Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 34 | #include <linux/slab.h> |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 35 | #include <linux/in.h> |
Paul Gortmaker | 3a9a231 | 2011-05-27 09:12:25 -0400 | [diff] [blame] | 36 | #include <linux/module.h> |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 37 | #include <net/tcp.h> |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 38 | #include <net/net_namespace.h> |
| 39 | #include <net/netns/generic.h> |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 40 | |
| 41 | #include "rds.h" |
| 42 | #include "tcp.h" |
| 43 | |
| 44 | /* only for info exporting */ |
| 45 | static DEFINE_SPINLOCK(rds_tcp_tc_list_lock); |
| 46 | static LIST_HEAD(rds_tcp_tc_list); |
stephen hemminger | ff51bf8 | 2010-10-19 08:08:33 +0000 | [diff] [blame] | 47 | static unsigned int rds_tcp_tc_count; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 48 | |
| 49 | /* Track rds_tcp_connection structs so they can be cleaned up */ |
| 50 | static DEFINE_SPINLOCK(rds_tcp_conn_lock); |
| 51 | static LIST_HEAD(rds_tcp_conn_list); |
| 52 | |
| 53 | static struct kmem_cache *rds_tcp_conn_slab; |
| 54 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 55 | static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write, |
| 56 | void __user *buffer, size_t *lenp, |
| 57 | loff_t *fpos); |
| 58 | |
| 59 | int rds_tcp_min_sndbuf = SOCK_MIN_SNDBUF; |
| 60 | int rds_tcp_min_rcvbuf = SOCK_MIN_RCVBUF; |
| 61 | |
| 62 | static struct ctl_table rds_tcp_sysctl_table[] = { |
| 63 | #define RDS_TCP_SNDBUF 0 |
| 64 | { |
| 65 | .procname = "rds_tcp_sndbuf", |
| 66 | /* data is per-net pointer */ |
| 67 | .maxlen = sizeof(int), |
| 68 | .mode = 0644, |
| 69 | .proc_handler = rds_tcp_skbuf_handler, |
| 70 | .extra1 = &rds_tcp_min_sndbuf, |
| 71 | }, |
| 72 | #define RDS_TCP_RCVBUF 1 |
| 73 | { |
| 74 | .procname = "rds_tcp_rcvbuf", |
| 75 | /* data is per-net pointer */ |
| 76 | .maxlen = sizeof(int), |
| 77 | .mode = 0644, |
| 78 | .proc_handler = rds_tcp_skbuf_handler, |
| 79 | .extra1 = &rds_tcp_min_rcvbuf, |
| 80 | }, |
| 81 | { } |
| 82 | }; |
| 83 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 84 | /* doing it this way avoids calling tcp_sk() */ |
| 85 | void rds_tcp_nonagle(struct socket *sock) |
| 86 | { |
| 87 | mm_segment_t oldfs = get_fs(); |
| 88 | int val = 1; |
| 89 | |
| 90 | set_fs(KERNEL_DS); |
| 91 | sock->ops->setsockopt(sock, SOL_TCP, TCP_NODELAY, (char __user *)&val, |
| 92 | sizeof(val)); |
| 93 | set_fs(oldfs); |
| 94 | } |
| 95 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 96 | u32 rds_tcp_snd_nxt(struct rds_tcp_connection *tc) |
| 97 | { |
| 98 | return tcp_sk(tc->t_sock->sk)->snd_nxt; |
| 99 | } |
| 100 | |
| 101 | u32 rds_tcp_snd_una(struct rds_tcp_connection *tc) |
| 102 | { |
| 103 | return tcp_sk(tc->t_sock->sk)->snd_una; |
| 104 | } |
| 105 | |
| 106 | void rds_tcp_restore_callbacks(struct socket *sock, |
| 107 | struct rds_tcp_connection *tc) |
| 108 | { |
| 109 | rdsdebug("restoring sock %p callbacks from tc %p\n", sock, tc); |
| 110 | write_lock_bh(&sock->sk->sk_callback_lock); |
| 111 | |
| 112 | /* done under the callback_lock to serialize with write_space */ |
| 113 | spin_lock(&rds_tcp_tc_list_lock); |
| 114 | list_del_init(&tc->t_list_item); |
| 115 | rds_tcp_tc_count--; |
| 116 | spin_unlock(&rds_tcp_tc_list_lock); |
| 117 | |
| 118 | tc->t_sock = NULL; |
| 119 | |
| 120 | sock->sk->sk_write_space = tc->t_orig_write_space; |
| 121 | sock->sk->sk_data_ready = tc->t_orig_data_ready; |
| 122 | sock->sk->sk_state_change = tc->t_orig_state_change; |
| 123 | sock->sk->sk_user_data = NULL; |
| 124 | |
