tcp: constify tcp_v{4|6}_route_req() sock argument

These functions do not change the listener socket.
Goal is to make sure tcp_conn_request() is not messing with
listener in a racy way.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/net/tcp.h b/include/net/tcp.h
index 5aa6672..2c7dfe5 100644 (file)
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -1711,7 +1711,7 @@ struct tcp_request_sock_ops {
        __u32 (*cookie_init_seq)(const struct sk_buff *skb,
                                 __u16 *mss);
 #endif
-       struct dst_entry *(*route_req)(struct sock *sk, struct flowi *fl,
+       struct dst_entry *(*route_req)(const struct sock *sk, struct flowi *fl,
                                       const struct request_sock *req,
                                       bool *strict);
        __u32 (*init_seq)(const struct sk_buff *skb);

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index ee0239e..f551e9e 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1180,7 +1180,8 @@ static void tcp_v4_init_req(struct request_sock *req,
        ireq->opt = tcp_v4_save_options(skb);
 }
 
-static struct dst_entry *tcp_v4_route_req(struct sock *sk, struct flowi *fl,
+static struct dst_entry *tcp_v4_route_req(const struct sock *sk,
+                                         struct flowi *fl,
                                          const struct request_sock *req,
                                          bool *strict)
 {

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2330c7b..97bc26e 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -689,7 +689,8 @@ static void tcp_v6_init_req(struct request_sock *req,
        }
 }
 
-static struct dst_entry *tcp_v6_route_req(struct sock *sk, struct flowi *fl,
+static struct dst_entry *tcp_v6_route_req(const struct sock *sk,
+                                         struct flowi *fl,
                                          const struct request_sock *req,
                                          bool *strict)
 {