/* * 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(const struct sock *sk, struct request_sock ***prevp, const __be16 rport, const struct in6_addr *raddr, const struct in6_addr *laddr, const int iif) { const struct inet_connection_sock *icsk = inet_csk(sk); struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt; struct request_sock *req, **prev; for (prev = &lopt->syn_table[inet6_synq_hash(raddr, rport, lopt->hash_rnd, lopt->nr_table_entries)]; (req = *prev) != NULL; prev = &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)) { WARN_ON(req->sk != NULL); *prevp = prev; return req; } } return NULL; } 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);