[NETFILTER]: Fix xfrm lookup in ip_route_me_harder/ip6_route_me_harder
ip_route_me_harder doesn't use the port numbers of the xfrm lookup and
uses ip_route_input for non-local addresses which doesn't do a xfrm
lookup, ip6_route_me_harder doesn't do a xfrm lookup at all.
Use xfrm_decode_session and do the lookup manually, make sure both
only do the lookup if the packet hasn't been transformed already.
Makeing sure the lookup only happens once needs a new field in the
IP6CB, which exceeds the size of skb->cb. The size of skb->cb is
increased to 48b. Apparently the IPv6 mobile extensions need some
more room anyway.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 65c3a91..de16e94 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -832,7 +832,7 @@
skb->h.raw = skb->nh.raw;
skb->nh.raw = skb_push(skb, gre_hlen);
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
- IPCB(skb)->flags &= ~IPSKB_XFRM_TUNNEL_SIZE;
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE|IPSKB_XFRM_TRANSFORMED);
dst_release(skb->dst);
skb->dst = &rt->u.dst;
diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c
index 078b59b..bbd85f5 100644
--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -621,7 +621,7 @@
skb->h.raw = skb->nh.raw;
skb->nh.raw = skb_push(skb, sizeof(struct iphdr));
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
- IPCB(skb)->flags &= ~IPSKB_XFRM_TUNNEL_SIZE;
+ IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE|IPSKB_XFRM_TRANSFORMED);
dst_release(skb->dst);
skb->dst = &rt->u.dst;
diff --git a/net/ipv4/netfilter.c b/net/ipv4/netfilter.c
index ae0779d..4c637a1 100644
--- a/net/ipv4/netfilter.c
+++ b/net/ipv4/netfilter.c
@@ -7,11 +7,13 @@
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
+#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmp.h>
#include <net/route.h>
-#include <linux/ip.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
int ip_route_me_harder(struct sk_buff **pskb)
@@ -33,7 +35,6 @@
#ifdef CONFIG_IP_ROUTE_FWMARK
fl.nl_u.ip4_u.fwmark = (*pskb)->nfmark;
#endif
- fl.proto = iph->protocol;
if (ip_route_output_key(&rt, &fl) != 0)
return -1;
@@ -60,6 +61,13 @@
if ((*pskb)->dst->error)
return -1;
+#ifdef CONFIG_XFRM
+ if (!(IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED) &&
+ xfrm_decode_session(*pskb, &fl, AF_INET) == 0)
+ if (xfrm_lookup(&(*pskb)->dst, &fl, (*pskb)->sk, 0))
+ return -1;
+#endif
+
/* Change in oif may mean change in hh_len. */
hh_len = (*pskb)->dst->dev->hard_header_len;
if (skb_headroom(*pskb) < hh_len) {
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 51fabb8..160c488 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -140,6 +140,7 @@
x = dst->xfrm;
} while (x && !x->props.mode);
+ IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
err = 0;
out_exit:
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index f8626eb..b636783 100644
--- a/net/ipv6/netfilter.c
+++ b/net/ipv6/netfilter.c
@@ -10,6 +10,7 @@
#include <net/dst.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
+#include <net/xfrm.h>
int ip6_route_me_harder(struct sk_buff *skb)
{
@@ -21,11 +22,17 @@
{ .ip6_u =
{ .daddr = iph->daddr,
.saddr = iph->saddr, } },
- .proto = iph->nexthdr,
};
dst = ip6_route_output(skb->sk, &fl);
+#ifdef CONFIG_XFRM
+ if (!(IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED) &&
+ xfrm_decode_session(skb, &fl, AF_INET6) == 0)
+ if (xfrm_lookup(&skb->dst, &fl, skb->sk, 0))
+ return -1;
+#endif
+
if (dst->error) {
IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
LIMIT_NETDEBUG(KERN_DEBUG "ip6_route_me_harder: No more route.\n");
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index fc0ea38..8024217 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -139,6 +139,7 @@
x = dst->xfrm;
} while (x && !x->props.mode);
+ IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
err = 0;
out_exit:
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 64a4473..f2edc92 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -951,8 +951,8 @@
return start;
}
-static int
-_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
+int
+xfrm_decode_session(struct sk_buff *skb, struct flowi *fl, unsigned short family)
{
struct xfrm_policy_afinfo *afinfo = xfrm_policy_get_afinfo(family);
@@ -963,6 +963,7 @@
xfrm_policy_put_afinfo(afinfo);
return 0;
}
+EXPORT_SYMBOL(xfrm_decode_session);
static inline int secpath_has_tunnel(struct sec_path *sp, int k)
{
@@ -982,7 +983,7 @@
u8 fl_dir = policy_to_flow_dir(dir);
u32 sk_sid;
- if (_decode_session(skb, &fl, family) < 0)
+ if (xfrm_decode_session(skb, &fl, family) < 0)
return 0;
sk_sid = security_sk_sid(sk, &fl, fl_dir);
@@ -1055,7 +1056,7 @@
{
struct flowi fl;
- if (_decode_session(skb, &fl, family) < 0)
+ if (xfrm_decode_session(skb, &fl, family) < 0)
return 0;
return xfrm_lookup(&skb->dst, &fl, NULL, 0) == 0;
