/* SPDX-License-Identifier: GPL-2.0 */

/*

 * Get/set/delete fdb table with netlink

 *

 * TODO: merge/replace this with ip neighbour

 *

 * Authors:	Stephen Hemminger <shemminger@vyatta.com>

 */

#include <stdio.h>

#include <stdlib.h>

#include <unistd.h>

#include <netdb.h>

#include <time.h>

#include <fcntl.h>

#include <sys/socket.h>

#include <sys/time.h>

#include <net/if.h>

#include <netinet/in.h>

#include <linux/if_bridge.h>

#include <linux/if_ether.h>

#include <linux/neighbour.h>

#include <string.h>

#include <limits.h>

#include <stdbool.h>

#include "json_print.h"

#include "libnetlink.h"

#include "br_common.h"

#include "rt_names.h"

#include "utils.h"

static unsigned int filter_index, filter_vlan, filter_state, filter_master;

static void usage(void)

{

	fprintf(stderr,

		"Usage: bridge fdb { add | append | del | replace } ADDR dev DEV\n"

		"              [ self ] [ master ] [ use ] [ router ] [ extern_learn ]\n"

		"              [ sticky ] [ local | static | dynamic ] [ dst IPADDR ]\n"

		"              [ vlan VID ] [ port PORT] [ vni VNI ] [ via DEV ]\n"

		"              [ src_vni VNI ]\n"

		"       bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ] [ state STATE ] ]\n");

	exit(-1);

}

static const char *state_n2a(unsigned int s)

{

	static char buf[32];

	if (s & NUD_PERMANENT)

		return "permanent";

	if (s & NUD_NOARP)

		return "static";

	if (s & NUD_STALE)

		return "stale";

	if (s & NUD_REACHABLE)

		return "";

	sprintf(buf, "state=%#x", s);

	return buf;

}

static int state_a2n(unsigned int *s, const char *arg)

{

	if (matches(arg, "permanent") == 0)

		*s = NUD_PERMANENT;

	else if (matches(arg, "static") == 0 || matches(arg, "temp") == 0)

		*s = NUD_NOARP;

	else if (matches(arg, "stale") == 0)

		*s = NUD_STALE;

	else if (matches(arg, "reachable") == 0 || matches(arg, "dynamic") == 0)

		*s = NUD_REACHABLE;

	else if (strcmp(arg, "all") == 0)

		*s = ~0;

	else if (get_unsigned(s, arg, 0))

		return -1;

	return 0;

}

static void fdb_print_flags(FILE *fp, unsigned int flags)

{

	open_json_array(PRINT_JSON,

			is_json_context() ?  "flags" : "");

	if (flags & NTF_SELF)

		print_string(PRINT_ANY, NULL, "%s ", "self");

	if (flags & NTF_ROUTER)

		print_string(PRINT_ANY, NULL, "%s ", "router");

	if (flags & NTF_EXT_LEARNED)

		print_string(PRINT_ANY, NULL, "%s ", "extern_learn");

	if (flags & NTF_OFFLOADED)

		print_string(PRINT_ANY, NULL, "%s ", "offload");

	if (flags & NTF_MASTER)

		print_string(PRINT_ANY, NULL, "%s ", "master");

	if (flags & NTF_STICKY)

		print_string(PRINT_ANY, NULL, "%s ", "sticky");

	close_json_array(PRINT_JSON, NULL);

}

static void fdb_print_stats(FILE *fp, const struct nda_cacheinfo *ci)

{

	static int hz;

	if (!hz)

		hz = get_user_hz();

	if (is_json_context()) {

		print_uint(PRINT_JSON, "used", NULL,

				 ci->ndm_used / hz);

		print_uint(PRINT_JSON, "updated", NULL,

				ci->ndm_updated / hz);

	} else {

		fprintf(fp, "used %d/%d ", ci->ndm_used / hz,

					ci->ndm_updated / hz);

	}

}

int print_fdb(struct nlmsghdr *n, void *arg)

{

	FILE *fp = arg;

	struct ndmsg *r = NLMSG_DATA(n);

	int len = n->nlmsg_len;

	struct rtattr *tb[NDA_MAX+1];

	__u16 vid = 0;

	if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {

		fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",

			n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);

		return 0;

	}

	len -= NLMSG_LENGTH(sizeof(*r));

	if (len < 0) {

		fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);

		return -1;

