *
17 * Changes:
18 * A.N.Kuznetsov : airthmetics in fragmentation.
19 * extension headers are implemented.
20 * route changes now work.
21 * ip6_forward does not confuse sniffers.
22 * etc.
23 *
24 * H. von Brand : Added missing #include <linux/string.h>
25 * Imran Patel : frag id should be in NBO
26 * Kazunori MIYAZAWA @USAGI
27 * : add ip6_append_data and related functions
28 * for datagram xmit
29 */
30
31 #include <linux/errno.h>
32 #include <linux/kernel.h>
33 #include <linux/string.h>
34 #include <linux/socket.h>
35 #include <linux/net.h>
36 #include <linux/netdevice.h>
37 #include <linux/if_arp.h>
38 #include <linux/in6.h>
39 #include <linux/tcp.h>
40 #include <linux/route.h>
41 #include <linux/module.h>
42
43 #include <linux/netfilter.h>
44 #include <linux/netfilter_ipv6.h>
45
46 #include <net/sock.h>
47 #include <net/snmp.h>
48
49 #include <net/ipv6.h>
50 #include <net/ndisc.h>
51 #include <net/protocol.h>
52 #include <net/ip6_route.h>
53 #include <net/addrconf.h>
54 #include <net/rawv6.h>
55 #include <net/icmp.h>
56 #include <net/xfrm.h>
57 #include <net/checksum.h>
58 #include <linux/mroute6.h>
59
60 static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
61
62 static __inline__ void ipv6_select_ident(struct sk_buff *skb, struct frag_hdr *fhdr)
63 {
64 static u32 ipv6_fragmentation_id = 1;
65 static DEFINE_SPINLOCK(ip6_id_lock);
66
67 spin_lock_bh(&ip6_id_lock);
68 fhdr->identification = htonl(ipv6_fragmentation_id);
69 if (++ipv6_fragmentation_id == 0)
70 ipv6_fragmentation_id = 1;
71 spin_unlock_bh(&ip6_id_lock);
72 }
73
74 int __ip6_local_out(struct sk_buff *skb)
75 {
76 int len;
77
78 len = skb->len - sizeof(struct ipv6hdr);
79 if (len > IPV6_MAXPLEN)
80 len = 0;
81 ipv6_hdr(skb)->payload_len = htons(len);
82
83 return nf_hook(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, skb->dst->dev,
84 dst_output);
85 }
86
87 int ip6_local_out(struct sk_buff *skb)
88 {
89 int err;
90
91 err = __ip6_local_out(skb);
92 if (likely(err == 1))
93 err = dst_output(skb);
94
95 return err;
96 }
97 EXPORT_SYMBOL_GPL(ip6_local_out);
98
99 static int ip6_output_finish(struct sk_buff *skb)
100 {
101 struct dst_entry *dst = skb->dst;
102
103 if (dst->hh)
104 return neigh_hh_output(dst->hh, skb);
105 else if (dst->neighbour)
106 return dst->neighbour->output(skb);
107
108 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);
109 kfree_skb(skb);
110 return -EINVAL;
111
112 }
113
114 /* dev_loopback_xmit for use with netfilter. */
115 static int ip6_dev_loopback_xmit(struct sk_buff *newskb)
116 {
117 skb_reset_mac_header(newskb);
118 __skb_pull(newskb, skb_network_offset(newskb));
119 newskb->pkt_type = PACKET_LOOPBACK;
120 newskb->ip_summed = CHECKSUM_UNNECESSARY;
121 BUG_TRAP(newskb->dst);
122
123 netif_rx(newskb);
124 return 0;
125 }
126
127
128 static int ip6_output2(struct sk_buff *skb)
129 {
130 struct dst_entry *dst = skb->dst;
131 struct net_device *dev = dst->dev;
132
133 skb->protocol = htons(ETH_P_IPV6);
134 skb->dev = dev;
135
136 if (ipv6_addr_is_multicast(&ipv6_hdr(skb)->daddr)) {
137 struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL;
138 struct inet6_dev *idev = ip6_dst_idev(skb->dst);
139
140 if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) &&
141 ((mroute6_socket && !(IP6CB(skb)->flags & IP6SKB_FORWARDED)) ||
142 ipv6_chk_mcast_addr(dev, &ipv6_hdr(skb)->daddr,
143 &ipv6_hdr(skb)->saddr))) {
144 struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC);
145
146 /* Do not check for IFF_ALLMULTI; multicast routing
147 is not supported in any case.
148 */
149 if (newskb)
150 NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, newskb,
151 NULL, newskb->dev,
152 ip6_dev_loopback_xmit);
153
154 if (ipv6_hdr(skb)->hop_limit == 0) {
155 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS);
156 kfree_skb(skb);
157 return 0;
158 }
159 }
160
161 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS);
162 }
163
164 return NF_HOOK(PF_INET6, NF_INET_POST_ROUTING, skb, NULL, skb->dev,
165 ip6_output_finish);
166 }
167
168 static inline int ip6_skb_dst_mtu(struct sk_buff *skb)
169 {
170 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
171
172 return (np && np->pmtudisc == IPV6_PMTUDISC_PROBE) ?
