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70041088 AG |
1 | /* |
2 | * Copyright (c) 2006 Oracle. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | * | |
32 | */ | |
33 | #include <linux/kernel.h> | |
5a0e3ad6 | 34 | #include <linux/gfp.h> |
70041088 AG |
35 | #include <linux/in.h> |
36 | #include <net/tcp.h> | |
37 | ||
38 | #include "rds.h" | |
39 | #include "tcp.h" | |
40 | ||
467fa153 | 41 | int rds_tcp_keepalive(struct socket *sock) |
f711a6ae SV |
42 | { |
43 | /* values below based on xs_udp_default_timeout */ | |
44 | int keepidle = 5; /* send a probe 'keepidle' secs after last data */ | |
45 | int keepcnt = 5; /* number of unack'ed probes before declaring dead */ | |
46 | int keepalive = 1; | |
47 | int ret = 0; | |
48 | ||
49 | ret = kernel_setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, | |
50 | (char *)&keepalive, sizeof(keepalive)); | |
51 | if (ret < 0) | |
52 | goto bail; | |
53 | ||
54 | ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPCNT, | |
55 | (char *)&keepcnt, sizeof(keepcnt)); | |
56 | if (ret < 0) | |
57 | goto bail; | |
58 | ||
59 | ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPIDLE, | |
60 | (char *)&keepidle, sizeof(keepidle)); | |
61 | if (ret < 0) | |
62 | goto bail; | |
63 | ||
64 | /* KEEPINTVL is the interval between successive probes. We follow | |
65 | * the model in xs_tcp_finish_connecting() and re-use keepidle. | |
66 | */ | |
67 | ret = kernel_setsockopt(sock, IPPROTO_TCP, TCP_KEEPINTVL, | |
68 | (char *)&keepidle, sizeof(keepidle)); | |
69 | bail: | |
70 | return ret; | |
71 | } | |
72 | ||
467fa153 | 73 | int rds_tcp_accept_one(struct socket *sock) |
70041088 AG |
74 | { |
75 | struct socket *new_sock = NULL; | |
76 | struct rds_connection *conn; | |
77 | int ret; | |
78 | struct inet_sock *inet; | |
f711a6ae | 79 | struct rds_tcp_connection *rs_tcp; |
70041088 | 80 | |
d5a8ac28 SV |
81 | ret = sock_create_kern(sock_net(sock->sk), sock->sk->sk_family, |
82 | sock->sk->sk_type, sock->sk->sk_protocol, | |
83 | &new_sock); | |
70041088 AG |
84 | if (ret) |
85 | goto out; | |
86 | ||
87 | new_sock->type = sock->type; | |
88 | new_sock->ops = sock->ops; | |
89 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK); | |
90 | if (ret < 0) | |
91 | goto out; | |
92 | ||
f711a6ae SV |
93 | ret = rds_tcp_keepalive(new_sock); |
94 | if (ret < 0) | |
95 | goto out; | |
96 | ||
70041088 AG |
97 | rds_tcp_tune(new_sock); |
98 | ||
99 | inet = inet_sk(new_sock->sk); | |
100 | ||
6884b348 JP |
101 | rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n", |
102 | &inet->inet_saddr, ntohs(inet->inet_sport), | |
103 | &inet->inet_daddr, ntohs(inet->inet_dport)); | |
70041088 | 104 | |
d5a8ac28 SV |
105 | conn = rds_conn_create(sock_net(sock->sk), |
106 | inet->inet_saddr, inet->inet_daddr, | |
c720c7e8 | 107 | &rds_tcp_transport, GFP_KERNEL); |
70041088 AG |
108 | if (IS_ERR(conn)) { |
109 | ret = PTR_ERR(conn); | |
110 | goto out; | |
111 | } | |
f711a6ae | 112 | /* An incoming SYN request came in, and TCP just accepted it. |
f711a6ae SV |
113 | * |
114 | * If the client reboots, this conn will need to be cleaned up. | |
115 | * rds_tcp_state_change() will do that cleanup | |
116 | */ | |
117 | rs_tcp = (struct rds_tcp_connection *)conn->c_transport_data; | |
3b20fc38 | 118 | rds_conn_transition(conn, RDS_CONN_DOWN, RDS_CONN_CONNECTING); |
eb192840 SV |
119 | if (rs_tcp->t_sock) { |
120 | /* Need to resolve a duelling SYN between peers. | |
121 | * We have an outstanding SYN to this peer, which may | |
122 | * potentially have transitioned to the RDS_CONN_UP state, | |
123 | * so we must quiesce any send threads before resetting | |
124 | * c_transport_data. | |
125 | */ | |
126 | wait_event(conn->c_waitq, | |
127 | !test_bit(RDS_IN_XMIT, &conn->c_flags)); | |
