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-rw-r--r--nhrpd/netlink_arp.c202
1 files changed, 202 insertions, 0 deletions
diff --git a/nhrpd/netlink_arp.c b/nhrpd/netlink_arp.c
new file mode 100644
index 0000000..cd7fb7a
--- /dev/null
+++ b/nhrpd/netlink_arp.c
@@ -0,0 +1,202 @@
+/* NHRP netlink/neighbor table arpd code
+ * Copyright (c) 2014-2016 Timo Teräs
+ *
+ * This file is free software: you may copy, redistribute and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.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 "thread.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 thread *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 thread *t)
+{
+ uint8_t buf[ZNL_BUFFER_SIZE];
+ int fd = THREAD_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;
+ }
+ }
+ }
+
+ thread_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) {
+ thread_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);
+ thread_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_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_NHRP_NEIGH_GET)
+ ? "who-has"
+ : (cmd == ZEBRA_NHRP_NEIGH_ADDED) ? "new-neigh"
+ : "del-neigh",
+ &addr, ifp->name, &lladdr, ndm_state, c->used, c->cur.type);
+ if (cmd == ZEBRA_NHRP_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);
+ /* In case of shortcuts, nbma is given by lladdr, not
+ * vc->remote.nbma.
+ */
+ netlink_update_binding(ifp, &addr, &lladdr);
+ }
+ } else {
+ state = (cmd == ZEBRA_NHRP_NEIGH_ADDED) ? ndm_state
+ : ZEBRA_NEIGH_STATE_FAILED;
+ nhrp_cache_set_used(c, state == ZEBRA_NEIGH_STATE_REACHABLE);
+ }
+ return 0;
+}