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route: try to autoload netlink(4) module if not present in the kernel.

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Differential Revision: https://reviews.freebsd.org/D39324
This commit is contained in:
Alexander V. Chernikov 2023-03-29 15:31:26 +00:00 committed by Oscar Zhao
parent ffd2a1ec23
commit 53587fff0e
1 changed files with 22 additions and 6 deletions
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28
sbin/route/route_netlink.c
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@ -6,6 +6,8 @@
#include <sys/bitcount.h>
#include <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
@ -90,6 +92,23 @@ get_netmask(struct snl_state *ss, int family, int plen)
return (NULL);
}
static void
nl_init_socket(struct snl_state *ss)
{
if (snl_init(ss, NETLINK_ROUTE))
return;
if (modfind("netlink") == -1 && errno == ENOENT) {
/* Try to load */
if (kldload("netlink") == -1)
err(1, "netlink is not loaded and load attempt failed");
if (snl_init(ss, NETLINK_ROUTE))
return;
}
err(1, "unable to open netlink socket");
}
struct nl_helper {
struct snl_state ss_cmd;
};
@ -97,8 +116,7 @@ struct nl_helper {
static void
nl_helper_init(struct nl_helper *h)
{
if (!snl_init(&h->ss_cmd, NETLINK_ROUTE))
err(1, "unable to open netlink socket");
nl_init_socket(&h->ss_cmd);
}
static void
@ -680,8 +698,7 @@ monitor_nl(int fib)
struct snl_state ss_event = {};
struct nl_helper h;
if (!snl_init(&ss_event, NETLINK_ROUTE))
err(1, "unable to open netlink socket");
nl_init_socket(&ss_event);
nl_helper_init(&h);
int groups[] = {
@ -789,8 +806,7 @@ flushroutes_fib_nl(int fib, int af)
struct snl_writer nw;
struct nl_helper h = {};
if (!snl_init(&ss, NETLINK_ROUTE))
err(1, "unable to open netlink socket");
nl_init_socket(&ss);
snl_init_writer(&ss, &nw);
struct nlmsghdr *hdr = snl_create_msg_request(&nw, NL_RTM_GETROUTE);