IPv6: fix IPV6_RECVERR handling of locally-generated errors

PATCH New Brian Haley 1 participant 1 message May 4, 2010

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Brian Haley

author

2010-05-04 01:44 UTC #0 lore raw

PATCH 1/1 IPv6: fix IPV6_RECVERR handling of locally-generated errors

I noticed when I added support for IPV6_DONTFRAG that if you set IPV6_RECVERR and tried to send a UDP packet larger than 64K to an IPv6 destination, you'd correctly get an EMSGSIZE, but reading from MSG_ERRQUEUE returned the incorrect address in the cmsg:

struct msghdr:

	 msg_name         0x7fff8f3c96d0
	 msg_namelen      28
struct sockaddr_in6:
	 sin6_family      10
	 sin6_port        7639
	 sin6_flowinfo    0
	 sin6_addr        ::ffff:38.32.0.0
	 sin6_scope_id    0  ((null))

It should have returned this in my case:

struct msghdr:

	 msg_name         0x7fffd866b510
	 msg_namelen      28
struct sockaddr_in6:
	 sin6_family      10
	 sin6_port        7639
	 sin6_flowinfo    0
	 sin6_addr        2620:0:a09:e000:21f:29ff:fe57:f88b
	 sin6_scope_id    0  ((null))

The problem is that ipv6_recv_error() assumes that if the error wasn't generated by ICMPv6, it's an IPv4 address sitting there, and proceeds to create a v4-mapped address from it.

Change ipv6_icmp_error() and ipv6_local_error() to set skb->protocol to htons(ETH_P_IPV6) so that ipv6_recv_error() knows the address sitting right after the extended error is IPv6, else it will incorrectly map the first octet into an IPv4-mapped IPv6 address in the cmsg structure returned in a recvmsg() call to obtain the error.

Signed-off-by Brian Haley <[email protected]>

net/ipv6/datagram.c +6 -2

index 5959230..7126846 100644
@@ -222,6 +222,8 @@ void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
 	if (!skb)
 		return;
 
+	skb->protocol = htons(ETH_P_IPV6);
+
 	serr = SKB_EXT_ERR(skb);
 	serr->ee.ee_errno = err;
 	serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;

@@ -255,6 +257,8 @@ void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
 	if (!skb)
 		return;
 
+	skb->protocol = htons(ETH_P_IPV6);
+
 	skb_put(skb, sizeof(struct ipv6hdr));
 	skb_reset_network_header(skb);
 	iph = ipv6_hdr(skb);

@@ -358,7 +362,7 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
 		sin->sin6_flowinfo = 0;
 		sin->sin6_port = serr->port;
 		sin->sin6_scope_id = 0;
-		if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
+		if (skb->protocol == htons(ETH_P_IPV6)) {
 			ipv6_addr_copy(&sin->sin6_addr,
 				  (struct in6_addr *)(nh + serr->addr_offset));
 			if (np->sndflow)

@@ -380,7 +384,7 @@ int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
 		sin->sin6_family = AF_INET6;
 		sin->sin6_flowinfo = 0;
 		sin->sin6_scope_id = 0;
-		if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
+		if (skb->protocol == htons(ETH_P_IPV6)) {
 			ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
 			if (np->rxopt.all)
 				datagram_recv_ctl(sk, msg, skb);