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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> |
c125e80b | 29 | #include <net/sock_reuseport.h> |
8129765a | 30 | |
b9750ce1 | 31 | int inet6_csk_bind_conflict(const struct sock *sk, |
0643ee4f TH |
32 | const struct inet_bind_bucket *tb, bool relax, |
33 | bool reuseport_ok) | |
b9750ce1 ACM |
34 | { |
35 | const struct sock *sk2; | |
0643ee4f TH |
36 | bool reuse = !!sk->sk_reuse; |
37 | bool reuseport = !!sk->sk_reuseport && reuseport_ok; | |
243bb4c6 | 38 | kuid_t uid = sock_i_uid((struct sock *)sk); |
b9750ce1 ACM |
39 | |
40 | /* We must walk the whole port owner list in this case. -DaveM */ | |
7477fd2e PE |
41 | /* |
42 | * See comment in inet_csk_bind_conflict about sock lookup | |
43 | * vs net namespaces issues. | |
44 | */ | |
b67bfe0d | 45 | sk_for_each_bound(sk2, &tb->owners) { |
b9750ce1 ACM |
46 | if (sk != sk2 && |
47 | (!sk->sk_bound_dev_if || | |
48 | !sk2->sk_bound_dev_if || | |
5ba24953 TH |
49 | sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { |
50 | if ((!reuse || !sk2->sk_reuse || | |
51 | sk2->sk_state == TCP_LISTEN) && | |
52 | (!reuseport || !sk2->sk_reuseport || | |
c125e80b | 53 | rcu_access_pointer(sk->sk_reuseport_cb) || |
5ba24953 TH |
54 | (sk2->sk_state != TCP_TIME_WAIT && |
55 | !uid_eq(uid, | |
56 | sock_i_uid((struct sock *)sk2))))) { | |
e32ea7e7 | 57 | if (ipv6_rcv_saddr_equal(sk, sk2, true)) |
5ba24953 TH |
58 | break; |
59 | } | |
dd9f319d FL |
60 | if (!relax && reuse && sk2->sk_reuse && |
61 | sk2->sk_state != TCP_LISTEN && | |
e32ea7e7 | 62 | ipv6_rcv_saddr_equal(sk, sk2, true)) |
dd9f319d | 63 | break; |
5ba24953 | 64 | } |
b9750ce1 ACM |
65 | } |
66 | ||
b67bfe0d | 67 | return sk2 != NULL; |
b9750ce1 | 68 | } |
b9750ce1 ACM |
69 | EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); |
70 | ||
30d50c61 | 71 | struct dst_entry *inet6_csk_route_req(const struct sock *sk, |
3840a06e | 72 | struct flowi6 *fl6, |
f76b33c3 ED |
73 | const struct request_sock *req, |
74 | u8 proto) | |
ae4694b2 | 75 | { |
634fb979 | 76 | struct inet_request_sock *ireq = inet_rsk(req); |
f76b33c3 | 77 | const struct ipv6_pinfo *np = inet6_sk(sk); |
ae4694b2 DM |
78 | struct in6_addr *final_p, final; |
79 | struct dst_entry *dst; | |
4c9483b2 | 80 | |
3840a06e | 81 | memset(fl6, 0, sizeof(*fl6)); |
f76b33c3 | 82 | fl6->flowi6_proto = proto; |
634fb979 | 83 | fl6->daddr = ireq->ir_v6_rmt_addr; |
45f6fad8 ED |
84 | rcu_read_lock(); |
85 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); | |
86 | rcu_read_unlock(); | |
634fb979 ED |
87 | fl6->saddr = ireq->ir_v6_loc_addr; |
88 | fl6->flowi6_oif = ireq->ir_iif; | |
84f39b08 | 89 | fl6->flowi6_mark = ireq->ir_mark; |
634fb979 | 90 | fl6->fl6_dport = ireq->ir_rmt_port; |
b44084c2 | 91 | fl6->fl6_sport = htons(ireq->ir_num); |
e2d118a1 | 92 | fl6->flowi6_uid = sk->sk_uid; |
3840a06e | 93 | security_req_classify_flow(req, flowi6_to_flowi(fl6)); |
4c9483b2 | 94 | |
0e0d44ab | 95 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
68d0c6d3 | 96 | if (IS_ERR(dst)) |
ae4694b2 DM |
97 | return NULL; |
98 | ||
99 | return dst; | |
100 | } | |
f76b33c3 | 101 | EXPORT_SYMBOL(inet6_csk_route_req); |
ae4694b2 | 102 | |
67ba4152 | 103 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) |
b9750ce1 | 104 | { |
b9750ce1 ACM |
105 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
106 | ||
107 | sin6->sin6_family = AF_INET6; | |
efe4208f | 108 | sin6->sin6_addr = sk->sk_v6_daddr; |
c720c7e8 | 109 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
