2 * Copyright (c) 1984, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Geoffrey M. Rehmet, All rights reserved.
7 * This code is derived from software which forms part of the 4.4-Lite
8 * Berkeley software distribution, which was in derived from software
9 * contributed to Berkeley by Sun Microsystems, Inc.
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12 * modification, are permitted provided that the following conditions
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15 * notice, this list of conditions and the following disclaimer.
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19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgement:
21 * This product includes software developed by the University of
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24 * may be used to endorse or promote products derived from this software
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41 * from arp.c 8.2 (Berkeley) 1/2/94
42 * $FreeBSD: src/libexec/bootpd/rtmsg.c,v 1.10 1999/08/28 00:09:19 peter Exp $
43 * $DragonFly: src/libexec/bootpd/rtmsg.c,v 1.3 2003/11/14 03:54:29 dillon Exp $
46 #include <sys/param.h>
48 * Verify that we are at least 4.4 BSD
53 #include <sys/socket.h>
54 #include <sys/filio.h>
58 #include <net/if_dl.h>
59 #include <net/if_types.h>
60 #include <net/route.h>
62 #include <netinet/in.h>
63 #include <netinet/if_ether.h>
65 #include <arpa/inet.h>
76 static int rtmsg (int);
78 static int s = -1; /* routing socket */
82 * Open the routing socket
84 static void getsocket () {
86 s = socket(PF_ROUTE, SOCK_RAW, 0);
88 report(LOG_ERR, "socket %s", strerror(errno));
93 * Drain the socket of any unwanted routing messages.
98 ioctl(s, FIONREAD, &n);
100 read(s, buf, sizeof buf);
101 ioctl(s, FIONREAD, &n);
106 static struct sockaddr_in so_mask = {8, 0, 0, { 0xffffffff}};
107 static struct sockaddr_inarp blank_sin = {sizeof(blank_sin), AF_INET }, sin_m;
108 static struct sockaddr_dl blank_sdl = {sizeof(blank_sdl), AF_LINK }, sdl_m;
109 static int expire_time, flags, export_only, doing_proxy;
111 struct rt_msghdr m_rtm;
116 * Set an individual arp entry
118 int bsd_arp_set(ia, eaddr, len)
123 register struct sockaddr_inarp *sin = &sin_m;
124 register struct sockaddr_dl *sdl;
125 register struct rt_msghdr *rtm = &(m_rtmsg.m_rtm);
135 ea = (u_char *)LLADDR(&sdl_m);
136 bcopy(eaddr, ea, len);
137 sdl_m.sdl_alen = len;
138 doing_proxy = flags = export_only = expire_time = 0;
140 /* make arp entry temporary */
141 gettimeofday(&time, 0);
142 expire_time = time.tv_sec + 20 * 60;
145 if (rtmsg(RTM_GET) < 0) {
146 report(LOG_WARNING, "rtmget: %s", strerror(errno));
149 sin = (struct sockaddr_inarp *)(rtm + 1);
150 sdl = (struct sockaddr_dl *)(sin->sin_len + (char *)sin);
151 if (sin->sin_addr.s_addr == sin_m.sin_addr.s_addr) {
152 if (sdl->sdl_family == AF_LINK &&
153 (rtm->rtm_flags & RTF_LLINFO) &&
154 !(rtm->rtm_flags & RTF_GATEWAY)) switch (sdl->sdl_type) {
155 case IFT_ETHER: case IFT_FDDI: case IFT_ISO88023:
156 case IFT_ISO88024: case IFT_ISO88025:
160 if (doing_proxy == 0) {
161 report(LOG_WARNING, "set: can only proxy for %s\n",
162 inet_ntoa(sin->sin_addr));
165 if (sin_m.sin_other & SIN_PROXY) {
167 "set: proxy entry exists for non 802 device\n");
170 sin_m.sin_other = SIN_PROXY;
175 if (sdl->sdl_family != AF_LINK) {
177 "cannot intuit interface index and type for %s\n",
178 inet_ntoa(sin->sin_addr));
181 sdl_m.sdl_type = sdl->sdl_type;
182 sdl_m.sdl_index = sdl->sdl_index;
187 static int rtmsg(cmd)
192 register struct rt_msghdr *rtm = &m_rtmsg.m_rtm;
193 register char *cp = m_rtmsg.m_space;
197 bzero((char *)&m_rtmsg, sizeof(m_rtmsg));
198 rtm->rtm_flags = flags;
199 rtm->rtm_version = RTM_VERSION;
203 report(LOG_ERR, "set_arp: internal wrong cmd - exiting");
207 rtm->rtm_addrs |= RTA_GATEWAY;
208 rtm->rtm_rmx.rmx_expire = expire_time;
209 rtm->rtm_inits = RTV_EXPIRE;
210 rtm->rtm_flags |= (RTF_HOST | RTF_STATIC);
214 sin_m.sin_other = SIN_PROXY;
216 rtm->rtm_addrs |= RTA_NETMASK;
217 rtm->rtm_flags &= ~RTF_HOST;
222 rtm->rtm_addrs |= RTA_DST;
224 #define NEXTADDR(w, s) \
225 if (rtm->rtm_addrs & (w)) { \
226 bcopy((char *)&s, cp, sizeof(s)); cp += sizeof(s);}
228 NEXTADDR(RTA_DST, sin_m);
229 NEXTADDR(RTA_GATEWAY, sdl_m);
230 NEXTADDR(RTA_NETMASK, so_mask);
232 rtm->rtm_msglen = cp - (char *)&m_rtmsg;
235 rtm->rtm_seq = ++seq;
237 if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
238 if ((errno != ESRCH) && !(errno == EEXIST && cmd == RTM_ADD)){
239 report(LOG_WARNING, "writing to routing socket: %s",
245 l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
246 } while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != getpid()));
248 report(LOG_WARNING, "arp: read from routing socket: %s\n",
254 #endif /* BSD >= 199306 */