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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>
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@ -123,10 +123,32 @@ static int vti_rcv_cb(struct sk_buff *skb, int err)
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return 0;
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}
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static bool vti_state_check(const struct xfrm_state *x, __be32 dst, __be32 src)
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{
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xfrm_address_t *daddr = (xfrm_address_t *)&dst;
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xfrm_address_t *saddr = (xfrm_address_t *)&src;
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/* if there is no transform then this tunnel is not functional.
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* Or if the xfrm is not mode tunnel.
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*/
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if (!x || x->props.mode != XFRM_MODE_TUNNEL ||
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x->props.family != AF_INET)
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return false;
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if (!dst)
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return xfrm_addr_equal(saddr, &x->props.saddr, AF_INET);
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if (!xfrm_state_addr_check(x, daddr, saddr, AF_INET))
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return false;
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return true;
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}
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static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
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struct flowi *fl)
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{
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struct ip_tunnel *tunnel = netdev_priv(dev);
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struct ip_tunnel_parm *parms = &tunnel->parms;
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struct dst_entry *dst = skb_dst(skb);
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struct net_device *tdev; /* Device to other host */
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int err;
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@ -143,15 +165,12 @@ static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
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goto tx_error_icmp;
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}
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/* if there is no transform then this tunnel is not functional.
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* Or if the xfrm is not mode tunnel.
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*/
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if (!dst->xfrm ||
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dst->xfrm->props.mode != XFRM_MODE_TUNNEL) {
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if (!vti_state_check(dst->xfrm, parms->iph.daddr, parms->iph.saddr)) {
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dev->stats.tx_carrier_errors++;
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dst_release(dst);
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goto tx_error_icmp;
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}
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tdev = dst->dev;
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if (tdev == dev) {
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