Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -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 | * Authors: Lotsa people, from code originally in tcp |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | */ |
| 13 | |
| 14 | #ifndef _INET_HASHTABLES_H |
| 15 | #define _INET_HASHTABLES_H |
| 16 | |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 17 | |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 18 | #include <linux/interrupt.h> |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 19 | #include <linux/ip.h> |
Arnaldo Carvalho de Melo | 33b6223 | 2005-08-09 20:09:06 -0700 | [diff] [blame] | 20 | #include <linux/ipv6.h> |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 21 | #include <linux/list.h> |
| 22 | #include <linux/slab.h> |
Arnaldo Carvalho de Melo | 33b6223 | 2005-08-09 20:09:06 -0700 | [diff] [blame] | 23 | #include <linux/socket.h> |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 24 | #include <linux/spinlock.h> |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 25 | #include <linux/types.h> |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 26 | #include <linux/wait.h> |
Eric Dumazet | 9e4505c | 2007-11-10 21:18:39 -0800 | [diff] [blame] | 27 | #include <linux/vmalloc.h> |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 28 | |
Arnaldo Carvalho de Melo | 463c84b | 2005-08-09 20:10:42 -0700 | [diff] [blame] | 29 | #include <net/inet_connection_sock.h> |
Arnaldo Carvalho de Melo | 14c8502 | 2005-12-27 02:43:12 -0200 | [diff] [blame] | 30 | #include <net/inet_sock.h> |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 31 | #include <net/sock.h> |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 32 | #include <net/route.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 33 | #include <net/tcp_states.h> |
Pavel Emelyanov | 0b44191 | 2008-06-16 17:14:11 -0700 | [diff] [blame] | 34 | #include <net/netns/hash.h> |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 35 | |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 36 | #include <asm/atomic.h> |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 37 | #include <asm/byteorder.h> |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 38 | |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 39 | /* This is for all connections with a full identity, no wildcards. |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 40 | * One chain is dedicated to TIME_WAIT sockets. |
| 41 | * I'll experiment with dynamic table growth later. |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 42 | */ |
| 43 | struct inet_ehash_bucket { |
Eric Dumazet | 3ab5aee | 2008-11-16 19:40:17 -0800 | [diff] [blame] | 44 | struct hlist_nulls_head chain; |
| 45 | struct hlist_nulls_head twchain; |
Eric Dumazet | 6d25536 | 2005-10-04 15:55:51 -0700 | [diff] [blame] | 46 | }; |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 47 | |
| 48 | /* There are a few simple rules, which allow for local port reuse by |
| 49 | * an application. In essence: |
| 50 | * |
| 51 | * 1) Sockets bound to different interfaces may share a local port. |
| 52 | * Failing that, goto test 2. |
| 53 | * 2) If all sockets have sk->sk_reuse set, and none of them are in |
| 54 | * TCP_LISTEN state, the port may be shared. |
| 55 | * Failing that, goto test 3. |
| 56 | * 3) If all sockets are bound to a specific inet_sk(sk)->rcv_saddr local |
| 57 | * address, and none of them are the same, the port may be |
| 58 | * shared. |
| 59 | * Failing this, the port cannot be shared. |
| 60 | * |
| 61 | * The interesting point, is test #2. This is what an FTP server does |
| 62 | * all day. To optimize this case we use a specific flag bit defined |
| 63 | * below. As we add sockets to a bind bucket list, we perform a |
| 64 | * check of: (newsk->sk_reuse && (newsk->sk_state != TCP_LISTEN)) |
| 65 | * As long as all sockets added to a bind bucket pass this test, |
| 66 | * the flag bit will be set. |
| 67 | * The resulting situation is that tcp_v[46]_verify_bind() can just check |
| 68 | * for this flag bit, if it is set and the socket trying to bind has |
| 69 | * sk->sk_reuse set, we don't even have to walk the owners list at all, |
| 70 | * we return that it is ok to bind this socket to the requested local port. |
| 71 | * |
| 72 | * Sounds like a lot of work, but it is worth it. In a more naive |
| 73 | * implementation (ie. current FreeBSD etc.) the entire list of ports |
| 74 | * must be walked for each data port opened by an ftp server. Needless |
| 75 | * to say, this does not scale at all. With a couple thousand FTP |
| 76 | * users logged onto your box, isn't it nice to know that new data |
| 77 | * ports are created in O(1) time? I thought so. ;-) -DaveM |
| 78 | */ |
| 79 | struct inet_bind_bucket { |
Eric Dumazet | 7a9546e | 2008-11-12 00:54:20 -0800 | [diff] [blame] | 80 | #ifdef CONFIG_NET_NS |
Pavel Emelyanov | 941b1d2 | 2008-01-31 05:05:50 -0800 | [diff] [blame] | 81 | struct net *ib_net; |
Eric Dumazet | 7a9546e | 2008-11-12 00:54:20 -0800 | [diff] [blame] | 82 | #endif |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 83 | unsigned short port; |
| 84 | signed short fastreuse; |
| 85 | struct hlist_node node; |
| 86 | struct hlist_head owners; |
| 87 | }; |
| 88 | |
Eric Dumazet | 7a9546e | 2008-11-12 00:54:20 -0800 | [diff] [blame] | 89 | static inline struct net *ib_net(struct inet_bind_bucket *ib) |
| 90 | { |
| 91 | return read_pnet(&ib->ib_net); |
| 92 | } |
| 93 | |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 94 | #define inet_bind_bucket_for_each(tb, node, head) \ |
| 95 | hlist_for_each_entry(tb, node, head, node) |
| 96 | |
| 97 | struct inet_bind_hashbucket { |
| 98 | spinlock_t lock; |
| 99 | struct hlist_head chain; |
| 100 | }; |
| 101 | |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 102 | /* |
| 103 | * Sockets can be hashed in established or listening table |
| 104 | * We must use different 'nulls' end-of-chain value for listening |
| 105 | * hash table, or we might find a socket that was closed and |
| 106 | * reallocated/inserted into established hash table |
| 107 | */ |
| 108 | #define LISTENING_NULLS_BASE (1U << 29) |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 109 | struct inet_listen_hashbucket { |
| 110 | spinlock_t lock; |
Eric Dumazet | c25eb3b | 2008-11-23 17:22:55 -0800 | [diff] [blame] | 111 | struct hlist_nulls_head head; |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 112 | }; |
| 113 | |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 114 | /* This is for listening sockets, thus all sockets which possess wildcards. */ |
| 115 | #define INET_LHTABLE_SIZE 32 /* Yes, really, this is all you need. */ |
| 116 | |
| 117 | struct inet_hashinfo { |
| 118 | /* This is for sockets with full identity only. Sockets here will |
| 119 | * always be without wildcards and will have the following invariant: |
| 120 | * |
| 121 | * TCP_ESTABLISHED <= sk->sk_state < TCP_CLOSE |
| 122 | * |
Eric Dumazet | dbca9b275 | 2007-02-08 14:16:46 -0800 | [diff] [blame] | 123 | * TIME_WAIT sockets use a separate chain (twchain). |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 124 | */ |
| 125 | struct inet_ehash_bucket *ehash; |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 126 | spinlock_t *ehash_locks; |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 127 | unsigned int ehash_size; |
| 128 | unsigned int ehash_locks_mask; |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 129 | |
| 130 | /* Ok, let's try this, I give up, we do need a local binding |
| 131 | * TCP hash as well as the others for fast bind/connect. |
| 132 | */ |
| 133 | struct inet_bind_hashbucket *bhash; |
| 134 | |
Stephen Hemminger | cfcabdc | 2007-10-09 01:59:42 -0700 | [diff] [blame] | 135 | unsigned int bhash_size; |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 136 | /* Note : 4 bytes padding on 64 bit arches */ |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 137 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 138 | struct kmem_cache *bind_bucket_cachep; |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 139 | |
| 140 | /* All the above members are written once at bootup and |
| 141 | * never written again _or_ are predominantly read-access. |
| 142 | * |
| 143 | * Now align to a new cache line as all the following members |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 144 | * might be often dirty. |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 145 | */ |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 146 | /* All sockets in TCP_LISTEN state will be in here. This is the only |
