155 lines
4.2 KiB
C
155 lines
4.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* Support for INET6 connection oriented protocols.
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*
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* Authors: See the TCPv6 sources
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*/
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#include <linux/module.h>
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#include <linux/in6.h>
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#include <linux/ipv6.h>
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#include <linux/jhash.h>
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#include <linux/slab.h>
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#include <net/addrconf.h>
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#include <net/inet_connection_sock.h>
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#include <net/inet_ecn.h>
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#include <net/inet_hashtables.h>
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#include <net/ip6_route.h>
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#include <net/sock.h>
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#include <net/inet6_connection_sock.h>
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#include <net/sock_reuseport.h>
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struct dst_entry *inet6_csk_route_req(const struct sock *sk,
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struct flowi6 *fl6,
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const struct request_sock *req,
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u8 proto)
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{
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struct inet_request_sock *ireq = inet_rsk(req);
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const struct ipv6_pinfo *np = inet6_sk(sk);
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struct in6_addr *final_p, final;
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struct dst_entry *dst;
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memset(fl6, 0, sizeof(*fl6));
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fl6->flowi6_proto = proto;
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fl6->daddr = ireq->ir_v6_rmt_addr;
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rcu_read_lock();
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final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
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rcu_read_unlock();
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fl6->saddr = ireq->ir_v6_loc_addr;
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fl6->flowi6_oif = ireq->ir_iif;
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fl6->flowi6_mark = ireq->ir_mark;
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fl6->fl6_dport = ireq->ir_rmt_port;
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fl6->fl6_sport = htons(ireq->ir_num);
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fl6->flowi6_uid = sk->sk_uid;
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security_req_classify_flow(req, flowi6_to_flowi_common(fl6));
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dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
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if (IS_ERR(dst))
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return NULL;
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return dst;
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}
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EXPORT_SYMBOL(inet6_csk_route_req);
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void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
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{
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struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;
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sin6->sin6_family = AF_INET6;
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sin6->sin6_addr = sk->sk_v6_daddr;
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sin6->sin6_port = inet_sk(sk)->inet_dport;
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/* We do not store received flowlabel for TCP */
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sin6->sin6_flowinfo = 0;
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sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
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sk->sk_bound_dev_if);
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}
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EXPORT_SYMBOL_GPL(inet6_csk_addr2sockaddr);
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static inline
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struct dst_entry *__inet6_csk_dst_check(struct sock *sk, u32 cookie)
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{
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return __sk_dst_check(sk, cookie);
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}
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static struct dst_entry *inet6_csk_route_socket(struct sock *sk,
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struct flowi6 *fl6)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct in6_addr *final_p, final;
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struct dst_entry *dst;
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memset(fl6, 0, sizeof(*fl6));
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fl6->flowi6_proto = sk->sk_protocol;
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fl6->daddr = sk->sk_v6_daddr;
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fl6->saddr = np->saddr;
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fl6->flowlabel = np->flow_label;
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IP6_ECN_flow_xmit(sk, fl6->flowlabel);
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fl6->flowi6_oif = sk->sk_bound_dev_if;
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fl6->flowi6_mark = sk->sk_mark;
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fl6->fl6_sport = inet->inet_sport;
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fl6->fl6_dport = inet->inet_dport;
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fl6->flowi6_uid = sk->sk_uid;
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security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6));
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rcu_read_lock();
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final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
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rcu_read_unlock();
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dst = __inet6_csk_dst_check(sk, np->dst_cookie);
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if (!dst) {
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dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
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if (!IS_ERR(dst))
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ip6_dst_store(sk, dst, NULL, NULL);
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}
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return dst;
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}
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int inet6_csk_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl_unused)
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{
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct flowi6 fl6;
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struct dst_entry *dst;
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int res;
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dst = inet6_csk_route_socket(sk, &fl6);
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if (IS_ERR(dst)) {
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WRITE_ONCE(sk->sk_err_soft, -PTR_ERR(dst));
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sk->sk_route_caps = 0;
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kfree_skb(skb);
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return PTR_ERR(dst);
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}
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rcu_read_lock();
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skb_dst_set_noref(skb, dst);
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/* Restore final destination back after routing done */
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fl6.daddr = sk->sk_v6_daddr;
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res = ip6_xmit(sk, skb, &fl6, sk->sk_mark, rcu_dereference(np->opt),
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np->tclass, sk->sk_priority);
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rcu_read_unlock();
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return res;
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}
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EXPORT_SYMBOL_GPL(inet6_csk_xmit);
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struct dst_entry *inet6_csk_update_pmtu(struct sock *sk, u32 mtu)
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{
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struct flowi6 fl6;
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struct dst_entry *dst = inet6_csk_route_socket(sk, &fl6);
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if (IS_ERR(dst))
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return NULL;
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dst->ops->update_pmtu(dst, sk, NULL, mtu, true);
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dst = inet6_csk_route_socket(sk, &fl6);
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return IS_ERR(dst) ? NULL : dst;
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}
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EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu);
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