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Commit | Line | Data |
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1da177e4 LT |
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/config.h> | |
32 | #include <linux/errno.h> | |
33 | #include <linux/types.h> | |
34 | #include <linux/string.h> | |
35 | #include <linux/socket.h> | |
36 | #include <linux/net.h> | |
37 | #include <linux/netdevice.h> | |
38 | #include <linux/if_arp.h> | |
39 | #include <linux/in6.h> | |
40 | #include <linux/tcp.h> | |
41 | #include <linux/route.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 | ||
59 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)); | |
60 | ||
61 | static __inline__ void ipv6_select_ident(struct sk_buff *skb, struct frag_hdr *fhdr) | |
62 | { | |
63 | static u32 ipv6_fragmentation_id = 1; | |
64 | static DEFINE_SPINLOCK(ip6_id_lock); | |
65 | ||
66 | spin_lock_bh(&ip6_id_lock); | |
67 | fhdr->identification = htonl(ipv6_fragmentation_id); | |
68 | if (++ipv6_fragmentation_id == 0) | |
69 | ipv6_fragmentation_id = 1; | |
70 | spin_unlock_bh(&ip6_id_lock); | |
71 | } | |
72 | ||
73 | static inline int ip6_output_finish(struct sk_buff *skb) | |
74 | { | |
75 | ||
76 | struct dst_entry *dst = skb->dst; | |
77 | struct hh_cache *hh = dst->hh; | |
78 | ||
79 | if (hh) { | |
80 | int hh_alen; | |
81 | ||
82 | read_lock_bh(&hh->hh_lock); | |
83 | hh_alen = HH_DATA_ALIGN(hh->hh_len); | |
84 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
85 | read_unlock_bh(&hh->hh_lock); | |
86 | skb_push(skb, hh->hh_len); | |
87 | return hh->hh_output(skb); | |
88 | } else if (dst->neighbour) | |
89 | return dst->neighbour->output(skb); | |
90 | ||
91 | IP6_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
92 | kfree_skb(skb); | |
93 | return -EINVAL; | |
94 | ||
95 | } | |
96 | ||
97 | /* dev_loopback_xmit for use with netfilter. */ | |
98 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) | |
99 | { | |
100 | newskb->mac.raw = newskb->data; | |
101 | __skb_pull(newskb, newskb->nh.raw - newskb->data); | |
102 | newskb->pkt_type = PACKET_LOOPBACK; | |
103 | newskb->ip_summed = CHECKSUM_UNNECESSARY; | |
104 | BUG_TRAP(newskb->dst); | |
105 | ||
106 | netif_rx(newskb); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | ||
111 | static int ip6_output2(struct sk_buff *skb) | |
112 | { | |
113 | struct dst_entry *dst = skb->dst; | |
114 | struct net_device *dev = dst->dev; | |
115 | ||
116 | skb->protocol = htons(ETH_P_IPV6); | |
117 | skb->dev = dev; | |
118 | ||
119 | if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr)) { | |
120 | struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL; | |
121 | ||
122 | if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && | |
123 | ipv6_chk_mcast_addr(dev, &skb->nh.ipv6h->daddr, | |
124 | &skb->nh.ipv6h->saddr)) { | |
125 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); | |
126 | ||
127 | /* Do not check for IFF_ALLMULTI; multicast routing | |
128 | is not supported in any case. | |
129 | */ | |
130 | if (newskb) | |
131 | NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, newskb, NULL, | |
132 | newskb->dev, | |
133 | ip6_dev_loopback_xmit); | |
134 | ||
135 | if (skb->nh.ipv6h->hop_limit == 0) { | |
136 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
137 | kfree_skb(skb); | |
138 | return 0; | |
139 | } | |
140 | } | |
141 | ||
142 | IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); | |
143 | } | |
144 | ||
145 | return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb,NULL, skb->dev,ip6_output_finish); | |
146 | } | |
147 | ||
148 | int ip6_output(struct sk_buff *skb) | |
149 | { | |
e89e9cf5 AR |
150 | if ((skb->len > dst_mtu(skb->dst) && !skb_shinfo(skb)->ufo_size) || |
151 | dst_allfrag(skb->dst)) | |
1da177e4 LT |
152 | return ip6_fragment(skb, ip6_output2); |
153 | else | |
154 | return ip6_output2(skb); | |
155 | } | |
156 | ||
1da177e4 LT |
157 | /* |
158 | * xmit an sk_buff (used by TCP) | |
159 | */ | |
160 | ||
161 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, | |
162 | struct ipv6_txoptions *opt, int ipfragok) | |
163 | { | |
164 | struct ipv6_pinfo *np = sk ? inet6_sk(sk) : NULL; | |
165 | struct in6_addr *first_hop = &fl->fl6_dst; | |
166 | struct dst_entry *dst = skb->dst; | |
167 | struct ipv6hdr *hdr; | |
168 | u8 proto = fl->proto; | |
169 | int seg_len = skb->len; | |
41a1f8ea | 170 | int hlimit, tclass; |
1da177e4 LT |
171 | u32 mtu; |
172 | ||
173 | if (opt) { | |
174 | int head_room; | |
175 | ||
176 | /* First: exthdrs may take lots of space (~8K for now) | |
177 | MAX_HEADER is not enough. | |
178 | */ | |
179 | head_room = opt->opt_nflen + opt->opt_flen; | |
180 | seg_len += head_room; | |
181 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
182 | ||
183 | if (skb_headroom(skb) < head_room) { | |
184 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
185 | kfree_skb(skb); | |
186 | skb = skb2; | |
