147 lines
3.0 KiB
C
147 lines
3.0 KiB
C
/*
|
|
* xfrm6_input.c: based on net/ipv4/xfrm4_input.c
|
|
*
|
|
* Authors:
|
|
* Mitsuru KANDA @USAGI
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
|
|
* YOSHIFUJI Hideaki @USAGI
|
|
* IPv6 support
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/netfilter_ipv6.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/xfrm.h>
|
|
|
|
int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
{
|
|
return xfrm6_extract_header(skb);
|
|
}
|
|
|
|
int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
|
|
{
|
|
XFRM_SPI_SKB_CB(skb)->family = AF_INET6;
|
|
XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);
|
|
return xfrm_input(skb, nexthdr, spi, 0);
|
|
}
|
|
EXPORT_SYMBOL(xfrm6_rcv_spi);
|
|
|
|
int xfrm6_transport_finish(struct sk_buff *skb, int async)
|
|
{
|
|
skb_network_header(skb)[IP6CB(skb)->nhoff] =
|
|
XFRM_MODE_SKB_CB(skb)->protocol;
|
|
|
|
#ifndef CONFIG_NETFILTER
|
|
if (!async)
|
|
return 1;
|
|
#endif
|
|
|
|
ipv6_hdr(skb)->payload_len = htons(skb->len);
|
|
__skb_push(skb, skb->data - skb_network_header(skb));
|
|
|
|
NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING, skb, skb->dev, NULL,
|
|
ip6_rcv_finish);
|
|
return -1;
|
|
}
|
|
|
|
int xfrm6_rcv(struct sk_buff *skb)
|
|
{
|
|
return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],
|
|
0);
|
|
}
|
|
|
|
EXPORT_SYMBOL(xfrm6_rcv);
|
|
|
|
int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
|
|
xfrm_address_t *saddr, u8 proto)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
struct xfrm_state *x = NULL;
|
|
int i = 0;
|
|
|
|
/* Allocate new secpath or COW existing one. */
|
|
if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
|
|
struct sec_path *sp;
|
|
|
|
sp = secpath_dup(skb->sp);
|
|
if (!sp) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
|
|
goto drop;
|
|
}
|
|
if (skb->sp)
|
|
secpath_put(skb->sp);
|
|
skb->sp = sp;
|
|
}
|
|
|
|
if (1 + skb->sp->len == XFRM_MAX_DEPTH) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
|
|
goto drop;
|
|
}
|
|
|
|
for (i = 0; i < 3; i++) {
|
|
xfrm_address_t *dst, *src;
|
|
|
|
switch (i) {
|
|
case 0:
|
|
dst = daddr;
|
|
src = saddr;
|
|
break;
|
|
case 1:
|
|
/* lookup state with wild-card source address */
|
|
dst = daddr;
|
|
src = (xfrm_address_t *)&in6addr_any;
|
|
break;
|
|
default:
|
|
/* lookup state with wild-card addresses */
|
|
dst = (xfrm_address_t *)&in6addr_any;
|
|
src = (xfrm_address_t *)&in6addr_any;
|
|
break;
|
|
}
|
|
|
|
x = xfrm_state_lookup_byaddr(net, skb->mark, dst, src, proto, AF_INET6);
|
|
if (!x)
|
|
continue;
|
|
|
|
spin_lock(&x->lock);
|
|
|
|
if ((!i || (x->props.flags & XFRM_STATE_WILDRECV)) &&
|
|
likely(x->km.state == XFRM_STATE_VALID) &&
|
|
!xfrm_state_check_expire(x)) {
|
|
spin_unlock(&x->lock);
|
|
if (x->type->input(x, skb) > 0) {
|
|
/* found a valid state */
|
|
break;
|
|
}
|
|
} else
|
|
spin_unlock(&x->lock);
|
|
|
|
xfrm_state_put(x);
|
|
x = NULL;
|
|
}
|
|
|
|
if (!x) {
|
|
XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
|
|
xfrm_audit_state_notfound_simple(skb, AF_INET6);
|
|
goto drop;
|
|
}
|
|
|
|
skb->sp->xvec[skb->sp->len++] = x;
|
|
|
|
spin_lock(&x->lock);
|
|
|
|
x->curlft.bytes += skb->len;
|
|
x->curlft.packets++;
|
|
|
|
spin_unlock(&x->lock);
|
|
|
|
return 1;
|
|
|
|
drop:
|
|
return -1;
|
|
}
|
|
|
|
EXPORT_SYMBOL(xfrm6_input_addr);
|