[mirror_frr.git] / nhrpd / nhrp_nhs.c

/* NHRP NHC nexthop server functions (registration)
 * Copyright (c) 2014-2015 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.
 */

#include "zebra.h"
#include "zbuf.h"
#include "memory.h"
#include "thread.h"
#include "nhrpd.h"
#include "nhrp_protocol.h"

DEFINE_MTYPE_STATIC(NHRPD, NHRP_NHS, "NHRP next hop server")
DEFINE_MTYPE_STATIC(NHRPD, NHRP_REGISTRATION, "NHRP registration entries")

static int nhrp_nhs_resolve(struct thread *t);
static int nhrp_reg_send_req(struct thread *t);

static void nhrp_reg_reply(struct nhrp_reqid *reqid, void *arg)
{
	struct nhrp_packet_parser *p = arg;
	struct nhrp_registration *r =
		container_of(reqid, struct nhrp_registration, reqid);
	struct nhrp_nhs *nhs = r->nhs;
	struct interface *ifp = nhs->ifp;
	struct nhrp_interface *nifp = ifp->info;
	struct nhrp_extension_header *ext;
	struct nhrp_cie_header *cie;
	struct nhrp_cache *c;
	struct zbuf extpl;
	union sockunion cie_nbma, cie_proto, *proto;
	char buf[64];
	int ok = 0, holdtime;

	nhrp_reqid_free(&nhrp_packet_reqid, &r->reqid);

	if (p->hdr->type != NHRP_PACKET_REGISTRATION_REPLY) {
		debugf(NHRP_DEBUG_COMMON, "NHS: Registration failed");
		return;
	}

	debugf(NHRP_DEBUG_COMMON, "NHS: Reg.reply received");

	ok = 1;
	while ((cie = nhrp_cie_pull(&p->payload, p->hdr, &cie_nbma, &cie_proto))
	       != NULL) {
		proto = sockunion_family(&cie_proto) != AF_UNSPEC
				? &cie_proto
				: &p->src_proto;
		debugf(NHRP_DEBUG_COMMON, "NHS: CIE registration: %s: %d",
		       sockunion2str(proto, buf, sizeof(buf)), cie->code);
		if (!((cie->code == NHRP_CODE_SUCCESS)
		      || (cie->code == NHRP_CODE_ADMINISTRATIVELY_PROHIBITED
			  && nhs->hub)))
			ok = 0;
	}

	if (!ok)
		return;

	/* Parse extensions */
	sockunion_family(&nifp->nat_nbma) = AF_UNSPEC;
	while ((ext = nhrp_ext_pull(&p->extensions, &extpl)) != NULL) {
		switch (htons(ext->type) & ~NHRP_EXTENSION_FLAG_COMPULSORY) {
		case NHRP_EXTENSION_NAT_ADDRESS:
			/* NHS adds second CIE if NAT is detected */
			if (nhrp_cie_pull(&extpl, p->hdr, &cie_nbma, &cie_proto)
			    && nhrp_cie_pull(&extpl, p->hdr, &cie_nbma,
					     &cie_proto)) {
				nifp->nat_nbma = cie_nbma;
				debugf(NHRP_DEBUG_IF,
				       "%s: NAT detected, real NBMA address: %s",
				       ifp->name,
				       sockunion2str(&nifp->nbma, buf,
						     sizeof(buf)));
			}
			break;
		}
	}

	/* Success - schedule next registration, and route NHS */
	r->timeout = 2;
	holdtime = nifp->afi[nhs->afi].holdtime;
	THREAD_OFF(r->t_register);

	/* RFC 2332 5.2.3 - Registration is recommend to be renewed
	 * every one third of holdtime */
	thread_add_timer(master, nhrp_reg_send_req, r, holdtime / 3,
			 &r->t_register);

	r->proto_addr = p->dst_proto;
	c = nhrp_cache_get(ifp, &p->dst_proto, 1);
	if (c)
		nhrp_cache_update_binding(c, NHRP_CACHE_NHS, holdtime,
					  nhrp_peer_ref(r->peer), 0, NULL);
}

static int nhrp_reg_timeout(struct thread *t)
{
	struct nhrp_registration *r = THREAD_ARG(t);
	struct nhrp_cache *c;

	r->t_register = NULL;

	if (r->timeout >= 16 && sockunion_family(&r->proto_addr) != AF_UNSPEC) {
		nhrp_reqid_free(&nhrp_packet_reqid, &r->reqid);
		c = nhrp_cache_get(r->nhs->ifp, &r->proto_addr, 0);
		if (c)
			nhrp_cache_update_binding(c, NHRP_CACHE_NHS, -1, NULL,
						  0, NULL);
		sockunion_family(&r->proto_addr) = AF_UNSPEC;
	}

