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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 | |
30d50c61 | 31 | struct dst_entry *inet6_csk_route_req(const struct sock *sk, |
3840a06e | 32 | struct flowi6 *fl6, |
f76b33c3 ED |
33 | const struct request_sock *req, |
34 | u8 proto) | |
ae4694b2 | 35 | { |
634fb979 | 36 | struct inet_request_sock *ireq = inet_rsk(req); |
f76b33c3 | 37 | const struct ipv6_pinfo *np = inet6_sk(sk); |
ae4694b2 DM |
38 | struct in6_addr *final_p, final; |
39 | struct dst_entry *dst; | |
4c9483b2 | 40 | |
3840a06e | 41 | memset(fl6, 0, sizeof(*fl6)); |
f76b33c3 | 42 | fl6->flowi6_proto = proto; |
634fb979 | 43 | fl6->daddr = ireq->ir_v6_rmt_addr; |
45f6fad8 ED |
44 | rcu_read_lock(); |
45 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); | |
46 | rcu_read_unlock(); | |
634fb979 ED |
47 | fl6->saddr = ireq->ir_v6_loc_addr; |
48 | fl6->flowi6_oif = ireq->ir_iif; | |
84f39b08 | 49 | fl6->flowi6_mark = ireq->ir_mark; |
634fb979 | 50 | fl6->fl6_dport = ireq->ir_rmt_port; |
b44084c2 | 51 | fl6->fl6_sport = htons(ireq->ir_num); |
e2d118a1 | 52 | fl6->flowi6_uid = sk->sk_uid; |
3840a06e | 53 | security_req_classify_flow(req, flowi6_to_flowi(fl6)); |
4c9483b2 | 54 | |
0e0d44ab | 55 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
68d0c6d3 | 56 | if (IS_ERR(dst)) |
ae4694b2 DM |
57 | return NULL; |
58 | ||
59 | return dst; | |
60 | } | |
f76b33c3 | 61 | EXPORT_SYMBOL(inet6_csk_route_req); |
ae4694b2 | 62 | |
67ba4152 | 63 | void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) |
b9750ce1 | 64 | { |
b9750ce1 ACM |
65 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
66 | ||
67 | sin6->sin6_family = AF_INET6; | |
efe4208f | 68 | sin6->sin6_addr = sk->sk_v6_daddr; |
c720c7e8 | 69 | sin6->sin6_port = inet_sk(sk)->inet_dport; |
b9750ce1 ACM |
70 | /* We do not store received flowlabel for TCP */ |
71 | sin6->sin6_flowinfo = 0; | |
842df073 HFS |
72 | sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
73 | sk->sk_bound_dev_if); | |
b9750ce1 | 74 | } |
b9750ce1 ACM |
75 | EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
76 | ||
a47ed4cd NT |
77 | static inline |
78 | struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) | |
79 | { | |
6f3118b5 | 80 | return __sk_dst_check(sk, cookie); |
a47ed4cd NT |
81 | } |
82 | ||
d3818c92 ED |
83 | static struct dst_entry *inet6_csk_route_socket(struct sock *sk, |
84 | struct flowi6 *fl6) | |
b9750ce1 | 85 | { |
b9750ce1 ACM |
86 | struct inet_sock *inet = inet_sk(sk); |
87 | struct ipv6_pinfo *np = inet6_sk(sk); | |
20c59de2 | 88 | struct in6_addr *final_p, final; |
35ad9b9c | 89 | struct dst_entry *dst; |
b9750ce1 | 90 | |
d3818c92 ED |
91 | memset(fl6, 0, sizeof(*fl6)); |
92 | fl6->flowi6_proto = sk->sk_protocol; | |
efe4208f | 93 | fl6->daddr = sk->sk_v6_daddr; |
d3818c92 ED |
94 | fl6->saddr = np->saddr; |
95 | fl6->flowlabel = np->flow_label; | |
96 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); | |
97 | fl6->flowi6_oif = sk->sk_bound_dev_if; | |
98 | fl6->flowi6_mark = sk->sk_mark; | |
99 | fl6->fl6_sport = inet->inet_sport; | |
100 | fl6->fl6_dport = inet->inet_dport; | |
e2d118a1 | 101 | fl6->flowi6_uid = sk->sk_uid; |
d3818c92 | 102 | security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); |
b9750ce1 | 103 | |
45f6fad8 ED |
104 | rcu_read_lock(); |
105 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); | |
106 | rcu_read_unlock(); | |
b9750ce1 | 107 | |
a47ed4cd | 108 | dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
35ad9b9c | 109 | if (!dst) { |
0e0d44ab | 110 | dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
b9750ce1 | 111 | |
35ad9b9c | 112 | if (!IS_ERR(dst)) |
6bd4f355 | 113 | ip6_dst_store(sk, dst, NULL, NULL); |
35ad9b9c DM |
114 | } |
115 | return dst; | |
116 | } | |
b9750ce1 | 117 | |
b0270e91 | 118 | int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused) |
35ad9b9c | 119 | { |
35ad9b9c DM |
120 | struct ipv6_pinfo *np = inet6_sk(sk); |
121 | struct flowi6 fl6; | |
122 | struct dst_entry *dst; | |
123 | int res; | |
124 | ||
d3818c92 | 125 | dst = inet6_csk_route_socket(sk, &fl6); |
35ad9b9c DM |
126 | if (IS_ERR(dst)) { |
127 | sk->sk_err_soft = -PTR_ERR(dst); | |
128 | sk->sk_route_caps = 0; | |
129 | kfree_skb(skb); | |
130 | return PTR_ERR(dst); | |
b9750ce1 ACM |
131 | } |
132 | ||
d14730b8 ED |
133 | rcu_read_lock(); |
134 | skb_dst_set_noref(skb, dst); | |
b9750ce1 ACM |
135 | |
136 | /* Restore final destination back after routing done */ | |
efe4208f | 137 | fl6.daddr = sk->sk_v6_daddr; |
b9750ce1 | 138 | |
92e55f41 | 139 | res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt), |
45f6fad8 | 140 | np->tclass); |
d14730b8 ED |
141 | rcu_read_unlock(); |
142 | return res; | |
b9750ce1 | 143 | } |
b9750ce1 | 144 | EXPORT_SYMBOL_GPL(inet6_csk_xmit); |
35ad9b9c DM |
145 | |
146 | struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) | |
147 | { | |
d3818c92 ED |
148 | struct flowi6 fl6; |
149 | struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6); | |
35ad9b9c DM |
150 | |
151 | if (IS_ERR(dst)) | |
152 | return NULL; | |
6700c270 | 153 | dst->ops->update_pmtu(dst, sk, NULL, mtu); |
35ad9b9c | 154 | |
b4dd0067 ED |
155 | dst = inet6_csk_route_socket(sk, &fl6); |
156 | return IS_ERR(dst) ? NULL : dst; | |
35ad9b9c DM |
157 | } |
158 | EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |