linux-kernel - [PATCH] ip.7: Add not supported by SOCK

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Message-ID: <hxiq3upwxs3j5mc5arwlx4jriqm7fq5z54wroc4h4kqcq4gq7m@uwnoq2vnkhup>
Date: Sat, 2 Mar 2024 13:19:42 -0500
From: Oliver Crumrine <ozlinuxc@...il.com>
To: alx@...nel.org
Cc: linux-kernel@...r.kernel.org, linux-man@...r.kernel.org, 
	netdev@...r.kernel.org
Subject: [PATCH] ip.7: Add not supported by SOCK_STREAM to socket options

It was not made clear in several socket options that they were not
supported by SOCK_STREAM; this patch fixes that.

Socket options not supported by SOCK_STREAM are handled in the
ip_cmsg_recv_offset function in net/ipv4/ip_sockglue.c. The function is
called for udp sockets, and indirectly by ping and raw sockets, but not
for TCP sockets, as they don't support these options.

Signed-off-by: Oliver Crumrine <ozlinuxc@...il.com>
---
 man7/ip.7 | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/man7/ip.7 b/man7/ip.7
index 2b4b06324..104e65feb 100644
--- a/man7/ip.7
+++ b/man7/ip.7
@@ -828,6 +828,9 @@ is not zero, the primary local address of the interface specified by the
 index overwrites
 .I ipi_spec_dst
 for the routing table lookup.
+Not supported for
+.B SOCK_STREAM
+sockets.
 .TP
 .BR IP_RECVERR " (since Linux 2.2)"
 .\" Precisely: since Linux 2.1.15
@@ -989,6 +992,9 @@ in which the kernel returns the original destination address
 of the datagram being received.
 The ancillary message contains a
 .IR "struct sockaddr_in" .
+Not supported for
+.B SOCK_STREAM
+sockets.
 .TP
 .BR IP_RECVTOS " (since Linux 2.2)"
 .\" Precisely: since Linux 2.1.68
@@ -998,6 +1004,9 @@ ancillary message is passed with incoming packets.
 It contains a byte which specifies the Type of Service/Precedence
 field of the packet header.
 Expects a boolean integer flag.
+Not supported for
+.B SOCK_STREAM
+sockets.
 .TP
 .BR IP_RECVTTL " (since Linux 2.2)"
 .\" Precisely: since Linux 2.1.68
-- 
2.44.0