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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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17
src/ipset.c
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@@ -22,9 +22,7 @@
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/utsname.h>
#include <arpa/inet.h>
#include <linux/version.h>
#include <linux/netlink.h>
/* We want to be able to compile against old header files
@@ -87,20 +85,7 @@ static inline void add_attr(struct nlmsghdr *nlh, uint16_t type, size_t len, con
void ipset_init(void)
{
struct utsname utsname;
int version;
char *split;
if (uname(&utsname) < 0)
die(_("failed to find kernel version: %s"), NULL, EC_MISC);
split = strtok(utsname.release, ".");
version = (split ? atoi(split) : 0);
split = strtok(NULL, ".");
version = version * 256 + (split ? atoi(split) : 0);
split = strtok(NULL, ".");
version = version * 256 + (split ? atoi(split) : 0);
old_kernel = (version < KERNEL_VERSION(2,6,32));
old_kernel = (daemon->kernel_version < KERNEL_VERSION(2,6,32));
if (old_kernel && (ipset_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) != -1)
return;