1/*
2 * sys-bsd.c - System-dependent procedures for setting up
3 * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
4 *
5 * Copyright (c) 1989 Carnegie Mellon University.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
| 1/*
2 * sys-bsd.c - System-dependent procedures for setting up
3 * PPP interfaces on bsd-4.4-ish systems (including 386BSD, NetBSD, etc.)
4 *
5 * Copyright (c) 1989 Carnegie Mellon University.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms are permitted
9 * provided that the above copyright notice and this paragraph are
10 * duplicated in all such forms and that any documentation,
11 * advertising materials, and other materials related to such
12 * distribution and use acknowledge that the software was developed
13 * by Carnegie Mellon University. The name of the
14 * University may not be used to endorse or promote products derived
15 * from this software without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
19 *
|
20 * $Id: arp.c,v 1.12 1997/06/09 03:27:11 brian Exp $
| 20 * $Id: arp.c,v 1.13 1997/08/25 00:29:03 brian Exp $
|
21 *
22 */
23
24/*
25 * TODO:
26 */
27
28#include <sys/ioctl.h>
29#include <sys/types.h>
30#include <sys/uio.h>
31#include <sys/socket.h>
32#include <sys/time.h>
33#include <sys/errno.h>
34#include <unistd.h>
35#include <string.h>
36
37#include <net/if.h>
38#include <net/if_var.h>
39#include <net/route.h>
40#include <net/if_dl.h>
41#include <netinet/in.h>
42#include <stdio.h>
43#include <fcntl.h>
44#ifdef __bsdi__
45#include <kvm.h>
46#endif
47#include <net/if_types.h>
48#include <netinet/in_var.h>
49#include <netinet/if_ether.h>
50#include "log.h"
51
52#if RTM_VERSION >= 3
53#include <netinet/if_ether.h>
54#endif
55
56static int rtm_seq;
57
58static int get_ether_addr(int, u_long, struct sockaddr_dl *);
59
60#define BCOPY(s, d, l) memcpy(d, s, l)
61#define BZERO(s, n) memset(s, 0, n)
62/*
63 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
64 * if it exists.
65 */
66#define SET_SA_FAMILY(addr, family) \
67 BZERO((char *) &(addr), sizeof(addr)); \
68 addr.sa_family = (family); \
69 addr.sa_len = sizeof(addr);
70
71
72#if RTM_VERSION >= 3
73
74/*
75 * sifproxyarp - Make a proxy ARP entry for the peer.
76 */
77static struct {
78 struct rt_msghdr hdr;
79 struct sockaddr_inarp dst;
80 struct sockaddr_dl hwa;
81 char extra[128];
82} arpmsg;
83
84static int arpmsg_valid;
85
86int
87sifproxyarp(int unit, u_long hisaddr)
88{
89 int routes;
90
91 /*
92 * Get the hardware address of an interface on the same subnet as our local
93 * address.
94 */
95 memset(&arpmsg, 0, sizeof(arpmsg));
96 if (!get_ether_addr(unit, hisaddr, &arpmsg.hwa)) {
| 21 *
22 */
23
24/*
25 * TODO:
26 */
27
28#include <sys/ioctl.h>
29#include <sys/types.h>
30#include <sys/uio.h>
31#include <sys/socket.h>
32#include <sys/time.h>
33#include <sys/errno.h>
34#include <unistd.h>
35#include <string.h>
36
37#include <net/if.h>
38#include <net/if_var.h>
39#include <net/route.h>
40#include <net/if_dl.h>
41#include <netinet/in.h>
42#include <stdio.h>
43#include <fcntl.h>
44#ifdef __bsdi__
45#include <kvm.h>
46#endif
47#include <net/if_types.h>
48#include <netinet/in_var.h>
49#include <netinet/if_ether.h>
50#include "log.h"
51
52#if RTM_VERSION >= 3
53#include <netinet/if_ether.h>
54#endif
55
56static int rtm_seq;
57
58static int get_ether_addr(int, u_long, struct sockaddr_dl *);
59
60#define BCOPY(s, d, l) memcpy(d, s, l)
61#define BZERO(s, n) memset(s, 0, n)
62/*
63 * SET_SA_FAMILY - set the sa_family field of a struct sockaddr,
64 * if it exists.
65 */
66#define SET_SA_FAMILY(addr, family) \
67 BZERO((char *) &(addr), sizeof(addr)); \
68 addr.sa_family = (family); \
69 addr.sa_len = sizeof(addr);
70
71
72#if RTM_VERSION >= 3
73
74/*
75 * sifproxyarp - Make a proxy ARP entry for the peer.
