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[XFRM] STATE: Common receive function for route optimization extension headers.

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XFRM_STATE_WILDRECV flag is introduced; the last resort state is set
it and receives packet which is not route optimized but uses such
extension headers i.e. Mobile IPv6 signaling (binding update and
acknowledgement).  A node enabled Mobile IPv6 adds the state.

Based on MIPL2 kernel patch.

Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Masahide NAKAMURA 2006-08-23 18:08:21 -07:00 • committed by David S. Miller
parent f3bd484021
commit fbd9a5b47e
5 changed files with 113 additions and 0 deletions
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108
net/ipv6/xfrm6_input.c
View file

@ -138,3 +138,111 @@ int xfrm6_rcv(struct sk_buff **pskb)
{
return xfrm6_rcv_spi(*pskb, 0);
}
int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
xfrm_address_t *saddr, u8 proto)
{
struct xfrm_state *x = NULL;
int wildcard = 0;
struct in6_addr any;
xfrm_address_t *xany;
struct xfrm_state *xfrm_vec_one = NULL;
int nh = 0;
int i = 0;
ipv6_addr_set(&any, 0, 0, 0, 0);
xany = (xfrm_address_t *)&any;
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 */
wildcard = 1;
dst = daddr;
src = xany;
break;
case 2:
default:
/* lookup state with wild-card addresses */
wildcard = 1; /* XXX */
dst = xany;
src = xany;
break;
}
x = xfrm_state_lookup_byaddr(dst, src, proto, AF_INET6);
if (!x)
continue;
spin_lock(&x->lock);
if (wildcard) {
if ((x->props.flags & XFRM_STATE_WILDRECV) == 0) {
spin_unlock(&x->lock);
xfrm_state_put(x);
x = NULL;
continue;
}
}
if (unlikely(x->km.state != XFRM_STATE_VALID)) {
spin_unlock(&x->lock);
xfrm_state_put(x);
x = NULL;
continue;
}
if (xfrm_state_check_expire(x)) {
spin_unlock(&x->lock);
xfrm_state_put(x);
x = NULL;
continue;
}
nh = x->type->input(x, skb);
if (nh <= 0) {
spin_unlock(&x->lock);
xfrm_state_put(x);
x = NULL;
continue;
}
x->curlft.bytes += skb->len;
x->curlft.packets++;
spin_unlock(&x->lock);
xfrm_vec_one = x;
break;
}
if (!xfrm_vec_one)
goto drop;
/* 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)
goto drop;
if (skb->sp)
secpath_put(skb->sp);
skb->sp = sp;
}
if (1 + skb->sp->len > XFRM_MAX_DEPTH)
goto drop;
skb->sp->xvec[skb->sp->len] = xfrm_vec_one;
skb->sp->len ++;
return 1;
drop:
if (xfrm_vec_one)
xfrm_state_put(xfrm_vec_one);
return -1;
}