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> | |
b59f45d0 | 42 | #include <linux/module.h> |
1da177e4 LT |
43 | |
44 | #include <linux/netfilter.h> | |
45 | #include <linux/netfilter_ipv6.h> | |
46 | ||
47 | #include <net/sock.h> | |
48 | #include <net/snmp.h> | |
49 | ||
50 | #include <net/ipv6.h> | |
51 | #include <net/ndisc.h> | |
52 | #include <net/protocol.h> | |
53 | #include <net/ip6_route.h> | |
54 | #include <net/addrconf.h> | |
55 | #include <net/rawv6.h> | |
56 | #include <net/icmp.h> | |
57 | #include <net/xfrm.h> | |
58 | #include <net/checksum.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 | static inline int ip6_output_finish(struct sk_buff *skb) | |
75 | { | |
76 | ||
77 | struct dst_entry *dst = skb->dst; | |
78 | struct hh_cache *hh = dst->hh; | |
79 | ||
80 | if (hh) { | |
81 | int hh_alen; | |
82 | ||
83 | read_lock_bh(&hh->hh_lock); | |
84 | hh_alen = HH_DATA_ALIGN(hh->hh_len); | |
85 | memcpy(skb->data - hh_alen, hh->hh_data, hh_alen); | |
86 | read_unlock_bh(&hh->hh_lock); | |
87 | skb_push(skb, hh->hh_len); | |
88 | return hh->hh_output(skb); | |
89 | } else if (dst->neighbour) | |
90 | return dst->neighbour->output(skb); | |
91 | ||
92 | IP6_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES); | |
93 | kfree_skb(skb); | |
94 | return -EINVAL; | |
95 | ||
96 | } | |
97 | ||
98 | /* dev_loopback_xmit for use with netfilter. */ | |
99 | static int ip6_dev_loopback_xmit(struct sk_buff *newskb) | |
100 | { | |
101 | newskb->mac.raw = newskb->data; | |
102 | __skb_pull(newskb, newskb->nh.raw - newskb->data); | |
103 | newskb->pkt_type = PACKET_LOOPBACK; | |
104 | newskb->ip_summed = CHECKSUM_UNNECESSARY; | |
105 | BUG_TRAP(newskb->dst); | |
106 | ||
107 | netif_rx(newskb); | |
108 | return 0; | |
109 | } | |
110 | ||
111 | ||
112 | static int ip6_output2(struct sk_buff *skb) | |
113 | { | |
114 | struct dst_entry *dst = skb->dst; | |
115 | struct net_device *dev = dst->dev; | |
116 | ||
117 | skb->protocol = htons(ETH_P_IPV6); | |
118 | skb->dev = dev; | |
119 | ||
120 | if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr)) { | |
121 | struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL; | |
122 | ||
123 | if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && | |
124 | ipv6_chk_mcast_addr(dev, &skb->nh.ipv6h->daddr, | |
125 | &skb->nh.ipv6h->saddr)) { | |
126 | struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); | |
127 | ||
128 | /* Do not check for IFF_ALLMULTI; multicast routing | |
129 | is not supported in any case. | |
130 | */ | |
131 | if (newskb) | |
132 | NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, newskb, NULL, | |
133 | newskb->dev, | |
134 | ip6_dev_loopback_xmit); | |
135 | ||
136 | if (skb->nh.ipv6h->hop_limit == 0) { | |
137 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
138 | kfree_skb(skb); | |
139 | return 0; | |
140 | } | |
141 | } | |
142 | ||
143 | IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); | |
144 | } | |
145 | ||
146 | return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb,NULL, skb->dev,ip6_output_finish); | |
147 | } | |
148 | ||
149 | int ip6_output(struct sk_buff *skb) | |
150 | { | |
e89e9cf5 AR |
151 | if ((skb->len > dst_mtu(skb->dst) && !skb_shinfo(skb)->ufo_size) || |
152 | dst_allfrag(skb->dst)) | |
1da177e4 LT |
153 | return ip6_fragment(skb, ip6_output2); |
154 | else | |
155 | return ip6_output2(skb); | |
156 | } | |
157 | ||
1da177e4 LT |
158 | /* |
159 | * xmit an sk_buff (used by TCP) | |
160 | */ | |
161 | ||
162 | int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, | |
163 | struct ipv6_txoptions *opt, int ipfragok) | |
164 | { | |
b30bd282 | 165 | struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 LT |
166 | struct in6_addr *first_hop = &fl->fl6_dst; |
167 | struct dst_entry *dst = skb->dst; | |
168 | struct ipv6hdr *hdr; | |
169 | u8 proto = fl->proto; | |
170 | int seg_len = skb->len; | |
41a1f8ea | 171 | int hlimit, tclass; |
1da177e4 LT |
172 | u32 mtu; |
173 | ||
174 | if (opt) { | |
175 | int head_room; | |
176 | ||
177 | /* First: exthdrs may take lots of space (~8K for now) | |
178 | MAX_HEADER is not enough. | |
179 | */ | |
180 | head_room = opt->opt_nflen + opt->opt_flen; | |
181 | seg_len += head_room; | |
182 | head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); | |
183 | ||
184 | if (skb_headroom(skb) < head_room) { | |
185 | struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); | |
186 | kfree_skb(skb); | |
187 | skb = skb2; | |
188 | if (skb == NULL) { | |
189 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
190 | return -ENOBUFS; | |
191 | } | |
192 | if (sk) | |
193 | skb_set_owner_w(skb, sk); | |
194 | } | |
195 | if (opt->opt_flen) | |
196 | ipv6_push_frag_opts(skb, opt, &proto); | |
197 | if (opt->opt_nflen) | |
198 | ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); | |
199 | } | |
200 | ||
201 | hdr = skb->nh.ipv6h = (struct ipv6hdr*)skb_push(skb, sizeof(struct ipv6hdr)); | |
202 | ||
203 | /* | |
204 | * Fill in the IPv6 header | |