76 */
77static struct {
78 struct rt_msghdr hdr;
79 struct sockaddr_inarp dst;
80 struct sockaddr_dl hwa;
81 char extra[128];
82} arpmsg;
83
84static int arpmsg_valid;
85
86int
87sifproxyarp(int unit, u_long hisaddr)
88{
89 int routes;
90
91 /*
92 * Get the hardware address of an interface on the same subnet as our local
93 * address.
94 */
95 memset(&arpmsg, 0, sizeof(arpmsg));
96 if (!get_ether_addr(unit, hisaddr, &arpmsg.hwa)) {
|
97 LogPrintf(LogERROR, "Cannot determine ethernet address"
98 " for proxy ARP\n");
| 97 LogPrintf(LogERROR, "Cannot determine ethernet address for proxy ARP\n");
|
99 return 0;
100 }
101 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
102 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
103 strerror(errno));
104 return 0;
105 }
106 arpmsg.hdr.rtm_type = RTM_ADD;
107 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
108 arpmsg.hdr.rtm_version = RTM_VERSION;
109 arpmsg.hdr.rtm_seq = ++rtm_seq;
110 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
111 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
112 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
113 arpmsg.dst.sin_family = AF_INET;
114 arpmsg.dst.sin_addr.s_addr = hisaddr;
115 arpmsg.dst.sin_other = SIN_PROXY;
116
117 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
118 + arpmsg.hwa.sdl_len;
119 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
120 LogPrintf(LogERROR, "Add proxy arp entry: %s\n", strerror(errno));
121 close(routes);
122 return 0;
123 }
124 close(routes);
125 arpmsg_valid = 1;
126 return 1;
127}
128
129/*
130 * cifproxyarp - Delete the proxy ARP entry for the peer.
131 */
132int
133cifproxyarp(int unit, u_long hisaddr)
134{
135 int routes;
136
137 if (!arpmsg_valid)
138 return 0;
139 arpmsg_valid = 0;
140
141 arpmsg.hdr.rtm_type = RTM_DELETE;
142 arpmsg.hdr.rtm_seq = ++rtm_seq;
143
144 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
145 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
146 strerror(errno));
147 return 0;
148 }
149 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
150 LogPrintf(LogERROR, "Delete proxy arp entry: %s\n", strerror(errno));
151 close(routes);
152 return 0;
153 }
154 close(routes);
155 return 1;
156}
157
158#else /* RTM_VERSION */
159
160/*
161 * sifproxyarp - Make a proxy ARP entry for the peer.
162 */
163int
164sifproxyarp(int unit, u_long hisaddr)
165{
166 struct arpreq arpreq;
167 struct {
168 struct sockaddr_dl sdl;
169 char space[128];
170 } dls;
171
172 BZERO(&arpreq, sizeof(arpreq));
173
174 /*
175 * Get the hardware address of an interface on the same subnet as our local
176 * address.
177 */
178 if (!get_ether_addr(unit, hisaddr, &dls.sdl)) {
179 LogPrintf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
180 return 0;
181 }
182 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
183 arpreq.arp_ha.sa_family = AF_UNSPEC;
184 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
185 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
186 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
187 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
188 if (ioctl(unit, SIOCSARP, (caddr_t) & arpreq) < 0) {
| 98 return 0;
99 }
100 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
101 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
102 strerror(errno));
103 return 0;
104 }
105 arpmsg.hdr.rtm_type = RTM_ADD;
106 arpmsg.hdr.rtm_flags = RTF_ANNOUNCE | RTF_HOST | RTF_STATIC;
107 arpmsg.hdr.rtm_version = RTM_VERSION;
108 arpmsg.hdr.rtm_seq = ++rtm_seq;
109 arpmsg.hdr.rtm_addrs = RTA_DST | RTA_GATEWAY;
110 arpmsg.hdr.rtm_inits = RTV_EXPIRE;
111 arpmsg.dst.sin_len = sizeof(struct sockaddr_inarp);
112 arpmsg.dst.sin_family = AF_INET;
113 arpmsg.dst.sin_addr.s_addr = hisaddr;
114 arpmsg.dst.sin_other = SIN_PROXY;
115
116 arpmsg.hdr.rtm_msglen = (char *) &arpmsg.hwa - (char *) &arpmsg
117 + arpmsg.hwa.sdl_len;
118 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
119 LogPrintf(LogERROR, "Add proxy arp entry: %s\n", strerror(errno));
120 close(routes);
121 return 0;
122 }
123 close(routes);
124 arpmsg_valid = 1;
125 return 1;
126}
127
128/*
129 * cifproxyarp - Delete the proxy ARP entry for the peer.
