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8129765a ACM |
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 INET6 connection oriented protocols. | |
7 | * | |
8 | * Authors: See the TCPv6 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 | ||
8129765a ACM |
16 | #include <linux/module.h> |
17 | #include <linux/in6.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <linux/jhash.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
8129765a ACM |
21 | |
22 | #include <net/addrconf.h> | |
23 | #include <net/inet_connection_sock.h> | |
b9750ce1 ACM |
24 | #include <net/inet_ecn.h> |
25 | #include <net/inet_hashtables.h> | |
26 | #include <net/ip6_route.h> | |
8129765a | 27 | #include <net/sock.h> |
9f5336e2 | 28 | #include <net/inet6_connection_sock.h> |
8129765a | 29 | |
b9750ce1 | 30 | int inet6_csk_bind_conflict(const struct sock *sk, |
aacd9289 | 31 | const struct inet_bind_bucket *tb, bool relax) |
b9750ce1 ACM |
32 | { |
33 | const struct sock *sk2; | |
5ba24953 TH |
34 | int reuse = sk->sk_reuse; |
35 | int reuseport = sk->sk_reuseport; | |
243bb4c6 | 36 | kuid_t uid = sock_i_uid((struct sock *)sk); |
b9750ce1 ACM |
37 | |
38 | /* We must walk the whole port owner list in this case. -DaveM */ | |
7477fd2e PE |
39 | /* |
40 | * See comment in inet_csk_bind_conflict about sock lookup | |
41 | * vs net namespaces issues. | |
42 | */ | |
b67bfe0d | 43 | sk_for_each_bound(sk2, &tb->owners) { |
b9750ce1 ACM |
44 | if (sk != sk2 && |
45 | (!sk->sk_bound_dev_if || | |
46 | !sk2->sk_bound_dev_if || | |
5ba24953 TH |
47 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { |
48 | if ((!reuse || !sk2->sk_reuse || | |
49 | sk2->sk_state == TCP_LISTEN) && | |
50 | (!reuseport || !sk2->sk_reuseport || | |
51 | (sk2->sk_state != TCP_TIME_WAIT && | |
52 | !uid_eq(uid, | |
53 | sock_i_uid((struct sock *)sk2))))) { | |
e32ea7e7 | 54 | if (ipv6_rcv_saddr_equal(sk, sk2, true)) |
5ba24953 TH |
55 | break; |
56 | } | |
dd9f319d FL |
57 | if (!relax && reuse && sk2->sk_reuse && |
58 | sk2->sk_state != TCP_LISTEN && | |
e32ea7e7 | 59 | ipv6_rcv_saddr_equal(sk, sk2, true)) |
dd9f319d | 60 | break; |
5ba24953 | 61 | } |
b9750ce1 ACM |
62 | } |
63 | ||
b67bfe0d | 64 | return sk2 != NULL; |
b9750ce1 | 65 | } |
b9750ce1 ACM |
66 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); |
67 | ||
30d50c61 | 68 | struct dst_entry *inet6_csk_route_req(const struct sock *sk, |
3840a06e | 69 | struct flowi6 *fl6, |
f76b33c3 ED |
70 | const struct request_sock *req, |
71 | u8 proto) | |
ae4694b2 | 72 | { |
634fb979 | 73 | struct inet_request_sock *ireq = inet_rsk(req); |
f76b33c3 | 74 | const struct ipv6_pinfo *np = inet6_sk(sk); |
ae4694b2 DM |
75 | struct in6_addr *final_p, final; |
76 | struct dst_entry *dst; | |
4c9483b2 | 77 | |
3840a06e | 78 | memset(fl6, 0, sizeof(*fl6)); |
f76b33c3 | 79 | fl6->flowi6_proto = proto; |
634fb979 | 80 | fl6->daddr = ireq->ir_v6_rmt_addr; |
45f6fad8 ED |
81 | rcu_read_lock(); |
82 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); | |
83 | rcu_read_unlock(); | |
634fb979 ED |
84 | fl6->saddr = ireq->ir_v6_loc_addr; |
85 | fl6->flowi6_oif = ireq->ir_iif; | |
84f39b08 | 86 | fl6->flowi6_mark = ireq->ir_mark; |
634fb979 | 87 | fl6->fl6_dport = ireq->ir_rmt_port; |
b44084c2 | 88 | fl6->fl6_sport = htons(ireq->ir_num); |
3840a06e | 89 | security_req_classify_flow(req, flowi6_to_flowi(fl6)); |
4c9483b2 | 90 | |
0e0d44ab | 91 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
68d0c6d3 | 92 | if (IS_ERR(dst)) |
ae4694b2 DM |
93 | return NULL; |
94 | ||
95 | return dst; | |
96 | } | |
f76b33c3 | 97 | EXPORT_SYMBOL(inet6_csk_route_req); |
ae4694b2 | 98 | |
67ba4152 | 99 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) |
b9750ce1 | 100 | { |
