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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Generic INET6 transport hashtables
8 *
9 * Authors: Lotsa people, from code originally in tcp, generalised here
10 * by Arnaldo Carvalho de Melo <acme@mandriva.com>
11 */
12
13#include <linux/module.h>
14#include <linux/random.h>
15
16#include <net/addrconf.h>
17#include <net/hotdata.h>
18#include <net/inet_connection_sock.h>
19#include <net/inet_hashtables.h>
20#include <net/inet6_hashtables.h>
21#include <net/secure_seq.h>
22#include <net/ip.h>
23#include <net/sock_reuseport.h>
24
25u32 inet6_ehashfn(const struct net *net,
26 const struct in6_addr *laddr, const u16 lport,
27 const struct in6_addr *faddr, const __be16 fport)
28{
29 u32 lhash, fhash;
30
31 net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret));
32 net_get_random_once(&tcp_ipv6_hash_secret, sizeof(tcp_ipv6_hash_secret));
33
34 lhash = (__force u32)laddr->s6_addr32[3];
35 fhash = __ipv6_addr_jhash(faddr, tcp_ipv6_hash_secret);
36
37 return __inet6_ehashfn(lhash, lport, fhash, fport,
38 inet6_ehash_secret + net_hash_mix(net));
39}
40EXPORT_SYMBOL_GPL(inet6_ehashfn);
41
42/*
43 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
44 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
45 *
46 * The sockhash lock must be held as a reader here.
47 */
48struct sock *__inet6_lookup_established(struct net *net,
49 struct inet_hashinfo *hashinfo,
50 const struct in6_addr *saddr,
51 const __be16 sport,
52 const struct in6_addr *daddr,
53 const u16 hnum,
54 const int dif, const int sdif)
55{
56 struct sock *sk;
57 const struct hlist_nulls_node *node;
58 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
59 /* Optimize here for direct hit, only listening connections can
60 * have wildcards anyways.
61 */
62 unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
63 unsigned int slot = hash & hashinfo->ehash_mask;
64 struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
65
66
67begin:
68 sk_nulls_for_each_rcu(sk, node, &head->chain) {
69 if (sk->sk_hash != hash)
70 continue;
71 if (!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))
72 continue;
73 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
74 goto out;
75
76 if (unlikely(!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))) {
77 sock_gen_put(sk);
78 goto begin;
79 }
80 goto found;
81 }
82 if (get_nulls_value(node) != slot)
83 goto begin;
84out:
85 sk = NULL;
86found:
87 return sk;
88}
89EXPORT_SYMBOL(__inet6_lookup_established);
90
91static inline int compute_score(struct sock *sk, struct net *net,
92 const unsigned short hnum,
93 const struct in6_addr *daddr,
94 const int dif, const int sdif)
95{
96 int score = -1;
97
98 if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
99 sk->sk_family == PF_INET6) {
100 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
101 return -1;
102
103 if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
104 return -1;
105
106 score = sk->sk_bound_dev_if ? 2 : 1;
107 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
108 score++;
109 }
110 return score;
111}
112
113/**
114 * inet6_lookup_reuseport() - execute reuseport logic on AF_INET6 socket if necessary.
115 * @net: network namespace.
116 * @sk: AF_INET6 socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP.
117 * @skb: context for a potential SK_REUSEPORT program.
118 * @doff: header offset.
119 * @saddr: source address.
120 * @sport: source port.
121 * @daddr: destination address.
122 * @hnum: destination port in host byte order.
123 * @ehashfn: hash function used to generate the fallback hash.
124 *
125 * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
126 * the selected sock or an error.
