| /* |
| * INET An implementation of the TCP/IP protocol suite for the LINUX |
| * operating system. INET is implemented using the BSD Socket |
| * interface as the means of communication with the user level. |
| * |
| * Support for INET6 connection oriented protocols. |
| * |
| * Authors: See the TCPv6 sources |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or(at your option) any later version. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/in6.h> |
| #include <linux/ipv6.h> |
| #include <linux/jhash.h> |
| #include <linux/slab.h> |
| |
| #include <net/addrconf.h> |
| #include <net/inet_connection_sock.h> |
| #include <net/inet_ecn.h> |
| #include <net/inet_hashtables.h> |
| #include <net/ip6_route.h> |
| #include <net/sock.h> |
| #include <net/inet6_connection_sock.h> |
| |
| int inet6_csk_bind_conflict(const struct sock *sk, |
| const struct inet_bind_bucket *tb, bool relax) |
| { |
| const struct sock *sk2; |
| int reuse = sk->sk_reuse; |
| int reuseport = sk->sk_reuseport; |
| kuid_t uid = sock_i_uid((struct sock *)sk); |
| |
| /* We must walk the whole port owner list in this case. -DaveM */ |
| /* |
| * See comment in inet_csk_bind_conflict about sock lookup |
| * vs net namespaces issues. |
| */ |
| sk_for_each_bound(sk2, &tb->owners) { |
| if (sk != sk2 && |
| (!sk->sk_bound_dev_if || |
| !sk2->sk_bound_dev_if || |
| sk->sk_bound_dev_if == sk2->sk_bound_dev_if)) { |
| if ((!reuse || !sk2->sk_reuse || |
| sk2->sk_state == TCP_LISTEN) && |
| (!reuseport || !sk2->sk_reuseport || |
| (sk2->sk_state != TCP_TIME_WAIT && |
| !uid_eq(uid, |
| sock_i_uid((struct sock *)sk2))))) { |
| if (ipv6_rcv_saddr_equal(sk, sk2)) |
| break; |
| } |
| if (!relax && reuse && sk2->sk_reuse && |
| sk2->sk_state != TCP_LISTEN && |
| ipv6_rcv_saddr_equal(sk, sk2)) |
| break; |
| } |
| } |
| |
| return sk2 != NULL; |
| } |
| EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); |
| |
| struct dst_entry *inet6_csk_route_req(struct sock *sk, |
| struct flowi6 *fl6, |
| const struct request_sock *req) |
| { |
| struct inet_request_sock *ireq = inet_rsk(req); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct in6_addr *final_p, final; |
| struct dst_entry *dst; |
| |
| memset(fl6, 0, sizeof(*fl6)); |
| fl6->flowi6_proto = IPPROTO_TCP; |
| fl6->daddr = ireq->ir_v6_rmt_addr; |
| final_p = fl6_update_dst(fl6, np->opt, &final); |
| fl6->saddr = ireq->ir_v6_loc_addr; |
| fl6->flowi6_oif = ireq->ir_iif; |
| fl6->flowi6_mark = ireq->ir_mark; |
| fl6->fl6_dport = ireq->ir_rmt_port; |
| fl6->fl6_sport = htons(ireq->ir_num); |
| security_req_classify_flow(req, flowi6_to_flowi(fl6)); |
| |
| dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
| if (IS_ERR(dst)) |
| return NULL; |
| |
| return dst; |
| } |
| |
| /* |
| * request_sock (formerly open request) hash tables. |
| */ |
| static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
| const u32 rnd, const u32 synq_hsize) |
| { |
| u32 c; |
| |
| c = jhash_3words((__force u32)raddr->s6_addr32[0], |
| (__force u32)raddr->s6_addr32[1], |
| (__force u32)raddr->s6_addr32[2], |
| rnd); |
| |
| c = jhash_2words((__force u32)raddr->s6_addr32[3], |
| (__force u32)rport, |
| c); |
| |
| return c & (synq_hsize - 1); |
| } |
| |
| struct request_sock *inet6_csk_search_req(struct sock *sk, |
| const __be16 rport, |
| const struct in6_addr *raddr, |
| const struct in6_addr *laddr, |
| const int iif) |
| { |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
| struct request_sock *req; |
| u32 hash = inet6_synq_hash(raddr, rport, lopt->hash_rnd, |
| lopt->nr_table_entries); |
| |
| spin_lock(&icsk->icsk_accept_queue.syn_wait_lock); |
| for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) { |
| const struct inet_request_sock *ireq = inet_rsk(req); |
| |