	r->timeout <<= 1;
	if (r->timeout > 64)
		r->timeout = 2;
	thread_add_timer_msec(master, nhrp_reg_send_req, r, 10, &r->t_register);

	return 0;
}

static void nhrp_reg_peer_notify(struct notifier_block *n, unsigned long cmd)
{
	struct nhrp_registration *r =
		container_of(n, struct nhrp_registration, peer_notifier);
	char buf[SU_ADDRSTRLEN];

	switch (cmd) {
	case NOTIFY_PEER_UP:
	case NOTIFY_PEER_DOWN:
	case NOTIFY_PEER_IFCONFIG_CHANGED:
	case NOTIFY_PEER_MTU_CHANGED:
		debugf(NHRP_DEBUG_COMMON, "NHS: Flush timer for %s",
		       sockunion2str(&r->peer->vc->remote.nbma, buf,
				     sizeof buf));
		THREAD_TIMER_OFF(r->t_register);
		thread_add_timer_msec(master, nhrp_reg_send_req, r, 10,
				      &r->t_register);
		break;
	}
}

static int nhrp_reg_send_req(struct thread *t)
{
	struct nhrp_registration *r = THREAD_ARG(t);
	struct nhrp_nhs *nhs = r->nhs;
	char buf1[SU_ADDRSTRLEN], buf2[SU_ADDRSTRLEN];
	struct interface *ifp = nhs->ifp;
	struct nhrp_interface *nifp = ifp->info;
	struct nhrp_afi_data *if_ad = &nifp->afi[nhs->afi];
	union sockunion *dst_proto;
	struct zbuf *zb;
	struct nhrp_packet_header *hdr;
	struct nhrp_extension_header *ext;
	struct nhrp_cie_header *cie;

	r->t_register = NULL;
	if (!nhrp_peer_check(r->peer, 2)) {
		debugf(NHRP_DEBUG_COMMON, "NHS: Waiting link for %s",
		       sockunion2str(&r->peer->vc->remote.nbma, buf1,
				     sizeof buf1));
		thread_add_timer(master, nhrp_reg_send_req, r, 120,
				 &r->t_register);
		return 0;
	}

	thread_add_timer(master, nhrp_reg_timeout, r, r->timeout,
			 &r->t_register);

	/* RFC2332 5.2.3 NHC uses it's own address as dst if NHS is unknown */
	dst_proto = &nhs->proto_addr;
	if (sockunion_family(dst_proto) == AF_UNSPEC)
		dst_proto = &if_ad->addr;

	sockunion2str(&if_ad->addr, buf1, sizeof(buf1));
	sockunion2str(dst_proto, buf2, sizeof(buf2));
	debugf(NHRP_DEBUG_COMMON, "NHS: Register %s -> %s (timeout %d)", buf1,
	       buf2, r->timeout);

	/* No protocol address configured for tunnel interface */
	if (sockunion_family(&if_ad->addr) == AF_UNSPEC)
		return 0;

	zb = zbuf_alloc(1400);
	hdr = nhrp_packet_push(zb, NHRP_PACKET_REGISTRATION_REQUEST,
			       &nifp->nbma, &if_ad->addr, dst_proto);
	hdr->hop_count = 1;
	if (!(if_ad->flags & NHRP_IFF_REG_NO_UNIQUE))
		hdr->flags |= htons(NHRP_FLAG_REGISTRATION_UNIQUE);

	hdr->u.request_id = htonl(nhrp_reqid_alloc(&nhrp_packet_reqid,
						   &r->reqid, nhrp_reg_reply));

	/* FIXME: push CIE for each local protocol address */
	cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, NULL, NULL);
	cie->prefix_length = 0xff;
	cie->holding_time = htons(if_ad->holdtime);
	cie->mtu = htons(if_ad->mtu);

	nhrp_ext_request(zb, hdr, ifp);

	/* Cisco NAT detection extension */
	hdr->flags |= htons(NHRP_FLAG_REGISTRATION_NAT);
	ext = nhrp_ext_push(zb, hdr, NHRP_EXTENSION_NAT_ADDRESS);
	cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, &nifp->nbma, &if_ad->addr);
	cie->prefix_length = 8 * sockunion_get_addrlen(&if_ad->addr);
	nhrp_ext_complete(zb, ext);

	nhrp_packet_complete(zb, hdr);
	nhrp_peer_send(r->peer, zb);
	zbuf_free(zb);

	return 0;
}

static void nhrp_reg_delete(struct nhrp_registration *r)
{
	nhrp_peer_notify_del(r->peer, &r->peer_notifier);
	nhrp_peer_unref(r->peer);
	list_del(&r->reglist_entry);
	THREAD_OFF(r->t_register);
	XFREE(MTYPE_NHRP_REGISTRATION, r);
}

static struct nhrp_registration *
nhrp_reg_by_nbma(struct nhrp_nhs *nhs, const union sockunion *nbma_addr)
{
	struct nhrp_registration *r;

	list_for_each_entry(
		r, &nhs->reglist_head,
		reglist_entry) if (sockunion_same(&r->peer->vc->remote.nbma,
						  nbma_addr)) return r;
	return NULL;
}

static void nhrp_nhs_resolve_cb(struct resolver_query *q, int n,
				union sockunion *addrs)
{
	struct nhrp_nhs *nhs = container_of(q, struct nhrp_nhs, dns_resolve);
	struct nhrp_interface *nifp = nhs->ifp->info;
	struct nhrp_registration *reg, *regn;
	int i;

	nhs->t_resolve = NULL;
	if (n < 0) {
		/* Failed, retry in a moment */
		thread_add_timer(master, nhrp_nhs_resolve, nhs, 5,
				 &nhs->t_resolve);
		return;
	}

	thread_add_timer(master, nhrp_nhs_resolve, nhs, 2 * 60 * 60,
			 &nhs->t_resolve);

	list_for_each_entry(reg, &nhs->reglist_head, reglist_entry) reg->mark =
		1;

	nhs->hub = 0;
	for (i = 0; i < n; i++) {
		if (sockunion_same(&addrs[i], &nifp->nbma)) {
			nhs->hub = 1;
			continue;
		}

		reg = nhrp_reg_by_nbma(nhs, &addrs[i]);
		if (reg) {
			reg->mark = 0;
			continue;
		}

		reg = XCALLOC(MTYPE_NHRP_REGISTRATION, sizeof(*reg));
		reg->peer = nhrp_peer_get(nhs->ifp, &addrs[i]);
		reg->nhs = nhs;
		reg->timeout = 1;
		list_init(&reg->reglist_entry);
		list_add_tail(&reg->reglist_entry, &nhs->reglist_head);
		nhrp_peer_notify_add(reg->peer, &reg->peer_notifier,
				     nhrp_reg_peer_notify);
		thread_add_timer_msec(master, nhrp_reg_send_req, reg, 50,
				      &reg->t_register);
	}

	list_for_each_entry_safe(reg, regn, &nhs->reglist_head, reglist_entry)
	{
		if (reg->mark)
			nhrp_reg_delete(reg);
	}
}

static int nhrp_nhs_resolve(struct thread *t)
{
	struct nhrp_nhs *nhs = THREAD_ARG(t);

	resolver_resolve(&nhs->dns_resolve, AF_INET, nhs->nbma_fqdn,
			 nhrp_nhs_resolve_cb);

	return 0;
}

int nhrp_nhs_add(struct interface *ifp, afi_t afi, union sockunion *proto_addr,
		 const char *nbma_fqdn)
{
	struct nhrp_interface *nifp = ifp->info;
	struct nhrp_nhs *nhs;

	if (sockunion_family(proto_addr) != AF_UNSPEC
	    && sockunion_family(proto_addr) != afi2family(afi))
		return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH;

	list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry)
	{
		if (sockunion_family(&nhs->proto_addr) != AF_UNSPEC
		    && sockunion_family(proto_addr) != AF_UNSPEC
		    && sockunion_same(&nhs->proto_addr, proto_addr))
			return NHRP_ERR_ENTRY_EXISTS;

		if (strcmp(nhs->nbma_fqdn, nbma_fqdn) == 0)
			return NHRP_ERR_ENTRY_EXISTS;
	}

	nhs = XMALLOC(MTYPE_NHRP_NHS, sizeof(struct nhrp_nhs));

	*nhs = (struct nhrp_nhs){
		.afi = afi,
		.ifp = ifp,
		.proto_addr = *proto_addr,
		.nbma_fqdn = strdup(nbma_fqdn),
		.reglist_head = LIST_INITIALIZER(nhs->reglist_head),
	};
	list_add_tail(&nhs->nhslist_entry, &nifp->afi[afi].nhslist_head);
	thread_add_timer_msec(master, nhrp_nhs_resolve, nhs, 1000,
			      &nhs->t_resolve);

	return NHRP_OK;
}

int nhrp_nhs_del(struct interface *ifp, afi_t afi, union sockunion *proto_addr,
		 const char *nbma_fqdn)
{
	struct nhrp_interface *nifp = ifp->info;
	struct nhrp_nhs *nhs, *nnhs;
	int ret = NHRP_ERR_ENTRY_NOT_FOUND;

