Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * Support for INET connection oriented protocols. |
| 7 | * |
| 8 | * Authors: See the TCP sources |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * as published by the Free Software Foundation; either version |
| 13 | * 2 of the License, or(at your option) any later version. |
| 14 | */ |
| 15 | |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 16 | #include <linux/module.h> |
| 17 | #include <linux/jhash.h> |
| 18 | |
| 19 | #include <net/inet_connection_sock.h> |
| 20 | #include <net/inet_hashtables.h> |
| 21 | #include <net/inet_timewait_sock.h> |
| 22 | #include <net/ip.h> |
| 23 | #include <net/route.h> |
| 24 | #include <net/tcp_states.h> |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 25 | #include <net/xfrm.h> |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 26 | #include <net/tcp.h> |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 27 | |
| 28 | #ifdef INET_CSK_DEBUG |
| 29 | const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n"; |
| 30 | EXPORT_SYMBOL(inet_csk_timer_bug_msg); |
| 31 | #endif |
| 32 | |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 33 | void inet_get_local_port_range(struct net *net, int *low, int *high) |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 34 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 35 | unsigned int seq; |
| 36 | |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 37 | do { |
Cong Wang | c9d8f1a | 2014-05-06 11:02:49 -0700 | [diff] [blame] | 38 | seq = read_seqbegin(&net->ipv4.ip_local_ports.lock); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 39 | |
Cong Wang | c9d8f1a | 2014-05-06 11:02:49 -0700 | [diff] [blame] | 40 | *low = net->ipv4.ip_local_ports.range[0]; |
| 41 | *high = net->ipv4.ip_local_ports.range[1]; |
| 42 | } while (read_seqretry(&net->ipv4.ip_local_ports.lock, seq)); |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 43 | } |
| 44 | EXPORT_SYMBOL(inet_get_local_port_range); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 45 | |
Arnaldo Carvalho de Melo | 971af18 | 2005-12-13 23:14:47 -0800 | [diff] [blame] | 46 | int inet_csk_bind_conflict(const struct sock *sk, |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 47 | const struct inet_bind_bucket *tb, bool relax) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 48 | { |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 49 | struct sock *sk2; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 50 | int reuse = sk->sk_reuse; |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 51 | int reuseport = sk->sk_reuseport; |
| 52 | kuid_t uid = sock_i_uid((struct sock *)sk); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 53 | |
Pavel Emelyanov | 7477fd2e | 2008-04-14 02:42:27 -0700 | [diff] [blame] | 54 | /* |
| 55 | * Unlike other sk lookup places we do not check |
| 56 | * for sk_net here, since _all_ the socks listed |
| 57 | * in tb->owners list belong to the same net - the |
| 58 | * one this bucket belongs to. |
| 59 | */ |
| 60 | |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 61 | sk_for_each_bound(sk2, &tb->owners) { |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 62 | if (sk != sk2 && |
| 63 | !inet_v6_ipv6only(sk2) && |
| 64 | (!sk->sk_bound_dev_if || |
| 65 | !sk2->sk_bound_dev_if || |
| 66 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 67 | if ((!reuse || !sk2->sk_reuse || |
| 68 | sk2->sk_state == TCP_LISTEN) && |
| 69 | (!reuseport || !sk2->sk_reuseport || |
| 70 | (sk2->sk_state != TCP_TIME_WAIT && |
| 71 | !uid_eq(uid, sock_i_uid(sk2))))) { |
Eric Dumazet | 5080546 | 2013-10-02 04:29:50 -0700 | [diff] [blame] | 72 | |
| 73 | if (!sk2->sk_rcv_saddr || !sk->sk_rcv_saddr || |
| 74 | sk2->sk_rcv_saddr == sk->sk_rcv_saddr) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 75 | break; |
David S. Miller | 8d238b2 | 2010-04-28 11:25:59 -0700 | [diff] [blame] | 76 | } |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 77 | if (!relax && reuse && sk2->sk_reuse && |
| 78 | sk2->sk_state != TCP_LISTEN) { |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 79 | |
Eric Dumazet | 5080546 | 2013-10-02 04:29:50 -0700 | [diff] [blame] | 80 | if (!sk2->sk_rcv_saddr || !sk->sk_rcv_saddr || |
| 81 | sk2->sk_rcv_saddr == sk->sk_rcv_saddr) |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 82 | break; |
| 83 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 84 | } |
| 85 | } |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 86 | return sk2 != NULL; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 87 | } |
Arnaldo Carvalho de Melo | 971af18 | 2005-12-13 23:14:47 -0800 | [diff] [blame] | 88 | EXPORT_SYMBOL_GPL(inet_csk_bind_conflict); |
| 89 | |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 90 | /* Obtain a reference to a local port for the given sock, |
| 91 | * if snum is zero it means select any available local port. |
| 92 | */ |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 93 | int inet_csk_get_port(struct sock *sk, unsigned short snum) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 94 | { |
Pavel Emelyanov | 39d8cda | 2008-03-22 16:50:58 -0700 | [diff] [blame] | 95 | struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 96 | struct inet_bind_hashbucket *head; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 97 | struct inet_bind_bucket *tb; |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 98 | int ret, attempts = 5; |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 99 | struct net *net = sock_net(sk); |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 100 | int smallest_size = -1, smallest_rover; |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 101 | kuid_t uid = sock_i_uid(sk); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 102 | |
| 103 | local_bh_disable(); |
| 104 | if (!snum) { |
Stephen Hemminger | 227b60f | 2007-10-10 17:30:46 -0700 | [diff] [blame] | 105 | int remaining, rover, low, high; |
| 106 | |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 107 | again: |
Eric W. Biederman | 0bbf87d | 2013-09-28 14:10:59 -0700 | [diff] [blame] | 108 | inet_get_local_port_range(net, &low, &high); |
Anton Arapov | a25de53 | 2007-10-18 22:00:17 -0700 | [diff] [blame] | 109 | remaining = (high - low) + 1; |
Aruna-Hewapathirane | 63862b5 | 2014-01-11 07:15:59 -0500 | [diff] [blame] | 110 | smallest_rover = rover = prandom_u32() % remaining + low; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 111 | |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 112 | smallest_size = -1; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 113 | do { |
WANG Cong | 122ff24 | 2014-05-12 16:04:53 -0700 | [diff] [blame] | 114 | if (inet_is_local_reserved_port(net, rover)) |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 115 | goto next_nolock; |
