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33 #include <linux/kernel.h>
40 void rds_tcp_state_change(struct sock *sk)
42 void (*state_change)(struct sock *sk);
43 struct rds_conn_path *cp;
44 struct rds_tcp_connection *tc;
46 read_lock_bh(&sk->sk_callback_lock);
47 cp = sk->sk_user_data;
49 state_change = sk->sk_state_change;
52 tc = cp->cp_transport_data;
53 state_change = tc->t_orig_state_change;
55 rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);
57 switch (sk->sk_state) {
58 /* ignore connecting sockets as they make progress */
63 /* Force the peer to reconnect so that we have the
64 * TCP ports going from <smaller-ip>.<transient> to
65 * <larger-ip>.<RDS_TCP_PORT>. We avoid marking the
66 * RDS connection as RDS_CONN_UP until the reconnect,
67 * to avoid RDS datagram loss.
69 if (rds_addr_cmp(&cp->cp_conn->c_laddr,
70 &cp->cp_conn->c_faddr) >= 0 &&
71 rds_conn_path_transition(cp, RDS_CONN_CONNECTING,
73 rds_conn_path_drop(cp, false);
75 rds_connect_path_complete(cp, RDS_CONN_CONNECTING);
80 rds_conn_path_drop(cp, false);
85 read_unlock_bh(&sk->sk_callback_lock);
89 int rds_tcp_conn_path_connect(struct rds_conn_path *cp)
91 struct socket *sock = NULL;
92 struct sockaddr_in6 sin6;
93 struct sockaddr_in sin;
94 struct sockaddr *addr;
98 struct rds_connection *conn = cp->cp_conn;
99 struct rds_tcp_connection *tc = cp->cp_transport_data;
101 /* for multipath rds,we only trigger the connection after
102 * the handshake probe has determined the number of paths.
104 if (cp->cp_index > 0 && cp->cp_conn->c_npaths < 2)
107 mutex_lock(&tc->t_conn_path_lock);
109 if (rds_conn_path_up(cp)) {
110 mutex_unlock(&tc->t_conn_path_lock);
113 if (ipv6_addr_v4mapped(&conn->c_laddr)) {
114 ret = sock_create_kern(rds_conn_net(conn), PF_INET,
115 SOCK_STREAM, IPPROTO_TCP, &sock);
118 ret = sock_create_kern(rds_conn_net(conn), PF_INET6,
119 SOCK_STREAM, IPPROTO_TCP, &sock);
129 sin6.sin6_family = AF_INET6;
130 sin6.sin6_addr = conn->c_laddr;
132 sin6.sin6_flowinfo = 0;
133 sin6.sin6_scope_id = conn->c_dev_if;
134 addr = (struct sockaddr *)&sin6;
135 addrlen = sizeof(sin6);
137 sin.sin_family = AF_INET;
138 sin.sin_addr.s_addr = conn->c_laddr.s6_addr32[3];
140 addr = (struct sockaddr *)&sin;
141 addrlen = sizeof(sin);
144 ret = kernel_bind(sock, addr, addrlen);
146 rdsdebug("bind failed with %d at address %pI6c\n",
147 ret, &conn->c_laddr);
152 sin6.sin6_family = AF_INET6;
153 sin6.sin6_addr = conn->c_faddr;
154 sin6.sin6_port = htons(RDS_TCP_PORT);
155 sin6.sin6_flowinfo = 0;
156 sin6.sin6_scope_id = conn->c_dev_if;
157 addr = (struct sockaddr *)&sin6;
158 addrlen = sizeof(sin6);
160 sin.sin_family = AF_INET;
161 sin.sin_addr.s_addr = conn->c_faddr.s6_addr32[3];
162 sin.sin_port = htons(RDS_TCP_PORT);
163 addr = (struct sockaddr *)&sin;
164 addrlen = sizeof(sin);
168 * once we call connect() we can start getting callbacks and they
171 rds_tcp_set_callbacks(sock, cp);
172 ret = kernel_connect(sock, addr, addrlen, O_NONBLOCK);
174 rdsdebug("connect to address %pI6c returned %d\n", &conn->c_faddr, ret);
175 if (ret == -EINPROGRESS)
178 rds_tcp_keepalive(sock);
181 rds_tcp_restore_callbacks(sock, cp->cp_transport_data);
185 mutex_unlock(&tc->t_conn_path_lock);
192 * Before killing the tcp socket this needs to serialize with callbacks. The
193 * caller has already grabbed the sending sem so we're serialized with other
196 * TCP calls the callbacks with the sock lock so we hold it while we reset the
197 * callbacks to those set by TCP. Our callbacks won't execute again once we
198 * hold the sock lock.
200 void rds_tcp_conn_path_shutdown(struct rds_conn_path *cp)
202 struct rds_tcp_connection *tc = cp->cp_transport_data;
203 struct socket *sock = tc->t_sock;
205 rdsdebug("shutting down conn %p tc %p sock %p\n",
206 cp->cp_conn, tc, sock);
209 if (rds_destroy_pending(cp->cp_conn))
210 sock_no_linger(sock->sk);
211 sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
213 rds_tcp_restore_callbacks(sock, tc); /* tc->tc_sock = NULL */
215 release_sock(sock->sk);
220 rds_inc_put(&tc->t_tinc->ti_inc);
223 tc->t_tinc_hdr_rem = sizeof(struct rds_header);
224 tc->t_tinc_data_rem = 0;