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154 lines
4.2 KiB
154 lines
4.2 KiB
// 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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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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