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16#include <linux/module.h>
17#include <linux/in6.h>
18#include <linux/ipv6.h>
19#include <linux/jhash.h>
20#include <linux/slab.h>
21
22#include <net/addrconf.h>
23#include <net/inet_connection_sock.h>
24#include <net/inet_ecn.h>
25#include <net/inet_hashtables.h>
26#include <net/ip6_route.h>
27#include <net/sock.h>
28#include <net/inet6_connection_sock.h>
29
30int inet6_csk_bind_conflict(const struct sock *sk,
31 const struct inet_bind_bucket *tb)
32{
33 const struct sock *sk2;
34 const struct hlist_node *node;
35
36
37
38
39
40
41 sk_for_each_bound(sk2, node, &tb->owners) {
42 if (sk != sk2 &&
43 (!sk->sk_bound_dev_if ||
44 !sk2->sk_bound_dev_if ||
45 sk->sk_bound_dev_if == sk2->sk_bound_dev_if) &&
46 (!sk->sk_reuse || !sk2->sk_reuse ||
47 ((1 << sk2->sk_state) & (TCPF_LISTEN | TCPF_CLOSE))) &&
48 ipv6_rcv_saddr_equal(sk, sk2))
49 break;
50 }
51
52 return node != NULL;
53}
54
55EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
56
57struct dst_entry *inet6_csk_route_req(struct sock *sk,
58 const struct request_sock *req)
59{
60 struct inet6_request_sock *treq = inet6_rsk(req);
61 struct ipv6_pinfo *np = inet6_sk(sk);
62 struct in6_addr *final_p, final;
63 struct dst_entry *dst;
64 struct flowi fl;
65
66 memset(&fl, 0, sizeof(fl));
67 fl.proto = IPPROTO_TCP;
68 ipv6_addr_copy(&fl.fl6_dst, &treq->rmt_addr);
69 final_p = fl6_update_dst(&fl, np->opt, &final);
70 ipv6_addr_copy(&fl.fl6_src, &treq->loc_addr);
71 fl.oif = sk->sk_bound_dev_if;
72 fl.mark = sk->sk_mark;
73 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
74 fl.fl_ip_sport = inet_rsk(req)->loc_port;
75 security_req_classify_flow(req, &fl);
76
77 if (ip6_dst_lookup(sk, &dst, &fl))
78 return NULL;
79
80 if (final_p)
81 ipv6_addr_copy(&fl.fl6_dst, final_p);
82
83 if ((xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0)
84 return NULL;
85
86 return dst;
87}
88
89
90
91
92static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
93 const u32 rnd, const u16 synq_hsize)
94{
95 u32 c;
96
97 c = jhash_3words((__force u32)raddr->s6_addr32[0],
98 (__force u32)raddr->s6_addr32[1],
99 (__force u32)raddr->s6_addr32[2],
100 rnd);
101
102 c = jhash_2words((__force u32)raddr->s6_addr32[3],
103 (__force u32)rport,
104 c);
105
106 return c & (synq_hsize - 1);
107}
108
109struct request_sock *inet6_csk_search_req(const struct sock *sk,
110 struct request_sock ***prevp,
111 const __be16 rport,
112 const struct in6_addr *raddr,
113 const struct in6_addr *laddr,
114 const int iif)
115{
116 const struct inet_connection_sock *icsk = inet_csk(sk);
117 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
118 struct request_sock *req, **prev;
119
120 for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport,
121 lopt->hash_rnd,
122 lopt->nr_table_entries)];
123 (req = *prev) != NULL;
124 prev = &req->dl_next) {
125 const struct inet6_request_sock *treq = inet6_rsk(req);
126
127 if (inet_rsk(req)->rmt_port == rport &&
128 req->rsk_ops->family == AF_INET6 &&
129 ipv6_addr_equal(&treq->rmt_addr, raddr) &&
130 ipv6_addr_equal(&treq->loc_addr, laddr) &&
131 (!treq->iif || treq->iif == iif)) {
132 WARN_ON(req->sk != NULL);
133 *prevp = prev;
134 return req;
135 }
136 }
137
138 return NULL;
139}
140
141EXPORT_SYMBOL_GPL(inet6_csk_search_req);
142