173 skb->dst->dev->mtu : dst_mtu(skb->dst);
174 }
175
176 int ip6_output(struct sk_buff *skb)
177 {
178 if ((skb->len > ip6_skb_dst_mtu(skb) && !skb_is_gso(skb)) ||
179 dst_allfrag(skb->dst))
180 return ip6_fragment(skb, ip6_output2);
181 else
182 return ip6_output2(skb);
183 }
184
185 /*
186 * xmit an sk_buff (used by TCP)
187 */
188
189 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl,
190 struct ipv6_txoptions *opt, int ipfragok)
191 {
192 struct ipv6_pinfo *np = inet6_sk(sk);
193 struct in6_addr *first_hop = &fl->fl6_dst;
194 struct dst_entry *dst = skb->dst;
195 struct ipv6hdr *hdr;
196 u8 proto = fl->proto;
197 int seg_len = skb->len;
198 int hlimit, tclass;
199 u32 mtu;
200
201 if (opt) {
202 unsigned int head_room;
203
204 /* First: exthdrs may take lots of space (~8K for now)
205 MAX_HEADER is not enough.
206 */
207 head_room = opt->opt_nflen + opt->opt_flen;
208 seg_len += head_room;
209 head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev);
210
211 if (skb_headroom(skb) < head_room) {
212 struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room);
213 if (skb2 == NULL) {
214 IP6_INC_STATS(ip6_dst_idev(skb->dst),
215 IPSTATS_MIB_OUTDISCARDS);
216 kfree_skb(skb);
217 return -ENOBUFS;
218 }
219 kfree_skb(skb);
220 skb = skb2;
221 if (sk)
222 skb_set_owner_w(skb, sk);
223 }
224 if (opt->opt_flen)
225 ipv6_push_frag_opts(skb, opt, &proto);
226 if (opt->opt_nflen)
227 ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop);
228 }
229
230 skb_push(skb, sizeof(struct ipv6hdr));
231 skb_reset_network_header(skb);
232 hdr = ipv6_hdr(skb);
233
234 /*
235 * Fill in the IPv6 header
236 */
237
238 hlimit = -1;
239 if (np)
240 hlimit = np->hop_limit;
241 if (hlimit < 0)
242 hlimit = ip6_dst_hoplimit(dst);
243
244 tclass = -1;
245 if (np)
246 tclass = np->tclass;
247 if (tclass < 0)
248 tclass = 0;
249
250 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel;
251
252 hdr->payload_len = htons(seg_len);
253 hdr->nexthdr = proto;
254 hdr->hop_limit = hlimit;
255
256 ipv6_addr_copy(&hdr->saddr, &fl->fl6_src);
257 ipv6_addr_copy(&hdr->daddr, first_hop);
258
259 skb->priority = sk->sk_priority;
260 skb->mark = sk->sk_mark;
261
262 mtu = dst_mtu(dst);
263 if ((skb->len <= mtu) || ipfragok || skb_is_gso(skb)) {
264 IP6_INC_STATS(ip6_dst_idev(skb->dst),
265 IPSTATS_MIB_OUTREQUESTS);
266 return NF_HOOK(PF_INET6, NF_INET_LOCAL_OUT, skb, NULL, dst->dev,
267 dst_output);
268 }
269
270 if (net_ratelimit())
271 printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n");
272 skb->dev = dst->dev;
273 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
274 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
275 kfree_skb(skb);
276 return -EMSGSIZE;
277 }
278
279 EXPORT_SYMBOL(ip6_xmit);
280
281 /*
282 * To avoid extra problems ND packets are send through this
283 * routine. It's code duplication but I really want to avoid
284 * extra checks since ipv6_build_header is used by TCP (which
285 * is for us performance critical)
286 */
287
288 int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev,
289 const struct in6_addr *saddr, const struct in6_addr *daddr,
290 int proto, int len)
291 {
292 struct ipv6_pinfo *np = inet6_sk(sk);
293 struct ipv6hdr *hdr;
294 int totlen;
295
296 skb->protocol = htons(ETH_P_IPV6);
297 skb->dev = dev;
298
299 totlen = len + sizeof(struct ipv6hdr);
300
301 skb_reset_network_header(skb);
302 skb_put(skb, sizeof(struct ipv6hdr));
303 hdr = ipv6_hdr(skb);
304
305 *(__be32*)hdr = htonl(0x60000000);
306
307 hdr->payload_len = htons(len);
308 hdr->nexthdr = proto;
309 hdr->hop_limit = np->hop_limit;
310
311 ipv6_addr_copy(&hdr->saddr, saddr);
312 ipv6_addr_copy(&hdr->daddr, daddr);
313
314 return 0;
315 }
316
317 static int ip6_call_ra_chain(struct sk_buff *skb, int sel)
318 {
319 struct ip6_ra_chain *ra;
320 struct sock *last = NULL;
321
322 read_lock(&ip6_ra_lock);
323 for (ra = ip6_ra_chain; ra; ra = ra->next) {
324 struct sock *sk = ra->sk;
325 if (sk && ra->sel == sel &&
326 (!sk->sk_bound_dev_if ||
327 sk->sk_bound_dev_if == skb->dev->ifindex)) {
328 if (last) {
329 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
330 if (skb2)
331 rawv6_rcv(last, skb2);
332 }
333 last = sk;
334 }
335 }
336
337 if (last) {
338 rawv6_rcv(last, skb);
339 read_unlock(&ip6_ra_lock);
340 return 1;
341 }
342 read_unlock(&ip6_ra_lock);
343 return 0;
344 }
345
346 static int ip6_forward_proxy_check(struct sk_buff *skb)
347 {
348 struct ipv6hdr *hdr = ipv6_hdr(skb);
349 u8 nexthdr = hdr->nexthdr;
350 int offset;
351
352 if (ipv6_ext_hdr(nexthdr)) {
353 offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr);
354 if (offset < 0)
355 return 0;
356 } else
357 offset = sizeof(struct ipv6hdr);
358
359 if (nexthdr == IPPROTO_ICMPV6) {
360 struct icmp6hdr *icmp6;
361
362 if (!pskb_may_pull(skb, (skb_network_header(skb) +
363 offset + 1 - skb->data)))
364 return 0;
365
366 icmp6 = (struct icmp6hdr *)(skb_network_header(skb) + offset);
367
368 switch (icmp6->icmp6_type) {
369 case NDISC_ROUTER_SOLICITATION:
370 case NDISC_ROUTER_ADVERTISEMENT:
371 case NDISC_NEIGHBOUR_SOLICITATION:
372 case NDISC_NEIGHBOUR_ADVERTISEMENT:
373 case NDISC_REDIRECT:
374 /* For reaction involving unicast neighbor discovery
375 * message destined to the proxied address, pass it to
376 * input function.