110 | /* We do not store received flowlabel for TCP */ |
111 | sin6->sin6_flowinfo = 0; | |
842df073 HFS |
112 | sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
113 | sk->sk_bound_dev_if); | |
b9750ce1 | 114 | } |
b9750ce1 ACM |
115 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
116 | ||
a47ed4cd NT |
117 | static inline |
118 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
119 | { | |
6f3118b5 | 120 | return __sk_dst_check(sk, cookie); |
a47ed4cd NT |
121 | } |
122 | ||
d3818c92 ED |
123 | static struct dst_entry *inet6_csk_route_socket(struct sock *sk, |
124 | struct flowi6 *fl6) | |
b9750ce1 | 125 | { |
b9750ce1 ACM |
126 | struct inet_sock *inet = inet_sk(sk); |
127 | struct ipv6_pinfo *np = inet6_sk(sk); | |
20c59de2 | 128 | struct in6_addr *final_p, final; |
35ad9b9c | 129 | struct dst_entry *dst; |
b9750ce1 | 130 | |
d3818c92 ED |
131 | memset(fl6, 0, sizeof(*fl6)); |
132 | fl6->flowi6_proto = sk->sk_protocol; | |
efe4208f | 133 | fl6->daddr = sk->sk_v6_daddr; |
d3818c92 ED |
134 | fl6->saddr = np->saddr; |
135 | fl6->flowlabel = np->flow_label; | |
136 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); | |
137 | fl6->flowi6_oif = sk->sk_bound_dev_if; | |
138 | fl6->flowi6_mark = sk->sk_mark; | |
139 | fl6->fl6_sport = inet->inet_sport; | |
140 | fl6->fl6_dport = inet->inet_dport; | |
e2d118a1 | 141 | fl6->flowi6_uid = sk->sk_uid; |
d3818c92 | 142 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); |
b9750ce1 | 143 | |
45f6fad8 ED |
144 | rcu_read_lock(); |
145 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); | |
146 | rcu_read_unlock(); | |
b9750ce1 | 147 | |
a47ed4cd | 148 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
35ad9b9c | 149 | if (!dst) { |
0e0d44ab | 150 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
b9750ce1 | 151 | |
35ad9b9c | 152 | if (!IS_ERR(dst)) |
6bd4f355 | 153 | ip6_dst_store(sk, dst, NULL, NULL); |
35ad9b9c DM |
154 | } |
155 | return dst; | |
156 | } | |
b9750ce1 | 157 | |
b0270e91 | 158 | int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused) |
35ad9b9c | 159 | { |
35ad9b9c DM |
160 | struct ipv6_pinfo *np = inet6_sk(sk); |
161 | struct flowi6 fl6; | |
162 | struct dst_entry *dst; | |
163 | int res; | |
164 | ||
d3818c92 | 165 | dst = inet6_csk_route_socket(sk, &fl6); |
35ad9b9c DM |
166 | if (IS_ERR(dst)) { |
167 | sk->sk_err_soft = -PTR_ERR(dst); | |
168 | sk->sk_route_caps = 0; | |
169 | kfree_skb(skb); | |
170 | return PTR_ERR(dst); | |
b9750ce1 ACM |
171 | } |
172 | ||
d14730b8 ED |
173 | rcu_read_lock(); |
174 | skb_dst_set_noref(skb, dst); | |
b9750ce1 ACM |
175 | |
176 | /* Restore final destination back after routing done */ | |
efe4208f | 177 | fl6.daddr = sk->sk_v6_daddr; |
b9750ce1 | 178 | |
92e55f41 | 179 | res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt), |
45f6fad8 | 180 | np->tclass); |
d14730b8 ED |
181 | rcu_read_unlock(); |
182 | return res; | |
b9750ce1 | 183 | } |
b9750ce1 | 184 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |
35ad9b9c DM |
185 | |
186 | struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) | |
187 | { | |
d3818c92 ED |
188 | struct flowi6 fl6; |
189 | struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6); | |
35ad9b9c DM |
190 | |
191 | if (IS_ERR(dst)) | |
192 | return NULL; | |
6700c270 | 193 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
35ad9b9c | 194 | |
b4dd0067 ED |
195 | dst = inet6_csk_route_socket(sk, &fl6); |
196 | return IS_ERR(dst) ? NULL : dst; | |
35ad9b9c DM |
197 | } |
198 | EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |