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| author | Hannes Frederic Sowa <hannes@stressinduktion.org> | 2014-01-20 05:16:39 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-01-21 16:59:19 -0800 |
| commit | 82b276cd2b0bacd58e7c307bf8856925a68c4d14 (patch) | |
| tree | ffc8648efa91f83f81c94ac83447dc5246a835cf /net/ipv6 | |
| parent | 446fab59333dea91e54688f033dd8d788d0486fb (diff) | |
| download | linux-82b276cd2b0bacd58e7c307bf8856925a68c4d14.tar.gz linux-82b276cd2b0bacd58e7c307bf8856925a68c4d14.tar.bz2 linux-82b276cd2b0bacd58e7c307bf8856925a68c4d14.zip | |
ipv6: protect protocols not handling ipv4 from v4 connection/bind attempts
Some ipv6 protocols cannot handle ipv4 addresses, so we must not allow
connecting and binding to them. sendmsg logic does already check msg->name
for this but must trust already connected sockets which could be set up
for connection to ipv4 address family.
Per-socket flag ipv6only is of no use here, as it is under users control
by setsockopt.
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/datagram.c | 10 | ||||
| -rw-r--r-- | net/ipv6/ping.c | 2 | ||||
| -rw-r--r-- | net/ipv6/raw.c | 6 |
3 files changed, 16 insertions, 2 deletions
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c index cd8699bd2e6b..2f5e2f154d21 100644 --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -205,6 +205,16 @@ out: } EXPORT_SYMBOL_GPL(ip6_datagram_connect); +int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, + int addr_len) +{ + DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); + if (sin6->sin6_family != AF_INET6) + return -EAFNOSUPPORT; + return ip6_datagram_connect(sk, uaddr, addr_len); +} +EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); + void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, __be16 port, u32 info, u8 *payload) { diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c index 94a3d04c3200..fb9beb78f00b 100644 --- a/net/ipv6/ping.c +++ b/net/ipv6/ping.c @@ -31,7 +31,7 @@ struct proto pingv6_prot = { .owner = THIS_MODULE, .init = ping_init_sock, .close = ping_close, - .connect = ip6_datagram_connect, + .connect = ip6_datagram_connect_v6_only, .disconnect = udp_disconnect, .setsockopt = ipv6_setsockopt, .getsockopt = ipv6_getsockopt, diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c index b4523117aeae..1f29996e368a 100644 --- a/net/ipv6/raw.c +++ b/net/ipv6/raw.c @@ -250,6 +250,10 @@ static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) if (addr_len < SIN6_LEN_RFC2133) return -EINVAL; + + if (addr->sin6_family != AF_INET6) + return -EINVAL; + addr_type = ipv6_addr_type(&addr->sin6_addr); /* Raw sockets are IPv6 only */ @@ -1209,7 +1213,7 @@ struct proto rawv6_prot = { .owner = THIS_MODULE, .close = rawv6_close, .destroy = raw6_destroy, - .connect = ip6_datagram_connect, + .connect = ip6_datagram_connect_v6_only, .disconnect = udp_disconnect, .ioctl = rawv6_ioctl, .init = rawv6_init_sk, |