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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/ospfd/lsack.c	Lines:	3	122	2.5 %
Date:	2017-11-07	Branches:	1	82	1.2 %


/*	$OpenBSD: lsack.c,v 1.21 2014/10/25 03:23:49 lteo Exp $ */

/*
 * Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>

#include <stdlib.h>
#include <string.h>

#include "ospfd.h"
#include "ospf.h"
#include "log.h"
#include "ospfe.h"

int		 send_ls_ack(struct iface *, struct in_addr, struct ibuf *);
struct ibuf	*prepare_ls_ack(struct iface *);
void		 start_ls_ack_tx_timer_now(struct iface *);

/* link state acknowledgement packet handling */
struct ibuf *
prepare_ls_ack(struct iface *iface)
{
	struct ibuf	*buf;

	if ((buf = ibuf_open(iface->mtu - sizeof(struct ip))) == NULL) {
		log_warn("prepare_ls_ack");
		return (NULL);
	}

	/* OSPF header */
	if (gen_ospf_hdr(buf, iface, PACKET_TYPE_LS_ACK)) {
		log_warn("prepare_ls_ack");
		ibuf_free(buf);
		return (NULL);
	}

	return (buf);
}

int
send_ls_ack(struct iface *iface, struct in_addr addr, struct ibuf *buf)
{
	struct sockaddr_in	dst;
	int			ret;

	/* update authentication and calculate checksum */
	if (auth_gen(buf, iface)) {
		log_warn("send_ls_ack");
		return (-1);
	}

	dst.sin_family = AF_INET;
	dst.sin_len = sizeof(struct sockaddr_in);
	dst.sin_addr.s_addr = addr.s_addr;

	ret = send_packet(iface, buf, &dst);
	return (ret);
}

int
send_direct_ack(struct iface *iface, struct in_addr addr, void *d, size_t len)
{
	struct ibuf	*buf;
	int		 ret;

	if ((buf = prepare_ls_ack(iface)) == NULL)
		return (-1);

	/* LS ack(s) */
	if (ibuf_add(buf, d, len)) {
		log_warn("send_direct_ack");
		ibuf_free(buf);
		return (-1);
	}

	ret = send_ls_ack(iface, addr, buf);
	ibuf_free(buf);
	return (ret);
}

void
recv_ls_ack(struct nbr *nbr, char *buf, u_int16_t len)
{
	struct lsa_hdr	 lsa_hdr;

	switch (nbr->state) {
	case NBR_STA_DOWN:
	case NBR_STA_ATTEMPT:
	case NBR_STA_INIT:
	case NBR_STA_2_WAY:
	case NBR_STA_XSTRT:
	case NBR_STA_SNAP:
		log_debug("recv_ls_ack: packet ignored in state %s, "
		    "neighbor ID %s", nbr_state_name(nbr->state),
		    inet_ntoa(nbr->id));
		break;
	case NBR_STA_XCHNG:
	case NBR_STA_LOAD:
	case NBR_STA_FULL:
		while (len >= sizeof(lsa_hdr)) {
			memcpy(&lsa_hdr, buf, sizeof(lsa_hdr));

			if (lsa_hdr_check(nbr, &lsa_hdr)) {
				/* try both list in case of DROTHER */
				if (nbr->iface->state & IF_STA_DROTHER)
					(void)ls_retrans_list_del(
					    nbr->iface->self, &lsa_hdr);
				(void)ls_retrans_list_del(nbr, &lsa_hdr);
			}

			buf += sizeof(lsa_hdr);
			len -= sizeof(lsa_hdr);
		}
		if (len > 0) {
			log_warnx("recv_ls_ack: bad packet size, "
			    "neighbor ID %s", inet_ntoa(nbr->id));
			return;
		}
		break;
	default:
		fatalx("recv_ls_ack: unknown neighbor state");
	}
}

int
lsa_hdr_check(struct nbr *nbr, struct lsa_hdr *lsa_hdr)
{
	/* invalid age */
	if ((ntohs(lsa_hdr->age) < 1) || (ntohs(lsa_hdr->age) > MAX_AGE)) {
		log_debug("lsa_hdr_check: invalid age, neighbor ID %s",
		     inet_ntoa(nbr->id));
		return (0);
	}

