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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 | ||
5916e2c1 SV |
73 | /* rds_tcp_accept_one_path(): if accepting on cp_index > 0, make sure the |
74 | * client's ipaddr < server's ipaddr. Otherwise, close the accepted | |
75 | * socket and force a reconneect from smaller -> larger ip addr. The reason | |
76 | * we special case cp_index 0 is to allow the rds probe ping itself to itself | |
77 | * get through efficiently. | |
78 | * Since reconnects are only initiated from the node with the numerically | |
79 | * smaller ip address, we recycle conns in RDS_CONN_ERROR on the passive side | |
80 | * by moving them to CONNECTING in this function. | |
81 | */ | |
bb789763 | 82 | static |
5916e2c1 SV |
83 | struct rds_tcp_connection *rds_tcp_accept_one_path(struct rds_connection *conn) |
84 | { | |
85 | int i; | |
00354de5 | 86 | bool peer_is_smaller = IS_CANONICAL(conn->c_faddr, conn->c_laddr); |
1a0e100f | 87 | int npaths = max_t(int, 1, conn->c_npaths); |
5916e2c1 | 88 | |
1a0e100f | 89 | /* for mprds, all paths MUST be initiated by the peer |
5916e2c1 SV |
90 | * with the smaller address. |
91 | */ | |
1a0e100f SV |
92 | if (!peer_is_smaller) { |
93 | /* Make sure we initiate at least one path if this | |
94 | * has not already been done; rds_start_mprds() will | |
95 | * take care of additional paths, if necessary. | |
96 | */ | |
97 | if (npaths == 1) | |
98 | rds_conn_path_connect_if_down(&conn->c_path[0]); | |
5916e2c1 | 99 | return NULL; |
1a0e100f | 100 | } |
5916e2c1 | 101 | |
117d15bb | 102 | for (i = 0; i < npaths; i++) { |
5916e2c1 SV |
103 | struct rds_conn_path *cp = &conn->c_path[i]; |
104 | ||
105 | if (rds_conn_path_transition(cp, RDS_CONN_DOWN, | |
106 | RDS_CONN_CONNECTING) || | |
107 | rds_conn_path_transition(cp, RDS_CONN_ERROR, | |
108 | RDS_CONN_CONNECTING)) { | |
109 | return cp->cp_transport_data; | |
110 | } | |
111 | } | |
112 | return NULL; | |
113 | } | |
114 | ||
c14b0366 | 115 | void rds_tcp_set_linger(struct socket *sock) |
10beea7d SV |
116 | { |
117 | struct linger no_linger = { | |
118 | .l_onoff = 1, | |
119 | .l_linger = 0, | |
120 | }; | |
121 | ||
122 | kernel_setsockopt(sock, SOL_SOCKET, SO_LINGER, | |
123 | (char *)&no_linger, sizeof(no_linger)); | |
124 | } | |
125 | ||
467fa153 | 126 | int rds_tcp_accept_one(struct socket *sock) |
70041088 AG |
127 | { |
128 | struct socket *new_sock = NULL; | |
129 | struct rds_connection *conn; | |
130 | int ret; | |
131 | struct inet_sock *inet; | |
bd7c5f98 SV |
132 | struct rds_tcp_connection *rs_tcp = NULL; |
133 | int conn_state; | |
ea3b1ea5 | 134 | struct rds_conn_path *cp; |
70041088 | 135 | |
37e14f4f SV |
136 | if (!sock) /* module unload or netns delete in progress */ |
137 | return -ENETUNREACH; | |
138 | ||
0933a578 | 139 | ret = sock_create_lite(sock->sk->sk_family, |
d5a8ac28 SV |
140 | sock->sk->sk_type, sock->sk->sk_protocol, |
141 | &new_sock); | |
70041088 AG |
142 | if (ret) |
143 | goto out; | |
144 | ||
145 | new_sock->type = sock->type; | |
146 | new_sock->ops = sock->ops; | |