377 */
378 return 1;
379 default:
380 break;
381 }
382 }
383
384 /*
385 * The proxying router can't forward traffic sent to a link-local
386 * address, so signal the sender and discard the packet. This
387 * behavior is clarified by the MIPv6 specification.
388 */
389 if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) {
390 dst_link_failure(skb);
391 return -1;
392 }
393
394 return 0;
395 }
396
397 static inline int ip6_forward_finish(struct sk_buff *skb)
398 {
399 return dst_output(skb);
400 }
401
402 int ip6_forward(struct sk_buff *skb)
403 {
404 struct dst_entry *dst = skb->dst;
405 struct ipv6hdr *hdr = ipv6_hdr(skb);
406 struct inet6_skb_parm *opt = IP6CB(skb);
407 struct net *net = dev_net(dst->dev);
408
409 if (ipv6_devconf.forwarding == 0)
410 goto error;
411
412 if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) {
413 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
414 goto drop;
415 }
416
417 skb_forward_csum(skb);
418
419 /*
420 * We DO NOT make any processing on
421 * RA packets, pushing them to user level AS IS
422 * without ane WARRANTY that application will be able
423 * to interpret them. The reason is that we
424 * cannot make anything clever here.
425 *
426 * We are not end-node, so that if packet contains
427 * AH/ESP, we cannot make anything.
428 * Defragmentation also would be mistake, RA packets
429 * cannot be fragmented, because there is no warranty
430 * that different fragments will go along one path. --ANK
431 */
432 if (opt->ra) {
433 u8 *ptr = skb_network_header(skb) + opt->ra;
434 if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3]))
435 return 0;
436 }
437
438 /*
439 * check and decrement ttl
440 */
441 if (hdr->hop_limit <= 1) {
442 /* Force OUTPUT device used as source address */
443 skb->dev = dst->dev;
444 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT,
445 0, skb->dev);
446 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS);
447
448 kfree_skb(skb);
449 return -ETIMEDOUT;
450 }
451
452 /* XXX: idev->cnf.proxy_ndp? */
453 if (ipv6_devconf.proxy_ndp &&
454 pneigh_lookup(&nd_tbl, net, &hdr->daddr, skb->dev, 0)) {
455 int proxied = ip6_forward_proxy_check(skb);
456 if (proxied > 0)
457 return ip6_input(skb);
458 else if (proxied < 0) {
459 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
460 goto drop;
461 }
462 }
463
464 if (!xfrm6_route_forward(skb)) {
465 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS);
466 goto drop;
467 }
468 dst = skb->dst;
469
470 /* IPv6 specs say nothing about it, but it is clear that we cannot
471 send redirects to source routed frames.
472 We don't send redirects to frames decapsulated from IPsec.
473 */
474 if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0 &&
475 !skb->sp) {
476 struct in6_addr *target = NULL;
477 struct rt6_info *rt;
478 struct neighbour *n = dst->neighbour;
479
480 /*
481 * incoming and outgoing devices are the same
482 * send a redirect.
483 */
484
485 rt = (struct rt6_info *) dst;
486 if ((rt->rt6i_flags & RTF_GATEWAY))
487 target = (struct in6_addr*)&n->primary_key;
488 else
489 target = &hdr->daddr;
490
491 /* Limit redirects both by destination (here)
492 and by source (inside ndisc_send_redirect)
493 */
494 if (xrlim_allow(dst, 1*HZ))
495 ndisc_send_redirect(skb, n, target);
496 } else {
497 int addrtype = ipv6_addr_type(&hdr->saddr);
498
499 /* This check is security critical. */
500 if (addrtype & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK))
501 goto error;
502 if (addrtype & IPV6_ADDR_LINKLOCAL) {
503 icmpv6_send(skb, ICMPV6_DEST_UNREACH,
504 ICMPV6_NOT_NEIGHBOUR, 0, skb->dev);
505 goto error;
506 }
507 }
508
509 if (skb->len > dst_mtu(dst)) {
510 /* Again, force OUTPUT device used as source address */
511 skb->dev = dst->dev;
512 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev);
513 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS);
514 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS);
515 kfree_skb(skb);
516 return -EMSGSIZE;
517 }
518
519 if (skb_cow(skb, dst->dev->hard_header_len)) {
520 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS);
521 goto drop;
522 }
523
524 hdr = ipv6_hdr(skb);
525
526 /* Mangling hops number delayed to point after skb COW */
527
528 hdr->hop_limit--;
529
530 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS);
531 return NF_HOOK(PF_INET6, NF_INET_FORWARD, skb, skb->dev, dst->dev,
532 ip6_forward_finish);
533
534 error:
535 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS);
536 drop:
537 kfree_skb(skb);
538 return -EINVAL;
539 }
540
541 static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from)
542 {
543 to->pkt_type = from->pkt_type;
544 to->priority = from->priority;
545 to->protocol = from->protocol;
546 dst_release(to->dst);
547 to->dst = dst_clone(from->dst);
548 to->dev = from->dev;
549 to->mark = from->mark;
550
551 #ifdef CONFIG_NET_SCHED
552 to->tc_index = from->tc_index;
553 #endif
554 nf_copy(to, from);
555 #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
556 defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
557 to->nf_trace = from->nf_trace;
558 #endif
559 skb_copy_secmark(to, from);
560 }
561
562 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
563 {
564 u16 offset = sizeof(struct ipv6hdr);
565 struct ipv6_opt_hdr *exthdr =
566 (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
567 unsigned int packet_len = skb->tail - skb->network_header;
568 int found_rhdr = 0;
569 *nexthdr = &ipv6_hdr(skb)->nexthdr;
570
571 while (offset + 1 <= packet_len) {
572
573 switch (**nexthdr) {
574
575 case NEXTHDR_HOP:
576 break;
577 case NEXTHDR_ROUTING:
578 found_rhdr = 1;
579 break;
580 case NEXTHDR_DEST:
581 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
582 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
583 break;
584 #endif
585 if (found_rhdr)
586 return offset;
587 break;
588 default :
589 return offset;
590 }
591
592 offset += ipv6_optlen(exthdr);
593 *nexthdr = &exthdr->nexthdr;
594 exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
595 offset);
596 }
597
598 return offset;
599 }
600
601 static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
602 {
603 struct net_device *dev;
604 struct sk_buff *frag;
605 struct rt6_info *rt = (struct rt6_info*)skb->dst;
606 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL;
607 struct ipv6hdr *tmp_hdr;
608 struct frag_hdr *fh;
609 unsigned int mtu, hlen, left, len;
610 __be32 frag_id = 0;
611 int ptr, offset = 0, err=0;
612 u8 *prevhdr, nexthdr = 0;
613
614 dev = rt->u.dst.dev;
615 hlen = ip6_find_1stfragopt(skb, &prevhdr);
616 nexthdr = *prevhdr;
617
618 mtu = ip6_skb_dst_mtu(skb);
619
620 /* We must not fragment if the socket is set to force MTU discovery
621 * or if the skb it not generated by a local socket. (This last
622 * check should be redundant, but it's free.)
623 */
624 if (!skb->local_df) {
625 skb->dev = skb->dst->dev;
626 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev);
627 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
628 kfree_skb(skb);
629 return -EMSGSIZE;
630 }
631
632 if (np && np->frag_size < mtu) {
633 if (np->frag_size)
634 mtu = np->frag_size;
635 }
636 mtu -= hlen + sizeof(struct frag_hdr);
637
638 if (skb_shinfo(skb)->frag_list) {
639 int first_len = skb_pagelen(skb);
640 int truesizes = 0;
641
642 if (first_len - hlen > mtu ||
643 ((first_len - hlen) & 7) ||
644 skb_cloned(skb))
645 goto slow_path;
646
647 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) {
648 /* Correct geometry. */
649 if (frag->len > mtu ||
650 ((frag->len & 7) && frag->next) ||
651 skb_headroom(frag) < hlen)
652 goto slow_path;
653
654 /* Partially cloned skb? */
655 if (skb_shared(frag))
656 goto slow_path;
657
658 BUG_ON(frag->sk);
659 if (skb->sk) {
660 sock_hold(skb->sk);
661 frag->sk = skb->sk;
662 frag->destructor = sock_wfree;
663 truesizes += frag->truesize;
664 }
665 }
666
667 err = 0;
668 offset = 0;
669 frag = skb_shinfo(skb)->frag_list;
670 skb_shinfo(skb)->frag_list = NULL;
671 /* BUILD HEADER */
672
673 *prevhdr = NEXTHDR_FRAGMENT;
674 tmp_hdr = kmemdup(skb_network_header(skb), hlen, GFP_ATOMIC);
675 if (!tmp_hdr) {
676 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS);
677 return -ENOMEM;
678 }
679
680 __skb_pull(skb, hlen);
681 fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr));
682 __skb_push(skb, hlen);
683 skb_reset_network_header(skb);
684 memcpy(skb_network_header(skb), tmp_hdr, hlen);
685
686 ipv6_select_ident(skb, fh);
687 fh->nexthdr = nexthdr;
688 fh->reserved = 0;
689 fh->frag_off = htons(IP6_MF);
690 frag_id = fh->identification;
691
692 first_len = skb_pagelen(skb);
693 skb->data_len = first_len - skb_headlen(skb);
694 skb->truesize -= truesizes;
695 skb->len = first_len;
696 ipv6_hdr(skb)->payload_len = htons(first_len -
697 sizeof(struct ipv6hdr));
698
699 dst_hold(&rt->u.dst);
700
701 for (;;) {
702 /* Prepare header of the next frame,
703 * before previous one went down. */
704 if (frag) {
705 frag->ip_summed = CHECKSUM_NONE;
706 skb_reset_transport_header(frag);
707 fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr));
708 __skb_push(frag, hlen);
709 skb_reset_network_header(frag);
710 memcpy(skb_network_header(frag), tmp_hdr,
711 hlen);
712 offset += skb->len - hlen - sizeof(struct frag_hdr);
713 fh->nexthdr = nexthdr;
714 fh->reserved = 0;
715 fh->frag_off = htons(offset);
716 if (frag->next != NULL)
717 fh->frag_off |= htons(IP6_MF);
718 fh->identification = frag_id;
719 ipv6_hdr(frag)->payload_len =
720 htons(frag->len -
721 sizeof(struct ipv6hdr));
722 ip6_copy_metadata(frag, skb);
723 }
724
725 err = output(skb);
726 if(!err)
727 IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGCREATES);
728
729 if (err || !frag)
730 break;
731
732 skb = frag;
733 frag = skb->next;
734 skb->next = NULL;
735 }
736
737 kfree(tmp_hdr);
738
739 if (err == 0) {
740 IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGOKS);
741 dst_release(&rt->u.dst);
742 return 0;
743 }
744
745 while (frag) {
746 skb = frag->next;
747 kfree_skb(frag);
748 frag = skb;
749 }
750
751 IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGFAILS);
752 dst_release(&rt->u.dst);
753 return err;
754 }
755
756 slow_path:
757 left = skb->len - hlen; /* Space per frame */
758 ptr = hlen; /* Where to start from */
759
760 /*
761 * Fragment the datagram.
762 */
763
764 *prevhdr = NEXTHDR_FRAGMENT;
765
766 /*
767 * Keep copying data until we run out.
768 */
769 while(left > 0) {
770 len = left;
771 /* IF: it doesn't fit, use 'mtu' - the data space left */
772 if (len > mtu)
773 len = mtu;
774 /* IF: we are not sending upto and including the packet end
775 then align the next start on an eight byte boundary */
776 if (len < left) {
777 len &= ~7;
778 }
779 /*
780 * Allocate buffer.
