[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;
	int ok = 0, holdtime;
	unsigned short mtu = 0;

	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: %pSU: %d",
		       proto, cie->code);
		if (!((cie->code == NHRP_CODE_SUCCESS)
		      || (cie->code == NHRP_CODE_ADMINISTRATIVELY_PROHIBITED
			  && nhs->hub)))
			ok = 0;
		mtu = ntohs(cie->mtu);
		debugf(NHRP_DEBUG_COMMON, "NHS: CIE MTU: %d", mtu);
	}

	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: %pSU",
				       ifp->name, &nifp->nbma);
			}
			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), mtu, 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);

	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 %pSU",
		       &r->peer->vc->remote.nbma);
		THREAD_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 %pSU",
		       &r->peer->vc->remote.nbma);
		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);
	/* RFC2332 5.2.1 if unique is set then prefix length must be 0xff */
	cie->prefix_length = (if_ad->flags & NHRP_IFF_REG_NO_UNIQUE) ? 8 * sockunion_get_addrlen(dst_proto) : 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, const char *errstr,
				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_interface_del(struct interface *ifp)
{
	struct nhrp_interface *nifp = ifp->info;
	struct nhrp_nhs *nhs, *tmp;
	afi_t afi;

	for (afi = 0; afi < AFI_MAX; afi++) {
		debugf(NHRP_DEBUG_COMMON, "Cleaning up nhs entries (%d)",
		       !list_empty(&nifp->afi[afi].nhslist_head));

		list_for_each_entry_safe(nhs, tmp, &nifp->afi[afi].nhslist_head,
					 nhslist_entry)
		{
			nhrp_nhs_free(nhs);
		}
	}
}

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;
2fb975da	36	int ok = 0, holdtime;
659fde26	37	unsigned short mtu = 0;
2fb975da TT	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;
b6c48481 DS	54	debugf(NHRP_DEBUG_COMMON, "NHS: CIE registration: %pSU: %d",
b6c48481 DS	55	proto, cie->code);
996c9314 LB	56	if (!((cie->code == NHRP_CODE_SUCCESS)
	57	\|\| (cie->code == NHRP_CODE_ADMINISTRATIVELY_PROHIBITED
	58	&& nhs->hub)))
2fb975da	59	ok = 0;
659fde26 GG	60	mtu = ntohs(cie->mtu);
659fde26 GG	61	debugf(NHRP_DEBUG_COMMON, "NHS: CIE MTU: %d", mtu);
2fb975da TT	62	}
	63
	64	if (!ok)
	65	return;
	66
	67	/* Parse extensions */
	68	sockunion_family(&nifp->nat_nbma) = AF_UNSPEC;
	69	while ((ext = nhrp_ext_pull(&p->extensions, &extpl)) != NULL) {
	70	switch (htons(ext->type) & ~NHRP_EXTENSION_FLAG_COMPULSORY) {
	71	case NHRP_EXTENSION_NAT_ADDRESS:
	72	/* NHS adds second CIE if NAT is detected */
996c9314 LB	73	if (nhrp_cie_pull(&extpl, p->hdr, &cie_nbma, &cie_proto)
	74	&& nhrp_cie_pull(&extpl, p->hdr, &cie_nbma,
	75	&cie_proto)) {