	}

	if (r->ndm_family != AF_BRIDGE)

		return 0;

	if (filter_index && filter_index != r->ndm_ifindex)

		return 0;

	if (filter_state && !(r->ndm_state & filter_state))

		return 0;

	parse_rtattr(tb, NDA_MAX, NDA_RTA(r),

		     n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));

	if (tb[NDA_VLAN])

		vid = rta_getattr_u16(tb[NDA_VLAN]);

	if (filter_vlan && filter_vlan != vid)

		return 0;

	open_json_object(NULL);

	if (n->nlmsg_type == RTM_DELNEIGH)

		print_bool(PRINT_ANY, "deleted", "Deleted ", true);

	if (tb[NDA_LLADDR]) {

		const char *lladdr;

		SPRINT_BUF(b1);

		lladdr = ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),

				     RTA_PAYLOAD(tb[NDA_LLADDR]),

				     ll_index_to_type(r->ndm_ifindex),

				     b1, sizeof(b1));

		print_color_string(PRINT_ANY, COLOR_MAC,

				   "mac", "%s ", lladdr);

	}

	if (!filter_index && r->ndm_ifindex)

		print_color_string(PRINT_ANY, COLOR_IFNAME,

				   "ifname", "dev %s ",

				   ll_index_to_name(r->ndm_ifindex));

	if (tb[NDA_DST]) {

		int family = AF_INET;

		const char *dst;

		if (RTA_PAYLOAD(tb[NDA_DST]) == sizeof(struct in6_addr))

			family = AF_INET6;

		dst = format_host(family,

				  RTA_PAYLOAD(tb[NDA_DST]),

				  RTA_DATA(tb[NDA_DST]));

		print_color_string(PRINT_ANY,

				   ifa_family_color(family),

				    "dst", "dst %s ", dst);

	}

	if (vid)

		print_uint(PRINT_ANY,

				 "vlan", "vlan %hu ", vid);

	if (tb[NDA_PORT])

		print_uint(PRINT_ANY,

				 "port", "port %u ",

				 rta_getattr_be16(tb[NDA_PORT]));

	if (tb[NDA_VNI])

		print_uint(PRINT_ANY,

				 "vni", "vni %u ",

				 rta_getattr_u32(tb[NDA_VNI]));

	if (tb[NDA_SRC_VNI])

		print_uint(PRINT_ANY,

				 "src_vni", "src_vni %u ",

				rta_getattr_u32(tb[NDA_SRC_VNI]));

	if (tb[NDA_IFINDEX]) {

		unsigned int ifindex = rta_getattr_u32(tb[NDA_IFINDEX]);

		if (tb[NDA_LINK_NETNSID])

			print_uint(PRINT_ANY,

					 "viaIfIndex", "via ifindex %u ",

					 ifindex);

		else

			print_string(PRINT_ANY,

					   "viaIf", "via %s ",

					   ll_index_to_name(ifindex));

	}

	if (tb[NDA_LINK_NETNSID])

		print_uint(PRINT_ANY,

				 "linkNetNsId", "link-netnsid %d ",

				 rta_getattr_u32(tb[NDA_LINK_NETNSID]));

	if (show_stats && tb[NDA_CACHEINFO])

		fdb_print_stats(fp, RTA_DATA(tb[NDA_CACHEINFO]));

	fdb_print_flags(fp, r->ndm_flags);

	if (tb[NDA_MASTER])

		print_string(PRINT_ANY, "master", "master %s ",

			     ll_index_to_name(rta_getattr_u32(tb[NDA_MASTER])));

	print_string(PRINT_ANY, "state", "%s\n",

			   state_n2a(r->ndm_state));

	close_json_object();

	fflush(fp);

	return 0;

}

static int fdb_linkdump_filter(struct nlmsghdr *nlh, int reqlen)

{

	int err;

	if (filter_index) {

		struct ifinfomsg *ifm = NLMSG_DATA(nlh);

		ifm->ifi_index = filter_index;

	}

	if (filter_master) {

		err = addattr32(nlh, reqlen, IFLA_MASTER, filter_master);

		if (err)

			return err;

	}

	return 0;

}

static int fdb_dump_filter(struct nlmsghdr *nlh, int reqlen)

{

	int err;

	if (filter_index) {

		struct ndmsg *ndm = NLMSG_DATA(nlh);

		ndm->ndm_ifindex = filter_index;