187 | if (skb == NULL) { | |
188 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
189 | return -ENOBUFS; | |
190 | } | |
191 | if (sk) | |
192 | skb_set_owner_w(skb, sk); | |
193 | } | |
194 | if (opt->opt_flen) | |
195 | ipv6_push_frag_opts(skb, opt, &proto); | |
196 | if (opt->opt_nflen) | |
197 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
198 | } | |
199 | ||
200 | hdr = skb->nh.ipv6h = (struct ipv6hdr*)skb_push(skb, sizeof(struct ipv6hdr)); | |
201 | ||
202 | /* | |
203 | * Fill in the IPv6 header | |
204 | */ | |
205 | ||
1da177e4 LT |
206 | hlimit = -1; |
207 | if (np) | |
208 | hlimit = np->hop_limit; | |
209 | if (hlimit < 0) | |
210 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); | |
211 | if (hlimit < 0) | |
212 | hlimit = ipv6_get_hoplimit(dst->dev); | |
213 | ||
41a1f8ea YH |
214 | tclass = -1; |
215 | if (np) | |
216 | tclass = np->tclass; | |
217 | if (tclass < 0) | |
218 | tclass = 0; | |
219 | ||
220 | *(u32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel; | |
221 | ||
1da177e4 LT |
222 | hdr->payload_len = htons(seg_len); |
223 | hdr->nexthdr = proto; | |
224 | hdr->hop_limit = hlimit; | |
225 | ||
226 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
227 | ipv6_addr_copy(&hdr->daddr, first_hop); | |
228 | ||
229 | mtu = dst_mtu(dst); | |
230 | if ((skb->len <= mtu) || ipfragok) { | |
231 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
6869c4d8 HW |
232 | return NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, |
233 | dst_output); | |
1da177e4 LT |
234 | } |
235 | ||
236 | if (net_ratelimit()) | |
237 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | |
238 | skb->dev = dst->dev; | |
239 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); | |
240 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
241 | kfree_skb(skb); | |
242 | return -EMSGSIZE; | |
243 | } | |
244 | ||
245 | /* | |
246 | * To avoid extra problems ND packets are send through this | |
247 | * routine. It's code duplication but I really want to avoid | |
248 | * extra checks since ipv6_build_header is used by TCP (which | |
249 | * is for us performance critical) | |
250 | */ | |
251 | ||
252 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
253 | struct in6_addr *saddr, struct in6_addr *daddr, | |
254 | int proto, int len) | |
255 | { | |
256 | struct ipv6_pinfo *np = inet6_sk(sk); | |
257 | struct ipv6hdr *hdr; | |
258 | int totlen; | |
259 | ||
260 | skb->protocol = htons(ETH_P_IPV6); | |
261 | skb->dev = dev; | |
262 | ||
263 | totlen = len + sizeof(struct ipv6hdr); | |
264 | ||
265 | hdr = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr)); | |
266 | skb->nh.ipv6h = hdr; | |
267 | ||
268 | *(u32*)hdr = htonl(0x60000000); | |
269 | ||
270 | hdr->payload_len = htons(len); | |
271 | hdr->nexthdr = proto; | |
272 | hdr->hop_limit = np->hop_limit; | |
273 | ||
274 | ipv6_addr_copy(&hdr->saddr, saddr); | |
275 | ipv6_addr_copy(&hdr->daddr, daddr); | |
276 | ||
277 | return 0; | |
278 | } | |
279 | ||
280 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
281 | { | |
282 | struct ip6_ra_chain *ra; | |
283 | struct sock *last = NULL; | |
284 | ||
285 | read_lock(&ip6_ra_lock); | |
286 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
287 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
288 | if (sk && ra->sel == sel && |
289 | (!sk->sk_bound_dev_if || | |
290 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
291 | if (last) { |
292 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
293 | if (skb2) | |
294 | rawv6_rcv(last, skb2); | |
295 | } | |
296 | last = sk; | |
297 | } | |
298 | } | |
299 | ||
300 | if (last) { | |
301 | rawv6_rcv(last, skb); | |
302 | read_unlock(&ip6_ra_lock); | |
303 | return 1; | |
304 | } | |
305 | read_unlock(&ip6_ra_lock); | |
306 | return 0; | |
307 | } | |
308 | ||
309 | static inline int ip6_forward_finish(struct sk_buff *skb) | |
310 | { | |
311 | return dst_output(skb); | |
312 | } | |
313 | ||
314 | int ip6_forward(struct sk_buff *skb) | |
315 | { | |
316 | struct dst_entry *dst = skb->dst; | |
317 | struct ipv6hdr *hdr = skb->nh.ipv6h; | |
318 | struct inet6_skb_parm *opt = IP6CB(skb); | |
319 | ||
320 | if (ipv6_devconf.forwarding == 0) | |
321 | goto error; | |
322 | ||
323 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { | |
324 | IP6_INC_STATS(IPSTATS_MIB_INDISCARDS); | |
325 | goto drop; | |
326 | } | |
327 | ||
328 | skb->ip_summed = CHECKSUM_NONE; | |
329 | ||
330 | /* | |
331 | * We DO NOT make any processing on | |
332 | * RA packets, pushing them to user level AS IS | |
333 | * without ane WARRANTY that application will be able | |
334 | * to interpret them. The reason is that we | |
335 | * cannot make anything clever here. | |
336 | * | |
337 | * We are not end-node, so that if packet contains | |
338 | * AH/ESP, we cannot make anything. | |
339 | * Defragmentation also would be mistake, RA packets | |
340 | * cannot be fragmented, because there is no warranty | |
341 | * that different fragments will go along one path. --ANK | |
342 | */ | |
343 | if (opt->ra) { | |
344 | u8 *ptr = skb->nh.raw + opt->ra; | |
345 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) | |
346 | return 0; | |
347 | } | |
348 | ||
349 | /* | |
350 | * check and decrement ttl | |
351 | */ | |
352 | if (hdr->hop_limit <= 1) { | |
353 | /* Force OUTPUT device used as source address */ | |
354 | skb->dev = dst->dev; | |
355 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
356 | 0, skb->dev); | |
357 | ||
358 | kfree_skb(skb); | |
359 | return -ETIMEDOUT; | |
360 | } | |
361 | ||
362 | if (!xfrm6_route_forward(skb)) { | |
363 | IP6_INC_STATS(IPSTATS_MIB_INDISCARDS); | |
364 | goto drop; | |
365 | } | |
366 | dst = skb->dst; | |
367 | ||
368 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
369 | send redirects to source routed frames. | |
370 | */ | |
371 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0) { | |
372 | struct in6_addr *target = NULL; | |
373 | struct rt6_info *rt; | |
374 | struct neighbour *n = dst->neighbour; | |
375 | ||
376 | /* | |
377 | * incoming and outgoing devices are the same | |
378 | * send a redirect. | |
379 | */ | |
380 | ||
381 | rt = (struct rt6_info *) dst; | |
382 | if ((rt->rt6i_flags & RTF_GATEWAY)) | |
383 | target = (struct in6_addr*)&n->primary_key; | |
384 | else | |
385 | target = &hdr->daddr; | |
386 | ||
387 | /* Limit redirects both by destination (here) | |
388 | and by source (inside ndisc_send_redirect) | |
389 | */ | |
390 | if (xrlim_allow(dst, 1*HZ)) | |
391 | ndisc_send_redirect(skb, n, target); | |
392 | } else if (ipv6_addr_type(&hdr->saddr)&(IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK | |
393 | |IPV6_ADDR_LINKLOCAL)) { | |
394 | /* This check is security critical. */ | |
395 | goto error; | |
396 | } | |
397 | ||
398 | if (skb->len > dst_mtu(dst)) { | |
399 | /* Again, force OUTPUT device used as source address */ | |
400 | skb->dev = dst->dev; | |
401 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); | |
402 | IP6_INC_STATS_BH(IPSTATS_MIB_INTOOBIGERRORS); | |
403 | IP6_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | |
404 | kfree_skb(skb); | |
405 | return -EMSGSIZE; | |
406 | } | |
407 | ||
408 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
409 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
410 | goto drop; | |
411 | } | |
412 | ||
413 | hdr = skb->nh.ipv6h; | |
414 | ||
415 | /* Mangling hops number delayed to point after skb COW */ | |
416 | ||
417 | hdr->hop_limit--; | |
418 | ||
419 | IP6_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | |
420 | return NF_HOOK(PF_INET6,NF_IP6_FORWARD, skb, skb->dev, dst->dev, ip6_forward_finish); | |
421 | ||
422 | error: | |
423 | IP6_INC_STATS_BH(IPSTATS_MIB_INADDRERRORS); | |
424 | drop: | |
425 | kfree_skb(skb); | |
426 | return -EINVAL; | |
427 | } | |
428 | ||
429 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
430 | { | |
431 | to->pkt_type = from->pkt_type; | |
432 | to->priority = from->priority; | |
433 | to->protocol = from->protocol; | |
1da177e4 LT |
434 | dst_release(to->dst); |
435 | to->dst = dst_clone(from->dst); | |
436 | to->dev = from->dev; | |
437 | ||
438 | #ifdef CONFIG_NET_SCHED | |
439 | to->tc_index = from->tc_index; | |
440 | #endif | |
441 | #ifdef CONFIG_NETFILTER | |
442 | to->nfmark = from->nfmark; | |
443 | /* Connection association is same as pre-frag packet */ | |
9fb9cbb1 | 444 | nf_conntrack_put(to->nfct); |
1da177e4 LT |
445 | to->nfct = from->nfct; |
446 | nf_conntrack_get(to->nfct); | |
447 | to->nfctinfo = from->nfctinfo; | |
9fb9cbb1 YK |
448 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
449 | nf_conntrack_put_reasm(to->nfct_reasm); | |
450 | to->nfct_reasm = from->nfct_reasm; | |
451 | nf_conntrack_get_reasm(to->nfct_reasm); | |
452 | #endif | |
1da177e4 LT |
453 | #ifdef CONFIG_BRIDGE_NETFILTER |
454 | nf_bridge_put(to->nf_bridge); | |
455 | to->nf_bridge = from->nf_bridge; | |
456 | nf_bridge_get(to->nf_bridge); | |
457 | #endif | |
1da177e4 LT |
458 | #endif |
459 | } | |
460 | ||
461 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
462 | { | |
463 | u16 offset = sizeof(struct ipv6hdr); | |
464 | struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1); | |
465 | unsigned int packet_len = skb->tail - skb->nh.raw; | |
466 | int found_rhdr = 0; | |
467 | *nexthdr = &skb->nh.ipv6h->nexthdr; | |
468 | ||
469 | while (offset + 1 <= packet_len) { | |
470 | ||
471 | switch (**nexthdr) { | |
472 | ||
473 | case NEXTHDR_HOP: | |
474 | case NEXTHDR_ROUTING: | |
475 | case NEXTHDR_DEST: | |
476 | if (**nexthdr == NEXTHDR_ROUTING) found_rhdr = 1; | |
477 | if (**nexthdr == NEXTHDR_DEST && found_rhdr) return offset; | |
478 | offset += ipv6_optlen(exthdr); | |
479 | *nexthdr = &exthdr->nexthdr; | |
480 | exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); | |
481 | break; | |
