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Handle old kernels that don't do NETLINK_NO_ENOBUFS.

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Deal with both old kernel header files that don't define it,
and old kernels that don't implement it.

Also generalise Linux kernel version handling.
This commit is contained in:
Simon Kelley
2020-03-19 21:56:45 +00:00
parent e7ee1aa093
commit 0506a5ed4e
5 changed files with 40 additions and 20 deletions
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8
src/netlink.c
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@@ -27,6 +27,9 @@
#define SOL_NETLINK 270
#endif
#ifndef NETLINK_NO_ENOBUFS
#define NETLINK_NO_ENOBUFS 5
#endif
/* linux 2.6.19 buggers up the headers, patch it up here. */
#ifndef IFA_RTA
@@ -79,10 +82,11 @@ void netlink_init(void)
}
if (daemon->netlinkfd == -1 ||
setsockopt(daemon->netlinkfd, SOL_NETLINK, NETLINK_NO_ENOBUFS, &opt, sizeof(opt)) == -1 ||
(daemon->kernel_version >= KERNEL_VERSION(2,6,30) &&
setsockopt(daemon->netlinkfd, SOL_NETLINK, NETLINK_NO_ENOBUFS, &opt, sizeof(opt)) == -1) ||
getsockname(daemon->netlinkfd, (struct sockaddr *)&addr, &slen) == -1)
die(_("cannot create netlink socket: %s"), NULL, EC_MISC);
/* save pid assigned by bind() and retrieved by getsockname() */
netlink_pid = addr.nl_pid;