Pavel Emelyanov | 7f635ab | 2008-06-16 17:12:49 -0700 | [diff] [blame] | 116 | head = &hashinfo->bhash[inet_bhashfn(net, rover, |
| 117 | hashinfo->bhash_size)]; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 118 | spin_lock(&head->lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 119 | inet_bind_bucket_for_each(tb, &head->chain) |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 120 | if (net_eq(ib_net(tb), net) && tb->port == rover) { |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 121 | if (((tb->fastreuse > 0 && |
| 122 | sk->sk_reuse && |
| 123 | sk->sk_state != TCP_LISTEN) || |
| 124 | (tb->fastreuseport > 0 && |
| 125 | sk->sk_reuseport && |
| 126 | uid_eq(tb->fastuid, uid))) && |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 127 | (tb->num_owners < smallest_size || smallest_size == -1)) { |
| 128 | smallest_size = tb->num_owners; |
| 129 | smallest_rover = rover; |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 130 | if (atomic_read(&hashinfo->bsockets) > (high - low) + 1 && |
| 131 | !inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, false)) { |
David S. Miller | 8d238b2 | 2010-04-28 11:25:59 -0700 | [diff] [blame] | 132 | snum = smallest_rover; |
Flavio Leitner | fddb7b5 | 2012-01-25 08:34:52 +0000 | [diff] [blame] | 133 | goto tb_found; |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 134 | } |
| 135 | } |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 136 | if (!inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, false)) { |
Flavio Leitner | 2b05ad3 | 2012-01-25 08:34:51 +0000 | [diff] [blame] | 137 | snum = rover; |
Flavio Leitner | fddb7b5 | 2012-01-25 08:34:52 +0000 | [diff] [blame] | 138 | goto tb_found; |
Flavio Leitner | 2b05ad3 | 2012-01-25 08:34:51 +0000 | [diff] [blame] | 139 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 140 | goto next; |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 141 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 142 | break; |
| 143 | next: |
| 144 | spin_unlock(&head->lock); |
Amerigo Wang | e3826f1 | 2010-05-05 00:27:06 +0000 | [diff] [blame] | 145 | next_nolock: |
Stephen Hemminger | 6df7163 | 2005-11-03 16:33:23 -0800 | [diff] [blame] | 146 | if (++rover > high) |
| 147 | rover = low; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 148 | } while (--remaining > 0); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 149 | |
| 150 | /* Exhausted local port range during search? It is not |
| 151 | * possible for us to be holding one of the bind hash |
| 152 | * locks if this test triggers, because if 'remaining' |
| 153 | * drops to zero, we broke out of the do/while loop at |
| 154 | * the top level, not from the 'break;' statement. |
| 155 | */ |
| 156 | ret = 1; |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 157 | if (remaining <= 0) { |
| 158 | if (smallest_size != -1) { |
| 159 | snum = smallest_rover; |
| 160 | goto have_snum; |
| 161 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 162 | goto fail; |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 163 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 164 | /* OK, here is the one we will use. HEAD is |
| 165 | * non-NULL and we hold it's mutex. |
| 166 | */ |
| 167 | snum = rover; |
| 168 | } else { |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 169 | have_snum: |
Pavel Emelyanov | 7f635ab | 2008-06-16 17:12:49 -0700 | [diff] [blame] | 170 | head = &hashinfo->bhash[inet_bhashfn(net, snum, |
| 171 | hashinfo->bhash_size)]; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 172 | spin_lock(&head->lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 173 | inet_bind_bucket_for_each(tb, &head->chain) |
Octavian Purdila | 09ad9bc | 2009-11-25 15:14:13 -0800 | [diff] [blame] | 174 | if (net_eq(ib_net(tb), net) && tb->port == snum) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 175 | goto tb_found; |
| 176 | } |
| 177 | tb = NULL; |
| 178 | goto tb_not_found; |
| 179 | tb_found: |
| 180 | if (!hlist_empty(&tb->owners)) { |
Pavel Emelyanov | 4a17fd5 | 2012-04-19 03:39:36 +0000 | [diff] [blame] | 181 | if (sk->sk_reuse == SK_FORCE_REUSE) |
| 182 | goto success; |
| 183 | |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 184 | if (((tb->fastreuse > 0 && |
| 185 | sk->sk_reuse && sk->sk_state != TCP_LISTEN) || |
| 186 | (tb->fastreuseport > 0 && |
| 187 | sk->sk_reuseport && uid_eq(tb->fastuid, uid))) && |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 188 | smallest_size == -1) { |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 189 | goto success; |
| 190 | } else { |
| 191 | ret = 1; |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 192 | if (inet_csk(sk)->icsk_af_ops->bind_conflict(sk, tb, true)) { |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 193 | if (((sk->sk_reuse && sk->sk_state != TCP_LISTEN) || |
Tom Herbert | 9c5e0c0 | 2013-01-26 07:50:54 +0000 | [diff] [blame] | 194 | (tb->fastreuseport > 0 && |
| 195 | sk->sk_reuseport && uid_eq(tb->fastuid, uid))) && |
Stephen Hemminger | 5add300 | 2009-02-01 01:40:17 -0800 | [diff] [blame] | 196 | smallest_size != -1 && --attempts >= 0) { |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 197 | spin_unlock(&head->lock); |
| 198 | goto again; |
| 199 | } |
Alex Copot | aacd928 | 2012-04-12 22:21:45 +0000 | [diff] [blame] | 200 | |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 201 | goto fail_unlock; |
Evgeniy Polyakov | a9d8f91 | 2009-01-19 16:46:02 -0800 | [diff] [blame] | 202 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 203 | } |
| 204 | } |
| 205 | tb_not_found: |
| 206 | ret = 1; |
Pavel Emelyanov | 941b1d2 | 2008-01-31 05:05:50 -0800 | [diff] [blame] | 207 | if (!tb && (tb = inet_bind_bucket_create(hashinfo->bind_bucket_cachep, |
| 208 | net, head, snum)) == NULL) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 209 | goto fail_unlock; |
| 210 | if (hlist_empty(&tb->owners)) { |
| 211 | if (sk->sk_reuse && sk->sk_state != TCP_LISTEN) |
| 212 | tb->fastreuse = 1; |
| 213 | else |
| 214 | tb->fastreuse = 0; |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 215 | if (sk->sk_reuseport) { |
| 216 | tb->fastreuseport = 1; |
| 217 | tb->fastuid = uid; |
Tom Herbert | 9c5e0c0 | 2013-01-26 07:50:54 +0000 | [diff] [blame] | 218 | } else |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 219 | tb->fastreuseport = 0; |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 220 | } else { |
| 221 | if (tb->fastreuse && |
| 222 | (!sk->sk_reuse || sk->sk_state == TCP_LISTEN)) |
| 223 | tb->fastreuse = 0; |
| 224 | if (tb->fastreuseport && |
Tom Herbert | 9c5e0c0 | 2013-01-26 07:50:54 +0000 | [diff] [blame] | 225 | (!sk->sk_reuseport || !uid_eq(tb->fastuid, uid))) |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 226 | tb->fastreuseport = 0; |
Tom Herbert | da5e363 | 2013-01-22 09:50:24 +0000 | [diff] [blame] | 227 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 228 | success: |
