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 | |
Wei Yongjun | af73e72 | 2016-06-17 18:12:46 +0000 | [diff] [blame] | 59 | static int rds_tcp_min_sndbuf = SOCK_MIN_SNDBUF; |
| 60 | static int rds_tcp_min_rcvbuf = SOCK_MIN_RCVBUF; |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 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 | /* |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 129 | * rds_tcp_reset_callbacks() switches the to the new sock and |
| 130 | * returns the existing tc->t_sock. |
| 131 | * |
| 132 | * The only functions that set tc->t_sock are rds_tcp_set_callbacks |
| 133 | * and rds_tcp_reset_callbacks. Send and receive trust that |
| 134 | * it is set. The absence of RDS_CONN_UP bit protects those paths |
| 135 | * from being called while it isn't set. |
| 136 | */ |
| 137 | void rds_tcp_reset_callbacks(struct socket *sock, |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 138 | struct rds_conn_path *cp) |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 139 | { |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 140 | struct rds_tcp_connection *tc = cp->cp_transport_data; |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 141 | struct socket *osock = tc->t_sock; |
| 142 | |
| 143 | if (!osock) |
| 144 | goto newsock; |
| 145 | |
| 146 | /* Need to resolve a duelling SYN between peers. |
| 147 | * We have an outstanding SYN to this peer, which may |
| 148 | * potentially have transitioned to the RDS_CONN_UP state, |
| 149 | * so we must quiesce any send threads before resetting |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 150 | * cp_transport_data. We quiesce these threads by setting |
| 151 | * cp_state to something other than RDS_CONN_UP, and then |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 152 | * waiting for any existing threads in rds_send_xmit to |
| 153 | * complete release_in_xmit(). (Subsequent threads entering |
| 154 | * rds_send_xmit() will bail on !rds_conn_up(). |
Sowmini Varadhan | 9c79440 | 2016-06-04 14:00:00 -0700 | [diff] [blame] | 155 | * |
| 156 | * However an incoming syn-ack at this point would end up |
| 157 | * marking the conn as RDS_CONN_UP, and would again permit |
| 158 | * rds_send_xmi() threads through, so ideally we would |
| 159 | * synchronize on RDS_CONN_UP after lock_sock(), but cannot |
| 160 | * do that: waiting on !RDS_IN_XMIT after lock_sock() may |
| 161 | * end up deadlocking with tcp_sendmsg(), and the RDS_IN_XMIT |
| 162 | * would not get set. As a result, we set c_state to |
| 163 | * RDS_CONN_RESETTTING, to ensure that rds_tcp_state_change |
| 164 | * cannot mark rds_conn_path_up() in the window before lock_sock() |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 165 | */ |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 166 | atomic_set(&cp->cp_state, RDS_CONN_RESETTING); |
| 167 | wait_event(cp->cp_waitq, !test_bit(RDS_IN_XMIT, &cp->cp_flags)); |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 168 | lock_sock(osock->sk); |
| 169 | /* reset receive side state for rds_tcp_data_recv() for osock */ |
Sowmini Varadhan | ac3615e | 2016-07-14 03:51:02 -0700 | [diff] [blame] | 170 | cancel_delayed_work_sync(&cp->cp_send_w); |
| 171 | cancel_delayed_work_sync(&cp->cp_recv_w); |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 172 | if (tc->t_tinc) { |
| 173 | rds_inc_put(&tc->t_tinc->ti_inc); |
| 174 | tc->t_tinc = NULL; |
| 175 | } |
| 176 | tc->t_tinc_hdr_rem = sizeof(struct rds_header); |
| 177 | tc->t_tinc_data_rem = 0; |
Sowmini Varadhan | ac3615e | 2016-07-14 03:51:02 -0700 | [diff] [blame] | 178 | rds_tcp_restore_callbacks(osock, tc); |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 179 | release_sock(osock->sk); |
| 180 | sock_release(osock); |
