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33#include <linux/kernel.h>
34#include <linux/in.h>
35#include <net/tcp.h>
36
37#include "rds.h"
38#include "tcp.h"
39
40void rds_tcp_state_change(struct sock *sk)
41{
42 void (*state_change)(struct sock *sk);
43 struct rds_connection *conn;
44 struct rds_tcp_connection *tc;
45
46 read_lock_bh(&sk->sk_callback_lock);
47 conn = sk->sk_user_data;
48 if (!conn) {
49 state_change = sk->sk_state_change;
50 goto out;
51 }
52 tc = conn->c_transport_data;
53 state_change = tc->t_orig_state_change;
54
55 rdsdebug("sock %p state_change to %d\n", tc->t_sock, sk->sk_state);
56
57 switch(sk->sk_state) {
58
59 case TCP_SYN_SENT:
60 case TCP_SYN_RECV:
61 break;
62 case TCP_ESTABLISHED:
63 rds_connect_complete(conn);
64 break;
65 case TCP_CLOSE:
66 rds_conn_drop(conn);
67 default:
68 break;
69 }
70out:
71 read_unlock_bh(&sk->sk_callback_lock);
72 state_change(sk);
73}
74
75int rds_tcp_conn_connect(struct rds_connection *conn)
76{
77 struct socket *sock = NULL;
78 struct sockaddr_in src, dest;
79 int ret;
80
81 ret = sock_create(PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
82 if (ret < 0)
83 goto out;
84
85 rds_tcp_tune(sock);
86
87 src.sin_family = AF_INET;
88 src.sin_addr.s_addr = (__force u32)conn->c_laddr;
89 src.sin_port = (__force u16)htons(0);
90
91 ret = sock->ops->bind(sock, (struct sockaddr *)&src, sizeof(src));
92 if (ret) {
93 rdsdebug("bind failed with %d at address %pI4\n",
94 ret, &conn->c_laddr);
95 goto out;
96 }
97
98 dest.sin_family = AF_INET;
99 dest.sin_addr.s_addr = (__force u32)conn->c_faddr;
100 dest.sin_port = (__force u16)htons(RDS_TCP_PORT);
101
102
103
104
105
106 rds_tcp_set_callbacks(sock, conn);
107 ret = sock->ops->connect(sock, (struct sockaddr *)&dest, sizeof(dest),
108 O_NONBLOCK);
109 sock = NULL;
110
111 rdsdebug("connect to address %pI4 returned %d\n", &conn->c_faddr, ret);
112 if (ret == -EINPROGRESS)
113 ret = 0;
114
115out:
116 if (sock)
117 sock_release(sock);
118 return ret;
119}
120
121
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123
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125
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127
128
129
130void rds_tcp_conn_shutdown(struct rds_connection *conn)
131{
132 struct rds_tcp_connection *tc = conn->c_transport_data;
133 struct socket *sock = tc->t_sock;
134
135 rdsdebug("shutting down conn %p tc %p sock %p\n", conn, tc, sock);
136
137 if (sock) {
138 sock->ops->shutdown(sock, RCV_SHUTDOWN | SEND_SHUTDOWN);
139 lock_sock(sock->sk);
140 rds_tcp_restore_callbacks(sock, tc);
141
142 release_sock(sock->sk);
143 sock_release(sock);
144 }
145
146 if (tc->t_tinc) {
147 rds_inc_put(&tc->t_tinc->ti_inc);
148 tc->t_tinc = NULL;
149 }
150 tc->t_tinc_hdr_rem = sizeof(struct rds_header);
151 tc->t_tinc_data_rem = 0;
152}
153