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| author | Brian Haley <brian.haley@hp.com> | 2010-05-03 15:44:27 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-05-05 21:32:40 -0700 |
| commit | d40a4de0be08f005814a4fddac748fe5353208ec (patch) | |
| tree | 82b5bf934623d92ec178ec62339e4ff29f23c25b | |
| parent | 7df9c43fbe470628a755dfd028e58fdd7ab9b44e (diff) | |
| download | linux-3.10-d40a4de0be08f005814a4fddac748fe5353208ec.tar.gz linux-3.10-d40a4de0be08f005814a4fddac748fe5353208ec.tar.bz2 linux-3.10-d40a4de0be08f005814a4fddac748fe5353208ec.zip | |
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 <brian.haley@hp.com>
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Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/ipv6/datagram.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c index 622dc7939a1..61573885e45 100644 --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -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); @@ -319,7 +323,7 @@ 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) @@ -341,7 +345,7 @@ 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); |