| 229 | if (!inet_csk(sk)->icsk_bind_hash) |
| 230 | inet_bind_hash(sk, tb, snum); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 231 | WARN_ON(inet_csk(sk)->icsk_bind_hash != tb); |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 232 | ret = 0; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 233 | |
| 234 | fail_unlock: |
| 235 | spin_unlock(&head->lock); |
| 236 | fail: |
| 237 | local_bh_enable(); |
| 238 | return ret; |
| 239 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 240 | EXPORT_SYMBOL_GPL(inet_csk_get_port); |
| 241 | |
| 242 | /* |
| 243 | * Wait for an incoming connection, avoid race conditions. This must be called |
| 244 | * with the socket locked. |
| 245 | */ |
| 246 | static int inet_csk_wait_for_connect(struct sock *sk, long timeo) |
| 247 | { |
| 248 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 249 | DEFINE_WAIT(wait); |
| 250 | int err; |
| 251 | |
| 252 | /* |
| 253 | * True wake-one mechanism for incoming connections: only |
| 254 | * one process gets woken up, not the 'whole herd'. |
| 255 | * Since we do not 'race & poll' for established sockets |
| 256 | * anymore, the common case will execute the loop only once. |
| 257 | * |
| 258 | * Subtle issue: "add_wait_queue_exclusive()" will be added |
| 259 | * after any current non-exclusive waiters, and we know that |
| 260 | * it will always _stay_ after any new non-exclusive waiters |
| 261 | * because all non-exclusive waiters are added at the |
| 262 | * beginning of the wait-queue. As such, it's ok to "drop" |
| 263 | * our exclusiveness temporarily when we get woken up without |
| 264 | * having to remove and re-insert us on the wait queue. |
| 265 | */ |
| 266 | for (;;) { |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 267 | prepare_to_wait_exclusive(sk_sleep(sk), &wait, |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 268 | TASK_INTERRUPTIBLE); |
| 269 | release_sock(sk); |
| 270 | if (reqsk_queue_empty(&icsk->icsk_accept_queue)) |
| 271 | timeo = schedule_timeout(timeo); |
Eric Dumazet | cb7cf8a | 2015-03-16 12:19:24 -0700 | [diff] [blame] | 272 | sched_annotate_sleep(); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 273 | lock_sock(sk); |
| 274 | err = 0; |
| 275 | if (!reqsk_queue_empty(&icsk->icsk_accept_queue)) |
| 276 | break; |
| 277 | err = -EINVAL; |
| 278 | if (sk->sk_state != TCP_LISTEN) |
| 279 | break; |
| 280 | err = sock_intr_errno(timeo); |
| 281 | if (signal_pending(current)) |
| 282 | break; |
| 283 | err = -EAGAIN; |
| 284 | if (!timeo) |
| 285 | break; |
| 286 | } |
Eric Dumazet | aa39514 | 2010-04-20 13:03:51 +0000 | [diff] [blame] | 287 | finish_wait(sk_sleep(sk), &wait); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 288 | return err; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * This will accept the next outstanding connection. |
| 293 | */ |
| 294 | struct sock *inet_csk_accept(struct sock *sk, int flags, int *err) |
| 295 | { |
| 296 | struct inet_connection_sock *icsk = inet_csk(sk); |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 297 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 298 | struct request_sock *req; |
Eric Dumazet | e3d95ad | 2015-03-17 18:32:30 -0700 | [diff] [blame] | 299 | struct sock *newsk; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 300 | int error; |
| 301 | |
| 302 | lock_sock(sk); |
| 303 | |
| 304 | /* We need to make sure that this socket is listening, |
| 305 | * and that it has something pending. |
| 306 | */ |
| 307 | error = -EINVAL; |
| 308 | if (sk->sk_state != TCP_LISTEN) |
| 309 | goto out_err; |
| 310 | |
| 311 | /* Find already established connection */ |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 312 | if (reqsk_queue_empty(queue)) { |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 313 | long timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); |
| 314 | |
| 315 | /* If this is a non blocking socket don't sleep */ |
| 316 | error = -EAGAIN; |
| 317 | if (!timeo) |
| 318 | goto out_err; |
| 319 | |
| 320 | error = inet_csk_wait_for_connect(sk, timeo); |
| 321 | if (error) |
| 322 | goto out_err; |
| 323 | } |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 324 | req = reqsk_queue_remove(queue); |
| 325 | newsk = req->sk; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 326 | |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 327 | sk_acceptq_removed(sk); |
Eric Dumazet | e3d95ad | 2015-03-17 18:32:30 -0700 | [diff] [blame] | 328 | if (sk->sk_protocol == IPPROTO_TCP && |
| 329 | tcp_rsk(req)->tfo_listener && |
| 330 | queue->fastopenq) { |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 331 | spin_lock_bh(&queue->fastopenq->lock); |
Eric Dumazet | 9439ce0 | 2015-03-17 18:32:29 -0700 | [diff] [blame] | 332 | if (tcp_rsk(req)->tfo_listener) { |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 333 | /* We are still waiting for the final ACK from 3WHS |
| 334 | * so can't free req now. Instead, we set req->sk to |
| 335 | * NULL to signify that the child socket is taken |
| 336 | * so reqsk_fastopen_remove() will free the req |
| 337 | * when 3WHS finishes (or is aborted). |
| 338 | */ |
| 339 | req->sk = NULL; |
| 340 | req = NULL; |
| 341 | } |
| 342 | spin_unlock_bh(&queue->fastopenq->lock); |
| 343 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 344 | out: |
| 345 | release_sock(sk); |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 346 | if (req) |
Eric Dumazet | 13854e5 | 2015-03-15 21:12:16 -0700 | [diff] [blame] | 347 | reqsk_put(req); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 348 | return newsk; |
| 349 | out_err: |
| 350 | newsk = NULL; |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 351 | req = NULL; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 352 | *err = error; |
| 353 | goto out; |
| 354 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 355 | EXPORT_SYMBOL(inet_csk_accept); |
| 356 | |
| 357 | /* |
| 358 | * Using different timers for retransmit, delayed acks and probes |
YOSHIFUJI Hideaki | e905a9e | 2007-02-09 23:24:47 +0900 | [diff] [blame] | 359 | * We may wish use just one timer maintaining a list of expire jiffies |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 360 | * to optimize. |
| 361 | */ |
| 362 | void inet_csk_init_xmit_timers(struct sock *sk, |
| 363 | void (*retransmit_handler)(unsigned long), |
| 364 | void (*delack_handler)(unsigned long), |
| 365 | void (*keepalive_handler)(unsigned long)) |
| 366 | { |
| 367 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 368 | |
Pavel Emelyanov | b24b8a2 | 2008-01-23 21:20:07 -0800 | [diff] [blame] | 369 | setup_timer(&icsk->icsk_retransmit_timer, retransmit_handler, |
| 370 | (unsigned long)sk); |
| 371 | setup_timer(&icsk->icsk_delack_timer, delack_handler, |
| 372 | (unsigned long)sk); |
