diff options
Diffstat (limited to 'net/ipv6/ip6_output.c')
-rw-r--r-- | net/ipv6/ip6_output.c | 1197 |
1 files changed, 1197 insertions, 0 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c new file mode 100644 index 000000000000..49208ba75094 --- /dev/null +++ b/net/ipv6/ip6_output.c | |||
@@ -0,0 +1,1197 @@ | |||
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 | { | ||
150 | if (skb->len > dst_mtu(skb->dst) || dst_allfrag(skb->dst)) | ||
151 | return ip6_fragment(skb, ip6_output2); | ||
152 | else | ||
153 | return ip6_output2(skb); | ||
154 | } | ||
155 | |||
156 | #ifdef CONFIG_NETFILTER | ||
157 | int ip6_route_me_harder(struct sk_buff *skb) | ||
158 | { | ||
159 | struct ipv6hdr *iph = skb->nh.ipv6h; | ||
160 | struct dst_entry *dst; | ||
161 | struct flowi fl = { | ||
162 | .oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, | ||
163 | .nl_u = | ||
164 | { .ip6_u = | ||
165 | { .daddr = iph->daddr, | ||
166 | .saddr = iph->saddr, } }, | ||
167 | .proto = iph->nexthdr, | ||
168 | }; | ||
169 | |||
170 | dst = ip6_route_output(skb->sk, &fl); | ||
171 | |||
172 | if (dst->error) { | ||
173 | IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES); | ||
174 | LIMIT_NETDEBUG( | ||
175 | printk(KERN_DEBUG "ip6_route_me_harder: No more route.\n")); | ||
176 | dst_release(dst); | ||
177 | return -EINVAL; | ||
178 | } | ||
179 | |||
180 | /* Drop old route. */ | ||
181 | dst_release(skb->dst); | ||
182 | |||
183 | skb->dst = dst; | ||
184 | return 0; | ||
185 | } | ||
186 | #endif | ||
187 | |||
188 | static inline int ip6_maybe_reroute(struct sk_buff *skb) | ||
189 | { | ||
190 | #ifdef CONFIG_NETFILTER | ||
191 | if (skb->nfcache & NFC_ALTERED){ | ||
192 | if (ip6_route_me_harder(skb) != 0){ | ||
193 | kfree_skb(skb); | ||
194 | return -EINVAL; | ||
195 | } | ||
196 | } | ||
197 | #endif /* CONFIG_NETFILTER */ | ||
198 | return dst_output(skb); | ||
199 | } | ||
200 | |||
201 | /* | ||
202 | * xmit an sk_buff (used by TCP) | ||
203 | */ | ||
204 | |||
205 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, | ||
206 | struct ipv6_txoptions *opt, int ipfragok) | ||
207 | { | ||
208 | struct ipv6_pinfo *np = sk ? inet6_sk(sk) : NULL; | ||
209 | struct in6_addr *first_hop = &fl->fl6_dst; | ||
210 | struct dst_entry *dst = skb->dst; | ||
211 | struct ipv6hdr *hdr; | ||
212 | u8 proto = fl->proto; | ||
213 | int seg_len = skb->len; | ||
214 | int hlimit; | ||
215 | u32 mtu; | ||
216 | |||
217 | if (opt) { | ||
218 | int head_room; | ||
219 | |||
220 | /* First: exthdrs may take lots of space (~8K for now) | ||
221 | MAX_HEADER is not enough. | ||
222 | */ | ||
223 | head_room = opt->opt_nflen + opt->opt_flen; | ||
224 | seg_len += head_room; | ||
225 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | ||
226 | |||
227 | if (skb_headroom(skb) < head_room) { | ||
228 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | ||
229 | kfree_skb(skb); | ||
230 | skb = skb2; | ||
231 | if (skb == NULL) { | ||
232 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | ||
233 | return -ENOBUFS; | ||
234 | } | ||
235 | if (sk) | ||
236 | skb_set_owner_w(skb, sk); | ||
237 | } | ||
238 | if (opt->opt_flen) | ||
239 | ipv6_push_frag_opts(skb, opt, &proto); | ||
240 | if (opt->opt_nflen) | ||
241 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | ||
242 | } | ||
243 | |||
244 | hdr = skb->nh.ipv6h = (struct ipv6hdr*)skb_push(skb, sizeof(struct ipv6hdr)); | ||
245 | |||
246 | /* | ||
247 | * Fill in the IPv6 header | ||
248 | */ | ||
249 | |||
250 | *(u32*)hdr = htonl(0x60000000) | fl->fl6_flowlabel; | ||
251 | hlimit = -1; | ||
252 | if (np) | ||
253 | hlimit = np->hop_limit; | ||
254 | if (hlimit < 0) | ||
255 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); | ||
256 | if (hlimit < 0) | ||
257 | hlimit = ipv6_get_hoplimit(dst->dev); | ||
258 | |||
259 | hdr->payload_len = htons(seg_len); | ||
260 | hdr->nexthdr = proto; | ||
261 | hdr->hop_limit = hlimit; | ||
262 | |||
263 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | ||
264 | ipv6_addr_copy(&hdr->daddr, first_hop); | ||
265 | |||
266 | mtu = dst_mtu(dst); | ||
267 | if ((skb->len <= mtu) || ipfragok) { | ||
268 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | ||
269 | return NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, ip6_maybe_reroute); | ||
270 | } | ||
271 | |||
272 | if (net_ratelimit()) | ||