| 181 | newsock: |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 182 | rds_send_path_reset(cp); |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 183 | lock_sock(sock->sk); |
Sowmini Varadhan | ac3615e | 2016-07-14 03:51:02 -0700 | [diff] [blame] | 184 | rds_tcp_set_callbacks(sock, cp); |
Sowmini Varadhan | 335b48d | 2016-06-04 13:59:58 -0700 | [diff] [blame] | 185 | release_sock(sock->sk); |
| 186 | } |
| 187 | |
| 188 | /* Add tc to rds_tcp_tc_list and set tc->t_sock. See comments |
| 189 | * above rds_tcp_reset_callbacks for notes about synchronization |
| 190 | * with data path |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 191 | */ |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 192 | void rds_tcp_set_callbacks(struct socket *sock, struct rds_conn_path *cp) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 193 | { |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 194 | struct rds_tcp_connection *tc = cp->cp_transport_data; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 195 | |
| 196 | rdsdebug("setting sock %p callbacks to tc %p\n", sock, tc); |
| 197 | write_lock_bh(&sock->sk->sk_callback_lock); |
| 198 | |
| 199 | /* done under the callback_lock to serialize with write_space */ |
| 200 | spin_lock(&rds_tcp_tc_list_lock); |
| 201 | list_add_tail(&tc->t_list_item, &rds_tcp_tc_list); |
| 202 | rds_tcp_tc_count++; |
| 203 | spin_unlock(&rds_tcp_tc_list_lock); |
| 204 | |
| 205 | /* accepted sockets need our listen data ready undone */ |
| 206 | if (sock->sk->sk_data_ready == rds_tcp_listen_data_ready) |
| 207 | sock->sk->sk_data_ready = sock->sk->sk_user_data; |
| 208 | |
| 209 | tc->t_sock = sock; |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 210 | tc->t_cpath = cp; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 211 | tc->t_orig_data_ready = sock->sk->sk_data_ready; |
| 212 | tc->t_orig_write_space = sock->sk->sk_write_space; |
| 213 | tc->t_orig_state_change = sock->sk->sk_state_change; |
| 214 | |
Sowmini Varadhan | ea3b1ea | 2016-06-30 16:11:14 -0700 | [diff] [blame] | 215 | sock->sk->sk_user_data = cp; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 216 | sock->sk->sk_data_ready = rds_tcp_data_ready; |
| 217 | sock->sk->sk_write_space = rds_tcp_write_space; |
| 218 | sock->sk->sk_state_change = rds_tcp_state_change; |
| 219 | |
| 220 | write_unlock_bh(&sock->sk->sk_callback_lock); |
| 221 | } |
| 222 | |
| 223 | static void rds_tcp_tc_info(struct socket *sock, unsigned int len, |
| 224 | struct rds_info_iterator *iter, |
| 225 | struct rds_info_lengths *lens) |
| 226 | { |
| 227 | struct rds_info_tcp_socket tsinfo; |
| 228 | struct rds_tcp_connection *tc; |
| 229 | unsigned long flags; |
| 230 | struct sockaddr_in sin; |
| 231 | int sinlen; |
| 232 | |
| 233 | spin_lock_irqsave(&rds_tcp_tc_list_lock, flags); |
| 234 | |
| 235 | if (len / sizeof(tsinfo) < rds_tcp_tc_count) |
| 236 | goto out; |
| 237 | |
| 238 | list_for_each_entry(tc, &rds_tcp_tc_list, t_list_item) { |
| 239 | |
| 240 | sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 0); |
| 241 | tsinfo.local_addr = sin.sin_addr.s_addr; |
| 242 | tsinfo.local_port = sin.sin_port; |
| 243 | sock->ops->getname(sock, (struct sockaddr *)&sin, &sinlen, 1); |
| 244 | tsinfo.peer_addr = sin.sin_addr.s_addr; |
| 245 | tsinfo.peer_port = sin.sin_port; |
| 246 | |
| 247 | tsinfo.hdr_rem = tc->t_tinc_hdr_rem; |
| 248 | tsinfo.data_rem = tc->t_tinc_data_rem; |
| 249 | tsinfo.last_sent_nxt = tc->t_last_sent_nxt; |
| 250 | tsinfo.last_expected_una = tc->t_last_expected_una; |
| 251 | tsinfo.last_seen_una = tc->t_last_seen_una; |
| 252 | |
| 253 | rds_info_copy(iter, &tsinfo, sizeof(tsinfo)); |
| 254 | } |
| 255 | |
| 256 | out: |
| 257 | lens->nr = rds_tcp_tc_count; |
| 258 | lens->each = sizeof(tsinfo); |
| 259 | |
| 260 | spin_unlock_irqrestore(&rds_tcp_tc_list_lock, flags); |
| 261 | } |