	/* invalid type */
	switch (lsa_hdr->type) {
	case LSA_TYPE_ROUTER:
	case LSA_TYPE_NETWORK:
	case LSA_TYPE_SUM_NETWORK:
	case LSA_TYPE_SUM_ROUTER:
	case LSA_TYPE_EXTERNAL:
		break;
	default:
		log_debug("lsa_hdr_check: invalid LSA type %d, neighbor ID %s",
		    lsa_hdr->type, inet_ntoa(nbr->id));
		return (0);
	}

	/* invalid sequence number */
	if (ntohl(lsa_hdr->seq_num) == RESV_SEQ_NUM) {
		log_debug("ls_hdr_check: invalid seq num, neighbor ID %s",
			inet_ntoa(nbr->id));
		return (0);
	}

	return (1);
}

/* link state ack list */
void
ls_ack_list_add(struct iface *iface, struct lsa_hdr *lsa)
{
	struct lsa_entry	*le;

	if (lsa == NULL)
		fatalx("ls_ack_list_add: no LSA header");

	if ((le = calloc(1, sizeof(*le))) == NULL)
		fatal("ls_ack_list_add");

	if (ls_ack_list_empty(iface))
		start_ls_ack_tx_timer(iface);

	TAILQ_INSERT_TAIL(&iface->ls_ack_list, le, entry);
	le->le_lsa = lsa;
	iface->ls_ack_cnt++;

	/* reschedule now if we have enough for a reasonably sized packet */
	if (iface->ls_ack_cnt > IP_MSS / sizeof(struct lsa_hdr))
		start_ls_ack_tx_timer_now(iface);
}

void
ls_ack_list_free(struct iface *iface, struct lsa_entry *le)
{
	TAILQ_REMOVE(&iface->ls_ack_list, le, entry);
	free(le->le_lsa);
	free(le);

	iface->ls_ack_cnt--;
}

void
ls_ack_list_clr(struct iface *iface)
{
	struct lsa_entry	*le;

	while ((le = TAILQ_FIRST(&iface->ls_ack_list)) != NULL) {
		TAILQ_REMOVE(&iface->ls_ack_list, le, entry);
		free(le->le_lsa);
		free(le);
	}
	iface->ls_ack_cnt = 0;
}

int
ls_ack_list_empty(struct iface *iface)
{
	return (TAILQ_EMPTY(&iface->ls_ack_list));
}

/* timers */
/* ARGSUSED */
void
ls_ack_tx_timer(int fd, short event, void *arg)
{
	struct in_addr		 addr;
	struct iface		*iface = arg;
	struct lsa_entry	*le, *nle;
	struct nbr		*nbr;
	struct ibuf		*buf;
	int			 cnt;

	while (!ls_ack_list_empty(iface)) {
		if ((buf = prepare_ls_ack(iface)) == NULL)
			fatal("ls_ack_tx_timer");
		cnt = 0;

		for (le = TAILQ_FIRST(&iface->ls_ack_list); le != NULL;
		    le = nle) {
			nle = TAILQ_NEXT(le, entry);
			if (ibuf_left(buf) < sizeof(struct lsa_hdr) +
			    MD5_DIGEST_LENGTH)
				break;
			if (ibuf_add(buf, le->le_lsa, sizeof(struct lsa_hdr)))
				break;
			ls_ack_list_free(iface, le);
			cnt++;
		}
		if (cnt == 0) {
			log_warnx("ls_ack_tx_timer: lost in space");
			ibuf_free(buf);
			return;
		}