273 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | ||
274 | skb->dev = dst->dev; | ||
275 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); | ||
276 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | ||
277 | kfree_skb(skb); | ||
278 | return -EMSGSIZE; | ||
279 | } | ||
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 | struct in6_addr *saddr, 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 | hdr = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr)); | ||
302 | skb->nh.ipv6h = hdr; | ||
303 | |||
304 | *(u32*)hdr = htonl(0x60000000); | ||
305 | |||
306 | hdr->payload_len = htons(len); | ||
307 | hdr->nexthdr = proto; | ||
308 | hdr->hop_limit = np->hop_limit; | ||
309 | |||
310 | ipv6_addr_copy(&hdr->saddr, saddr); | ||
311 | ipv6_addr_copy(&hdr->daddr, daddr); | ||
312 | |||
313 | return 0; | ||
314 | } | ||
315 | |||
316 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | ||
317 | { | ||
318 | struct ip6_ra_chain *ra; | ||
319 | struct sock *last = NULL; | ||
320 | |||
321 | read_lock(&ip6_ra_lock); | ||
322 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | ||
323 | struct sock *sk = ra->sk; | ||
324 | if (sk && ra->sel == sel) { | ||
325 | if (last) { | ||
326 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | ||
327 | if (skb2) | ||
328 | rawv6_rcv(last, skb2); | ||
329 | } | ||
330 | last = sk; | ||
331 | } | ||
332 | } | ||
333 | |||
334 | if (last) { | ||
335 | rawv6_rcv(last, skb); | ||
336 | read_unlock(&ip6_ra_lock); | ||
337 | return 1; | ||
338 | } | ||
339 | read_unlock(&ip6_ra_lock); | ||
340 | return 0; | ||
341 | } | ||
342 | |||
343 | static inline int ip6_forward_finish(struct sk_buff *skb) | ||
344 | { | ||
345 | return dst_output(skb); | ||
346 | } | ||
347 | |||
348 | int ip6_forward(struct sk_buff *skb) | ||
349 | { | ||
350 | struct dst_entry *dst = skb->dst; | ||
351 | struct ipv6hdr *hdr = skb->nh.ipv6h; | ||
352 | struct inet6_skb_parm *opt = IP6CB(skb); | ||
353 | |||
354 | if (ipv6_devconf.forwarding == 0) | ||
355 | goto error; | ||
356 | |||
357 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { | ||
358 | IP6_INC_STATS(IPSTATS_MIB_INDISCARDS); | ||
359 | goto drop; | ||
360 | } | ||
361 | |||
362 | skb->ip_summed = CHECKSUM_NONE; | ||
363 | |||
364 | /* | ||
365 | * We DO NOT make any processing on | ||
366 | * RA packets, pushing them to user level AS IS | ||
367 | * without ane WARRANTY that application will be able | ||
368 | * to interpret them. The reason is that we | ||
369 | * cannot make anything clever here. | ||
370 | * | ||
371 | * We are not end-node, so that if packet contains | ||
372 | * AH/ESP, we cannot make anything. | ||
373 | * Defragmentation also would be mistake, RA packets | ||
374 | * cannot be fragmented, because there is no warranty | ||
375 | * that different fragments will go along one path. --ANK | ||
376 | */ | ||
377 | if (opt->ra) { | ||
378 | u8 *ptr = skb->nh.raw + opt->ra; | ||
379 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) | ||
380 | return 0; | ||
381 | } | ||
382 | |||
383 | /* | ||
384 | * check and decrement ttl | ||
385 | */ | ||
386 | if (hdr->hop_limit <= 1) { | ||
387 | /* Force OUTPUT device used as source address */ | ||
388 | skb->dev = dst->dev; | ||
389 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | ||
390 | 0, skb->dev); | ||
391 | |||
392 | kfree_skb(skb); | ||
393 | return -ETIMEDOUT; | ||
394 | } | ||
395 | |||
396 | if (!xfrm6_route_forward(skb)) { | ||
397 | IP6_INC_STATS(IPSTATS_MIB_INDISCARDS); | ||
398 | goto drop; | ||
399 | } | ||
400 | dst = skb->dst; | ||
401 | |||
402 | /* IPv6 specs say nothing about it, but it is clear that we cannot | ||
403 | send redirects to source routed frames. | ||
404 | */ | ||
405 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0) { | ||
406 | struct in6_addr *target = NULL; | ||
407 | struct rt6_info *rt; | ||
408 | struct neighbour *n = dst->neighbour; | ||
409 | |||
410 | /* | ||
411 | * incoming and outgoing devices are the same | ||
412 | * send a redirect. | ||
413 | */ | ||
414 | |||
415 | rt = (struct rt6_info *) dst; | ||
416 | if ((rt->rt6i_flags & RTF_GATEWAY)) | ||
417 | target = (struct in6_addr*)&n->primary_key; | ||
418 | else | ||
419 | target = &hdr->daddr; | ||
420 | |||
421 | /* Limit redirects both by destination (here) | ||
