1 /* 2 * IPv6 output functions 3 * Linux INET6 implementation 4 * 5 * Authors: 6 * Pedro Roque <roque@di.fc.ul.pt> 7 * 8 * $Id: ip6_output.c,v 1.34 2002/02/01 22:01:04 davem Exp $ 9 * 10 * Based on linux/net/ipv4/ip_output.c 11 * 12 * This program is free software; you can redistribute it and/or 13 * modify it under the terms of the GNU General Public License 14 * as published by the Free Software Foundation; either version 15 * 2 of the License, or (at your option) any later version. 16 * 17 * Changes: 18 * A.N.Kuznetsov : airthmetics in fragmentation. 19 * extension headers are implemented. 20 * route changes now work. 21 * ip6_forward does not confuse sniffers. 22 * etc. 23 * 24 * H. von Brand : Added missing #include <linux/string.h> 25 * Imran Patel : frag id should be in NBO 26 * Kazunori MIYAZAWA @USAGI 27 * : add ip6_append_data and related functions 28 * for datagram xmit 29 */ 30 31 #include <linux/errno.h> 32 #include <linux/types.h> 33 #include <linux/string.h> 34 #include <linux/socket.h> 35 #include <linux/net.h> 36 #include <linux/netdevice.h> 37 #include <linux/if_arp.h> 38 #include <linux/in6.h> 39 #include <linux/tcp.h> 40 #include <linux/route.h> 41 #include <linux/module.h> 42 43 #include <linux/netfilter.h> 44 #include <linux/netfilter_ipv6.h> 45 46 #include <net/sock.h> 47 #include <net/snmp.h> 48 49 #include <net/ipv6.h> 50 #include <net/ndisc.h> 51 #include <net/protocol.h> 52 #include <net/ip6_route.h> 53 #include <net/addrconf.h> 54 #include <net/rawv6.h> 55 #include <net/icmp.h> 56 #include <net/xfrm.h> 57 #include <net/checksum.h> 58 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 struct dst_entry *dst = skb->dst; 76 77 if (dst->hh) 78 return neigh_hh_output(dst->hh, skb); 79 else if (dst->neighbour) 80 return dst->neighbour->output(skb); 81 82 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); 83 kfree_skb(skb); 84 return -EINVAL; 85 86 } 87 88 /* dev_loopback_xmit for use with netfilter. */ 89 static int ip6_dev_loopback_xmit(struct sk_buff *newskb) 90 { 91 newskb->mac.raw = newskb->data; 92 __skb_pull(newskb, newskb->nh.raw - newskb->data); 93 newskb->pkt_type = PACKET_LOOPBACK; 94 newskb->ip_summed = CHECKSUM_UNNECESSARY; 95 BUG_TRAP(newskb->dst); 96 97 netif_rx(newskb); 98 return 0; 99 } 100 101 102 static int ip6_output2(struct sk_buff *skb) 103 { 104 struct dst_entry *dst = skb->dst; 105 struct net_device *dev = dst->dev; 106 107 skb->protocol = htons(ETH_P_IPV6); 108 skb->dev = dev; 109 110 if (ipv6_addr_is_multicast(&skb->nh.ipv6h->daddr)) { 111 struct ipv6_pinfo* np = skb->sk ? inet6_sk(skb->sk) : NULL; 112 struct inet6_dev *idev = ip6_dst_idev(skb->dst); 113 114 if (!(dev->flags & IFF_LOOPBACK) && (!np || np->mc_loop) && 115 ipv6_chk_mcast_addr(dev, &skb->nh.ipv6h->daddr, 116 &skb->nh.ipv6h->saddr)) { 117 struct sk_buff *newskb = skb_clone(skb, GFP_ATOMIC); 118 119 /* Do not check for IFF_ALLMULTI; multicast routing 120 is not supported in any case. 121 */ 122 if (newskb) 123 NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, newskb, NULL, 124 newskb->dev, 125 ip6_dev_loopback_xmit); 126 127 if (skb->nh.ipv6h->hop_limit == 0) { 128 IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); 129 kfree_skb(skb); 130 return 0; 131 } 132 } 133 134 IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); 135 } 136 137 return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb,NULL, skb->dev,ip6_output_finish); 138 } 139 140 int ip6_output(struct sk_buff *skb) 141 { 142 if ((skb->len > dst_mtu(skb->dst) && !skb_is_gso(skb)) || 143 dst_allfrag(skb->dst)) 144 return ip6_fragment(skb, ip6_output2); 145 else 146 return ip6_output2(skb); 147 } 148 149 /* 150 * xmit an sk_buff (used by TCP) 151 */ 152 153 int ip6_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl, 154 struct ipv6_txoptions *opt, int ipfragok) 155 { 156 struct ipv6_pinfo *np = inet6_sk(sk); 157 struct in6_addr *first_hop = &fl->fl6_dst; 158 struct dst_entry *dst = skb->dst; 159 struct ipv6hdr *hdr; 160 u8 proto = fl->proto; 161 int seg_len = skb->len; 162 int hlimit, tclass; 163 u32 mtu; 164 165 if (opt) { 166 int head_room; 167 168 /* First: exthdrs may take lots of space (~8K for now) 169 MAX_HEADER is not enough. 170 */ 171 head_room = opt->opt_nflen + opt->opt_flen; 172 seg_len += head_room; 173 head_room += sizeof(struct ipv6hdr) + LL_RESERVED_SPACE(dst->dev); 174 175 if (skb_headroom(skb) < head_room) { 176 struct sk_buff *skb2 = skb_realloc_headroom(skb, head_room); 177 if (skb2 == NULL) { 178 IP6_INC_STATS(ip6_dst_idev(skb->dst), 179 IPSTATS_MIB_OUTDISCARDS); 180 kfree_skb(skb); 181 return -ENOBUFS; 182 } 183 kfree_skb(skb); 184 skb = skb2; 185 if (sk) 186 skb_set_owner_w(skb, sk); 187 } 188 if (opt->opt_flen) 189 ipv6_push_frag_opts(skb, opt, &proto); 190 if (opt->opt_nflen) 191 ipv6_push_nfrag_opts(skb, opt, &proto, &first_hop); 192 } 193 194 hdr = skb->nh.ipv6h = (struct ipv6hdr*)skb_push(skb, sizeof(struct ipv6hdr)); 195 196 /* 197 * Fill in the IPv6 header 198 */ 199 200 hlimit = -1; 201 if (np) 202 hlimit = np->hop_limit; 203 if (hlimit < 0) 204 hlimit = dst_metric(dst, RTAX_HOPLIMIT); 205 if (hlimit < 0) 206 hlimit = ipv6_get_hoplimit(dst->dev); 207 208 tclass = -1; 209 if (np) 210 tclass = np->tclass; 211 if (tclass < 0) 212 tclass = 0; 213 214 *(__be32 *)hdr = htonl(0x60000000 | (tclass << 20)) | fl->fl6_flowlabel; 215 216 hdr->payload_len = htons(seg_len); 217 hdr->nexthdr = proto; 218 hdr->hop_limit = hlimit; 219 220 ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); 221 ipv6_addr_copy(&hdr->daddr, first_hop); 222 223 skb->priority = sk->sk_priority; 224 225 mtu = dst_mtu(dst); 226 if ((skb->len <= mtu) || ipfragok || skb_is_gso(skb)) { 227 IP6_INC_STATS(ip6_dst_idev(skb->dst), 228 IPSTATS_MIB_OUTREQUESTS); 229 return NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, 230 dst_output); 231 } 232 233 if (net_ratelimit()) 234 printk(KERN_DEBUG "IPv6: sending pkt_too_big to self\n"); 235 skb->dev = dst->dev; 236 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); 237 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS); 238 kfree_skb(skb); 239 return -EMSGSIZE; 240 } 241 242 EXPORT_SYMBOL(ip6_xmit); 243 244 /* 245 * To avoid extra problems ND packets are send through this 246 * routine. It's code duplication but I really want to avoid 247 * extra checks since ipv6_build_header is used by TCP (which 248 * is for us performance critical) 249 */ 250 251 int ip6_nd_hdr(struct sock *sk, struct sk_buff *skb, struct net_device *dev, 252 struct in6_addr *saddr, struct in6_addr *daddr, 253 int proto, int len) 254 { 255 struct ipv6_pinfo *np = inet6_sk(sk); 256 struct ipv6hdr *hdr; 257 int totlen; 258 259 skb->protocol = htons(ETH_P_IPV6); 260 skb->dev = dev; 261 262 totlen = len + sizeof(struct ipv6hdr); 263 264 hdr = (struct ipv6hdr *) skb_put(skb, sizeof(struct ipv6hdr)); 265 skb->nh.ipv6h = hdr; 266 267 *(__be32*)hdr = htonl(0x60000000); 268 269 hdr->payload_len = htons(len); 270 hdr->nexthdr = proto; 271 hdr->hop_limit = np->hop_limit; 272 273 ipv6_addr_copy(&hdr->saddr, saddr); 274 ipv6_addr_copy(&hdr->daddr, daddr); 275 276 return 0; 277 } 278 279 static int ip6_call_ra_chain(struct sk_buff *skb, int sel) 280 { 281 struct ip6_ra_chain *ra; 282 struct sock *last = NULL; 283 284 read_lock(&ip6_ra_lock); 285 for (ra = ip6_ra_chain; ra; ra = ra->next) { 286 struct sock *sk = ra->sk; 287 if (sk && ra->sel == sel && 288 (!sk->sk_bound_dev_if || 289 sk->sk_bound_dev_if == skb->dev->ifindex)) { 290 if (last) { 291 struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); 292 if (skb2) 293 rawv6_rcv(last, skb2); 294 } 295 last = sk; 296 } 297 } 298 299 if (last) { 300 rawv6_rcv(last, skb); 301 read_unlock(&ip6_ra_lock); 302 return 1; 303 } 304 read_unlock(&ip6_ra_lock); 305 return 0; 306 } 307 308 static int ip6_forward_proxy_check(struct sk_buff *skb) 309 { 310 struct ipv6hdr *hdr = skb->nh.ipv6h; 311 u8 nexthdr = hdr->nexthdr; 312 int offset; 313 314 if (ipv6_ext_hdr(nexthdr)) { 315 offset = ipv6_skip_exthdr(skb, sizeof(*hdr), &nexthdr); 316 if (offset < 0) 317 return 0; 318 } else 319 offset = sizeof(struct ipv6hdr); 320 321 if (nexthdr == IPPROTO_ICMPV6) { 322 struct icmp6hdr *icmp6; 323 324 if (!pskb_may_pull(skb, skb->nh.raw + offset + 1 - skb->data)) 325 return 0; 326 327 icmp6 = (struct icmp6hdr *)(skb->nh.raw + offset); 328 329 switch (icmp6->icmp6_type) { 330 case NDISC_ROUTER_SOLICITATION: 331 case NDISC_ROUTER_ADVERTISEMENT: 332 case NDISC_NEIGHBOUR_SOLICITATION: 333 case NDISC_NEIGHBOUR_ADVERTISEMENT: 334 case NDISC_REDIRECT: 335 /* For reaction involving unicast neighbor discovery 336 * message destined to the proxied address, pass it to 337 * input function. 338 */ 339 return 1; 340 default: 341 break; 342 } 343 } 344 345 /* 346 * The proxying router can't forward traffic sent to a link-local 347 * address, so signal the sender and discard the packet. This 348 * behavior is clarified by the MIPv6 specification. 349 */ 350 if (ipv6_addr_type(&hdr->daddr) & IPV6_ADDR_LINKLOCAL) { 351 dst_link_failure(skb); 352 return -1; 353 } 354 355 return 0; 356 } 357 358 static inline int ip6_forward_finish(struct sk_buff *skb) 359 { 360 return dst_output(skb); 361 } 362 363 int ip6_forward(struct sk_buff *skb) 364 { 365 struct dst_entry *dst = skb->dst; 366 struct ipv6hdr *hdr = skb->nh.ipv6h; 367 struct inet6_skb_parm *opt = IP6CB(skb); 368 369 if (ipv6_devconf.forwarding == 0) 370 goto error; 371 372 if (!xfrm6_policy_check(NULL, XFRM_POLICY_FWD, skb)) { 373 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); 374 goto drop; 375 } 376 377 skb->ip_summed = CHECKSUM_NONE; 378 379 /* 380 * We DO NOT make any processing on 381 * RA packets, pushing them to user level AS IS 382 * without ane WARRANTY that application will be able 383 * to interpret them. The reason is that we 384 * cannot make anything clever here. 385 * 386 * We are not end-node, so that if packet contains 387 * AH/ESP, we cannot make anything. 