205 | */ | |
206 | ||
1da177e4 LT |
207 | hlimit = -1; |
208 | if (np) | |
209 | hlimit = np->hop_limit; | |
210 | if (hlimit < 0) | |
211 | hlimit = dst_metric(dst, RTAX_HOPLIMIT); | |
212 | if (hlimit < 0) | |
213 | hlimit = ipv6_get_hoplimit(dst->dev); | |
214 | ||
41a1f8ea YH |
215 | tclass = -1; |
216 | if (np) | |
217 | tclass = np->tclass; | |
218 | if (tclass < 0) | |
219 | tclass = 0; | |
220 | ||
221 | *(u32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel; | |
222 | ||
1da177e4 LT |
223 | hdr->payload_len = htons(seg_len); |
224 | hdr->nexthdr = proto; | |
225 | hdr->hop_limit = hlimit; | |
226 | ||
227 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
228 | ipv6_addr_copy(&hdr->daddr, first_hop); | |
229 | ||
a2c2064f PM |
230 | skb->priority = sk->sk_priority; |
231 | ||
1da177e4 LT |
232 | mtu = dst_mtu(dst); |
233 | if ((skb->len <= mtu) || ipfragok) { | |
234 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
6869c4d8 HW |
235 | return NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, |
236 | dst_output); | |
1da177e4 LT |
237 | } |
238 | ||
239 | if (net_ratelimit()) | |
240 | printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); | |
241 | skb->dev = dst->dev; | |
242 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); | |
243 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
244 | kfree_skb(skb); | |
245 | return -EMSGSIZE; | |
246 | } | |
247 | ||
248 | /* | |
249 | * To avoid extra problems ND packets are send through this | |
250 | * routine. It's code duplication but I really want to avoid | |
251 | * extra checks since ipv6_build_header is used by TCP (which | |
252 | * is for us performance critical) | |
253 | */ | |
254 | ||
255 | int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, | |
256 | struct in6_addr *saddr, struct in6_addr *daddr, | |
257 | int proto, int len) | |
258 | { | |
259 | struct ipv6_pinfo *np = inet6_sk(sk); | |
260 | struct ipv6hdr *hdr; | |
261 | int totlen; | |
262 | ||
263 | skb->protocol = htons(ETH_P_IPV6); | |
264 | skb->dev = dev; | |
265 | ||
266 | totlen = len + sizeof(struct ipv6hdr); | |
267 | ||
268 | hdr = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr)); | |
269 | skb->nh.ipv6h = hdr; | |
270 | ||
271 | *(u32*)hdr = htonl(0x60000000); | |
272 | ||
273 | hdr->payload_len = htons(len); | |
274 | hdr->nexthdr = proto; | |
275 | hdr->hop_limit = np->hop_limit; | |
276 | ||
277 | ipv6_addr_copy(&hdr->saddr, saddr); | |
278 | ipv6_addr_copy(&hdr->daddr, daddr); | |
279 | ||
280 | return 0; | |
281 | } | |
282 | ||
283 | static int ip6_call_ra_chain(struct sk_buff *skb, int sel) | |
284 | { | |
285 | struct ip6_ra_chain *ra; | |
286 | struct sock *last = NULL; | |
287 | ||
288 | read_lock(&ip6_ra_lock); | |
289 | for (ra = ip6_ra_chain; ra; ra = ra->next) { | |
290 | struct sock *sk = ra->sk; | |
0bd1b59b AM |
291 | if (sk && ra->sel == sel && |
292 | (!sk->sk_bound_dev_if || | |
293 | sk->sk_bound_dev_if == skb->dev->ifindex)) { | |
1da177e4 LT |
294 | if (last) { |
295 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); | |
296 | if (skb2) | |
297 | rawv6_rcv(last, skb2); | |
298 | } | |
299 | last = sk; | |
300 | } | |
301 | } | |
302 | ||
303 | if (last) { | |
304 | rawv6_rcv(last, skb); | |
305 | read_unlock(&ip6_ra_lock); | |
306 | return 1; | |
307 | } | |
308 | read_unlock(&ip6_ra_lock); | |
309 | return 0; | |
310 | } | |
311 | ||
312 | static inline int ip6_forward_finish(struct sk_buff *skb) | |
313 | { | |
314 | return dst_output(skb); | |
315 | } | |
316 | ||
317 | int ip6_forward(struct sk_buff *skb) | |
318 | { | |
319 | struct dst_entry *dst = skb->dst; | |
320 | struct ipv6hdr *hdr = skb->nh.ipv6h; | |
321 | struct inet6_skb_parm *opt = IP6CB(skb); | |
322 | ||
323 | if (ipv6_devconf.forwarding == 0) | |
324 | goto error; | |
325 | ||
326 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { | |
327 | IP6_INC_STATS(IPSTATS_MIB_INDISCARDS); | |
328 | goto drop; | |
329 | } | |
330 | ||
331 | skb->ip_summed = CHECKSUM_NONE; | |
332 | ||
333 | /* | |
334 | * We DO NOT make any processing on | |
335 | * RA packets, pushing them to user level AS IS | |
336 | * without ane WARRANTY that application will be able | |
337 | * to interpret them. The reason is that we | |
338 | * cannot make anything clever here. | |
339 | * | |
340 | * We are not end-node, so that if packet contains | |
341 | * AH/ESP, we cannot make anything. | |
342 | * Defragmentation also would be mistake, RA packets | |
343 | * cannot be fragmented, because there is no warranty | |
344 | * that different fragments will go along one path. --ANK | |
345 | */ | |
346 | if (opt->ra) { | |
347 | u8 *ptr = skb->nh.raw + opt->ra; | |
348 | if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) | |
349 | return 0; | |
350 | } | |
351 | ||
352 | /* | |
353 | * check and decrement ttl | |
354 | */ | |
355 | if (hdr->hop_limit <= 1) { | |
356 | /* Force OUTPUT device used as source address */ | |
357 | skb->dev = dst->dev; | |