127 */
128struct sock *inet6_lookup_reuseport(struct net *net, struct sock *sk,
129 struct sk_buff *skb, int doff,
130 const struct in6_addr *saddr,
131 __be16 sport,
132 const struct in6_addr *daddr,
133 unsigned short hnum,
134 inet6_ehashfn_t *ehashfn)
135{
136 struct sock *reuse_sk = NULL;
137 u32 phash;
138
139 if (sk->sk_reuseport) {
140 phash = INDIRECT_CALL_INET(ehashfn, udp6_ehashfn, inet6_ehashfn,
141 net, daddr, hnum, saddr, sport);
142 reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
143 }
144 return reuse_sk;
145}
146EXPORT_SYMBOL_GPL(inet6_lookup_reuseport);
147
148/* called with rcu_read_lock() */
149static struct sock *inet6_lhash2_lookup(struct net *net,
150 struct inet_listen_hashbucket *ilb2,
151 struct sk_buff *skb, int doff,
152 const struct in6_addr *saddr,
153 const __be16 sport, const struct in6_addr *daddr,
154 const unsigned short hnum, const int dif, const int sdif)
155{
156 struct sock *sk, *result = NULL;
157 struct hlist_nulls_node *node;
158 int score, hiscore = 0;
159
160 sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
161 score = compute_score(sk, net, hnum, daddr, dif, sdif);
162 if (score > hiscore) {
163 result = inet6_lookup_reuseport(net, sk, skb, doff,
164 saddr, sport, daddr, hnum, inet6_ehashfn);
165 if (result)
166 return result;
167
168 result = sk;
169 hiscore = score;
170 }
171 }
172
173 return result;
174}
175
176struct sock *inet6_lookup_run_sk_lookup(struct net *net,
177 int protocol,
178 struct sk_buff *skb, int doff,
179 const struct in6_addr *saddr,
180 const __be16 sport,
181 const struct in6_addr *daddr,
182 const u16 hnum, const int dif,
183 inet6_ehashfn_t *ehashfn)
184{
185 struct sock *sk, *reuse_sk;
186 bool no_reuseport;
187
188 no_reuseport = bpf_sk_lookup_run_v6(net, protocol, saddr, sport,
189 daddr, hnum, dif, &sk);
190 if (no_reuseport || IS_ERR_OR_NULL(sk))
191 return sk;
192
193 reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
194 saddr, sport, daddr, hnum, ehashfn);
195 if (reuse_sk)
196 sk = reuse_sk;
197 return sk;
198}
199EXPORT_SYMBOL_GPL(inet6_lookup_run_sk_lookup);
200
201struct sock *inet6_lookup_listener(struct net *net,
202 struct inet_hashinfo *hashinfo,
203 struct sk_buff *skb, int doff,
204 const struct in6_addr *saddr,
205 const __be16 sport, const struct in6_addr *daddr,
206 const unsigned short hnum, const int dif, const int sdif)
207{
208 struct inet_listen_hashbucket *ilb2;
209 struct sock *result = NULL;
210 unsigned int hash2;
211
212 /* Lookup redirect from BPF */
213 if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
214 hashinfo == net->ipv4.tcp_death_row.hashinfo) {
215 result = inet6_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
216 saddr, sport, daddr, hnum, dif,
217 inet6_ehashfn);
218 if (result)
219 goto done;
220 }
221
222 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
223 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
224
225 result = inet6_lhash2_lookup(net, ilb2, skb, doff,
226 saddr, sport, daddr, hnum,
227 dif, sdif);
228 if (result)
229 goto done;
230
231 /* Lookup lhash2 with in6addr_any */
232 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
233 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
234
235 result = inet6_lhash2_lookup(net, ilb2, skb, doff,
236 saddr, sport, &in6addr_any, hnum,
237 dif, sdif);
238done:
239 if (IS_ERR(result))
240 return NULL;
241 return result;
242}
243EXPORT_SYMBOL_GPL(inet6_lookup_listener);
244
245struct sock *inet6_lookup(struct net *net, struct inet_hashinfo *hashinfo,
246 struct sk_buff *skb, int doff,
247 const struct in6_addr *saddr, const __be16 sport,
248 const struct in6_addr *daddr, const __be16 dport,
249 const int dif)
250{
251 struct sock *sk;
252 bool refcounted;
253
254 sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
255 ntohs(dport), dif, 0, &refcounted);
256 if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
257 sk = NULL;
258 return sk;
259}
260EXPORT_SYMBOL_GPL(inet6_lookup);
261
262static int __inet6_check_established(struct inet_timewait_death_row *death_row,
