[IPSEC]: Add AF_KEY interface for encapsulation family.

Signed-off-by: Miika Komu <miika@iki.fi>
Signed-off-by: Diego Beltrami <Diego.Beltrami@hiit.fi>
Signed-off-by: Kazunori Miyazawa <miyazawa@linux-ipv6.org>

1 files changed, 25 insertions, 15 deletions

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 4e1830999482..0e1dbfbb9b10 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -1767,11 +1767,11 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
 
         /* addresses present only in tunnel mode */
         if (t->mode == XFRM_MODE_TUNNEL) {
-                switch (xp->family) {
+                struct sockaddr *sa;
+                sa = (struct sockaddr *)(rq+1);
+                switch(sa->sa_family) {
                 case AF_INET:
-                        sin = (void*)(rq+1);
-                        if (sin->sin_family != AF_INET)
-                                return -EINVAL;
+                        sin = (struct sockaddr_in*)sa;
                         t->saddr.a4 = sin->sin_addr.s_addr;
                         sin++;
                         if (sin->sin_family != AF_INET)
@@ -1780,9 +1780,7 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
                         break;
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
                 case AF_INET6:
-                        sin6 = (void *)(rq+1);
-                        if (sin6->sin6_family != AF_INET6)
-                                return -EINVAL;
+                        sin6 = (struct sockaddr_in6*)sa;
                         memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
                         sin6++;
                         if (sin6->sin6_family != AF_INET6)
@@ -1793,7 +1791,10 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
                 default:
                         return -EINVAL;
                 }
-        }
+                t->encap_family = sa->sa_family;
+        } else
+                t->encap_family = xp->family;
+
         /* No way to set this via kame pfkey */
         t->aalgos = t->ealgos = t->calgos = ~0;
         xp->xfrm_nr++;
@@ -1830,18 +1831,25 @@ static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
 
 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
 {
+        struct xfrm_tmpl *t;
         int sockaddr_size = pfkey_sockaddr_size(xp->family);
-        int socklen = (xp->family == AF_INET ?
-                       sizeof(struct sockaddr_in) :
-                       sizeof(struct sockaddr_in6));
+        int socklen = 0;
+        int i;
+
+        for (i=0; i<xp->xfrm_nr; i++) {
+                t = xp->xfrm_vec + i;
+                socklen += (t->encap_family == AF_INET ?
+                            sizeof(struct sockaddr_in) :
+                            sizeof(struct sockaddr_in6));
+        }
 
         return sizeof(struct sadb_msg) +
                 (sizeof(struct sadb_lifetime) * 3) +
                 (sizeof(struct sadb_address) * 2) + 
                 (sockaddr_size * 2) +
                 sizeof(struct sadb_x_policy) +
-                (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
-                                (socklen * 2))) +
+                (xp->xfrm_nr * sizeof(struct sadb_x_ipsecrequest)) +
+                (socklen * 2) +
                 pfkey_xfrm_policy2sec_ctx_size(xp);
 }
 
@@ -1999,7 +2007,9 @@ static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, i
 
                 req_size = sizeof(struct sadb_x_ipsecrequest);
                 if (t->mode == XFRM_MODE_TUNNEL)
-                        req_size += 2*socklen;
+                        req_size += ((t->encap_family == AF_INET ?
+                                     sizeof(struct sockaddr_in) :
+                                     sizeof(struct sockaddr_in6)) * 2);
                 else
                         size -= 2*socklen;
                 rq = (void*)skb_put(skb, req_size);
@@ -2015,7 +2025,7 @@ static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, i
                         rq->sadb_x_ipsecrequest_level = IPSEC_LEVEL_USE;
                 rq->sadb_x_ipsecrequest_reqid = t->reqid;
                 if (t->mode == XFRM_MODE_TUNNEL) {
-                        switch (xp->family) {
+                        switch (t->encap_family) {
                         case AF_INET:
                                 sin = (void*)(rq+1);
                                 sin->sin_family = AF_INET;