Fedora kernel-2.6.17-1.2142_FC4 patched with stable patch-2.6.17.4-vs2.0.2-rc26.diff

[linux-2.6.git] / net / ipv4 / xfrm4_input.c

diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index 2d3849c..3e174c8 100644 (file)
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -11,6 +11,8 @@
 
 #include <linux/module.h>
 #include <linux/string.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter_ipv4.h>
 #include <net/inet_ecn.h>
 #include <net/ip.h>
 #include <net/xfrm.h>
@@ -35,8 +37,6 @@ static int xfrm4_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq)
 {
        switch (nexthdr) {
        case IPPROTO_IPIP:
-               if (!pskb_may_pull(skb, sizeof(struct iphdr)))
-                       return -EINVAL;
                *spi = skb->nh.iph->saddr;
                *seq = 0;
                return 0;
@@ -45,11 +45,28 @@ static int xfrm4_parse_spi(struct sk_buff *skb, u8 nexthdr, u32 *spi, u32 *seq)
        return xfrm_parse_spi(skb, nexthdr, spi, seq);
 }
 
+#ifdef CONFIG_NETFILTER
+static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)
+{
+       struct iphdr *iph = skb->nh.iph;
+
+       if (skb->dst == NULL) {
+               if (ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
+                                  skb->dev))
+                       goto drop;
+       }
+       return dst_input(skb);
+drop:
+       kfree_skb(skb);
+       return NET_RX_DROP;
+}
+#endif
+
 int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 {
        int err;
        u32 spi, seq;
-       struct sec_decap_state xfrm_vec[XFRM_MAX_DEPTH];
+       struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
        struct xfrm_state *x;
        int xfrm_nr = 0;
        int decaps = 0;
@@ -71,14 +88,16 @@ int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
                if (unlikely(x->km.state != XFRM_STATE_VALID))
                        goto drop_unlock;
 
+               if ((x->encap ? x->encap->encap_type : 0) != encap_type)
+                       goto drop_unlock;
+
                if (x->props.replay_window && xfrm_replay_check(x, seq))
                        goto drop_unlock;
 
                if (xfrm_state_check_expire(x))
                        goto drop_unlock;
 
-               xfrm_vec[xfrm_nr].decap.decap_type = encap_type;
-               if (x->type->input(x, &(xfrm_vec[xfrm_nr].decap), skb))
+               if (x->type->input(x, skb))
                        goto drop_unlock;
 
                /* only the first xfrm gets the encap type */
@@ -92,7 +111,7 @@ int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
 
                spin_unlock(&x->lock);
 
-               xfrm_vec[xfrm_nr++].xvec = x;
+               xfrm_vec[xfrm_nr++] = x;
 
                iph = skb->nh.iph;
 
@@ -134,9 +153,12 @@ int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
        if (xfrm_nr + skb->sp->len > XFRM_MAX_DEPTH)
                goto drop;
 
-       memcpy(skb->sp->x+skb->sp->len, xfrm_vec, xfrm_nr*sizeof(struct sec_decap_state));
+       memcpy(skb->sp->xvec + skb->sp->len, xfrm_vec,
+              xfrm_nr * sizeof(xfrm_vec[0]));
        skb->sp->len += xfrm_nr;
 
+       nf_reset(skb);
+
        if (decaps) {
                if (!(skb->dev->flags&IFF_LOOPBACK)) {
                        dst_release(skb->dst);
@@ -145,7 +167,17 @@ int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
                netif_rx(skb);
                return 0;
        } else {
+#ifdef CONFIG_NETFILTER
+               __skb_push(skb, skb->data - skb->nh.raw);
+               skb->nh.iph->tot_len = htons(skb->len);
+               ip_send_check(skb->nh.iph);
+
+               NF_HOOK(PF_INET, NF_IP_PRE_ROUTING, skb, skb->dev, NULL,
+                       xfrm4_rcv_encap_finish);
+               return 0;
+#else
                return -skb->nh.iph->protocol;
+#endif
        }
 
 drop_unlock:
@@ -153,7 +185,7 @@ drop_unlock:
        xfrm_state_put(x);
 drop:
        while (--xfrm_nr >= 0)
-               xfrm_state_put(xfrm_vec[xfrm_nr].xvec);
+               xfrm_state_put(xfrm_vec[xfrm_nr]);
 
        kfree_skb(skb);
        return 0;