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authorArnaldo Carvalho de Melo <acme@mandriva.com>2005-08-12 08:26:18 -0400
committerDavid S. Miller <davem@sunset.davemloft.net>2005-08-29 18:57:29 -0400
commit5324a040ccc708998e61ea93e669b81312f0ae11 (patch)
tree08e40652e7c9394277a0b5e08148c43a97d46670 /net/ipv6
parent505cbfc577f3fa778005e2800b869eca25727d5f (diff)
[INET6_HASHTABLES]: Move inet6_lookup functions to net/ipv6/inet6_hashtables.c
Doing this we allow tcp_diag to support IPV6 even if tcp_diag is compiled statically and IPV6 is compiled as a module, removing the previous restriction while not building any IPV6 code if it is not selected. Now to work on the tcpdiag_register infrastructure and then to rename the whole thing to inetdiag, reflecting its by then completely generic nature. Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
-rw-r--r--net/ipv6/Makefile2
-rw-r--r--net/ipv6/inet6_hashtables.c81
-rw-r--r--net/ipv6/tcp_ipv6.c154
3 files changed, 84 insertions, 153 deletions
diff --git a/net/ipv6/Makefile b/net/ipv6/Makefile
index 5bccea2d81b4..6460eec834b7 100644
--- a/net/ipv6/Makefile
+++ b/net/ipv6/Makefile
@@ -23,3 +23,5 @@ obj-$(CONFIG_NETFILTER) += netfilter/
23obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o 23obj-$(CONFIG_IPV6_TUNNEL) += ip6_tunnel.o
24 24
25obj-y += exthdrs_core.o 25obj-y += exthdrs_core.o
26
27obj-$(subst m,y,$(CONFIG_IPV6)) += inet6_hashtables.o
diff --git a/net/ipv6/inet6_hashtables.c b/net/ipv6/inet6_hashtables.c
new file mode 100644
index 000000000000..01d5f46d4e40
--- /dev/null
+++ b/net/ipv6/inet6_hashtables.c
@@ -0,0 +1,81 @@
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 * Generic INET6 transport hashtables
7 *
8 * Authors: Lotsa people, from code originally in tcp
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
16#include <linux/config.h>
17
18#include <linux/module.h>
19
20#include <net/inet_connection_sock.h>
21#include <net/inet_hashtables.h>
22#include <net/inet6_hashtables.h>
23
24struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
25 const struct in6_addr *daddr,
26 const unsigned short hnum, const int dif)
27{
28 struct sock *sk;
29 const struct hlist_node *node;
30 struct sock *result = NULL;
31 int score, hiscore = 0;
32
33 read_lock(&hashinfo->lhash_lock);
34 sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) {
35 if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) {
36 const struct ipv6_pinfo *np = inet6_sk(sk);
37
38 score = 1;
39 if (!ipv6_addr_any(&np->rcv_saddr)) {
40 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
41 continue;
42 score++;
43 }
44 if (sk->sk_bound_dev_if) {
45 if (sk->sk_bound_dev_if != dif)
46 continue;
47 score++;
48 }
49 if (score == 3) {
50 result = sk;
51 break;
52 }
53 if (score > hiscore) {
54 hiscore = score;
55 result = sk;
56 }
57 }
58 }
59 if (result)
60 sock_hold(result);
61 read_unlock(&hashinfo->lhash_lock);
62 return result;
63}
64
65EXPORT_SYMBOL_GPL(inet6_lookup_listener);
66
67struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
68 const struct in6_addr *saddr, const u16 sport,
69 const struct in6_addr *daddr, const u16 dport,
70 const int dif)
71{
72 struct sock *sk;
73
74 local_bh_disable();
75 sk = __inet6_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif);
76 local_bh_enable();
77
78 return sk;
79}
80
81EXPORT_SYMBOL_GPL(inet6_lookup);
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 2bc7fafe7668..fb291b81cf63 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -47,6 +47,7 @@
47 47
48#include <net/tcp.h> 48#include <net/tcp.h>
49#include <net/ndisc.h> 49#include <net/ndisc.h>
50#include <net/inet6_hashtables.h>
50#include <net/ipv6.h> 51#include <net/ipv6.h>
51#include <net/transp_v6.h> 52#include <net/transp_v6.h>
52#include <net/addrconf.h> 53#include <net/addrconf.h>
@@ -75,30 +76,6 @@ static int tcp_v6_xmit(struct sk_buff *skb, int ipfragok);
75static struct tcp_func ipv6_mapped; 76static struct tcp_func ipv6_mapped;
76static struct tcp_func ipv6_specific; 77static struct tcp_func ipv6_specific;
77 78
78/* I have no idea if this is a good hash for v6 or not. -DaveM */
79static inline int inet6_ehashfn(const struct in6_addr *laddr, const u16 lport,
80 const struct in6_addr *faddr, const u16 fport,
81 const int ehash_size)
82{
83 int hashent = (lport ^ fport);
84
85 hashent ^= (laddr->s6_addr32[3] ^ faddr->s6_addr32[3]);
86 hashent ^= hashent>>16;
87 hashent ^= hashent>>8;