	if (sockunion_family(proto_addr) != AF_UNSPEC
	    && sockunion_family(proto_addr) != afi2family(afi))
		return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH;

	list_for_each_entry_safe(nhs, nnhs, &nifp->afi[afi].nhslist_head,
				 nhslist_entry)
	{
		if (!sockunion_same(&nhs->proto_addr, proto_addr))
			continue;
		if (strcmp(nhs->nbma_fqdn, nbma_fqdn) != 0)
			continue;

		nhrp_nhs_free(nhs);
		ret = NHRP_OK;
	}

	return ret;
}

int nhrp_nhs_free(struct nhrp_nhs *nhs)
{
	struct nhrp_registration *r, *rn;

	list_for_each_entry_safe(r, rn, &nhs->reglist_head, reglist_entry)
		nhrp_reg_delete(r);
	THREAD_OFF(nhs->t_resolve);
	list_del(&nhs->nhslist_entry);
	free((void *)nhs->nbma_fqdn);
	XFREE(MTYPE_NHRP_NHS, nhs);
	return 0;
}

void nhrp_nhs_terminate(void)
{
	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
	struct interface *ifp;
	struct nhrp_interface *nifp;
	struct nhrp_nhs *nhs, *tmp;
	afi_t afi;

	FOR_ALL_INTERFACES (vrf, ifp) {
		nifp = ifp->info;
		for (afi = 0; afi < AFI_MAX; afi++) {
			list_for_each_entry_safe(
				nhs, tmp, &nifp->afi[afi].nhslist_head,
				nhslist_entry) nhrp_nhs_free(nhs);
		}
	}
}

void nhrp_nhs_foreach(struct interface *ifp, afi_t afi,
		      void (*cb)(struct nhrp_nhs *, struct nhrp_registration *,
				 void *),
		      void *ctx)
{
	struct nhrp_interface *nifp = ifp->info;
	struct nhrp_nhs *nhs;
	struct nhrp_registration *reg;