128 | if (ntohl(inet->inet_saddr) < ntohl(inet->inet_daddr)) { | |
129 | struct sock *nsk = new_sock->sk; | |
130 | ||
131 | nsk->sk_user_data = NULL; | |
132 | nsk->sk_prot->disconnect(nsk, 0); | |
133 | tcp_done(nsk); | |
134 | new_sock = NULL; | |
135 | ret = 0; | |
136 | goto out; | |
137 | } else if (rs_tcp->t_sock) { | |
138 | rds_tcp_restore_callbacks(rs_tcp->t_sock, rs_tcp); | |
139 | conn->c_outgoing = 0; | |
140 | } | |
141 | } | |
70041088 | 142 | rds_tcp_set_callbacks(new_sock, conn); |
eb192840 | 143 | rds_connect_complete(conn); /* marks RDS_CONN_UP */ |
70041088 AG |
144 | new_sock = NULL; |
145 | ret = 0; | |
146 | ||
147 | out: | |
148 | if (new_sock) | |
149 | sock_release(new_sock); | |
150 | return ret; | |
151 | } | |
152 | ||
676d2369 | 153 | void rds_tcp_listen_data_ready(struct sock *sk) |
70041088 | 154 | { |
676d2369 | 155 | void (*ready)(struct sock *sk); |
70041088 AG |
156 | |
157 | rdsdebug("listen data ready sk %p\n", sk); | |
158 | ||
bfdc587c | 159 | read_lock(&sk->sk_callback_lock); |
70041088 | 160 | ready = sk->sk_user_data; |
8690bfa1 | 161 | if (!ready) { /* check for teardown race */ |
70041088 AG |
162 | ready = sk->sk_data_ready; |
163 | goto out; | |
164 | } | |
165 | ||
166 | /* | |
167 | * ->sk_data_ready is also called for a newly established child socket | |
168 | * before it has been accepted and the accepter has set up their | |
169 | * data_ready.. we only want to queue listen work for our listening | |
170 | * socket | |
171 | */ | |
172 | if (sk->sk_state == TCP_LISTEN) | |
467fa153 | 173 | rds_tcp_accept_work(sk); |
70041088 AG |
174 | |
175 | out: | |
bfdc587c | 176 | read_unlock(&sk->sk_callback_lock); |
676d2369 | 177 | ready(sk); |
70041088 AG |
178 | } |
179 | ||
467fa153 | 180 | struct socket *rds_tcp_listen_init(struct net *net) |
70041088 AG |
181 | { |
182 | struct sockaddr_in sin; | |
183 | struct socket *sock = NULL; | |
184 | int ret; | |
185 | ||
467fa153 | 186 | ret = sock_create_kern(net, PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
70041088 AG |
187 | if (ret < 0) |
188 | goto out; | |
189 | ||
4a17fd52 | 190 | sock->sk->sk_reuse = SK_CAN_REUSE; |
70041088 AG |
191 | rds_tcp_nonagle(sock); |
192 | ||
193 | write_lock_bh(&sock->sk->sk_callback_lock); | |
194 | sock->sk->sk_user_data = sock->sk->sk_data_ready; | |
195 | sock->sk->sk_data_ready = rds_tcp_listen_data_ready; | |
196 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
197 | ||
01728371 | 198 | sin.sin_family = PF_INET; |
70041088 AG |
199 | sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); |
200 | sin.sin_port = (__force u16)htons(RDS_TCP_PORT); | |
201 | ||
202 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); | |
203 | if (ret < 0) | |
204 | goto out; | |
205 | ||
206 | ret = sock->ops->listen(sock, 64); | |
207 | if (ret < 0) | |
208 | goto out; | |
209 | ||
467fa153 | 210 | return sock; |
70041088 AG |
211 | out: |
212 | if (sock) | |
213 | sock_release(sock); | |
467fa153 | 214 | return NULL; |
70041088 AG |
215 | } |
216 | ||
467fa153 | 217 | void rds_tcp_listen_stop(struct socket *sock) |
70041088 | 218 | { |
70041088 AG |
219 | struct sock *sk; |
220 | ||
8690bfa1 | 221 | if (!sock) |
70041088 AG |
222 | return; |
223 | ||
224 | sk = sock->sk; | |
225 | ||
226 | /* serialize with and prevent further callbacks */ | |
227 | lock_sock(sk); | |
228 | write_lock_bh(&sk->sk_callback_lock); | |
229 | if (sk->sk_user_data) { | |
230 | sk->sk_data_ready = sk->sk_user_data; | |
231 | sk->sk_user_data = NULL; | |
232 | } | |
233 | write_unlock_bh(&sk->sk_callback_lock); | |
234 | release_sock(sk); | |
235 | ||
236 | /* wait for accepts to stop and close the socket */ | |
237 | flush_workqueue(rds_wq); | |
238 | sock_release(sock); | |
70041088 | 239 | } |