| 147 | * table where wildcard'd TCP sockets can exist. Hash function here |
| 148 | * is just local port number. |
| 149 | */ |
| 150 | struct inet_listen_hashbucket listening_hash[INET_LHTABLE_SIZE] |
| 151 | ____cacheline_aligned_in_smp; |
| 152 | |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 153 | }; |
| 154 | |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 155 | static inline struct inet_ehash_bucket *inet_ehash_bucket( |
| 156 | struct inet_hashinfo *hashinfo, |
| 157 | unsigned int hash) |
| 158 | { |
| 159 | return &hashinfo->ehash[hash & (hashinfo->ehash_size - 1)]; |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 160 | } |
| 161 | |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 162 | static inline spinlock_t *inet_ehash_lockp( |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 163 | struct inet_hashinfo *hashinfo, |
| 164 | unsigned int hash) |
| 165 | { |
| 166 | return &hashinfo->ehash_locks[hash & hashinfo->ehash_locks_mask]; |
| 167 | } |
| 168 | |
| 169 | static inline int inet_ehash_locks_alloc(struct inet_hashinfo *hashinfo) |
| 170 | { |
| 171 | unsigned int i, size = 256; |
| 172 | #if defined(CONFIG_PROVE_LOCKING) |
| 173 | unsigned int nr_pcpus = 2; |
| 174 | #else |
| 175 | unsigned int nr_pcpus = num_possible_cpus(); |
| 176 | #endif |
| 177 | if (nr_pcpus >= 4) |
| 178 | size = 512; |
| 179 | if (nr_pcpus >= 8) |
| 180 | size = 1024; |
| 181 | if (nr_pcpus >= 16) |
| 182 | size = 2048; |
| 183 | if (nr_pcpus >= 32) |
| 184 | size = 4096; |
| 185 | if (sizeof(rwlock_t) != 0) { |
| 186 | #ifdef CONFIG_NUMA |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 187 | if (size * sizeof(spinlock_t) > PAGE_SIZE) |
| 188 | hashinfo->ehash_locks = vmalloc(size * sizeof(spinlock_t)); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 189 | else |
| 190 | #endif |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 191 | hashinfo->ehash_locks = kmalloc(size * sizeof(spinlock_t), |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 192 | GFP_KERNEL); |
| 193 | if (!hashinfo->ehash_locks) |
| 194 | return ENOMEM; |
| 195 | for (i = 0; i < size; i++) |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 196 | spin_lock_init(&hashinfo->ehash_locks[i]); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 197 | } |
| 198 | hashinfo->ehash_locks_mask = size - 1; |
| 199 | return 0; |
| 200 | } |
| 201 | |
| 202 | static inline void inet_ehash_locks_free(struct inet_hashinfo *hashinfo) |
| 203 | { |
| 204 | if (hashinfo->ehash_locks) { |
| 205 | #ifdef CONFIG_NUMA |
| 206 | unsigned int size = (hashinfo->ehash_locks_mask + 1) * |
Eric Dumazet | 9db66bd | 2008-11-20 20:39:09 -0800 | [diff] [blame] | 207 | sizeof(spinlock_t); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 208 | if (size > PAGE_SIZE) |
| 209 | vfree(hashinfo->ehash_locks); |
| 210 | else |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 211 | #endif |
Pavel Emelyanov | 218ad12 | 2007-11-26 20:23:31 +0800 | [diff] [blame] | 212 | kfree(hashinfo->ehash_locks); |
Eric Dumazet | 230140c | 2007-11-07 02:40:20 -0800 | [diff] [blame] | 213 | hashinfo->ehash_locks = NULL; |
| 214 | } |
| 215 | } |
| 216 | |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 217 | extern struct inet_bind_bucket * |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 218 | inet_bind_bucket_create(struct kmem_cache *cachep, |
Pavel Emelyanov | 941b1d2 | 2008-01-31 05:05:50 -0800 | [diff] [blame] | 219 | struct net *net, |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 220 | struct inet_bind_hashbucket *head, |
| 221 | const unsigned short snum); |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 222 | extern void inet_bind_bucket_destroy(struct kmem_cache *cachep, |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 223 | struct inet_bind_bucket *tb); |
| 224 | |
Pavel Emelyanov | 7f635ab | 2008-06-16 17:12:49 -0700 | [diff] [blame] | 225 | static inline int inet_bhashfn(struct net *net, |
| 226 | const __u16 lport, const int bhash_size) |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 227 | { |
