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/*
* netconf_netlink.c - netconf interaction with the kernel using
* netlink
* Copyright (C) 2021 Nvidia, Inc.
* Donald Sharp
*
* This file is part of FRR.
*
* FRR is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* FRR is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with FRR; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#ifdef HAVE_NETLINK /* Netlink OSes only */
#include <ns.h>
#include "linux/netconf.h"
#include "zebra/zebra_ns.h"
#include "zebra/zebra_dplane.h"
#include "zebra/kernel_netlink.h"
#include "zebra/netconf_netlink.h"
#include "zebra/debug.h"
static struct rtattr *netconf_rta(struct netconfmsg *ncm)
{
return (struct rtattr *)((char *)ncm
+ NLMSG_ALIGN(sizeof(struct netconfmsg)));
}
int netlink_netconf_change(struct nlmsghdr *h, ns_id_t ns_id, int startup)
{
struct netconfmsg *ncm;
struct rtattr *tb[NETCONFA_MAX + 1] = {};
int len;
ifindex_t ifindex;
bool mpls_on = false;
bool mc_on = false;
if (h->nlmsg_type != RTM_NEWNETCONF && h->nlmsg_type != RTM_DELNETCONF)
return 0;
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct netconfmsg));
if (len < 0) {
zlog_err("%s: Message received from netlink is of a broken size: %d %zu",
__func__, h->nlmsg_len,
(size_t)NLMSG_LENGTH(sizeof(struct netconfmsg)));
return -1;
}
ncm = NLMSG_DATA(h);
netlink_parse_rtattr(tb, NETCONFA_MAX, netconf_rta(ncm), len);
if (!tb[NETCONFA_IFINDEX]) {
zlog_err("%s: Message received from netlink that we expected to receive an interface on",
__func__);
return 0;
}
ifindex = *(ifindex_t *)RTA_DATA(tb[NETCONFA_IFINDEX]);
switch (ifindex) {
case NETCONFA_IFINDEX_ALL:
case NETCONFA_IFINDEX_DEFAULT:
/*
* We need the ability to handle netlink messages intended
* for all and default interfaces. I am not 100% sure
* what that is yet, or where we would store it.
*/
return 0;
default:
break;
}
if (tb[NETCONFA_INPUT]) {
mpls_on = *(bool *)RTA_DATA(tb[NETCONFA_INPUT]);
/* Create a context and pass it up for processing */
}
if (tb[NETCONFA_MC_FORWARDING]) {
mc_on = *(bool *)RTA_DATA(tb[NETCONFA_MC_FORWARDING]);
/* Create a context and pass it up for processing */
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Interface %u is mpls on: %d multicast on: %d",
ifindex, mpls_on, mc_on);
return 0;
}
static int netlink_request_netconf(struct nlsock *netlink_cmd)
{
struct {
struct nlmsghdr n;
struct netconfmsg ncm;
char buf[1024];
} req;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct netconfmsg));
req.n.nlmsg_flags = NLM_F_DUMP | NLM_F_REQUEST;
req.n.nlmsg_type = RTM_GETNETCONF;
req.ncm.ncm_family = AF_UNSPEC;
return netlink_request(netlink_cmd, &req);
}
int netconf_lookup_netlink(struct zebra_ns *zns)
{
int ret;
struct zebra_dplane_info dp_info;
struct nlsock *netlink_cmd = &zns->netlink_cmd;
zebra_dplane_info_from_zns(&dp_info, zns, true);
ret = netlink_request_netconf(netlink_cmd);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_netconf_change, netlink_cmd, &dp_info,
0, 1);
return ret;
}
#endif /* HAVE_NETLINK */
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