	list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry)
	{
		if (!list_empty(&nhs->reglist_head)) {
			list_for_each_entry(reg, &nhs->reglist_head,
					    reglist_entry) cb(nhs, reg, ctx);
		} else
			cb(nhs, 0, ctx);
	}
}
Commit	Line	Data
2fb975da TT	1	/* NHRP NHC nexthop server functions (registration)
	2	* Copyright (c) 2014-2015 Timo Teräs
	3	*
	4	* This file is free software: you may copy, redistribute and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
	8	*/
	9
	10	#include "zebra.h"
	11	#include "zbuf.h"
	12	#include "memory.h"
	13	#include "thread.h"
	14	#include "nhrpd.h"
	15	#include "nhrp_protocol.h"
	16
819dc8bb DL	17	DEFINE_MTYPE_STATIC(NHRPD, NHRP_NHS, "NHRP next hop server")
	18	DEFINE_MTYPE_STATIC(NHRPD, NHRP_REGISTRATION, "NHRP registration entries")
	19
2fb975da	20	static int nhrp_nhs_resolve(struct thread *t);
2fb975da TT	21	static int nhrp_reg_send_req(struct thread *t);
	22
	23	static void nhrp_reg_reply(struct nhrp_reqid reqid, void arg)
	24	{
	25	struct nhrp_packet_parser *p = arg;
996c9314 LB	26	struct nhrp_registration *r =
996c9314 LB	27	container_of(reqid, struct nhrp_registration, reqid);
2fb975da TT	28	struct nhrp_nhs *nhs = r->nhs;
	29	struct interface *ifp = nhs->ifp;
	30	struct nhrp_interface *nifp = ifp->info;
	31	struct nhrp_extension_header *ext;
	32	struct nhrp_cie_header *cie;
	33	struct nhrp_cache *c;
	34	struct zbuf extpl;
	35	union sockunion cie_nbma, cie_proto, *proto;
	36	char buf[64];
	37	int ok = 0, holdtime;
	38
	39	nhrp_reqid_free(&nhrp_packet_reqid, &r->reqid);
	40
	41	if (p->hdr->type != NHRP_PACKET_REGISTRATION_REPLY) {
	42	debugf(NHRP_DEBUG_COMMON, "NHS: Registration failed");
	43	return;
	44	}
	45
	46	debugf(NHRP_DEBUG_COMMON, "NHS: Reg.reply received");
	47
	48	ok = 1;
996c9314 LB	49	while ((cie = nhrp_cie_pull(&p->payload, p->hdr, &cie_nbma, &cie_proto))
	50	!= NULL) {
	51	proto = sockunion_family(&cie_proto) != AF_UNSPEC
	52	? &cie_proto
	53	: &p->src_proto;
2fb975da	54	debugf(NHRP_DEBUG_COMMON, "NHS: CIE registration: %s: %d",
996c9314 LB	55	sockunion2str(proto, buf, sizeof(buf)), cie->code);
	56	if (!((cie->code == NHRP_CODE_SUCCESS)
	57	\|\| (cie->code == NHRP_CODE_ADMINISTRATIVELY_PROHIBITED
	58	&& nhs->hub)))
2fb975da TT	59	ok = 0;
	60	}
	61
	62	if (!ok)
	63	return;
	64
	65	/* Parse extensions */
	66	sockunion_family(&nifp->nat_nbma) = AF_UNSPEC;
	67	while ((ext = nhrp_ext_pull(&p->extensions, &extpl)) != NULL) {
	68	switch (htons(ext->type) & ~NHRP_EXTENSION_FLAG_COMPULSORY) {
	69	case NHRP_EXTENSION_NAT_ADDRESS:
	70	/* NHS adds second CIE if NAT is detected */
996c9314 LB	71	if (nhrp_cie_pull(&extpl, p->hdr, &cie_nbma, &cie_proto)
	72	&& nhrp_cie_pull(&extpl, p->hdr, &cie_nbma,
	73	&cie_proto)) {
2fb975da	74	nifp->nat_nbma = cie_nbma;
996c9314 LB	75	debugf(NHRP_DEBUG_IF,
	76	"%s: NAT detected, real NBMA address: %s",
	77	ifp->name,
	78	sockunion2str(&nifp->nbma, buf,
	79	sizeof(buf)));
2fb975da TT	80	}
	81	break;
	82	}
	83	}
	84
	85	/* Success - schedule next registration, and route NHS */
	86	r->timeout = 2;
	87	holdtime = nifp->afi[nhs->afi].holdtime;
	88	THREAD_OFF(r->t_register);
	89
	90	/* RFC 2332 5.2.3 - Registration is recommend to be renewed
	91	* every one third of holdtime */
ffa2c898 QY	92	thread_add_timer(master, nhrp_reg_send_req, r, holdtime / 3,
ffa2c898 QY	93	&r->t_register);
2fb975da TT	94
	95	r->proto_addr = p->dst_proto;
	96	c = nhrp_cache_get(ifp, &p->dst_proto, 1);
996c9314 LB	97	if (c)
	98	nhrp_cache_update_binding(c, NHRP_CACHE_NHS, holdtime,
	99	nhrp_peer_ref(r->peer), 0, NULL);
2fb975da TT	100	}
	101
