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-rw-r--r--include/net/ip6_route.h12
-rw-r--r--include/net/ipv6.h3
-rw-r--r--net/dccp/ipv6.c4
-rw-r--r--net/ipv6/af_inet6.c2
-rw-r--r--net/ipv6/inet6_connection_sock.c2
-rw-r--r--net/ipv6/ip6_output.c120
-rw-r--r--net/ipv6/tcp_ipv6.c4
-rw-r--r--net/ipv6/udp.c2
8 files changed, 100 insertions, 49 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h
index ab29dafb1a6a..96b0e66406ec 100644
--- a/include/net/ip6_route.h
+++ b/include/net/ip6_route.h
@@ -139,16 +139,22 @@ extern rwlock_t rt6_lock;
/*
* Store a destination cache entry in a socket
*/
-static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
- struct in6_addr *daddr)
+static inline void __ip6_dst_store(struct sock *sk, struct dst_entry *dst,
+ struct in6_addr *daddr)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct rt6_info *rt = (struct rt6_info *) dst;
- write_lock(&sk->sk_dst_lock);
sk_setup_caps(sk, dst);
np->daddr_cache = daddr;
np->dst_cookie = rt->rt6i_node ? rt->rt6i_node->fn_sernum : 0;
+}
+
+static inline void ip6_dst_store(struct sock *sk, struct dst_entry *dst,
+ struct in6_addr *daddr)
+{
+ write_lock(&sk->sk_dst_lock);
+ __ip6_dst_store(sk, dst, daddr);
write_unlock(&sk->sk_dst_lock);
}
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index a8fdf7970b37..ece7e8a84ffd 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -468,6 +468,9 @@ extern void ip6_flush_pending_frames(struct sock *sk);
extern int ip6_dst_lookup(struct sock *sk,
struct dst_entry **dst,
struct flowi *fl);
+extern int ip6_sk_dst_lookup(struct sock *sk,
+ struct dst_entry **dst,
+ struct flowi *fl);
/*
* skb processing functions
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 9f3d4d7cd0bf..610c722ac27f 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -230,7 +230,7 @@ static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
ipv6_addr_copy(&np->saddr, saddr);
inet->rcv_saddr = LOOPBACK4_IPV6;
- ip6_dst_store(sk, dst, NULL);
+ __ip6_dst_store(sk, dst, NULL);
icsk->icsk_ext_hdr_len = 0;
if (np->opt != NULL)
@@ -863,7 +863,7 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
* comment in that function for the gory details. -acme
*/
- ip6_dst_store(newsk, dst, NULL);
+ __ip6_dst_store(newsk, dst, NULL);
newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
NETIF_F_TSO);
newdp6 = (struct dccp6_sock *)newsk;
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 5a0ba58b86cc..ac85e9c532c2 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -658,7 +658,7 @@ int inet6_sk_rebuild_header(struct sock *sk)
return err;
}
- ip6_dst_store(sk, dst, NULL);
+ __ip6_dst_store(sk, dst, NULL);
}
return 0;
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c
index 5c950cc79d80..bf491077b822 100644
--- a/net/ipv6/inet6_connection_sock.c
+++ b/net/ipv6/inet6_connection_sock.c
@@ -185,7 +185,7 @@ int inet6_csk_xmit(struct sk_buff *skb, int ipfragok)
return err;
}
- ip6_dst_store(sk, dst, NULL);
+ __ip6_dst_store(sk, dst, NULL);
}
skb->dst = dst_clone(dst);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 3bc74ce78800..5e74a37695f7 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -723,48 +723,51 @@ fail:
return err;
}
-int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
+static struct dst_entry *ip6_sk_dst_check(struct sock *sk,
+ struct dst_entry *dst,
+ struct flowi *fl)
{
- int err = 0;
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct rt6_info *rt = (struct rt6_info *)dst;
- *dst = NULL;
- if (sk) {
- struct ipv6_pinfo *np = inet6_sk(sk);
-
- *dst = sk_dst_check(sk, np->dst_cookie);
- if (*dst) {
- struct rt6_info *rt = (struct rt6_info*)*dst;
-
- /* Yes, checking route validity in not connected
- * case is not very simple. Take into account,
- * that we do not support routing by source, TOS,
- * and MSG_DONTROUTE --ANK (980726)
- *
- * 1. If route was host route, check that
- * cached destination is current.
- * If it is network route, we still may
- * check its validity using saved pointer
- * to the last used address: daddr_cache.
- * We do not want to save whole address now,
- * (because main consumer of this service
- * is tcp, which has not this problem),
- * so that the last trick works only on connected
- * sockets.
- * 2. oif also should be the same.