263 struct sock *sk, const __u16 lport,
264 struct inet_timewait_sock **twp)
265{
266 struct inet_hashinfo *hinfo = death_row->hashinfo;
267 struct inet_sock *inet = inet_sk(sk);
268 const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
269 const struct in6_addr *saddr = &sk->sk_v6_daddr;
270 const int dif = sk->sk_bound_dev_if;
271 struct net *net = sock_net(sk);
272 const int sdif = l3mdev_master_ifindex_by_index(net, dif);
273 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
274 const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
275 inet->inet_dport);
276 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
277 spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
278 struct sock *sk2;
279 const struct hlist_nulls_node *node;
280 struct inet_timewait_sock *tw = NULL;
281
282 spin_lock(lock);
283
284 sk_nulls_for_each(sk2, node, &head->chain) {
285 if (sk2->sk_hash != hash)
286 continue;
287
288 if (likely(inet6_match(net, sk2, saddr, daddr, ports,
289 dif, sdif))) {
290 if (sk2->sk_state == TCP_TIME_WAIT) {
291 tw = inet_twsk(sk2);
292 if (twsk_unique(sk, sk2, twp))
293 break;
294 }
295 goto not_unique;
296 }
297 }
298
299 /* Must record num and sport now. Otherwise we will see
300 * in hash table socket with a funny identity.
301 */
302 inet->inet_num = lport;
303 inet->inet_sport = htons(lport);
304 sk->sk_hash = hash;
305 WARN_ON(!sk_unhashed(sk));
306 __sk_nulls_add_node_rcu(sk, &head->chain);
307 if (tw) {
308 sk_nulls_del_node_init_rcu((struct sock *)tw);
309 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
310 }
311 spin_unlock(lock);
312 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
313
314 if (twp) {
315 *twp = tw;
316 } else if (tw) {
317 /* Silly. Should hash-dance instead... */
318 inet_twsk_deschedule_put(tw);
319 }
320 return 0;
321
322not_unique:
323 spin_unlock(lock);
324 return -EADDRNOTAVAIL;
325}
326
327static u64 inet6_sk_port_offset(const struct sock *sk)
328{
329 const struct inet_sock *inet = inet_sk(sk);
330
331 return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
332 sk->sk_v6_daddr.s6_addr32,
333 inet->inet_dport);
334}
335
336int inet6_hash_connect(struct inet_timewait_death_row *death_row,
337 struct sock *sk)
338{
339 u64 port_offset = 0;
340
341 if (!inet_sk(sk)->inet_num)
342 port_offset = inet6_sk_port_offset(sk);
343 return __inet_hash_connect(death_row, sk, port_offset,
344 __inet6_check_established);
345}
346EXPORT_SYMBOL_GPL(inet6_hash_connect);
347
348int inet6_hash(struct sock *sk)
349{
350 int err = 0;
351
352 if (sk->sk_state != TCP_CLOSE)
353 err = __inet_hash(sk, NULL);
354
355 return err;
356}
357EXPORT_SYMBOL_GPL(inet6_hash);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Generic INET6 transport hashtables
8 *
9 * Authors: Lotsa people, from code originally in tcp, generalised here
10 * by Arnaldo Carvalho de Melo <acme@mandriva.com>
11 */
12
13#include <linux/module.h>
14#include <linux/random.h>
15
16#include <net/addrconf.h>
17#include <net/hotdata.h>
18#include <net/inet_connection_sock.h>
19#include <net/inet_hashtables.h>
20#include <net/inet6_hashtables.h>
21#include <net/secure_seq.h>
22#include <net/ip.h>
23#include <net/sock_reuseport.h>
24#include <net/tcp.h>
25
26u32 inet6_ehashfn(const struct net *net,
27 const struct in6_addr *laddr, const u16 lport,
28 const struct in6_addr *faddr, const __be16 fport)
29{
30 u32 lhash, fhash;
31
32 net_get_random_once(&inet6_ehash_secret, sizeof(inet6_ehash_secret));
33 net_get_random_once(&tcp_ipv6_hash_secret, sizeof(tcp_ipv6_hash_secret));
34
35 lhash = (__force u32)laddr->s6_addr32[3];
36 fhash = __ipv6_addr_jhash(faddr, tcp_ipv6_hash_secret);
37
38 return __inet6_ehashfn(lhash, lport, fhash, fport,
39 inet6_ehash_secret + net_hash_mix(net));
40}
41EXPORT_SYMBOL_GPL(inet6_ehashfn);
42
43/*
44 * Sockets in TCP_CLOSE state are _always_ taken out of the hash, so
45 * we need not check it for TCP lookups anymore, thanks Alexey. -DaveM
46 *
47 * The sockhash lock must be held as a reader here.
