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| author | Steffen Klassert <steffen.klassert@secunet.com> | 2014-02-21 08:41:11 +0100 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2014-02-25 07:04:19 +0100 |
| commit | 6e2de802af32704d9bc4af0c437da7045960112b (patch) | |
| tree | a0ce63f698c25dfbd32f89320c15ba10a39d10d5 /net/ipv4/ip_vti.c | |
| parent | 78a010cca000aafc6a8503eb2be590a533589a27 (diff) | |
| download | linux-6e2de802af32704d9bc4af0c437da7045960112b.tar.bz2 | |
vti4: 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/ipv4/ip_vti.c')
| -rw-r--r-- | net/ipv4/ip_vti.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/net/ipv4/ip_vti.c b/net/ipv4/ip_vti.c index 9369b7c03f1c..9471893df47c 100644 --- a/net/ipv4/ip_vti.c +++ b/net/ipv4/ip_vti.c @@ -123,10 +123,32 @@ static int vti_rcv_cb(struct sk_buff *skb, int err) return 0; } +static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 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_INET) + return false; + + if (!dst) + return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET); + + if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET)) + return false; + + return true; +} + static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl) { struct ip_tunnel *tunnel = netdev_priv(dev); + struct ip_tunnel_parm *parms = &tunnel->parms; struct dst_entry *dst = skb_dst(skb); struct net_device *tdev; /* Device to other host */ int err; @@ -143,15 +165,12 @@ static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev, goto tx_error_icmp; } - /* if there is no transform then this tunnel is not functional. - * Or if the xfrm is not mode tunnel. - */ - if (!dst->xfrm || - dst->xfrm->props.mode != XFRM_MODE_TUNNEL) { + if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) { dev->stats.tx_carrier_errors++; dst_release(dst); goto tx_error_icmp; } + tdev = dst->dev; if (tdev == dev) { |