| /* |
| * 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 <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) |
| { |
| const struct sock *sk2; |
| const struct hlist_node *node; |
| |
| /* We must walk the whole port owner list in this case. -DaveM */ |
| sk_for_each_bound(sk2, node, &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) && |
| (!sk->sk_reuse || !sk2->sk_reuse || |
| sk2->sk_state == TCP_LISTEN) && |
| ipv6_rcv_saddr_equal(sk, sk2)) |
| break; |
| } |
| |
| return node != NULL; |
| } |
| |
| EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict); |
| |
| /* |
| * request_sock (formerly open request) hash tables. |
| */ |
| static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport, |
| const u32 rnd, const u16 synq_hsize) |
| { |
| u32 a = raddr->s6_addr32[0]; |
| u32 b = raddr->s6_addr32[1]; |
| u32 c = raddr->s6_addr32[2]; |
| |
| a += JHASH_GOLDEN_RATIO; |
| b += JHASH_GOLDEN_RATIO; |
| c += rnd; |
| __jhash_mix(a, b, c); |
| |
| a += raddr->s6_addr32[3]; |
| b += (__force u32)rport; |
| __jhash_mix(a, b, 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 inet6_request_sock *treq = inet6_rsk(req); |
| |
| if (inet_rsk(req)->rmt_port == rport && |
| req->rsk_ops->family == AF_INET6 && |
| ipv6_addr_equal(&treq->rmt_addr, raddr) && |
| ipv6_addr_equal(&treq->loc_addr, laddr) && |
| (!treq->iif || treq->iif == iif)) { |
| BUG_TRAP(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(&inet6_rsk(req)->rmt_addr, |
| inet_rsk(req)->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 ipv6_pinfo *np = inet6_sk(sk); |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr; |
| |
| sin6->sin6_family = AF_INET6; |
| ipv6_addr_copy(&sin6->sin6_addr, &np->daddr); |
| sin6->sin6_port = inet_sk(sk)->dport; |
| /* We do not store received flowlabel for TCP */ |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_scope_id = 0; |
| if (sk->sk_bound_dev_if && |
| ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| sin6->sin6_scope_id = sk->sk_bound_dev_if; |
| } |
| |
| EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr); |
| |
| int inet6_csk_xmit(struct sk_buff *skb, struct sock *sk, int ipfragok) |
| { |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct flowi fl; |
| struct dst_entry *dst; |
| struct in6_addr *final_p = NULL, final; |
| |
| memset(&fl, 0, sizeof(fl)); |
| fl.proto = sk->sk_protocol; |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| fl.fl6_flowlabel = np->flow_label; |
| IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); |
| fl.oif = sk->sk_bound_dev_if; |
| fl.fl_ip_sport = inet->sport; |
| fl.fl_ip_dport = inet->dport; |
| security_sk_classify_flow(sk, &fl); |
| |
| if (np->opt && np->opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| } |
| |
| dst = __sk_dst_check(sk, np->dst_cookie); |
| |
| if (dst == NULL) { |
| int err = ip6_dst_lookup(sk, &dst, &fl); |
| |
| if (err) { |
| sk->sk_err_soft = -err; |
| kfree_skb(skb); |
| return err; |
| } |
| |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| if ((err = xfrm_lookup(&dst, &fl, sk, 0)) < 0) { |
| sk->sk_route_caps = 0; |
| kfree_skb(skb); |
| return err; |
| } |
| |
| __ip6_dst_store(sk, dst, NULL, NULL); |
| } |
| |
| skb->dst = dst_clone(dst); |
| |
| /* Restore final destination back after routing done */ |
| ipv6_addr_copy(&fl.fl6_dst, &np->daddr); |
| |
| return ip6_xmit(sk, skb, &fl, np->opt, 0); |
| } |
| |
| EXPORT_SYMBOL_GPL(inet6_csk_xmit); |