781 */
782
783 if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_RESERVED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) {
784 NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n");
785 IP6_INC_STATS(ip6_dst_idev(skb->dst),
786 IPSTATS_MIB_FRAGFAILS);
787 err = -ENOMEM;
788 goto fail;
789 }
790
791 /*
792 * Set up data on packet
793 */
794
795 ip6_copy_metadata(frag, skb);
796 skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev));
797 skb_put(frag, len + hlen + sizeof(struct frag_hdr));
798 skb_reset_network_header(frag);
799 fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
800 frag->transport_header = (frag->network_header + hlen +
801 sizeof(struct frag_hdr));
802
803 /*
804 * Charge the memory for the fragment to any owner
805 * it might possess
806 */
807 if (skb->sk)
808 skb_set_owner_w(frag, skb->sk);
809
810 /*
811 * Copy the packet header into the new buffer.
812 */
813 skb_copy_from_linear_data(skb, skb_network_header(frag), hlen);
814
815 /*
816 * Build fragment header.
817 */
818 fh->nexthdr = nexthdr;
819 fh->reserved = 0;
820 if (!frag_id) {
821 ipv6_select_ident(skb, fh);
822 frag_id = fh->identification;
823 } else
824 fh->identification = frag_id;
825
826 /*
827 * Copy a block of the IP datagram.
828 */
829 if (skb_copy_bits(skb, ptr, skb_transport_header(frag), len))
830 BUG();
831 left -= len;
832
833 fh->frag_off = htons(offset);
834 if (left > 0)
835 fh->frag_off |= htons(IP6_MF);
836 ipv6_hdr(frag)->payload_len = htons(frag->len -
837 sizeof(struct ipv6hdr));
838
839 ptr += len;
840 offset += len;
841
842 /*
843 * Put this fragment into the sending queue.
844 */
845 err = output(frag);
846 if (err)
847 goto fail;
848
849 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGCREATES);
850 }
851 IP6_INC_STATS(ip6_dst_idev(skb->dst),
852 IPSTATS_MIB_FRAGOKS);
853 kfree_skb(skb);
854 return err;
855
856 fail:
857 IP6_INC_STATS(ip6_dst_idev(skb->dst),
858 IPSTATS_MIB_FRAGFAILS);
859 kfree_skb(skb);
860 return err;
861 }
862
863 static inline int ip6_rt_check(struct rt6key *rt_key,
864 struct in6_addr *fl_addr,
865 struct in6_addr *addr_cache)
866 {
867 return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) &&
868 (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache)));
869 }
870
871 static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
872 struct dst_entry *dst,
873 struct flowi *fl)
874 {
875 struct ipv6_pinfo *np = inet6_sk(sk);
876 struct rt6_info *rt = (struct rt6_info *)dst;
877
878 if (!dst)
879 goto out;
880
881 /* Yes, checking route validity in not connected
882 * case is not very simple. Take into account,
883 * that we do not support routing by source, TOS,
884 * and MSG_DONTROUTE --ANK (980726)
885 *
886 * 1. ip6_rt_check(): If route was host route,
887 * check that cached destination is current.
888 * If it is network route, we still may
889 * check its validity using saved pointer
890 * to the last used address: daddr_cache.
891 * We do not want to save whole address now,
892 * (because main consumer of this service
893 * is tcp, which has not this problem),
894 * so that the last trick works only on connected
895 * sockets.
896 * 2. oif also should be the same.
897 */
898 if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) ||
899 #ifdef CONFIG_IPV6_SUBTREES
900 ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) ||
901 #endif
902 (fl->oif && fl->oif != dst->dev->ifindex)) {
903 dst_release(dst);
904 dst = NULL;
905 }
906
907 out:
908 return dst;
909 }
910
911 static int ip6_dst_lookup_tail(struct sock *sk,
912 struct dst_entry **dst, struct flowi *fl)
913 {
914 int err;
915 struct net *net = sock_net(sk);
916
917 if (*dst == NULL)
918 *dst = ip6_route_output(net, sk, fl);
919
920 if ((err = (*dst)->error))
921 goto out_err_release;
922
923 if (ipv6_addr_any(&fl->fl6_src)) {
924 err = ipv6_dev_get_saddr(ip6_dst_idev(*dst)->dev,
925 &fl->fl6_dst,
926 sk ? inet6_sk(sk)->srcprefs : 0,
927 &fl->fl6_src);
928 if (err)
929 goto out_err_release;
930 }
931
932 #ifdef CONFIG_IPV6_OPTIMISTIC_DAD
933 /*
934 * Here if the dst entry we've looked up
935 * has a neighbour entry that is in the INCOMPLETE
936 * state and the src address from the flow is
937 * marked as OPTIMISTIC, we release the found
938 * dst entry and replace it instead with the
939 * dst entry of the nexthop router
940 */
941 if (!((*dst)->neighbour->nud_state & NUD_VALID)) {
942 struct inet6_ifaddr *ifp;
943 struct flowi fl_gw;
944 int redirect;
945
946 ifp = ipv6_get_ifaddr(net, &fl->fl6_src,
947 (*dst)->dev, 1);
948
949 redirect = (ifp && ifp->flags & IFA_F_OPTIMISTIC);
950 if (ifp)
951 in6_ifa_put(ifp);
952
953 if (redirect) {
954 /*
955 * We need to get the dst entry for the
956 * default router instead
957 */
958 dst_release(*dst);
959 memcpy(&fl_gw, fl, sizeof(struct flowi));
960 memset(&fl_gw.fl6_dst, 0, sizeof(struct in6_addr));
961 *dst = ip6_route_output(net, sk, &fl_gw);
962 if ((err = (*dst)->error))
963 goto out_err_release;
964 }
965 }
966 #endif
967
968 return 0;
969
970 out_err_release:
971 if (err == -ENETUNREACH)
972 IP6_INC_STATS_BH(NULL, IPSTATS_MIB_OUTNOROUTES);
973 dst_release(*dst);
974 *dst = NULL;
975 return err;
976 }
977
978 /**
979 * ip6_dst_lookup - perform route lookup on flow
980 * @sk: socket which provides route info
981 * @dst: pointer to dst_entry * for result
982 * @fl: flow to lookup
983 *
984 * This function performs a route lookup on the given flow.
985 *
986 * It returns zero on success, or a standard errno code on error.