358 | icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, | |
359 | 0, skb->dev); | |
360 | ||
361 | kfree_skb(skb); | |
362 | return -ETIMEDOUT; | |
363 | } | |
364 | ||
365 | if (!xfrm6_route_forward(skb)) { | |
366 | IP6_INC_STATS(IPSTATS_MIB_INDISCARDS); | |
367 | goto drop; | |
368 | } | |
369 | dst = skb->dst; | |
370 | ||
371 | /* IPv6 specs say nothing about it, but it is clear that we cannot | |
372 | send redirects to source routed frames. | |
373 | */ | |
374 | if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0) { | |
375 | struct in6_addr *target = NULL; | |
376 | struct rt6_info *rt; | |
377 | struct neighbour *n = dst->neighbour; | |
378 | ||
379 | /* | |
380 | * incoming and outgoing devices are the same | |
381 | * send a redirect. | |
382 | */ | |
383 | ||
384 | rt = (struct rt6_info *) dst; | |
385 | if ((rt->rt6i_flags & RTF_GATEWAY)) | |
386 | target = (struct in6_addr*)&n->primary_key; | |
387 | else | |
388 | target = &hdr->daddr; | |
389 | ||
390 | /* Limit redirects both by destination (here) | |
391 | and by source (inside ndisc_send_redirect) | |
392 | */ | |
393 | if (xrlim_allow(dst, 1*HZ)) | |
394 | ndisc_send_redirect(skb, n, target); | |
395 | } else if (ipv6_addr_type(&hdr->saddr)&(IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK | |
396 | |IPV6_ADDR_LINKLOCAL)) { | |
397 | /* This check is security critical. */ | |
398 | goto error; | |
399 | } | |
400 | ||
401 | if (skb->len > dst_mtu(dst)) { | |
402 | /* Again, force OUTPUT device used as source address */ | |
403 | skb->dev = dst->dev; | |
404 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); | |
405 | IP6_INC_STATS_BH(IPSTATS_MIB_INTOOBIGERRORS); | |
406 | IP6_INC_STATS_BH(IPSTATS_MIB_FRAGFAILS); | |
407 | kfree_skb(skb); | |
408 | return -EMSGSIZE; | |
409 | } | |
410 | ||
411 | if (skb_cow(skb, dst->dev->hard_header_len)) { | |
412 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
413 | goto drop; | |
414 | } | |
415 | ||
416 | hdr = skb->nh.ipv6h; | |
417 | ||
418 | /* Mangling hops number delayed to point after skb COW */ | |
419 | ||
420 | hdr->hop_limit--; | |
421 | ||
422 | IP6_INC_STATS_BH(IPSTATS_MIB_OUTFORWDATAGRAMS); | |
423 | return NF_HOOK(PF_INET6,NF_IP6_FORWARD, skb, skb->dev, dst->dev, ip6_forward_finish); | |
424 | ||
425 | error: | |
426 | IP6_INC_STATS_BH(IPSTATS_MIB_INADDRERRORS); | |
427 | drop: | |
428 | kfree_skb(skb); | |
429 | return -EINVAL; | |
430 | } | |
431 | ||
432 | static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) | |
433 | { | |
434 | to->pkt_type = from->pkt_type; | |
435 | to->priority = from->priority; | |
436 | to->protocol = from->protocol; | |
1da177e4 LT |
437 | dst_release(to->dst); |
438 | to->dst = dst_clone(from->dst); | |
439 | to->dev = from->dev; | |
440 | ||
441 | #ifdef CONFIG_NET_SCHED | |
442 | to->tc_index = from->tc_index; | |
443 | #endif | |
444 | #ifdef CONFIG_NETFILTER | |
445 | to->nfmark = from->nfmark; | |
446 | /* Connection association is same as pre-frag packet */ | |
9fb9cbb1 | 447 | nf_conntrack_put(to->nfct); |
1da177e4 LT |
448 | to->nfct = from->nfct; |
449 | nf_conntrack_get(to->nfct); | |
450 | to->nfctinfo = from->nfctinfo; | |
9fb9cbb1 YK |
451 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
452 | nf_conntrack_put_reasm(to->nfct_reasm); | |
453 | to->nfct_reasm = from->nfct_reasm; | |
454 | nf_conntrack_get_reasm(to->nfct_reasm); | |
455 | #endif | |
1da177e4 LT |
456 | #ifdef CONFIG_BRIDGE_NETFILTER |
457 | nf_bridge_put(to->nf_bridge); | |
458 | to->nf_bridge = from->nf_bridge; | |
459 | nf_bridge_get(to->nf_bridge); | |
460 | #endif | |
1da177e4 LT |
461 | #endif |
462 | } | |
463 | ||
464 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
465 | { | |
466 | u16 offset = sizeof(struct ipv6hdr); | |
467 | struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1); | |
468 | unsigned int packet_len = skb->tail - skb->nh.raw; | |
469 | int found_rhdr = 0; | |
470 | *nexthdr = &skb->nh.ipv6h->nexthdr; | |
471 | ||
472 | while (offset + 1 <= packet_len) { | |
473 | ||
474 | switch (**nexthdr) { | |
475 | ||
476 | case NEXTHDR_HOP: | |
477 | case NEXTHDR_ROUTING: | |
478 | case NEXTHDR_DEST: | |
479 | if (**nexthdr == NEXTHDR_ROUTING) found_rhdr = 1; | |
480 | if (**nexthdr == NEXTHDR_DEST && found_rhdr) return offset; | |
481 | offset += ipv6_optlen(exthdr); | |
482 | *nexthdr = &exthdr->nexthdr; | |
483 | exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); | |
484 | break; | |
485 | default : | |
486 | return offset; | |
487 | } | |
488 | } | |
489 | ||
490 | return offset; | |
491 | } | |
b59f45d0 | 492 | EXPORT_SYMBOL_GPL(ip6_find_1stfragopt); |
1da177e4 LT |
493 | |
494 | static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) | |
495 | { | |
496 | struct net_device *dev; | |
497 | struct sk_buff *frag; | |
498 | struct rt6_info *rt = (struct rt6_info*)skb->dst; | |
d91675f9 | 499 | struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; |
1da177e4 LT |
500 | struct ipv6hdr *tmp_hdr; |
501 | struct frag_hdr *fh; | |