| 262 | |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 263 | static int rds_tcp_laddr_check(struct net *net, __be32 addr) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 264 | { |
Sowmini Varadhan | d5a8ac2 | 2015-08-05 01:43:25 -0400 | [diff] [blame] | 265 | if (inet_addr_type(net, addr) == RTN_LOCAL) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 266 | return 0; |
| 267 | return -EADDRNOTAVAIL; |
| 268 | } |
| 269 | |
| 270 | static int rds_tcp_conn_alloc(struct rds_connection *conn, gfp_t gfp) |
| 271 | { |
| 272 | struct rds_tcp_connection *tc; |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 273 | int i; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 274 | |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 275 | for (i = 0; i < RDS_MPATH_WORKERS; i++) { |
| 276 | tc = kmem_cache_alloc(rds_tcp_conn_slab, gfp); |
| 277 | if (!tc) |
| 278 | return -ENOMEM; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 279 | |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 280 | mutex_init(&tc->t_conn_path_lock); |
| 281 | tc->t_sock = NULL; |
| 282 | tc->t_tinc = NULL; |
| 283 | tc->t_tinc_hdr_rem = sizeof(struct rds_header); |
| 284 | tc->t_tinc_data_rem = 0; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 285 | |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 286 | conn->c_path[i].cp_transport_data = tc; |
| 287 | tc->t_cpath = &conn->c_path[i]; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 288 | |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 289 | spin_lock_irq(&rds_tcp_conn_lock); |
| 290 | list_add_tail(&tc->t_tcp_node, &rds_tcp_conn_list); |
| 291 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 292 | rdsdebug("rds_conn_path [%d] tc %p\n", i, |
| 293 | conn->c_path[i].cp_transport_data); |
| 294 | } |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 295 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | static void rds_tcp_conn_free(void *arg) |
| 300 | { |
| 301 | struct rds_tcp_connection *tc = arg; |
Pavel Emelyanov | 8200a59 | 2010-11-02 01:54:01 +0000 | [diff] [blame] | 302 | unsigned long flags; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 303 | rdsdebug("freeing tc %p\n", tc); |
Pavel Emelyanov | 8200a59 | 2010-11-02 01:54:01 +0000 | [diff] [blame] | 304 | |
| 305 | spin_lock_irqsave(&rds_tcp_conn_lock, flags); |
| 306 | list_del(&tc->t_tcp_node); |
| 307 | spin_unlock_irqrestore(&rds_tcp_conn_lock, flags); |
| 308 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 309 | kmem_cache_free(rds_tcp_conn_slab, tc); |
| 310 | } |
| 311 | |
Sowmini Varadhan | afb4164 | 2016-06-30 16:11:13 -0700 | [diff] [blame] | 312 | static bool list_has_conn(struct list_head *list, struct rds_connection *conn) |
| 313 | { |
| 314 | struct rds_tcp_connection *tc, *_tc; |
| 315 | |
| 316 | list_for_each_entry_safe(tc, _tc, list, t_tcp_node) { |
| 317 | if (tc->t_cpath->cp_conn == conn) |
| 318 | return true; |
| 319 | } |
| 320 | return false; |
| 321 | } |
| 322 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 323 | static void rds_tcp_destroy_conns(void) |
| 324 | { |
| 325 | struct rds_tcp_connection *tc, *_tc; |
| 326 | LIST_HEAD(tmp_list); |
| 327 | |
| 328 | /* avoid calling conn_destroy with irqs off */ |
| 329 | spin_lock_irq(&rds_tcp_conn_lock); |
Sowmini Varadhan | afb4164 | 2016-06-30 16:11:13 -0700 | [diff] [blame] | 330 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { |
| 331 | if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn)) |
| 332 | list_move_tail(&tc->t_tcp_node, &tmp_list); |
| 333 | } |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 334 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 335 | |
Sowmini Varadhan | 26e4e6b | 2016-06-30 16:11:11 -0700 | [diff] [blame] | 336 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 337 | rds_conn_destroy(tc->t_cpath->cp_conn); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 338 | } |
