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[IPSEC]: Move tunnel parsing for IPv4 out of xfrm4_input 

This patch moves the tunnel parsing for IPv4 out of xfrm4_input and into
xfrm4_tunnel.  This change is in line with what IPv6 does and will allow
us to merge the two input functions.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2007-10-17 21:28:53 -07:00 committed by David S. Miller
parent 04663d0b8b
commit c4541b41c0
3 changed files with 26 additions and 27 deletions
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8
include/net/xfrm.h
View File

@ -1046,7 +1046,15 @@ extern void xfrm_replay_notify(struct xfrm_state *x, int event);
extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
extern int xfrm_init_state(struct xfrm_state *x);
extern int xfrm_output(struct sk_buff *skb);
extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
int encap_type);
extern int xfrm4_rcv(struct sk_buff *skb);
static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
{
return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
}
extern int xfrm4_output(struct sk_buff *skb);
extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);

36
net/ipv4/xfrm4_input.c
View File

@ -16,19 +16,6 @@
#include <net/ip.h>
#include <net/xfrm.h>
static int xfrm4_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
{
switch (nexthdr) {
case IPPROTO_IPIP:
case IPPROTO_IPV6:
*spi = ip_hdr(skb)->saddr;
*seq = 0;
return 0;
}
return xfrm_parse_spi(skb, nexthdr, spi, seq);
}
#ifdef CONFIG_NETFILTER
static inline int xfrm4_rcv_encap_finish(struct sk_buff *skb)
{
@ -46,28 +33,29 @@ drop:
}
#endif
static int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
int encap_type)
{
__be32 spi, seq;
int err;
__be32 seq;
struct xfrm_state *xfrm_vec[XFRM_MAX_DEPTH];
struct xfrm_state *x;
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)
seq = 0;
if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0)
goto drop;
do {
const struct iphdr *iph = ip_hdr(skb);
int nexthdr;
if (xfrm_nr == XFRM_MAX_DEPTH)
goto drop;
x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, spi,
iph->protocol != IPPROTO_IPV6 ? iph->protocol : IPPROTO_IPIP, AF_INET);
nexthdr, AF_INET);
if (x == NULL)
goto drop;
@ -111,7 +99,7 @@ static int xfrm4_rcv_encap(struct sk_buff *skb, __u16 encap_type)
break;
}
err = xfrm_parse_spi(skb, ip_hdr(skb)->protocol, &spi, &seq);
err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
if (err < 0)
goto drop;
} while (!err);
@ -165,6 +153,7 @@ drop:
kfree_skb(skb);
return 0;
}
EXPORT_SYMBOL(xfrm4_rcv_encap);
/* If it's a keepalive packet, then just eat it.
* If it's an encapsulated packet, then pass it to the
@ -252,11 +241,8 @@ int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
__skb_pull(skb, len);
skb_reset_transport_header(skb);
/* modify the protocol (it's ESP!) */
iph->protocol = IPPROTO_ESP;
/* process ESP */
ret = xfrm4_rcv_encap(skb, encap_type);
ret = xfrm4_rcv_encap(skb, IPPROTO_ESP, 0, encap_type);
return ret;
drop:
@ -266,7 +252,7 @@ drop:
int xfrm4_rcv(struct sk_buff *skb)
{
return xfrm4_rcv_encap(skb, 0);
return xfrm4_rcv_spi(skb, ip_hdr(skb)->protocol, 0);
}
EXPORT_SYMBOL(xfrm4_rcv);

9
net/ipv4/xfrm4_tunnel.c
View File

@ -48,20 +48,25 @@ static struct xfrm_type ipip_type = {
.output = ipip_output
};
static int xfrm_tunnel_rcv(struct sk_buff *skb)
{
return xfrm4_rcv_spi(skb, IPPROTO_IP, ip_hdr(skb)->saddr);
}
static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
{
return -ENOENT;
}
static struct xfrm_tunnel xfrm_tunnel_handler = {
.handler = xfrm4_rcv,
.handler = xfrm_tunnel_rcv,
.err_handler = xfrm_tunnel_err,
.priority = 2,
};
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static struct xfrm_tunnel xfrm64_tunnel_handler = {
.handler = xfrm4_rcv,
.handler = xfrm_tunnel_rcv,
.err_handler = xfrm_tunnel_err,
.priority = 2,
};