2fb975da	76	nifp->nat_nbma = cie_nbma;
996c9314	77	debugf(NHRP_DEBUG_IF,
b6c48481 DS	78	"%s: NAT detected, real NBMA address: %pSU",
b6c48481 DS	79	ifp->name, &nifp->nbma);
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)
996c9314 LB	98	nhrp_cache_update_binding(c, NHRP_CACHE_NHS, holdtime,
659fde26	99	nhrp_peer_ref(r->peer), mtu, 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
	131	switch (cmd) {
	132	case NOTIFY_PEER_UP:
	133	case NOTIFY_PEER_DOWN:
	134	case NOTIFY_PEER_IFCONFIG_CHANGED:
	135	case NOTIFY_PEER_MTU_CHANGED:
b6c48481 DS	136	debugf(NHRP_DEBUG_COMMON, "NHS: Flush timer for %pSU",
b6c48481 DS	137	&r->peer->vc->remote.nbma);
50478845	138	THREAD_OFF(r->t_register);
ffa2c898 QY	139	thread_add_timer_msec(master, nhrp_reg_send_req, r, 10,
ffa2c898 QY	140	&r->t_register);
2fb975da TT	141	break;
	142	}
	143	}
	144
	145	static int nhrp_reg_send_req(struct thread *t)
	146	{
	147	struct nhrp_registration *r = THREAD_ARG(t);
	148	struct nhrp_nhs *nhs = r->nhs;
	149	char buf1[SU_ADDRSTRLEN], buf2[SU_ADDRSTRLEN];
	150	struct interface *ifp = nhs->ifp;
	151	struct nhrp_interface *nifp = ifp->info;
	152	struct nhrp_afi_data *if_ad = &nifp->afi[nhs->afi];
	153	union sockunion *dst_proto;
	154	struct zbuf *zb;
	155	struct nhrp_packet_header *hdr;
	156	struct nhrp_extension_header *ext;
	157	struct nhrp_cie_header *cie;
	158
	159	r->t_register = NULL;
	160	if (!nhrp_peer_check(r->peer, 2)) {
b6c48481 DS	161	debugf(NHRP_DEBUG_COMMON, "NHS: Waiting link for %pSU",
b6c48481 DS	162	&r->peer->vc->remote.nbma);
ffa2c898 QY	163	thread_add_timer(master, nhrp_reg_send_req, r, 120,
ffa2c898 QY	164	&r->t_register);
2fb975da TT	165	return 0;
	166	}
	167
ffa2c898 QY	168	thread_add_timer(master, nhrp_reg_timeout, r, r->timeout,
ffa2c898 QY	169	&r->t_register);
2fb975da TT	170
	171	/* RFC2332 5.2.3 NHC uses it's own address as dst if NHS is unknown */
	172	dst_proto = &nhs->proto_addr;
	173	if (sockunion_family(dst_proto) == AF_UNSPEC)
	174	dst_proto = &if_ad->addr;
	175
	176	sockunion2str(&if_ad->addr, buf1, sizeof(buf1));
	177	sockunion2str(dst_proto, buf2, sizeof(buf2));
996c9314 LB	178	debugf(NHRP_DEBUG_COMMON, "NHS: Register %s -> %s (timeout %d)", buf1,
996c9314 LB	179	buf2, r->timeout);
2fb975da TT	180
	181	/* No protocol address configured for tunnel interface */
	182	if (sockunion_family(&if_ad->addr) == AF_UNSPEC)
	183	return 0;
	184
	185	zb = zbuf_alloc(1400);
996c9314 LB	186	hdr = nhrp_packet_push(zb, NHRP_PACKET_REGISTRATION_REQUEST,
996c9314 LB	187	&nifp->nbma, &if_ad->addr, dst_proto);
ef9329ac	188	hdr->hop_count = 1;
2fb975da TT	189	if (!(if_ad->flags & NHRP_IFF_REG_NO_UNIQUE))
	190	hdr->flags \|= htons(NHRP_FLAG_REGISTRATION_UNIQUE);