422 | and by source (inside ndisc_send_redirect) | ||
423 | */ | ||
424 | if (xrlim_allow(dst, 1*HZ)) | ||
425 | ndisc_send_redirect(skb, n, target); | ||
426 | } else if (ipv6_addr_type(&hdr->saddr)&(IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK | ||
427 | |IPV6_ADDR_LINKLOCAL)) { | ||
428 | /* This check is security critical. */ | ||
429 | goto error; | ||
430 | } | ||
431 | |||
432 | if (skb->len > dst_mtu(dst)) { | ||
433 | /* Again, force OUTPUT device used as source address */ | ||
434 | skb->dev = dst->dev; | ||
435 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); | ||
436 | IP6_INC_STATS_BH(IPSTATS_MIB_INTOOBIGERRORS); | ||
437 | IP6_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | ||
438 | kfree_skb(skb); | ||
439 | return -EMSGSIZE; | ||
440 | } | ||
441 | |||
442 | if (skb_cow(skb, dst->dev->hard_header_len)) { | ||
443 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | ||
444 | goto drop; | ||
445 | } | ||
446 | |||
447 | hdr = skb->nh.ipv6h; | ||
448 | |||
449 | /* Mangling hops number delayed to point after skb COW */ | ||
450 | |||
451 | hdr->hop_limit--; | ||
452 | |||
453 | IP6_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | ||
454 | return NF_HOOK(PF_INET6,NF_IP6_FORWARD, skb, skb->dev, dst->dev, ip6_forward_finish); | ||
455 | |||
456 | error: | ||
457 | IP6_INC_STATS_BH(IPSTATS_MIB_INADDRERRORS); | ||
458 | drop: | ||
459 | kfree_skb(skb); | ||
460 | return -EINVAL; | ||
461 | } | ||
462 | |||
463 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | ||
464 | { | ||
465 | to->pkt_type = from->pkt_type; | ||
466 | to->priority = from->priority; | ||
467 | to->protocol = from->protocol; | ||
468 | to->security = from->security; | ||
469 | dst_release(to->dst); | ||
470 | to->dst = dst_clone(from->dst); | ||
471 | to->dev = from->dev; | ||
472 | |||
473 | #ifdef CONFIG_NET_SCHED | ||
474 | to->tc_index = from->tc_index; | ||
475 | #endif | ||
476 | #ifdef CONFIG_NETFILTER | ||
477 | to->nfmark = from->nfmark; | ||
478 | /* Connection association is same as pre-frag packet */ | ||
479 | to->nfct = from->nfct; | ||
480 | nf_conntrack_get(to->nfct); | ||
481 | to->nfctinfo = from->nfctinfo; | ||
482 | #ifdef CONFIG_BRIDGE_NETFILTER | ||
483 | nf_bridge_put(to->nf_bridge); | ||
484 | to->nf_bridge = from->nf_bridge; | ||
485 | nf_bridge_get(to->nf_bridge); | ||
486 | #endif | ||
487 | #ifdef CONFIG_NETFILTER_DEBUG | ||
488 | to->nf_debug = from->nf_debug; | ||
489 | #endif | ||
490 | #endif | ||
491 | } | ||
492 | |||
493 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | ||
494 | { | ||
495 | u16 offset = sizeof(struct ipv6hdr); | ||
496 | struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1); | ||
497 | unsigned int packet_len = skb->tail - skb->nh.raw; | ||
498 | int found_rhdr = 0; | ||
499 | *nexthdr = &skb->nh.ipv6h->nexthdr; | ||
500 | |||
501 | while (offset + 1 <= packet_len) { | ||
502 | |||
503 | switch (**nexthdr) { | ||
504 | |||
505 | case NEXTHDR_HOP: | ||
506 | case NEXTHDR_ROUTING: | ||
507 | case NEXTHDR_DEST: | ||
508 | if (**nexthdr == NEXTHDR_ROUTING) found_rhdr = 1; | ||
509 | if (**nexthdr == NEXTHDR_DEST && found_rhdr) return offset; | ||
510 | offset += ipv6_optlen(exthdr); | ||
511 | *nexthdr = &exthdr->nexthdr; | ||
512 | exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); | ||
513 | break; | ||
514 | default : | ||
515 | return offset; | ||
516 | } | ||
517 | } | ||
518 | |||
519 | return offset; | ||
520 | } | ||
521 | |||
522 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) | ||
523 | { | ||
524 | struct net_device *dev; | ||
525 | struct sk_buff *frag; | ||
526 | struct rt6_info *rt = (struct rt6_info*)skb->dst; | ||
527 | struct ipv6hdr *tmp_hdr; | ||
528 | struct frag_hdr *fh; | ||
529 | unsigned int mtu, hlen, left, len; | ||
530 | u32 frag_id = 0; | ||
531 | int ptr, offset = 0, err=0; | ||
532 | u8 *prevhdr, nexthdr = 0; | ||
533 | |||
534 | dev = rt->u.dst.dev; | ||
535 | hlen = ip6_find_1stfragopt(skb, &prevhdr); | ||
536 | nexthdr = *prevhdr; | ||
537 | |||
538 | mtu = dst_mtu(&rt->u.dst) - hlen - sizeof(struct frag_hdr); | ||
539 | |||
540 | if (skb_shinfo(skb)->frag_list) { | ||
541 | int first_len = skb_pagelen(skb); | ||
542 | |||
543 | if (first_len - hlen > mtu || | ||
544 | ((first_len - hlen) & 7) || | ||
545 | skb_cloned(skb)) | ||
546 | goto slow_path; | ||
547 | |||