482 | default : | |
483 | return offset; | |
484 | } | |
485 | } | |
486 | ||
487 | return offset; | |
488 | } | |
489 | ||
490 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) | |
491 | { | |
492 | struct net_device *dev; | |
493 | struct sk_buff *frag; | |
494 | struct rt6_info *rt = (struct rt6_info*)skb->dst; | |
495 | struct ipv6hdr *tmp_hdr; | |
496 | struct frag_hdr *fh; | |
497 | unsigned int mtu, hlen, left, len; | |
498 | u32 frag_id = 0; | |
499 | int ptr, offset = 0, err=0; | |
500 | u8 *prevhdr, nexthdr = 0; | |
501 | ||
502 | dev = rt->u.dst.dev; | |
503 | hlen = ip6_find_1stfragopt(skb, &prevhdr); | |
504 | nexthdr = *prevhdr; | |
505 | ||
506 | mtu = dst_mtu(&rt->u.dst) - hlen - sizeof(struct frag_hdr); | |
507 | ||
508 | if (skb_shinfo(skb)->frag_list) { | |
509 | int first_len = skb_pagelen(skb); | |
510 | ||
511 | if (first_len - hlen > mtu || | |
512 | ((first_len - hlen) & 7) || | |
513 | skb_cloned(skb)) | |
514 | goto slow_path; | |
515 | ||
516 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { | |
517 | /* Correct geometry. */ | |
518 | if (frag->len > mtu || | |
519 | ((frag->len & 7) && frag->next) || | |
520 | skb_headroom(frag) < hlen) | |
521 | goto slow_path; | |
522 | ||
1da177e4 LT |
523 | /* Partially cloned skb? */ |
524 | if (skb_shared(frag)) | |
525 | goto slow_path; | |
2fdba6b0 HX |
526 | |
527 | BUG_ON(frag->sk); | |
528 | if (skb->sk) { | |
529 | sock_hold(skb->sk); | |
530 | frag->sk = skb->sk; | |
531 | frag->destructor = sock_wfree; | |
532 | skb->truesize -= frag->truesize; | |
533 | } | |
1da177e4 LT |
534 | } |
535 | ||
536 | err = 0; | |
537 | offset = 0; | |
538 | frag = skb_shinfo(skb)->frag_list; | |
539 | skb_shinfo(skb)->frag_list = NULL; | |
540 | /* BUILD HEADER */ | |
541 | ||
542 | tmp_hdr = kmalloc(hlen, GFP_ATOMIC); | |
543 | if (!tmp_hdr) { | |
544 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
545 | return -ENOMEM; | |
546 | } | |
547 | ||
548 | *prevhdr = NEXTHDR_FRAGMENT; | |
549 | memcpy(tmp_hdr, skb->nh.raw, hlen); | |
550 | __skb_pull(skb, hlen); | |
551 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
552 | skb->nh.raw = __skb_push(skb, hlen); | |
553 | memcpy(skb->nh.raw, tmp_hdr, hlen); | |
554 | ||
555 | ipv6_select_ident(skb, fh); | |
556 | fh->nexthdr = nexthdr; | |
557 | fh->reserved = 0; | |
558 | fh->frag_off = htons(IP6_MF); | |
559 | frag_id = fh->identification; | |
560 | ||
561 | first_len = skb_pagelen(skb); | |
562 | skb->data_len = first_len - skb_headlen(skb); | |
563 | skb->len = first_len; | |
564 | skb->nh.ipv6h->payload_len = htons(first_len - sizeof(struct ipv6hdr)); | |
565 | ||
566 | ||
567 | for (;;) { | |
568 | /* Prepare header of the next frame, | |
569 | * before previous one went down. */ | |
570 | if (frag) { | |
571 | frag->ip_summed = CHECKSUM_NONE; | |
572 | frag->h.raw = frag->data; | |
573 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); | |
574 | frag->nh.raw = __skb_push(frag, hlen); | |
575 | memcpy(frag->nh.raw, tmp_hdr, hlen); | |
576 | offset += skb->len - hlen - sizeof(struct frag_hdr); | |
577 | fh->nexthdr = nexthdr; | |
578 | fh->reserved = 0; | |
579 | fh->frag_off = htons(offset); | |
580 | if (frag->next != NULL) | |
581 | fh->frag_off |= htons(IP6_MF); | |
582 | fh->identification = frag_id; | |
583 | frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
584 | ip6_copy_metadata(frag, skb); | |
585 | } | |
586 | ||
587 | err = output(skb); | |
588 | if (err || !frag) | |
589 | break; | |
590 | ||
591 | skb = frag; | |
592 | frag = skb->next; | |
593 | skb->next = NULL; | |
594 | } | |
595 | ||
a51482bd | 596 | kfree(tmp_hdr); |
1da177e4 LT |
597 | |
598 | if (err == 0) { | |
599 | IP6_INC_STATS(IPSTATS_MIB_FRAGOKS); | |
600 | return 0; | |
601 | } | |
602 | ||
603 | while (frag) { | |
604 | skb = frag->next; | |
605 | kfree_skb(frag); | |
606 | frag = skb; | |
607 | } | |
608 | ||
609 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
610 | return err; | |
611 | } | |
612 | ||
613 | slow_path: | |
614 | left = skb->len - hlen; /* Space per frame */ | |
615 | ptr = hlen; /* Where to start from */ | |
616 | ||
617 | /* | |
618 | * Fragment the datagram. | |
619 | */ | |
620 | ||
621 | *prevhdr = NEXTHDR_FRAGMENT; | |
622 | ||
623 | /* | |
624 | * Keep copying data until we run out. | |
625 | */ | |
626 | while(left > 0) { | |
627 | len = left; | |
628 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
629 | if (len > mtu) | |
630 | len = mtu; | |
631 | /* IF: we are not sending upto and including the packet end | |
632 | then align the next start on an eight byte boundary */ | |
633 | if (len < left) { | |
634 | len &= ~7; | |
635 | } | |
636 | /* | |
637 | * Allocate buffer. | |
638 | */ | |
639 | ||
640 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_RESERVED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) { | |
64ce2073 | 641 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