| 125 | write_unlock_bh(&sock->sk->sk_callback_lock); |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * This is the only path that sets tc->t_sock. Send and receive trust that |
Sowmini Varadhan | eb19284 | 2016-05-02 11:24:51 -0700 | [diff] [blame] | 130 | * it is set. The RDS_CONN_UP bit protects those paths from being |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 131 | * called while it isn't set. |
| 132 | */ |
| 133 | void rds_tcp_set_callbacks(struct socket *sock, struct rds_connection *conn) |
| 134 | { |
| 135 | struct rds_tcp_connection *tc = conn->c_transport_data; |
| 136 | |
| 137 | rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc); |
| 138 | write_lock_bh(&sock->sk->sk_callback_lock); |
| 139 | |
| 140 | /* done under the callback_lock to serialize with write_space */ |
| 141 | spin_lock(&rds_tcp_tc_list_lock); |
| 142 | list_add_tail(&tc->t_list_item, &rds_tcp_tc_list); |
| 143 | rds_tcp_tc_count++; |
| 144 | spin_unlock(&rds_tcp_tc_list_lock); |
| 145 | |
| 146 | /* accepted sockets need our listen data ready undone */ |
| 147 | if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready) |
| 148 | sock->sk->sk_data_ready = sock->sk->sk_user_data; |
| 149 | |
| 150 | tc->t_sock = sock; |
| 151 | tc->conn = conn; |
| 152 | tc->t_orig_data_ready = sock->sk->sk_data_ready; |
| 153 | tc->t_orig_write_space = sock->sk->sk_write_space; |
| 154 | tc->t_orig_state_change = sock->sk->sk_state_change; |
| 155 | |
| 156 | sock->sk->sk_user_data = conn; |
| 157 | sock->sk->sk_data_ready = rds_tcp_data_ready; |
| 158 | sock->sk->sk_write_space = rds_tcp_write_space; |
| 159 | sock->sk->sk_state_change = rds_tcp_state_change; |
| 160 | |
| 161 | write_unlock_bh(&sock->sk->sk_callback_lock); |
| 162 | } |
| 163 | |
| 164 | static void rds_tcp_tc_info(struct socket *sock, unsigned int len, |
| 165 | struct rds_info_iterator *iter, |
| 166 | struct rds_info_lengths *lens) |
| 167 | { |
| 168 | struct rds_info_tcp_socket tsinfo; |
| 169 | struct rds_tcp_connection *tc; |
| 170 | unsigned long flags; |
| 171 | struct sockaddr_in sin; |
| 172 | int sinlen; |
| 173 | |
| 174 | spin_lock_irqsave(&rds_tcp_tc_list_lock, flags); |
| 175 | |
| 176 | if (len / sizeof(tsinfo) < rds_tcp_tc_count) |
| 177 | goto out; |
| 178 | |
| 179 | list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) { |
| 180 | |
| 181 | sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0); |
| 182 | tsinfo.local_addr = sin.sin_addr.s_addr; |
| 183 | tsinfo.local_port = sin.sin_port; |
| 184 | sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1); |
| 185 | tsinfo.peer_addr = sin.sin_addr.s_addr; |
| 186 | tsinfo.peer_port = sin.sin_port; |
| 187 | |
| 188 | tsinfo.hdr_rem = tc->t_tinc_hdr_rem; |
| 189 | tsinfo.data_rem = tc->t_tinc_data_rem; |
| 190 | tsinfo.last_sent_nxt = tc->t_last_sent_nxt; |
| 191 | tsinfo.last_expected_una = tc->t_last_expected_una; |
| 192 | tsinfo.last_seen_una = tc->t_last_seen_una; |
| 193 | |
| 194 | rds_info_copy(iter, &tsinfo, sizeof(tsinfo)); |
| 195 | } |
| 196 | |
| 197 | out: |
| 198 | lens->nr = rds_tcp_tc_count; |
| 199 | lens->each = sizeof(tsinfo); |
| 200 | |
| 201 | spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags); |
| 202 | } |
| 203 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 204 | static int rds_tcp_laddr_check(struct net *net, __be32 addr) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 205 | { |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 206 | if (inet_addr_type(net, addr) == RTN_LOCAL) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 207 | return 0; |
| 208 | return -EADDRNOTAVAIL; |
| 209 | } |
| 210 | |
| 211 | static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp) |