- */
- if (((rt->rt6i_dst.plen != 128 ||
- !ipv6_addr_equal(&fl->fl6_dst,
- &rt->rt6i_dst.addr))
- && (np->daddr_cache == NULL ||
- !ipv6_addr_equal(&fl->fl6_dst,
- np->daddr_cache)))
- || (fl->oif && fl->oif != (*dst)->dev->ifindex)) {
- dst_release(*dst);
- *dst = NULL;
- }
- }
+ if (!dst)
+ goto out;
+
+ /* Yes, checking route validity in not connected
+ * case is not very simple. Take into account,
+ * that we do not support routing by source, TOS,
+ * and MSG_DONTROUTE --ANK (980726)
+ *
+ * 1. If route was host route, check that
+ * cached destination is current.
+ * If it is network route, we still may
+ * check its validity using saved pointer
+ * to the last used address: daddr_cache.
+ * We do not want to save whole address now,
+ * (because main consumer of this service
+ * is tcp, which has not this problem),
+ * so that the last trick works only on connected
+ * sockets.
+ * 2. oif also should be the same.
+ */
+ if (((rt->rt6i_dst.plen != 128 ||
+ !ipv6_addr_equal(&fl->fl6_dst, &rt->rt6i_dst.addr))
+ && (np->daddr_cache == NULL ||
+ !ipv6_addr_equal(&fl->fl6_dst, np->daddr_cache)))
+ || (fl->oif && fl->oif != dst->dev->ifindex)) {
+ dst_release(dst);
+ dst = NULL;
}
+out:
+ return dst;
+}
+
+static int ip6_dst_lookup_tail(struct sock *sk,
+ struct dst_entry **dst, struct flowi *fl)
+{
+ int err;
+
if (*dst == NULL)
*dst = ip6_route_output(sk, fl);
@@ -773,7 +776,6 @@ int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
if (ipv6_addr_any(&fl->fl6_src)) {
err = ipv6_get_saddr(*dst, &fl->fl6_dst, &fl->fl6_src);
-
if (err)
goto out_err_release;
}
@@ -786,8 +788,48 @@ out_err_release:
return err;
}
+/**
+ * ip6_dst_lookup - perform route lookup on flow
+ * @sk: socket which provides route info
+ * @dst: pointer to dst_entry * for result
+ * @fl: flow to lookup
+ *
+ * This function performs a route lookup on the given flow.
+ *
+ * It returns zero on success, or a standard errno code on error.
+ */
+int ip6_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
+{
+ *dst = NULL;
+ return ip6_dst_lookup_tail(sk, dst, fl);
+}
EXPORT_SYMBOL_GPL(ip6_dst_lookup);
+/**
+ * ip6_sk_dst_lookup - perform socket cached route lookup on flow
+ * @sk: socket which provides the dst cache and route info
+ * @dst: pointer to dst_entry * for result
+ * @fl: flow to lookup
+ *
+ * This function performs a route lookup on the given flow with the
+ * possibility of using the cached route in the socket if it is valid.
+ * It will take the socket dst lock when operating on the dst cache.
+ * As a result, this function can only be used in process context.
+ *
+ * It returns zero on success, or a standard errno code on error.
+ */
+int ip6_sk_dst_lookup(struct sock *sk, struct dst_entry **dst, struct flowi *fl)
+{
+ *dst = NULL;
+ if (sk) {
+ *dst = sk_dst_check(sk, inet6_sk(sk)->dst_cookie);
+ *dst = ip6_sk_dst_check(sk, *dst, fl);
+ }
+
+ return ip6_dst_lookup_tail(sk, dst, fl);
+}
+EXPORT_SYMBOL_GPL(ip6_sk_dst_lookup);
+
static inline int ip6_ufo_append_data(struct sock *sk,
int getfrag(void *from, char *to, int offset, int len,
int odd, struct sk_buff *skb),
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 923989d0520d..b76fd7fba5f5 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -270,7 +270,7 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
inet->rcv_saddr = LOOPBACK4_IPV6;
sk->sk_gso_type = SKB_GSO_TCPV6;
- ip6_dst_store(sk, dst, NULL);
+ __ip6_dst_store(sk, dst, NULL);
icsk->icsk_ext_hdr_len = 0;
if (np->opt)
@@ -947,7 +947,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
*/
sk->sk_gso_type = SKB_GSO_TCPV6;
- ip6_dst_store(newsk, dst, NULL);
+ __ip6_dst_store(newsk, dst, NULL);
newtcp6sk = (struct tcp6_sock *)newsk;
inet_sk(newsk)->pinet6 = &newtcp6sk->inet6;
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index ccc57f434cd3..3d54f246411e 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -782,7 +782,7 @@ do_udp_sendmsg:
connected = 0;
}
- err = ip6_dst_lookup(sk, &dst, fl);
+ err = ip6_sk_dst_lookup(sk, &dst, fl);
if (err)
goto out;
if (final_p)
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