388 * Defragmentation also would be mistake, RA packets 389 * cannot be fragmented, because there is no warranty 390 * that different fragments will go along one path. --ANK 391 */ 392 if (opt->ra) { 393 u8 *ptr = skb->nh.raw + opt->ra; 394 if (ip6_call_ra_chain(skb, (ptr[2]<<8) + ptr[3])) 395 return 0; 396 } 397 398 /* 399 * check and decrement ttl 400 */ 401 if (hdr->hop_limit <= 1) { 402 /* Force OUTPUT device used as source address */ 403 skb->dev = dst->dev; 404 icmpv6_send(skb, ICMPV6_TIME_EXCEED, ICMPV6_EXC_HOPLIMIT, 405 0, skb->dev); 406 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INHDRERRORS); 407 408 kfree_skb(skb); 409 return -ETIMEDOUT; 410 } 411 412 /* XXX: idev->cnf.proxy_ndp? */ 413 if (ipv6_devconf.proxy_ndp && 414 pneigh_lookup(&nd_tbl, &hdr->daddr, skb->dev, 0)) { 415 int proxied = ip6_forward_proxy_check(skb); 416 if (proxied > 0) 417 return ip6_input(skb); 418 else if (proxied < 0) { 419 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); 420 goto drop; 421 } 422 } 423 424 if (!xfrm6_route_forward(skb)) { 425 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_INDISCARDS); 426 goto drop; 427 } 428 dst = skb->dst; 429 430 /* IPv6 specs say nothing about it, but it is clear that we cannot 431 send redirects to source routed frames. 432 */ 433 if (skb->dev == dst->dev && dst->neighbour && opt->srcrt == 0) { 434 struct in6_addr *target = NULL; 435 struct rt6_info *rt; 436 struct neighbour *n = dst->neighbour; 437 438 /* 439 * incoming and outgoing devices are the same 440 * send a redirect. 441 */ 442 443 rt = (struct rt6_info *) dst; 444 if ((rt->rt6i_flags & RTF_GATEWAY)) 445 target = (struct in6_addr*)&n->primary_key; 446 else 447 target = &hdr->daddr; 448 449 /* Limit redirects both by destination (here) 450 and by source (inside ndisc_send_redirect) 451 */ 452 if (xrlim_allow(dst, 1*HZ)) 453 ndisc_send_redirect(skb, n, target); 454 } else if (ipv6_addr_type(&hdr->saddr)&(IPV6_ADDR_MULTICAST|IPV6_ADDR_LOOPBACK 455 |IPV6_ADDR_LINKLOCAL)) { 456 /* This check is security critical. */ 457 goto error; 458 } 459 460 if (skb->len > dst_mtu(dst)) { 461 /* Again, force OUTPUT device used as source address */ 462 skb->dev = dst->dev; 463 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, dst_mtu(dst), skb->dev); 464 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INTOOBIGERRORS); 465 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_FRAGFAILS); 466 kfree_skb(skb); 467 return -EMSGSIZE; 468 } 469 470 if (skb_cow(skb, dst->dev->hard_header_len)) { 471 IP6_INC_STATS(ip6_dst_idev(dst), IPSTATS_MIB_OUTDISCARDS); 472 goto drop; 473 } 474 475 hdr = skb->nh.ipv6h; 476 477 /* Mangling hops number delayed to point after skb COW */ 478 479 hdr->hop_limit--; 480 481 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_OUTFORWDATAGRAMS); 482 return NF_HOOK(PF_INET6,NF_IP6_FORWARD, skb, skb->dev, dst->dev, ip6_forward_finish); 483 484 error: 485 IP6_INC_STATS_BH(ip6_dst_idev(dst), IPSTATS_MIB_INADDRERRORS); 486 drop: 487 kfree_skb(skb); 488 return -EINVAL; 489 } 490 491 static void ip6_copy_metadata(struct sk_buff *to, struct sk_buff *from) 492 { 493 to->pkt_type = from->pkt_type; 494 to->priority = from->priority; 495 to->protocol = from->protocol; 496 dst_release(to->dst); 497 to->dst = dst_clone(from->dst); 498 to->dev = from->dev; 499 to->mark = from->mark; 500 501 #ifdef CONFIG_NET_SCHED 502 to->tc_index = from->tc_index; 503 #endif 504 #ifdef CONFIG_NETFILTER 505 /* Connection association is same as pre-frag packet */ 506 nf_conntrack_put(to->nfct); 507 to->nfct = from->nfct; 508 nf_conntrack_get(to->nfct); 509 to->nfctinfo = from->nfctinfo; 510 #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) 511 nf_conntrack_put_reasm(to->nfct_reasm); 512 to->nfct_reasm = from->nfct_reasm; 513 nf_conntrack_get_reasm(to->nfct_reasm); 514 #endif 515 #ifdef CONFIG_BRIDGE_NETFILTER 516 nf_bridge_put(to->nf_bridge); 517 to->nf_bridge = from->nf_bridge; 518 nf_bridge_get(to->nf_bridge); 519 #endif 520 #endif 521 skb_copy_secmark(to, from); 522 } 523 524 int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) 525 { 526 u16 offset = sizeof(struct ipv6hdr); 527 struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr*)(skb->nh.ipv6h + 1); 528 unsigned int packet_len = skb->tail - skb->nh.raw; 529 int found_rhdr = 0; 530 *nexthdr = &skb->nh.ipv6h->nexthdr; 531 532 while (offset + 1 <= packet_len) { 533 534 switch (**nexthdr) { 535 536 case NEXTHDR_HOP: 537 break; 538 case NEXTHDR_ROUTING: 539 found_rhdr = 1; 540 break; 541 case NEXTHDR_DEST: 542 #ifdef CONFIG_IPV6_MIP6 543 if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) 544 break; 545 #endif 546 if (found_rhdr) 547 return offset; 548 break; 549 default : 550 return offset; 551 } 552 553 offset += ipv6_optlen(exthdr); 554 *nexthdr = &exthdr->nexthdr; 555 exthdr = (struct ipv6_opt_hdr*)(skb->nh.raw + offset); 556 } 557 558 return offset; 559 } 560 EXPORT_SYMBOL_GPL(ip6_find_1stfragopt); 561 562 static int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *)) 563 { 564 struct net_device *dev; 565 struct sk_buff *frag; 566 struct rt6_info *rt = (struct rt6_info*)skb->dst; 567 struct ipv6_pinfo *np = skb->sk ? inet6_sk(skb->sk) : NULL; 568 struct ipv6hdr *tmp_hdr; 569 struct frag_hdr *fh; 570 unsigned int mtu, hlen, left, len; 571 __be32 frag_id = 0; 572 int ptr, offset = 0, err=0; 573 u8 *prevhdr, nexthdr = 0; 574 575 dev = rt->u.dst.dev; 576 hlen = ip6_find_1stfragopt(skb, &prevhdr); 577 nexthdr = *prevhdr; 578 579 mtu = dst_mtu(&rt->u.dst); 580 if (np && np->frag_size < mtu) { 581 if (np->frag_size) 582 mtu = np->frag_size; 583 } 584 mtu -= hlen + sizeof(struct frag_hdr); 585 586 if (skb_shinfo(skb)->frag_list) { 587 int first_len = skb_pagelen(skb); 588 589 if (first_len - hlen > mtu || 590 ((first_len - hlen) & 7) || 591 skb_cloned(skb)) 592 goto slow_path; 593 594 for (frag = skb_shinfo(skb)->frag_list; frag; frag = frag->next) { 595 /* Correct geometry. */ 596 if (frag->len > mtu || 597 ((frag->len & 7) && frag->next) || 598 skb_headroom(frag) < hlen) 599 goto slow_path; 600 601 /* Partially cloned skb? */ 602 if (skb_shared(frag)) 603 goto slow_path; 604 605 BUG_ON(frag->sk); 606 if (skb->sk) { 607 sock_hold(skb->sk); 608 frag->sk = skb->sk; 609 frag->destructor = sock_wfree; 610 skb->truesize -= frag->truesize; 611 } 612 } 613 614 err = 0; 615 offset = 0; 616 frag = skb_shinfo(skb)->frag_list; 617 skb_shinfo(skb)->frag_list = NULL; 618 /* BUILD HEADER */ 619 620 *prevhdr = NEXTHDR_FRAGMENT; 621 tmp_hdr = kmemdup(skb->nh.raw, hlen, GFP_ATOMIC); 622 if (!tmp_hdr) { 623 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGFAILS); 624 return -ENOMEM; 625 } 626 627 __skb_pull(skb, hlen); 628 fh = (struct frag_hdr*)__skb_push(skb, sizeof(struct frag_hdr)); 629 skb->nh.raw = __skb_push(skb, hlen); 630 memcpy(skb->nh.raw, tmp_hdr, hlen); 631 632 ipv6_select_ident(skb, fh); 633 fh->nexthdr = nexthdr; 634 fh->reserved = 0; 635 fh->frag_off = htons(IP6_MF); 636 frag_id = fh->identification; 637 638 first_len = skb_pagelen(skb); 639 skb->data_len = first_len - skb_headlen(skb); 640 skb->len = first_len; 641 skb->nh.ipv6h->payload_len = htons(first_len - sizeof(struct ipv6hdr)); 642 643 dst_hold(&rt->u.dst); 644 645 for (;;) { 646 /* Prepare header of the next frame, 647 * before previous one went down. */ 648 if (frag) { 649 frag->ip_summed = CHECKSUM_NONE; 650 frag->h.raw = frag->data; 651 fh = (struct frag_hdr*)__skb_push(frag, sizeof(struct frag_hdr)); 652 frag->nh.raw = __skb_push(frag, hlen); 653 memcpy(frag->nh.raw, tmp_hdr, hlen); 654 offset += skb->len - hlen - sizeof(struct frag_hdr); 655 fh->nexthdr = nexthdr; 656 fh->reserved = 0; 657 fh->frag_off = htons(offset); 658 if (frag->next != NULL) 659 fh->frag_off |= htons(IP6_MF); 660 fh->identification = frag_id; 661 frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); 662 ip6_copy_metadata(frag, skb); 663 } 664 665 err = output(skb); 666 if(!err) 667 IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGCREATES); 668 669 if (err || !frag) 670 break; 671 672 skb = frag; 673 frag = skb->next; 674 skb->next = NULL; 675 } 676 677 kfree(tmp_hdr); 678 679 if (err == 0) { 680 IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGOKS); 681 dst_release(&rt->u.dst); 682 return 0; 683 } 684 685 while (frag) { 686 skb = frag->next; 687 kfree_skb(frag); 688 frag = skb; 689 } 690 691 IP6_INC_STATS(ip6_dst_idev(&rt->u.dst), IPSTATS_MIB_FRAGFAILS); 692 dst_release(&rt->u.dst); 693 return err; 694 } 695 696 slow_path: 697 left = skb->len - hlen; /* Space per frame */ 698 ptr = hlen; /* Where to start from */ 699 700 /* 701 * Fragment the datagram. 702 */ 703 704 *prevhdr = NEXTHDR_FRAGMENT; 705 706 /* 707 * Keep copying data until we run out. 708 */ 709 while(left > 0) { 710 len = left; 711 /* IF: it doesn't fit, use 'mtu' - the data space left */ 712 if (len > mtu) 713 len = mtu; 714 /* IF: we are not sending upto and including the packet end 715 then align the next start on an eight byte boundary */ 716 if (len < left) { 717 len &= ~7; 718 } 719 /* 720 * Allocate buffer. 721 */ 722 723 if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_RESERVED_SPACE(rt->u.dst.dev), GFP_ATOMIC)) == NULL) { 724 NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n"); 725 IP6_INC_STATS(ip6_dst_idev(skb->dst), 726 IPSTATS_MIB_FRAGFAILS); 727 err = -ENOMEM; 728 goto fail; 729 } 730 731 /* 732 * Set up data on packet 733 */ 734 735 ip6_copy_metadata(frag, skb); 736 skb_reserve(frag, LL_RESERVED_SPACE(rt->u.dst.dev)); 737 skb_put(frag, len + hlen + sizeof(struct frag_hdr)); 738 frag->nh.raw = frag->data; 739 fh = (struct frag_hdr*)(frag->data + hlen); 740 frag->h.raw = frag->data + hlen + sizeof(struct frag_hdr); 741 742 /* 743 * Charge the memory for the fragment to any owner 744 * it might possess 745 */ 746 if (skb->sk) 747 skb_set_owner_w(frag, skb->sk); 748 749 /* 750 * Copy the packet header into the new buffer. 751 */ 752 memcpy(frag->nh.raw, skb->data, hlen); 753 754 /* 755 * Build fragment header. 756 */ 757 fh->nexthdr = nexthdr; 758 fh->reserved = 0; 759 if (!frag_id) { 760 ipv6_select_ident(skb, fh); 761 frag_id = fh->identification; 762 } else 763 fh->identification = frag_id; 764 765 /* 766 * Copy a block of the IP datagram. 767 */ 768 if (skb_copy_bits(skb, ptr, frag->h.raw, len)) 769 BUG(); 770 left -= len; 771 772 fh->frag_off = htons(offset); 773 if (left > 0) 774 fh->frag_off |= htons(IP6_MF); 775 frag->nh.ipv6h->payload_len = htons(frag->len - sizeof(struct ipv6hdr)); 776 777 ptr += len; 778 offset += len; 779 780 /* 781 * Put this fragment into the sending queue. 782 */ 783 err = output(frag); 784 if (err) 785 goto fail; 786 787 IP6_INC_STATS(ip6_dst_idev(skb->dst), IPSTATS_MIB_FRAGCREATES); 788 } 789 IP6_INC_STATS(ip6_dst_idev(skb->dst), 790 IPSTATS_MIB_FRAGOKS); 791 kfree_skb(skb); 792 return err; 793 794 fail: 795 IP6_INC_STATS(ip6_dst_idev(skb->dst), 796 IPSTATS_MIB_FRAGFAILS); 797 kfree_skb(skb); 798 return err; 799 } 800 801 static inline int ip6_rt_check(struct rt6key *rt_key, 802 struct in6_addr *fl_addr, 803 struct in6_addr *addr_cache) 804 { 805 return ((rt_key->plen != 128 || !ipv6_addr_equal(fl_addr, &rt_key->addr)) && 806 (addr_cache == NULL || !ipv6_addr_equal(fl_addr, addr_cache))); 807 } 808 809 static struct dst_entry *ip6_sk_dst_check(struct sock *sk, 810 struct dst_entry *dst, 811 struct flowi *fl) 812 { 813 struct ipv6_pinfo *np = inet6_sk(sk); 814 struct rt6_info *rt = (struct rt6_info *)dst; 815 816 if (!dst) 817 goto out; 818 819 /* Yes, checking route validity in not connected 820 * case is not very simple. Take into account, 821 * that we do not support routing by source, TOS, 822 * and MSG_DONTROUTE --ANK (980726) 823 * 824 * 1. ip6_rt_check(): If route was host route, 825 * check that cached destination is current. 826 * If it is network route, we still may 827 * check its validity using saved pointer 828 * to the last used address: daddr_cache. 829 * We do not want to save whole address now, 830 * (because main consumer of this service 831 * is tcp, which has not this problem), 832 * so that the last trick works only on connected 833 * sockets. 834 * 2. oif also should be the same. 835 */ 836 if (ip6_rt_check(&rt->rt6i_dst, &fl->fl6_dst, np->daddr_cache) || 837 #ifdef CONFIG_IPV6_SUBTREES 838 ip6_rt_check(&rt->rt6i_src, &fl->fl6_src, np->saddr_cache) || 839 #endif 840 (fl->oif && fl->oif != dst->dev->ifindex)) { 841 dst_release(dst); 842 dst = NULL; 843 } 844 845 out: 846 return dst; 847 } 848 849 static int ip6_dst_lookup_tail(struct sock *sk, 850 struct dst_entry **dst, struct flowi *fl) 851 { 852 int err; 853 854 if (*dst == NULL) 855 *dst = ip6_route_output(sk, fl); 856 857 if ((err = (*dst)->error)) 858 goto out_err_release; 859 860 if (ipv6_addr_any(&fl->fl6_src)) { 861 err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src); 862 if (err) 863 goto out_err_release; 864 } 865 866 return 0; 867 868 out_err_release: 869 dst_release(*dst); 870 *dst = NULL; 871 return err; 872 } 873 874 /** 875 * ip6_dst_lookup - perform route lookup on flow 876 * @sk: socket which provides route info 877 * @dst: pointer to dst_entry * for result 878 * @fl: flow to lookup 879 * 880 * This function performs a route lookup on the given flow. 881 * 882 * It returns zero on success, or a standard errno code on error. 883 */ 884 int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) 885 { 886 *dst = NULL; 887 return ip6_dst_lookup_tail(sk, dst, fl); 888 } 889 EXPORT_SYMBOL_GPL(ip6_dst_lookup); 890 891 /** 892 * ip6_sk_dst_lookup - perform socket cached route lookup on flow 893 * @sk: socket which provides the dst cache and route info 894 * @dst: pointer to dst_entry * for result 895 * @fl: flow to lookup 896 * 897 * This function performs a route lookup on the given flow with the 898 * possibility of using the cached route in the socket if it is valid. 