48 */
49struct sock *__inet6_lookup_established(const struct net *net,
50 struct inet_hashinfo *hashinfo,
51 const struct in6_addr *saddr,
52 const __be16 sport,
53 const struct in6_addr *daddr,
54 const u16 hnum,
55 const int dif, const int sdif)
56{
57 struct sock *sk;
58 const struct hlist_nulls_node *node;
59 const __portpair ports = INET_COMBINED_PORTS(sport, hnum);
60 /* Optimize here for direct hit, only listening connections can
61 * have wildcards anyways.
62 */
63 unsigned int hash = inet6_ehashfn(net, daddr, hnum, saddr, sport);
64 unsigned int slot = hash & hashinfo->ehash_mask;
65 struct inet_ehash_bucket *head = &hashinfo->ehash[slot];
66
67
68begin:
69 sk_nulls_for_each_rcu(sk, node, &head->chain) {
70 if (sk->sk_hash != hash)
71 continue;
72 if (!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))
73 continue;
74 if (unlikely(!refcount_inc_not_zero(&sk->sk_refcnt)))
75 goto out;
76
77 if (unlikely(!inet6_match(net, sk, saddr, daddr, ports, dif, sdif))) {
78 sock_gen_put(sk);
79 goto begin;
80 }
81 goto found;
82 }
83 if (get_nulls_value(node) != slot)
84 goto begin;
85out:
86 sk = NULL;
87found:
88 return sk;
89}
90EXPORT_SYMBOL(__inet6_lookup_established);
91
92static inline int compute_score(struct sock *sk, const struct net *net,
93 const unsigned short hnum,
94 const struct in6_addr *daddr,
95 const int dif, const int sdif)
96{
97 int score = -1;
98
99 if (net_eq(sock_net(sk), net) && inet_sk(sk)->inet_num == hnum &&
100 sk->sk_family == PF_INET6) {
101 if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr))
102 return -1;
103
104 if (!inet_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
105 return -1;
106
107 score = sk->sk_bound_dev_if ? 2 : 1;
108 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
109 score++;
110 }
111 return score;
112}
113
114/**
115 * inet6_lookup_reuseport() - execute reuseport logic on AF_INET6 socket if necessary.
116 * @net: network namespace.
117 * @sk: AF_INET6 socket, must be in TCP_LISTEN state for TCP or TCP_CLOSE for UDP.
118 * @skb: context for a potential SK_REUSEPORT program.
119 * @doff: header offset.
120 * @saddr: source address.
121 * @sport: source port.
122 * @daddr: destination address.
123 * @hnum: destination port in host byte order.
124 * @ehashfn: hash function used to generate the fallback hash.
125 *
126 * Return: NULL if sk doesn't have SO_REUSEPORT set, otherwise a pointer to
127 * the selected sock or an error.