502 | unsigned int mtu, hlen, left, len; | |
503 | u32 frag_id = 0; | |
504 | int ptr, offset = 0, err=0; | |
505 | u8 *prevhdr, nexthdr = 0; | |
506 | ||
507 | dev = rt->u.dst.dev; | |
508 | hlen = ip6_find_1stfragopt(skb, &prevhdr); | |
509 | nexthdr = *prevhdr; | |
510 | ||
d91675f9 YH |
511 | mtu = dst_mtu(&rt->u.dst); |
512 | if (np && np->frag_size < mtu) { | |
513 | if (np->frag_size) | |
514 | mtu = np->frag_size; | |
515 | } | |
516 | mtu -= hlen + sizeof(struct frag_hdr); | |
1da177e4 LT |
517 | |
518 | if (skb_shinfo(skb)->frag_list) { | |
519 | int first_len = skb_pagelen(skb); | |
520 | ||
521 | if (first_len - hlen > mtu || | |
522 | ((first_len - hlen) & 7) || | |
523 | skb_cloned(skb)) | |
524 | goto slow_path; | |
525 | ||
526 | for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { | |
527 | /* Correct geometry. */ | |
528 | if (frag->len > mtu || | |
529 | ((frag->len & 7) && frag->next) || | |
530 | skb_headroom(frag) < hlen) | |
531 | goto slow_path; | |
532 | ||
1da177e4 LT |
533 | /* Partially cloned skb? */ |
534 | if (skb_shared(frag)) | |
535 | goto slow_path; | |
2fdba6b0 HX |
536 | |
537 | BUG_ON(frag->sk); | |
538 | if (skb->sk) { | |
539 | sock_hold(skb->sk); | |
540 | frag->sk = skb->sk; | |
541 | frag->destructor = sock_wfree; | |
542 | skb->truesize -= frag->truesize; | |
543 | } | |
1da177e4 LT |
544 | } |
545 | ||
546 | err = 0; | |
547 | offset = 0; | |
548 | frag = skb_shinfo(skb)->frag_list; | |
549 | skb_shinfo(skb)->frag_list = NULL; | |
550 | /* BUILD HEADER */ | |
551 | ||
552 | tmp_hdr = kmalloc(hlen, GFP_ATOMIC); | |
553 | if (!tmp_hdr) { | |
554 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
555 | return -ENOMEM; | |
556 | } | |
557 | ||
558 | *prevhdr = NEXTHDR_FRAGMENT; | |
559 | memcpy(tmp_hdr, skb->nh.raw, hlen); | |
560 | __skb_pull(skb, hlen); | |
561 | fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); | |
562 | skb->nh.raw = __skb_push(skb, hlen); | |
563 | memcpy(skb->nh.raw, tmp_hdr, hlen); | |
564 | ||
565 | ipv6_select_ident(skb, fh); | |
566 | fh->nexthdr = nexthdr; | |
567 | fh->reserved = 0; | |
568 | fh->frag_off = htons(IP6_MF); | |
569 | frag_id = fh->identification; | |
570 | ||
571 | first_len = skb_pagelen(skb); | |
572 | skb->data_len = first_len - skb_headlen(skb); | |
573 | skb->len = first_len; | |
574 | skb->nh.ipv6h->payload_len = htons(first_len - sizeof(struct ipv6hdr)); | |
575 | ||
576 | ||
577 | for (;;) { | |
578 | /* Prepare header of the next frame, | |
579 | * before previous one went down. */ | |
580 | if (frag) { | |
581 | frag->ip_summed = CHECKSUM_NONE; | |
582 | frag->h.raw = frag->data; | |
583 | fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); | |
584 | frag->nh.raw = __skb_push(frag, hlen); | |
585 | memcpy(frag->nh.raw, tmp_hdr, hlen); | |
586 | offset += skb->len - hlen - sizeof(struct frag_hdr); | |
587 | fh->nexthdr = nexthdr; | |
588 | fh->reserved = 0; | |
589 | fh->frag_off = htons(offset); | |
590 | if (frag->next != NULL) | |
591 | fh->frag_off |= htons(IP6_MF); | |
592 | fh->identification = frag_id; | |
593 | frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
594 | ip6_copy_metadata(frag, skb); | |
595 | } | |
596 | ||
597 | err = output(skb); | |
598 | if (err || !frag) | |
599 | break; | |
600 | ||
601 | skb = frag; | |
602 | frag = skb->next; | |
603 | skb->next = NULL; | |
604 | } | |
605 | ||
a51482bd | 606 | kfree(tmp_hdr); |
1da177e4 LT |
607 | |
608 | if (err == 0) { | |
609 | IP6_INC_STATS(IPSTATS_MIB_FRAGOKS); | |
610 | return 0; | |
611 | } | |
612 | ||
613 | while (frag) { | |
614 | skb = frag->next; | |
615 | kfree_skb(frag); | |
616 | frag = skb; | |
617 | } | |
618 | ||
619 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
620 | return err; | |
621 | } | |
622 | ||
623 | slow_path: | |
624 | left = skb->len - hlen; /* Space per frame */ | |
625 | ptr = hlen; /* Where to start from */ | |
626 | ||
627 | /* | |
628 | * Fragment the datagram. | |
629 | */ | |
630 | ||
631 | *prevhdr = NEXTHDR_FRAGMENT; | |
632 | ||
633 | /* | |
634 | * Keep copying data until we run out. | |
635 | */ | |
636 | while(left > 0) { | |
637 | len = left; | |
638 | /* IF: it doesn't fit, use 'mtu' - the data space left */ | |
639 | if (len > mtu) | |
640 | len = mtu; | |
641 | /* IF: we are not sending upto and including the packet end | |
642 | then align the next start on an eight byte boundary */ | |
643 | if (len < left) { | |
644 | len &= ~7; | |
645 | } | |
646 | /* | |
647 | * Allocate buffer. | |
648 | */ | |
649 | ||
650 | if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_RESERVED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) { | |
64ce2073 | 651 | NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); |
1da177e4 LT |
652 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); |
653 | err = -ENOMEM; | |
654 | goto fail; | |
655 | } | |
656 | ||
657 | /* | |
658 | * Set up data on packet | |
659 | */ | |
660 | ||
661 | ip6_copy_metadata(frag, skb); | |