		/* send LS ack(s) but first set correct destination */
		switch (iface->type) {
		case IF_TYPE_POINTOPOINT:
			inet_aton(AllSPFRouters, &addr);
			send_ls_ack(iface, addr, buf);
			break;
		case IF_TYPE_BROADCAST:
			if (iface->state & IF_STA_DRORBDR)
				inet_aton(AllSPFRouters, &addr);
			else
				inet_aton(AllDRouters, &addr);
			send_ls_ack(iface, addr, buf);
			break;
		case IF_TYPE_NBMA:
		case IF_TYPE_POINTOMULTIPOINT:
		case IF_TYPE_VIRTUALLINK:
			LIST_FOREACH(nbr, &iface->nbr_list, entry) {
				if (nbr == iface->self)
					continue;
				if (!(nbr->state & NBR_STA_FLOOD))
					continue;
				send_ls_ack(iface, nbr->addr, buf);
			}
			break;
		default:
			fatalx("lsa_ack_tx_timer: unknown interface type");
		}
		ibuf_free(buf);
	}
}

void
start_ls_ack_tx_timer(struct iface *iface)
{
	struct timeval tv;

	timerclear(&tv);
	tv.tv_sec = iface->rxmt_interval / 2;

	if (evtimer_add(&iface->lsack_tx_timer, &tv) == -1)
		fatal("start_ls_ack_tx_timer");
}

void
start_ls_ack_tx_timer_now(struct iface *iface)
{
	struct timeval tv;

	timerclear(&tv);
	if (evtimer_add(&iface->lsack_tx_timer, &tv) == -1)
		fatal("start_ls_ack_tx_timer_now");
}

