diff options
| author |   Patrick McHardy <kaber@trash.net> | 2006-01-06 23:03:34 -0800 |
|---|---|---|
| committer |   David S. Miller <davem@sunset.davemloft.net> | 2006-01-07 12:57:31 -0800 |
| commit | b05e106698d9966de524e78d9da1bf6407fe0c32 (patch) | |
| tree | 8a7c253b7249451941674805cccdaaba299dff6f /net/ipv4/xfrm4_input.c | |
| parent | [IPV6]: Move nextheader offset to the IP6CB (diff) | |
| download | linux-dev-b05e106698d9966de524e78d9da1bf6407fe0c32.tar.xz linux-dev-b05e106698d9966de524e78d9da1bf6407fe0c32.zip | |
[IPV4/6]: Netfilter IPsec input hooks
When the innermost transform uses transport mode the decapsulated packet
is not visible to netfilter. Pass the packet through the PRE_ROUTING and
LOCAL_IN hooks again before handing it to upper layer protocols to make
netfilter-visibility symetrical to the output path.
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_input.c')
| -rw-r--r-- | net/ipv4/xfrm4_input.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c index 2d3849c38a0f..850d919591d1 100644 --- 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> @@ -45,6 +47,23 @@ 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; @@ -137,6 +156,8 @@ int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type) memcpy(skb->sp->x+skb->sp->len, xfrm_vec, xfrm_nr*sizeof(struct sec_decap_state)); skb->sp->len += xfrm_nr; + nf_reset(skb); + if (decaps) { if (!(skb->dev->flags&IFF_LOOPBACK)) { dst_release(skb->dst); @@ -145,7 +166,17 @@ 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: |