987 */
988 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
989 {
990 *dst = NULL;
991 return ip6_dst_lookup_tail(sk, dst, fl);
992 }
993 EXPORT_SYMBOL_GPL(ip6_dst_lookup);
994
995 /**
996 * ip6_sk_dst_lookup - perform socket cached route lookup on flow
997 * @sk: socket which provides the dst cache and route info
998 * @dst: pointer to dst_entry * for result
999 * @fl: flow to lookup
1000 *
1001 * This function performs a route lookup on the given flow with the
1002 * possibility of using the cached route in the socket if it is valid.
1003 * It will take the socket dst lock when operating on the dst cache.
1004 * As a result, this function can only be used in process context.
1005 *
1006 * It returns zero on success, or a standard errno code on error.
1007 */
1008 int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
1009 {
1010 *dst = NULL;
1011 if (sk) {
1012 *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
1013 *dst = ip6_sk_dst_check(sk, *dst, fl);
1014 }
1015
1016 return ip6_dst_lookup_tail(sk, dst, fl);
1017 }
1018 EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup);
1019
1020 static inline int ip6_ufo_append_data(struct sock *sk,
1021 int getfrag(void *from, char *to, int offset, int len,
1022 int odd, struct sk_buff *skb),
1023 void *from, int length, int hh_len, int fragheaderlen,
1024 int transhdrlen, int mtu,unsigned int flags)
1025
1026 {
1027 struct sk_buff *skb;
1028 int err;
1029
1030 /* There is support for UDP large send offload by network
1031 * device, so create one single skb packet containing complete
1032 * udp datagram
1033 */
1034 if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) {
1035 skb = sock_alloc_send_skb(sk,
1036 hh_len + fragheaderlen + transhdrlen + 20,
1037 (flags & MSG_DONTWAIT), &err);
1038 if (skb == NULL)
1039 return -ENOMEM;
1040
1041 /* reserve space for Hardware header */
1042 skb_reserve(skb, hh_len);
1043
1044 /* create space for UDP/IP header */
1045 skb_put(skb,fragheaderlen + transhdrlen);
1046
1047 /* initialize network header pointer */
1048 skb_reset_network_header(skb);
1049
1050 /* initialize protocol header pointer */
1051 skb->transport_header = skb->network_header + fragheaderlen;
1052
1053 skb->ip_summed = CHECKSUM_PARTIAL;
1054 skb->csum = 0;
1055 sk->sk_sndmsg_off = 0;
1056 }
1057
1058 err = skb_append_datato_frags(sk,skb, getfrag, from,
1059 (length - transhdrlen));
1060 if (!err) {
1061 struct frag_hdr fhdr;
1062
1063 /* specify the length of each IP datagram fragment*/
1064 skb_shinfo(skb)->gso_size = mtu - fragheaderlen -
1065 sizeof(struct frag_hdr);
1066 skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
1067 ipv6_select_ident(skb, &fhdr);
1068 skb_shinfo(skb)->ip6_frag_id = fhdr.identification;
1069 __skb_queue_tail(&sk->sk_write_queue, skb);
1070
1071 return 0;
1072 }
1073 /* There is not enough support do UPD LSO,
1074 * so follow normal path
1075 */
1076 kfree_skb(skb);
1077
1078 return err;
1079 }
1080
1081 int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to,
1082 int offset, int len, int odd, struct sk_buff *skb),
1083 void *from, int length, int transhdrlen,
1084 int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl,
1085 struct rt6_info *rt, unsigned int flags)
1086 {
1087 struct inet_sock *inet = inet_sk(sk);
1088 struct ipv6_pinfo *np = inet6_sk(sk);
1089 struct sk_buff *skb;
1090 unsigned int maxfraglen, fragheaderlen;
1091 int exthdrlen;
1092 int hh_len;
1093 int mtu;
1094 int copy;
1095 int err;
1096 int offset = 0;
1097 int csummode = CHECKSUM_NONE;
1098
1099 if (flags&MSG_PROBE)
1100 return 0;
1101 if (skb_queue_empty(&sk->sk_write_queue)) {
1102 /*
1103 * setup for corking
1104 */
1105 if (opt) {
1106 if (np->cork.opt == NULL) {
1107 np->cork.opt = kmalloc(opt->tot_len,
1108 sk->sk_allocation);
1109 if (unlikely(np->cork.opt == NULL))
1110 return -ENOBUFS;
1111 } else if (np->cork.opt->tot_len < opt->tot_len) {
1112 printk(KERN_DEBUG "ip6_append_data: invalid option length\n");
1113 return -EINVAL;
1114 }
1115 memcpy(np->cork.opt, opt, opt->tot_len);
1116 inet->cork.flags |= IPCORK_OPT;
1117 /* need source address above miyazawa*/
1118 }
1119 dst_hold(&rt->u.dst);
1120 inet->cork.dst = &rt->u.dst;
1121 inet->cork.fl = *fl;
1122 np->cork.hop_limit = hlimit;
1123 np->cork.tclass = tclass;
1124 mtu = np->pmtudisc == IPV6_PMTUDISC_PROBE ?
1125 rt->u.dst.dev->mtu : dst_mtu(rt->u.dst.path);
1126 if (np->frag_size < mtu) {
1127 if (np->frag_size)
1128 mtu = np->frag_size;
1129 }
1130 inet->cork.fragsize = mtu;
1131 if (dst_allfrag(rt->u.dst.path))
1132 inet->cork.flags |= IPCORK_ALLFRAG;
1133 inet->cork.length = 0;
1134 sk->sk_sndmsg_page = NULL;
1135 sk->sk_sndmsg_off = 0;
1136 exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0) -
1137 rt->rt6i_nfheader_len;
1138 length += exthdrlen;
1139 transhdrlen += exthdrlen;
1140 } else {
1141 rt = (struct rt6_info *)inet->cork.dst;
1142 fl = &inet->cork.fl;
1143 if (inet->cork.flags & IPCORK_OPT)
1144 opt = np->cork.opt;
1145 transhdrlen = 0;
1146 exthdrlen = 0;
1147 mtu = inet->cork.fragsize;
1148 }
1149
1150 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev);
1151
1152 fragheaderlen = sizeof(struct ipv6hdr) + rt->rt6i_nfheader_len +
1153 (opt ? opt->opt_nflen : 0);
1154 maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr);
1155
1156 if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) {
1157 if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) {
1158 ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen);
1159 return -EMSGSIZE;
1160 }
1161 }
1162
1163 /*
1164 * Let's try using as much space as possible.