| 373 | setup_timer(&sk->sk_timer, keepalive_handler, (unsigned long)sk); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 374 | icsk->icsk_pending = icsk->icsk_ack.pending = 0; |
| 375 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 376 | EXPORT_SYMBOL(inet_csk_init_xmit_timers); |
| 377 | |
| 378 | void inet_csk_clear_xmit_timers(struct sock *sk) |
| 379 | { |
| 380 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 381 | |
| 382 | icsk->icsk_pending = icsk->icsk_ack.pending = icsk->icsk_ack.blocked = 0; |
| 383 | |
| 384 | sk_stop_timer(sk, &icsk->icsk_retransmit_timer); |
| 385 | sk_stop_timer(sk, &icsk->icsk_delack_timer); |
| 386 | sk_stop_timer(sk, &sk->sk_timer); |
| 387 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 388 | EXPORT_SYMBOL(inet_csk_clear_xmit_timers); |
| 389 | |
| 390 | void inet_csk_delete_keepalive_timer(struct sock *sk) |
| 391 | { |
| 392 | sk_stop_timer(sk, &sk->sk_timer); |
| 393 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 394 | EXPORT_SYMBOL(inet_csk_delete_keepalive_timer); |
| 395 | |
| 396 | void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long len) |
| 397 | { |
| 398 | sk_reset_timer(sk, &sk->sk_timer, jiffies + len); |
| 399 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 400 | EXPORT_SYMBOL(inet_csk_reset_keepalive_timer); |
| 401 | |
Jianjun Kong | d9319100 | 2008-11-03 00:23:42 -0800 | [diff] [blame] | 402 | struct dst_entry *inet_csk_route_req(struct sock *sk, |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 403 | struct flowi4 *fl4, |
David S. Miller | ba3f7f0 | 2012-07-17 14:02:46 -0700 | [diff] [blame] | 404 | const struct request_sock *req) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 405 | { |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 406 | const struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | 8b929ab | 2015-03-22 10:22:20 -0700 | [diff] [blame] | 407 | struct net *net = read_pnet(&ireq->ireq_net); |
| 408 | struct ip_options_rcu *opt = ireq->opt; |
| 409 | struct rtable *rt; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 410 | |
Eric Dumazet | 8b929ab | 2015-03-22 10:22:20 -0700 | [diff] [blame] | 411 | flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, |
David S. Miller | e79d9bc | 2011-03-31 04:53:20 -0700 | [diff] [blame] | 412 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
Eric Dumazet | 8b929ab | 2015-03-22 10:22:20 -0700 | [diff] [blame] | 413 | sk->sk_protocol, inet_sk_flowi_flags(sk), |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 414 | (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr, |
Eric Dumazet | 8b929ab | 2015-03-22 10:22:20 -0700 | [diff] [blame] | 415 | ireq->ir_loc_addr, ireq->ir_rmt_port, |
| 416 | htons(ireq->ir_num)); |
David S. Miller | 6bd023f | 2011-05-18 18:32:03 -0400 | [diff] [blame] | 417 | security_req_classify_flow(req, flowi4_to_flowi(fl4)); |
| 418 | rt = ip_route_output_flow(net, fl4, sk); |
David S. Miller | b23dd4f | 2011-03-02 14:31:35 -0800 | [diff] [blame] | 419 | if (IS_ERR(rt)) |
Ilpo Järvinen | 857a6e0 | 2008-12-14 23:13:08 -0800 | [diff] [blame] | 420 | goto no_route; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 421 | if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway) |
Ilpo Järvinen | 857a6e0 | 2008-12-14 23:13:08 -0800 | [diff] [blame] | 422 | goto route_err; |
Changli Gao | d8d1f30 | 2010-06-10 23:31:35 -0700 | [diff] [blame] | 423 | return &rt->dst; |
Ilpo Järvinen | 857a6e0 | 2008-12-14 23:13:08 -0800 | [diff] [blame] | 424 | |
| 425 | route_err: |
| 426 | ip_rt_put(rt); |
| 427 | no_route: |
| 428 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
| 429 | return NULL; |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 430 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 431 | EXPORT_SYMBOL_GPL(inet_csk_route_req); |
| 432 | |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 433 | struct dst_entry *inet_csk_route_child_sock(struct sock *sk, |
| 434 | struct sock *newsk, |
| 435 | const struct request_sock *req) |
| 436 | { |
| 437 | const struct inet_request_sock *ireq = inet_rsk(req); |
Eric Dumazet | 8b929ab | 2015-03-22 10:22:20 -0700 | [diff] [blame] | 438 | struct net *net = read_pnet(&ireq->ireq_net); |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 439 | struct inet_sock *newinet = inet_sk(newsk); |
Christoph Paasch | 1a7b27c | 2012-08-20 02:52:09 +0000 | [diff] [blame] | 440 | struct ip_options_rcu *opt; |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 441 | struct flowi4 *fl4; |
| 442 | struct rtable *rt; |
| 443 | |
| 444 | fl4 = &newinet->cork.fl.u.ip4; |
Christoph Paasch | 1a7b27c | 2012-08-20 02:52:09 +0000 | [diff] [blame] | 445 | |
| 446 | rcu_read_lock(); |
| 447 | opt = rcu_dereference(newinet->inet_opt); |
Eric Dumazet | 8b929ab | 2015-03-22 10:22:20 -0700 | [diff] [blame] | 448 | flowi4_init_output(fl4, ireq->ir_iif, ireq->ir_mark, |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 449 | RT_CONN_FLAGS(sk), RT_SCOPE_UNIVERSE, |
| 450 | sk->sk_protocol, inet_sk_flowi_flags(sk), |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 451 | (opt && opt->opt.srr) ? opt->opt.faddr : ireq->ir_rmt_addr, |
Eric Dumazet | 8b929ab | 2015-03-22 10:22:20 -0700 | [diff] [blame] | 452 | ireq->ir_loc_addr, ireq->ir_rmt_port, |
| 453 | htons(ireq->ir_num)); |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 454 | security_req_classify_flow(req, flowi4_to_flowi(fl4)); |
| 455 | rt = ip_route_output_flow(net, fl4, sk); |
| 456 | if (IS_ERR(rt)) |
| 457 | goto no_route; |
Julian Anastasov | 155e833 | 2012-10-08 11:41:18 +0000 | [diff] [blame] | 458 | if (opt && opt->opt.is_strictroute && rt->rt_uses_gateway) |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 459 | goto route_err; |
Christoph Paasch | 1a7b27c | 2012-08-20 02:52:09 +0000 | [diff] [blame] | 460 | rcu_read_unlock(); |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 461 | return &rt->dst; |
| 462 | |
| 463 | route_err: |
| 464 | ip_rt_put(rt); |
| 465 | no_route: |
Christoph Paasch | 1a7b27c | 2012-08-20 02:52:09 +0000 | [diff] [blame] | 466 | rcu_read_unlock(); |
David S. Miller | 77357a9 | 2011-05-08 14:34:22 -0700 | [diff] [blame] | 467 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
| 468 | return NULL; |
| 469 | } |
| 470 | EXPORT_SYMBOL_GPL(inet_csk_route_child_sock); |
| 471 | |
Al Viro | 6b72977 | 2006-09-27 18:36:59 -0700 | [diff] [blame] | 472 | static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport, |
Eric Dumazet | 72a3eff | 2006-11-16 02:30:37 -0800 | [diff] [blame] | 473 | const u32 rnd, const u32 synq_hsize) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 474 | { |
Al Viro | 6b72977 | 2006-09-27 18:36:59 -0700 | [diff] [blame] | 475 | return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 476 | } |
| 477 | |