	191
996c9314 LB	192	hdr->u.request_id = htonl(nhrp_reqid_alloc(&nhrp_packet_reqid,
996c9314 LB	193	&r->reqid, nhrp_reg_reply));
2fb975da TT	194
	195	/* FIXME: push CIE for each local protocol address */
	196	cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, NULL, NULL);
f7f9a377 AL	197	/* RFC2332 5.2.1 if unique is set then prefix length must be 0xff */
f7f9a377 AL	198	cie->prefix_length = (if_ad->flags & NHRP_IFF_REG_NO_UNIQUE) ? 8 * sockunion_get_addrlen(dst_proto) : 0xff;
2fb975da TT	199	cie->holding_time = htons(if_ad->holdtime);
	200	cie->mtu = htons(if_ad->mtu);
	201
	202	nhrp_ext_request(zb, hdr, ifp);
	203
	204	/* Cisco NAT detection extension */
	205	hdr->flags \|= htons(NHRP_FLAG_REGISTRATION_NAT);
	206	ext = nhrp_ext_push(zb, hdr, NHRP_EXTENSION_NAT_ADDRESS);
	207	cie = nhrp_cie_push(zb, NHRP_CODE_SUCCESS, &nifp->nbma, &if_ad->addr);
55fd6ee9	208	cie->prefix_length = 8 * sockunion_get_addrlen(&if_ad->addr);
2fb975da TT	209	nhrp_ext_complete(zb, ext);
	210
	211	nhrp_packet_complete(zb, hdr);
	212	nhrp_peer_send(r->peer, zb);
	213	zbuf_free(zb);
	214
	215	return 0;
	216	}
	217
	218	static void nhrp_reg_delete(struct nhrp_registration *r)
	219	{
	220	nhrp_peer_notify_del(r->peer, &r->peer_notifier);
	221	nhrp_peer_unref(r->peer);
	222	list_del(&r->reglist_entry);
	223	THREAD_OFF(r->t_register);
	224	XFREE(MTYPE_NHRP_REGISTRATION, r);
	225	}
	226
996c9314 LB	227	static struct nhrp_registration *
996c9314 LB	228	nhrp_reg_by_nbma(struct nhrp_nhs nhs, const union sockunion nbma_addr)
2fb975da TT	229	{
	230	struct nhrp_registration *r;
	231
996c9314 LB	232	list_for_each_entry(
	233	r, &nhs->reglist_head,
	234	reglist_entry) if (sockunion_same(&r->peer->vc->remote.nbma,
	235	nbma_addr)) return r;
2fb975da TT	236	return NULL;
	237	}
	238
3286ca07 DL	239	static void nhrp_nhs_resolve_cb(struct resolver_query q, const char errstr,
3286ca07 DL	240	int n, union sockunion *addrs)
2fb975da TT	241	{
	242	struct nhrp_nhs *nhs = container_of(q, struct nhrp_nhs, dns_resolve);
	243	struct nhrp_interface *nifp = nhs->ifp->info;
	244	struct nhrp_registration reg, regn;
	245	int i;
	246
	247	nhs->t_resolve = NULL;
	248	if (n < 0) {
	249	/* Failed, retry in a moment */
ffa2c898 QY	250	thread_add_timer(master, nhrp_nhs_resolve, nhs, 5,
ffa2c898 QY	251	&nhs->t_resolve);
2fb975da TT	252	return;
	253	}
	254
ffa2c898 QY	255	thread_add_timer(master, nhrp_nhs_resolve, nhs, 2 * 60 * 60,
ffa2c898 QY	256	&nhs->t_resolve);
2fb975da	257
996c9314 LB	258	list_for_each_entry(reg, &nhs->reglist_head, reglist_entry) reg->mark =
996c9314 LB	259	1;
2fb975da TT	260
	261	nhs->hub = 0;
	262	for (i = 0; i < n; i++) {
	263	if (sockunion_same(&addrs[i], &nifp->nbma)) {