662 | skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); | |
663 | skb_put(frag, len + hlen + sizeof(struct frag_hdr)); | |
664 | frag->nh.raw = frag->data; | |
665 | fh = (struct frag_hdr*)(frag->data + hlen); | |
666 | frag->h.raw = frag->data + hlen + sizeof(struct frag_hdr); | |
667 | ||
668 | /* | |
669 | * Charge the memory for the fragment to any owner | |
670 | * it might possess | |
671 | */ | |
672 | if (skb->sk) | |
673 | skb_set_owner_w(frag, skb->sk); | |
674 | ||
675 | /* | |
676 | * Copy the packet header into the new buffer. | |
677 | */ | |
678 | memcpy(frag->nh.raw, skb->data, hlen); | |
679 | ||
680 | /* | |
681 | * Build fragment header. | |
682 | */ | |
683 | fh->nexthdr = nexthdr; | |
684 | fh->reserved = 0; | |
f36d6ab1 | 685 | if (!frag_id) { |
1da177e4 LT |
686 | ipv6_select_ident(skb, fh); |
687 | frag_id = fh->identification; | |
688 | } else | |
689 | fh->identification = frag_id; | |
690 | ||
691 | /* | |
692 | * Copy a block of the IP datagram. | |
693 | */ | |
694 | if (skb_copy_bits(skb, ptr, frag->h.raw, len)) | |
695 | BUG(); | |
696 | left -= len; | |
697 | ||
698 | fh->frag_off = htons(offset); | |
699 | if (left > 0) | |
700 | fh->frag_off |= htons(IP6_MF); | |
701 | frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); | |
702 | ||
703 | ptr += len; | |
704 | offset += len; | |
705 | ||
706 | /* | |
707 | * Put this fragment into the sending queue. | |
708 | */ | |
709 | ||
710 | IP6_INC_STATS(IPSTATS_MIB_FRAGCREATES); | |
711 | ||
712 | err = output(frag); | |
713 | if (err) | |
714 | goto fail; | |
715 | } | |
716 | kfree_skb(skb); | |
717 | IP6_INC_STATS(IPSTATS_MIB_FRAGOKS); | |
718 | return err; | |
719 | ||
720 | fail: | |
721 | kfree_skb(skb); | |
722 | IP6_INC_STATS(IPSTATS_MIB_FRAGFAILS); | |
723 | return err; | |
724 | } | |
725 | ||
726 | int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) | |
727 | { | |
728 | int err = 0; | |
729 | ||
730 | *dst = NULL; | |
731 | if (sk) { | |
732 | struct ipv6_pinfo *np = inet6_sk(sk); | |
733 | ||
734 | *dst = sk_dst_check(sk, np->dst_cookie); | |
735 | if (*dst) { | |
736 | struct rt6_info *rt = (struct rt6_info*)*dst; | |
737 | ||
d76e60a5 DM |
738 | /* Yes, checking route validity in not connected |
739 | * case is not very simple. Take into account, | |
740 | * that we do not support routing by source, TOS, | |
741 | * and MSG_DONTROUTE --ANK (980726) | |
742 | * | |
743 | * 1. If route was host route, check that | |
744 | * cached destination is current. | |
745 | * If it is network route, we still may | |
746 | * check its validity using saved pointer | |
747 | * to the last used address: daddr_cache. | |
748 | * We do not want to save whole address now, | |
749 | * (because main consumer of this service | |
750 | * is tcp, which has not this problem), | |
751 | * so that the last trick works only on connected | |
752 | * sockets. | |
753 | * 2. oif also should be the same. | |
754 | */ | |
1da177e4 | 755 | if (((rt->rt6i_dst.plen != 128 || |
d76e60a5 DM |
756 | !ipv6_addr_equal(&fl->fl6_dst, |
757 | &rt->rt6i_dst.addr)) | |
1da177e4 | 758 | && (np->daddr_cache == NULL || |
d76e60a5 DM |
759 | !ipv6_addr_equal(&fl->fl6_dst, |
760 | np->daddr_cache))) | |
1da177e4 LT |
761 | || (fl->oif && fl->oif != (*dst)->dev->ifindex)) { |
762 | dst_release(*dst); | |
763 | *dst = NULL; | |
764 | } | |
765 | } | |
766 | } | |
767 | ||
768 | if (*dst == NULL) | |
769 | *dst = ip6_route_output(sk, fl); | |
770 | ||
771 | if ((err = (*dst)->error)) | |
772 | goto out_err_release; | |
773 | ||
774 | if (ipv6_addr_any(&fl->fl6_src)) { | |
775 | err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src); | |
776 | ||
44456d37 | 777 | if (err) |
1da177e4 | 778 | goto out_err_release; |
1da177e4 LT |
779 | } |
780 | ||
781 | return 0; | |
782 | ||
783 | out_err_release: | |
784 | dst_release(*dst); | |
785 | *dst = NULL; | |
786 | return err; | |
787 | } | |
34a0b3cd | 788 | |
3cf3dc6c ACM |
789 | EXPORT_SYMBOL_GPL(ip6_dst_lookup); |
790 | ||
34a0b3cd | 791 | static inline int ip6_ufo_append_data(struct sock *sk, |
e89e9cf5 AR |
792 | int getfrag(void *from, char *to, int offset, int len, |
793 | int odd, struct sk_buff *skb), | |
794 | void *from, int length, int hh_len, int fragheaderlen, | |
795 | int transhdrlen, int mtu,unsigned int flags) | |
796 | ||
797 | { | |
798 | struct sk_buff *skb; | |
799 | int err; | |
800 | ||
801 | /* There is support for UDP large send offload by network | |
802 | * device, so create one single skb packet containing complete | |
803 | * udp datagram | |
804 | */ | |
805 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { | |
806 | skb = sock_alloc_send_skb(sk, | |
807 | hh_len + fragheaderlen + transhdrlen + 20, | |
808 | (flags & MSG_DONTWAIT), &err); | |
809 | if (skb == NULL) | |
810 | return -ENOMEM; | |
811 | ||
812 | /* reserve space for Hardware header */ | |
813 | skb_reserve(skb, hh_len); | |
814 | ||
815 | /* create space for UDP/IP header */ | |
816 | skb_put(skb,fragheaderlen + transhdrlen); | |
817 | ||
