1/*	$KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $	*/
2/*	$FreeBSD: src/usr.sbin/rtsold/rtsock.c,v 1.1.2.1 2001/07/03 11:02:16 ume Exp $	*/
3
4/*
5 * Copyright (C) 2000 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/param.h>
34#include <sys/socket.h>
35#include <sys/uio.h>
36#include <sys/time.h>
37#include <sys/queue.h>
38
39#include <net/if.h>
40#include <net/route.h>
41#include <net/if_dl.h>
42
43#include <netinet/in.h>
44#include <netinet/ip6.h>
45#include <netinet/icmp6.h>
46
47#include <time.h>
48#include <unistd.h>
49#include <stdio.h>
50#include <stddef.h>
51#include <err.h>
52#include <errno.h>
53#include <string.h>
54#include <stdlib.h>
55#include <syslog.h>
56#include "rtsold.h"
57
58#define ROUNDUP(a, size) \
59	(((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a))
60
61#define NEXT_SA(ap) (ap) = (struct sockaddr *) \
62	((caddr_t)(ap) + \
63	 ((ap)->sa_len ? ROUNDUP((ap)->sa_len, sizeof(uint32_t)) \
64		       : sizeof(uint32_t)))
65
66#ifdef RTM_IFANNOUNCE	/*NetBSD 1.5 or later*/
67static int rtsock_input_ifannounce __P((int, struct rt_msghdr *, char *));
68#endif
69
70static struct {
71	u_char type;
72	size_t minlen;
73	int (*func) __P((int, struct rt_msghdr *, char *));
74} rtsock_dispatch[] = {
75#ifdef RTM_IFANNOUNCE	/*NetBSD 1.5 or later*/
76	{ RTM_IFANNOUNCE, sizeof(struct if_announcemsghdr),
77	  rtsock_input_ifannounce },
78#endif
79	{ 0, 0UL, NULL },
80};
81
82int
83rtsock_open()
84{
85
86	return socket(PF_ROUTE, SOCK_RAW, 0);
87}
88
89int
90rtsock_input(s)
91	int s;
92{
93	ssize_t n;
94	char msg[2048];
95	char *lim, *next;
96	struct rt_msghdr *rtm;
97	int idx;
98	size_t len;
99	int ret = 0;
100	const size_t lenlim =
101	    offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
102
103	n = read(s, msg, sizeof(msg));
104
105	lim = msg + n;
106	for (next = msg; next < lim; next += len) {
107		rtm = (struct rt_msghdr *)next;
108		if (lim - next < lenlim)
109			break;
110		len = rtm->rtm_msglen;
111		if (len < lenlim)
112			break;
113
114		if (dflag > 1) {
115			warnmsg(LOG_INFO, __FUNCTION__,
116			    "rtmsg type %d, len=%lu", rtm->rtm_type,
117			    (u_long)len);
118		}
119
120		for (idx = 0; rtsock_dispatch[idx].func; idx++) {
121			if (rtm->rtm_type != rtsock_dispatch[idx].type)
122				continue;
123			if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
124				warnmsg(LOG_INFO, __FUNCTION__,
125				    "rtmsg type %d too short!", rtm->rtm_type);
126				continue;
127			}
128
129			ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
130			break;
131		}
132	}
133
134	return ret;
135}
136
137#ifdef RTM_IFANNOUNCE	/*NetBSD 1.5 or later*/
138static int
139rtsock_input_ifannounce(s, rtm, lim)
140	int s;
141	struct rt_msghdr *rtm;
142	char *lim;
143{
144	struct if_announcemsghdr *ifan;
145	struct ifinfo *ifinfo;
146
147	ifan = (struct if_announcemsghdr *)rtm;
148	if ((char *)(ifan + 1) > lim)
149		return -1;
150
151	switch (ifan->ifan_what) {
152	case IFAN_ARRIVAL:
153		/*
154		 * XXX for NetBSD 1.5, interface index will monotonically be
155		 * increased as new pcmcia card gets inserted.
156		 * we may be able to do a name-based interface match,
157		 * and call ifreconfig() to enable the interface again.
158		 */
159		warnmsg(LOG_INFO, __FUNCTION__,
160		    "interface %s inserted", ifan->ifan_name);
161		break;
162	case IFAN_DEPARTURE:
163		warnmsg(LOG_WARNING, __FUNCTION__,
164		    "interface %s removed", ifan->ifan_name);
165		ifinfo = find_ifinfo(ifan->ifan_index);
166		if (ifinfo) {
167			if (dflag > 1) {
168				warnmsg(LOG_INFO, __FUNCTION__,
169				    "bring interface %s to DOWN state",
170				    ifan->ifan_name);
171			}
172			ifinfo->state = IFS_DOWN;
173		}
174		break;
175	}
176
177	return 0;
178}
179#endif
180