| 212 | { |
| 213 | struct rds_tcp_connection *tc; |
| 214 | |
| 215 | tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 216 | if (!tc) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 217 | return -ENOMEM; |
| 218 | |
Sowmini Varadhan | bd7c5f9 | 2016-05-02 11:24:52 -0700 | [diff] [blame^] | 219 | mutex_init(&tc->t_conn_lock); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 220 | tc->t_sock = NULL; |
| 221 | tc->t_tinc = NULL; |
| 222 | tc->t_tinc_hdr_rem = sizeof(struct rds_header); |
| 223 | tc->t_tinc_data_rem = 0; |
| 224 | |
| 225 | conn->c_transport_data = tc; |
| 226 | |
| 227 | spin_lock_irq(&rds_tcp_conn_lock); |
| 228 | list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list); |
| 229 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 230 | |
| 231 | rdsdebug("alloced tc %p\n", conn->c_transport_data); |
| 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | static void rds_tcp_conn_free(void *arg) |
| 236 | { |
| 237 | struct rds_tcp_connection *tc = arg; |
Pavel Emelyanov | 8200a59 | 2010-11-02 01:54:01 +0000 | [diff] [blame] | 238 | unsigned long flags; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 239 | rdsdebug("freeing tc %p\n", tc); |
Pavel Emelyanov | 8200a59 | 2010-11-02 01:54:01 +0000 | [diff] [blame] | 240 | |
| 241 | spin_lock_irqsave(&rds_tcp_conn_lock, flags); |
| 242 | list_del(&tc->t_tcp_node); |
| 243 | spin_unlock_irqrestore(&rds_tcp_conn_lock, flags); |
| 244 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 245 | kmem_cache_free(rds_tcp_conn_slab, tc); |
| 246 | } |
| 247 | |
| 248 | static void rds_tcp_destroy_conns(void) |
| 249 | { |
| 250 | struct rds_tcp_connection *tc, *_tc; |
| 251 | LIST_HEAD(tmp_list); |
| 252 | |
| 253 | /* avoid calling conn_destroy with irqs off */ |
| 254 | spin_lock_irq(&rds_tcp_conn_lock); |
| 255 | list_splice(&rds_tcp_conn_list, &tmp_list); |
| 256 | INIT_LIST_HEAD(&rds_tcp_conn_list); |
| 257 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 258 | |
| 259 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { |
| 260 | if (tc->conn->c_passive) |
| 261 | rds_conn_destroy(tc->conn->c_passive); |
| 262 | rds_conn_destroy(tc->conn); |
| 263 | } |
| 264 | } |
| 265 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 266 | static void rds_tcp_exit(void); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 267 | |
| 268 | struct rds_transport rds_tcp_transport = { |
| 269 | .laddr_check = rds_tcp_laddr_check, |
| 270 | .xmit_prepare = rds_tcp_xmit_prepare, |
| 271 | .xmit_complete = rds_tcp_xmit_complete, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 272 | .xmit = rds_tcp_xmit, |
| 273 | .recv = rds_tcp_recv, |
| 274 | .conn_alloc = rds_tcp_conn_alloc, |
| 275 | .conn_free = rds_tcp_conn_free, |
| 276 | .conn_connect = rds_tcp_conn_connect, |
| 277 | .conn_shutdown = rds_tcp_conn_shutdown, |
| 278 | .inc_copy_to_user = rds_tcp_inc_copy_to_user, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 279 | .inc_free = rds_tcp_inc_free, |
| 280 | .stats_info_copy = rds_tcp_stats_info_copy, |
| 281 | .exit = rds_tcp_exit, |
| 282 | .t_owner = THIS_MODULE, |
| 283 | .t_name = "tcp", |
Andy Grover | 335776b | 2009-08-21 12:28:34 +0000 | [diff] [blame] | 284 | .t_type = RDS_TRANS_TCP, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 285 | .t_prefer_loopback = 1, |
| 286 | }; |
| 287 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 288 | static int rds_tcp_netid; |
| 289 | |
| 290 | /* per-network namespace private data for this module */ |
| 291 | struct rds_tcp_net { |
| 292 | struct socket *rds_tcp_listen_sock; |