| if (ireq->ir_rmt_port == rport && |
| req->rsk_ops->family == AF_INET6 && |
| ipv6_addr_equal(&ireq->ir_v6_rmt_addr, raddr) && |
| ipv6_addr_equal(&ireq->ir_v6_loc_addr, laddr) && |
| (!ireq->ir_iif || ireq->ir_iif == iif)) { |
| atomic_inc(&req->rsk_refcnt); |
| WARN_ON(req->sk != NULL); |
| break; |
| } |
| } |
| spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock); |
| |
| return req; |
| } |
| EXPORT_SYMBOL_GPL(inet6_csk_search_req); |
| |
| void inet6_csk_reqsk_queue_hash_add(struct sock *sk, |
| struct request_sock *req, |
| const unsigned long timeout) |
| { |
| struct inet_connection_sock *icsk = inet_csk(sk); |
| struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; |
| const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr, |
| inet_rsk(req)->ir_rmt_port, |
| lopt->hash_rnd, lopt->nr_table_entries); |
| |
| reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout); |
| inet_csk_reqsk_queue_added(sk, timeout); |
| } |
| EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add); |
| |
| void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr) |
| { |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
| |
| sin6->sin6_family = AF_INET6; |
| sin6->sin6_addr = sk->sk_v6_daddr; |
| sin6->sin6_port = inet_sk(sk)->inet_dport; |
| /* We do not store received flowlabel for TCP */ |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr, |
| sk->sk_bound_dev_if); |
| } |
| EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
| |
| static inline |
| void __inet6_csk_dst_store(struct sock *sk, struct dst_entry *dst, |
| const struct in6_addr *daddr, |
| const struct in6_addr *saddr) |
| { |
| __ip6_dst_store(sk, dst, daddr, saddr); |
| } |
| |
| static inline |
| struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie) |
| { |
| return __sk_dst_check(sk, cookie); |
| } |
| |
| static struct dst_entry *inet6_csk_route_socket(struct sock *sk, |
| struct flowi6 *fl6) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct in6_addr *final_p, final; |
| struct dst_entry *dst; |
| |
| memset(fl6, 0, sizeof(*fl6)); |
| fl6->flowi6_proto = sk->sk_protocol; |
| fl6->daddr = sk->sk_v6_daddr; |
| fl6->saddr = np->saddr; |
| fl6->flowlabel = np->flow_label; |
| IP6_ECN_flow_xmit(sk, fl6->flowlabel); |
| fl6->flowi6_oif = sk->sk_bound_dev_if; |
| fl6->flowi6_mark = sk->sk_mark; |
| fl6->fl6_sport = inet->inet_sport; |
| fl6->fl6_dport = inet->inet_dport; |
| security_sk_classify_flow(sk, flowi6_to_flowi(fl6)); |
| |
| final_p = fl6_update_dst(fl6, np->opt, &final); |
| |
| dst = __inet6_csk_dst_check(sk, np->dst_cookie); |
| if (!dst) { |
| dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
| |
| if (!IS_ERR(dst)) |
| __inet6_csk_dst_store(sk, dst, NULL, NULL); |
| } |
| return dst; |
| } |
| |
| int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct flowi6 fl6; |
| struct dst_entry *dst; |
| int res; |
| |
| dst = inet6_csk_route_socket(sk, &fl6); |
| if (IS_ERR(dst)) { |
| sk->sk_err_soft = -PTR_ERR(dst); |
| sk->sk_route_caps = 0; |
| kfree_skb(skb); |
| return PTR_ERR(dst); |
| } |
| |
| rcu_read_lock(); |
| skb_dst_set_noref(skb, dst); |
| |
| /* Restore final destination back after routing done */ |
| fl6.daddr = sk->sk_v6_daddr; |
| |
| res = ip6_xmit(sk, skb, &fl6, np->opt, np->tclass); |
| rcu_read_unlock(); |
| return res; |
| } |
| EXPORT_SYMBOL_GPL(inet6_csk_xmit); |
| |
| struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu) |
| { |
| struct flowi6 fl6; |
| struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6); |
| |
| if (IS_ERR(dst)) |
| return NULL; |
| dst->ops->update_pmtu(dst, sk, NULL, mtu); |
| |
| dst = inet6_csk_route_socket(sk, &fl6); |
| return IS_ERR(dst) ? NULL : dst; |
| } |
| EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |