diff options
| -rw-r--r-- | net/ipv6/ah6.c | 2 | ||||
| -rw-r--r-- | net/ipv6/esp6.c | 2 | ||||
| -rw-r--r-- | net/ipv6/icmp.c | 2 | ||||
| -rw-r--r-- | net/ipv6/ipcomp6.c | 2 | ||||
| -rw-r--r-- | net/ipv6/ndisc.c | 3 | ||||
| -rw-r--r-- | net/ipv6/route.c | 81 |
6 files changed, 81 insertions, 11 deletions
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c index bb02e17..73784c3 100644 --- a/net/ipv6/ah6.c +++ b/net/ipv6/ah6.c @@ -628,7 +628,7 @@ static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, return; if (type == NDISC_REDIRECT) - ip6_redirect(skb, net, 0, 0); + ip6_redirect(skb, net, skb->dev->ifindex, 0); else 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 aeac0dc..d3618a7 100644 --- a/net/ipv6/esp6.c +++ b/net/ipv6/esp6.c @@ -447,7 +447,7 @@ static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, return; if (type == NDISC_REDIRECT) - ip6_redirect(skb, net, 0, 0); + ip6_redirect(skb, net, skb->dev->ifindex, 0); else 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 7cfc8d2..73681c2 100644 --- a/net/ipv6/icmp.c +++ b/net/ipv6/icmp.c @@ -92,7 +92,7 @@ static void icmpv6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (type == ICMPV6_PKT_TOOBIG) ip6_update_pmtu(skb, net, info, 0, 0); else if (type == NDISC_REDIRECT) - ip6_redirect(skb, net, 0, 0); + ip6_redirect(skb, net, skb->dev->ifindex, 0); if (!(type & ICMPV6_INFOMSG_MASK)) if (icmp6->icmp6_type == ICMPV6_ECHO_REQUEST) diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c index 7af5aee..5636a91 100644 --- a/net/ipv6/ipcomp6.c +++ b/net/ipv6/ipcomp6.c @@ -76,7 +76,7 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, return; if (type == NDISC_REDIRECT) - ip6_redirect(skb, net, 0, 0); + ip6_redirect(skb, net, skb->dev->ifindex, 0); else ip6_update_pmtu(skb, net, info, 0, 0); xfrm_state_put(x); diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index 2221065..c4bc7a3 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -1367,7 +1367,8 @@ static void ndisc_redirect_rcv(struct sk_buff *skb) return; if (!ndopts.nd_opts_rh) { - ip6_redirect_no_header(skb, dev_net(skb->dev), 0, 0); + ip6_redirect_no_header(skb, dev_net(skb->dev), + skb->dev->ifindex, 0); return; } diff --git a/net/ipv6/route.c b/net/ipv6/route.c index b770085..c979dd9 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -1156,6 +1156,77 @@ void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu) } EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu); +/* Handle redirects */ +struct ip6rd_flowi { + struct flowi6 fl6; + struct in6_addr gateway; +}; + +static struct rt6_info *__ip6_route_redirect(struct net *net, + struct fib6_table *table, + struct flowi6 *fl6, + int flags) +{ + struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6; + struct rt6_info *rt; + struct fib6_node *fn; + + /* Get the "current" route for this destination and + * check if the redirect has come from approriate router. + * + * RFC 4861 specifies that redirects should only be + * accepted if they come from the nexthop to the target. + * Due to the way the routes are chosen, this notion + * is a bit fuzzy and one might need to check all possible + * routes. + */ + + read_lock_bh(&table->tb6_lock); + fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr); +restart: + for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) { + if (rt6_check_expired(rt)) + continue; + if (rt->dst.error) + break; + if (!(rt->rt6i_flags & RTF_GATEWAY)) + continue; + if (fl6->flowi6_oif != rt->dst.dev->ifindex) + continue; + if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway)) + continue; + break; + } + + if (!rt) + rt = net->ipv6.ip6_null_entry; + else if (rt->dst.error) { + rt = net->ipv6.ip6_null_entry; + goto out; + } + BACKTRACK(net, &fl6->saddr); +out: + dst_hold(&rt->dst); + + read_unlock_bh(&table->tb6_lock); + + return rt; +}; + +static struct dst_entry *ip6_route_redirect(struct net *net, + const struct flowi6 *fl6, + const struct in6_addr *gateway) +{ + int flags = RT6_LOOKUP_F_HAS_SADDR; + struct ip6rd_flowi rdfl; + + rdfl.fl6 = *fl6; + rdfl.gateway = *gateway; + + return fib6_rule_lookup(net, &rdfl.fl6, + flags, __ip6_route_redirect); +} + void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) { const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data; @@ -1170,9 +1241,8 @@ void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark) fl6.saddr = iph->saddr; fl6.flowlabel = ip6_flowinfo(iph); - dst = ip6_route_output(net, NULL, &fl6); - if (!dst->error) - rt6_do_redirect(dst, NULL, skb); + dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr); + rt6_do_redirect(dst, NULL, skb); dst_release(dst); } EXPORT_SYMBOL_GPL(ip6_redirect); @@ -1192,9 +1262,8 @@ void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif, fl6.daddr = msg->dest; fl6.saddr = iph->daddr; - dst = ip6_route_output(net, NULL, &fl6); - if (!dst->error) - rt6_do_redirect(dst, NULL, skb); + dst = ip6_route_redirect(net, &fl6, &iph->saddr); + rt6_do_redirect(dst, NULL, skb); dst_release(dst); } |