xfrm: make local error reporting more robust In xfrm4 and xfrm6 we need to take care about sockets of the other address family. This could happen because a 6in4 or 4in6 tunnel could get protected by ipsec. Because we don't want to have a run-time dependency on ipv6 when only using ipv4 xfrm we have to embed a pointer to the correct local_error function in xfrm_state_afinet and look it up when returning an error depending on the socket address family. Thanks to vi0ss for the great bug report: <https://bugzilla.kernel.org/show_bug.cgi?id=58691> v2: a) fix two more unsafe interpretations of skb->sk as ipv6 socket (xfrm6_local_dontfrag and __xfrm6_output) v3: a) add an EXPORT_SYMBOL_GPL(xfrm_local_error) to fix a link error when building ipv6 as a module (thanks to Steffen Klassert) Reported-by: <vi0oss@gmail.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c index 78f66fa..54c0acd 100644 --- a/net/xfrm/xfrm_state.c +++ b/net/xfrm/xfrm_state.c
@@ -39,9 +39,6 @@ static unsigned int xfrm_state_hashmax __read_mostly = 1 * 1024 * 1024; -static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family); -static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo); - static inline unsigned int xfrm_dst_hash(struct net *net, const xfrm_address_t *daddr, const xfrm_address_t *saddr, @@ -1860,7 +1857,7 @@ } EXPORT_SYMBOL(xfrm_state_unregister_afinfo); -static struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) +struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family) { struct xfrm_state_afinfo *afinfo; if (unlikely(family >= NPROTO)) @@ -1872,7 +1869,7 @@ return afinfo; } -static void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) +void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo) { rcu_read_unlock(); }