	102	static int nhrp_reg_timeout(struct thread *t)
	103	{
	104	struct nhrp_registration *r = THREAD_ARG(t);
	105	struct nhrp_cache *c;
	106
	107	r->t_register = NULL;
	108
	109	if (r->timeout >= 16 && sockunion_family(&r->proto_addr) != AF_UNSPEC) {
	110	nhrp_reqid_free(&nhrp_packet_reqid, &r->reqid);
	111	c = nhrp_cache_get(r->nhs->ifp, &r->proto_addr, 0);
996c9314 LB	112	if (c)
	113	nhrp_cache_update_binding(c, NHRP_CACHE_NHS, -1, NULL,
	114	0, NULL);
2fb975da TT	115	sockunion_family(&r->proto_addr) = AF_UNSPEC;
	116	}
	117
	118	r->timeout <<= 1;
996c9314 LB	119	if (r->timeout > 64)
	120	r->timeout = 2;
	121	thread_add_timer_msec(master, nhrp_reg_send_req, r, 10, &r->t_register);
2fb975da TT	122
	123	return 0;
	124	}
	125
	126	static void nhrp_reg_peer_notify(struct notifier_block *n, unsigned long cmd)
	127	{
996c9314 LB	128	struct nhrp_registration *r =
996c9314 LB	129	container_of(n, struct nhrp_registration, peer_notifier);
2fb975da TT	130	char buf[SU_ADDRSTRLEN];
	131
	132	switch (cmd) {
	133	case NOTIFY_PEER_UP:
	134	case NOTIFY_PEER_DOWN:
	135	case NOTIFY_PEER_IFCONFIG_CHANGED:
	136	case NOTIFY_PEER_MTU_CHANGED:
	137	debugf(NHRP_DEBUG_COMMON, "NHS: Flush timer for %s",
996c9314 LB	138	sockunion2str(&r->peer->vc->remote.nbma, buf,
996c9314 LB	139	sizeof buf));
2fb975da	140	THREAD_TIMER_OFF(r->t_register);
ffa2c898 QY	141	thread_add_timer_msec(master, nhrp_reg_send_req, r, 10,
ffa2c898 QY	142	&r->t_register);
2fb975da TT	143	break;
	144	}
	145	}
	146
	147	static int nhrp_reg_send_req(struct thread *t)
	148	{
	149	struct nhrp_registration *r = THREAD_ARG(t);
	150	struct nhrp_nhs *nhs = r->nhs;
	151	char buf1[SU_ADDRSTRLEN], buf2[SU_ADDRSTRLEN];
	152	struct interface *ifp = nhs->ifp;
	153	struct nhrp_interface *nifp = ifp->info;
	154	struct nhrp_afi_data *if_ad = &nifp->afi[nhs->afi];
	155	union sockunion *dst_proto;
	156	struct zbuf *zb;
	157	struct nhrp_packet_header *hdr;
	158	struct nhrp_extension_header *ext;
	159	struct nhrp_cie_header *cie;
	160
	161	r->t_register = NULL;
	162	if (!nhrp_peer_check(r->peer, 2)) {
	163	debugf(NHRP_DEBUG_COMMON, "NHS: Waiting link for %s",
996c9314 LB	164	sockunion2str(&r->peer->vc->remote.nbma, buf1,
996c9314 LB	165	sizeof buf1));
ffa2c898 QY	166	thread_add_timer(master, nhrp_reg_send_req, r, 120,
ffa2c898 QY	167	&r->t_register);
2fb975da TT	168	return 0;
	169	}
	170
ffa2c898 QY	171	thread_add_timer(master, nhrp_reg_timeout, r, r->timeout,
ffa2c898 QY	172	&r->t_register);
2fb975da TT	173
	174	/* RFC2332 5.2.3 NHC uses it's own address as dst if NHS is unknown */
	175	dst_proto = &nhs->proto_addr;
	176	if (sockunion_family(dst_proto) == AF_UNSPEC)
	177	dst_proto = &if_ad->addr;
	178
	179	sockunion2str(&if_ad->addr, buf1, sizeof(buf1));
	180	sockunion2str(dst_proto, buf2, sizeof(buf2));
996c9314 LB	181	debugf(NHRP_DEBUG_COMMON, "NHS: Register %s -> %s (timeout %d)", buf1,
996c9314 LB	182	buf2, r->timeout);
2fb975da TT	183
	184	/* No protocol address configured for tunnel interface */
	185	if (sockunion_family(&if_ad->addr) == AF_UNSPEC)
	186	return 0;
	187
	188	zb = zbuf_alloc(1400);
996c9314 LB	189	hdr = nhrp_packet_push(zb, NHRP_PACKET_REGISTRATION_REQUEST,
996c9314 LB	190	&nifp->nbma, &if_ad->addr, dst_proto);
ef9329ac	191	hdr->hop_count = 1;
2fb975da TT	192	if (!(if_ad->flags & NHRP_IFF_REG_NO_UNIQUE))
	193	hdr->flags \|= htons(NHRP_FLAG_REGISTRATION_UNIQUE);
	194
996c9314 LB	195	hdr->u.request_id = htonl(nhrp_reqid_alloc(&nhrp_packet_reqid,
996c9314 LB	196	&r->reqid, nhrp_reg_reply));
2fb975da TT	197
	198	/* FIXME: push CIE for each local protocol address */