1da177e4 LT |
642 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); |
643 | err = -ENOMEM; | |
644 | goto fail; | |
645 | } | |
646 | ||
647 | /* | |
648 | * Set up data on packet | |
649 | */ | |
650 | ||
651 | ip6_copy_metadata(frag, skb); | |
652 | skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); | |
653 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); | |
654 | frag->nh.raw = frag->data; | |
655 | fh = (struct frag_hdr*)(frag->data + hlen); | |
656 | frag->h.raw = frag->data + hlen + sizeof(struct frag_hdr); | |
657 | ||
658 | /* | |
659 | * Charge the memory for the fragment to any owner | |
660 | * it might possess | |
661 | */ | |
662 | if (skb->sk) | |
663 | skb_set_owner_w(frag, skb->sk); | |
664 | ||
665 | /* | |
666 | * Copy the packet header into the new buffer. | |
667 | */ | |
668 | memcpy(frag->nh.raw, skb->data, hlen); | |
669 | ||
670 | /* | |
671 | * Build fragment header. | |
672 | */ | |
673 | fh->nexthdr = nexthdr; | |
674 | fh->reserved = 0; | |
f36d6ab1 | 675 | if (!frag_id) { |
1da177e4 LT |
676 | ipv6_select_ident(skb, fh); |
677 | frag_id = fh->identification; | |
678 | } else | |
679 | fh->identification = frag_id; | |
680 | ||
681 | /* | |
682 | * Copy a block of the IP datagram. | |
683 | */ | |
684 | if (skb_copy_bits(skb, ptr, frag->h.raw, len)) | |
685 | BUG(); | |
686 | left -= len; | |
687 | ||
688 | fh->frag_off = htons(offset); | |
689 | if (left > 0) | |
690 | fh->frag_off |= htons(IP6_MF); | |
691 | frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
692 | ||
693 | ptr += len; | |
694 | offset += len; | |
695 | ||
696 | /* | |
697 | * Put this fragment into the sending queue. | |
698 | */ | |
699 | ||
700 | IP6_INC_STATS(IPSTATS_MIB_FRAGCREATES); | |
701 | ||
702 | err = output(frag); | |
703 | if (err) | |
704 | goto fail; | |
705 | } | |
706 | kfree_skb(skb); | |
707 | IP6_INC_STATS(IPSTATS_MIB_FRAGOKS); | |
708 | return err; | |
709 | ||
710 | fail: | |
711 | kfree_skb(skb); | |
712 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
713 | return err; | |
714 | } | |
715 | ||
716 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) | |
717 | { | |
718 | int err = 0; | |
719 | ||
720 | *dst = NULL; | |
721 | if (sk) { | |
722 | struct ipv6_pinfo *np = inet6_sk(sk); | |
723 | ||
724 | *dst = sk_dst_check(sk, np->dst_cookie); | |
725 | if (*dst) { | |
726 | struct rt6_info *rt = (struct rt6_info*)*dst; | |
727 | ||
728 | /* Yes, checking route validity in not connected | |
729 | case is not very simple. Take into account, | |
730 | that we do not support routing by source, TOS, | |
731 | and MSG_DONTROUTE --ANK (980726) | |
732 | ||
733 | 1. If route was host route, check that | |
734 | cached destination is current. | |
735 | If it is network route, we still may | |
736 | check its validity using saved pointer | |
737 | to the last used address: daddr_cache. | |
738 | We do not want to save whole address now, | |
739 | (because main consumer of this service | |
740 | is tcp, which has not this problem), | |
741 | so that the last trick works only on connected | |
742 | sockets. | |
743 | 2. oif also should be the same. | |
744 | */ | |
745 | ||
746 | if (((rt->rt6i_dst.plen != 128 || | |
747 | !ipv6_addr_equal(&fl->fl6_dst, &rt->rt6i_dst.addr)) | |
748 | && (np->daddr_cache == NULL || | |
749 | !ipv6_addr_equal(&fl->fl6_dst, np->daddr_cache))) | |
750 | || (fl->oif && fl->oif != (*dst)->dev->ifindex)) { | |
751 | dst_release(*dst); | |
752 | *dst = NULL; | |
753 | } | |
754 | } | |
755 | } | |
756 | ||
757 | if (*dst == NULL) | |
758 | *dst = ip6_route_output(sk, fl); | |
759 | ||
760 | if ((err = (*dst)->error)) | |
761 | goto out_err_release; | |
762 | ||
763 | if (ipv6_addr_any(&fl->fl6_src)) { | |
764 | err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src); | |
765 | ||
44456d37 | 766 | if (err) |
1da177e4 | 767 | goto out_err_release; |
1da177e4 LT |
768 | } |
769 | ||
770 | return 0; | |
771 | ||
772 | out_err_release: | |
773 | dst_release(*dst); | |
774 | *dst = NULL; | |
775 | return err; | |
776 | } | |
34a0b3cd AB |
777 | |
778 | static inline int ip6_ufo_append_data(struct sock *sk, | |
e89e9cf5 AR |
779 | int getfrag(void *from, char *to, int offset, int len, |
780 | int odd, struct sk_buff *skb), | |
781 | void *from, int length, int hh_len, int fragheaderlen, | |
782 | int transhdrlen, int mtu,unsigned int flags) | |
783 | ||
784 | { | |
785 | struct sk_buff *skb; | |
786 | int err; | |
787 | ||
788 | /* There is support for UDP large send offload by network | |
789 | * device, so create one single skb packet containing complete | |
790 | * udp datagram | |
791 | */ | |
792 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
793 | skb = sock_alloc_send_skb(sk, | |
794 | hh_len + fragheaderlen + transhdrlen + 20, | |
795 | (flags & MSG_DONTWAIT), &err); | |
796 | if (skb == NULL) | |
797 | return -ENOMEM; | |
798 | ||
799 | /* reserve space for Hardware header */ | |