128 */
129struct sock *inet6_lookup_reuseport(const struct net *net, struct sock *sk,
130 struct sk_buff *skb, int doff,
131 const struct in6_addr *saddr,
132 __be16 sport,
133 const struct in6_addr *daddr,
134 unsigned short hnum,
135 inet6_ehashfn_t *ehashfn)
136{
137 struct sock *reuse_sk = NULL;
138 u32 phash;
139
140 if (sk->sk_reuseport) {
141 phash = INDIRECT_CALL_INET(ehashfn, udp6_ehashfn, inet6_ehashfn,
142 net, daddr, hnum, saddr, sport);
143 reuse_sk = reuseport_select_sock(sk, phash, skb, doff);
144 }
145 return reuse_sk;
146}
147EXPORT_SYMBOL_GPL(inet6_lookup_reuseport);
148
149/* called with rcu_read_lock() */
150static struct sock *inet6_lhash2_lookup(const struct net *net,
151 struct inet_listen_hashbucket *ilb2,
152 struct sk_buff *skb, int doff,
153 const struct in6_addr *saddr,
154 const __be16 sport, const struct in6_addr *daddr,
155 const unsigned short hnum, const int dif, const int sdif)
156{
157 struct sock *sk, *result = NULL;
158 struct hlist_nulls_node *node;
159 int score, hiscore = 0;
160
161 sk_nulls_for_each_rcu(sk, node, &ilb2->nulls_head) {
162 score = compute_score(sk, net, hnum, daddr, dif, sdif);
163 if (score > hiscore) {
164 result = inet6_lookup_reuseport(net, sk, skb, doff,
165 saddr, sport, daddr, hnum, inet6_ehashfn);
166 if (result)
167 return result;
168
169 result = sk;
170 hiscore = score;
171 }
172 }
173
174 return result;
175}
176
177struct sock *inet6_lookup_run_sk_lookup(const struct net *net,
178 int protocol,
179 struct sk_buff *skb, int doff,
180 const struct in6_addr *saddr,
181 const __be16 sport,
182 const struct in6_addr *daddr,
183 const u16 hnum, const int dif,
184 inet6_ehashfn_t *ehashfn)
185{
186 struct sock *sk, *reuse_sk;
187 bool no_reuseport;
188
189 no_reuseport = bpf_sk_lookup_run_v6(net, protocol, saddr, sport,
190 daddr, hnum, dif, &sk);
191 if (no_reuseport || IS_ERR_OR_NULL(sk))
192 return sk;
193
194 reuse_sk = inet6_lookup_reuseport(net, sk, skb, doff,
195 saddr, sport, daddr, hnum, ehashfn);
196 if (reuse_sk)
197 sk = reuse_sk;
198 return sk;
199}
200EXPORT_SYMBOL_GPL(inet6_lookup_run_sk_lookup);
201
202struct sock *inet6_lookup_listener(const struct net *net,
203 struct inet_hashinfo *hashinfo,
204 struct sk_buff *skb, int doff,
205 const struct in6_addr *saddr,
206 const __be16 sport, const struct in6_addr *daddr,
207 const unsigned short hnum, const int dif, const int sdif)
208{
209 struct inet_listen_hashbucket *ilb2;
210 struct sock *result = NULL;
211 unsigned int hash2;
212
213 /* Lookup redirect from BPF */
214 if (static_branch_unlikely(&bpf_sk_lookup_enabled) &&
215 hashinfo == net->ipv4.tcp_death_row.hashinfo) {
216 result = inet6_lookup_run_sk_lookup(net, IPPROTO_TCP, skb, doff,
217 saddr, sport, daddr, hnum, dif,
218 inet6_ehashfn);
219 if (result)
220 goto done;
221 }
222
223 hash2 = ipv6_portaddr_hash(net, daddr, hnum);
224 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
225
226 result = inet6_lhash2_lookup(net, ilb2, skb, doff,
227 saddr, sport, daddr, hnum,
228 dif, sdif);
229 if (result)
230 goto done;
231
232 /* Lookup lhash2 with in6addr_any */
233 hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum);
234 ilb2 = inet_lhash2_bucket(hashinfo, hash2);
235
236 result = inet6_lhash2_lookup(net, ilb2, skb, doff,
237 saddr, sport, &in6addr_any, hnum,
238 dif, sdif);
239done:
240 if (IS_ERR(result))
241 return NULL;
242 return result;
243}