void
stop_ls_ack_tx_timer(struct iface *iface)
{
	if (evtimer_del(&iface->lsack_tx_timer) == -1)
		fatal("stop_ls_ack_tx_timer");
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: lsack.c,v 1.21 2014/10/25 03:23:49 lteo Exp $ */
2
3			/*
4			* Copyright (c) 2004, 2005 Esben Norby <norby@openbsd.org>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/types.h>
20			#include <sys/socket.h>
21			#include <netinet/in.h>
22			#include <netinet/ip.h>
23			#include <arpa/inet.h>
24
25			#include <stdlib.h>
26			#include <string.h>
27
28			#include "ospfd.h"
29			#include "ospf.h"
30			#include "log.h"
31			#include "ospfe.h"
32
33			int send_ls_ack(struct iface , struct in_addr, struct ibuf );
34			struct ibuf prepare_ls_ack(struct iface );
35			void start_ls_ack_tx_timer_now(struct iface *);
36
37			/* link state acknowledgement packet handling */
38			struct ibuf *
39			prepare_ls_ack(struct iface *iface)
40			{
41			struct ibuf *buf;
42
43			if ((buf = ibuf_open(iface->mtu - sizeof(struct ip))) == NULL) {
44			log_warn("prepare_ls_ack");
45			return (NULL);
46			}
47
48			/* OSPF header */
49			if (gen_ospf_hdr(buf, iface, PACKET_TYPE_LS_ACK)) {
50			log_warn("prepare_ls_ack");
51			ibuf_free(buf);
52			return (NULL);
53			}
54
55			return (buf);
56			}
57
58			int
59			send_ls_ack(struct iface iface, struct in_addr addr, struct ibuf buf)
60			{
61			struct sockaddr_in dst;
62			int ret;
63
64			/* update authentication and calculate checksum */
65			if (auth_gen(buf, iface)) {
66			log_warn("send_ls_ack");
67			return (-1);
68			}
69
70			dst.sin_family = AF_INET;
71			dst.sin_len = sizeof(struct sockaddr_in);
72			dst.sin_addr.s_addr = addr.s_addr;
73
74			ret = send_packet(iface, buf, &dst);
75			return (ret);
76			}
77
78			int
79			send_direct_ack(struct iface iface, struct in_addr addr, void d, size_t len)
80			{
81			struct ibuf *buf;
82			int ret;
83
84			if ((buf = prepare_ls_ack(iface)) == NULL)
85			return (-1);
86
87			/* LS ack(s) */
88			if (ibuf_add(buf, d, len)) {
89			log_warn("send_direct_ack");
90			ibuf_free(buf);
91			return (-1);
92			}
93
94			ret = send_ls_ack(iface, addr, buf);
95			ibuf_free(buf);
96			return (ret);
97			}
98
99			void
100			recv_ls_ack(struct nbr nbr, char buf, u_int16_t len)
101			{
102			struct lsa_hdr lsa_hdr;
103
104			switch (nbr->state) {
105			case NBR_STA_DOWN:
106			case NBR_STA_ATTEMPT:
107			case NBR_STA_INIT:
108			case NBR_STA_2_WAY:
109			case NBR_STA_XSTRT:
110			case NBR_STA_SNAP:
111			log_debug("recv_ls_ack: packet ignored in state %s, "
112			"neighbor ID %s", nbr_state_name(nbr->state),
113			inet_ntoa(nbr->id));
114			break;
115			case NBR_STA_XCHNG:
116			case NBR_STA_LOAD:
117			case NBR_STA_FULL:
118			while (len >= sizeof(lsa_hdr)) {
119			memcpy(&lsa_hdr, buf, sizeof(lsa_hdr));
120
121			if (lsa_hdr_check(nbr, &lsa_hdr)) {
122			/* try both list in case of DROTHER */
123			if (nbr->iface->state & IF_STA_DROTHER)
124			(void)ls_retrans_list_del(
125			nbr->iface->self, &lsa_hdr);
126			(void)ls_retrans_list_del(nbr, &lsa_hdr);
127			}
128
129			buf += sizeof(lsa_hdr);
130			len -= sizeof(lsa_hdr);
131			}
132			if (len > 0) {
133			log_warnx("recv_ls_ack: bad packet size, "
134			"neighbor ID %s", inet_ntoa(nbr->id));
135			return;
136			}
137			break;
138			default:
139			fatalx("recv_ls_ack: unknown neighbor state");
140			}
141			}
142
143			int
144			lsa_hdr_check(struct nbr nbr, struct lsa_hdr lsa_hdr)
145			{
146			/* invalid age */
147			if ((ntohs(lsa_hdr->age) < 1) \|\| (ntohs(lsa_hdr->age) > MAX_AGE)) {
148			log_debug("lsa_hdr_check: invalid age, neighbor ID %s",
149			inet_ntoa(nbr->id));
150			return (0);
151			}
152
153			/* invalid type */
154			switch (lsa_hdr->type) {
155			case LSA_TYPE_ROUTER:
156			case LSA_TYPE_NETWORK:
157			case LSA_TYPE_SUM_NETWORK:
158			case LSA_TYPE_SUM_ROUTER:
159			case LSA_TYPE_EXTERNAL:
160			break;
161			default:
162			log_debug("lsa_hdr_check: invalid LSA type %d, neighbor ID %s",
163			lsa_hdr->type, inet_ntoa(nbr->id));