800 | skb_reserve(skb, hh_len); | |
801 | ||
802 | /* create space for UDP/IP header */ | |
803 | skb_put(skb,fragheaderlen + transhdrlen); | |
804 | ||
805 | /* initialize network header pointer */ | |
806 | skb->nh.raw = skb->data; | |
807 | ||
808 | /* initialize protocol header pointer */ | |
809 | skb->h.raw = skb->data + fragheaderlen; | |
810 | ||
811 | skb->ip_summed = CHECKSUM_HW; | |
812 | skb->csum = 0; | |
813 | sk->sk_sndmsg_off = 0; | |
814 | } | |
815 | ||
816 | err = skb_append_datato_frags(sk,skb, getfrag, from, | |
817 | (length - transhdrlen)); | |
818 | if (!err) { | |
819 | struct frag_hdr fhdr; | |
820 | ||
821 | /* specify the length of each IP datagram fragment*/ | |
822 | skb_shinfo(skb)->ufo_size = (mtu - fragheaderlen) - | |
823 | sizeof(struct frag_hdr); | |
824 | ipv6_select_ident(skb, &fhdr); | |
825 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; | |
826 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
827 | ||
828 | return 0; | |
829 | } | |
830 | /* There is not enough support do UPD LSO, | |
831 | * so follow normal path | |
832 | */ | |
833 | kfree_skb(skb); | |
834 | ||
835 | return err; | |
836 | } | |
1da177e4 | 837 | |
41a1f8ea YH |
838 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
839 | int offset, int len, int odd, struct sk_buff *skb), | |
840 | void *from, int length, int transhdrlen, | |
841 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl, | |
842 | struct rt6_info *rt, unsigned int flags) | |
1da177e4 LT |
843 | { |
844 | struct inet_sock *inet = inet_sk(sk); | |
845 | struct ipv6_pinfo *np = inet6_sk(sk); | |
846 | struct sk_buff *skb; | |
847 | unsigned int maxfraglen, fragheaderlen; | |
848 | int exthdrlen; | |
849 | int hh_len; | |
850 | int mtu; | |
851 | int copy; | |
852 | int err; | |
853 | int offset = 0; | |
854 | int csummode = CHECKSUM_NONE; | |
855 | ||
856 | if (flags&MSG_PROBE) | |
857 | return 0; | |
858 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
859 | /* | |
860 | * setup for corking | |
861 | */ | |
862 | if (opt) { | |
863 | if (np->cork.opt == NULL) { | |
864 | np->cork.opt = kmalloc(opt->tot_len, | |
865 | sk->sk_allocation); | |
866 | if (unlikely(np->cork.opt == NULL)) | |
867 | return -ENOBUFS; | |
868 | } else if (np->cork.opt->tot_len < opt->tot_len) { | |
869 | printk(KERN_DEBUG "ip6_append_data: invalid option length\n"); | |
870 | return -EINVAL; | |
871 | } | |
872 | memcpy(np->cork.opt, opt, opt->tot_len); | |
873 | inet->cork.flags |= IPCORK_OPT; | |
874 | /* need source address above miyazawa*/ | |
875 | } | |
876 | dst_hold(&rt->u.dst); | |
877 | np->cork.rt = rt; | |
878 | inet->cork.fl = *fl; | |
879 | np->cork.hop_limit = hlimit; | |
41a1f8ea | 880 | np->cork.tclass = tclass; |
1da177e4 LT |
881 | inet->cork.fragsize = mtu = dst_mtu(rt->u.dst.path); |
882 | if (dst_allfrag(rt->u.dst.path)) | |
883 | inet->cork.flags |= IPCORK_ALLFRAG; | |
884 | inet->cork.length = 0; | |
885 | sk->sk_sndmsg_page = NULL; | |
886 | sk->sk_sndmsg_off = 0; | |
887 | exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0); | |
888 | length += exthdrlen; | |
889 | transhdrlen += exthdrlen; | |
890 | } else { | |
891 | rt = np->cork.rt; | |
892 | fl = &inet->cork.fl; | |
893 | if (inet->cork.flags & IPCORK_OPT) | |
894 | opt = np->cork.opt; | |
895 | transhdrlen = 0; | |
896 | exthdrlen = 0; | |
897 | mtu = inet->cork.fragsize; | |
898 | } | |
899 | ||
900 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); | |
901 | ||
902 | fragheaderlen = sizeof(struct ipv6hdr) + (opt ? opt->opt_nflen : 0); | |
903 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); | |
904 | ||
905 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
906 | if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { | |
907 | ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); | |
908 | return -EMSGSIZE; | |
909 | } | |
910 | } | |
911 | ||
912 | /* | |
913 | * Let's try using as much space as possible. | |
914 | * Use MTU if total length of the message fits into the MTU. | |
915 | * Otherwise, we need to reserve fragment header and | |
916 | * fragment alignment (= 8-15 octects, in total). | |
917 | * | |
918 | * Note that we may need to "move" the data from the tail of | |
919 | * of the buffer to the new fragment when we split | |
920 | * the message. | |
921 | * | |
922 | * FIXME: It may be fragmented into multiple chunks | |
923 | * at once if non-fragmentable extension headers | |
924 | * are too large. | |
925 | * --yoshfuji | |
926 | */ | |
927 | ||
928 | inet->cork.length += length; | |
e89e9cf5 AR |
929 | if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) && |
930 | (rt->u.dst.dev->features & NETIF_F_UFO)) { | |
931 | ||
932 | if(ip6_ufo_append_data(sk, getfrag, from, length, hh_len, | |
933 | fragheaderlen, transhdrlen, mtu, flags)) | |
934 | goto error; | |
935 | ||
936 | return 0; | |
937 | } | |
1da177e4 LT |
938 | |