Pavel Emelyanov | 0b44191 | 2008-06-16 17:14:11 -0700 | [diff] [blame] | 228 | return (lport + net_hash_mix(net)) & (bhash_size - 1); |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 229 | } |
| 230 | |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 231 | extern void inet_bind_hash(struct sock *sk, struct inet_bind_bucket *tb, |
| 232 | const unsigned short snum); |
| 233 | |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 234 | /* These can have wildcards, don't try too hard. */ |
Pavel Emelyanov | 2086a65 | 2008-06-16 17:13:08 -0700 | [diff] [blame] | 235 | static inline int inet_lhashfn(struct net *net, const unsigned short num) |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 236 | { |
Pavel Emelyanov | 0b44191 | 2008-06-16 17:14:11 -0700 | [diff] [blame] | 237 | return (num + net_hash_mix(net)) & (INET_LHTABLE_SIZE - 1); |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 238 | } |
| 239 | |
| 240 | static inline int inet_sk_listen_hashfn(const struct sock *sk) |
| 241 | { |
Pavel Emelyanov | 2086a65 | 2008-06-16 17:13:08 -0700 | [diff] [blame] | 242 | return inet_lhashfn(sock_net(sk), inet_sk(sk)->num); |
Arnaldo Carvalho de Melo | 77d8bf9 | 2005-08-09 20:00:51 -0700 | [diff] [blame] | 243 | } |
| 244 | |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 245 | /* Caller must disable local BH processing. */ |
Pavel Emelyanov | 5308377 | 2008-04-17 23:18:15 -0700 | [diff] [blame] | 246 | extern void __inet_inherit_port(struct sock *sk, struct sock *child); |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 247 | |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 248 | extern void inet_put_port(struct sock *sk); |
Arnaldo Carvalho de Melo | 2d8c4ce | 2005-08-09 20:07:13 -0700 | [diff] [blame] | 249 | |
Eric Dumazet | 5caea4e | 2008-11-20 00:40:07 -0800 | [diff] [blame] | 250 | void inet_hashinfo_init(struct inet_hashinfo *h); |
Arnaldo Carvalho de Melo | f3f05f7 | 2005-08-09 20:08:09 -0700 | [diff] [blame] | 251 | |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 252 | extern void __inet_hash_nolisten(struct sock *sk); |
| 253 | extern void inet_hash(struct sock *sk); |
| 254 | extern void inet_unhash(struct sock *sk); |
Arnaldo Carvalho de Melo | 33b6223 | 2005-08-09 20:09:06 -0700 | [diff] [blame] | 255 | |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 256 | extern struct sock *__inet_lookup_listener(struct net *net, |
| 257 | struct inet_hashinfo *hashinfo, |
Al Viro | fb99c84 | 2006-09-27 18:43:33 -0700 | [diff] [blame] | 258 | const __be32 daddr, |
Herbert Xu | 8f491069 | 2006-08-09 15:47:12 -0700 | [diff] [blame] | 259 | const unsigned short hnum, |
| 260 | const int dif); |
| 261 | |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 262 | static inline struct sock *inet_lookup_listener(struct net *net, |
| 263 | struct inet_hashinfo *hashinfo, |
| 264 | __be32 daddr, __be16 dport, int dif) |
Herbert Xu | 8f491069 | 2006-08-09 15:47:12 -0700 | [diff] [blame] | 265 | { |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 266 | return __inet_lookup_listener(net, hashinfo, daddr, ntohs(dport), dif); |
Herbert Xu | 8f491069 | 2006-08-09 15:47:12 -0700 | [diff] [blame] | 267 | } |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 268 | |
| 269 | /* Socket demux engine toys. */ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 270 | /* What happens here is ugly; there's a pair of adjacent fields in |
| 271 | struct inet_sock; __be16 dport followed by __u16 num. We want to |
| 272 | search by pair, so we combine the keys into a single 32bit value |
| 273 | and compare with 32bit value read from &...->dport. Let's at least |
| 274 | make sure that it's not mixed with anything else... |
| 275 | On 64bit targets we combine comparisons with pair of adjacent __be32 |
| 276 | fields in the same way. |
| 277 | */ |
| 278 | typedef __u32 __bitwise __portpair; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 279 | #ifdef __BIG_ENDIAN |
| 280 | #define INET_COMBINED_PORTS(__sport, __dport) \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 281 | ((__force __portpair)(((__force __u32)(__be16)(__sport) << 16) | (__u32)(__dport))) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 282 | #else /* __LITTLE_ENDIAN */ |