818 | /* initialize network header pointer */ | |
819 | skb->nh.raw = skb->data; | |
820 | ||
821 | /* initialize protocol header pointer */ | |
822 | skb->h.raw = skb->data + fragheaderlen; | |
823 | ||
824 | skb->ip_summed = CHECKSUM_HW; | |
825 | skb->csum = 0; | |
826 | sk->sk_sndmsg_off = 0; | |
827 | } | |
828 | ||
829 | err = skb_append_datato_frags(sk,skb, getfrag, from, | |
830 | (length - transhdrlen)); | |
831 | if (!err) { | |
832 | struct frag_hdr fhdr; | |
833 | ||
834 | /* specify the length of each IP datagram fragment*/ | |
835 | skb_shinfo(skb)->ufo_size = (mtu - fragheaderlen) - | |
836 | sizeof(struct frag_hdr); | |
837 | ipv6_select_ident(skb, &fhdr); | |
838 | skb_shinfo(skb)->ip6_frag_id = fhdr.identification; | |
839 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
840 | ||
841 | return 0; | |
842 | } | |
843 | /* There is not enough support do UPD LSO, | |
844 | * so follow normal path | |
845 | */ | |
846 | kfree_skb(skb); | |
847 | ||
848 | return err; | |
849 | } | |
1da177e4 | 850 | |
41a1f8ea YH |
851 | int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, |
852 | int offset, int len, int odd, struct sk_buff *skb), | |
853 | void *from, int length, int transhdrlen, | |
854 | int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl, | |
855 | struct rt6_info *rt, unsigned int flags) | |
1da177e4 LT |
856 | { |
857 | struct inet_sock *inet = inet_sk(sk); | |
858 | struct ipv6_pinfo *np = inet6_sk(sk); | |
859 | struct sk_buff *skb; | |
860 | unsigned int maxfraglen, fragheaderlen; | |
861 | int exthdrlen; | |
862 | int hh_len; | |
863 | int mtu; | |
864 | int copy; | |
865 | int err; | |
866 | int offset = 0; | |
867 | int csummode = CHECKSUM_NONE; | |
868 | ||
869 | if (flags&MSG_PROBE) | |
870 | return 0; | |
871 | if (skb_queue_empty(&sk->sk_write_queue)) { | |
872 | /* | |
873 | * setup for corking | |
874 | */ | |
875 | if (opt) { | |
876 | if (np->cork.opt == NULL) { | |
877 | np->cork.opt = kmalloc(opt->tot_len, | |
878 | sk->sk_allocation); | |
879 | if (unlikely(np->cork.opt == NULL)) | |
880 | return -ENOBUFS; | |
881 | } else if (np->cork.opt->tot_len < opt->tot_len) { | |
882 | printk(KERN_DEBUG "ip6_append_data: invalid option length\n"); | |
883 | return -EINVAL; | |
884 | } | |
885 | memcpy(np->cork.opt, opt, opt->tot_len); | |
886 | inet->cork.flags |= IPCORK_OPT; | |
887 | /* need source address above miyazawa*/ | |
888 | } | |
889 | dst_hold(&rt->u.dst); | |
890 | np->cork.rt = rt; | |
891 | inet->cork.fl = *fl; | |
892 | np->cork.hop_limit = hlimit; | |
41a1f8ea | 893 | np->cork.tclass = tclass; |
d91675f9 | 894 | mtu = dst_mtu(rt->u.dst.path); |
c7503609 | 895 | if (np->frag_size < mtu) { |
d91675f9 YH |
896 | if (np->frag_size) |
897 | mtu = np->frag_size; | |
898 | } | |
899 | inet->cork.fragsize = mtu; | |
1da177e4 LT |
900 | if (dst_allfrag(rt->u.dst.path)) |
901 | inet->cork.flags |= IPCORK_ALLFRAG; | |
902 | inet->cork.length = 0; | |
903 | sk->sk_sndmsg_page = NULL; | |
904 | sk->sk_sndmsg_off = 0; | |
905 | exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0); | |
906 | length += exthdrlen; | |
907 | transhdrlen += exthdrlen; | |
908 | } else { | |
909 | rt = np->cork.rt; | |
910 | fl = &inet->cork.fl; | |
911 | if (inet->cork.flags & IPCORK_OPT) | |
912 | opt = np->cork.opt; | |
913 | transhdrlen = 0; | |
914 | exthdrlen = 0; | |
915 | mtu = inet->cork.fragsize; | |
916 | } | |
917 | ||
918 | hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); | |
919 | ||
920 | fragheaderlen = sizeof(struct ipv6hdr) + (opt ? opt->opt_nflen : 0); | |
921 | maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); | |
922 | ||
923 | if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { | |
924 | if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { | |
925 | ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); | |
926 | return -EMSGSIZE; | |
927 | } | |
928 | } | |
929 | ||
930 | /* | |
931 | * Let's try using as much space as possible. | |
932 | * Use MTU if total length of the message fits into the MTU. | |
933 | * Otherwise, we need to reserve fragment header and | |
934 | * fragment alignment (= 8-15 octects, in total). | |
935 | * | |
936 | * Note that we may need to "move" the data from the tail of | |
937 | * of the buffer to the new fragment when we split | |
938 | * the message. | |
939 | * | |
940 | * FIXME: It may be fragmented into multiple chunks | |
941 | * at once if non-fragmentable extension headers | |
942 | * are too large. | |
943 | * --yoshfuji | |
944 | */ | |
945 | ||
946 | inet->cork.length += length; | |
e89e9cf5 AR |
947 | if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) && |
948 | (rt->u.dst.dev->features & NETIF_F_UFO)) { | |
949 | ||
baa829d8 PM |
950 | err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len, |
951 | fragheaderlen, transhdrlen, mtu, | |
952 | flags); | |
953 | if (err) | |
e89e9cf5 | 954 | goto error; |
e89e9cf5 AR |
955 | return 0; |
956 | } | |
1da177e4 LT |
957 | |