244EXPORT_SYMBOL_GPL(inet6_lookup_listener);
245
246struct sock *inet6_lookup(const struct net *net,
247 struct inet_hashinfo *hashinfo,
248 struct sk_buff *skb, int doff,
249 const struct in6_addr *saddr, const __be16 sport,
250 const struct in6_addr *daddr, const __be16 dport,
251 const int dif)
252{
253 struct sock *sk;
254 bool refcounted;
255
256 sk = __inet6_lookup(net, hashinfo, skb, doff, saddr, sport, daddr,
257 ntohs(dport), dif, 0, &refcounted);
258 if (sk && !refcounted && !refcount_inc_not_zero(&sk->sk_refcnt))
259 sk = NULL;
260 return sk;
261}
262EXPORT_SYMBOL_GPL(inet6_lookup);
263
264static int __inet6_check_established(struct inet_timewait_death_row *death_row,
265 struct sock *sk, const __u16 lport,
266 struct inet_timewait_sock **twp)
267{
268 struct inet_hashinfo *hinfo = death_row->hashinfo;
269 struct inet_sock *inet = inet_sk(sk);
270 const struct in6_addr *daddr = &sk->sk_v6_rcv_saddr;
271 const struct in6_addr *saddr = &sk->sk_v6_daddr;
272 const int dif = sk->sk_bound_dev_if;
273 struct net *net = sock_net(sk);
274 const int sdif = l3mdev_master_ifindex_by_index(net, dif);
275 const __portpair ports = INET_COMBINED_PORTS(inet->inet_dport, lport);
276 const unsigned int hash = inet6_ehashfn(net, daddr, lport, saddr,
277 inet->inet_dport);
278 struct inet_ehash_bucket *head = inet_ehash_bucket(hinfo, hash);
279 spinlock_t *lock = inet_ehash_lockp(hinfo, hash);
280 struct sock *sk2;
281 const struct hlist_nulls_node *node;
282 struct inet_timewait_sock *tw = NULL;
283
284 spin_lock(lock);
285
286 sk_nulls_for_each(sk2, node, &head->chain) {
287 if (sk2->sk_hash != hash)
288 continue;
289
290 if (likely(inet6_match(net, sk2, saddr, daddr, ports,
291 dif, sdif))) {
292 if (sk2->sk_state == TCP_TIME_WAIT) {
293 tw = inet_twsk(sk2);
294 if (sk->sk_protocol == IPPROTO_TCP &&
295 tcp_twsk_unique(sk, sk2, twp))
296 break;
297 }
298 goto not_unique;
299 }
300 }
301
302 /* Must record num and sport now. Otherwise we will see
303 * in hash table socket with a funny identity.
304 */
305 inet->inet_num = lport;
306 inet->inet_sport = htons(lport);
307 sk->sk_hash = hash;
308 WARN_ON(!sk_unhashed(sk));
309 __sk_nulls_add_node_rcu(sk, &head->chain);
310 if (tw) {
311 sk_nulls_del_node_init_rcu((struct sock *)tw);
312 __NET_INC_STATS(net, LINUX_MIB_TIMEWAITRECYCLED);
313 }
314 spin_unlock(lock);
315 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
316
317 if (twp) {
318 *twp = tw;
319 } else if (tw) {
320 /* Silly. Should hash-dance instead... */
321 inet_twsk_deschedule_put(tw);
322 }
323 return 0;
324
325not_unique:
326 spin_unlock(lock);
327 return -EADDRNOTAVAIL;
328}
329
330static u64 inet6_sk_port_offset(const struct sock *sk)
331{
332 const struct inet_sock *inet = inet_sk(sk);
333
334 return secure_ipv6_port_ephemeral(sk->sk_v6_rcv_saddr.s6_addr32,
335 sk->sk_v6_daddr.s6_addr32,
336 inet->inet_dport);
337}
338
339int inet6_hash_connect(struct inet_timewait_death_row *death_row,
340 struct sock *sk)
341{
342 u64 port_offset = 0;
343
344 if (!inet_sk(sk)->inet_num)
345 port_offset = inet6_sk_port_offset(sk);
346 return __inet_hash_connect(death_row, sk, port_offset,
347 __inet6_check_established);
348}
349EXPORT_SYMBOL_GPL(inet6_hash_connect);
350
351int inet6_hash(struct sock *sk)
352{
353 int err = 0;
354
355 if (sk->sk_state != TCP_CLOSE)
356 err = __inet_hash(sk, NULL);
357
358 return err;
359}
360EXPORT_SYMBOL_GPL(inet6_hash);