| 283 | #define INET_COMBINED_PORTS(__sport, __dport) \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 284 | ((__force __portpair)(((__u32)(__dport) << 16) | (__force __u32)(__be16)(__sport))) |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 285 | #endif |
| 286 | |
| 287 | #if (BITS_PER_LONG == 64) |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 288 | typedef __u64 __bitwise __addrpair; |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 289 | #ifdef __BIG_ENDIAN |
| 290 | #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 291 | const __addrpair __name = (__force __addrpair) ( \ |
| 292 | (((__force __u64)(__be32)(__saddr)) << 32) | \ |
| 293 | ((__force __u64)(__be32)(__daddr))); |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 294 | #else /* __LITTLE_ENDIAN */ |
| 295 | #define INET_ADDR_COOKIE(__name, __saddr, __daddr) \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 296 | const __addrpair __name = (__force __addrpair) ( \ |
| 297 | (((__force __u64)(__be32)(__daddr)) << 32) | \ |
| 298 | ((__force __u64)(__be32)(__saddr))); |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 299 | #endif /* __BIG_ENDIAN */ |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 300 | #define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\ |
Eric Dumazet | f757fec | 2008-11-21 15:49:19 -0800 | [diff] [blame] | 301 | (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 302 | ((*((__addrpair *)&(inet_sk(__sk)->daddr))) == (__cookie)) && \ |
| 303 | ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 304 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 305 | #define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\ |
Eric Dumazet | f757fec | 2008-11-21 15:49:19 -0800 | [diff] [blame] | 306 | (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 307 | ((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \ |
| 308 | ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \ |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 309 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
| 310 | #else /* 32-bit arch */ |
| 311 | #define INET_ADDR_COOKIE(__name, __saddr, __daddr) |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 312 | #define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif) \ |
Eric Dumazet | f757fec | 2008-11-21 15:49:19 -0800 | [diff] [blame] | 313 | (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 314 | (inet_sk(__sk)->daddr == (__saddr)) && \ |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 315 | (inet_sk(__sk)->rcv_saddr == (__daddr)) && \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 316 | ((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \ |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 317 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 318 | #define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif) \ |
Eric Dumazet | f757fec | 2008-11-21 15:49:19 -0800 | [diff] [blame] | 319 | (((__sk)->sk_hash == (__hash)) && net_eq(sock_net(__sk), (__net)) && \ |
Eric Dumazet | 81c3d54 | 2005-10-03 14:13:38 -0700 | [diff] [blame] | 320 | (inet_twsk(__sk)->tw_daddr == (__saddr)) && \ |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 321 | (inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \ |
Al Viro | 4f765d8 | 2006-09-27 18:43:07 -0700 | [diff] [blame] | 322 | ((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \ |
Arnaldo Carvalho de Melo | 8feaf0c0 | 2005-08-09 20:09:30 -0700 | [diff] [blame] | 323 | (!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif)))) |
| 324 | #endif /* 64-bit arch */ |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 325 | |
| 326 | /* |
| 327 | * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so we need |
| 328 | * not check it for lookups anymore, thanks Alexey. -DaveM |
| 329 | * |
| 330 | * Local BH must be disabled here. |
| 331 | */ |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 332 | extern struct sock * __inet_lookup_established(struct net *net, |
| 333 | struct inet_hashinfo *hashinfo, |
Pavel Emelyanov | 77a5ba5 | 2007-12-20 15:32:17 -0800 | [diff] [blame] | 334 | const __be32 saddr, const __be16 sport, |