939 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | |
940 | goto alloc_new_skb; | |
941 | ||
942 | while (length > 0) { | |
943 | /* Check if the remaining data fits into current packet. */ | |
944 | copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; | |
945 | if (copy < length) | |
946 | copy = maxfraglen - skb->len; | |
947 | ||
948 | if (copy <= 0) { | |
949 | char *data; | |
950 | unsigned int datalen; | |
951 | unsigned int fraglen; | |
952 | unsigned int fraggap; | |
953 | unsigned int alloclen; | |
954 | struct sk_buff *skb_prev; | |
955 | alloc_new_skb: | |
956 | skb_prev = skb; | |
957 | ||
958 | /* There's no room in the current skb */ | |
959 | if (skb_prev) | |
960 | fraggap = skb_prev->len - maxfraglen; | |
961 | else | |
962 | fraggap = 0; | |
963 | ||
964 | /* | |
965 | * If remaining data exceeds the mtu, | |
966 | * we know we need more fragment(s). | |
967 | */ | |
968 | datalen = length + fraggap; | |
969 | if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) | |
970 | datalen = maxfraglen - fragheaderlen; | |
971 | ||
972 | fraglen = datalen + fragheaderlen; | |
973 | if ((flags & MSG_MORE) && | |
974 | !(rt->u.dst.dev->features&NETIF_F_SG)) | |
975 | alloclen = mtu; | |
976 | else | |
977 | alloclen = datalen + fragheaderlen; | |
978 | ||
979 | /* | |
980 | * The last fragment gets additional space at tail. | |
981 | * Note: we overallocate on fragments with MSG_MODE | |
982 | * because we have no idea if we're the last one. | |
983 | */ | |
984 | if (datalen == length + fraggap) | |
985 | alloclen += rt->u.dst.trailer_len; | |
986 | ||
987 | /* | |
988 | * We just reserve space for fragment header. | |
989 | * Note: this may be overallocation if the message | |
990 | * (without MSG_MORE) fits into the MTU. | |
991 | */ | |
992 | alloclen += sizeof(struct frag_hdr); | |
993 | ||
994 | if (transhdrlen) { | |
995 | skb = sock_alloc_send_skb(sk, | |
996 | alloclen + hh_len, | |
997 | (flags & MSG_DONTWAIT), &err); | |
998 | } else { | |
999 | skb = NULL; | |
1000 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1001 | 2 * sk->sk_sndbuf) | |
1002 | skb = sock_wmalloc(sk, | |
1003 | alloclen + hh_len, 1, | |
1004 | sk->sk_allocation); | |
1005 | if (unlikely(skb == NULL)) | |
1006 | err = -ENOBUFS; | |
1007 | } | |
1008 | if (skb == NULL) | |
1009 | goto error; | |
1010 | /* | |
1011 | * Fill in the control structures | |
1012 | */ | |
1013 | skb->ip_summed = csummode; | |
1014 | skb->csum = 0; | |
1015 | /* reserve for fragmentation */ | |
1016 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); | |
1017 | ||
1018 | /* | |
1019 | * Find where to start putting bytes | |
1020 | */ | |
1021 | data = skb_put(skb, fraglen); | |
1022 | skb->nh.raw = data + exthdrlen; | |
1023 | data += fragheaderlen; | |
1024 | skb->h.raw = data + exthdrlen; | |
1025 | ||
1026 | if (fraggap) { | |
1027 | skb->csum = skb_copy_and_csum_bits( | |
1028 | skb_prev, maxfraglen, | |
1029 | data + transhdrlen, fraggap, 0); | |
1030 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1031 | skb->csum); | |
1032 | data += fraggap; | |
1033 | skb_trim(skb_prev, maxfraglen); | |
1034 | } | |
1035 | copy = datalen - transhdrlen - fraggap; | |
1036 | if (copy < 0) { | |
1037 | err = -EINVAL; | |
1038 | kfree_skb(skb); | |
1039 | goto error; | |
1040 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1041 | err = -EFAULT; | |
1042 | kfree_skb(skb); | |
1043 | goto error; | |
1044 | } | |
1045 | ||
1046 | offset += copy; | |
1047 | length -= datalen - fraggap; | |
1048 | transhdrlen = 0; | |
1049 | exthdrlen = 0; | |
1050 | csummode = CHECKSUM_NONE; | |
1051 | ||
1052 | /* | |
1053 | * Put the packet on the pending queue | |
1054 | */ | |
1055 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1056 | continue; | |
1057 | } | |
1058 | ||
1059 | if (copy > length) | |
1060 | copy = length; | |
1061 | ||
1062 | if (!(rt->u.dst.dev->features&NETIF_F_SG)) { | |
1063 | unsigned int off; | |
1064 | ||
1065 | off = skb->len; | |
1066 | if (getfrag(from, skb_put(skb, copy), | |
1067 | offset, copy, off, skb) < 0) { | |
1068 | __skb_trim(skb, off); | |
1069 | err = -EFAULT; | |
1070 | goto error; | |
1071 | } | |
1072 | } else { | |
1073 | int i = skb_shinfo(skb)->nr_frags; | |
1074 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1075 | struct page *page = sk->sk_sndmsg_page; | |
1076 | int off = sk->sk_sndmsg_off; | |
1077 | unsigned int left; | |
1078 | ||
1079 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1080 | if (copy >= left) | |
1081 | copy = left; | |
1082 | if (page != frag->page) { | |
1083 | if (i == MAX_SKB_FRAGS) { | |
1084 | err = -EMSGSIZE; | |
1085 | goto error; | |
1086 | } | |
1087 | get_page(page); | |
1088 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); | |
1089 | frag = &skb_shinfo(skb)->frags[i]; | |
1090 | } | |
1091 | } else if(i < MAX_SKB_FRAGS) { | |
1092 | if (copy > PAGE_SIZE) | |
1093 | copy = PAGE_SIZE; | |