	264	nhs->hub = 1;
	265	continue;
	266	}
	267
	268	reg = nhrp_reg_by_nbma(nhs, &addrs[i]);
	269	if (reg) {
	270	reg->mark = 0;
	271	continue;
	272	}
	273
	274	reg = XCALLOC(MTYPE_NHRP_REGISTRATION, sizeof(*reg));
	275	reg->peer = nhrp_peer_get(nhs->ifp, &addrs[i]);
	276	reg->nhs = nhs;
	277	reg->timeout = 1;
	278	list_init(&reg->reglist_entry);
	279	list_add_tail(&reg->reglist_entry, &nhs->reglist_head);
996c9314 LB	280	nhrp_peer_notify_add(reg->peer, &reg->peer_notifier,
996c9314 LB	281	nhrp_reg_peer_notify);
ffa2c898 QY	282	thread_add_timer_msec(master, nhrp_reg_send_req, reg, 50,
ffa2c898 QY	283	&reg->t_register);
2fb975da TT	284	}
2fb975da TT	285
996c9314 LB	286	list_for_each_entry_safe(reg, regn, &nhs->reglist_head, reglist_entry)
996c9314 LB	287	{
2fb975da TT	288	if (reg->mark)
	289	nhrp_reg_delete(reg);
	290	}
	291	}
	292
	293	static int nhrp_nhs_resolve(struct thread *t)
	294	{
	295	struct nhrp_nhs *nhs = THREAD_ARG(t);
	296
996c9314 LB	297	resolver_resolve(&nhs->dns_resolve, AF_INET, nhs->nbma_fqdn,
996c9314 LB	298	nhrp_nhs_resolve_cb);
2fb975da TT	299
	300	return 0;
	301	}
	302
996c9314 LB	303	int nhrp_nhs_add(struct interface ifp, afi_t afi, union sockunion proto_addr,
996c9314 LB	304	const char *nbma_fqdn)
2fb975da TT	305	{
	306	struct nhrp_interface *nifp = ifp->info;
	307	struct nhrp_nhs *nhs;
	308
996c9314 LB	309	if (sockunion_family(proto_addr) != AF_UNSPEC
996c9314 LB	310	&& sockunion_family(proto_addr) != afi2family(afi))
2fb975da TT	311	return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH;
2fb975da TT	312
996c9314 LB	313	list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry)
	314	{
	315	if (sockunion_family(&nhs->proto_addr) != AF_UNSPEC
	316	&& sockunion_family(proto_addr) != AF_UNSPEC
	317	&& sockunion_same(&nhs->proto_addr, proto_addr))
2fb975da TT	318	return NHRP_ERR_ENTRY_EXISTS;
	319
	320	if (strcmp(nhs->nbma_fqdn, nbma_fqdn) == 0)
	321	return NHRP_ERR_ENTRY_EXISTS;
	322	}
	323
	324	nhs = XMALLOC(MTYPE_NHRP_NHS, sizeof(struct nhrp_nhs));
2fb975da	325
996c9314	326	*nhs = (struct nhrp_nhs){
2fb975da TT	327	.afi = afi,
	328	.ifp = ifp,
	329	.proto_addr = *proto_addr,
	330	.nbma_fqdn = strdup(nbma_fqdn),
	331	.reglist_head = LIST_INITIALIZER(nhs->reglist_head),
	332	};
	333	list_add_tail(&nhs->nhslist_entry, &nifp->afi[afi].nhslist_head);
ffa2c898 QY	334	thread_add_timer_msec(master, nhrp_nhs_resolve, nhs, 1000,
ffa2c898 QY	335	&nhs->t_resolve);
2fb975da TT	336
	337	return NHRP_OK;
	338	}
	339
996c9314 LB	340	int nhrp_nhs_del(struct interface ifp, afi_t afi, union sockunion proto_addr,
996c9314 LB	341	const char *nbma_fqdn)
2fb975da TT	342	{
	343	struct nhrp_interface *nifp = ifp->info;