548 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { | ||
549 | /* Correct geometry. */ | ||
550 | if (frag->len > mtu || | ||
551 | ((frag->len & 7) && frag->next) || | ||
552 | skb_headroom(frag) < hlen) | ||
553 | goto slow_path; | ||
554 | |||
555 | /* Correct socket ownership. */ | ||
556 | if (frag->sk == NULL) | ||
557 | goto slow_path; | ||
558 | |||
559 | /* Partially cloned skb? */ | ||
560 | if (skb_shared(frag)) | ||
561 | goto slow_path; | ||
562 | } | ||
563 | |||
564 | err = 0; | ||
565 | offset = 0; | ||
566 | frag = skb_shinfo(skb)->frag_list; | ||
567 | skb_shinfo(skb)->frag_list = NULL; | ||
568 | /* BUILD HEADER */ | ||
569 | |||
570 | tmp_hdr = kmalloc(hlen, GFP_ATOMIC); | ||
571 | if (!tmp_hdr) { | ||
572 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | ||
573 | return -ENOMEM; | ||
574 | } | ||
575 | |||
576 | *prevhdr = NEXTHDR_FRAGMENT; | ||
577 | memcpy(tmp_hdr, skb->nh.raw, hlen); | ||
578 | __skb_pull(skb, hlen); | ||
579 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | ||
580 | skb->nh.raw = __skb_push(skb, hlen); | ||
581 | memcpy(skb->nh.raw, tmp_hdr, hlen); | ||
582 | |||
583 | ipv6_select_ident(skb, fh); | ||
584 | fh->nexthdr = nexthdr; | ||
585 | fh->reserved = 0; | ||
586 | fh->frag_off = htons(IP6_MF); | ||
587 | frag_id = fh->identification; | ||
588 | |||
589 | first_len = skb_pagelen(skb); | ||
590 | skb->data_len = first_len - skb_headlen(skb); | ||
591 | skb->len = first_len; | ||
592 | skb->nh.ipv6h->payload_len = htons(first_len - sizeof(struct ipv6hdr)); | ||
593 | |||
594 | |||
595 | for (;;) { | ||
596 | /* Prepare header of the next frame, | ||
597 | * before previous one went down. */ | ||
598 | if (frag) { | ||
599 | frag->ip_summed = CHECKSUM_NONE; | ||
600 | frag->h.raw = frag->data; | ||
601 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); | ||
602 | frag->nh.raw = __skb_push(frag, hlen); | ||
603 | memcpy(frag->nh.raw, tmp_hdr, hlen); | ||
604 | offset += skb->len - hlen - sizeof(struct frag_hdr); | ||
605 | fh->nexthdr = nexthdr; | ||
606 | fh->reserved = 0; | ||
607 | fh->frag_off = htons(offset); | ||
608 | if (frag->next != NULL) | ||
609 | fh->frag_off |= htons(IP6_MF); | ||
610 | fh->identification = frag_id; | ||
611 | frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | ||
612 | ip6_copy_metadata(frag, skb); | ||
613 | } | ||
614 | |||
615 | err = output(skb); | ||
616 | if (err || !frag) | ||
617 | break; | ||
618 | |||
619 | skb = frag; | ||
620 | frag = skb->next; | ||
621 | skb->next = NULL; | ||
622 | } | ||
623 | |||
624 | if (tmp_hdr) | ||
625 | kfree(tmp_hdr); | ||
626 | |||
627 | if (err == 0) { | ||
628 | IP6_INC_STATS(IPSTATS_MIB_FRAGOKS); | ||
629 | return 0; | ||
630 | } | ||
631 | |||
632 | while (frag) { | ||
633 | skb = frag->next; | ||
634 | kfree_skb(frag); | ||
635 | frag = skb; | ||
636 | } | ||
637 | |||
638 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | ||
639 | return err; | ||
640 | } | ||
641 | |||
642 | slow_path: | ||
643 | left = skb->len - hlen; /* Space per frame */ | ||
644 | ptr = hlen; /* Where to start from */ | ||
645 | |||
646 | /* | ||
647 | * Fragment the datagram. | ||
648 | */ | ||
649 | |||
650 | *prevhdr = NEXTHDR_FRAGMENT; | ||
651 | |||
652 | /* | ||
653 | * Keep copying data until we run out. | ||
654 | */ | ||
655 | while(left > 0) { | ||
656 | len = left; | ||
657 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | ||
658 | if (len > mtu) | ||
659 | len = mtu; | ||
660 | /* IF: we are not sending upto and including the packet end | ||
661 | then align the next start on an eight byte boundary */ | ||
662 | if (len < left) { | ||
663 | len &= ~7; | ||
664 | } | ||
665 | /* | ||
666 | * Allocate buffer. | ||
667 | */ | ||
668 | |||
669 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_RESERVED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) { | ||
670 | NETDEBUG(printk(KERN_INFO "IPv6: frag: no memory for new fragment!\n")); | ||
671 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | ||
672 | err = -ENOMEM; | ||
673 | goto fail; | ||
674 | } | ||
675 | |||
676 | /* | ||
677 | * Set up data on packet | ||
678 | */ | ||
679 | |||
680 | ip6_copy_metadata(frag, skb); | ||
681 | skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); | ||
682 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); | ||
683 | frag->nh.raw = frag->data; | ||