| 335 | const __be32 daddr, const u16 hnum, const int dif); |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 336 | |
Herbert Xu | 8f491069 | 2006-08-09 15:47:12 -0700 | [diff] [blame] | 337 | static inline struct sock * |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 338 | inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo, |
Al Viro | fb99c84 | 2006-09-27 18:43:33 -0700 | [diff] [blame] | 339 | const __be32 saddr, const __be16 sport, |
| 340 | const __be32 daddr, const __be16 dport, |
Herbert Xu | 8f491069 | 2006-08-09 15:47:12 -0700 | [diff] [blame] | 341 | const int dif) |
| 342 | { |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 343 | return __inet_lookup_established(net, hashinfo, saddr, sport, daddr, |
Herbert Xu | 8f491069 | 2006-08-09 15:47:12 -0700 | [diff] [blame] | 344 | ntohs(dport), dif); |
| 345 | } |
| 346 | |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 347 | static inline struct sock *__inet_lookup(struct net *net, |
| 348 | struct inet_hashinfo *hashinfo, |
Al Viro | fb99c84 | 2006-09-27 18:43:33 -0700 | [diff] [blame] | 349 | const __be32 saddr, const __be16 sport, |
| 350 | const __be32 daddr, const __be16 dport, |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 351 | const int dif) |
| 352 | { |
Herbert Xu | 8f491069 | 2006-08-09 15:47:12 -0700 | [diff] [blame] | 353 | u16 hnum = ntohs(dport); |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 354 | struct sock *sk = __inet_lookup_established(net, hashinfo, |
| 355 | saddr, sport, daddr, hnum, dif); |
| 356 | |
| 357 | return sk ? : __inet_lookup_listener(net, hashinfo, daddr, hnum, dif); |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 358 | } |
| 359 | |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 360 | static inline struct sock *inet_lookup(struct net *net, |
| 361 | struct inet_hashinfo *hashinfo, |
Al Viro | fb99c84 | 2006-09-27 18:43:33 -0700 | [diff] [blame] | 362 | const __be32 saddr, const __be16 sport, |
| 363 | const __be32 daddr, const __be16 dport, |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 364 | const int dif) |
| 365 | { |
| 366 | struct sock *sk; |
| 367 | |
| 368 | local_bh_disable(); |
Pavel Emelyanov | c67499c | 2008-01-31 05:06:40 -0800 | [diff] [blame] | 369 | sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif); |
Arnaldo Carvalho de Melo | e48c414 | 2005-08-09 20:09:46 -0700 | [diff] [blame] | 370 | local_bh_enable(); |
| 371 | |
| 372 | return sk; |
| 373 | } |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 374 | |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 375 | static inline struct sock *__inet_lookup_skb(struct inet_hashinfo *hashinfo, |
| 376 | struct sk_buff *skb, |
| 377 | const __be16 sport, |
| 378 | const __be16 dport) |
| 379 | { |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 380 | struct sock *sk; |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 381 | const struct iphdr *iph = ip_hdr(skb); |
| 382 | |
KOVACS Krisztian | 2354261 | 2008-10-07 12:41:01 -0700 | [diff] [blame] | 383 | if (unlikely(sk = skb_steal_sock(skb))) |
| 384 | return sk; |
| 385 | else |
| 386 | return __inet_lookup(dev_net(skb->dst->dev), hashinfo, |
| 387 | iph->saddr, sport, |
| 388 | iph->daddr, dport, inet_iif(skb)); |
Arnaldo Carvalho de Melo | 9a1f27c | 2008-10-07 11:41:57 -0700 | [diff] [blame] | 389 | } |
| 390 | |
Pavel Emelyanov | 5ee31fc | 2008-01-31 05:04:45 -0800 | [diff] [blame] | 391 | extern int __inet_hash_connect(struct inet_timewait_death_row *death_row, |
Pavel Emelyanov | 5d8c0aa | 2008-02-05 03:14:44 -0800 | [diff] [blame] | 392 | struct sock *sk, u32 port_offset, |
Pavel Emelyanov | 5ee31fc | 2008-01-31 05:04:45 -0800 | [diff] [blame] | 393 | int (*check_established)(struct inet_timewait_death_row *, |
| 394 | struct sock *, __u16, struct inet_timewait_sock **), |
Arnaldo Carvalho de Melo | ab1e0a1 | 2008-02-03 04:06:04 -0800 | [diff] [blame] | 395 | void (*hash)(struct sock *sk)); |
Arnaldo Carvalho de Melo | a7f5e7f | 2005-12-13 23:25:31 -0800 | [diff] [blame] | 396 | extern int inet_hash_connect(struct inet_timewait_death_row *death_row, |
| 397 | struct sock *sk); |
Arnaldo Carvalho de Melo | 304a161 | 2005-08-09 19:59:20 -0700 | [diff] [blame] | 398 | #endif /* _INET_HASHTABLES_H */ |