1094 | page = alloc_pages(sk->sk_allocation, 0); | |
1095 | if (page == NULL) { | |
1096 | err = -ENOMEM; | |
1097 | goto error; | |
1098 | } | |
1099 | sk->sk_sndmsg_page = page; | |
1100 | sk->sk_sndmsg_off = 0; | |
1101 | ||
1102 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1103 | frag = &skb_shinfo(skb)->frags[i]; | |
1104 | skb->truesize += PAGE_SIZE; | |
1105 | atomic_add(PAGE_SIZE, &sk->sk_wmem_alloc); | |
1106 | } else { | |
1107 | err = -EMSGSIZE; | |
1108 | goto error; | |
1109 | } | |
1110 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { | |
1111 | err = -EFAULT; | |
1112 | goto error; | |
1113 | } | |
1114 | sk->sk_sndmsg_off += copy; | |
1115 | frag->size += copy; | |
1116 | skb->len += copy; | |
1117 | skb->data_len += copy; | |
1118 | } | |
1119 | offset += copy; | |
1120 | length -= copy; | |
1121 | } | |
1122 | return 0; | |
1123 | error: | |
1124 | inet->cork.length -= length; | |
1125 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
1126 | return err; | |
1127 | } | |
1128 | ||
1129 | int ip6_push_pending_frames(struct sock *sk) | |
1130 | { | |
1131 | struct sk_buff *skb, *tmp_skb; | |
1132 | struct sk_buff **tail_skb; | |
1133 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1134 | struct inet_sock *inet = inet_sk(sk); | |
1135 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1136 | struct ipv6hdr *hdr; | |
1137 | struct ipv6_txoptions *opt = np->cork.opt; | |
1138 | struct rt6_info *rt = np->cork.rt; | |
1139 | struct flowi *fl = &inet->cork.fl; | |
1140 | unsigned char proto = fl->proto; | |
1141 | int err = 0; | |
1142 | ||
1143 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1144 | goto out; | |
1145 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1146 | ||
1147 | /* move skb->data to ip header from ext header */ | |
1148 | if (skb->data < skb->nh.raw) | |
1149 | __skb_pull(skb, skb->nh.raw - skb->data); | |
1150 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { | |
1151 | __skb_pull(tmp_skb, skb->h.raw - skb->nh.raw); | |
1152 | *tail_skb = tmp_skb; | |
1153 | tail_skb = &(tmp_skb->next); | |
1154 | skb->len += tmp_skb->len; | |
1155 | skb->data_len += tmp_skb->len; | |
1da177e4 LT |
1156 | skb->truesize += tmp_skb->truesize; |
1157 | __sock_put(tmp_skb->sk); | |
1158 | tmp_skb->destructor = NULL; | |
1159 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1160 | } |
1161 | ||
1162 | ipv6_addr_copy(final_dst, &fl->fl6_dst); | |
1163 | __skb_pull(skb, skb->h.raw - skb->nh.raw); | |
1164 | if (opt && opt->opt_flen) | |
1165 | ipv6_push_frag_opts(skb, opt, &proto); | |
1166 | if (opt && opt->opt_nflen) | |
1167 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1168 | ||
1169 | skb->nh.ipv6h = hdr = (struct ipv6hdr*) skb_push(skb, sizeof(struct ipv6hdr)); | |
1170 | ||
41a1f8ea YH |
1171 | *(u32*)hdr = fl->fl6_flowlabel | |
1172 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); | |
1da177e4 LT |
1173 | |
1174 | if (skb->len <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) | |
1175 | hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
1176 | else | |
1177 | hdr->payload_len = 0; | |
1178 | hdr->hop_limit = np->cork.hop_limit; | |
1179 | hdr->nexthdr = proto; | |
1180 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
1181 | ipv6_addr_copy(&hdr->daddr, final_dst); | |
1182 | ||
1183 | skb->dst = dst_clone(&rt->u.dst); | |
1184 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
1185 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dst->dev, dst_output); | |
1186 | if (err) { | |
1187 | if (err > 0) | |
3320da89 | 1188 | err = np->recverr ? net_xmit_errno(err) : 0; |
1da177e4 LT |
1189 | if (err) |
1190 | goto error; | |
1191 | } | |
1192 | ||
1193 | out: | |
1194 | inet->cork.flags &= ~IPCORK_OPT; | |
a51482bd JJ |
1195 | kfree(np->cork.opt); |
1196 | np->cork.opt = NULL; | |
1da177e4 LT |
1197 | if (np->cork.rt) { |
1198 | dst_release(&np->cork.rt->u.dst); | |
1199 | np->cork.rt = NULL; | |
1200 | inet->cork.flags &= ~IPCORK_ALLFRAG; | |
1201 | } | |
1202 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1203 | return err; | |
1204 | error: | |
1205 | goto out; | |
1206 | } | |
1207 | ||
1208 | void ip6_flush_pending_frames(struct sock *sk) | |
1209 | { | |
1210 | struct inet_sock *inet = inet_sk(sk); | |
1211 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1212 | struct sk_buff *skb; | |
1213 | ||
1214 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
1215 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
1216 | kfree_skb(skb); | |
1217 | } | |
1218 | ||
1219 | inet->cork.flags &= ~IPCORK_OPT; | |
1220 | ||
a51482bd JJ |
1221 | kfree(np->cork.opt); |
1222 | np->cork.opt = NULL; | |
1da177e4 LT |
1223 | if (np->cork.rt) { |
1224 | dst_release(&np->cork.rt->u.dst); | |
1225 | np->cork.rt = NULL; | |
1226 | inet->cork.flags &= ~IPCORK_ALLFRAG; | |
1227 | } | |
1228 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1229 | } |