net: icmpv6: Fix payload length and checksum

With fragmentation disabled echo server responds to packet fragment with ICMPv6 message Type: "Parameter Problem (4)", Code: "unrecognized Next Header type encountered (1)". If a fragment with payload length 15 is received in response sent by echo server IPv6 payload length and ICMPv6 checksum are wrong. This patch solves the issue by correcting payload length. Signed-off-by: Ruslan Mstoi <[email protected]>
EricNRS · May 2, 2018 · d171568 · d171568
1 parent 878f39c
commit d171568
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/subsys/net/ip/icmpv6.c b/subsys/net/ip/icmpv6.c
@@ -537,6 +537,8 @@ int net_icmpv6_send_error(struct net_pkt *orig, u8_t type, u8_t code,
 	} else if (NET_IPV6_HDR(orig)->nexthdr == IPPROTO_TCP) {
 		extra_len = sizeof(struct net_ipv6_hdr) +
 			sizeof(struct net_tcp_hdr);
+	} else if (NET_IPV6_HDR(orig)->nexthdr == NET_IPV6_NEXTHDR_FRAG) {
+		extra_len = net_pkt_get_len(orig);
 	} else {
 		size_t space = CONFIG_NET_BUF_DATA_SIZE -
 			net_if_get_ll_reserve(iface,