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

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>

diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 66343d3..a7c9e4c 100644 (file)
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -256,6 +256,7 @@ struct xfrm_usersa_info {
 #define XFRM_STATE_NOECN       1
 #define XFRM_STATE_DECAP_DSCP  2
 #define XFRM_STATE_NOPMTUDISC  4
+#define XFRM_STATE_WILDRECV    8
 };
 
 struct xfrm_usersa_id {

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index eed48f8..0d735a5 100644 (file)
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -955,6 +955,8 @@ extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler);
 extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler);
 extern int xfrm6_rcv_spi(struct sk_buff *skb, u32 spi);
 extern int xfrm6_rcv(struct sk_buff **pskb);
+extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
+                           xfrm_address_t *saddr, u8 proto);
 extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler);
 extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler);
 extern u32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);

diff --git a/net/ipv6/ipv6_syms.c b/net/ipv6/ipv6_syms.c
index e1a7416..7b7b90d 100644 (file)
--- a/net/ipv6/ipv6_syms.c
+++ b/net/ipv6/ipv6_syms.c
@@ -31,6 +31,7 @@ EXPORT_SYMBOL(ipv6_chk_addr);
 EXPORT_SYMBOL(in6_dev_finish_destroy);
 #ifdef CONFIG_XFRM
 EXPORT_SYMBOL(xfrm6_rcv);
+EXPORT_SYMBOL(xfrm6_input_addr);
 EXPORT_SYMBOL(xfrm6_find_1stfragopt);
 #endif
 EXPORT_SYMBOL(rt6_lookup);

diff --git a/net/ipv6/xfrm6_input.c b/net/ipv6/xfrm6_input.c
index ee2f6b3..a40a057 100644 (file)
--- a/net/ipv6/xfrm6_input.c
+++ b/net/ipv6/xfrm6_input.c
@@ -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;
+}

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 11f480b..f053715 100644 (file)
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -352,6 +352,7 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
        list_for_each_entry(x, xfrm_state_bydst+h, bydst) {
                if (x->props.family == family &&
                    x->props.reqid == tmpl->reqid &&
+                   !(x->props.flags & XFRM_STATE_WILDRECV) &&
                    xfrm_state_addr_check(x, daddr, saddr, family) &&
                    tmpl->mode == x->props.mode &&
                    tmpl->id.proto == x->id.proto &&