Eric Dumazet | dfd56b8 | 2011-12-10 09:48:31 +0000 | [diff] [blame] | 478 | #if IS_ENABLED(CONFIG_IPV6) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 479 | #define AF_INET_FAMILY(fam) ((fam) == AF_INET) |
| 480 | #else |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 481 | #define AF_INET_FAMILY(fam) true |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 482 | #endif |
| 483 | |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 484 | /* Note: this is temporary : |
| 485 | * req sock will no longer be in listener hash table |
| 486 | */ |
| 487 | struct request_sock *inet_csk_search_req(struct sock *sk, |
| 488 | const __be16 rport, |
| 489 | const __be32 raddr, |
Al Viro | 7f25afb | 2006-09-27 18:27:47 -0700 | [diff] [blame] | 490 | const __be32 laddr) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 491 | { |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 492 | struct inet_connection_sock *icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 493 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
Eric Dumazet | 52452c5 | 2015-03-19 19:04:19 -0700 | [diff] [blame] | 494 | struct request_sock *req; |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 495 | u32 hash = inet_synq_hash(raddr, rport, lopt->hash_rnd, |
| 496 | lopt->nr_table_entries); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 497 | |
Eric Dumazet | b282705 | 2015-03-22 10:22:21 -0700 | [diff] [blame] | 498 | spin_lock(&icsk->icsk_accept_queue.syn_wait_lock); |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 499 | for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) { |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 500 | const struct inet_request_sock *ireq = inet_rsk(req); |
| 501 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 502 | if (ireq->ir_rmt_port == rport && |
| 503 | ireq->ir_rmt_addr == raddr && |
| 504 | ireq->ir_loc_addr == laddr && |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 505 | AF_INET_FAMILY(req->rsk_ops->family)) { |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 506 | atomic_inc(&req->rsk_refcnt); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 507 | WARN_ON(req->sk); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 508 | break; |
| 509 | } |
| 510 | } |
Eric Dumazet | b282705 | 2015-03-22 10:22:21 -0700 | [diff] [blame] | 511 | spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 512 | |
| 513 | return req; |
| 514 | } |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 515 | EXPORT_SYMBOL_GPL(inet_csk_search_req); |
| 516 | |
| 517 | void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req, |
Arnaldo Carvalho de Melo | c2977c2 | 2005-12-13 23:15:12 -0800 | [diff] [blame] | 518 | unsigned long timeout) |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 519 | { |
| 520 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 521 | struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 522 | const u32 h = inet_synq_hash(inet_rsk(req)->ir_rmt_addr, |
| 523 | inet_rsk(req)->ir_rmt_port, |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 524 | lopt->hash_rnd, lopt->nr_table_entries); |
| 525 | |
| 526 | reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); |
| 527 | inet_csk_reqsk_queue_added(sk, timeout); |
| 528 | } |
Eric Dumazet | 4bc2f18 | 2010-07-09 21:22:10 +0000 | [diff] [blame] | 529 | EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add); |
Arnaldo Carvalho de Melo | 3f421ba | 2005-08-09 20:11:08 -0700 | [diff] [blame] | 530 | |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 531 | /* Only thing we need from tcp.h */ |
| 532 | extern int sysctl_tcp_synack_retries; |
| 533 | |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 534 | |
Julian Anastasov | 0c3d79b | 2009-10-19 10:03:58 +0000 | [diff] [blame] | 535 | /* Decide when to expire the request and when to resend SYN-ACK */ |
| 536 | static inline void syn_ack_recalc(struct request_sock *req, const int thresh, |
| 537 | const int max_retries, |
| 538 | const u8 rskq_defer_accept, |
| 539 | int *expire, int *resend) |
| 540 | { |
| 541 | if (!rskq_defer_accept) { |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 542 | *expire = req->num_timeout >= thresh; |
Julian Anastasov | 0c3d79b | 2009-10-19 10:03:58 +0000 | [diff] [blame] | 543 | *resend = 1; |
| 544 | return; |
| 545 | } |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 546 | *expire = req->num_timeout >= thresh && |
| 547 | (!inet_rsk(req)->acked || req->num_timeout >= max_retries); |
Julian Anastasov | 0c3d79b | 2009-10-19 10:03:58 +0000 | [diff] [blame] | 548 | /* |
| 549 | * Do not resend while waiting for data after ACK, |
| 550 | * start to resend on end of deferring period to give |
| 551 | * last chance for data or ACK to create established socket. |
| 552 | */ |
| 553 | *resend = !inet_rsk(req)->acked || |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 554 | req->num_timeout >= rskq_defer_accept - 1; |
Julian Anastasov | 0c3d79b | 2009-10-19 10:03:58 +0000 | [diff] [blame] | 555 | } |
| 556 | |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 557 | int inet_rtx_syn_ack(struct sock *parent, struct request_sock *req) |
| 558 | { |
Christoph Paasch | 1a2c618 | 2013-03-17 08:23:34 +0000 | [diff] [blame] | 559 | int err = req->rsk_ops->rtx_syn_ack(parent, req); |
Eric Dumazet | e6c022a | 2012-10-27 23:16:46 +0000 | [diff] [blame] | 560 | |
| 561 | if (!err) |
| 562 | req->num_retrans++; |
| 563 | return err; |
| 564 | } |
| 565 | EXPORT_SYMBOL(inet_rtx_syn_ack); |
| 566 | |
Eric Dumazet | b357a36 | 2015-04-23 18:03:44 -0700 | [diff] [blame] | 567 | /* return true if req was found in the syn_table[] */ |
| 568 | static bool reqsk_queue_unlink(struct request_sock_queue *queue, |
| 569 | struct request_sock *req) |
| 570 | { |
| 571 | struct listen_sock *lopt = queue->listen_opt; |
| 572 | struct request_sock **prev; |
| 573 | bool found = false; |
| 574 | |
| 575 | spin_lock(&queue->syn_wait_lock); |
| 576 | |
| 577 | for (prev = &lopt->syn_table[req->rsk_hash]; *prev != NULL; |
| 578 | prev = &(*prev)->dl_next) { |
| 579 | if (*prev == req) { |
| 580 | *prev = req->dl_next; |
| 581 | found = true; |
| 582 | break; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | spin_unlock(&queue->syn_wait_lock); |
| 587 | if (del_timer(&req->rsk_timer)) |
| 588 | reqsk_put(req); |
| 589 | return found; |
| 590 | } |
| 591 | |
| 592 | void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req) |
| 593 | { |
| 594 | if (reqsk_queue_unlink(&inet_csk(sk)->icsk_accept_queue, req)) { |
| 595 | reqsk_queue_removed(&inet_csk(sk)->icsk_accept_queue, req); |
| 596 | reqsk_put(req); |
| 597 | } |
| 598 | } |
| 599 | EXPORT_SYMBOL(inet_csk_reqsk_queue_drop); |
| 600 | |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 601 | static void reqsk_timer_handler(unsigned long data) |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 602 | { |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 603 | struct request_sock *req = (struct request_sock *)data; |