899 * It will take the socket dst lock when operating on the dst cache. 900 * As a result, this function can only be used in process context. 901 * 902 * It returns zero on success, or a standard errno code on error. 903 */ 904 int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl) 905 { 906 *dst = NULL; 907 if (sk) { 908 *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie); 909 *dst = ip6_sk_dst_check(sk, *dst, fl); 910 } 911 912 return ip6_dst_lookup_tail(sk, dst, fl); 913 } 914 EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup); 915 916 static inline int ip6_ufo_append_data(struct sock *sk, 917 int getfrag(void *from, char *to, int offset, int len, 918 int odd, struct sk_buff *skb), 919 void *from, int length, int hh_len, int fragheaderlen, 920 int transhdrlen, int mtu,unsigned int flags) 921 922 { 923 struct sk_buff *skb; 924 int err; 925 926 /* There is support for UDP large send offload by network 927 * device, so create one single skb packet containing complete 928 * udp datagram 929 */ 930 if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) { 931 skb = sock_alloc_send_skb(sk, 932 hh_len + fragheaderlen + transhdrlen + 20, 933 (flags & MSG_DONTWAIT), &err); 934 if (skb == NULL) 935 return -ENOMEM; 936 937 /* reserve space for Hardware header */ 938 skb_reserve(skb, hh_len); 939 940 /* create space for UDP/IP header */ 941 skb_put(skb,fragheaderlen + transhdrlen); 942 943 /* initialize network header pointer */ 944 skb->nh.raw = skb->data; 945 946 /* initialize protocol header pointer */ 947 skb->h.raw = skb->data + fragheaderlen; 948 949 skb->ip_summed = CHECKSUM_PARTIAL; 950 skb->csum = 0; 951 sk->sk_sndmsg_off = 0; 952 } 953 954 err = skb_append_datato_frags(sk,skb, getfrag, from, 955 (length - transhdrlen)); 956 if (!err) { 957 struct frag_hdr fhdr; 958 959 /* specify the length of each IP datagram fragment*/ 960 skb_shinfo(skb)->gso_size = mtu - fragheaderlen - 961 sizeof(struct frag_hdr); 962 skb_shinfo(skb)->gso_type = SKB_GSO_UDP; 963 ipv6_select_ident(skb, &fhdr); 964 skb_shinfo(skb)->ip6_frag_id = fhdr.identification; 965 __skb_queue_tail(&sk->sk_write_queue, skb); 966 967 return 0; 968 } 969 /* There is not enough support do UPD LSO, 970 * so follow normal path 971 */ 972 kfree_skb(skb); 973 974 return err; 975 } 976 977 int ip6_append_data(struct sock *sk, int getfrag(void *from, char *to, 978 int offset, int len, int odd, struct sk_buff *skb), 979 void *from, int length, int transhdrlen, 980 int hlimit, int tclass, struct ipv6_txoptions *opt, struct flowi *fl, 981 struct rt6_info *rt, unsigned int flags) 982 { 983 struct inet_sock *inet = inet_sk(sk); 984 struct ipv6_pinfo *np = inet6_sk(sk); 985 struct sk_buff *skb; 986 unsigned int maxfraglen, fragheaderlen; 987 int exthdrlen; 988 int hh_len; 989 int mtu; 990 int copy; 991 int err; 992 int offset = 0; 993 int csummode = CHECKSUM_NONE; 994 995 if (flags&MSG_PROBE) 996 return 0; 997 if (skb_queue_empty(&sk->sk_write_queue)) { 998 /* 999 * setup for corking 1000 */ 1001 if (opt) { 1002 if (np->cork.opt == NULL) { 1003 np->cork.opt = kmalloc(opt->tot_len, 1004 sk->sk_allocation); 1005 if (unlikely(np->cork.opt == NULL)) 1006 return -ENOBUFS; 1007 } else if (np->cork.opt->tot_len < opt->tot_len) { 1008 printk(KERN_DEBUG "ip6_append_data: invalid option length\n"); 1009 return -EINVAL; 1010 } 1011 memcpy(np->cork.opt, opt, opt->tot_len); 1012 inet->cork.flags |= IPCORK_OPT; 1013 /* need source address above miyazawa*/ 1014 } 1015 dst_hold(&rt->u.dst); 1016 np->cork.rt = rt; 1017 inet->cork.fl = *fl; 1018 np->cork.hop_limit = hlimit; 1019 np->cork.tclass = tclass; 1020 mtu = dst_mtu(rt->u.dst.path); 1021 if (np->frag_size < mtu) { 1022 if (np->frag_size) 1023 mtu = np->frag_size; 1024 } 1025 inet->cork.fragsize = mtu; 1026 if (dst_allfrag(rt->u.dst.path)) 1027 inet->cork.flags |= IPCORK_ALLFRAG; 1028 inet->cork.length = 0; 1029 sk->sk_sndmsg_page = NULL; 1030 sk->sk_sndmsg_off = 0; 1031 exthdrlen = rt->u.dst.header_len + (opt ? opt->opt_flen : 0); 1032 length += exthdrlen; 1033 transhdrlen += exthdrlen; 1034 } else { 1035 rt = np->cork.rt; 1036 fl = &inet->cork.fl; 1037 if (inet->cork.flags & IPCORK_OPT) 1038 opt = np->cork.opt; 1039 transhdrlen = 0; 1040 exthdrlen = 0; 1041 mtu = inet->cork.fragsize; 1042 } 1043 1044 hh_len = LL_RESERVED_SPACE(rt->u.dst.dev); 1045 1046 fragheaderlen = sizeof(struct ipv6hdr) + rt->u.dst.nfheader_len + (opt ? opt->opt_nflen : 0); 1047 maxfraglen = ((mtu - fragheaderlen) & ~7) + fragheaderlen - sizeof(struct frag_hdr); 1048 1049 if (mtu <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) { 1050 if (inet->cork.length + length > sizeof(struct ipv6hdr) + IPV6_MAXPLEN - fragheaderlen) { 1051 ipv6_local_error(sk, EMSGSIZE, fl, mtu-exthdrlen); 1052 return -EMSGSIZE; 1053 } 1054 } 1055 1056 /* 1057 * Let's try using as much space as possible. 