1165 * Use MTU if total length of the message fits into the MTU.
1166 * Otherwise, we need to reserve fragment header and
1167 * fragment alignment (= 8-15 octects, in total).
1168 *
1169 * Note that we may need to "move" the data from the tail of
1170 * of the buffer to the new fragment when we split
1171 * the message.
1172 *
1173 * FIXME: It may be fragmented into multiple chunks
1174 * at once if non-fragmentable extension headers
1175 * are too large.
1176 * --yoshfuji
1177 */
1178
1179 inet->cork.length += length;
1180 if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) &&
1181 (rt->u.dst.dev->features & NETIF_F_UFO)) {
1182
1183 err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len,
1184 fragheaderlen, transhdrlen, mtu,
1185 flags);
1186 if (err)
1187 goto error;
1188 return 0;
1189 }
1190
1191 if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL)
1192 goto alloc_new_skb;
1193
1194 while (length > 0) {
1195 /* Check if the remaining data fits into current packet. */
1196 copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len;
1197 if (copy < length)
1198 copy = maxfraglen - skb->len;
1199
1200 if (copy <= 0) {
1201 char *data;
1202 unsigned int datalen;
1203 unsigned int fraglen;
1204 unsigned int fraggap;
1205 unsigned int alloclen;
1206 struct sk_buff *skb_prev;
1207 alloc_new_skb:
1208 skb_prev = skb;
1209
1210 /* There's no room in the current skb */
1211 if (skb_prev)
1212 fraggap = skb_prev->len - maxfraglen;
1213 else
1214 fraggap = 0;
1215
1216 /*
1217 * If remaining data exceeds the mtu,
1218 * we know we need more fragment(s).
1219 */
1220 datalen = length + fraggap;
1221 if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen)
1222 datalen = maxfraglen - fragheaderlen;
1223
1224 fraglen = datalen + fragheaderlen;
1225 if ((flags & MSG_MORE) &&
1226 !(rt->u.dst.dev->features&NETIF_F_SG))
1227 alloclen = mtu;
1228 else
1229 alloclen = datalen + fragheaderlen;
1230
1231 /*
1232 * The last fragment gets additional space at tail.
1233 * Note: we overallocate on fragments with MSG_MODE
1234 * because we have no idea if we're the last one.
1235 */
1236 if (datalen == length + fraggap)
1237 alloclen += rt->u.dst.trailer_len;
1238
1239 /*
1240 * We just reserve space for fragment header.
1241 * Note: this may be overallocation if the message
1242 * (without MSG_MORE) fits into the MTU.
1243 */
1244 alloclen += sizeof(struct frag_hdr);
1245
1246 if (transhdrlen) {
1247 skb = sock_alloc_send_skb(sk,
1248 alloclen + hh_len,
1249 (flags & MSG_DONTWAIT), &err);
1250 } else {
1251 skb = NULL;
1252 if (atomic_read(&sk->sk_wmem_alloc) <=
1253 2 * sk->sk_sndbuf)
1254 skb = sock_wmalloc(sk,
1255 alloclen + hh_len, 1,
1256 sk->sk_allocation);
1257 if (unlikely(skb == NULL))
1258 err = -ENOBUFS;
1259 }
1260 if (skb == NULL)
1261 goto error;
1262 /*
1263 * Fill in the control structures
1264 */
1265 skb->ip_summed = csummode;
1266 skb->csum = 0;
1267 /* reserve for fragmentation */
1268 skb_reserve(skb, hh_len+sizeof(struct frag_hdr));
1269
1270 /*
1271 * Find where to start putting bytes
1272 */
1273 data = skb_put(skb, fraglen);
1274 skb_set_network_header(skb, exthdrlen);
1275 data += fragheaderlen;
1276 skb->transport_header = (skb->network_header +
1277 fragheaderlen);
1278 if (fraggap) {
1279 skb->csum = skb_copy_and_csum_bits(
1280 skb_prev, maxfraglen,
1281 data + transhdrlen, fraggap, 0);
1282 skb_prev->csum = csum_sub(skb_prev->csum,
1283 skb->csum);
1284 data += fraggap;
1285 pskb_trim_unique(skb_prev, maxfraglen);
1286 }
1287 copy = datalen - transhdrlen - fraggap;
1288 if (copy < 0) {
1289 err = -EINVAL;
1290 kfree_skb(skb);
1291 goto error;
1292 } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) {
1293 err = -EFAULT;
1294 kfree_skb(skb);
1295 goto error;
1296 }
1297
1298 offset += copy;
1299 length -= datalen - fraggap;
1300 transhdrlen = 0;
1301 exthdrlen = 0;
1302 csummode = CHECKSUM_NONE;
1303
1304 /*
1305 * Put the packet on the pending queue
1306 */
1307 __skb_queue_tail(&sk->sk_write_queue, skb);
1308 continue;
1309 }
1310
1311 if (copy > length)
1312 copy = length;
1313
1314 if (!(rt->u.dst.dev->features&NETIF_F_SG)) {
1315 unsigned int off;
1316
1317 off = skb->len;
1318 if (getfrag(from, skb_put(skb, copy),
1319 offset, copy, off, skb) < 0) {
1320 __skb_trim(skb, off);
1321 err = -EFAULT;
1322 goto error;
1323 }
1324 } else {
1325 int i = skb_shinfo(skb)->nr_frags;
1326 skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1];
1327 struct page *page = sk->sk_sndmsg_page;
1328 int off = sk->sk_sndmsg_off;
1329 unsigned int left;
1330
1331 if (page && (left = PAGE_SIZE - off) > 0) {
