1/*	$KAME: rtsock.c,v 1.3 2000/10/10 08:46:45 itojun Exp $	*/
2/*	$FreeBSD: releng/11.0/usr.sbin/rtsold/rtsock.c 254462 2013-08-17 19:23:35Z hrs $	*/
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(u_long)) \
64		       : sizeof(u_long)))
65
66#ifdef RTM_IFANNOUNCE	/*NetBSD 1.5 or later*/
67static int rtsock_input_ifannounce(int, struct rt_msghdr *, char *);
68#endif
69
70static struct {
71	u_char type;
72	size_t minlen;
73	int (*func)(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, 0, NULL },
80};
81
82int
83rtsock_open(void)
84{
85
86	return (socket(PF_ROUTE, SOCK_RAW, 0));
87}
88
89int
90rtsock_input(int s)
91{
92	ssize_t n;
93	char msg[2048];
94	char *lim, *next;
95	struct rt_msghdr *rtm;
96	int idx;
97	ssize_t len;
98	int ret = 0;
99	const ssize_t lenlim =
100	    offsetof(struct rt_msghdr, rtm_msglen) + sizeof(rtm->rtm_msglen);
101
102	n = read(s, msg, sizeof(msg));
103
104	lim = msg + n;
105	for (next = msg; next < lim; next += len) {
106		rtm = (struct rt_msghdr *)(void *)next;
107		if (lim - next < lenlim)
108			break;
109		len = rtm->rtm_msglen;
110		if (len < lenlim)
111			break;
112
113		if (dflag > 1) {
114			warnmsg(LOG_INFO, __func__,
115			    "rtmsg type %d, len=%lu", rtm->rtm_type,
116			    (u_long)len);
117		}
118
119		for (idx = 0; rtsock_dispatch[idx].func; idx++) {
120			if (rtm->rtm_type != rtsock_dispatch[idx].type)
121				continue;
122			if (rtm->rtm_msglen < rtsock_dispatch[idx].minlen) {
123				warnmsg(LOG_INFO, __func__,
124				    "rtmsg type %d too short!", rtm->rtm_type);
125				continue;
126			}
127
128			ret = (*rtsock_dispatch[idx].func)(s, rtm, lim);
129			break;
130		}
131	}
132
133	return (ret);
134}
135
136#ifdef RTM_IFANNOUNCE	/*NetBSD 1.5 or later*/
137static int
138rtsock_input_ifannounce(int s __unused, struct rt_msghdr *rtm, char *lim)
139{
140	struct if_announcemsghdr *ifan;
141	struct ifinfo *ifi;
142
143	ifan = (struct if_announcemsghdr *)rtm;
144	if ((char *)(ifan + 1) > lim)
145		return (-1);
146
147	switch (ifan->ifan_what) {
148	case IFAN_ARRIVAL:
149		/*
150		 * XXX for NetBSD 1.5, interface index will monotonically be
151		 * increased as new pcmcia card gets inserted.
152		 * we may be able to do a name-based interface match,
153		 * and call ifreconfig() to enable the interface again.
154		 */
155		warnmsg(LOG_INFO, __func__,
156		    "interface %s inserted", ifan->ifan_name);
157		break;
158	case IFAN_DEPARTURE:
159		warnmsg(LOG_WARNING, __func__,
160		    "interface %s removed", ifan->ifan_name);
161		ifi = find_ifinfo(ifan->ifan_index);
162		if (ifi) {
163			if (dflag > 1) {
164				warnmsg(LOG_INFO, __func__,
165				    "bring interface %s to DOWN state",
166				    ifan->ifan_name);
167			}
168			ifi->state = IFS_DOWN;
169		}
170		break;
171	}
172
173	return (0);
174}
175#endif
176