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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /net/ipv6/inet6_connection_sock.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'net/ipv6/inet6_connection_sock.c')
-rw-r--r--net/ipv6/inet6_connection_sock.c154
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);