143void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
144 struct request_sock *req,
145 const unsigned long timeout)
146{
147 struct inet_connection_sock *icsk = inet_csk(sk);
148 struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
149 const u32 h = inet6_synq_hash(&inet6_rsk(req)->rmt_addr,
150 inet_rsk(req)->rmt_port,
151 lopt->hash_rnd, lopt->nr_table_entries);
152
153 reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
154 inet_csk_reqsk_queue_added(sk, timeout);
155}
156
157EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
158
159void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr * uaddr)
160{
161 struct ipv6_pinfo *np = inet6_sk(sk);
162 struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
163
164 sin6->sin6_family = AF_INET6;
165 ipv6_addr_copy(&sin6->sin6_addr, &np->daddr);
166 sin6->sin6_port = inet_sk(sk)->inet_dport;
167
168 sin6->sin6_flowinfo = 0;
169 sin6->sin6_scope_id = 0;
170 if (sk->sk_bound_dev_if &&
171 ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
172 sin6->sin6_scope_id = sk->sk_bound_dev_if;
173}
174
175EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
176
177static inline
178void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst,
179 struct in6_addr *daddr, struct in6_addr *saddr)
180{
181 __ip6_dst_store(sk, dst, daddr, saddr);
182
183#ifdef CONFIG_XFRM
184 {
185 struct rt6_info *rt = (struct rt6_info *)dst;
186 rt->rt6i_flow_cache_genid = atomic_read(&flow_cache_genid);
187 }
188#endif
189}
190
191static inline
192struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
193{
194 struct dst_entry *dst;
195
196 dst = __sk_dst_check(sk, cookie);
197
198#ifdef CONFIG_XFRM
199 if (dst) {
200 struct rt6_info *rt = (struct rt6_info *)dst;
201 if (rt->rt6i_flow_cache_genid != atomic_read(&flow_cache_genid)) {
202 __sk_dst_reset(sk);
203 dst = NULL;
204 }
205 }
206#endif
207
208 return dst;
209}
210
211int inet6_csk_xmit(struct sk_buff *skb)
212{
213 struct sock *sk = skb->sk;
214 struct inet_sock *inet = inet_sk(sk);
215 struct ipv6_pinfo *np = inet6_sk(sk);
216 struct flowi fl;
217 struct dst_entry *dst;
218 struct in6_addr *final_p, final;
219
220 memset(&fl, 0, sizeof(fl));
221 fl.proto = sk->sk_protocol;
222 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
223 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
224 fl.fl6_flowlabel = np->flow_label;
225 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
226 fl.oif = sk->sk_bound_dev_if;
227 fl.mark = sk->sk_mark;
228 fl.fl_ip_sport = inet->inet_sport;
229 fl.fl_ip_dport = inet->inet_dport;
230 security_sk_classify_flow(sk, &fl);
231
232 final_p = fl6_update_dst(&fl, np->opt, &final);
233
234 dst = __inet6_csk_dst_check(sk, np->dst_cookie);
235
236 if (dst == NULL) {
237 int err = ip6_dst_lookup(sk, &dst, &fl);
238
239 if (err) {
240 sk->sk_err_soft = -err;
241 kfree_skb(skb);
242 return err;
243 }
244
245 if (final_p)
246 ipv6_addr_copy(&fl.fl6_dst, final_p);
247
248 if ((err = xfrm_lookup(sock_net(sk), &dst, &fl, sk, 0)) < 0) {
249 sk->sk_route_caps = 0;
250 kfree_skb(skb);
251 return err;
252 }
253
254 __inet6_csk_dst_store(sk, dst, NULL, NULL);
255 }
256
257 skb_dst_set(skb, dst_clone(dst));
258
259
260 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
261
262 return ip6_xmit(sk, skb, &fl, np->opt);
263}
264
265EXPORT_SYMBOL_GPL(inet6_csk_xmit);
266