1058 * Use MTU if total length of the message fits into the MTU. 1059 * Otherwise, we need to reserve fragment header and 1060 * fragment alignment (= 8-15 octects, in total). 1061 * 1062 * Note that we may need to "move" the data from the tail of 1063 * of the buffer to the new fragment when we split 1064 * the message. 1065 * 1066 * FIXME: It may be fragmented into multiple chunks 1067 * at once if non-fragmentable extension headers 1068 * are too large. 1069 * --yoshfuji 1070 */ 1071 1072 inet->cork.length += length; 1073 if (((length > mtu) && (sk->sk_protocol == IPPROTO_UDP)) && 1074 (rt->u.dst.dev->features & NETIF_F_UFO)) { 1075 1076 err = ip6_ufo_append_data(sk, getfrag, from, length, hh_len, 1077 fragheaderlen, transhdrlen, mtu, 1078 flags); 1079 if (err) 1080 goto error; 1081 return 0; 1082 } 1083 1084 if ((skb = skb_peek_tail(&sk->sk_write_queue)) == NULL) 1085 goto alloc_new_skb; 1086 1087 while (length > 0) { 1088 /* Check if the remaining data fits into current packet. */ 1089 copy = (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - skb->len; 1090 if (copy < length) 1091 copy = maxfraglen - skb->len; 1092 1093 if (copy <= 0) { 1094 char *data; 1095 unsigned int datalen; 1096 unsigned int fraglen; 1097 unsigned int fraggap; 1098 unsigned int alloclen; 1099 struct sk_buff *skb_prev; 1100 alloc_new_skb: 1101 skb_prev = skb; 1102 1103 /* There's no room in the current skb */ 1104 if (skb_prev) 1105 fraggap = skb_prev->len - maxfraglen; 1106 else 1107 fraggap = 0; 1108 1109 /* 1110 * If remaining data exceeds the mtu, 1111 * we know we need more fragment(s). 1112 */ 1113 datalen = length + fraggap; 1114 if (datalen > (inet->cork.length <= mtu && !(inet->cork.flags & IPCORK_ALLFRAG) ? mtu : maxfraglen) - fragheaderlen) 1115 datalen = maxfraglen - fragheaderlen; 1116 1117 fraglen = datalen + fragheaderlen; 1118 if ((flags & MSG_MORE) && 1119 !(rt->u.dst.dev->features&NETIF_F_SG)) 1120 alloclen = mtu; 1121 else 1122 alloclen = datalen + fragheaderlen; 1123 1124 /* 1125 * The last fragment gets additional space at tail. 1126 * Note: we overallocate on fragments with MSG_MODE 1127 * because we have no idea if we're the last one. 1128 */ 1129 if (datalen == length + fraggap) 1130 alloclen += rt->u.dst.trailer_len; 1131 1132 /* 1133 * We just reserve space for fragment header. 1134 * Note: this may be overallocation if the message 1135 * (without MSG_MORE) fits into the MTU. 1136 */ 1137 alloclen += sizeof(struct frag_hdr); 1138 1139 if (transhdrlen) { 1140 skb = sock_alloc_send_skb(sk, 1141 alloclen + hh_len, 1142 (flags & MSG_DONTWAIT), &err); 1143 } else { 1144 skb = NULL; 1145 if (atomic_read(&sk->sk_wmem_alloc) <= 1146 2 * sk->sk_sndbuf) 1147 skb = sock_wmalloc(sk, 1148 alloclen + hh_len, 1, 1149 sk->sk_allocation); 1150 if (unlikely(skb == NULL)) 1151 err = -ENOBUFS; 1152 } 1153 if (skb == NULL) 1154 goto error; 1155 /* 1156 * Fill in the control structures 1157 */ 1158 skb->ip_summed = csummode; 1159 skb->csum = 0; 1160 /* reserve for fragmentation */ 1161 skb_reserve(skb, hh_len+sizeof(struct frag_hdr)); 1162 1163 /* 1164 * Find where to start putting bytes 1165 */ 1166 data = skb_put(skb, fraglen); 1167 skb->nh.raw = data + exthdrlen; 1168 data += fragheaderlen; 1169 skb->h.raw = data + exthdrlen; 1170 1171 if (fraggap) { 1172 skb->csum = skb_copy_and_csum_bits( 1173 skb_prev, maxfraglen, 1174 data + transhdrlen, fraggap, 0); 1175 skb_prev->csum = csum_sub(skb_prev->csum, 1176 skb->csum); 1177 data += fraggap; 1178 pskb_trim_unique(skb_prev, maxfraglen); 1179 } 1180 copy = datalen - transhdrlen - fraggap; 1181 if (copy < 0) { 1182 err = -EINVAL; 1183 kfree_skb(skb); 1184 goto error; 1185 } else if (copy > 0 && getfrag(from, data + transhdrlen, offset, copy, fraggap, skb) < 0) { 1186 err = -EFAULT; 1187 kfree_skb(skb); 1188 goto error; 1189 } 1190 1191 offset += copy; 1192 length -= datalen - fraggap; 1193 transhdrlen = 0; 1194 exthdrlen = 0; 1195 csummode = CHECKSUM_NONE; 1196 1197 /* 1198 * Put the packet on the pending queue 1199 */ 1200 __skb_queue_tail(&sk->sk_write_queue, skb); 1201 continue; 1202 } 1203 1204 if (copy > length) 1205 copy = length; 1206 1207 if (!