b9750ce1 ACM |
101 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
102 | ||
103 | sin6->sin6_family = AF_INET6; | |
efe4208f | 104 | sin6->sin6_addr = sk->sk_v6_daddr; |
c720c7e8 | 105 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
106 | /* We do not store received flowlabel for TCP */ |
107 | sin6->sin6_flowinfo = 0; | |
842df073 HFS |
108 | sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
109 | sk->sk_bound_dev_if); | |
b9750ce1 | 110 | } |
b9750ce1 ACM |
111 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
112 | ||
a47ed4cd NT |
113 | static inline |
114 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
115 | { | |
6f3118b5 | 116 | return __sk_dst_check(sk, cookie); |
a47ed4cd NT |
117 | } |
118 | ||
d3818c92 ED |
119 | static struct dst_entry *inet6_csk_route_socket(struct sock *sk, |
120 | struct flowi6 *fl6) | |
b9750ce1 | 121 | { |
b9750ce1 ACM |
122 | struct inet_sock *inet = inet_sk(sk); |
123 | struct ipv6_pinfo *np = inet6_sk(sk); | |
20c59de2 | 124 | struct in6_addr *final_p, final; |
35ad9b9c | 125 | struct dst_entry *dst; |
b9750ce1 | 126 | |
d3818c92 ED |
127 | memset(fl6, 0, sizeof(*fl6)); |
128 | fl6->flowi6_proto = sk->sk_protocol; | |
efe4208f | 129 | fl6->daddr = sk->sk_v6_daddr; |
d3818c92 ED |
130 | fl6->saddr = np->saddr; |
131 | fl6->flowlabel = np->flow_label; | |
132 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); | |
133 | fl6->flowi6_oif = sk->sk_bound_dev_if; | |
134 | fl6->flowi6_mark = sk->sk_mark; | |
135 | fl6->fl6_sport = inet->inet_sport; | |
136 | fl6->fl6_dport = inet->inet_dport; | |
137 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); | |
b9750ce1 | 138 | |
45f6fad8 ED |
139 | rcu_read_lock(); |
140 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); | |
141 | rcu_read_unlock(); | |
b9750ce1 | 142 | |
a47ed4cd | 143 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
35ad9b9c | 144 | if (!dst) { |
0e0d44ab | 145 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
b9750ce1 | 146 | |
35ad9b9c | 147 | if (!IS_ERR(dst)) |
6bd4f355 | 148 | ip6_dst_store(sk, dst, NULL, NULL); |
35ad9b9c DM |
149 | } |
150 | return dst; | |
151 | } | |
b9750ce1 | 152 | |
b0270e91 | 153 | int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused) |
35ad9b9c | 154 | { |
35ad9b9c DM |
155 | struct ipv6_pinfo *np = inet6_sk(sk); |
156 | struct flowi6 fl6; | |
157 | struct dst_entry *dst; | |
158 | int res; | |
159 | ||
d3818c92 | 160 | dst = inet6_csk_route_socket(sk, &fl6); |
35ad9b9c DM |
161 | if (IS_ERR(dst)) { |
162 | sk->sk_err_soft = -PTR_ERR(dst); | |
163 | sk->sk_route_caps = 0; | |
164 | kfree_skb(skb); | |
165 | return PTR_ERR(dst); | |
b9750ce1 ACM |
166 | } |
167 | ||
d14730b8 ED |
168 | rcu_read_lock(); |
169 | skb_dst_set_noref(skb, dst); | |
b9750ce1 ACM |
170 | |
171 | /* Restore final destination back after routing done */ | |
efe4208f | 172 | fl6.daddr = sk->sk_v6_daddr; |
b9750ce1 | 173 | |
45f6fad8 ED |
174 | res = ip6_xmit(sk, skb, &fl6, rcu_dereference(np->opt), |
175 | np->tclass); | |
d14730b8 ED |
176 | rcu_read_unlock(); |
177 | return res; | |
b9750ce1 | 178 | } |
b9750ce1 | 179 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |
35ad9b9c DM |
180 | |
181 | struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) | |
182 | { | |
d3818c92 ED |
183 | struct flowi6 fl6; |
184 | struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6); | |
35ad9b9c DM |
185 | |
186 | if (IS_ERR(dst)) | |
187 | return NULL; | |
6700c270 | 188 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
35ad9b9c | 189 | |
b4dd0067 ED |
190 | dst = inet6_csk_route_socket(sk, &fl6); |
191 | return IS_ERR(dst) ? NULL : dst; | |
35ad9b9c DM |
192 | } |
193 | EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |