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xfrm: Add xfrm_tunnel_skb_cb to the skb common buffer

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IPsec vti_rcv needs to remind the tunnel pointer to
check it later at the vti_rcv_cb callback. So add
this pointer to the IPsec common buffer, initialize
it and check it to avoid transport state matching of
a tunneled packet.

Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Steffen Klassert 2014-02-21 08:41:09 +01:00
parent d099160e02
commit 70be6c91c8
3 changed files with 50 additions and 12 deletions
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50
include/net/xfrm.h
View file

@ -599,16 +599,27 @@ struct xfrm_mgr {
int xfrm_register_km(struct xfrm_mgr *km);
int xfrm_unregister_km(struct xfrm_mgr *km);
struct xfrm_tunnel_skb_cb {
union {
struct inet_skb_parm h4;
struct inet6_skb_parm h6;
} header;
union {
struct ip_tunnel *ip4;
struct ip6_tnl *ip6;
} tunnel;
};
#define XFRM_TUNNEL_SKB_CB(__skb) ((struct xfrm_tunnel_skb_cb *)&((__skb)->cb[0]))
/*
* This structure is used for the duration where packets are being
* transformed by IPsec. As soon as the packet leaves IPsec the
* area beyond the generic IP part may be overwritten.
*/
struct xfrm_skb_cb {
union {
struct inet_skb_parm h4;
struct inet6_skb_parm h6;
} header;
struct xfrm_tunnel_skb_cb header;
/* Sequence number for replay protection. */
union {
@ -630,10 +641,7 @@ struct xfrm_skb_cb {
* to transmit header information to the mode input/output functions.
*/
struct xfrm_mode_skb_cb {
union {
struct inet_skb_parm h4;
struct inet6_skb_parm h6;
} header;
struct xfrm_tunnel_skb_cb header;
/* Copied from header for IPv4, always set to zero and DF for IPv6. */
__be16 id;
@ -665,10 +673,7 @@ struct xfrm_mode_skb_cb {
* related information.
*/
struct xfrm_spi_skb_cb {
union {
struct inet_skb_parm h4;
struct inet6_skb_parm h6;
} header;
struct xfrm_tunnel_skb_cb header;
unsigned int daddroff;
unsigned int family;
@ -1510,6 +1515,7 @@ int xfrm4_rcv(struct sk_buff *skb);
static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
{
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
return xfrm_input(skb, nexthdr, spi, 0);
@ -1781,4 +1787,24 @@ static inline int xfrm_rcv_cb(struct sk_buff *skb, unsigned int family,
return 0;
}
static inline int xfrm_tunnel_check(struct sk_buff *skb, struct xfrm_state *x,
unsigned int family)
{
bool tunnel = false;
switch(family) {
case AF_INET:
if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4)
tunnel = true;
break;
case AF_INET6:
if (XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6)
tunnel = true;
break;
}
if (tunnel && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL))
return -EINVAL;
return 0;
}
#endif /* _NET_XFRM_H */

7
net/ipv4/xfrm4_protocol.c
View file

@ -65,6 +65,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
int ret;
struct xfrm4_protocol *handler;
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
XFRM_SPI_SKB_CB(skb)->family = AF_INET;
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct iphdr, daddr);
@ -84,6 +85,8 @@ static int xfrm4_esp_rcv(struct sk_buff *skb)
int ret;
struct xfrm4_protocol *handler;
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
for_each_protocol_rcu(esp4_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
return ret;
@ -108,6 +111,8 @@ static int xfrm4_ah_rcv(struct sk_buff *skb)
int ret;
struct xfrm4_protocol *handler;
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
for_each_protocol_rcu(ah4_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
return ret;;
@ -132,6 +137,8 @@ static int xfrm4_ipcomp_rcv(struct sk_buff *skb)
int ret;
struct xfrm4_protocol *handler;
XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip4 = NULL;
for_each_protocol_rcu(ipcomp4_handlers, handler)
if ((ret = handler->handler(skb)) != -EINVAL)
return ret;

5
net/xfrm/xfrm_input.c
View file

@ -163,6 +163,11 @@ int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type)
skb->sp->xvec[skb->sp->len++] = x;
if (xfrm_tunnel_check(skb, x, family)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
goto drop;
}
spin_lock(&x->lock);
if (unlikely(x->km.state == XFRM_STATE_ACQ)) {
XFRM_INC_STATS(net, LINUX_MIB_XFRMACQUIREERROR);