| 339 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 340 | static void rds_tcp_exit(void); |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 341 | |
| 342 | struct rds_transport rds_tcp_transport = { |
| 343 | .laddr_check = rds_tcp_laddr_check, |
Sowmini Varadhan | 226f7a7 | 2016-06-30 16:11:10 -0700 | [diff] [blame] | 344 | .xmit_path_prepare = rds_tcp_xmit_path_prepare, |
| 345 | .xmit_path_complete = rds_tcp_xmit_path_complete, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 346 | .xmit = rds_tcp_xmit, |
Sowmini Varadhan | 2da43c4 | 2016-06-30 16:11:15 -0700 | [diff] [blame] | 347 | .recv_path = rds_tcp_recv_path, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 348 | .conn_alloc = rds_tcp_conn_alloc, |
| 349 | .conn_free = rds_tcp_conn_free, |
Sowmini Varadhan | b04e855 | 2016-06-30 16:11:16 -0700 | [diff] [blame] | 350 | .conn_path_connect = rds_tcp_conn_path_connect, |
Sowmini Varadhan | 226f7a7 | 2016-06-30 16:11:10 -0700 | [diff] [blame] | 351 | .conn_path_shutdown = rds_tcp_conn_path_shutdown, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 352 | .inc_copy_to_user = rds_tcp_inc_copy_to_user, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 353 | .inc_free = rds_tcp_inc_free, |
| 354 | .stats_info_copy = rds_tcp_stats_info_copy, |
| 355 | .exit = rds_tcp_exit, |
| 356 | .t_owner = THIS_MODULE, |
| 357 | .t_name = "tcp", |
Andy Grover | 335776bd | 2009-08-21 12:28:34 +0000 | [diff] [blame] | 358 | .t_type = RDS_TRANS_TCP, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 359 | .t_prefer_loopback = 1, |
Sowmini Varadhan | 5916e2c | 2016-07-14 03:51:03 -0700 | [diff] [blame] | 360 | .t_mp_capable = 1, |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 361 | }; |
| 362 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 363 | static int rds_tcp_netid; |
| 364 | |
| 365 | /* per-network namespace private data for this module */ |
| 366 | struct rds_tcp_net { |
| 367 | struct socket *rds_tcp_listen_sock; |
| 368 | struct work_struct rds_tcp_accept_w; |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 369 | struct ctl_table_header *rds_tcp_sysctl; |
| 370 | struct ctl_table *ctl_table; |
| 371 | int sndbuf_size; |
| 372 | int rcvbuf_size; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 373 | }; |
| 374 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 375 | /* All module specific customizations to the RDS-TCP socket should be done in |
| 376 | * rds_tcp_tune() and applied after socket creation. |
| 377 | */ |
| 378 | void rds_tcp_tune(struct socket *sock) |
| 379 | { |
| 380 | struct sock *sk = sock->sk; |
| 381 | struct net *net = sock_net(sk); |
| 382 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 383 | |
| 384 | rds_tcp_nonagle(sock); |
| 385 | lock_sock(sk); |
| 386 | if (rtn->sndbuf_size > 0) { |
| 387 | sk->sk_sndbuf = rtn->sndbuf_size; |
| 388 | sk->sk_userlocks |= SOCK_SNDBUF_LOCK; |
| 389 | } |
| 390 | if (rtn->rcvbuf_size > 0) { |
| 391 | sk->sk_sndbuf = rtn->rcvbuf_size; |
| 392 | sk->sk_userlocks |= SOCK_RCVBUF_LOCK; |
| 393 | } |
| 394 | release_sock(sk); |
| 395 | } |
| 396 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 397 | static void rds_tcp_accept_worker(struct work_struct *work) |
| 398 | { |
| 399 | struct rds_tcp_net *rtn = container_of(work, |
| 400 | struct rds_tcp_net, |
| 401 | rds_tcp_accept_w); |
| 402 | |
| 403 | while (rds_tcp_accept_one(rtn->rds_tcp_listen_sock) == 0) |
| 404 | cond_resched(); |
| 405 | } |
| 406 | |
| 407 | void rds_tcp_accept_work(struct sock *sk) |
| 408 | { |
| 409 | struct net *net = sock_net(sk); |
| 410 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 411 | |
| 412 | queue_work(rds_wq, &rtn->rds_tcp_accept_w); |
| 413 | } |
| 414 | |
| 415 | static __net_init int rds_tcp_init_net(struct net *net) |
| 416 | { |
| 417 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 418 | struct ctl_table *tbl; |
| 419 | int err = 0; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 420 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 421 | memset(rtn, 0, sizeof(*rtn)); |
| 422 | |
| 423 | /* {snd, rcv}buf_size default to 0, which implies we let the |
| 424 | * stack pick the value, and permit auto-tuning of buffer size. |
| 425 | */ |
| 426 | if (net == &init_net) { |
| 427 | tbl = rds_tcp_sysctl_table; |
| 428 | } else { |
| 429 | tbl = kmemdup(rds_tcp_sysctl_table, |
| 430 | sizeof(rds_tcp_sysctl_table), GFP_KERNEL); |
| 431 | if (!tbl) { |
| 432 | pr_warn("could not set allocate syctl table\n"); |
| 433 | return -ENOMEM; |
| 434 | } |
| 435 | rtn->ctl_table = tbl; |
| 436 | } |
| 437 | tbl[RDS_TCP_SNDBUF].data = &rtn->sndbuf_size; |
| 438 | tbl[RDS_TCP_RCVBUF].data = &rtn->rcvbuf_size; |
| 439 | rtn->rds_tcp_sysctl = register_net_sysctl(net, "net/rds/tcp", tbl); |
| 440 | if (!rtn->rds_tcp_sysctl) { |
| 441 | pr_warn("could not register sysctl\n"); |
| 442 | err = -ENOMEM; |
| 443 | goto fail; |
| 444 | } |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 445 | rtn->rds_tcp_listen_sock = rds_tcp_listen_init(net); |
| 446 | if (!rtn->rds_tcp_listen_sock) { |
| 447 | pr_warn("could not set up listen sock\n"); |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 448 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); |
| 449 | rtn->rds_tcp_sysctl = NULL; |
| 450 | err = -EAFNOSUPPORT; |
| 451 | goto fail; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 452 | } |
| 453 | INIT_WORK(&rtn->rds_tcp_accept_w, rds_tcp_accept_worker); |
| 454 | return 0; |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 455 | |
| 456 | fail: |
| 457 | if (net != &init_net) |
| 458 | kfree(tbl); |
| 459 | return err; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 460 | } |
| 461 | |
| 462 | static void __net_exit rds_tcp_exit_net(struct net *net) |
| 463 | { |
| 464 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 465 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 466 | if (rtn->rds_tcp_sysctl) |
| 467 | unregister_net_sysctl_table(rtn->rds_tcp_sysctl); |
| 468 | |
| 469 | if (net != &init_net && rtn->ctl_table) |
| 470 | kfree(rtn->ctl_table); |
| 471 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 472 | /* If rds_tcp_exit_net() is called as a result of netns deletion, |
| 473 | * the rds_tcp_kill_sock() device notifier would already have cleaned |
| 474 | * up the listen socket, thus there is no work to do in this function. |
| 475 | * |
| 476 | * If rds_tcp_exit_net() is called as a result of module unload, |
| 477 | * i.e., due to rds_tcp_exit() -> unregister_pernet_subsys(), then |
| 478 | * we do need to clean up the listen socket here. |
| 479 | */ |
| 480 | if (rtn->rds_tcp_listen_sock) { |
| 481 | rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); |
| 482 | rtn->rds_tcp_listen_sock = NULL; |
| 483 | flush_work(&rtn->rds_tcp_accept_w); |
| 484 | } |
| 485 | } |
| 486 | |
| 487 | static struct pernet_operations rds_tcp_net_ops = { |
| 488 | .init = rds_tcp_init_net, |
| 489 | .exit = rds_tcp_exit_net, |
| 490 | .id = &rds_tcp_netid, |
| 491 | .size = sizeof(struct rds_tcp_net), |
| 492 | }; |
| 493 | |
Sowmini Varadhan | afb4164 | 2016-06-30 16:11:13 -0700 | [diff] [blame] | 494 | /* explicitly send a RST on each socket, thereby releasing any socket refcnts |
| 495 | * that may otherwise hold up netns deletion. |
| 496 | */ |
| 497 | static void rds_tcp_conn_paths_destroy(struct rds_connection *conn) |
| 498 | { |
| 499 | struct rds_conn_path *cp; |
| 500 | struct rds_tcp_connection *tc; |
| 501 | int i; |
| 502 | struct sock *sk; |
| 503 | |
| 504 | for (i = 0; i < RDS_MPATH_WORKERS; i++) { |
| 505 | cp = &conn->c_path[i]; |
| 506 | tc = cp->cp_transport_data; |
| 507 | if (!tc->t_sock) |
| 508 | continue; |
| 509 | sk = tc->t_sock->sk; |
| 510 | sk->sk_prot->disconnect(sk, 0); |
| 511 | tcp_done(sk); |
| 512 | } |
| 513 | } |
| 514 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 515 | static void rds_tcp_kill_sock(struct net *net) |
| 516 | { |
| 517 | struct rds_tcp_connection *tc, *_tc; |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 518 | LIST_HEAD(tmp_list); |
| 519 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 520 | |
| 521 | rds_tcp_listen_stop(rtn->rds_tcp_listen_sock); |
| 522 | rtn->rds_tcp_listen_sock = NULL; |
| 523 | flush_work(&rtn->rds_tcp_accept_w); |
| 524 | spin_lock_irq(&rds_tcp_conn_lock); |
| 525 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 526 | struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net); |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 527 | |
| 528 | if (net != c_net || !tc->t_sock) |
| 529 | continue; |
Sowmini Varadhan | afb4164 | 2016-06-30 16:11:13 -0700 | [diff] [blame] | 530 | if (!list_has_conn(&tmp_list, tc->t_cpath->cp_conn)) |
| 531 | list_move_tail(&tc->t_tcp_node, &tmp_list); |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 532 | } |
| 533 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 534 | list_for_each_entry_safe(tc, _tc, &tmp_list, t_tcp_node) { |
Sowmini Varadhan | afb4164 | 2016-06-30 16:11:13 -0700 | [diff] [blame] | 535 | rds_tcp_conn_paths_destroy(tc->t_cpath->cp_conn); |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 536 | rds_conn_destroy(tc->t_cpath->cp_conn); |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 537 | } |
| 538 | } |
| 539 | |
Sowmini Varadhan | a93d01f | 2016-07-14 03:51:01 -0700 | [diff] [blame] | 540 | void *rds_tcp_listen_sock_def_readable(struct net *net) |
| 541 | { |
| 542 | struct rds_tcp_net *rtn = net_generic(net, rds_tcp_netid); |
| 543 | |
| 544 | return rtn->rds_tcp_listen_sock->sk->sk_user_data; |
| 545 | } |
| 546 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 547 | static int rds_tcp_dev_event(struct notifier_block *this, |
| 548 | unsigned long event, void *ptr) |
| 549 | { |
| 550 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| 551 | |
| 552 | /* rds-tcp registers as a pernet subys, so the ->exit will only |
| 553 | * get invoked after network acitivity has quiesced. We need to |
| 554 | * clean up all sockets to quiesce network activity, and use |
| 555 | * the unregistration of the per-net loopback device as a trigger |
| 556 | * to start that cleanup. |
| 557 | */ |
| 558 | if (event == NETDEV_UNREGISTER_FINAL && |
| 559 | dev->ifindex == LOOPBACK_IFINDEX) |
| 560 | rds_tcp_kill_sock(dev_net(dev)); |
| 561 | |
| 562 | return NOTIFY_DONE; |
| 563 | } |
| 564 | |
| 565 | static struct notifier_block rds_tcp_dev_notifier = { |
| 566 | .notifier_call = rds_tcp_dev_event, |
| 567 | .priority = -10, /* must be called after other network notifiers */ |
| 568 | }; |
| 569 | |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 570 | /* when sysctl is used to modify some kernel socket parameters,this |
| 571 | * function resets the RDS connections in that netns so that we can |
| 572 | * restart with new parameters. The assumption is that such reset |
| 573 | * events are few and far-between. |
| 574 | */ |
| 575 | static void rds_tcp_sysctl_reset(struct net *net) |
| 576 | { |
| 577 | struct rds_tcp_connection *tc, *_tc; |
| 578 | |
| 579 | spin_lock_irq(&rds_tcp_conn_lock); |
| 580 | list_for_each_entry_safe(tc, _tc, &rds_tcp_conn_list, t_tcp_node) { |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 581 | struct net *c_net = read_pnet(&tc->t_cpath->cp_conn->c_net); |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 582 | |