	}

	if (filter_master) {

		err = addattr32(nlh, reqlen, NDA_MASTER, filter_master);

		if (err)

			return err;

	}

	return 0;

}

static int fdb_show(int argc, char **argv)

{

	char *filter_dev = NULL;

	char *br = NULL;

	int rc;

	while (argc > 0) {

		if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {

			NEXT_ARG();

			filter_dev = *argv;

		} else if (strcmp(*argv, "br") == 0) {

			NEXT_ARG();

			br = *argv;

		} else if (strcmp(*argv, "vlan") == 0) {

			NEXT_ARG();

			if (filter_vlan)

				duparg("vlan", *argv);

			filter_vlan = atoi(*argv);

		} else if (strcmp(*argv, "state") == 0) {

			unsigned int state;

			NEXT_ARG();

			if (state_a2n(&state, *argv))

				invarg("invalid state", *argv);

			filter_state |= state;

		} else {

			if (matches(*argv, "help") == 0)

				usage();

		}

		argc--; argv++;

	}

	if (br) {

		int br_ifindex = ll_name_to_index(br);

		if (br_ifindex == 0) {

			fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);

			return -1;

		}

		filter_master = br_ifindex;

	}

	/*we'll keep around filter_dev for older kernels */

	if (filter_dev) {

		filter_index = ll_name_to_index(filter_dev);

		if (!filter_index)

			return nodev(filter_dev);

	}

	if (rth.flags & RTNL_HANDLE_F_STRICT_CHK)

		rc = rtnl_neighdump_req(&rth, PF_BRIDGE, fdb_dump_filter);

	else

		rc = rtnl_fdb_linkdump_req_filter_fn(&rth, fdb_linkdump_filter);

	if (rc < 0) {

		perror("Cannot send dump request");

		exit(1);

	}

	new_json_obj(json);

	if (rtnl_dump_filter(&rth, print_fdb, stdout) < 0) {

		fprintf(stderr, "Dump terminated\n");

		exit(1);

	}

	delete_json_obj();

	fflush(stdout);

	return 0;

}

static int fdb_modify(int cmd, int flags, int argc, char **argv)

{

	struct {

		struct nlmsghdr	n;

		struct ndmsg		ndm;

		char			buf[256];

	} req = {

		.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),

		.n.nlmsg_flags = NLM_F_REQUEST | flags,

		.n.nlmsg_type = cmd,

		.ndm.ndm_family = PF_BRIDGE,

		.ndm.ndm_state = NUD_NOARP,

	};

	char *addr = NULL;

	char *d = NULL;

	char abuf[ETH_ALEN];

	int dst_ok = 0;

	inet_prefix dst;

	unsigned long port = 0;

	unsigned long vni = ~0;

	unsigned long src_vni = ~0;

	unsigned int via = 0;

	char *endptr;

	short vid = -1;

	while (argc > 0) {

		if (strcmp(*argv, "dev") == 0) {

			NEXT_ARG();

			d = *argv;

		} else if (strcmp(*argv, "dst") == 0) {

			NEXT_ARG();

			if (dst_ok)

				duparg2("dst", *argv);

			get_addr(&dst, *argv, preferred_family);

			dst_ok = 1;

		} else if (strcmp(*argv, "port") == 0) {

			NEXT_ARG();

			port = strtoul(*argv, &endptr, 0);

			if (endptr && *endptr) {

				struct servent *pse;

				pse = getservbyname(*argv, "udp");

				if (!pse)

					invarg("invalid port\n", *argv);

				port = ntohs(pse->s_port);

			} else if (port > 0xffff)

				invarg("invalid port\n", *argv);

		} else if (strcmp(*argv, "vni") == 0) {

			NEXT_ARG();

			vni = strtoul(*argv, &endptr, 0);

			if ((endptr && *endptr) ||

			    (vni >> 24) || vni == ULONG_MAX)

				invarg("invalid VNI\n", *argv);

		} else if (strcmp(*argv, "src_vni") == 0) {

			NEXT_ARG();

			src_vni = strtoul(*argv, &endptr, 0);

			if ((endptr && *endptr) ||

			    (src_vni >> 24) || src_vni == ULONG_MAX)

				invarg("invalid src VNI\n", *argv);

		} else if (strcmp(*argv, "via") == 0) {

			NEXT_ARG();

			via = ll_name_to_index(*argv);

			if (!via)

				exit(nodev(*argv));

		} else if (strcmp(*argv, "self") == 0) {

			req.ndm.ndm_flags |= NTF_SELF;

		} else if (matches(*argv, "master") == 0) {

			req.ndm.ndm_flags |= NTF_MASTER;

		} else if (matches(*argv, "router") == 0) {

			req.ndm.ndm_flags |= NTF_ROUTER;

		} else if (matches(*argv, "local") == 0 ||

			   matches(*argv, "permanent") == 0) {

			req.ndm.ndm_state |= NUD_PERMANENT;

		} else if (matches(*argv, "temp") == 0 ||

			   matches(*argv, "static") == 0) {

			req.ndm.ndm_state |= NUD_REACHABLE;

		} else if (matches(*argv, "dynamic") == 0) {

			req.ndm.ndm_state |= NUD_REACHABLE;

			req.ndm.ndm_state &= ~NUD_NOARP;

		} else if (matches(*argv, "vlan") == 0) {

			if (vid >= 0)

				duparg2("vlan", *argv);

			NEXT_ARG();

			vid = atoi(*argv);

		} else if (matches(*argv, "use") == 0) {

			req.ndm.ndm_flags |= NTF_USE;

		} else if (matches(*argv, "extern_learn") == 0) {

			req.ndm.ndm_flags |= NTF_EXT_LEARNED;

		} else if (matches(*argv, "sticky") == 0) {

			req.ndm.ndm_flags |= NTF_STICKY;

		} else {

			if (strcmp(*argv, "to") == 0)

				NEXT_ARG();

			if (matches(*argv, "help") == 0)

				usage();

			if (addr)

				duparg2("to", *argv);

			addr = *argv;

		}

		argc--; argv++;

	}

	if (d == NULL || addr == NULL) {

		fprintf(stderr, "Device and address are required arguments.\n");

		return -1;

	}

	/* Assume self */

	if (!(req.ndm.ndm_flags&(NTF_SELF|NTF_MASTER)))

		req.ndm.ndm_flags |= NTF_SELF;

	/* Assume permanent */

	if (!(req.ndm.ndm_state&(NUD_PERMANENT|NUD_REACHABLE)))

		req.ndm.ndm_state |= NUD_PERMANENT;

	if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",

		   abuf, abuf+1, abuf+2,

		   abuf+3, abuf+4, abuf+5) != 6) {

		fprintf(stderr, "Invalid mac address %s\n", addr);

		return -1;

	}

	addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);

	if (dst_ok)

		addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen);

	if (vid >= 0)

		addattr16(&req.n, sizeof(req), NDA_VLAN, vid);

	if (port) {

		unsigned short dport;

		dport = htons((unsigned short)port);

		addattr16(&req.n, sizeof(req), NDA_PORT, dport);

	}

	if (vni != ~0)

		addattr32(&req.n, sizeof(req), NDA_VNI, vni);

	if (src_vni != ~0)

		addattr32(&req.n, sizeof(req), NDA_SRC_VNI, src_vni);

	if (via)

		addattr32(&req.n, sizeof(req), NDA_IFINDEX, via);

	req.ndm.ndm_ifindex = ll_name_to_index(d);

	if (!req.ndm.ndm_ifindex)

		return nodev(d);

	if (rtnl_talk(&rth, &req.n, NULL) < 0)

		return -1;

	return 0;

}

int do_fdb(int argc, char **argv)

{

	ll_init_map(&rth);

	if (argc > 0) {

		if (matches(*argv, "add") == 0)

			return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);

		if (matches(*argv, "append") == 0)

			return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_APPEND, argc-1, argv+1);

		if (matches(*argv, "replace") == 0)

			return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);

		if (matches(*argv, "delete") == 0)

			return fdb_modify(RTM_DELNEIGH, 0, argc-1, argv+1);

		if (matches(*argv, "show") == 0 ||

		    matches(*argv, "lst") == 0 ||

		    matches(*argv, "list") == 0)

			return fdb_show(argc-1, argv+1);

		if (matches(*argv, "help") == 0)

			usage();

	} else

		return fdb_show(0, NULL);

	fprintf(stderr, "Command \"%s\" is unknown, try \"bridge fdb help\".\n", *argv);

	exit(-1);

}