| 293 | struct work_struct rds_tcp_accept_w; |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 294 | struct ctl_table_header *rds_tcp_sysctl; |
| 295 | struct ctl_table *ctl_table; |
| 296 | int sndbuf_size; |
| 297 | int rcvbuf_size; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 298 | }; |
| 299 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 300 | /* All module specific customizations to the RDS-TCP socket should be done in |
| 301 | * rds_tcp_tune() and applied after socket creation. |
| 302 | */ |
| 303 | void rds_tcp_tune(struct socket *sock) |
| 304 | { |
| 305 | struct sock *sk = sock->sk; |
| 306 | struct net *net = sock_net(sk); |
| 307 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 308 | |
| 309 | rds_tcp_nonagle(sock); |
| 310 | lock_sock(sk); |
| 311 | if (rtn->sndbuf_size > 0) { |
| 312 | sk->sk_sndbuf = rtn->sndbuf_size; |
| 313 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| 314 | } |
| 315 | if (rtn->rcvbuf_size > 0) { |
| 316 | sk->sk_sndbuf = rtn->rcvbuf_size; |
| 317 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 318 | } |
| 319 | release_sock(sk); |
| 320 | } |
| 321 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 322 | static void rds_tcp_accept_worker(struct work_struct *work) |
| 323 | { |
| 324 | struct rds_tcp_net *rtn = container_of(work, |
| 325 | struct rds_tcp_net, |
| 326 | rds_tcp_accept_w); |
| 327 | |
| 328 | while (rds_tcp_accept_one(rtn->rds_tcp_listen_sock) == 0) |
| 329 | cond_resched(); |
| 330 | } |
| 331 | |
| 332 | void rds_tcp_accept_work(struct sock *sk) |
| 333 | { |
| 334 | struct net *net = sock_net(sk); |
| 335 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 336 | |
| 337 | queue_work(rds_wq, &rtn->rds_tcp_accept_w); |
| 338 | } |
| 339 | |
| 340 | static __net_init int rds_tcp_init_net(struct net *net) |
| 341 | { |
| 342 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 343 | struct ctl_table *tbl; |
| 344 | int err = 0; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 345 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 346 | memset(rtn, 0, sizeof(*rtn)); |
| 347 | |
| 348 | /* {snd, rcv}buf_size default to 0, which implies we let the |
| 349 | * stack pick the value, and permit auto-tuning of buffer size. |
| 350 | */ |
| 351 | if (net == &init_net) { |
| 352 | tbl = rds_tcp_sysctl_table; |
| 353 | } else { |
| 354 | tbl = kmemdup(rds_tcp_sysctl_table, |
| 355 | sizeof(rds_tcp_sysctl_table), GFP_KERNEL); |
| 356 | if (!tbl) { |
| 357 | pr_warn("could not set allocate syctl table\n"); |
| 358 | return -ENOMEM; |
| 359 | } |
| 360 | rtn->ctl_table = tbl; |
| 361 | } |
| 362 | tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size; |
| 363 | tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size; |
| 364 | rtn->rds_tcp_sysctl = register_net_sysctl(net, "net/rds/tcp", tbl); |
| 365 | if (!rtn->rds_tcp_sysctl) { |
| 366 | pr_warn("could not register sysctl\n"); |
| 367 | err = -ENOMEM; |
| 368 | goto fail; |
| 369 | } |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 370 | rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net); |
| 371 | if (!rtn->rds_tcp_listen_sock) { |
| 372 | pr_warn("could not set up listen sock\n"); |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 373 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); |
| 374 | rtn->rds_tcp_sysctl = NULL; |
| 375 | err = -EAFNOSUPPORT; |
| 376 | goto fail; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 377 | } |
| 378 | INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker); |
| 379 | return 0; |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 380 | |
| 381 | fail: |
| 382 | if (net != &init_net) |
| 383 | kfree(tbl); |
| 384 | return err; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 385 | } |