684 | fh = (struct frag_hdr*)(frag->data + hlen); | ||
685 | frag->h.raw = frag->data + hlen + sizeof(struct frag_hdr); | ||
686 | |||
687 | /* | ||
688 | * Charge the memory for the fragment to any owner | ||
689 | * it might possess | ||
690 | */ | ||
691 | if (skb->sk) | ||
692 | skb_set_owner_w(frag, skb->sk); | ||
693 | |||
694 | /* | ||
695 | * Copy the packet header into the new buffer. | ||
696 | */ | ||
697 | memcpy(frag->nh.raw, skb->data, hlen); | ||
698 | |||
699 | /* | ||
700 | * Build fragment header. | ||
701 | */ | ||
702 | fh->nexthdr = nexthdr; | ||
703 | fh->reserved = 0; | ||
704 | if (frag_id) { | ||
705 | ipv6_select_ident(skb, fh); | ||
706 | frag_id = fh->identification; | ||
707 | } else | ||
708 | fh->identification = frag_id; | ||
709 | |||
710 | /* | ||
711 | * Copy a block of the IP datagram. | ||
712 | */ | ||
713 | if (skb_copy_bits(skb, ptr, frag->h.raw, len)) | ||
714 | BUG(); | ||
715 | left -= len; | ||
716 | |||
717 | fh->frag_off = htons(offset); | ||
718 | if (left > 0) | ||
719 | fh->frag_off |= htons(IP6_MF); | ||
720 | frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | ||
721 | |||
722 | ptr += len; | ||
723 | offset += len; | ||
724 | |||
725 | /* | ||
726 | * Put this fragment into the sending queue. | ||
727 | */ | ||
728 | |||
729 | IP6_INC_STATS(IPSTATS_MIB_FRAGCREATES); | ||
730 | |||
731 | err = output(frag); | ||
732 | if (err) | ||
733 | goto fail; | ||
734 | } | ||
735 | kfree_skb(skb); | ||
736 | IP6_INC_STATS(IPSTATS_MIB_FRAGOKS); | ||
737 | return err; | ||
738 | |||
739 | fail: | ||
740 | kfree_skb(skb); | ||
741 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | ||
742 | return err; | ||
743 | } | ||
744 | |||
745 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) | ||
746 | { | ||
747 | int err = 0; | ||
748 | |||
749 | *dst = NULL; | ||
750 | if (sk) { | ||
751 | struct ipv6_pinfo *np = inet6_sk(sk); | ||
752 | |||
753 | *dst = sk_dst_check(sk, np->dst_cookie); | ||
754 | if (*dst) { | ||
755 | struct rt6_info *rt = (struct rt6_info*)*dst; | ||
756 | |||
757 | /* Yes, checking route validity in not connected | ||
758 | case is not very simple. Take into account, | ||
759 | that we do not support routing by source, TOS, | ||
760 | and MSG_DONTROUTE --ANK (980726) | ||
761 | |||
762 | 1. If route was host route, check that | ||
763 | cached destination is current. | ||
764 | If it is network route, we still may | ||
765 | check its validity using saved pointer | ||
766 | to the last used address: daddr_cache. | ||
767 | We do not want to save whole address now, | ||
768 | (because main consumer of this service | ||
769 | is tcp, which has not this problem), | ||
770 | so that the last trick works only on connected | ||
771 | sockets. | ||
772 | 2. oif also should be the same. | ||
773 | */ | ||
774 | |||
775 | if (((rt->rt6i_dst.plen != 128 || | ||
776 | !ipv6_addr_equal(&fl->fl6_dst, &rt->rt6i_dst.addr)) | ||
777 | && (np->daddr_cache == NULL || | ||
778 | !ipv6_addr_equal(&fl->fl6_dst, np->daddr_cache))) | ||
779 | || (fl->oif && fl->oif != (*dst)->dev->ifindex)) { | ||
780 | dst_release(*dst); | ||
781 | *dst = NULL; | ||
782 | } | ||
783 | } | ||
784 | } | ||
785 | |||
786 | if (*dst == NULL) | ||
787 | *dst = ip6_route_output(sk, fl); | ||
788 | |||
789 | if ((err = (*dst)->error)) | ||
790 | goto out_err_release; | ||
791 | |||
792 | if (ipv6_addr_any(&fl->fl6_src)) { | ||
793 | err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src); | ||
794 | |||
795 | if (err) { | ||
796 | #if IP6_DEBUG >= 2 | ||
797 | printk(KERN_DEBUG "ip6_dst_lookup: " | ||
798 | "no available source address\n"); | ||
799 | #endif | ||
800 | goto out_err_release; | ||
801 | } | ||
802 | } | ||
803 | |||
804 | return 0; | ||
805 | |||
806 | out_err_release: | ||
807 | dst_release(*dst); | ||
808 | *dst = NULL; | ||
809 | return err; | ||
810 | } | ||
811 | |||
812 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, int offset, int len, int odd, struct sk_buff *skb), | ||
813 | void *from, int length, int transhdrlen, | ||
814 | int hlimit, struct ipv6_txoptions *opt, struct flowi *fl, struct rt6_info *rt, | ||
815 | unsigned int flags) | ||
816 | { | ||
817 | struct inet_sock *inet = inet_sk(sk); | ||
818 | struct ipv6_pinfo *np = inet6_sk(sk); | ||
819 | struct sk_buff *skb; | ||
820 | unsigned int maxfraglen, fragheaderlen; | ||