cdfbabfb | 147 | ret = sock->ops->accept(sock, new_sock, O_NONBLOCK, true); |
70041088 AG |
148 | if (ret < 0) |
149 | goto out; | |
150 | ||
f711a6ae SV |
151 | ret = rds_tcp_keepalive(new_sock); |
152 | if (ret < 0) | |
153 | goto out; | |
154 | ||
70041088 AG |
155 | rds_tcp_tune(new_sock); |
156 | ||
157 | inet = inet_sk(new_sock->sk); | |
158 | ||
6884b348 JP |
159 | rdsdebug("accepted tcp %pI4:%u -> %pI4:%u\n", |
160 | &inet->inet_saddr, ntohs(inet->inet_sport), | |
161 | &inet->inet_daddr, ntohs(inet->inet_dport)); | |
70041088 | 162 | |
d5a8ac28 SV |
163 | conn = rds_conn_create(sock_net(sock->sk), |
164 | inet->inet_saddr, inet->inet_daddr, | |
c720c7e8 | 165 | &rds_tcp_transport, GFP_KERNEL); |
70041088 AG |
166 | if (IS_ERR(conn)) { |
167 | ret = PTR_ERR(conn); | |
168 | goto out; | |
169 | } | |
f711a6ae | 170 | /* An incoming SYN request came in, and TCP just accepted it. |
f711a6ae SV |
171 | * |
172 | * If the client reboots, this conn will need to be cleaned up. | |
173 | * rds_tcp_state_change() will do that cleanup | |
174 | */ | |
5916e2c1 SV |
175 | rs_tcp = rds_tcp_accept_one_path(conn); |
176 | if (!rs_tcp) | |
177 | goto rst_nsk; | |
02105b2c | 178 | mutex_lock(&rs_tcp->t_conn_path_lock); |
5916e2c1 SV |
179 | cp = rs_tcp->t_cpath; |
180 | conn_state = rds_conn_path_state(cp); | |
1a0e100f SV |
181 | WARN_ON(conn_state == RDS_CONN_UP); |
182 | if (conn_state != RDS_CONN_CONNECTING && conn_state != RDS_CONN_ERROR) | |
bd7c5f98 | 183 | goto rst_nsk; |
eb192840 | 184 | if (rs_tcp->t_sock) { |
41500c3e SV |
185 | /* Duelling SYN has been handled in rds_tcp_accept_one() */ |
186 | rds_tcp_reset_callbacks(new_sock, cp); | |
187 | /* rds_connect_path_complete() marks RDS_CONN_UP */ | |
188 | rds_connect_path_complete(cp, RDS_CONN_RESETTING); | |
335b48d9 | 189 | } else { |
ea3b1ea5 SV |
190 | rds_tcp_set_callbacks(new_sock, cp); |
191 | rds_connect_path_complete(cp, RDS_CONN_CONNECTING); | |
eb192840 | 192 | } |
70041088 AG |
193 | new_sock = NULL; |
194 | ret = 0; | |
69b92b5b SV |
195 | if (conn->c_npaths == 0) |
196 | rds_send_ping(cp->cp_conn, cp->cp_index); | |
bd7c5f98 SV |
197 | goto out; |
198 | rst_nsk: | |
10beea7d SV |
199 | /* reset the newly returned accept sock and bail. |
200 | * It is safe to set linger on new_sock because the RDS connection | |
201 | * has not been brought up on new_sock, so no RDS-level data could | |
202 | * be pending on it. By setting linger, we achieve the side-effect | |
203 | * of avoiding TIME_WAIT state on new_sock. | |
204 | */ | |
205 | rds_tcp_set_linger(new_sock); | |
335b48d9 | 206 | kernel_sock_shutdown(new_sock, SHUT_RDWR); |
bd7c5f98 | 207 | ret = 0; |
70041088 | 208 | out: |
bd7c5f98 | 209 | if (rs_tcp) |
02105b2c | 210 | mutex_unlock(&rs_tcp->t_conn_path_lock); |
70041088 AG |
211 | if (new_sock) |
212 | sock_release(new_sock); | |
213 | return ret; | |
214 | } | |
215 | ||
676d2369 | 216 | void rds_tcp_listen_data_ready(struct sock *sk) |
70041088 | 217 | { |
676d2369 | 218 | void (*ready)(struct sock *sk); |
70041088 AG |
219 | |
220 | rdsdebug("listen data ready sk %p\n", sk); | |
221 | ||
38036629 | 222 | read_lock_bh(&sk->sk_callback_lock); |