	199	cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, NULL, NULL);
	200	cie->prefix_length = 0xff;
	201	cie->holding_time = htons(if_ad->holdtime);
	202	cie->mtu = htons(if_ad->mtu);
	203
	204	nhrp_ext_request(zb, hdr, ifp);
	205
	206	/* Cisco NAT detection extension */
	207	hdr->flags \|= htons(NHRP_FLAG_REGISTRATION_NAT);
	208	ext = nhrp_ext_push(zb, hdr, NHRP_EXTENSION_NAT_ADDRESS);
	209	cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, &nifp->nbma, &if_ad->addr);
55fd6ee9	210	cie->prefix_length = 8 * sockunion_get_addrlen(&if_ad->addr);
2fb975da TT	211	nhrp_ext_complete(zb, ext);
	212
	213	nhrp_packet_complete(zb, hdr);
	214	nhrp_peer_send(r->peer, zb);
	215	zbuf_free(zb);
	216
	217	return 0;
	218	}
	219
	220	static void nhrp_reg_delete(struct nhrp_registration *r)
	221	{
	222	nhrp_peer_notify_del(r->peer, &r->peer_notifier);
	223	nhrp_peer_unref(r->peer);
	224	list_del(&r->reglist_entry);
	225	THREAD_OFF(r->t_register);
	226	XFREE(MTYPE_NHRP_REGISTRATION, r);
	227	}
	228
996c9314 LB	229	static struct nhrp_registration *
996c9314 LB	230	nhrp_reg_by_nbma(struct nhrp_nhs nhs, const union sockunion nbma_addr)
2fb975da TT	231	{
	232	struct nhrp_registration *r;
	233
996c9314 LB	234	list_for_each_entry(
	235	r, &nhs->reglist_head,
	236	reglist_entry) if (sockunion_same(&r->peer->vc->remote.nbma,
	237	nbma_addr)) return r;
2fb975da TT	238	return NULL;
	239	}
	240
996c9314 LB	241	static void nhrp_nhs_resolve_cb(struct resolver_query *q, int n,
996c9314 LB	242	union sockunion *addrs)
2fb975da TT	243	{
	244	struct nhrp_nhs *nhs = container_of(q, struct nhrp_nhs, dns_resolve);
	245	struct nhrp_interface *nifp = nhs->ifp->info;
	246	struct nhrp_registration reg, regn;
	247	int i;
	248
	249	nhs->t_resolve = NULL;
	250	if (n < 0) {
	251	/* Failed, retry in a moment */
ffa2c898 QY	252	thread_add_timer(master, nhrp_nhs_resolve, nhs, 5,
ffa2c898 QY	253	&nhs->t_resolve);
2fb975da TT	254	return;
	255	}
	256
ffa2c898 QY	257	thread_add_timer(master, nhrp_nhs_resolve, nhs, 2 * 60 * 60,
ffa2c898 QY	258	&nhs->t_resolve);
2fb975da	259
996c9314 LB	260	list_for_each_entry(reg, &nhs->reglist_head, reglist_entry) reg->mark =
996c9314 LB	261	1;
2fb975da TT	262
	263	nhs->hub = 0;
	264	for (i = 0; i < n; i++) {
	265	if (sockunion_same(&addrs[i], &nifp->nbma)) {
	266	nhs->hub = 1;
	267	continue;
	268	}
	269
	270	reg = nhrp_reg_by_nbma(nhs, &addrs[i]);
	271	if (reg) {
	272	reg->mark = 0;
	273	continue;
	274	}
	275
	276	reg = XCALLOC(MTYPE_NHRP_REGISTRATION, sizeof(*reg));
	277	reg->peer = nhrp_peer_get(nhs->ifp, &addrs[i]);
	278	reg->nhs = nhs;
	279	reg->timeout = 1;
	280	list_init(&reg->reglist_entry);
	281	list_add_tail(&reg->reglist_entry, &nhs->reglist_head);
996c9314 LB	282	nhrp_peer_notify_add(reg->peer, &reg->peer_notifier,
996c9314 LB	283	nhrp_reg_peer_notify);
ffa2c898 QY	284	thread_add_timer_msec(master, nhrp_reg_send_req, reg, 50,
ffa2c898 QY	285	&reg->t_register);
2fb975da TT	286	}
2fb975da TT	287
996c9314 LB	288	list_for_each_entry_safe(reg, regn, &nhs->reglist_head, reglist_entry)
996c9314 LB	289	{
2fb975da TT	290	if (reg->mark)
	291	nhrp_reg_delete(reg);
	292	}
	293	}
	294
	295	static int nhrp_nhs_resolve(struct thread *t)
	296	{
	297	struct nhrp_nhs *nhs = THREAD_ARG(t);
	298
996c9314 LB	299	resolver_resolve(&nhs->dns_resolve, AF_INET, nhs->nbma_fqdn,
996c9314 LB	300	nhrp_nhs_resolve_cb);
2fb975da TT	301
	302	return 0;
	303	}
	304
996c9314 LB	305	int nhrp_nhs_add(struct interface ifp, afi_t afi, union sockunion proto_addr,
996c9314 LB	306	const char *nbma_fqdn)
2fb975da TT	307	{
	308	struct nhrp_interface *nifp = ifp->info;
