Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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);