netdev - [BUG?] ipv6.7: SOCK_DGRAM can accept different protocols?

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Date:   Thu, 16 Sep 2021 19:37:35 +0200
From:   Alejandro Colomar <colomar.6.4.3@...il.com>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>,
        netdev@...r.kernel.org
Cc:     linux-man <linux-man@...r.kernel.org>
Subject: [BUG?] ipv6.7: SOCK_DGRAM can accept different protocols?

Hi,

Reading a stackoverflow question 
<https://stackoverflow.com/questions/51996808/do-we-need-to-specify-protocol-when-type-is-sock-dgram-or-sock-stream-in-soc> 
it noted that, while ip(7) notes that protocol can be left as 0 for both 
SOCK_STREAM and SOCK_DGRAM, ipv6(7) is misleading and seems to suggest 
that protocol may be significant for SOCK_DGRAM (at least in the SYNOPSIS).

I guess that's not true, and it can be left as 0, but since I don't 
know, I'll ask.

Thanks,

Alex


--

IP(7)                Linux Programmer's Manual               IP(7)

NAME
        ip - Linux IPv4 protocol implementation

SYNOPSIS
        #include <sys/socket.h>
        #include <netinet/in.h>
        #include <netinet/ip.h> /* superset of previous */

        tcp_socket = socket(AF_INET, SOCK_STREAM, 0);
        udp_socket = socket(AF_INET, SOCK_DGRAM, 0);
        raw_socket = socket(AF_INET, SOCK_RAW, protocol);


--

IPV6(7)              Linux Programmer's Manual             IPV6(7)

NAME
        ipv6 - Linux IPv6 protocol implementation

SYNOPSIS
        #include <sys/socket.h>
        #include <netinet/in.h>

        tcp6_socket = socket(AF_INET6, SOCK_STREAM, 0);
        raw6_socket = socket(AF_INET6, SOCK_RAW, protocol);
        udp6_socket = socket(AF_INET6, SOCK_DGRAM, protocol);


-- 
Alejandro Colomar
Linux man-pages comaintainer; https://www.kernel.org/doc/man-pages/
http://www.alejandro-colomar.es/