ip6_output.c (5f013c9bc70214dcacd5fbed5a06c217d6ff9c59) ip6_output.c (60ff746739bf805a912484643c720b6124826140)
1/*
2 * IPv6 output functions
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/net/ipv4/ip_output.c

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214 hdr->saddr = fl6->saddr;
215 hdr->daddr = *first_hop;
216
217 skb->protocol = htons(ETH_P_IPV6);
218 skb->priority = sk->sk_priority;
219 skb->mark = sk->sk_mark;
220
221 mtu = dst_mtu(dst);
1/*
2 * IPv6 output functions
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * Based on linux/net/ipv4/ip_output.c

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214 hdr->saddr = fl6->saddr;
215 hdr->daddr = *first_hop;
216
217 skb->protocol = htons(ETH_P_IPV6);
218 skb->priority = sk->sk_priority;
219 skb->mark = sk->sk_mark;
220
221 mtu = dst_mtu(dst);
222 if ((skb->len <= mtu) || skb->local_df || skb_is_gso(skb)) {
222 if ((skb->len <= mtu) || skb->ignore_df || skb_is_gso(skb)) {
223 IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
224 IPSTATS_MIB_OUT, skb->len);
225 return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
226 dst->dev, dst_output);
227 }
228
229 skb->dev = dst->dev;
230 ipv6_local_error(sk, EMSGSIZE, fl6, mtu);

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342 return mtu;
343}
344
345static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
346{
347 if (skb->len <= mtu)
348 return false;
349
223 IP6_UPD_PO_STATS(net, ip6_dst_idev(skb_dst(skb)),
224 IPSTATS_MIB_OUT, skb->len);
225 return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
226 dst->dev, dst_output);
227 }
228
229 skb->dev = dst->dev;
230 ipv6_local_error(sk, EMSGSIZE, fl6, mtu);

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342 return mtu;
343}
344
345static bool ip6_pkt_too_big(const struct sk_buff *skb, unsigned int mtu)
346{
347 if (skb->len <= mtu)
348 return false;
349
350 /* ipv6 conntrack defrag sets max_frag_size + local_df */
350 /* ipv6 conntrack defrag sets max_frag_size + ignore_df */
351 if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
352 return true;
353
351 if (IP6CB(skb)->frag_max_size && IP6CB(skb)->frag_max_size > mtu)
352 return true;
353
354 if (skb->local_df)
354 if (skb->ignore_df)
355 return false;
356
357 if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
358 return false;
359
360 return true;
361}
362

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554 hlen = ip6_find_1stfragopt(skb, &prevhdr);
555 nexthdr = *prevhdr;
556
557 mtu = ip6_skb_dst_mtu(skb);
558
559 /* We must not fragment if the socket is set to force MTU discovery
560 * or if the skb it not generated by a local socket.
561 */
355 return false;
356
357 if (skb_is_gso(skb) && skb_gso_network_seglen(skb) <= mtu)
358 return false;
359
360 return true;
361}
362

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554 hlen = ip6_find_1stfragopt(skb, &prevhdr);
555 nexthdr = *prevhdr;
556
557 mtu = ip6_skb_dst_mtu(skb);
558
559 /* We must not fragment if the socket is set to force MTU discovery
560 * or if the skb it not generated by a local socket.
561 */
562 if (unlikely(!skb->local_df && skb->len > mtu) ||
562 if (unlikely(!skb->ignore_df && skb->len > mtu) ||
563 (IP6CB(skb)->frag_max_size &&
564 IP6CB(skb)->frag_max_size > mtu)) {
565 if (skb->sk && dst_allfrag(skb_dst(skb)))
566 sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
567
568 skb->dev = skb_dst(skb)->dev;
569 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
570 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),

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1229 unsigned int maxnonfragsize, headersize;
1230
1231 headersize = sizeof(struct ipv6hdr) +
1232 (opt ? opt->tot_len : 0) +
1233 (dst_allfrag(&rt->dst) ?
1234 sizeof(struct frag_hdr) : 0) +
1235 rt->rt6i_nfheader_len;
1236
563 (IP6CB(skb)->frag_max_size &&
564 IP6CB(skb)->frag_max_size > mtu)) {
565 if (skb->sk && dst_allfrag(skb_dst(skb)))
566 sk_nocaps_add(skb->sk, NETIF_F_GSO_MASK);
567
568 skb->dev = skb_dst(skb)->dev;
569 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
570 IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),

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1229 unsigned int maxnonfragsize, headersize;
1230
1231 headersize = sizeof(struct ipv6hdr) +
1232 (opt ? opt->tot_len : 0) +
1233 (dst_allfrag(&rt->dst) ?
1234 sizeof(struct frag_hdr) : 0) +
1235 rt->rt6i_nfheader_len;
1236
1237 if (ip6_sk_local_df(sk))
1237 if (ip6_sk_ignore_df(sk))
1238 maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN;
1239 else
1240 maxnonfragsize = mtu;
1241
1242 /* dontfrag active */
1243 if ((cork->length + length > mtu - headersize) && dontfrag &&
1244 (sk->sk_protocol == IPPROTO_UDP ||
1245 sk->sk_protocol == IPPROTO_RAW)) {

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1539 skb->len += tmp_skb->len;
1540 skb->data_len += tmp_skb->len;
1541 skb->truesize += tmp_skb->truesize;
1542 tmp_skb->destructor = NULL;
1543 tmp_skb->sk = NULL;
1544 }
1545
1546 /* Allow local fragmentation. */
1238 maxnonfragsize = sizeof(struct ipv6hdr) + IPV6_MAXPLEN;
1239 else
1240 maxnonfragsize = mtu;
1241
1242 /* dontfrag active */
1243 if ((cork->length + length > mtu - headersize) && dontfrag &&
1244 (sk->sk_protocol == IPPROTO_UDP ||
1245 sk->sk_protocol == IPPROTO_RAW)) {

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1539 skb->len += tmp_skb->len;
1540 skb->data_len += tmp_skb->len;
1541 skb->truesize += tmp_skb->truesize;
1542 tmp_skb->destructor = NULL;
1543 tmp_skb->sk = NULL;
1544 }
1545
1546 /* Allow local fragmentation. */
1547 skb->local_df = ip6_sk_local_df(sk);
1547 skb->ignore_df = ip6_sk_ignore_df(sk);
1548
1549 *final_dst = fl6->daddr;
1550 __skb_pull(skb, skb_network_header_len(skb));
1551 if (opt && opt->opt_flen)
1552 ipv6_push_frag_opts(skb, opt, &proto);
1553 if (opt && opt->opt_nflen)
1554 ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
1555

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1549 *final_dst = fl6->daddr;
1550 __skb_pull(skb, skb_network_header_len(skb));
1551 if (opt && opt->opt_flen)
1552 ipv6_push_frag_opts(skb, opt, &proto);
1553 if (opt && opt->opt_nflen)
1554 ipv6_push_nfrag_opts(skb, opt, &proto, &final_dst);
1555

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