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Don't forward IPv6 packets that are larger than outgoing MTU, send ICMPv6 message back for Path MTU discovery.

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This commit is contained in:
idelamer 2011-06-22 12:14:58 +00:00
parent 0f56d838ec
commit 4eb5acd9e2
1 changed files with 11 additions and 0 deletions
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11
src/core/ipv6/ip6.c
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@ -295,6 +295,17 @@ ip6_forward(struct pbuf *p, struct ip6_hdr *iphdr, struct netif *inp)
return;
}
if (netif->mtu && (p->tot_len > netif->mtu)) {
#if LWIP_ICMP6
/* Don't send ICMP messages in response to ICMP messages */
if (IP6H_NEXTH(iphdr) != IP6_NEXTH_ICMP6) {
icmp6_packet_too_big(p, netif->mtu);
}
#endif /* LWIP_ICMP6 */
IP6_STATS_INC(ip6.drop);
return;
}
LWIP_DEBUGF(IP6_DEBUG, ("ip6_forward: forwarding packet to %"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F":%"X16_F"\n",
IP6_ADDR_BLOCK1(ip6_current_dest_addr()),
IP6_ADDR_BLOCK2(ip6_current_dest_addr()),