70041088 | 223 | ready = sk->sk_user_data; |
8690bfa1 | 224 | if (!ready) { /* check for teardown race */ |
70041088 AG |
225 | ready = sk->sk_data_ready; |
226 | goto out; | |
227 | } | |
228 | ||
229 | /* | |
230 | * ->sk_data_ready is also called for a newly established child socket | |
231 | * before it has been accepted and the accepter has set up their | |
232 | * data_ready.. we only want to queue listen work for our listening | |
233 | * socket | |
b21dd450 SV |
234 | * |
235 | * (*ready)() may be null if we are racing with netns delete, and | |
236 | * the listen socket is being torn down. | |
70041088 AG |
237 | */ |
238 | if (sk->sk_state == TCP_LISTEN) | |
467fa153 | 239 | rds_tcp_accept_work(sk); |
a93d01f5 SV |
240 | else |
241 | ready = rds_tcp_listen_sock_def_readable(sock_net(sk)); | |
70041088 AG |
242 | |
243 | out: | |
38036629 | 244 | read_unlock_bh(&sk->sk_callback_lock); |
b21dd450 SV |
245 | if (ready) |
246 | ready(sk); | |
70041088 AG |
247 | } |
248 | ||
467fa153 | 249 | struct socket *rds_tcp_listen_init(struct net *net) |
70041088 AG |
250 | { |
251 | struct sockaddr_in sin; | |
252 | struct socket *sock = NULL; | |
253 | int ret; | |
254 | ||
467fa153 | 255 | ret = sock_create_kern(net, PF_INET, SOCK_STREAM, IPPROTO_TCP, &sock); |
70041088 AG |
256 | if (ret < 0) |
257 | goto out; | |
258 | ||
4a17fd52 | 259 | sock->sk->sk_reuse = SK_CAN_REUSE; |
70041088 AG |
260 | rds_tcp_nonagle(sock); |
261 | ||
262 | write_lock_bh(&sock->sk->sk_callback_lock); | |
263 | sock->sk->sk_user_data = sock->sk->sk_data_ready; | |
264 | sock->sk->sk_data_ready = rds_tcp_listen_data_ready; | |
265 | write_unlock_bh(&sock->sk->sk_callback_lock); | |
266 | ||
01728371 | 267 | sin.sin_family = PF_INET; |
70041088 AG |
268 | sin.sin_addr.s_addr = (__force u32)htonl(INADDR_ANY); |
269 | sin.sin_port = (__force u16)htons(RDS_TCP_PORT); | |
270 | ||
271 | ret = sock->ops->bind(sock, (struct sockaddr *)&sin, sizeof(sin)); | |
272 | if (ret < 0) | |
273 | goto out; | |
274 | ||
275 | ret = sock->ops->listen(sock, 64); | |
276 | if (ret < 0) | |
277 | goto out; | |
278 | ||
467fa153 | 279 | return sock; |
70041088 AG |
280 | out: |
281 | if (sock) | |
282 | sock_release(sock); | |
467fa153 | 283 | return NULL; |
70041088 AG |
284 | } |
285 | ||
b21dd450 | 286 | void rds_tcp_listen_stop(struct socket *sock, struct work_struct *acceptor) |
70041088 | 287 | { |
70041088 AG |
288 | struct sock *sk; |
289 | ||
8690bfa1 | 290 | if (!sock) |
70041088 AG |
291 | return; |
292 | ||
293 | sk = sock->sk; | |
294 | ||
295 | /* serialize with and prevent further callbacks */ | |
296 | lock_sock(sk); | |
297 | write_lock_bh(&sk->sk_callback_lock); | |
298 | if (sk->sk_user_data) { | |
299 | sk->sk_data_ready = sk->sk_user_data; | |
300 | sk->sk_user_data = NULL; | |
301 | } | |
302 | write_unlock_bh(&sk->sk_callback_lock); | |
303 | release_sock(sk); | |
304 | ||
305 | /* wait for accepts to stop and close the socket */ | |
306 | flush_workqueue(rds_wq); | |
b21dd450 | 307 | flush_work(acceptor); |
70041088 | 308 | sock_release(sock); |
70041088 | 309 | } |