130 */
131int
132cifproxyarp(int unit, u_long hisaddr)
133{
134 int routes;
135
136 if (!arpmsg_valid)
137 return 0;
138 arpmsg_valid = 0;
139
140 arpmsg.hdr.rtm_type = RTM_DELETE;
141 arpmsg.hdr.rtm_seq = ++rtm_seq;
142
143 if ((routes = socket(PF_ROUTE, SOCK_RAW, AF_INET)) < 0) {
144 LogPrintf(LogERROR, "sifproxyarp: opening routing socket: %s\n",
145 strerror(errno));
146 return 0;
147 }
148 if (write(routes, &arpmsg, arpmsg.hdr.rtm_msglen) < 0) {
149 LogPrintf(LogERROR, "Delete proxy arp entry: %s\n", strerror(errno));
150 close(routes);
151 return 0;
152 }
153 close(routes);
154 return 1;
155}
156
157#else /* RTM_VERSION */
158
159/*
160 * sifproxyarp - Make a proxy ARP entry for the peer.
161 */
162int
163sifproxyarp(int unit, u_long hisaddr)
164{
165 struct arpreq arpreq;
166 struct {
167 struct sockaddr_dl sdl;
168 char space[128];
169 } dls;
170
171 BZERO(&arpreq, sizeof(arpreq));
172
173 /*
174 * Get the hardware address of an interface on the same subnet as our local
175 * address.
176 */
177 if (!get_ether_addr(unit, hisaddr, &dls.sdl)) {
178 LogPrintf(LOG_PHASE_BIT, "Cannot determine ethernet address for proxy ARP\n");
179 return 0;
180 }
181 arpreq.arp_ha.sa_len = sizeof(struct sockaddr);
182 arpreq.arp_ha.sa_family = AF_UNSPEC;
183 BCOPY(LLADDR(&dls.sdl), arpreq.arp_ha.sa_data, dls.sdl.sdl_alen);
184 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
185 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
186 arpreq.arp_flags = ATF_PERM | ATF_PUBL;
187 if (ioctl(unit, SIOCSARP, (caddr_t) & arpreq) < 0) {
|
189 LogPrintf(LogERROR, "sifproxyarp: ioctl(SIOCSARP): \n");
| 188 LogPrintf(LogERROR, "sifproxyarp: ioctl(SIOCSARP): %s\n", strerror(errno));
|
190 return 0;
191 }
192 return 1;
193}
194
195/*
196 * cifproxyarp - Delete the proxy ARP entry for the peer.
197 */
198int
199cifproxyarp(int unit, u_long hisaddr)
200{
201 struct arpreq arpreq;
202
203 BZERO(&arpreq, sizeof(arpreq));
204 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
205 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
206 if (ioctl(unit, SIOCDARP, (caddr_t) & arpreq) < 0) {
| 189 return 0;
190 }
191 return 1;
192}
193
194/*
195 * cifproxyarp - Delete the proxy ARP entry for the peer.
196 */
197int
198cifproxyarp(int unit, u_long hisaddr)
199{
200 struct arpreq arpreq;
201
202 BZERO(&arpreq, sizeof(arpreq));
203 SET_SA_FAMILY(arpreq.arp_pa, AF_INET);
204 ((struct sockaddr_in *) & arpreq.arp_pa)->sin_addr.s_addr = hisaddr;
205 if (ioctl(unit, SIOCDARP, (caddr_t) & arpreq) < 0) {
|
207 LogPrintf(LogERROR, "cifproxyarp: ioctl(SIOCDARP): \n");
| 206 LogPrintf(LogERROR, "cifproxyarp: ioctl(SIOCDARP): %s\n", strerror(errno));
|
208 return 0;
209 }
210 return 1;
211}
212
213#endif /* RTM_VERSION */
214
215
216/*
217 * get_ether_addr - get the hardware address of an interface on the
218 * the same subnet as ipaddr.
