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// SPDX-License-Identifier: GPL-2.0-or-later
/* NHRP netlink/neighbor table arpd code
* Copyright (c) 2014-2016 Timo Teräs
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef GNU_LINUX
#include <linux/rtnetlink.h>
#endif
#include <fcntl.h>
#include <net/if.h>
#include <netinet/if_ether.h>
#include <linux/netlink.h>
#include <linux/neighbour.h>
#include <linux/netfilter/nfnetlink_log.h>
#include "frrevent.h"
#include "stream.h"
#include "prefix.h"
#include "nhrpd.h"
#include "netlink.h"
#include "znl.h"
int netlink_nflog_group;
static int netlink_log_fd = -1;
static struct event *netlink_log_thread;
void netlink_update_binding(struct interface *ifp, union sockunion *proto,
union sockunion *nbma)
{
nhrp_send_zebra_nbr(proto, nbma, ifp);
}
static void netlink_log_register(int fd, int group)
{
struct nlmsghdr *n;
struct nfgenmsg *nf;
struct nfulnl_msg_config_cmd cmd;
struct zbuf *zb = zbuf_alloc(512);
n = znl_nlmsg_push(zb, (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_CONFIG,
NLM_F_REQUEST | NLM_F_ACK);
nf = znl_push(zb, sizeof(*nf));
*nf = (struct nfgenmsg){
.nfgen_family = AF_UNSPEC,
.version = NFNETLINK_V0,
.res_id = htons(group),
};
cmd.command = NFULNL_CFG_CMD_BIND;
znl_rta_push(zb, NFULA_CFG_CMD, &cmd, sizeof(cmd));
znl_nlmsg_complete(zb, n);
zbuf_send(zb, fd);
zbuf_free(zb);
}
static void netlink_log_indication(struct nlmsghdr *msg, struct zbuf *zb)
{
struct nfgenmsg *nf;
struct rtattr *rta;
struct zbuf rtapl, pktpl;
struct interface *ifp;
struct nfulnl_msg_packet_hdr *pkthdr = NULL;
uint32_t *in_ndx = NULL;
nf = znl_pull(zb, sizeof(*nf));
if (!nf)
return;
memset(&pktpl, 0, sizeof(pktpl));
while ((rta = znl_rta_pull(zb, &rtapl)) != NULL) {
switch (rta->rta_type) {
case NFULA_PACKET_HDR:
pkthdr = znl_pull(&rtapl, sizeof(*pkthdr));
break;
case NFULA_IFINDEX_INDEV:
in_ndx = znl_pull(&rtapl, sizeof(*in_ndx));
break;
case NFULA_PAYLOAD:
pktpl = rtapl;
break;
/* NFULA_HWHDR exists and is supposed to contain source
* hardware address. However, for ip_gre it seems to be
* the nexthop destination address if the packet matches
* route. */
}
}
if (!pkthdr || !in_ndx || !zbuf_used(&pktpl))
return;
ifp = if_lookup_by_index(htonl(*in_ndx), VRF_DEFAULT);
if (!ifp)
return;
nhrp_peer_send_indication(ifp, htons(pkthdr->hw_protocol), &pktpl);
}
static void netlink_log_recv(struct event *t)
{
uint8_t buf[ZNL_BUFFER_SIZE];
int fd = EVENT_FD(t);
struct zbuf payload, zb;
struct nlmsghdr *n;
zbuf_init(&zb, buf, sizeof(buf), 0);
while (zbuf_recv(&zb, fd) > 0) {
while ((n = znl_nlmsg_pull(&zb, &payload)) != NULL) {
debugf(NHRP_DEBUG_KERNEL,
"Netlink-log: Received msg_type %u, msg_flags %u",
n->nlmsg_type, n->nlmsg_flags);
switch (n->nlmsg_type) {
case (NFNL_SUBSYS_ULOG << 8) | NFULNL_MSG_PACKET:
netlink_log_indication(n, &payload);
break;
}
}
}
event_add_read(master, netlink_log_recv, 0, netlink_log_fd,
&netlink_log_thread);
}
void netlink_set_nflog_group(int nlgroup)
{
if (netlink_log_fd >= 0) {
event_cancel(&netlink_log_thread);
close(netlink_log_fd);
netlink_log_fd = -1;
}
netlink_nflog_group = nlgroup;
if (nlgroup) {
netlink_log_fd = znl_open(NETLINK_NETFILTER, 0);
if (netlink_log_fd < 0)
return;
netlink_log_register(netlink_log_fd, nlgroup);
event_add_read(master, netlink_log_recv, 0, netlink_log_fd,
&netlink_log_thread);
}
}
int nhrp_neighbor_operation(ZAPI_CALLBACK_ARGS)
{
union sockunion addr = {}, lladdr = {};
struct interface *ifp;
int state, ndm_state;
struct nhrp_cache *c;
struct zapi_neigh_ip api = {};
zclient_neigh_ip_decode(zclient->ibuf, &api);
if (api.ip_len != IPV4_MAX_BYTELEN && api.ip_len != 0)
return 0;
if (api.ip_in.ipa_type == AF_UNSPEC)
return 0;
sockunion_family(&addr) = api.ip_in.ipa_type;
memcpy((uint8_t *)sockunion_get_addr(&addr), &api.ip_in.ip.addr,
family2addrsize(api.ip_in.ipa_type));
sockunion_family(&lladdr) = api.ip_out.ipa_type;
if (api.ip_out.ipa_type != AF_UNSPEC)
memcpy((uint8_t *)sockunion_get_addr(&lladdr),
&api.ip_out.ip.addr,
family2addrsize(api.ip_out.ipa_type));
ifp = if_lookup_by_index(api.index, vrf_id);
ndm_state = api.ndm_state;
if (!ifp)
return 0;
c = nhrp_cache_get(ifp, &addr, 0);
if (!c)
return 0;
debugf(NHRP_DEBUG_KERNEL,
"Netlink: %s %pSU dev %s lladdr %pSU nud 0x%x cache used %u type %u",
(cmd == ZEBRA_NEIGH_GET) ? "who-has"
: (cmd == ZEBRA_NEIGH_ADDED) ? "new-neigh"
: "del-neigh",
&addr, ifp->name, &lladdr, ndm_state, c->used, c->cur.type);
if (cmd == ZEBRA_NEIGH_GET) {
if (c->cur.type >= NHRP_CACHE_CACHED) {
nhrp_cache_set_used(c, 1);
debugf(NHRP_DEBUG_KERNEL,
"Netlink: update binding for %pSU dev %s from c %pSU peer.vc.nbma %pSU to lladdr %pSU",
&addr, ifp->name, &c->cur.remote_nbma_natoa,
&c->cur.peer->vc->remote.nbma, &lladdr);
if (lladdr.sa.sa_family == AF_UNSPEC)
/* nothing from zebra, so use nhrp peer */
lladdr = c->cur.peer->vc->remote.nbma;
/* In case of shortcuts, nbma is given by lladdr, not
* vc->remote.nbma.
*/
netlink_update_binding(ifp, &addr, &lladdr);
}
} else {
state = (cmd == ZEBRA_NEIGH_ADDED) ? ndm_state
: ZEBRA_NEIGH_STATE_FAILED;
nhrp_cache_set_used(c, state == ZEBRA_NEIGH_STATE_REACHABLE);
}
return 0;
}
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