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authorSteffen Klassert <steffen.klassert@secunet.com>2014-03-14 07:28:09 +0100
committerSteffen Klassert <steffen.klassert@secunet.com>2014-03-14 07:28:09 +0100
commit26be8e2db4352d1a69fa40b1126023efd2a26197 (patch)
treefb067beb1cee5d49fa11d2febb46ad2cb6e98d0b /net/ipv6/ip6_vti.c
parent22e1b23dafa8554ef722454e8b84645820cbbc17 (diff)
downloadlinux-26be8e2db4352d1a69fa40b1126023efd2a26197.tar.bz2
vti6: Check the tunnel endpoints of the xfrm state and the vti interface
The tunnel endpoints of the xfrm_state we got from the xfrm_lookup must match the tunnel endpoints of the vti interface. This patch ensures this matching. Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/ipv6/ip6_vti.c')
-rw-r--r--net/ipv6/ip6_vti.c25
1 files changed, 24 insertions, 1 deletions
diff --git a/net/ipv6/ip6_vti.c b/net/ipv6/ip6_vti.c
index 8d189aae7c96..608579312375 100644
--- a/net/ipv6/ip6_vti.c
+++ b/net/ipv6/ip6_vti.c
@@ -376,6 +376,29 @@ vti6_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
}
+static bool vti6_state_check(const struct xfrm_state *x,
+ const struct in6_addr *dst,
+ const struct in6_addr *src)
+{
+ xfrm_address_t *daddr = (xfrm_address_t *)dst;
+ xfrm_address_t *saddr = (xfrm_address_t *)src;
+
+ /* if there is no transform then this tunnel is not functional.
+ * Or if the xfrm is not mode tunnel.
+ */
+ if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
+ x->props.family != AF_INET6)
+ return false;
+
+ if (ipv6_addr_any(dst))
+ return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET6);
+
+ if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET6))
+ return false;
+
+ return true;
+}
+
/**
* vti6_xmit - send a packet
* @skb: the outgoing socket buffer
@@ -402,7 +425,7 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
goto tx_err_link_failure;
}
- if (!dst->xfrm || dst->xfrm->props.mode != XFRM_MODE_TUNNEL)
+ if (!vti6_state_check(dst->xfrm, &t->parms.raddr, &t->parms.laddr))
goto tx_err_link_failure;
tdev = dst->dev;