diff options
Diffstat (limited to 'net/ipv6/inet6_connection_sock.c')
| -rw-r--r-- | net/ipv6/inet6_connection_sock.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/net/ipv6/inet6_connection_sock.c b/net/ipv6/inet6_connection_sock.c new file mode 100644 index 000000000..5a9f4d722 --- /dev/null +++ b/net/ipv6/inet6_connection_sock.c @@ -0,0 +1,154 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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 + */ + +#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> +#include <net/sock_reuseport.h> + +struct dst_entry *inet6_csk_route_req(const struct sock *sk, + struct flowi6 *fl6, + const struct request_sock *req, + u8 proto) +{ + struct inet_request_sock *ireq = inet_rsk(req); + const 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 = proto; + fl6->daddr = ireq->ir_v6_rmt_addr; + rcu_read_lock(); + final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); + rcu_read_unlock(); + 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); + fl6->flowi6_uid = sk->sk_uid; + security_req_classify_flow(req, flowi6_to_flowi_common(fl6)); + + dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); + if (IS_ERR(dst)) + return NULL; + + return dst; +} +EXPORT_SYMBOL(inet6_csk_route_req); + +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 +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; + fl6->flowi6_uid = sk->sk_uid; + security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); + + rcu_read_lock(); + final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); + rcu_read_unlock(); + + dst = __inet6_csk_dst_check(sk, np->dst_cookie); + if (!dst) { + dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p); + + if (!IS_ERR(dst)) + ip6_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, sk->sk_mark, rcu_dereference(np->opt), + np->tclass, sk->sk_priority); + 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, true); + + dst = inet6_csk_route_socket(sk, &fl6); + return IS_ERR(dst) ? NULL : dst; +} +EXPORT_SYMBOL_GPL(inet6_csk_update_pmtu); |