| 604 | struct sock *sk_listener = req->rsk_listener; |
| 605 | struct inet_connection_sock *icsk = inet_csk(sk_listener); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 606 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
| 607 | struct listen_sock *lopt = queue->listen_opt; |
Eric Dumazet | 2b41fab | 2015-03-22 10:22:18 -0700 | [diff] [blame] | 608 | int qlen, expire = 0, resend = 0; |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 609 | int max_retries, thresh; |
Eric Dumazet | 2b41fab | 2015-03-22 10:22:18 -0700 | [diff] [blame] | 610 | u8 defer_accept; |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 611 | |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 612 | if (sk_listener->sk_state != TCP_LISTEN || !lopt) { |
| 613 | reqsk_put(req); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 614 | return; |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 615 | } |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 616 | |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 617 | max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries; |
| 618 | thresh = max_retries; |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 619 | /* Normally all the openreqs are young and become mature |
| 620 | * (i.e. converted to established socket) for first timeout. |
Eric Dumazet | fd4f2ce | 2012-04-12 19:48:40 +0000 | [diff] [blame] | 621 | * If synack was not acknowledged for 1 second, it means |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 622 | * one of the following things: synack was lost, ack was lost, |
| 623 | * rtt is high or nobody planned to ack (i.e. synflood). |
| 624 | * When server is a bit loaded, queue is populated with old |
| 625 | * open requests, reducing effective size of queue. |
| 626 | * When server is well loaded, queue size reduces to zero |
| 627 | * after several minutes of work. It is not synflood, |
| 628 | * it is normal operation. The solution is pruning |
| 629 | * too old entries overriding normal timeout, when |
| 630 | * situation becomes dangerous. |
| 631 | * |
| 632 | * Essentially, we reserve half of room for young |
| 633 | * embrions; and abort old ones without pity, if old |
| 634 | * ones are about to clog our table. |
| 635 | */ |
Eric Dumazet | 2b41fab | 2015-03-22 10:22:18 -0700 | [diff] [blame] | 636 | qlen = listen_sock_qlen(lopt); |
| 637 | if (qlen >> (lopt->max_qlen_log - 1)) { |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 638 | int young = listen_sock_young(lopt) << 1; |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 639 | |
| 640 | while (thresh > 2) { |
Eric Dumazet | 2b41fab | 2015-03-22 10:22:18 -0700 | [diff] [blame] | 641 | if (qlen < young) |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 642 | break; |
| 643 | thresh--; |
| 644 | young <<= 1; |
| 645 | } |
| 646 | } |
Eric Dumazet | 2b41fab | 2015-03-22 10:22:18 -0700 | [diff] [blame] | 647 | defer_accept = READ_ONCE(queue->rskq_defer_accept); |
| 648 | if (defer_accept) |
| 649 | max_retries = defer_accept; |
| 650 | syn_ack_recalc(req, thresh, max_retries, defer_accept, |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 651 | &expire, &resend); |
Eric Dumazet | 42cb80a | 2015-03-22 10:22:19 -0700 | [diff] [blame] | 652 | req->rsk_ops->syn_ack_timeout(req); |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 653 | if (!expire && |
| 654 | (!resend || |
| 655 | !inet_rtx_syn_ack(sk_listener, req) || |
| 656 | inet_rsk(req)->acked)) { |
| 657 | unsigned long timeo; |
David S. Miller | ec0a196 | 2008-06-12 16:31:35 -0700 | [diff] [blame] | 658 | |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 659 | if (req->num_timeout++ == 0) |
| 660 | atomic_inc(&lopt->young_dec); |
| 661 | timeo = min(TCP_TIMEOUT_INIT << req->num_timeout, TCP_RTO_MAX); |
| 662 | mod_timer_pinned(&req->rsk_timer, jiffies + timeo); |
| 663 | return; |
| 664 | } |
| 665 | inet_csk_reqsk_queue_drop(sk_listener, req); |
| 666 | reqsk_put(req); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 667 | } |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 668 | |
| 669 | void reqsk_queue_hash_req(struct request_sock_queue *queue, |
| 670 | u32 hash, struct request_sock *req, |
| 671 | unsigned long timeout) |
| 672 | { |
| 673 | struct listen_sock *lopt = queue->listen_opt; |
| 674 | |
| 675 | req->num_retrans = 0; |
| 676 | req->num_timeout = 0; |
| 677 | req->sk = NULL; |
| 678 | |
| 679 | /* before letting lookups find us, make sure all req fields |
| 680 | * are committed to memory and refcnt initialized. |
| 681 | */ |
| 682 | smp_wmb(); |
| 683 | atomic_set(&req->rsk_refcnt, 2); |
| 684 | setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req); |
| 685 | req->rsk_hash = hash; |
| 686 | |
Eric Dumazet | b282705 | 2015-03-22 10:22:21 -0700 | [diff] [blame] | 687 | spin_lock(&queue->syn_wait_lock); |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 688 | req->dl_next = lopt->syn_table[hash]; |
| 689 | lopt->syn_table[hash] = req; |
Eric Dumazet | b282705 | 2015-03-22 10:22:21 -0700 | [diff] [blame] | 690 | spin_unlock(&queue->syn_wait_lock); |
Eric Dumazet | fa76ce73 | 2015-03-19 19:04:20 -0700 | [diff] [blame] | 691 | |
| 692 | mod_timer_pinned(&req->rsk_timer, jiffies + timeout); |
| 693 | } |
| 694 | EXPORT_SYMBOL(reqsk_queue_hash_req); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 695 | |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 696 | /** |
| 697 | * inet_csk_clone_lock - clone an inet socket, and lock its clone |
| 698 | * @sk: the socket to clone |
| 699 | * @req: request_sock |
| 700 | * @priority: for allocation (%GFP_KERNEL, %GFP_ATOMIC, etc) |
| 701 | * |
| 702 | * Caller must unlock socket even in error path (bh_unlock_sock(newsk)) |
| 703 | */ |
| 704 | struct sock *inet_csk_clone_lock(const struct sock *sk, |
| 705 | const struct request_sock *req, |
| 706 | const gfp_t priority) |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 707 | { |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 708 | struct sock *newsk = sk_clone_lock(sk, priority); |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 709 | |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 710 | if (newsk) { |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 711 | struct inet_connection_sock *newicsk = inet_csk(newsk); |
| 712 | |
| 713 | newsk->sk_state = TCP_SYN_RECV; |
| 714 | newicsk->icsk_bind_hash = NULL; |
| 715 | |
Eric Dumazet | 634fb979 | 2013-10-09 15:21:29 -0700 | [diff] [blame] | 716 | inet_sk(newsk)->inet_dport = inet_rsk(req)->ir_rmt_port; |
Eric Dumazet | b44084c | 2013-10-10 00:04:37 -0700 | [diff] [blame] | 717 | inet_sk(newsk)->inet_num = inet_rsk(req)->ir_num; |
