[PATCH 21/24] man/man7/unix.7: Abstract sockets are scoped to a network namespace

["Günther Noack" <gnoack3000@gmail.com>]

Point out that abstract Unix Domain Sockets are visible within the
current network namespace.

Abstract addresses are looked up in the per-network-namespace hash table
(unix_find_abstract() -> unix_find_socket_byname(net, ...) in linux.git
net/unix/af_unix.c), as network_namespaces(7) already mentions.

Assisted-by: LLM
Signed-off-by: Günther Noack <gnoack3000@gmail.com>
---

Notes:
    Verified in code

 man/man7/unix.7 | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/man/man7/unix.7 b/man/man7/unix.7
index 47f09f16d024..8d1a53948f5b 100644
--- a/man/man7/unix.7
+++ b/man/man7/unix.7
@@ -262,6 +262,16 @@ has no effect on the accessibility of the socket.
 Abstract sockets automatically disappear when all open references
 to the socket are closed.
 .P
+Each network namespace has its own abstract socket namespace (see
+.BR network_namespaces (7)):
+a socket can connect or send to an abstract address
+only if the socket bound to that address
+is in the same network namespace.
+In contrast,
+pathname sockets are not confined to a network namespace;
+they can be reached from any network namespace
+in which the socket file is accessible.
+.P
 The abstract socket namespace is a nonportable Linux extension.
 .\"
 .SS Socket options
-- 
2.56.0