821 | int exthdrlen; | ||
822 | int hh_len; | ||
823 | int mtu; | ||
824 | int copy; | ||
825 | int err; | ||
826 | int offset = 0; | ||
827 | int csummode = CHECKSUM_NONE; | ||
828 | |||
829 | if (flags&MSG_PROBE) | ||
830 | return 0; | ||
831 | if (skb_queue_empty(&sk->sk_write_queue)) { | ||
832 | /* | ||
833 | * setup for corking | ||
834 | */ | ||
835 | if (opt) { | ||
836 | if (np->cork.opt == NULL) { | ||
837 | np->cork.opt = kmalloc(opt->tot_len, | ||
838 | sk->sk_allocation); | ||
839 | if (unlikely(np->cork.opt == NULL)) | ||
840 | return -ENOBUFS; | ||
841 | } else if (np->cork.opt->tot_len < opt->tot_len) { | ||
842 | printk(KERN_DEBUG "ip6_append_data: invalid option length\n"); | ||
843 | return -EINVAL; | ||
844 | } | ||
845 | memcpy(np->cork.opt, opt, opt->tot_len); | ||
846 | inet->cork.flags |= IPCORK_OPT; | ||
847 | /* need source address above miyazawa*/ | ||
848 | } | ||
849 | dst_hold(&rt->u.dst); | ||
850 | np->cork.rt = rt; | ||
851 | inet->cork.fl = *fl; | ||
852 | np->cork.hop_limit = hlimit; | ||
853 | inet->cork.fragsize = mtu = dst_mtu(rt->u.dst.path); | ||
854 | if (dst_allfrag(rt->u.dst.path)) | ||
855 | inet->cork.flags |= IPCORK_ALLFRAG; | ||
856 | inet->cork.length = 0; | ||
857 | sk->sk_sndmsg_page = NULL; | ||
858 | sk->sk_sndmsg_off = 0; | ||
859 | exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0); | ||
860 | length += exthdrlen; | ||
861 | transhdrlen += exthdrlen; | ||
862 | } else { | ||
863 | rt = np->cork.rt; | ||
864 | fl = &inet->cork.fl; | ||
865 | if (inet->cork.flags & IPCORK_OPT) | ||
866 | opt = np->cork.opt; | ||
867 | transhdrlen = 0; | ||
868 | exthdrlen = 0; | ||
869 | mtu = inet->cork.fragsize; | ||
870 | } | ||
871 | |||
872 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); | ||
873 | |||
874 | fragheaderlen = sizeof(struct ipv6hdr) + (opt ? opt->opt_nflen : 0); | ||
875 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); | ||
876 | |||
877 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | ||
878 | if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { | ||
879 | ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); | ||
880 | return -EMSGSIZE; | ||
881 | } | ||
882 | } | ||
883 | |||
884 | /* | ||
885 | * Let's try using as much space as possible. | ||
886 | * Use MTU if total length of the message fits into the MTU. | ||
887 | * Otherwise, we need to reserve fragment header and | ||
888 | * fragment alignment (= 8-15 octects, in total). | ||
889 | * | ||
890 | * Note that we may need to "move" the data from the tail of | ||
891 | * of the buffer to the new fragment when we split | ||
892 | * the message. | ||
893 | * | ||
894 | * FIXME: It may be fragmented into multiple chunks | ||
895 | * at once if non-fragmentable extension headers | ||
896 | * are too large. | ||
897 | * --yoshfuji | ||
898 | */ | ||
899 | |||
900 | inet->cork.length += length; | ||
901 | |||
902 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | ||
903 | goto alloc_new_skb; | ||
904 | |||
905 | while (length > 0) { | ||
906 | /* Check if the remaining data fits into current packet. */ | ||
907 | copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; | ||
908 | if (copy < length) | ||
909 | copy = maxfraglen - skb->len; | ||
910 | |||
911 | if (copy <= 0) { | ||
912 | char *data; | ||
913 | unsigned int datalen; | ||
914 | unsigned int fraglen; | ||
915 | unsigned int fraggap; | ||
916 | unsigned int alloclen; | ||
917 | struct sk_buff *skb_prev; | ||
918 | alloc_new_skb: | ||
919 | skb_prev = skb; | ||
920 | |||
921 | /* There's no room in the current skb */ | ||
922 | if (skb_prev) | ||
923 | fraggap = skb_prev->len - maxfraglen; | ||
924 | else | ||
925 | fraggap = 0; | ||
926 | |||
927 | /* | ||
928 | * If remaining data exceeds the mtu, | ||
929 | * we know we need more fragment(s). | ||
930 | */ | ||
931 | datalen = length + fraggap; | ||
932 | if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) | ||
933 | datalen = maxfraglen - fragheaderlen; | ||
934 | |||
935 | fraglen = datalen + fragheaderlen; | ||
936 | if ((flags & MSG_MORE) && | ||
937 | !(rt->u.dst.dev->features&NETIF_F_SG)) | ||
938 | alloclen = mtu; | ||
939 | else | ||
940 | alloclen = datalen + fragheaderlen; | ||
941 | |||
942 | /* | ||
943 | * The last fragment gets additional space at tail. | ||