| 718 | inet_sk(newsk)->inet_sport = htons(inet_rsk(req)->ir_num); |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 719 | newsk->sk_write_space = sk_stream_write_space; |
| 720 | |
Lorenzo Colitti | 84f39b0 | 2014-05-13 10:17:35 -0700 | [diff] [blame] | 721 | newsk->sk_mark = inet_rsk(req)->ir_mark; |
Eric Dumazet | 33cf7c9 | 2015-03-11 18:53:14 -0700 | [diff] [blame] | 722 | atomic64_set(&newsk->sk_cookie, |
| 723 | atomic64_read(&inet_rsk(req)->ir_cookie)); |
Lorenzo Colitti | 84f39b0 | 2014-05-13 10:17:35 -0700 | [diff] [blame] | 724 | |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 725 | newicsk->icsk_retransmits = 0; |
Arnaldo Carvalho de Melo | 6687e98 | 2005-08-10 04:03:31 -0300 | [diff] [blame] | 726 | newicsk->icsk_backoff = 0; |
| 727 | newicsk->icsk_probes_out = 0; |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 728 | |
| 729 | /* Deinitialize accept_queue to trap illegal accesses. */ |
| 730 | memset(&newicsk->icsk_accept_queue, 0, sizeof(newicsk->icsk_accept_queue)); |
Venkat Yekkirala | 4237c75 | 2006-07-24 23:32:50 -0700 | [diff] [blame] | 731 | |
| 732 | security_inet_csk_clone(newsk, req); |
Arnaldo Carvalho de Melo | 9f1d260 | 2005-08-09 20:11:24 -0700 | [diff] [blame] | 733 | } |
| 734 | return newsk; |
| 735 | } |
Eric Dumazet | e56c57d | 2011-11-08 17:07:07 -0500 | [diff] [blame] | 736 | EXPORT_SYMBOL_GPL(inet_csk_clone_lock); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 737 | |
| 738 | /* |
| 739 | * At this point, there should be no process reference to this |
| 740 | * socket, and thus no user references at all. Therefore we |
| 741 | * can assume the socket waitqueue is inactive and nobody will |
| 742 | * try to jump onto it. |
| 743 | */ |
| 744 | void inet_csk_destroy_sock(struct sock *sk) |
| 745 | { |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 746 | WARN_ON(sk->sk_state != TCP_CLOSE); |
| 747 | WARN_ON(!sock_flag(sk, SOCK_DEAD)); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 748 | |
| 749 | /* It cannot be in hash table! */ |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 750 | WARN_ON(!sk_unhashed(sk)); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 751 | |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 752 | /* If it has not 0 inet_sk(sk)->inet_num, it must be bound */ |
| 753 | WARN_ON(inet_sk(sk)->inet_num && !inet_csk(sk)->icsk_bind_hash); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 754 | |
| 755 | sk->sk_prot->destroy(sk); |
| 756 | |
| 757 | sk_stream_kill_queues(sk); |
| 758 | |
| 759 | xfrm_sk_free_policy(sk); |
| 760 | |
| 761 | sk_refcnt_debug_release(sk); |
| 762 | |
Eric Dumazet | dd24c00 | 2008-11-25 21:17:14 -0800 | [diff] [blame] | 763 | percpu_counter_dec(sk->sk_prot->orphan_count); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 764 | sock_put(sk); |
| 765 | } |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 766 | EXPORT_SYMBOL(inet_csk_destroy_sock); |
| 767 | |
Christoph Paasch | e337e24 | 2012-12-14 04:07:58 +0000 | [diff] [blame] | 768 | /* This function allows to force a closure of a socket after the call to |
| 769 | * tcp/dccp_create_openreq_child(). |
| 770 | */ |
| 771 | void inet_csk_prepare_forced_close(struct sock *sk) |
Christoph Paasch | c10cb5f | 2013-03-07 02:34:33 +0000 | [diff] [blame] | 772 | __releases(&sk->sk_lock.slock) |
Christoph Paasch | e337e24 | 2012-12-14 04:07:58 +0000 | [diff] [blame] | 773 | { |
| 774 | /* sk_clone_lock locked the socket and set refcnt to 2 */ |
| 775 | bh_unlock_sock(sk); |
| 776 | sock_put(sk); |
| 777 | |
| 778 | /* The below has to be done to allow calling inet_csk_destroy_sock */ |
| 779 | sock_set_flag(sk, SOCK_DEAD); |
| 780 | percpu_counter_inc(sk->sk_prot->orphan_count); |
| 781 | inet_sk(sk)->inet_num = 0; |
| 782 | } |
| 783 | EXPORT_SYMBOL(inet_csk_prepare_forced_close); |
| 784 | |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 785 | int inet_csk_listen_start(struct sock *sk, const int nr_table_entries) |
| 786 | { |
| 787 | struct inet_sock *inet = inet_sk(sk); |
| 788 | struct inet_connection_sock *icsk = inet_csk(sk); |
| 789 | int rc = reqsk_queue_alloc(&icsk->icsk_accept_queue, nr_table_entries); |
| 790 | |
| 791 | if (rc != 0) |
| 792 | return rc; |
| 793 | |
| 794 | sk->sk_max_ack_backlog = 0; |
| 795 | sk->sk_ack_backlog = 0; |
| 796 | inet_csk_delack_init(sk); |
| 797 | |
| 798 | /* There is race window here: we announce ourselves listening, |
| 799 | * but this transition is still not validated by get_port(). |
| 800 | * It is OK, because this socket enters to hash table only |
| 801 | * after validation is complete. |
| 802 | */ |
| 803 | sk->sk_state = TCP_LISTEN; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 804 | if (!sk->sk_prot->get_port(sk, inet->inet_num)) { |
| 805 | inet->inet_sport = htons(inet->inet_num); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 806 | |
| 807 | sk_dst_reset(sk); |
| 808 | sk->sk_prot->hash(sk); |
| 809 | |
| 810 | return 0; |
| 811 | } |
| 812 | |
| 813 | sk->sk_state = TCP_CLOSE; |
| 814 | __reqsk_queue_destroy(&icsk->icsk_accept_queue); |
| 815 | return -EADDRINUSE; |
| 816 | } |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 817 | EXPORT_SYMBOL_GPL(inet_csk_listen_start); |
| 818 | |
| 819 | /* |
| 820 | * This routine closes sockets which have been at least partially |
| 821 | * opened, but not yet accepted. |
| 822 | */ |
| 823 | void inet_csk_listen_stop(struct sock *sk) |
| 824 | { |
| 825 | struct inet_connection_sock *icsk = inet_csk(sk); |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 826 | struct request_sock_queue *queue = &icsk->icsk_accept_queue; |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 827 | struct request_sock *acc_req; |
| 828 | struct request_sock *req; |
| 829 | |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 830 | /* make all the listen_opt local to us */ |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 831 | acc_req = reqsk_queue_yank_acceptq(queue); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 832 | |
| 833 | /* Following specs, it would be better either to send FIN |
| 834 | * (and enter FIN-WAIT-1, it is normal close) |
| 835 | * or to send active reset (abort). |
| 836 | * Certainly, it is pretty dangerous while synflood, but it is |
| 837 | * bad justification for our negligence 8) |
| 838 | * To be honest, we are not able to make either |
| 839 | * of the variants now. --ANK |
| 840 | */ |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 841 | reqsk_queue_destroy(queue); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 842 | |
| 843 | while ((req = acc_req) != NULL) { |
| 844 | struct sock *child = req->sk; |
| 845 | |
| 846 | acc_req = req->dl_next; |
| 847 | |
| 848 | local_bh_disable(); |
| 849 | bh_lock_sock(child); |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 850 | WARN_ON(sock_owned_by_user(child)); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 851 | sock_hold(child); |