219 */
220#define MAX_IFS 32
221
222int
223get_ether_addr(int s, u_long ipaddr, struct sockaddr_dl * hwaddr)
224{
225 struct ifreq *ifr, *ifend, *ifp;
226 u_long ina, mask;
227 struct sockaddr_dl *dla;
228 struct ifreq ifreq;
229 struct ifconf ifc;
230 struct ifreq ifs[MAX_IFS];
231
232 ifc.ifc_len = sizeof(ifs);
233 ifc.ifc_req = ifs;
234 if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
| 207 return 0;
208 }
209 return 1;
210}
211
212#endif /* RTM_VERSION */
213
214
215/*
216 * get_ether_addr - get the hardware address of an interface on the
217 * the same subnet as ipaddr.
218 */
219#define MAX_IFS 32
220
221int
222get_ether_addr(int s, u_long ipaddr, struct sockaddr_dl * hwaddr)
223{
224 struct ifreq *ifr, *ifend, *ifp;
225 u_long ina, mask;
226 struct sockaddr_dl *dla;
227 struct ifreq ifreq;
228 struct ifconf ifc;
229 struct ifreq ifs[MAX_IFS];
230
231 ifc.ifc_len = sizeof(ifs);
232 ifc.ifc_req = ifs;
233 if (ioctl(s, SIOCGIFCONF, &ifc) < 0) {
|
235 LogPrintf(LogERROR, "get_ether_addr: ioctl(SIOCGIFCONF): \n");
| 234 LogPrintf(LogERROR, "get_ether_addr: ioctl(SIOCGIFCONF): %s\n",
235 strerror(errno));
|
236 return 0;
237 }
238
239 /*
240 * Scan through looking for an interface with an Internet address on the
241 * same subnet as `ipaddr'.
242 */
243 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
244 for (ifr = ifc.ifc_req; ifr < ifend;) {
245 if (ifr->ifr_addr.sa_family == AF_INET) {
246 ina = ((struct sockaddr_in *) & ifr->ifr_addr)->sin_addr.s_addr;
247 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
248 ifreq.ifr_name[sizeof(ifreq.ifr_name) - 1] = '\0';
249
250 /*
251 * Check that the interface is up, and not point-to-point or loopback.
252 */
253 if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
254 continue;
255 if ((ifreq.ifr_flags &
256 (IFF_UP | IFF_BROADCAST | IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP))
257 != (IFF_UP | IFF_BROADCAST))
258 goto nextif;
259
260 /*
261 * Get its netmask and check that it's on the right subnet.
262 */
263 if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
264 continue;
265 mask = ((struct sockaddr_in *) & ifreq.ifr_addr)->sin_addr.s_addr;
266 if ((ipaddr & mask) != (ina & mask))
267 goto nextif;
268
269 break;
270 }
271nextif:
272 ifr = (struct ifreq *) ((char *) &ifr->ifr_addr + ifr->ifr_addr.sa_len);
273 }
274
275 if (ifr >= ifend)
276 return 0;
277 LogPrintf(LogPHASE, "Found interface %s for proxy arp\n", ifr->ifr_name);
278
279 /*
280 * Now scan through again looking for a link-level address for this
281 * interface.
282 */
283 ifp = ifr;
284 for (ifr = ifc.ifc_req; ifr < ifend;) {
285 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
286 && ifr->ifr_addr.sa_family == AF_LINK) {
287
288 /*
289 * Found the link-level address - copy it out
290 */
291 dla = (struct sockaddr_dl *) & ifr->ifr_addr;
292#ifdef __bsdi__
293 if (dla->sdl_alen == 0)
294 kmemgetether(ifr->ifr_name, dla);
295#endif
296 BCOPY(dla, hwaddr, dla->sdl_len);
297 return 1;
298 }
299 ifr = (struct ifreq *) ((char *) &ifr->ifr_addr + ifr->ifr_addr.sa_len);
300 }
301
302 return 0;
303}
304
305#ifdef __bsdi__
306#include <nlist.h>
307
308struct nlist nl[] = {
309#define N_IFNET 0
310 {"_ifnet"},
311 "",
312};
313
314
315kvm_t *kvmd;
316
317/*
318 * Read kernel memory, return 0 on success.
