key: Share common code path to extract address from sockaddr{}.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 38 insertions, 69 deletions

diff --git a/net/key/af_key.c b/net/key/af_key.c
index 2b05cb6c15c6..771bd61d6303 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -592,25 +592,30 @@ static inline int pfkey_sockaddr_len(sa_family_t family)
         return 0;
 }
 
-static int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr,
-                                     xfrm_address_t *xaddr)
+static
+int pfkey_sockaddr_extract(const struct sockaddr *sa, xfrm_address_t *xaddr)
 {
-        switch (((struct sockaddr*)(addr + 1))->sa_family) {
+        switch (sa->sa_family) {
         case AF_INET:
                 xaddr->a4 =
-                        ((struct sockaddr_in *)(addr + 1))->sin_addr.s_addr;
+                        ((struct sockaddr_in *)sa)->sin_addr.s_addr;
                 return AF_INET;
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
         case AF_INET6:
                 memcpy(xaddr->a6,
-                       &((struct sockaddr_in6 *)(addr + 1))->sin6_addr,
+                       &((struct sockaddr_in6 *)sa)->sin6_addr,
                        sizeof(struct in6_addr));
                 return AF_INET6;
 #endif
-        default:
-                return 0;
         }
-        /* NOTREACHED */
+        return 0;
+}
+
+static
+int pfkey_sadb_addr2xfrm_addr(struct sadb_address *addr, xfrm_address_t *xaddr)
+{
+        return pfkey_sockaddr_extract((struct sockaddr *)(addr + 1),
+                                      xaddr);
 }
 
 static struct  xfrm_state *pfkey_xfrm_state_lookup(struct sadb_msg *hdr, void **ext_hdrs)
@@ -1828,10 +1833,6 @@ static int
 parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
 {
         struct xfrm_tmpl *t = xp->xfrm_vec + xp->xfrm_nr;
-        struct sockaddr_in *sin;
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-        struct sockaddr_in6 *sin6;
-#endif
         int mode;
 
         if (xp->xfrm_nr >= XFRM_MAX_DEPTH)
@@ -1856,31 +1857,19 @@ parse_ipsecrequest(struct xfrm_policy *xp, struct sadb_x_ipsecrequest *rq)
 
         /* addresses present only in tunnel mode */
         if (t->mode == XFRM_MODE_TUNNEL) {
-                struct sockaddr *sa;
-                sa = (struct sockaddr *)(rq+1);
-                switch(sa->sa_family) {
-                case AF_INET:
-                        sin = (struct sockaddr_in*)sa;
-                        t->saddr.a4 = sin->sin_addr.s_addr;
-                        sin++;
-                        if (sin->sin_family != AF_INET)
-                                return -EINVAL;
-                        t->id.daddr.a4 = sin->sin_addr.s_addr;
-                        break;
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-                case AF_INET6:
-                        sin6 = (struct sockaddr_in6*)sa;
-                        memcpy(t->saddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
-                        sin6++;
-                        if (sin6->sin6_family != AF_INET6)
-                                return -EINVAL;
-                        memcpy(t->id.daddr.a6, &sin6->sin6_addr, sizeof(struct in6_addr));
-                        break;
-#endif
-                default:
+                u8 *sa = (u8 *) (rq + 1);
+                int family, socklen;
+
+                family = pfkey_sockaddr_extract((struct sockaddr *)sa,
+                                                &t->saddr);
+                if (!family)
                         return -EINVAL;
-                }
-                t->encap_family = sa->sa_family;
+
+                socklen = pfkey_sockaddr_len(family);
+                if (pfkey_sockaddr_extract((struct sockaddr *)(sa + socklen),
+                                           &t->id.daddr) != family)
+                        return -EINVAL;
+                t->encap_family = family;
         } else
                 t->encap_family = xp->family;
 
@@ -2375,44 +2364,24 @@ static int parse_sockaddr_pair(struct sadb_x_ipsecrequest *rq,
                                xfrm_address_t *saddr, xfrm_address_t *daddr,
                                u16 *family)
 {
-        struct sockaddr *sa = (struct sockaddr *)(rq + 1);
+        u8 *sa = (u8 *) (rq + 1);
+        int af, socklen;
+
         if (rq->sadb_x_ipsecrequest_len <
-            pfkey_sockaddr_pair_size(sa->sa_family))
+            pfkey_sockaddr_pair_size(((struct sockaddr *)sa)->sa_family))
                 return -EINVAL;
 
-        switch (sa->sa_family) {
-        case AF_INET:
-                {
-                        struct sockaddr_in *sin;
-                        sin = (struct sockaddr_in *)sa;
-                        if ((sin+1)->sin_family != AF_INET)
-                                return -EINVAL;
-                        memcpy(&saddr->a4, &sin->sin_addr, sizeof(saddr->a4));
-                        sin++;
-                        memcpy(&daddr->a4, &sin->sin_addr, sizeof(daddr->a4));
-                        *family = AF_INET;
-                        break;
-                }
-#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
-        case AF_INET6:
-                {
-                        struct sockaddr_in6 *sin6;
-                        sin6 = (struct sockaddr_in6 *)sa;
-                        if ((sin6+1)->sin6_family != AF_INET6)
-                                return -EINVAL;
-                        memcpy(&saddr->a6, &sin6->sin6_addr,
-                               sizeof(saddr->a6));
-                        sin6++;
-                        memcpy(&daddr->a6, &sin6->sin6_addr,
-                               sizeof(daddr->a6));
-                        *family = AF_INET6;
-                        break;
-                }
-#endif
-        default:
+        af = pfkey_sockaddr_extract((struct sockaddr *) sa,
+                                    saddr);
+        if (!af)
+                return -EINVAL;
+
+        socklen = pfkey_sockaddr_len(af);
+        if (pfkey_sockaddr_extract((struct sockaddr *) (sa + socklen),
+                                   daddr) != af)
                 return -EINVAL;
-        }
 
+        *family = af;
         return 0;
 }