| 583 | if (net != c_net || !tc->t_sock) |
| 584 | continue; |
| 585 | |
Sowmini Varadhan | 02105b2 | 2016-06-30 16:11:12 -0700 | [diff] [blame] | 586 | /* reconnect with new parameters */ |
| 587 | rds_conn_path_drop(tc->t_cpath); |
Sowmini Varadhan | c6a58ff | 2016-03-16 11:38:12 -0700 | [diff] [blame] | 588 | } |
| 589 | spin_unlock_irq(&rds_tcp_conn_lock); |
| 590 | } |
| 591 | |
| 592 | static int rds_tcp_skbuf_handler(struct ctl_table *ctl, int write, |
| 593 | void __user *buffer, size_t *lenp, |
| 594 | loff_t *fpos) |
| 595 | { |
| 596 | struct net *net = current->nsproxy->net_ns; |
| 597 | int err; |
| 598 | |
| 599 | err = proc_dointvec_minmax(ctl, write, buffer, lenp, fpos); |
| 600 | if (err < 0) { |
| 601 | pr_warn("Invalid input. Must be >= %d\n", |
| 602 | *(int *)(ctl->extra1)); |
| 603 | return err; |
| 604 | } |
| 605 | if (write) |
| 606 | rds_tcp_sysctl_reset(net); |
| 607 | return 0; |
| 608 | } |
| 609 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 610 | static void rds_tcp_exit(void) |
| 611 | { |
| 612 | rds_info_deregister_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); |
| 613 | unregister_pernet_subsys(&rds_tcp_net_ops); |
| 614 | if (unregister_netdevice_notifier(&rds_tcp_dev_notifier)) |
| 615 | pr_warn("could not unregister rds_tcp_dev_notifier\n"); |
| 616 | rds_tcp_destroy_conns(); |
| 617 | rds_trans_unregister(&rds_tcp_transport); |
| 618 | rds_tcp_recv_exit(); |
| 619 | kmem_cache_destroy(rds_tcp_conn_slab); |
| 620 | } |
| 621 | module_exit(rds_tcp_exit); |
| 622 | |
stephen hemminger | ff51bf8 | 2010-10-19 08:08:33 +0000 | [diff] [blame] | 623 | static int rds_tcp_init(void) |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 624 | { |
| 625 | int ret; |
| 626 | |
| 627 | rds_tcp_conn_slab = kmem_cache_create("rds_tcp_connection", |
| 628 | sizeof(struct rds_tcp_connection), |
| 629 | 0, 0, NULL); |
Andy Grover | 8690bfa | 2010-01-12 11:56:44 -0800 | [diff] [blame] | 630 | if (!rds_tcp_conn_slab) { |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 631 | ret = -ENOMEM; |
| 632 | goto out; |
| 633 | } |
| 634 | |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 635 | ret = register_netdevice_notifier(&rds_tcp_dev_notifier); |
| 636 | if (ret) { |
| 637 | pr_warn("could not register rds_tcp_dev_notifier\n"); |
| 638 | goto out; |
| 639 | } |
| 640 | |
| 641 | ret = register_pernet_subsys(&rds_tcp_net_ops); |
| 642 | if (ret) |
| 643 | goto out_slab; |
| 644 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 645 | ret = rds_tcp_recv_init(); |
| 646 | if (ret) |
Vegard Nossum | 3dad542 | 2016-07-03 10:54:54 +0200 | [diff] [blame] | 647 | goto out_pernet; |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 648 | |
| 649 | ret = rds_trans_register(&rds_tcp_transport); |
| 650 | if (ret) |
| 651 | goto out_recv; |
| 652 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 653 | rds_info_register_func(RDS_INFO_TCP_SOCKETS, rds_tcp_tc_info); |
| 654 | |
| 655 | goto out; |
| 656 | |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 657 | out_recv: |
| 658 | rds_tcp_recv_exit(); |
Vegard Nossum | 3dad542 | 2016-07-03 10:54:54 +0200 | [diff] [blame] | 659 | out_pernet: |
Sowmini Varadhan | 467fa15 | 2015-08-05 01:43:26 -0400 | [diff] [blame] | 660 | unregister_pernet_subsys(&rds_tcp_net_ops); |
Vegard Nossum | 3dad542 | 2016-07-03 10:54:54 +0200 | [diff] [blame] | 661 | out_slab: |
Andy Grover | 7004108 | 2009-08-21 12:28:31 +0000 | [diff] [blame] | 662 | kmem_cache_destroy(rds_tcp_conn_slab); |
| 663 | out: |
| 664 | return ret; |
| 665 | } |
| 666 | module_init(rds_tcp_init); |
| 667 | |
| 668 | MODULE_AUTHOR("Oracle Corporation <rds-devel@oss.oracle.com>"); |
| 669 | MODULE_DESCRIPTION("RDS: TCP transport"); |
| 670 | MODULE_LICENSE("Dual BSD/GPL"); |
| 671 | |