	344	struct nhrp_nhs nhs, nnhs;
	345	int ret = NHRP_ERR_ENTRY_NOT_FOUND;
	346
996c9314 LB	347	if (sockunion_family(proto_addr) != AF_UNSPEC
996c9314 LB	348	&& sockunion_family(proto_addr) != afi2family(afi))
2fb975da TT	349	return NHRP_ERR_PROTOCOL_ADDRESS_MISMATCH;
2fb975da TT	350
996c9314 LB	351	list_for_each_entry_safe(nhs, nnhs, &nifp->afi[afi].nhslist_head,
	352	nhslist_entry)
	353	{
2fb975da TT	354	if (!sockunion_same(&nhs->proto_addr, proto_addr))
	355	continue;
	356	if (strcmp(nhs->nbma_fqdn, nbma_fqdn) != 0)
	357	continue;
	358
	359	nhrp_nhs_free(nhs);
	360	ret = NHRP_OK;
	361	}
	362
	363	return ret;
	364	}
	365
	366	int nhrp_nhs_free(struct nhrp_nhs *nhs)
	367	{
	368	struct nhrp_registration r, rn;
	369
	370	list_for_each_entry_safe(r, rn, &nhs->reglist_head, reglist_entry)
	371	nhrp_reg_delete(r);
	372	THREAD_OFF(nhs->t_resolve);
	373	list_del(&nhs->nhslist_entry);
996c9314	374	free((void *)nhs->nbma_fqdn);
2fb975da TT	375	XFREE(MTYPE_NHRP_NHS, nhs);
	376	return 0;
	377	}
	378
ee72f0a0 RD	379	void nhrp_nhs_interface_del(struct interface *ifp)
	380	{
	381	struct nhrp_interface *nifp = ifp->info;
	382	struct nhrp_nhs nhs, tmp;
	383	afi_t afi;
	384
	385	for (afi = 0; afi < AFI_MAX; afi++) {
	386	debugf(NHRP_DEBUG_COMMON, "Cleaning up nhs entries (%d)",
	387	!list_empty(&nifp->afi[afi].nhslist_head));
	388
	389	list_for_each_entry_safe(nhs, tmp, &nifp->afi[afi].nhslist_head,
	390	nhslist_entry)
	391	{
	392	nhrp_nhs_free(nhs);
	393	}
	394	}
	395	}
	396
2fb975da TT	397	void nhrp_nhs_terminate(void)
2fb975da TT	398	{
f4e14fdb	399	struct vrf *vrf = vrf_lookup_by_id(VRF_DEFAULT);
2fb975da TT	400	struct interface *ifp;
	401	struct nhrp_interface *nifp;
	402	struct nhrp_nhs nhs, tmp;
2fb975da TT	403	afi_t afi;
2fb975da TT	404
451fda4f	405	FOR_ALL_INTERFACES (vrf, ifp) {
2fb975da TT	406	nifp = ifp->info;
2fb975da TT	407	for (afi = 0; afi < AFI_MAX; afi++) {
996c9314 LB	408	list_for_each_entry_safe(
	409	nhs, tmp, &nifp->afi[afi].nhslist_head,
	410	nhslist_entry) nhrp_nhs_free(nhs);
2fb975da TT	411	}
	412	}
	413	}
0ca036b4	414
996c9314 LB	415	void nhrp_nhs_foreach(struct interface *ifp, afi_t afi,
	416	void (cb)(struct nhrp_nhs , struct nhrp_registration *,
	417	void *),
	418	void *ctx)
0ca036b4 TT	419	{
	420	struct nhrp_interface *nifp = ifp->info;
	421	struct nhrp_nhs *nhs;
	422	struct nhrp_registration *reg;
	423
996c9314 LB	424	list_for_each_entry(nhs, &nifp->afi[afi].nhslist_head, nhslist_entry)
996c9314 LB	425	{
0ca036b4	426	if (!list_empty(&nhs->reglist_head)) {
996c9314 LB	427	list_for_each_entry(reg, &nhs->reglist_head,
996c9314 LB	428	reglist_entry) cb(nhs, reg, ctx);
0ca036b4 TT	429	} else
	430	cb(nhs, 0, ctx);
	431	}
	432	}