958 | if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) | |
959 | goto alloc_new_skb; | |
960 | ||
961 | while (length > 0) { | |
962 | /* Check if the remaining data fits into current packet. */ | |
963 | copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; | |
964 | if (copy < length) | |
965 | copy = maxfraglen - skb->len; | |
966 | ||
967 | if (copy <= 0) { | |
968 | char *data; | |
969 | unsigned int datalen; | |
970 | unsigned int fraglen; | |
971 | unsigned int fraggap; | |
972 | unsigned int alloclen; | |
973 | struct sk_buff *skb_prev; | |
974 | alloc_new_skb: | |
975 | skb_prev = skb; | |
976 | ||
977 | /* There's no room in the current skb */ | |
978 | if (skb_prev) | |
979 | fraggap = skb_prev->len - maxfraglen; | |
980 | else | |
981 | fraggap = 0; | |
982 | ||
983 | /* | |
984 | * If remaining data exceeds the mtu, | |
985 | * we know we need more fragment(s). | |
986 | */ | |
987 | datalen = length + fraggap; | |
988 | if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) | |
989 | datalen = maxfraglen - fragheaderlen; | |
990 | ||
991 | fraglen = datalen + fragheaderlen; | |
992 | if ((flags & MSG_MORE) && | |
993 | !(rt->u.dst.dev->features&NETIF_F_SG)) | |
994 | alloclen = mtu; | |
995 | else | |
996 | alloclen = datalen + fragheaderlen; | |
997 | ||
998 | /* | |
999 | * The last fragment gets additional space at tail. | |
1000 | * Note: we overallocate on fragments with MSG_MODE | |
1001 | * because we have no idea if we're the last one. | |
1002 | */ | |
1003 | if (datalen == length + fraggap) | |
1004 | alloclen += rt->u.dst.trailer_len; | |
1005 | ||
1006 | /* | |
1007 | * We just reserve space for fragment header. | |
1008 | * Note: this may be overallocation if the message | |
1009 | * (without MSG_MORE) fits into the MTU. | |
1010 | */ | |
1011 | alloclen += sizeof(struct frag_hdr); | |
1012 | ||
1013 | if (transhdrlen) { | |
1014 | skb = sock_alloc_send_skb(sk, | |
1015 | alloclen + hh_len, | |
1016 | (flags & MSG_DONTWAIT), &err); | |
1017 | } else { | |
1018 | skb = NULL; | |
1019 | if (atomic_read(&sk->sk_wmem_alloc) <= | |
1020 | 2 * sk->sk_sndbuf) | |
1021 | skb = sock_wmalloc(sk, | |
1022 | alloclen + hh_len, 1, | |
1023 | sk->sk_allocation); | |
1024 | if (unlikely(skb == NULL)) | |
1025 | err = -ENOBUFS; | |
1026 | } | |
1027 | if (skb == NULL) | |
1028 | goto error; | |
1029 | /* | |
1030 | * Fill in the control structures | |
1031 | */ | |
1032 | skb->ip_summed = csummode; | |
1033 | skb->csum = 0; | |
1034 | /* reserve for fragmentation */ | |
1035 | skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); | |
1036 | ||
1037 | /* | |
1038 | * Find where to start putting bytes | |
1039 | */ | |
1040 | data = skb_put(skb, fraglen); | |
1041 | skb->nh.raw = data + exthdrlen; | |
1042 | data += fragheaderlen; | |
1043 | skb->h.raw = data + exthdrlen; | |
1044 | ||
1045 | if (fraggap) { | |
1046 | skb->csum = skb_copy_and_csum_bits( | |
1047 | skb_prev, maxfraglen, | |
1048 | data + transhdrlen, fraggap, 0); | |
1049 | skb_prev->csum = csum_sub(skb_prev->csum, | |
1050 | skb->csum); | |
1051 | data += fraggap; | |
1052 | skb_trim(skb_prev, maxfraglen); | |
1053 | } | |
1054 | copy = datalen - transhdrlen - fraggap; | |
1055 | if (copy < 0) { | |
1056 | err = -EINVAL; | |
1057 | kfree_skb(skb); | |
1058 | goto error; | |
1059 | } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { | |
1060 | err = -EFAULT; | |
1061 | kfree_skb(skb); | |
1062 | goto error; | |
1063 | } | |
1064 | ||
1065 | offset += copy; | |
1066 | length -= datalen - fraggap; | |
1067 | transhdrlen = 0; | |
1068 | exthdrlen = 0; | |
1069 | csummode = CHECKSUM_NONE; | |
1070 | ||
1071 | /* | |
1072 | * Put the packet on the pending queue | |
1073 | */ | |
1074 | __skb_queue_tail(&sk->sk_write_queue, skb); | |
1075 | continue; | |
1076 | } | |
1077 | ||
1078 | if (copy > length) | |
1079 | copy = length; | |
1080 | ||
1081 | if (!(rt->u.dst.dev->features&NETIF_F_SG)) { | |
1082 | unsigned int off; | |
1083 | ||
1084 | off = skb->len; | |
1085 | if (getfrag(from, skb_put(skb, copy), | |
1086 | offset, copy, off, skb) < 0) { | |
1087 | __skb_trim(skb, off); | |
1088 | err = -EFAULT; | |
1089 | goto error; | |
1090 | } | |
1091 | } else { | |
1092 | int i = skb_shinfo(skb)->nr_frags; | |
1093 | skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; | |
1094 | struct page *page = sk->sk_sndmsg_page; | |
1095 | int off = sk->sk_sndmsg_off; | |
1096 | unsigned int left; | |
1097 | ||
1098 | if (page && (left = PAGE_SIZE - off) > 0) { | |
1099 | if (copy >= left) | |
1100 | copy = left; | |
1101 | if (page != frag->page) { | |
1102 | if (i == MAX_SKB_FRAGS) { | |
1103 | err = -EMSGSIZE; | |
1104 | goto error; | |
1105 | } | |
1106 | get_page(page); | |
1107 | skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); | |
1108 | frag = &skb_shinfo(skb)->frags[i]; | |
1109 | } | |
1110 | } else if(i < MAX_SKB_FRAGS) { | |
1111 | if (copy > PAGE_SIZE) | |
1112 | copy = PAGE_SIZE; | |
1113 | page = alloc_pages(sk->sk_allocation, 0); | |
