inet, inet6: make tcp_sendmsg() and tcp_sendpage() through inet_sendmsg() and inet_sendpage()

a new boolean flag no_autobind is added to structure proto to avoid the autobind
calls when the protocol is TCP. Then sock_rps_record_flow() is called int the
TCP's sendmsg() and sendpage() pathes.

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
----
 include/net/inet_common.h |    4 ++++
 include/net/sock.h        |    1 +
 include/net/tcp.h         |    8 ++++----
 net/ipv4/af_inet.c        |   15 +++++++++------
 net/ipv4/tcp.c            |   11 +++++------
 net/ipv4/tcp_ipv4.c       |    3 +++
 net/ipv6/af_inet6.c       |    8 ++++----
 net/ipv6/tcp_ipv6.c       |    3 +++
 8 files changed, 33 insertions(+), 20 deletions(-)
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 17 insertions, 12 deletions

diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 3ceb025b16f2..6a1100c25a9f 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -727,28 +727,31 @@ int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
         sock_rps_record_flow(sk);
 
         /* We may need to bind the socket. */
-        if (!inet_sk(sk)->inet_num && inet_autobind(sk))
+        if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
+            inet_autobind(sk))
                 return -EAGAIN;
 
         return sk->sk_prot->sendmsg(iocb, sk, msg, size);
 }
 EXPORT_SYMBOL(inet_sendmsg);
 
-static ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
-                             size_t size, int flags)
+ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
+                      size_t size, int flags)
 {
         struct sock *sk = sock->sk;
 
         sock_rps_record_flow(sk);
 
         /* We may need to bind the socket. */
-        if (!inet_sk(sk)->inet_num && inet_autobind(sk))
+        if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
+            inet_autobind(sk))
                 return -EAGAIN;
 
         if (sk->sk_prot->sendpage)
                 return sk->sk_prot->sendpage(sk, page, offset, size, flags);
         return sock_no_sendpage(sock, page, offset, size, flags);
 }
+EXPORT_SYMBOL(inet_sendpage);
 
 int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
                  size_t size, int flags)
@@ -894,10 +897,10 @@ const struct proto_ops inet_stream_ops = {
         .shutdown          = inet_shutdown,
         .setsockopt        = sock_common_setsockopt,
         .getsockopt        = sock_common_getsockopt,
-        .sendmsg           = tcp_sendmsg,
+        .sendmsg           = inet_sendmsg,
         .recvmsg           = inet_recvmsg,
         .mmap              = sock_no_mmap,
-        .sendpage          = tcp_sendpage,
+        .sendpage          = inet_sendpage,
         .splice_read       = tcp_splice_read,
 #ifdef CONFIG_COMPAT
         .compat_setsockopt = compat_sock_common_setsockopt,
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index b8601b7683a6..9fce8a8a13aa 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -857,15 +857,15 @@ out_err:
         return sk_stream_error(sk, flags, err);
 }
 
-ssize_t tcp_sendpage(struct socket *sock, struct page *page, int offset,
-                     size_t size, int flags)
+int tcp_sendpage(struct sock *sk, struct page *page, int offset,
+                 size_t size, int flags)
 {
         ssize_t res;
-        struct sock *sk = sock->sk;
 
         if (!(sk->sk_route_caps & NETIF_F_SG) ||
             !(sk->sk_route_caps & NETIF_F_ALL_CSUM))
-                return sock_no_sendpage(sock, page, offset, size, flags);
+                return sock_no_sendpage(sk->sk_socket, page, offset, size,
+                                        flags);
 
         lock_sock(sk);
         TCP_CHECK_TIMER(sk);
@@ -899,10 +899,9 @@ static inline int select_size(struct sock *sk, int sg)
         return tmp;
 }
 
-int tcp_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
+int tcp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                 size_t size)
 {
-        struct sock *sk = sock->sk;
         struct iovec *iov;
         struct tcp_sock *tp = tcp_sk(sk);
         struct sk_buff *skb;
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 44545e8e8c92..020766292bb0 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2600,6 +2600,8 @@ struct proto tcp_prot = {
         .setsockopt             = tcp_setsockopt,
         .getsockopt             = tcp_getsockopt,
         .recvmsg                = tcp_recvmsg,
+        .sendmsg                = tcp_sendmsg,
+        .sendpage               = tcp_sendpage,
         .backlog_rcv            = tcp_v4_do_rcv,
         .hash                   = inet_hash,
         .unhash                 = inet_unhash,
@@ -2618,6 +2620,7 @@ struct proto tcp_prot = {
         .twsk_prot              = &tcp_timewait_sock_ops,
         .rsk_prot               = &tcp_request_sock_ops,
         .h.hashinfo             = &tcp_hashinfo,
+        .no_autobind            = true,
 #ifdef CONFIG_COMPAT
         .compat_setsockopt      = compat_tcp_setsockopt,
         .compat_getsockopt      = compat_tcp_getsockopt,