From 631a6698d09e57cadc069914d613899609a0ae83 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Wed, 10 Oct 2007 15:46:21 -0700
Subject: [PATCH] [IPSEC]: Move IP protocol setting from transforms into
xfrm4_input.c
This patch makes the IPv4 x->type->input functions return the next protocol
instead of setting it directly. This is identical to how we do things in
IPv6 and will help us merge common code on the input path.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
---
net/ipv4/ah4.c | 5 +++--
net/ipv4/esp4.c | 3 +--
net/ipv4/ipcomp.c | 7 ++++---
net/ipv4/xfrm4_input.c | 7 ++++++-
net/ipv4/xfrm4_tunnel.c | 2 +-
5 files changed, 15 insertions(+), 9 deletions(-)
diff --git a/net/ipv4/ah4.c b/net/ipv4/ah4.c
index 60925fedbf167..4e8e3b079f5b6 100644
--- a/net/ipv4/ah4.c
+++ b/net/ipv4/ah4.c
@@ -125,6 +125,7 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
{
int ah_hlen;
int ihl;
+ int nexthdr;
int err = -EINVAL;
struct iphdr *iph;
struct ip_auth_hdr *ah;
@@ -136,6 +137,7 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
ah = (struct ip_auth_hdr *)skb->data;
ahp = x->data;
+ nexthdr = ah->nexthdr;
ah_hlen = (ah->hdrlen + 2) << 2;
if (ah_hlen != XFRM_ALIGN8(sizeof(*ah) + ahp->icv_full_len) &&
@@ -182,13 +184,12 @@ static int ah_input(struct xfrm_state *x, struct sk_buff *skb)
goto out;
}
}
- ((struct iphdr*)work_buf)->protocol = ah->nexthdr;
skb->network_header += ah_hlen;
memcpy(skb_network_header(skb), work_buf, ihl);
skb->transport_header = skb->network_header;
__skb_pull(skb, ah_hlen + ihl);
- return 0;
+ return nexthdr;
out:
return err;
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 8377bedf3f665..6b1a31a74cf2a 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -257,12 +257,11 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
- iph->protocol = nexthdr[1];
pskb_trim(skb, skb->len - alen - padlen - 2);
__skb_pull(skb, sizeof(*esph) + esp->conf.ivlen);
skb_set_transport_header(skb, -ihl);
- return 0;
+ return nexthdr[1];
out:
return -EINVAL;
diff --git a/net/ipv4/ipcomp.c b/net/ipv4/ipcomp.c
index 32b02deca2ecb..0bfeb02a5f87b 100644
--- a/net/ipv4/ipcomp.c
+++ b/net/ipv4/ipcomp.c
@@ -75,7 +75,6 @@ out:
static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
{
int err = -ENOMEM;
- struct iphdr *iph;
struct ip_comp_hdr *ipch;
if (skb_linearize_cow(skb))
@@ -84,12 +83,14 @@ static int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
skb->ip_summed = CHECKSUM_NONE;
/* Remove ipcomp header and decompress original payload */
- iph = ip_hdr(skb);
ipch = (void *)skb->data;
- iph->protocol = ipch->nexthdr;
skb->transport_header = skb->network_header + sizeof(*ipch);
__skb_pull(skb, sizeof(*ipch));
err = ipcomp_decompress(x, skb);
+ if (err)
+ goto out;
+
+ err = ipch->nexthdr;
out:
return err;
diff --git a/net/ipv4/xfrm4_input.c b/net/ipv4/xfrm4_input.c
index 2fa108245413d..e9bbfde19ac32 100644
--- a/net/ipv4/xfrm4_input.c
+++ b/net/ipv4/xfrm4_input.c
@@ -54,12 +54,14 @@ static int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
int xfrm_nr = 0;
int decaps = 0;
int err = xfrm4_parse_spi(skb, ip_hdr(skb)->protocol, &spi, &seq);
+ unsigned int nhoff = offsetof(struct iphdr, protocol);
if (err != 0)
goto drop;
do {
const struct iphdr *iph = ip_hdr(skb);
+ int nexthdr;
if (xfrm_nr == XFRM_MAX_DEPTH)
goto drop;
@@ -82,9 +84,12 @@ static int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
if (xfrm_state_check_expire(x))
goto drop_unlock;
- if (x->type->input(x, skb))
+ nexthdr = x->type->input(x, skb);
+ if (nexthdr <= 0)
goto drop_unlock;
+ skb_network_header(skb)[nhoff] = nexthdr;
+
/* only the first xfrm gets the encap type */
encap_type = 0;
diff --git a/net/ipv4/xfrm4_tunnel.c b/net/ipv4/xfrm4_tunnel.c
index e1fafc1562d8e..1312417608e2a 100644
--- a/net/ipv4/xfrm4_tunnel.c
+++ b/net/ipv4/xfrm4_tunnel.c
@@ -18,7 +18,7 @@ static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
{
- return 0;
+ return IPPROTO_IP;
}
static int ipip_init_state(struct xfrm_state *x)
--
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