319 */
320int
321kread(u_long addr, char *buf, int size)
322{
323 if (kvm_read(kvmd, addr, buf, size) != size) {
324 /* XXX this duplicates kvm_read's error printout */
325 LogPrintf(LogERROR, "kvm_read %s\n", kvm_geterr(kvmd));
326 return -1;
327 }
328 return 0;
329}
330
331void
332kmemgetether(char *ifname, struct sockaddr_dl * dlo)
333{
334 struct ifnet ifnet;
335 int n;
336 u_long addr, ifaddraddr, ifnetfound, ifaddrfound;
337 char name[16 + 32];
338 struct sockaddr *sa;
339 char *cp;
340 struct sockaddr_dl *sdl;
341 union {
342 struct ifaddr ifa;
343 struct in_ifaddr in;
344 } ifaddr;
345 struct arpcom ac;
346
347 kvmd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
348 if (kvmd) {
349 n = kvm_nlist(kvmd, nl);
350 if (n >= 0) {
351 addr = nl[N_IFNET].n_value;
352 kread(addr, (char *) &addr, sizeof(addr));
353 ifaddraddr = ifnetfound = 0;
354 while (addr || ifaddraddr) {
355 ifnetfound = addr;
356 if (ifaddraddr == 0) {
357 if (kread(addr, (char *) &ifnet, sizeof(ifnet)) ||
358 kread((u_long) ifnet.if_name, name, 16))
359 return;
360 name[15] = 0;
361 addr = (u_long) ifnet.if_next;
362 cp = (char *) index(name, '\0');
363 cp += sprintf(cp, "%d", ifnet.if_unit);
364 *cp = '\0';
365 ifaddraddr = (u_long) ifnet.if_addrlist;
366 }
367 ifaddrfound = ifaddraddr;
368 if (ifaddraddr) {
369 if (kread(ifaddraddr, (char *) &ifaddr, sizeof ifaddr)) {
370 ifaddraddr = 0;
371 continue;
372 }
373#define CP(x) ((char *)(x))
374 cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) + CP(&ifaddr);
375 sa = (struct sockaddr *) cp;
376 if (sa->sa_family == AF_LINK && strcmp(ifname, name) == 0) {
377 sdl = (struct sockaddr_dl *) sa;
378 cp = (char *) LLADDR(sdl);
379 n = sdl->sdl_alen;
380 if (ifnet.if_type == IFT_ETHER) {
381 if (n == 0) {
382 kread(ifnetfound, (char *) &ac, sizeof(ac));
383 cp = (char *) LLADDR(sdl);
384 bcopy((char *) ac.ac_enaddr, cp, 6);
385 sdl->sdl_alen = 6;
386 }
387 bcopy(sdl, dlo, sizeof(*sdl));
388 return;
389 }
390 }
391 ifaddraddr = (u_long) ifaddr.ifa.ifa_next;
392 }
393 }
394 }
395 }
396}
397
398#endif
399
400#ifdef DEBUG
401main()
402{
403 u_long ipaddr;
404 int s;
405
406 s = socket(AF_INET, SOCK_DGRAM, 0);
407 ipaddr = inet_addr("192.168.1.32");
408 sifproxyarp(s, ipaddr);
409 close(s);
410}
411
412#endif
| 236 return 0;
237 }
238
239 /*
240 * Scan through looking for an interface with an Internet address on the
241 * same subnet as `ipaddr'.
242 */
243 ifend = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len);
244 for (ifr = ifc.ifc_req; ifr < ifend;) {
245 if (ifr->ifr_addr.sa_family == AF_INET) {
246 ina = ((struct sockaddr_in *) & ifr->ifr_addr)->sin_addr.s_addr;
247 strncpy(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name));
248 ifreq.ifr_name[sizeof(ifreq.ifr_name) - 1] = '\0';
249
250 /*
251 * Check that the interface is up, and not point-to-point or loopback.
252 */
253 if (ioctl(s, SIOCGIFFLAGS, &ifreq) < 0)
254 continue;
255 if ((ifreq.ifr_flags &
256 (IFF_UP | IFF_BROADCAST | IFF_POINTOPOINT | IFF_LOOPBACK | IFF_NOARP))
257 != (IFF_UP | IFF_BROADCAST))
258 goto nextif;
259
260 /*
261 * Get its netmask and check that it's on the right subnet.
262 */
263 if (ioctl(s, SIOCGIFNETMASK, &ifreq) < 0)
264 continue;
265 mask = ((struct sockaddr_in *) & ifreq.ifr_addr)->sin_addr.s_addr;
266 if ((ipaddr & mask) != (ina & mask))
267 goto nextif;
268
269 break;
270 }
271nextif:
272 ifr = (struct ifreq *) ((char *) &ifr->ifr_addr + ifr->ifr_addr.sa_len);
273 }
274
275 if (ifr >= ifend)
276 return 0;
277 LogPrintf(LogPHASE, "Found interface %s for proxy arp\n", ifr->ifr_name);
278
279 /*
280 * Now scan through again looking for a link-level address for this
281 * interface.
