1/*	$KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $	*/
2/*	$FreeBSD$	*/
3
4/*-
5 * SPDX-License-Identifier: BSD-3-Clause
6 *
7 * Copyright (C) 2000 WIDE Project.
8 * All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the project nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/param.h>
36#include <sys/capsicum.h>
37#include <sys/queue.h>
38#include <sys/socket.h>
39#include <sys/time.h>
40#include <sys/uio.h>
41
42#include <net/if.h>
43#include <net/route.h>
44#include <net/if_dl.h>
45
46#include <netinet/in.h>
47#include <netinet/ip6.h>
48#include <netinet/icmp6.h>
49
50#include <capsicum_helpers.h>
51#include <time.h>
52#include <unistd.h>
53#include <stdio.h>
54#include <stddef.h>
55#include <err.h>
56#include <errno.h>
57#include <string.h>
58#include <stdlib.h>
59#include <syslog.h>
60#include "rtsold.h"
61
62static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *);
63
64static struct {
65	u_char type;
66	size_t minlen;
67	int (*func)(int, struct rt_msghdr *, char *);
68} rtsock_dispatch[] = {
69	{ RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
70	  rtsock_input_ifannounce },
71	{ 0, 0, NULL },
72};
73
74int
75rtsock_open(void)
76{
77	cap_rights_t rights;
78	int error, s;
79
80	s = socket(PF_ROUTE, SOCK_RAW, 0);
81	if (s < 0)
82		return (s);
83	cap_rights_init(&rights, CAP_EVENT, CAP_READ);
84	if (caph_rights_limit(s, &rights) != 0) {
85		error = errno;
86		(void)close(s);
87		errno = errno;
88		return (-1);
89	}
90	return (s);
91}
92
93int
94rtsock_input(int s)
95{
96	ssize_t n;
97	char msg[2048];
98	char *lim, *next;
99	struct rt_msghdr *rtm;
100	int idx;
101	ssize_t len;
102	int ret = 0;
103	const ssize_t lenlim =
104	    offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
105
106	n = read(s, msg, sizeof(msg));
107
108	lim = msg + n;
109	for (next = msg; next < lim; next += len) {
110		rtm = (struct rt_msghdr *)(void *)next;
111		if (lim - next < lenlim)
112			break;
113		len = rtm->rtm_msglen;
114		if (len < lenlim)
115			break;
116
117		if (dflag > 1) {
118			warnmsg(LOG_INFO, __func__,
119			    "rtmsg type %d, len=%lu", rtm->rtm_type,
120			    (u_long)len);
121		}
122
123		for (idx = 0; rtsock_dispatch[idx].func; idx++) {
124			if (rtm->rtm_type != rtsock_dispatch[idx].type)
125				continue;
126			if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
127				warnmsg(LOG_INFO, __func__,
128				    "rtmsg type %d too short!", rtm->rtm_type);
129				continue;
130			}
131
132			ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
133			break;
134		}
135	}
136
137	return (ret);
138}
139
140static int
141rtsock_input_ifannounce(int s __unused, struct rt_msghdr *rtm, char *lim)
142{
143	struct if_announcemsghdr *ifan;
144	struct ifinfo *ifi;
145
146	ifan = (struct if_announcemsghdr *)rtm;
147	if ((char *)(ifan + 1) > lim)
148		return (-1);
149
150	switch (ifan->ifan_what) {
151	case IFAN_ARRIVAL:
152		/*
153		 * XXX for NetBSD 1.5, interface index will monotonically be
154		 * increased as new pcmcia card gets inserted.
155		 * we may be able to do a name-based interface match,
156		 * and call ifreconfig() to enable the interface again.
157		 */
158		warnmsg(LOG_INFO, __func__,
159		    "interface %s inserted", ifan->ifan_name);
160		break;
161	case IFAN_DEPARTURE:
162		warnmsg(LOG_WARNING, __func__,
163		    "interface %s removed", ifan->ifan_name);
164		ifi = find_ifinfo(ifan->ifan_index);
165		if (ifi) {
166			if (dflag > 1) {
167				warnmsg(LOG_INFO, __func__,
168				    "bring interface %s to DOWN state",
169				    ifan->ifan_name);
170			}
171			ifi->state = IFS_DOWN;
172		}
173		break;
174	}
175
176	return (0);
177}
178