| 386 | |
| 387 | static void __net_exit rds_tcp_exit_net(struct net *net) |
| 388 | { |
| 389 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 390 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 391 | if (rtn->rds_tcp_sysctl) |
| 392 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); |
| 393 | |
| 394 | if (net != &init_net && rtn->ctl_table) |
| 395 | kfree(rtn->ctl_table); |
| 396 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 397 | /* If rds_tcp_exit_net() is called as a result of netns deletion, |
| 398 | * the rds_tcp_kill_sock() device notifier would already have cleaned |
| 399 | * up the listen socket, thus there is no work to do in this function. |
| 400 | * |
| 401 | * If rds_tcp_exit_net() is called as a result of module unload, |
| 402 | * i.e., due to rds_tcp_exit() -> unregister_pernet_subsys(), then |
| 403 | * we do need to clean up the listen socket here. |
| 404 | */ |
| 405 | if (rtn->rds_tcp_listen_sock) { |
| 406 | rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); |
| 407 | rtn->rds_tcp_listen_sock = NULL; |
| 408 | flush_work(&rtn->rds_tcp_accept_w); |
| 409 | } |
| 410 | } |
| 411 | |
| 412 | static struct pernet_operations rds_tcp_net_ops = { |
| 413 | .init = rds_tcp_init_net, |
| 414 | .exit = rds_tcp_exit_net, |
| 415 | .id = &rds_tcp_netid, |
| 416 | .size = sizeof(struct rds_tcp_net), |
| 417 | }; |
| 418 | |
| 419 | static void rds_tcp_kill_sock(struct net *net) |
| 420 | { |
| 421 | struct rds_tcp_connection *tc, *_tc; |
| 422 | struct sock *sk; |
| 423 | LIST_HEAD(tmp_list); |
| 424 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 425 | |
| 426 | rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); |
| 427 | rtn->rds_tcp_listen_sock = NULL; |
| 428 | flush_work(&rtn->rds_tcp_accept_w); |
| 429 | spin_lock_irq(&rds_tcp_conn_lock); |
| 430 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { |
| 431 | struct net *c_net = read_pnet(&tc->conn->c_net); |
| 432 | |
| 433 | if (net != c_net || !tc->t_sock) |
| 434 | continue; |
| 435 | list_move_tail(&tc->t_tcp_node, &tmp_list); |
| 436 | } |
| 437 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 438 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { |
| 439 | sk = tc->t_sock->sk; |
| 440 | sk->sk_prot->disconnect(sk, 0); |
| 441 | tcp_done(sk); |
| 442 | if (tc->conn->c_passive) |
| 443 | rds_conn_destroy(tc->conn->c_passive); |
| 444 | rds_conn_destroy(tc->conn); |
| 445 | } |
| 446 | } |
| 447 | |
| 448 | static int rds_tcp_dev_event(struct notifier_block *this, |
| 449 | unsigned long event, void *ptr) |
| 450 | { |
| 451 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 452 | |
| 453 | /* rds-tcp registers as a pernet subys, so the ->exit will only |
| 454 | * get invoked after network acitivity has quiesced. We need to |
| 455 | * clean up all sockets to quiesce network activity, and use |
| 456 | * the unregistration of the per-net loopback device as a trigger |
| 457 | * to start that cleanup. |
| 458 | */ |
| 459 | if (event == NETDEV_UNREGISTER_FINAL && |
| 460 | dev->ifindex == LOOPBACK_IFINDEX) |
| 461 | rds_tcp_kill_sock(dev_net(dev)); |
| 462 | |
| 463 | return NOTIFY_DONE; |
| 464 | } |
| 465 | |
| 466 | static struct notifier_block rds_tcp_dev_notifier = { |
| 467 | .notifier_call = rds_tcp_dev_event, |
| 468 | .priority = -10, /* must be called after other network notifiers */ |
| 469 | }; |
| 470 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 471 | /* when sysctl is used to modify some kernel socket parameters,this |
| 472 | * function resets the RDS connections in that netns so that we can |
