diff options
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/ah6.c | 3 | ||||
| -rw-r--r-- | net/ipv6/esp6.c | 2 | ||||
| -rw-r--r-- | net/ipv6/icmp.c | 6 | ||||
| -rw-r--r-- | net/ipv6/ipcomp6.c | 2 | ||||
| -rw-r--r-- | net/ipv6/raw.c | 5 | ||||
| -rw-r--r-- | net/ipv6/route.c | 143 | ||||
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 2 | ||||
| -rw-r--r-- | net/ipv6/udp.c | 3 |
8 files changed, 48 insertions, 118 deletions
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c index f1a4a2c28ed3..49d4d26bda88 100644 --- a/net/ipv6/ah6.c +++ b/net/ipv6/ah6.c @@ -35,6 +35,7 @@ #include <linux/pfkeyv2.h> #include <linux/string.h> #include <linux/scatterlist.h> +#include <net/ip6_route.h> #include <net/icmp.h> #include <net/ipv6.h> #include <net/protocol.h> @@ -621,7 +622,7 @@ static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, NETDEBUG(KERN_DEBUG "pmtu discovery on SA AH/%08x/%pI6\n", ntohl(ah->spi), &iph->daddr); - + ip6_update_pmtu(skb, net, info, 0, 0); xfrm_state_put(x); } diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c index db1521fcda5b..89a615ba84f8 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -39,6 +39,7 @@ #include <linux/random.h> #include <linux/slab.h> #include <linux/spinlock.h> +#include <net/ip6_route.h> #include <net/icmp.h> #include <net/ipv6.h> #include <net/protocol.h> @@ -442,6 +443,7 @@ static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, return; pr_debug("pmtu discovery on SA ESP/%08x/%pI6\n", ntohl(esph->spi), &iph->daddr); + ip6_update_pmtu(skb, net, info, 0, 0); xfrm_state_put(x); } diff --git a/net/ipv6/icmp.c b/net/ipv6/icmp.c index ed89bba745a1..5247d5c211f9 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -649,7 +649,6 @@ static int icmpv6_rcv(struct sk_buff *skb) struct net_device *dev = skb->dev; struct inet6_dev *idev = __in6_dev_get(dev); const struct in6_addr *saddr, *daddr; - const struct ipv6hdr *orig_hdr; struct icmp6hdr *hdr; u8 type; @@ -661,7 +660,7 @@ static int icmpv6_rcv(struct sk_buff *skb) XFRM_STATE_ICMP)) goto drop_no_count; - if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(*orig_hdr))) + if (!pskb_may_pull(skb, sizeof(*hdr) + sizeof(struct ipv6hdr))) goto drop_no_count; nh = skb_network_offset(skb); @@ -722,9 +721,6 @@ static int icmpv6_rcv(struct sk_buff *skb) if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) goto discard_it; hdr = icmp6_hdr(skb); - orig_hdr = (struct ipv6hdr *) (hdr + 1); - rt6_pmtu_discovery(&orig_hdr->daddr, &orig_hdr->saddr, dev, - ntohl(hdr->icmp6_mtu)); /* * Drop through to notify diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c index 5cb75bfe45b1..92832385a8ef 100644 --- a/net/ipv6/ipcomp6.c +++ b/net/ipv6/ipcomp6.c @@ -46,6 +46,7 @@ #include <linux/list.h> #include <linux/vmalloc.h> #include <linux/rtnetlink.h> +#include <net/ip6_route.h> #include <net/icmp.h> #include <net/ipv6.h> #include <net/protocol.h> @@ -74,6 +75,7 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, pr_debug("pmtu discovery on SA IPCOMP/%08x/%pI6\n", spi, &iph->daddr); + ip6_update_pmtu(skb, net, info, 0, 0); xfrm_state_put(x); } diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index 93d69836fded..43b0042f15f4 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -328,9 +328,10 @@ static void rawv6_err(struct sock *sk, struct sk_buff *skb, return; harderr = icmpv6_err_convert(type, code, &err); - if (type == ICMPV6_PKT_TOOBIG) + if (type == ICMPV6_PKT_TOOBIG) { + ip6_sk_update_pmtu(skb, sk, info); harderr = (np->pmtudisc == IPV6_PMTUDISC_DO); - + } if (np->recverr) { u8 *payload = skb->data; if (!inet->hdrincl) diff --git a/net/ipv6/route.c b/net/ipv6/route.c index 58a3ec23da2f..0d41f68daff2 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1049,7 +1049,10 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) { struct rt6_info *rt6 = (struct rt6_info*)dst; + dst_confirm(dst); if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) { + struct net *net = dev_net(dst->dev); + rt6->rt6i_flags |= RTF_MODIFIED; if (mtu < IPV6_MIN_MTU) { u32 features = dst_metric(dst, RTAX_FEATURES); @@ -1058,9 +1061,39 @@ static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu) dst_metric_set(dst, RTAX_FEATURES, features); } dst_metric_set(dst, RTAX_MTU, mtu); + rt6_update_expires(rt6, net->ipv6.sysctl.ip6_rt_mtu_expires); } } +void ip6_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, + int oif, __be32 mark) +{ + const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; + struct dst_entry *dst; + struct flowi6 fl6; + + memset(&fl6, 0, sizeof(fl6)); + fl6.flowi6_oif = oif; + fl6.flowi6_mark = mark; + fl6.flowi6_flags = FLOWI_FLAG_PRECOW_METRICS; + fl6.daddr = iph->daddr; + fl6.saddr = iph->saddr; + fl6.flowlabel = (*(__be32 *) iph) & IPV6_FLOWINFO_MASK; + + dst = ip6_route_output(net, NULL, &fl6); + if (!dst->error) + ip6_rt_update_pmtu(dst, ntohl(mtu)); + dst_release(dst); +} +EXPORT_SYMBOL_GPL(ip6_update_pmtu); + +void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) +{ + ip6_update_pmtu(skb, sock_net(sk), mtu, + sk->sk_bound_dev_if, sk->sk_mark); +} +EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); + static unsigned int ip6_default_advmss(const struct dst_entry *dst) { struct net_device *dev = dst->dev; @@ -1704,116 +1737,6 @@ out: } /* - * Handle ICMP "packet too big" messages - * i.e. Path MTU discovery - */ - -static void rt6_do_pmtu_disc(const struct in6_addr *daddr, const struct in6_addr *saddr, - struct net *net, u32 pmtu, int ifindex) -{ - struct rt6_info *rt, *nrt; - int allfrag = 0; -again: - rt = rt6_lookup(net, daddr, saddr, ifindex, 0); - if (!rt) - return; - - if (rt6_check_expired(rt)) { - ip6_del_rt(rt); - goto again; - } - - if (pmtu >= dst_mtu(&rt->dst)) - goto out; - - if (pmtu < IPV6_MIN_MTU) { - /* - * According to RFC2460, PMTU is set to the IPv6 Minimum Link - * MTU (1280) and a fragment header should always be included - * after a node receiving Too Big message reporting PMTU is - * less than the IPv6 Minimum Link MTU. - */ - pmtu = IPV6_MIN_MTU; - allfrag = 1; - } - - /* New mtu received -> path was valid. - They are sent only in response to data packets, - so that this nexthop apparently is reachable. --ANK - */ - dst_confirm(&rt->dst); - - /* Host route. If it is static, it would be better - not to override it, but add new one, so that - when cache entry will expire old pmtu - would return automatically. - */ - if (rt->rt6i_flags & RTF_CACHE) { - dst_metric_set(&rt->dst, RTAX_MTU, pmtu); - if (allfrag) { - u32 features = dst_metric(&rt->dst, RTAX_FEATURES); - features |= RTAX_FEATURE_ALLFRAG; - dst_metric_set(&rt->dst, RTAX_FEATURES, features); - } - rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires); - rt->rt6i_flags |= RTF_MODIFIED; - goto out; - } - - /* Network route. - Two cases are possible: - 1. It is connected route. Action: COW - 2. It is gatewayed route or NONEXTHOP route. Action: clone it. - */ - if (!dst_get_neighbour_noref_raw(&rt->dst) && !(rt->rt6i_flags & RTF_NONEXTHOP)) - nrt = rt6_alloc_cow(rt, daddr, saddr); - else - nrt = rt6_alloc_clone(rt, daddr); - - if (nrt) { - dst_metric_set(&nrt->dst, RTAX_MTU, pmtu); - if (allfrag) { - u32 features = dst_metric(&nrt->dst, RTAX_FEATURES); - features |= RTAX_FEATURE_ALLFRAG; - dst_metric_set(&nrt->dst, RTAX_FEATURES, features); - } - - /* According to RFC 1981, detecting PMTU increase shouldn't be - * happened within 5 mins, the recommended timer is 10 mins. - * Here this route expiration time is set to ip6_rt_mtu_expires - * which is 10 mins. After 10 mins the decreased pmtu is expired - * and detecting PMTU increase will be automatically happened. - */ - rt6_update_expires(nrt, net->ipv6.sysctl.ip6_rt_mtu_expires); - nrt->rt6i_flags |= RTF_DYNAMIC; - ip6_ins_rt(nrt); - } -out: - dst_release(&rt->dst); -} - -void rt6_pmtu_discovery(const struct in6_addr *daddr, const struct in6_addr *saddr, - struct net_device *dev, u32 pmtu) -{ - struct net *net = dev_net(dev); - - /* - * RFC 1981 states that a node "MUST reduce the size of the packets it - * is sending along the path" that caused the Packet Too Big message. - * Since it's not possible in the general case to determine which - * interface was used to send the original packet, we update the MTU - * on the interface that will be used to send future packets. We also - * update the MTU on the interface that received the Packet Too Big in - * case the original packet was forced out that interface with - * SO_BINDTODEVICE or similar. This is the next best thing to the - * correct behaviour, which would be to update the MTU on all - * interfaces. - */ - rt6_do_pmtu_disc(daddr, saddr, net, pmtu, 0); - rt6_do_pmtu_disc(daddr, saddr, net, pmtu, dev->ifindex); -} - -/* * Misc support functions */ diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index f91b0bfd12d5..26a88623940b 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -415,6 +415,8 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, } else dst_hold(dst); + dst->ops->update_pmtu(dst, ntohl(info)); + if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) { tcp_sync_mss(sk, dst_mtu(dst)); tcp_simple_retransmit(sk); diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index f05099fc5901..051ad481973f 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -479,6 +479,9 @@ void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (sk == NULL) return; + if (type == ICMPV6_PKT_TOOBIG) + ip6_sk_update_pmtu(skb, sk, info); + np = inet6_sk(sk); if (!icmpv6_err_convert(type, code, &err) && !np->recverr) |