164			return (0);
165			}
166
167			/* invalid sequence number */
168			if (ntohl(lsa_hdr->seq_num) == RESV_SEQ_NUM) {
169			log_debug("ls_hdr_check: invalid seq num, neighbor ID %s",
170			inet_ntoa(nbr->id));
171			return (0);
172			}
173
174			return (1);
175			}
176
177			/* link state ack list */
178			void
179			ls_ack_list_add(struct iface iface, struct lsa_hdr lsa)
180			{
181			struct lsa_entry *le;
182
183			if (lsa == NULL)
184			fatalx("ls_ack_list_add: no LSA header");
185
186			if ((le = calloc(1, sizeof(*le))) == NULL)
187			fatal("ls_ack_list_add");
188
189			if (ls_ack_list_empty(iface))
190			start_ls_ack_tx_timer(iface);
191
192			TAILQ_INSERT_TAIL(&iface->ls_ack_list, le, entry);
193			le->le_lsa = lsa;
194			iface->ls_ack_cnt++;
195
196			/* reschedule now if we have enough for a reasonably sized packet */
197			if (iface->ls_ack_cnt > IP_MSS / sizeof(struct lsa_hdr))
198			start_ls_ack_tx_timer_now(iface);
199			}
200
201			void
202			ls_ack_list_free(struct iface iface, struct lsa_entry le)
203			{
204			TAILQ_REMOVE(&iface->ls_ack_list, le, entry);
205			free(le->le_lsa);
206			free(le);
207
208			iface->ls_ack_cnt--;
209			}
210
211			void
212			ls_ack_list_clr(struct iface *iface)
213			{
214			struct lsa_entry *le;
215
216	✗✓	48	while ((le = TAILQ_FIRST(&iface->ls_ack_list)) != NULL) {
217			TAILQ_REMOVE(&iface->ls_ack_list, le, entry);
218			free(le->le_lsa);
219			free(le);
220			}
221		16	iface->ls_ack_cnt = 0;
222		16	}
223
224			int
225			ls_ack_list_empty(struct iface *iface)
226			{
227			return (TAILQ_EMPTY(&iface->ls_ack_list));
228			}
229
230			/* timers */
231			/* ARGSUSED */
232			void
233			ls_ack_tx_timer(int fd, short event, void *arg)
234			{
235			struct in_addr addr;
236			struct iface *iface = arg;
237			struct lsa_entry le, nle;
238			struct nbr *nbr;
239			struct ibuf *buf;
240			int cnt;
241
242			while (!ls_ack_list_empty(iface)) {
243			if ((buf = prepare_ls_ack(iface)) == NULL)
244			fatal("ls_ack_tx_timer");
245			cnt = 0;
246
247			for (le = TAILQ_FIRST(&iface->ls_ack_list); le != NULL;
248			le = nle) {
249			nle = TAILQ_NEXT(le, entry);
250			if (ibuf_left(buf) < sizeof(struct lsa_hdr) +
251			MD5_DIGEST_LENGTH)
252			break;
253			if (ibuf_add(buf, le->le_lsa, sizeof(struct lsa_hdr)))
254			break;
255			ls_ack_list_free(iface, le);
256			cnt++;
257			}
258			if (cnt == 0) {
259			log_warnx("ls_ack_tx_timer: lost in space");
260			ibuf_free(buf);
261			return;
262			}
263
264			/* send LS ack(s) but first set correct destination */
265			switch (iface->type) {
266			case IF_TYPE_POINTOPOINT:
267			inet_aton(AllSPFRouters, &addr);
268			send_ls_ack(iface, addr, buf);
269			break;
270			case IF_TYPE_BROADCAST:
271			if (iface->state & IF_STA_DRORBDR)
272			inet_aton(AllSPFRouters, &addr);
273			else
274			inet_aton(AllDRouters, &addr);
275			send_ls_ack(iface, addr, buf);
276			break;
277			case IF_TYPE_NBMA:
278			case IF_TYPE_POINTOMULTIPOINT:
279			case IF_TYPE_VIRTUALLINK:
280			LIST_FOREACH(nbr, &iface->nbr_list, entry) {
281			if (nbr == iface->self)
282			continue;
283			if (!(nbr->state & NBR_STA_FLOOD))
284			continue;
285			send_ls_ack(iface, nbr->addr, buf);
286			}
287			break;
288			default:
289			fatalx("lsa_ack_tx_timer: unknown interface type");
290			}
291			ibuf_free(buf);
292			}
293			}
294
295			void
296			start_ls_ack_tx_timer(struct iface *iface)
297			{
298			struct timeval tv;
299
300			timerclear(&tv);
301			tv.tv_sec = iface->rxmt_interval / 2;
302
303			if (evtimer_add(&iface->lsack_tx_timer, &tv) == -1)
304			fatal("start_ls_ack_tx_timer");
305			}
306
307			void
308			start_ls_ack_tx_timer_now(struct iface *iface)
309			{
310			struct timeval tv;
311
312			timerclear(&tv);
313			if (evtimer_add(&iface->lsack_tx_timer, &tv) == -1)
314			fatal("start_ls_ack_tx_timer_now");
315			}
316
317			void
318			stop_ls_ack_tx_timer(struct iface *iface)
319			{
320			if (evtimer_del(&iface->lsack_tx_timer) == -1)
321			fatal("stop_ls_ack_tx_timer");
322			}