| 473 | * restart with new parameters. The assumption is that such reset |
| 474 | * events are few and far-between. |
| 475 | */ |
| 476 | static void rds_tcp_sysctl_reset(struct net *net) |
| 477 | { |
| 478 | struct rds_tcp_connection *tc, *_tc; |
| 479 | |
| 480 | spin_lock_irq(&rds_tcp_conn_lock); |
| 481 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { |
| 482 | struct net *c_net = read_pnet(&tc->conn->c_net); |
| 483 | |
| 484 | if (net != c_net || !tc->t_sock) |
| 485 | continue; |
| 486 | |
| 487 | rds_conn_drop(tc->conn); /* reconnect with new parameters */ |
| 488 | } |
| 489 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 490 | } |
| 491 | |
| 492 | static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write, |
| 493 | void __user *buffer, size_t *lenp, |
| 494 | loff_t *fpos) |
| 495 | { |
| 496 | struct net *net = current->nsproxy->net_ns; |
| 497 | int err; |
| 498 | |
| 499 | err = proc_dointvec_minmax(ctl, write, buffer, lenp, fpos); |
| 500 | if (err < 0) { |
| 501 | pr_warn("Invalid input. Must be >= %d\n", |
| 502 | *(int *)(ctl->extra1)); |
| 503 | return err; |
| 504 | } |
| 505 | if (write) |
| 506 | rds_tcp_sysctl_reset(net); |
| 507 | return 0; |
| 508 | } |
| 509 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 510 | static void rds_tcp_exit(void) |
| 511 | { |
| 512 | rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); |
| 513 | unregister_pernet_subsys(&rds_tcp_net_ops); |
| 514 | if (unregister_netdevice_notifier(&rds_tcp_dev_notifier)) |
| 515 | pr_warn("could not unregister rds_tcp_dev_notifier\n"); |
| 516 | rds_tcp_destroy_conns(); |
| 517 | rds_trans_unregister(&rds_tcp_transport); |
| 518 | rds_tcp_recv_exit(); |
| 519 | kmem_cache_destroy(rds_tcp_conn_slab); |
| 520 | } |
| 521 | module_exit(rds_tcp_exit); |
| 522 | |
stephen hemminger | ff51bf8 | 2010-10-19 08:08:33 +0000 | [diff] [blame] | 523 | static int rds_tcp_init(void) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 524 | { |
| 525 | int ret; |
| 526 | |
| 527 | rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection", |
| 528 | sizeof(struct rds_tcp_connection), |
| 529 | 0, 0, NULL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 530 | if (!rds_tcp_conn_slab) { |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 531 | ret = -ENOMEM; |
| 532 | goto out; |
| 533 | } |
| 534 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 535 | ret = register_netdevice_notifier(&rds_tcp_dev_notifier); |
| 536 | if (ret) { |
| 537 | pr_warn("could not register rds_tcp_dev_notifier\n"); |
| 538 | goto out; |
| 539 | } |
| 540 | |
| 541 | ret = register_pernet_subsys(&rds_tcp_net_ops); |
| 542 | if (ret) |
| 543 | goto out_slab; |
| 544 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 545 | ret = rds_tcp_recv_init(); |
| 546 | if (ret) |
| 547 | goto out_slab; |
| 548 | |
| 549 | ret = rds_trans_register(&rds_tcp_transport); |
| 550 | if (ret) |
| 551 | goto out_recv; |
| 552 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 553 | rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); |
| 554 | |
| 555 | goto out; |
| 556 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 557 | out_recv: |
| 558 | rds_tcp_recv_exit(); |
| 559 | out_slab: |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 560 | unregister_pernet_subsys(&rds_tcp_net_ops); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 561 | kmem_cache_destroy(rds_tcp_conn_slab); |
| 562 | out: |
| 563 | return ret; |
| 564 | } |
| 565 | module_init(rds_tcp_init); |
| 566 | |
| 567 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); |
| 568 | MODULE_DESCRIPTION("RDS: TCP transport"); |
| 569 | MODULE_LICENSE("Dual BSD/GPL"); |
| 570 | |