944 | * Note: we overallocate on fragments with MSG_MODE | ||
945 | * because we have no idea if we're the last one. | ||
946 | */ | ||
947 | if (datalen == length + fraggap) | ||
948 | alloclen += rt->u.dst.trailer_len; | ||
949 | |||
950 | /* | ||
951 | * We just reserve space for fragment header. | ||
952 | * Note: this may be overallocation if the message | ||
953 | * (without MSG_MORE) fits into the MTU. | ||
954 | */ | ||
955 | alloclen += sizeof(struct frag_hdr); | ||
956 | |||
957 | if (transhdrlen) { | ||
958 | skb = sock_alloc_send_skb(sk, | ||
959 | alloclen + hh_len, | ||
960 | (flags & MSG_DONTWAIT), &err); | ||
961 | } else { | ||
962 | skb = NULL; | ||
963 | if (atomic_read(&sk->sk_wmem_alloc) <= | ||
964 | 2 * sk->sk_sndbuf) | ||
965 | skb = sock_wmalloc(sk, | ||
966 | alloclen + hh_len, 1, | ||
967 | sk->sk_allocation); | ||
968 | if (unlikely(skb == NULL)) | ||
969 | err = -ENOBUFS; | ||
970 | } | ||
971 | if (skb == NULL) | ||
972 | goto error; | ||
973 | /* | ||
974 | * Fill in the control structures | ||
975 | */ | ||
976 | skb->ip_summed = csummode; | ||
977 | skb->csum = 0; | ||
978 | /* reserve for fragmentation */ | ||
979 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); | ||
980 | |||
981 | /* | ||
982 | * Find where to start putting bytes | ||
983 | */ | ||
984 | data = skb_put(skb, fraglen); | ||
985 | skb->nh.raw = data + exthdrlen; | ||
986 | data += fragheaderlen; | ||
987 | skb->h.raw = data + exthdrlen; | ||
988 | |||
989 | if (fraggap) { | ||
990 | skb->csum = skb_copy_and_csum_bits( | ||
991 | skb_prev, maxfraglen, | ||
992 | data + transhdrlen, fraggap, 0); | ||
993 | skb_prev->csum = csum_sub(skb_prev->csum, | ||
994 | skb->csum); | ||
995 | data += fraggap; | ||
996 | skb_trim(skb_prev, maxfraglen); | ||
997 | } | ||
998 | copy = datalen - transhdrlen - fraggap; | ||
999 | if (copy < 0) { | ||
1000 | err = -EINVAL; | ||
1001 | kfree_skb(skb); | ||
1002 | goto error; | ||
1003 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | ||
1004 | err = -EFAULT; | ||
1005 | kfree_skb(skb); | ||
1006 | goto error; | ||
1007 | } | ||
1008 | |||
1009 | offset += copy; | ||
1010 | length -= datalen - fraggap; | ||
1011 | transhdrlen = 0; | ||
1012 | exthdrlen = 0; | ||
1013 | csummode = CHECKSUM_NONE; | ||
1014 | |||
1015 | /* | ||
1016 | * Put the packet on the pending queue | ||
1017 | */ | ||
1018 | __skb_queue_tail(&sk->sk_write_queue, skb); | ||
1019 | continue; | ||
1020 | } | ||
1021 | |||
1022 | if (copy > length) | ||
1023 | copy = length; | ||
1024 | |||
1025 | if (!(rt->u.dst.dev->features&NETIF_F_SG)) { | ||
1026 | unsigned int off; | ||
1027 | |||
1028 | off = skb->len; | ||
1029 | if (getfrag(from, skb_put(skb, copy), | ||
1030 | offset, copy, off, skb) < 0) { | ||
1031 | __skb_trim(skb, off); | ||
1032 | err = -EFAULT; | ||
1033 | goto error; | ||
1034 | } | ||
1035 | } else { | ||
1036 | int i = skb_shinfo(skb)->nr_frags; | ||
1037 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | ||
1038 | struct page *page = sk->sk_sndmsg_page; | ||
1039 | int off = sk->sk_sndmsg_off; | ||
1040 | unsigned int left; | ||
1041 | |||
1042 | if (page && (left = PAGE_SIZE - off) > 0) { | ||
1043 | if (copy >= left) | ||
1044 | copy = left; | ||
1045 | if (page != frag->page) { | ||
1046 | if (i == MAX_SKB_FRAGS) { | ||
1047 | err = -EMSGSIZE; | ||
1048 | goto error; | ||
1049 | } | ||
1050 | get_page(page); | ||
1051 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); | ||
1052 | frag = &skb_shinfo(skb)->frags[i]; | ||
1053 | } | ||
1054 | } else if(i < MAX_SKB_FRAGS) { | ||
1055 | if (copy > PAGE_SIZE) | ||
1056 | copy = PAGE_SIZE; | ||
1057 | page = alloc_pages(sk->sk_allocation, 0); | ||
1058 | if (page == NULL) { | ||
1059 | err = -ENOMEM; | ||
1060 | goto error; | ||
1061 | } | ||
1062 | sk->sk_sndmsg_page = page; | ||
1063 | sk->sk_sndmsg_off = 0; | ||
1064 | |||
1065 | skb_fill_page_desc(skb, i, page, 0, 0); | ||
1066 | frag = &skb_shinfo(skb)->frags[i]; | ||
1067 | skb->truesize += PAGE_SIZE; | ||
1068 | atomic_add(PAGE_SIZE, &sk->sk_wmem_alloc); | ||
1069 | } else { | ||
1070 | err = -EMSGSIZE; | ||
1071 | goto error; | ||
1072 | } | ||
1073 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { | ||
1074 | err = -EFAULT; | ||
1075 | goto error; | ||
1076 | } | ||
1077 | sk->sk_sndmsg_off += copy; | ||
1078 | frag->size += copy; | ||
1079 | skb->len += copy; | ||