| 852 | |
| 853 | sk->sk_prot->disconnect(child, O_NONBLOCK); |
| 854 | |
| 855 | sock_orphan(child); |
| 856 | |
Herbert Xu | eb4dea5 | 2008-12-29 23:04:08 -0800 | [diff] [blame] | 857 | percpu_counter_inc(sk->sk_prot->orphan_count); |
| 858 | |
Eric Dumazet | 9439ce0 | 2015-03-17 18:32:29 -0700 | [diff] [blame] | 859 | if (sk->sk_protocol == IPPROTO_TCP && tcp_rsk(req)->tfo_listener) { |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 860 | BUG_ON(tcp_sk(child)->fastopen_rsk != req); |
Eric Dumazet | 9439ce0 | 2015-03-17 18:32:29 -0700 | [diff] [blame] | 861 | BUG_ON(sk != req->rsk_listener); |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 862 | |
| 863 | /* Paranoid, to prevent race condition if |
| 864 | * an inbound pkt destined for child is |
| 865 | * blocked by sock lock in tcp_v4_rcv(). |
| 866 | * Also to satisfy an assertion in |
| 867 | * tcp_v4_destroy_sock(). |
| 868 | */ |
| 869 | tcp_sk(child)->fastopen_rsk = NULL; |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 870 | } |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 871 | inet_csk_destroy_sock(child); |
| 872 | |
| 873 | bh_unlock_sock(child); |
| 874 | local_bh_enable(); |
| 875 | sock_put(child); |
| 876 | |
| 877 | sk_acceptq_removed(sk); |
Eric Dumazet | 13854e5 | 2015-03-15 21:12:16 -0700 | [diff] [blame] | 878 | reqsk_put(req); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 879 | } |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 880 | if (queue->fastopenq) { |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 881 | /* Free all the reqs queued in rskq_rst_head. */ |
| 882 | spin_lock_bh(&queue->fastopenq->lock); |
| 883 | acc_req = queue->fastopenq->rskq_rst_head; |
| 884 | queue->fastopenq->rskq_rst_head = NULL; |
| 885 | spin_unlock_bh(&queue->fastopenq->lock); |
| 886 | while ((req = acc_req) != NULL) { |
| 887 | acc_req = req->dl_next; |
Eric Dumazet | 13854e5 | 2015-03-15 21:12:16 -0700 | [diff] [blame] | 888 | reqsk_put(req); |
Jerry Chu | 8336886 | 2012-08-31 12:29:12 +0000 | [diff] [blame] | 889 | } |
| 890 | } |
Ilpo Järvinen | 547b792 | 2008-07-25 21:43:18 -0700 | [diff] [blame] | 891 | WARN_ON(sk->sk_ack_backlog); |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 892 | } |
Arnaldo Carvalho de Melo | a019d6f | 2005-08-09 20:15:09 -0700 | [diff] [blame] | 893 | EXPORT_SYMBOL_GPL(inet_csk_listen_stop); |
Arnaldo Carvalho de Melo | af05dc9 | 2005-12-13 23:16:04 -0800 | [diff] [blame] | 894 | |
| 895 | void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) |
| 896 | { |
| 897 | struct sockaddr_in *sin = (struct sockaddr_in *)uaddr; |
| 898 | const struct inet_sock *inet = inet_sk(sk); |
| 899 | |
| 900 | sin->sin_family = AF_INET; |
Eric Dumazet | c720c7e | 2009-10-15 06:30:45 +0000 | [diff] [blame] | 901 | sin->sin_addr.s_addr = inet->inet_daddr; |
| 902 | sin->sin_port = inet->inet_dport; |
Arnaldo Carvalho de Melo | af05dc9 | 2005-12-13 23:16:04 -0800 | [diff] [blame] | 903 | } |
Arnaldo Carvalho de Melo | af05dc9 | 2005-12-13 23:16:04 -0800 | [diff] [blame] | 904 | EXPORT_SYMBOL_GPL(inet_csk_addr2sockaddr); |
Arnaldo Carvalho de Melo | c4d9390 | 2006-03-20 22:01:03 -0800 | [diff] [blame] | 905 | |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 906 | #ifdef CONFIG_COMPAT |
| 907 | int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname, |
| 908 | char __user *optval, int __user *optlen) |
| 909 | { |
David S. Miller | dbeff12 | 2006-03-20 22:52:32 -0800 | [diff] [blame] | 910 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 911 | |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 912 | if (icsk->icsk_af_ops->compat_getsockopt) |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 913 | return icsk->icsk_af_ops->compat_getsockopt(sk, level, optname, |
| 914 | optval, optlen); |
| 915 | return icsk->icsk_af_ops->getsockopt(sk, level, optname, |
| 916 | optval, optlen); |
| 917 | } |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 918 | EXPORT_SYMBOL_GPL(inet_csk_compat_getsockopt); |
| 919 | |
| 920 | int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 921 | char __user *optval, unsigned int optlen) |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 922 | { |
David S. Miller | dbeff12 | 2006-03-20 22:52:32 -0800 | [diff] [blame] | 923 | const struct inet_connection_sock *icsk = inet_csk(sk); |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 924 | |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 925 | if (icsk->icsk_af_ops->compat_setsockopt) |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 926 | return icsk->icsk_af_ops->compat_setsockopt(sk, level, optname, |
| 927 | optval, optlen); |
| 928 | return icsk->icsk_af_ops->setsockopt(sk, level, optname, |
| 929 | optval, optlen); |
| 930 | } |
Arnaldo Carvalho de Melo | dec73ff | 2006-03-20 22:46:16 -0800 | [diff] [blame] | 931 | EXPORT_SYMBOL_GPL(inet_csk_compat_setsockopt); |
| 932 | #endif |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 933 | |
| 934 | static struct dst_entry *inet_csk_rebuild_route(struct sock *sk, struct flowi *fl) |
| 935 | { |
Eric Dumazet | 5abf7f7 | 2012-07-17 22:42:13 +0200 | [diff] [blame] | 936 | const struct inet_sock *inet = inet_sk(sk); |
| 937 | const struct ip_options_rcu *inet_opt; |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 938 | __be32 daddr = inet->inet_daddr; |
| 939 | struct flowi4 *fl4; |
| 940 | struct rtable *rt; |
| 941 | |
| 942 | rcu_read_lock(); |
| 943 | inet_opt = rcu_dereference(inet->inet_opt); |
| 944 | if (inet_opt && inet_opt->opt.srr) |
| 945 | daddr = inet_opt->opt.faddr; |
| 946 | fl4 = &fl->u.ip4; |
| 947 | rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, |
| 948 | inet->inet_saddr, inet->inet_dport, |
| 949 | inet->inet_sport, sk->sk_protocol, |
| 950 | RT_CONN_FLAGS(sk), sk->sk_bound_dev_if); |
| 951 | if (IS_ERR(rt)) |
| 952 | rt = NULL; |
| 953 | if (rt) |
| 954 | sk_setup_caps(sk, &rt->dst); |
| 955 | rcu_read_unlock(); |
| 956 | |
| 957 | return &rt->dst; |
| 958 | } |
| 959 | |
| 960 | struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu) |
| 961 | { |
| 962 | struct dst_entry *dst = __sk_dst_check(sk, 0); |
| 963 | struct inet_sock *inet = inet_sk(sk); |
| 964 | |
| 965 | if (!dst) { |
| 966 | dst = inet_csk_rebuild_route(sk, &inet->cork.fl); |
| 967 | if (!dst) |
| 968 | goto out; |
| 969 | } |
David S. Miller | 6700c27 | 2012-07-17 03:29:28 -0700 | [diff] [blame] | 970 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
David S. Miller | 80d0a69 | 2012-07-16 03:28:06 -0700 | [diff] [blame] | 971 | |
| 972 | dst = __sk_dst_check(sk, 0); |
| 973 | if (!dst) |
| 974 | dst = inet_csk_rebuild_route(sk, &inet->cork.fl); |
| 975 | out: |
| 976 | return dst; |
| 977 | } |
| 978 | EXPORT_SYMBOL_GPL(inet_csk_update_pmtu); |