88 return (hashent & (ehash_size - 1));
89}
90
91static inline int inet6_sk_ehashfn(const struct sock *sk, const int ehash_size)
92{
93 const struct inet_sock *inet = inet_sk(sk);
94 const struct ipv6_pinfo *np = inet6_sk(sk);
95 const struct in6_addr *laddr = &np->rcv_saddr;
96 const struct in6_addr *faddr = &np->daddr;
97 const __u16 lport = inet->num;
98 const __u16 fport = inet->dport;
99 return inet6_ehashfn(laddr, lport, faddr, fport, ehash_size);
100}
101
102static inline int tcp_v6_bind_conflict(const struct sock *sk, 79static inline int tcp_v6_bind_conflict(const struct sock *sk,
103 const struct inet_bind_bucket *tb) 80 const struct inet_bind_bucket *tb)
104{ 81{
@@ -259,135 +236,6 @@ static void tcp_v6_hash(struct sock *sk)
259 } 236 }
260} 237}
261 238
262static struct sock *inet6_lookup_listener(struct inet_hashinfo *hashinfo,
263 const struct in6_addr *daddr,
264 const unsigned short hnum,
265 const int dif)
266{
267 struct sock *sk;
268 struct hlist_node *node;
269 struct sock *result = NULL;
270 int score, hiscore;
271
272 hiscore=0;
273 read_lock(&hashinfo->lhash_lock);
274 sk_for_each(sk, node, &hashinfo->listening_hash[inet_lhashfn(hnum)]) {
275 if (inet_sk(sk)->num == hnum && sk->sk_family == PF_INET6) {
276 struct ipv6_pinfo *np = inet6_sk(sk);
277
278 score = 1;
279 if (!ipv6_addr_any(&np->rcv_saddr)) {
280 if (!ipv6_addr_equal(&np->rcv_saddr, daddr))
281 continue;
282 score++;
283 }
284 if (sk->sk_bound_dev_if) {
285 if (sk->sk_bound_dev_if != dif)
286 continue;
287 score++;
288 }
289 if (score == 3) {
290 result = sk;
291 break;
292 }
293 if (score > hiscore) {
294 hiscore = score;
295 result = sk;
296 }
297 }
298 }
299 if (result)
300 sock_hold(result);
301 read_unlock(&hashinfo->lhash_lock);
302 return result;
303}
304
305/* Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
306 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
307 *
308 * The sockhash lock must be held as a reader here.
309 */
310
311static inline struct sock *
312 __inet6_lookup_established(struct inet_hashinfo *hashinfo,
313 const struct in6_addr *saddr,
314 const u16 sport,
315 const struct in6_addr *daddr,
316 const u16 hnum,
317 const int dif)
318{
319 struct sock *sk;
320 const struct hlist_node *node;
321 const __u32 ports = INET_COMBINED_PORTS(sport, hnum);
322 /* Optimize here for direct hit, only listening connections can
323 * have wildcards anyways.
324 */
325 const int hash = inet6_ehashfn(daddr, hnum, saddr, sport,
326 hashinfo->ehash_size);
327 struct inet_ehash_bucket *head = &hashinfo->ehash[hash];
328
329 read_lock(&head->lock);
330 sk_for_each(sk, node, &head->chain) {
331 /* For IPV6 do the cheaper port and family tests first. */
332 if (INET6_MATCH(sk, saddr, daddr, ports, dif))
333 goto hit; /* You sunk my battleship! */
334 }
335 /* Must check for a TIME_WAIT'er before going to listener hash. */
336 sk_for_each(sk, node, &(head + hashinfo->ehash_size)->chain) {
337 const struct inet_timewait_sock *tw = inet_twsk(sk);
338
339 if(*((__u32 *)&(tw->tw_dport)) == ports &&
340 sk->sk_family == PF_INET6) {
341 const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
342
343 if (ipv6_addr_equal(&tcp6tw->tw_v6_daddr, saddr) &&
344 ipv6_addr_equal(&tcp6tw->tw_v6_rcv_saddr, daddr) &&
345 (!sk->sk_bound_dev_if || sk->sk_bound_dev_if == dif))
346 goto hit;
347 }
348 }
349 read_unlock(&head->lock);
350 return NULL;
351
352hit:
353 sock_hold(sk);
354 read_unlock(&head->lock);
355 return sk;
356}
357
358
359static inline struct sock *__inet6_lookup(struct inet_hashinfo *hashinfo,
360 const struct in6_addr *saddr,
361 const u16 sport,
362 const struct in6_addr *daddr,
363 const u16 hnum,
364 const int dif)
365{
366 struct sock *sk = __inet6_lookup_established(hashinfo, saddr, sport,
367 daddr, hnum, dif);
368 if (sk)
369 return sk;
370
371 return inet6_lookup_listener(hashinfo, daddr, hnum, dif);
372}
373
374inline struct sock *inet6_lookup(struct inet_hashinfo *hashinfo,
375 const struct in6_addr *saddr, const u16 sport,
376 const struct in6_addr *daddr, const u16 dport,
377 const int dif)
378{
379 struct sock *sk;
380
381 local_bh_disable();
382 sk = __inet6_lookup(hashinfo, saddr, sport, daddr, ntohs(dport), dif);
383 local_bh_enable();
384
385 return sk;
386}
387
388EXPORT_SYMBOL_GPL(inet6_lookup);
389
390
391/* 239/*
392 * Open request hash tables. 240 * Open request hash tables.
393 */ 241 */
generated by cgit v1.2.2 (git 2.25.0) at 2024-09-23 00:24:31 -0400