1080 | skb->data_len += copy; | ||
1081 | } | ||
1082 | offset += copy; | ||
1083 | length -= copy; | ||
1084 | } | ||
1085 | return 0; | ||
1086 | error: | ||
1087 | inet->cork.length -= length; | ||
1088 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | ||
1089 | return err; | ||
1090 | } | ||
1091 | |||
1092 | int ip6_push_pending_frames(struct sock *sk) | ||
1093 | { | ||
1094 | struct sk_buff *skb, *tmp_skb; | ||
1095 | struct sk_buff **tail_skb; | ||
1096 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | ||
1097 | struct inet_sock *inet = inet_sk(sk); | ||
1098 | struct ipv6_pinfo *np = inet6_sk(sk); | ||
1099 | struct ipv6hdr *hdr; | ||
1100 | struct ipv6_txoptions *opt = np->cork.opt; | ||
1101 | struct rt6_info *rt = np->cork.rt; | ||
1102 | struct flowi *fl = &inet->cork.fl; | ||
1103 | unsigned char proto = fl->proto; | ||
1104 | int err = 0; | ||
1105 | |||
1106 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | ||
1107 | goto out; | ||
1108 | tail_skb = &(skb_shinfo(skb)->frag_list); | ||
1109 | |||
1110 | /* move skb->data to ip header from ext header */ | ||
1111 | if (skb->data < skb->nh.raw) | ||
1112 | __skb_pull(skb, skb->nh.raw - skb->data); | ||
1113 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { | ||
1114 | __skb_pull(tmp_skb, skb->h.raw - skb->nh.raw); | ||
1115 | *tail_skb = tmp_skb; | ||
1116 | tail_skb = &(tmp_skb->next); | ||
1117 | skb->len += tmp_skb->len; | ||
1118 | skb->data_len += tmp_skb->len; | ||
1119 | #if 0 /* Logically correct, but useless work, ip_fragment() will have to undo */ | ||
1120 | skb->truesize += tmp_skb->truesize; | ||
1121 | __sock_put(tmp_skb->sk); | ||
1122 | tmp_skb->destructor = NULL; | ||
1123 | tmp_skb->sk = NULL; | ||
1124 | #endif | ||
1125 | } | ||
1126 | |||
1127 | ipv6_addr_copy(final_dst, &fl->fl6_dst); | ||
1128 | __skb_pull(skb, skb->h.raw - skb->nh.raw); | ||
1129 | if (opt && opt->opt_flen) | ||
1130 | ipv6_push_frag_opts(skb, opt, &proto); | ||
1131 | if (opt && opt->opt_nflen) | ||
1132 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | ||
1133 | |||
1134 | skb->nh.ipv6h = hdr = (struct ipv6hdr*) skb_push(skb, sizeof(struct ipv6hdr)); | ||
1135 | |||
1136 | *(u32*)hdr = fl->fl6_flowlabel | htonl(0x60000000); | ||
1137 | |||
1138 | if (skb->len <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) | ||
1139 | hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | ||
1140 | else | ||
1141 | hdr->payload_len = 0; | ||
1142 | hdr->hop_limit = np->cork.hop_limit; | ||
1143 | hdr->nexthdr = proto; | ||
1144 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | ||
1145 | ipv6_addr_copy(&hdr->daddr, final_dst); | ||
1146 | |||
1147 | skb->dst = dst_clone(&rt->u.dst); | ||
1148 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | ||
1149 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dst->dev, dst_output); | ||
1150 | if (err) { | ||
1151 | if (err > 0) | ||
1152 | err = inet->recverr ? net_xmit_errno(err) : 0; | ||
1153 | if (err) | ||
1154 | goto error; | ||
1155 | } | ||
1156 | |||
1157 | out: | ||
1158 | inet->cork.flags &= ~IPCORK_OPT; | ||
1159 | if (np->cork.opt) { | ||
1160 | kfree(np->cork.opt); | ||
1161 | np->cork.opt = NULL; | ||
1162 | } | ||
1163 | if (np->cork.rt) { | ||
1164 | dst_release(&np->cork.rt->u.dst); | ||
1165 | np->cork.rt = NULL; | ||
1166 | inet->cork.flags &= ~IPCORK_ALLFRAG; | ||
1167 | } | ||
1168 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | ||
1169 | return err; | ||
1170 | error: | ||
1171 | goto out; | ||
1172 | } | ||
1173 | |||
1174 | void ip6_flush_pending_frames(struct sock *sk) | ||
1175 | { | ||
1176 | struct inet_sock *inet = inet_sk(sk); | ||
1177 | struct ipv6_pinfo *np = inet6_sk(sk); | ||
1178 | struct sk_buff *skb; | ||
1179 | |||
1180 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | ||
1181 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | ||
1182 | kfree_skb(skb); | ||
1183 | } | ||
1184 | |||
1185 | inet->cork.flags &= ~IPCORK_OPT; | ||
1186 | |||
1187 | if (np->cork.opt) { | ||
1188 | kfree(np->cork.opt); | ||
1189 | np->cork.opt = NULL; | ||
1190 | } | ||
1191 | if (np->cork.rt) { | ||
1192 | dst_release(&np->cork.rt->u.dst); | ||
1193 | np->cork.rt = NULL; | ||
1194 | inet->cork.flags &= ~IPCORK_ALLFRAG; | ||
1195 | } | ||
1196 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | ||
1197 | } | ||