[XFRM] STATE: Search by address using source address list.

This is a support to search transformation states by its addresses
by using source address list for Mobile IPv6 usage.
To use it from user-space, it is also added a message type for
source address as a xfrm state option.
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>

1 files changed, 33 insertions, 4 deletions

diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 2a9992894e69..11f480b12952 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -487,6 +487,16 @@ void xfrm_state_insert(struct xfrm_state *x)
 }
 EXPORT_SYMBOL(xfrm_state_insert);
 
+static inline struct xfrm_state *
+__xfrm_state_locate(struct xfrm_state_afinfo *afinfo, struct xfrm_state *x,
+                    int use_spi)
+{
+        if (use_spi)
+                return afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+        else
+                return afinfo->state_lookup_byaddr(&x->id.daddr, &x->props.saddr, x->id.proto);
+}
+
 static struct xfrm_state *__xfrm_find_acq_byseq(u32 seq);
 
 int xfrm_state_add(struct xfrm_state *x)
@@ -495,6 +505,7 @@ int xfrm_state_add(struct xfrm_state *x)
         struct xfrm_state *x1;
         int family;
         int err;
+        int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
 
         family = x->props.family;
         afinfo = xfrm_state_get_afinfo(family);
@@ -503,7 +514,7 @@ int xfrm_state_add(struct xfrm_state *x)
 
         spin_lock_bh(&xfrm_state_lock);
 
-        x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+        x1 = __xfrm_state_locate(afinfo, x, use_spi);
         if (x1) {
                 xfrm_state_put(x1);
                 x1 = NULL;
@@ -511,7 +522,7 @@ int xfrm_state_add(struct xfrm_state *x)
                 goto out;
         }
 
-        if (x->km.seq) {
+        if (use_spi && x->km.seq) {
                 x1 = __xfrm_find_acq_byseq(x->km.seq);
                 if (x1 && xfrm_addr_cmp(&x1->id.daddr, &x->id.daddr, family)) {
                         xfrm_state_put(x1);
@@ -519,7 +530,7 @@ int xfrm_state_add(struct xfrm_state *x)
                 }
         }
 
-        if (!x1)
+        if (use_spi && !x1)
                 x1 = afinfo->find_acq(
                         x->props.mode, x->props.reqid, x->id.proto,
                         &x->id.daddr, &x->props.saddr, 0);
@@ -548,13 +559,14 @@ int xfrm_state_update(struct xfrm_state *x)
         struct xfrm_state_afinfo *afinfo;
         struct xfrm_state *x1;
         int err;
+        int use_spi = xfrm_id_proto_match(x->id.proto, IPSEC_PROTO_ANY);
 
         afinfo = xfrm_state_get_afinfo(x->props.family);
         if (unlikely(afinfo == NULL))
                 return -EAFNOSUPPORT;
 
         spin_lock_bh(&xfrm_state_lock);
-        x1 = afinfo->state_lookup(&x->id.daddr, x->id.spi, x->id.proto);
+        x1 = __xfrm_state_locate(afinfo, x, use_spi);
 
         err = -ESRCH;
         if (!x1)
@@ -675,6 +687,23 @@ xfrm_state_lookup(xfrm_address_t *daddr, u32 spi, u8 proto,
 EXPORT_SYMBOL(xfrm_state_lookup);
 
 struct xfrm_state *
+xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr,
+                         u8 proto, unsigned short family)
+{
+        struct xfrm_state *x;
+        struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
+        if (!afinfo)
+                return NULL;
+
+        spin_lock_bh(&xfrm_state_lock);
+        x = afinfo->state_lookup_byaddr(daddr, saddr, proto);
+        spin_unlock_bh(&xfrm_state_lock);
+        xfrm_state_put_afinfo(afinfo);
+        return x;
+}
+EXPORT_SYMBOL(xfrm_state_lookup_byaddr);
+
+struct xfrm_state *
 xfrm_find_acq(u8 mode, u32 reqid, u8 proto, 
               xfrm_address_t *daddr, xfrm_address_t *saddr, 
               int create, unsigned short family)