(rt->u.dst.dev->features&NETIF_F_SG)) { 1208 unsigned int off; 1209 1210 off = skb->len; 1211 if (getfrag(from, skb_put(skb, copy), 1212 offset, copy, off, skb) < 0) { 1213 __skb_trim(skb, off); 1214 err = -EFAULT; 1215 goto error; 1216 } 1217 } else { 1218 int i = skb_shinfo(skb)->nr_frags; 1219 skb_frag_t *frag = &skb_shinfo(skb)->frags[i-1]; 1220 struct page *page = sk->sk_sndmsg_page; 1221 int off = sk->sk_sndmsg_off; 1222 unsigned int left; 1223 1224 if (page && (left = PAGE_SIZE - off) > 0) { 1225 if (copy >= left) 1226 copy = left; 1227 if (page != frag->page) { 1228 if (i == MAX_SKB_FRAGS) { 1229 err = -EMSGSIZE; 1230 goto error; 1231 } 1232 get_page(page); 1233 skb_fill_page_desc(skb, i, page, sk->sk_sndmsg_off, 0); 1234 frag = &skb_shinfo(skb)->frags[i]; 1235 } 1236 } else if(i < MAX_SKB_FRAGS) { 1237 if (copy > PAGE_SIZE) 1238 copy = PAGE_SIZE; 1239 page = alloc_pages(sk->sk_allocation, 0); 1240 if (page == NULL) { 1241 err = -ENOMEM; 1242 goto error; 1243 } 1244 sk->sk_sndmsg_page = page; 1245 sk->sk_sndmsg_off = 0; 1246 1247 skb_fill_page_desc(skb, i, page, 0, 0); 1248 frag = &skb_shinfo(skb)->frags[i]; 1249 skb->truesize += PAGE_SIZE; 1250 atomic_add(PAGE_SIZE, &sk->sk_wmem_alloc); 1251 } else { 1252 err = -EMSGSIZE; 1253 goto error; 1254 } 1255 if (getfrag(from, page_address(frag->page)+frag->page_offset+frag->size, offset, copy, skb->len, skb) < 0) { 1256 err = -EFAULT; 1257 goto error; 1258 } 1259 sk->sk_sndmsg_off += copy; 1260 frag->size += copy; 1261 skb->len += copy; 1262 skb->data_len += copy; 1263 } 1264 offset += copy; 1265 length -= copy; 1266 } 1267 return 0; 1268 error: 1269 inet->cork.length -= length; 1270 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS); 1271 return err; 1272 } 1273 1274 int ip6_push_pending_frames(struct sock *sk) 1275 { 1276 struct sk_buff *skb, *tmp_skb; 1277 struct sk_buff **tail_skb; 1278 struct in6_addr final_dst_buf, *final_dst = &final_dst_buf; 1279 struct inet_sock *inet = inet_sk(sk); 1280 struct ipv6_pinfo *np = inet6_sk(sk); 1281 struct ipv6hdr *hdr; 1282 struct ipv6_txoptions *opt = np->cork.opt; 1283 struct rt6_info *rt = np->cork.rt; 1284 struct flowi *fl = &inet->cork.fl; 1285 unsigned char proto = fl->proto; 1286 int err = 0; 1287 1288 if ((skb = __skb_dequeue(&sk->sk_write_queue)) == NULL) 1289 goto out; 1290 tail_skb = &(skb_shinfo(skb)->frag_list); 1291 1292 /* move skb->data to ip header from ext header */ 1293 if (skb->data < skb->nh.raw) 1294 __skb_pull(skb, skb->nh.raw - skb->data); 1295 while ((tmp_skb = __skb_dequeue(&sk->sk_write_queue)) != NULL) { 1296 __skb_pull(tmp_skb, skb->h.raw - skb->nh.raw); 1297 *tail_skb = tmp_skb; 1298 tail_skb = &(tmp_skb->next); 1299 skb->len += tmp_skb->len; 1300 skb->data_len += tmp_skb->len; 1301 skb->truesize += tmp_skb->truesize; 1302 __sock_put(tmp_skb->sk); 1303 tmp_skb->destructor = NULL; 1304 tmp_skb->sk = NULL; 1305 } 1306 1307 ipv6_addr_copy(final_dst, &fl->fl6_dst); 1308 __skb_pull(skb, skb->h.raw - skb->nh.raw); 1309 if (opt && opt->opt_flen) 1310 ipv6_push_frag_opts(skb, opt, &proto); 1311 if (opt && opt->opt_nflen) 1312 ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst); 1313 1314 skb->nh.ipv6h = hdr = (struct ipv6hdr*) skb_push(skb, sizeof(struct ipv6hdr)); 1315 1316 *(__be32*)hdr = fl->fl6_flowlabel | 1317 htonl(0x60000000 | ((int)np->cork.tclass << 20)); 1318 1319 if (skb->len <= sizeof(struct ipv6hdr) + IPV6_MAXPLEN) 1320 hdr->payload_len = htons(skb->len - sizeof(struct ipv6hdr)); 1321 else 1322 hdr->payload_len = 0; 1323 hdr->hop_limit = np->cork.hop_limit; 1324 hdr->nexthdr = proto; 1325 ipv6_addr_copy(&hdr->saddr, &fl->fl6_src); 1326 ipv6_addr_copy(&hdr->daddr, final_dst); 1327 1328 skb->priority = sk->sk_priority; 1329 1330 skb->dst = dst_clone(&rt->u.dst); 1331 IP6_INC_STATS(rt->rt6i_idev, IPSTATS_MIB_OUTREQUESTS); 1332 err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dst->dev, dst_output); 1333 if (err) { 1334 if (err > 0) 1335 err = np->recverr ? net_xmit_errno(err) : 0; 1336 if (err) 1337 goto error; 1338 } 1339 1340 out: 1341 inet->cork.flags &= ~IPCORK_OPT; 1342 kfree(np->cork.opt); 1343 np->cork.opt = NULL; 1344 if (np->cork.rt) { 1345 dst_release(&np->cork.rt->u.dst); 1346 np->cork.rt = NULL; 1347 inet->cork.flags &= ~IPCORK_ALLFRAG; 1348 } 1349 memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); 1350 return err; 1351 error: 1352 goto out; 1353 } 1354 1355 void ip6_flush_pending_frames(struct sock *sk) 1356 { 1357 struct inet_sock *inet = inet_sk(sk); 1358 struct ipv6_pinfo *np = inet6_sk(sk); 1359 struct sk_buff *skb; 1360 1361 while ((skb = __skb_dequeue_tail(&sk->sk_write_queue)) != NULL) { 1362 IP6_INC_STATS(ip6_dst_idev(skb->dst), 1363 IPSTATS_MIB_OUTDISCARDS); 1364 kfree_skb(skb); 1365 } 1366 1367 inet->cork.flags &= ~IPCORK_OPT; 1368 1369 kfree(np->cork.opt); 1370 np->cork.opt = NULL; 1371 if (np->cork.rt) { 1372 dst_release(&np->cork.rt->u.dst); 1373 np->cork.rt = NULL; 1374 inet->cork.flags &= ~IPCORK_ALLFRAG; 1375 } 1376 memset(&inet->cork.fl, 0, sizeof(inet->cork.fl)); 1377 } 1378