	309	struct nhrp_nhs *nhs;
	310
996c9314 LB	311	if (sockunion_family(proto_addr) != AF_UNSPEC
996c9314 LB	312	&& sockunion_family(proto_addr) != afi2family(afi))
2fb975da TT	313	return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH;
2fb975da TT	314
996c9314 LB	315	list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry)
	316	{
	317	if (sockunion_family(&nhs->proto_addr) != AF_UNSPEC
	318	&& sockunion_family(proto_addr) != AF_UNSPEC
	319	&& sockunion_same(&nhs->proto_addr, proto_addr))
2fb975da TT	320	return NHRP_ERR_ENTRY_EXISTS;
	321
	322	if (strcmp(nhs->nbma_fqdn, nbma_fqdn) == 0)
	323	return NHRP_ERR_ENTRY_EXISTS;
	324	}
	325
	326	nhs = XMALLOC(MTYPE_NHRP_NHS, sizeof(struct nhrp_nhs));
2fb975da	327
996c9314	328	*nhs = (struct nhrp_nhs){
2fb975da TT	329	.afi = afi,
	330	.ifp = ifp,
	331	.proto_addr = *proto_addr,
	332	.nbma_fqdn = strdup(nbma_fqdn),
	333	.reglist_head = LIST_INITIALIZER(nhs->reglist_head),
	334	};
	335	list_add_tail(&nhs->nhslist_entry, &nifp->afi[afi].nhslist_head);
ffa2c898 QY	336	thread_add_timer_msec(master, nhrp_nhs_resolve, nhs, 1000,
ffa2c898 QY	337	&nhs->t_resolve);
2fb975da TT	338
	339	return NHRP_OK;
	340	}
	341
996c9314 LB	342	int nhrp_nhs_del(struct interface ifp, afi_t afi, union sockunion proto_addr,
996c9314 LB	343	const char *nbma_fqdn)
2fb975da TT	344	{
	345	struct nhrp_interface *nifp = ifp->info;
	346	struct nhrp_nhs nhs, nnhs;
	347	int ret = NHRP_ERR_ENTRY_NOT_FOUND;
	348
996c9314 LB	349	if (sockunion_family(proto_addr) != AF_UNSPEC
996c9314 LB	350	&& sockunion_family(proto_addr) != afi2family(afi))
2fb975da TT	351	return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH;
2fb975da TT	352
996c9314 LB	353	list_for_each_entry_safe(nhs, nnhs, &nifp->afi[afi].nhslist_head,
	354	nhslist_entry)
	355	{
2fb975da TT	356	if (!sockunion_same(&nhs->proto_addr, proto_addr))
	357	continue;
	358	if (strcmp(nhs->nbma_fqdn, nbma_fqdn) != 0)
	359	continue;
	360
	361	nhrp_nhs_free(nhs);
	362	ret = NHRP_OK;
	363	}
	364
	365	return ret;
	366	}
	367
	368	int nhrp_nhs_free(struct nhrp_nhs *nhs)
	369	{
	370	struct nhrp_registration r, rn;
	371
	372	list_for_each_entry_safe(r, rn, &nhs->reglist_head, reglist_entry)
	373	nhrp_reg_delete(r);
	374	THREAD_OFF(nhs->t_resolve);
	375	list_del(&nhs->nhslist_entry);
996c9314	376	free((void *)nhs->nbma_fqdn);
2fb975da TT	377	XFREE(MTYPE_NHRP_NHS, nhs);
	378	return 0;
	379	}
	380
	381	void nhrp_nhs_terminate(void)
	382	{
f4e14fdb	383	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
2fb975da TT	384	struct interface *ifp;
	385	struct nhrp_interface *nifp;
	386	struct nhrp_nhs nhs, tmp;
2fb975da TT	387	afi_t afi;
2fb975da TT	388
451fda4f	389	FOR_ALL_INTERFACES (vrf, ifp) {
2fb975da TT	390	nifp = ifp->info;
2fb975da TT	391	for (afi = 0; afi < AFI_MAX; afi++) {
996c9314 LB	392	list_for_each_entry_safe(
	393	nhs, tmp, &nifp->afi[afi].nhslist_head,
	394	nhslist_entry) nhrp_nhs_free(nhs);
2fb975da TT	395	}
	396	}
	397	}
0ca036b4	398
996c9314 LB	399	void nhrp_nhs_foreach(struct interface *ifp, afi_t afi,
	400	void (cb)(struct nhrp_nhs , struct nhrp_registration *,
	401	void *),
	402	void *ctx)
0ca036b4 TT	403	{
	404	struct nhrp_interface *nifp = ifp->info;
	405	struct nhrp_nhs *nhs;
	406	struct nhrp_registration *reg;
	407
996c9314 LB	408	list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry)
996c9314 LB	409	{
0ca036b4	410	if (!list_empty(&nhs->reglist_head)) {
996c9314 LB	411	list_for_each_entry(reg, &nhs->reglist_head,
996c9314 LB	412	reglist_entry) cb(nhs, reg, ctx);
0ca036b4 TT	413	} else
	414	cb(nhs, 0, ctx);
	415	}
	416	}