1332 if (copy >= left)
1333 copy = left;
1334 if (page != frag->page) {
1335 if (i == MAX_SKB_FRAGS) {
1336 err = -EMSGSIZE;
1337 goto error;
1338 }
1339 get_page(page);
1340 skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0);
1341 frag = &skb_shinfo(skb)->frags[i];
1342 }
1343 } else if(i < MAX_SKB_FRAGS) {
1344 if (copy > PAGE_SIZE)
1345 copy = PAGE_SIZE;
1346 page = alloc_pages(sk->sk_allocation, 0);
1347 if (page == NULL) {
1348 err = -ENOMEM;
1349 goto error;
1350 }
1351 sk->sk_sndmsg_page = page;
1352 sk->sk_sndmsg_off = 0;
1353
1354 skb_fill_page_desc(skb, i, page, 0, 0);
1355 frag = &skb_shinfo(skb)->frags[i];
1356 } else {
1357 err = -EMSGSIZE;
1358 goto error;
1359 }
1360 if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) {
1361 err = -EFAULT;
1362 goto error;
1363 }
1364 sk->sk_sndmsg_off += copy;
1365 frag->size += copy;
1366 skb->len += copy;
1367 skb->data_len += copy;
1368 skb->truesize += copy;
1369 atomic_add(copy, &sk->sk_wmem_alloc);
1370 }
1371 offset += copy;
1372 length -= copy;
1373 }
1374 return 0;
1375 error:
1376 inet->cork.length -= length;
1377 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
1378 return err;
1379 }
1380
1381 static void ip6_cork_release(struct inet_sock *inet, struct ipv6_pinfo *np)
1382 {
1383 inet->cork.flags &= ~IPCORK_OPT;
1384 kfree(np->cork.opt);
1385 np->cork.opt = NULL;
1386 if (inet->cork.dst) {
1387 dst_release(inet->cork.dst);
1388 inet->cork.dst = NULL;
1389 inet->cork.flags &= ~IPCORK_ALLFRAG;
1390 }
1391 memset(&inet->cork.fl, 0, sizeof(inet->cork.fl));
1392 }
1393
1394 int ip6_push_pending_frames(struct sock *sk)
1395 {
1396 struct sk_buff *skb, *tmp_skb;
1397 struct sk_buff **tail_skb;
1398 struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
1399 struct inet_sock *inet = inet_sk(sk);
1400 struct ipv6_pinfo *np = inet6_sk(sk);
1401 struct ipv6hdr *hdr;
1402 struct ipv6_txoptions *opt = np->cork.opt;
1403 struct rt6_info *rt = (struct rt6_info *)inet->cork.dst;
1404 struct flowi *fl = &inet->cork.fl;
1405 unsigned char proto = fl->proto;
1406 int err = 0;
1407
1408 if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL)
1409 goto out;
1410 tail_skb = &(skb_shinfo(skb)->frag_list);
1411
1412 /* move skb->data to ip header from ext header */
1413 if (skb->data < skb_network_header(skb))
1414 __skb_pull(skb, skb_network_offset(skb));
1415 while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) {
1416 __skb_pull(tmp_skb, skb_network_header_len(skb));
1417 *tail_skb = tmp_skb;
1418 tail_skb = &(tmp_skb->next);
1419 skb->len += tmp_skb->len;
1420 skb->data_len += tmp_skb->len;
1421 skb->truesize += tmp_skb->truesize;
1422 __sock_put(tmp_skb->sk);
1423 tmp_skb->destructor = NULL;
1424 tmp_skb->sk = NULL;
1425 }
1426
1427 /* Allow local fragmentation. */
1428 if (np->pmtudisc < IPV6_PMTUDISC_DO)
1429 skb->local_df = 1;
1430
1431 ipv6_addr_copy(final_dst, &fl->fl6_dst);
1432 __skb_pull(skb, skb_network_header_len(skb));
1433 if (opt && opt->opt_flen)
1434 ipv6_push_frag_opts(skb, opt, &proto);
1435 if (opt && opt->opt_nflen)
1436 ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
1437
1438 skb_push(skb, sizeof(struct ipv6hdr));
1439 skb_reset_network_header(skb);
1440 hdr = ipv6_hdr(skb);
1441
1442 *(__be32*)hdr = fl->fl6_flowlabel |
1443 htonl(0x60000000 | ((int)np->cork.tclass << 20));
1444
1445 hdr->hop_limit = np->cork.hop_limit;
1446 hdr->nexthdr = proto;
1447 ipv6_addr_copy(&hdr->saddr, &fl->fl6_src);
1448 ipv6_addr_copy(&hdr->daddr, final_dst);
1449
1450 skb->priority = sk->sk_priority;
1451 skb->mark = sk->sk_mark;
1452
1453 skb->dst = dst_clone(&rt->u.dst);
1454 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS);
1455 if (proto == IPPROTO_ICMPV6) {
1456 struct inet6_dev *idev = ip6_dst_idev(skb->dst);
1457
1458 ICMP6MSGOUT_INC_STATS_BH(idev, icmp6_hdr(skb)->icmp6_type);
1459 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_OUTMSGS);
1460 }
1461
1462 err = ip6_local_out(skb);
1463 if (err) {
1464 if (err > 0)
1465 err = np->recverr ? net_xmit_errno(err) : 0;
1466 if (err)
1467 goto error;
1468 }
1469
1470 out:
1471 ip6_cork_release(inet, np);
1472 return err;
1473 error:
1474 goto out;
1475 }
1476
1477 void ip6_flush_pending_frames(struct sock *sk)
1478 {
1479 struct sk_buff *skb;
1480
1481 while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) {
1482 if (skb->dst)
1483 IP6_INC_STATS(ip6_dst_idev(skb->dst),
1484 IPSTATS_MIB_OUTDISCARDS);
1485 kfree_skb(skb);
1486 }
1487
1488 ip6_cork_release(inet_sk(sk), inet6_sk(sk));
1489 }
Support for the Chinese Samsung S3C2440 based development boards