282 */
283 ifp = ifr;
284 for (ifr = ifc.ifc_req; ifr < ifend;) {
285 if (strcmp(ifp->ifr_name, ifr->ifr_name) == 0
286 && ifr->ifr_addr.sa_family == AF_LINK) {
287
288 /*
289 * Found the link-level address - copy it out
290 */
291 dla = (struct sockaddr_dl *) & ifr->ifr_addr;
292#ifdef __bsdi__
293 if (dla->sdl_alen == 0)
294 kmemgetether(ifr->ifr_name, dla);
295#endif
296 BCOPY(dla, hwaddr, dla->sdl_len);
297 return 1;
298 }
299 ifr = (struct ifreq *) ((char *) &ifr->ifr_addr + ifr->ifr_addr.sa_len);
300 }
301
302 return 0;
303}
304
305#ifdef __bsdi__
306#include <nlist.h>
307
308struct nlist nl[] = {
309#define N_IFNET 0
310 {"_ifnet"},
311 "",
312};
313
314
315kvm_t *kvmd;
316
317/*
318 * Read kernel memory, return 0 on success.
319 */
320int
321kread(u_long addr, char *buf, int size)
322{
323 if (kvm_read(kvmd, addr, buf, size) != size) {
324 /* XXX this duplicates kvm_read's error printout */
325 LogPrintf(LogERROR, "kvm_read %s\n", kvm_geterr(kvmd));
326 return -1;
327 }
328 return 0;
329}
330
331void
332kmemgetether(char *ifname, struct sockaddr_dl * dlo)
333{
334 struct ifnet ifnet;
335 int n;
336 u_long addr, ifaddraddr, ifnetfound, ifaddrfound;
337 char name[16 + 32];
338 struct sockaddr *sa;
339 char *cp;
340 struct sockaddr_dl *sdl;
341 union {
342 struct ifaddr ifa;
343 struct in_ifaddr in;
344 } ifaddr;
345 struct arpcom ac;
346
347 kvmd = kvm_open(NULL, NULL, NULL, O_RDONLY, NULL);
348 if (kvmd) {
349 n = kvm_nlist(kvmd, nl);
350 if (n >= 0) {
351 addr = nl[N_IFNET].n_value;
352 kread(addr, (char *) &addr, sizeof(addr));
353 ifaddraddr = ifnetfound = 0;
354 while (addr || ifaddraddr) {
355 ifnetfound = addr;
356 if (ifaddraddr == 0) {
357 if (kread(addr, (char *) &ifnet, sizeof(ifnet)) ||
358 kread((u_long) ifnet.if_name, name, 16))
359 return;
360 name[15] = 0;
361 addr = (u_long) ifnet.if_next;
362 cp = (char *) index(name, '\0');
363 cp += sprintf(cp, "%d", ifnet.if_unit);
364 *cp = '\0';
365 ifaddraddr = (u_long) ifnet.if_addrlist;
366 }
367 ifaddrfound = ifaddraddr;
368 if (ifaddraddr) {
369 if (kread(ifaddraddr, (char *) &ifaddr, sizeof ifaddr)) {
370 ifaddraddr = 0;
371 continue;
372 }
373#define CP(x) ((char *)(x))
374 cp = (CP(ifaddr.ifa.ifa_addr) - CP(ifaddraddr)) + CP(&ifaddr);
375 sa = (struct sockaddr *) cp;
376 if (sa->sa_family == AF_LINK && strcmp(ifname, name) == 0) {
377 sdl = (struct sockaddr_dl *) sa;
378 cp = (char *) LLADDR(sdl);
379 n = sdl->sdl_alen;
380 if (ifnet.if_type == IFT_ETHER) {
381 if (n == 0) {
382 kread(ifnetfound, (char *) &ac, sizeof(ac));
383 cp = (char *) LLADDR(sdl);
384 bcopy((char *) ac.ac_enaddr, cp, 6);
385 sdl->sdl_alen = 6;
386 }
387 bcopy(sdl, dlo, sizeof(*sdl));
388 return;
389 }
390 }
391 ifaddraddr = (u_long) ifaddr.ifa.ifa_next;
392 }
393 }
394 }
395 }
396}
397
398#endif
399
400#ifdef DEBUG
401main()
402{
403 u_long ipaddr;
404 int s;
405
406 s = socket(AF_INET, SOCK_DGRAM, 0);
407 ipaddr = inet_addr("192.168.1.32");
408 sifproxyarp(s, ipaddr);
409 close(s);
410}
411
412#endif
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