1114 | if (page == NULL) { | |
1115 | err = -ENOMEM; | |
1116 | goto error; | |
1117 | } | |
1118 | sk->sk_sndmsg_page = page; | |
1119 | sk->sk_sndmsg_off = 0; | |
1120 | ||
1121 | skb_fill_page_desc(skb, i, page, 0, 0); | |
1122 | frag = &skb_shinfo(skb)->frags[i]; | |
1123 | skb->truesize += PAGE_SIZE; | |
1124 | atomic_add(PAGE_SIZE, &sk->sk_wmem_alloc); | |
1125 | } else { | |
1126 | err = -EMSGSIZE; | |
1127 | goto error; | |
1128 | } | |
1129 | if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { | |
1130 | err = -EFAULT; | |
1131 | goto error; | |
1132 | } | |
1133 | sk->sk_sndmsg_off += copy; | |
1134 | frag->size += copy; | |
1135 | skb->len += copy; | |
1136 | skb->data_len += copy; | |
1137 | } | |
1138 | offset += copy; | |
1139 | length -= copy; | |
1140 | } | |
1141 | return 0; | |
1142 | error: | |
1143 | inet->cork.length -= length; | |
1144 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
1145 | return err; | |
1146 | } | |
1147 | ||
1148 | int ip6_push_pending_frames(struct sock *sk) | |
1149 | { | |
1150 | struct sk_buff *skb, *tmp_skb; | |
1151 | struct sk_buff **tail_skb; | |
1152 | struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; | |
1153 | struct inet_sock *inet = inet_sk(sk); | |
1154 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1155 | struct ipv6hdr *hdr; | |
1156 | struct ipv6_txoptions *opt = np->cork.opt; | |
1157 | struct rt6_info *rt = np->cork.rt; | |
1158 | struct flowi *fl = &inet->cork.fl; | |
1159 | unsigned char proto = fl->proto; | |
1160 | int err = 0; | |
1161 | ||
1162 | if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) | |
1163 | goto out; | |
1164 | tail_skb = &(skb_shinfo(skb)->frag_list); | |
1165 | ||
1166 | /* move skb->data to ip header from ext header */ | |
1167 | if (skb->data < skb->nh.raw) | |
1168 | __skb_pull(skb, skb->nh.raw - skb->data); | |
1169 | while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { | |
1170 | __skb_pull(tmp_skb, skb->h.raw - skb->nh.raw); | |
1171 | *tail_skb = tmp_skb; | |
1172 | tail_skb = &(tmp_skb->next); | |
1173 | skb->len += tmp_skb->len; | |
1174 | skb->data_len += tmp_skb->len; | |
1da177e4 LT |
1175 | skb->truesize += tmp_skb->truesize; |
1176 | __sock_put(tmp_skb->sk); | |
1177 | tmp_skb->destructor = NULL; | |
1178 | tmp_skb->sk = NULL; | |
1da177e4 LT |
1179 | } |
1180 | ||
1181 | ipv6_addr_copy(final_dst, &fl->fl6_dst); | |
1182 | __skb_pull(skb, skb->h.raw - skb->nh.raw); | |
1183 | if (opt && opt->opt_flen) | |
1184 | ipv6_push_frag_opts(skb, opt, &proto); | |
1185 | if (opt && opt->opt_nflen) | |
1186 | ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); | |
1187 | ||
1188 | skb->nh.ipv6h = hdr = (struct ipv6hdr*) skb_push(skb, sizeof(struct ipv6hdr)); | |
1189 | ||
41a1f8ea YH |
1190 | *(u32*)hdr = fl->fl6_flowlabel | |
1191 | htonl(0x60000000 | ((int)np->cork.tclass << 20)); | |
1da177e4 LT |
1192 | |
1193 | if (skb->len <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) | |
1194 | hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); | |
1195 | else | |
1196 | hdr->payload_len = 0; | |
1197 | hdr->hop_limit = np->cork.hop_limit; | |
1198 | hdr->nexthdr = proto; | |
1199 | ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); | |
1200 | ipv6_addr_copy(&hdr->daddr, final_dst); | |
1201 | ||
a2c2064f PM |
1202 | skb->priority = sk->sk_priority; |
1203 | ||
1da177e4 LT |
1204 | skb->dst = dst_clone(&rt->u.dst); |
1205 | IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); | |
1206 | err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dst->dev, dst_output); | |
1207 | if (err) { | |
1208 | if (err > 0) | |
3320da89 | 1209 | err = np->recverr ? net_xmit_errno(err) : 0; |
1da177e4 LT |
1210 | if (err) |
1211 | goto error; | |
1212 | } | |
1213 | ||
1214 | out: | |
1215 | inet->cork.flags &= ~IPCORK_OPT; | |
a51482bd JJ |
1216 | kfree(np->cork.opt); |
1217 | np->cork.opt = NULL; | |
1da177e4 LT |
1218 | if (np->cork.rt) { |
1219 | dst_release(&np->cork.rt->u.dst); | |
1220 | np->cork.rt = NULL; | |
1221 | inet->cork.flags &= ~IPCORK_ALLFRAG; | |
1222 | } | |
1223 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1224 | return err; | |
1225 | error: | |
1226 | goto out; | |
1227 | } | |
1228 | ||
1229 | void ip6_flush_pending_frames(struct sock *sk) | |
1230 | { | |
1231 | struct inet_sock *inet = inet_sk(sk); | |
1232 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1233 | struct sk_buff *skb; | |
1234 | ||
1235 | while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { | |
1236 | IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); | |
1237 | kfree_skb(skb); | |
1238 | } | |
1239 | ||
1240 | inet->cork.flags &= ~IPCORK_OPT; | |
1241 | ||
a51482bd JJ |
1242 | kfree(np->cork.opt); |
1243 | np->cork.opt = NULL; | |
1da177e4 LT |
1244 | if (np->cork.rt) { |
1245 | dst_release(&np->cork.rt->u.dst); | |
1246 | np->cork.rt = NULL; | |
1247 | inet->cork.flags &= ~IPCORK_ALLFRAG; | |
1248 | } | |
1249 | memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); | |
1250 | } |