Hi,
So, while playing with IPPROTO_ICMP[1], I rediscovered the sysctl
needed to use it, and went to make sure that it was covered in the
man-pages. It is, in man.7 (ping_group_range), though there is no
mention of IPPROTO_ICMP there. Also, it seems that socket.2 says to
either look at protocols.5 (which just talks about the file) or ip.7
for AF_INET. ip.7 says:
udp_socket = socket(AF_INET, SOCK_DGRAM, 0);
And continues to make assumptions that IPPROTO_ICMP doesn't exist:
"SOCK_DGRAM to open a udp(7) socket", "The only valid values for
protocol are ... 0 and IPPROTO_UDP", etc. Additionally, EACCESS is
missing the error condition for not having ping_group_range set
correctly.
Does it make sense to put IPPROTO_ICMP details in ip.7? Or is there a
better place to list it? Are there additional details beyond what I
pointed out that should be updated in ip.7?
Thanks!
-Kees
[1] https://lwn.net/Articles/443051/
--
Kees Cook
Nexus Security
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