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8842468c | 1 | /* |
2 | * Interface looking up by ioctl () on Solaris. | |
3 | * Copyright (C) 1997, 98 Kunihiro Ishiguro | |
4 | * | |
5 | * This file is part of GNU Zebra. | |
6 | * | |
7 | * GNU Zebra is free software; you can redistribute it and/or modify it | |
8 | * under the terms of the GNU General Public License as published by the | |
9 | * Free Software Foundation; either version 2, or (at your option) any | |
10 | * later version. | |
11 | * | |
12 | * GNU Zebra is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with GNU Zebra; see the file COPYING. If not, write to the Free | |
19 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
20 | * 02111-1307, USA. | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "if.h" | |
26 | #include "sockunion.h" | |
27 | #include "prefix.h" | |
28 | #include "ioctl.h" | |
29 | #include "connected.h" | |
30 | #include "memory.h" | |
31 | #include "log.h" | |
48a46fa0 | 32 | #include "privs.h" |
8842468c | 33 | |
34 | #include "zebra/interface.h" | |
35 | ||
5c78b3d0 | 36 | void lifreq_set_name (struct lifreq *, const char *); |
37 | int if_get_flags_direct (const char *, uint64_t *, unsigned int af); | |
0752ef0b | 38 | static int if_get_addr (struct interface *, struct sockaddr *, const char *); |
8842468c | 39 | static void interface_info_ioctl (struct interface *); |
48a46fa0 | 40 | extern struct zebra_privs_t zserv_privs; |
8842468c | 41 | |
42 | int | |
43 | interface_list_ioctl (int af) | |
44 | { | |
45 | int ret; | |
46 | int sock; | |
47 | #define IFNUM_BASE 32 | |
48 | struct lifnum lifn; | |
49 | int ifnum; | |
50 | struct lifreq *lifreq; | |
51 | struct lifconf lifconf; | |
52 | struct interface *ifp; | |
53 | int n; | |
4460e7a4 | 54 | int save_errno; |
8842468c | 55 | size_t needed, lastneeded = 0; |
56 | char *buf = NULL; | |
57 | ||
58 | if (zserv_privs.change(ZPRIVS_RAISE)) | |
59 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
60 | ||
61 | sock = socket (af, SOCK_DGRAM, 0); | |
62 | if (sock < 0) | |
63 | { | |
64 | zlog_warn ("Can't make %s socket stream: %s", | |
6099b3b5 | 65 | (af == AF_INET ? "AF_INET" : "AF_INET6"), safe_strerror (errno)); |
8842468c | 66 | |
67 | if (zserv_privs.change(ZPRIVS_LOWER)) | |
68 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
69 | ||
70 | return -1; | |
71 | } | |
72 | ||
73 | calculate_lifc_len: /* must hold privileges to enter here */ | |
74 | lifn.lifn_family = af; | |
0752ef0b | 75 | lifn.lifn_flags = LIFC_NOXMIT; /* we want NOXMIT interfaces too */ |
8842468c | 76 | ret = ioctl (sock, SIOCGLIFNUM, &lifn); |
4460e7a4 | 77 | save_errno = errno; |
8842468c | 78 | |
79 | if (zserv_privs.change(ZPRIVS_LOWER)) | |
80 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
81 | ||
82 | if (ret < 0) | |
83 | { | |
84 | zlog_warn ("interface_list_ioctl: SIOCGLIFNUM failed %s", | |
4460e7a4 | 85 | safe_strerror (save_errno)); |
8842468c | 86 | close (sock); |
87 | return -1; | |
88 | } | |
89 | ifnum = lifn.lifn_count; | |
90 | ||
91 | /* | |
92 | * When calculating the buffer size needed, add a small number | |
93 | * of interfaces to those we counted. We do this to capture | |
94 | * the interface status of potential interfaces which may have | |
95 | * been plumbed between the SIOCGLIFNUM and the SIOCGLIFCONF. | |
96 | */ | |
97 | needed = (ifnum + 4) * sizeof (struct lifreq); | |
98 | if (needed > lastneeded || needed < lastneeded / 2) | |
99 | { | |
100 | if (buf != NULL) | |
101 | XFREE (MTYPE_TMP, buf); | |
102 | if ((buf = XMALLOC (MTYPE_TMP, needed)) == NULL) | |
103 | { | |
104 | zlog_warn ("interface_list_ioctl: malloc failed"); | |
105 | close (sock); | |
106 | return -1; | |
107 | } | |
108 | } | |
109 | lastneeded = needed; | |
110 | ||
111 | lifconf.lifc_family = af; | |
0752ef0b | 112 | lifconf.lifc_flags = LIFC_NOXMIT; |
8842468c | 113 | lifconf.lifc_len = needed; |
114 | lifconf.lifc_buf = buf; | |
115 | ||
116 | if (zserv_privs.change(ZPRIVS_RAISE)) | |
117 | zlog (NULL, LOG_ERR, "Can't raise privileges"); | |
118 | ||
119 | ret = ioctl (sock, SIOCGLIFCONF, &lifconf); | |
120 | ||
121 | if (ret < 0) | |
122 | { | |
123 | if (errno == EINVAL) | |
124 | goto calculate_lifc_len; /* deliberately hold privileges */ | |
125 | ||
6099b3b5 | 126 | zlog_warn ("SIOCGLIFCONF: %s", safe_strerror (errno)); |
8842468c | 127 | |
128 | if (zserv_privs.change(ZPRIVS_LOWER)) | |
129 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
130 | ||
131 | goto end; | |
132 | } | |
133 | ||
134 | if (zserv_privs.change(ZPRIVS_LOWER)) | |
135 | zlog (NULL, LOG_ERR, "Can't lower privileges"); | |
136 | ||
137 | /* Allocate interface. */ | |
138 | lifreq = lifconf.lifc_req; | |
139 | ||
140 | for (n = 0; n < lifconf.lifc_len; n += sizeof (struct lifreq)) | |
141 | { | |
0752ef0b | 142 | /* we treat Solaris logical interfaces as addresses, because that is |
143 | * how PF_ROUTE on Solaris treats them. Hence we can not directly use | |
144 | * the lifreq_name to get the ifp. We need to normalise the name | |
145 | * before attempting get. | |
146 | * | |
147 | * Solaris logical interface names are in the form of: | |
148 | * <interface name>:<logical interface id> | |
149 | */ | |
150 | unsigned int normallen = 0; | |
5c78b3d0 | 151 | uint64_t lifflags; |
0752ef0b | 152 | |
5c78b3d0 | 153 | /* We should exclude ~IFF_UP interfaces, as we'll find out about them |
154 | * coming up later through RTM_NEWADDR message on the route socket. | |
155 | */ | |
156 | if (if_get_flags_direct (lifreq->lifr_name, &lifflags, | |
157 | lifreq->lifr_addr.ss_family) | |
158 | || !CHECK_FLAG (lifflags, IFF_UP)) | |
159 | { | |
160 | lifreq++; | |
161 | continue; | |
162 | } | |
163 | ||
164 | /* Find the normalised name */ | |
0752ef0b | 165 | while ( (normallen < sizeof(lifreq->lifr_name)) |
166 | && ( *(lifreq->lifr_name + normallen) != '\0') | |
167 | && ( *(lifreq->lifr_name + normallen) != ':') ) | |
168 | normallen++; | |
169 | ||
170 | ifp = if_get_by_name_len(lifreq->lifr_name, normallen); | |
5b73a671 | 171 | |
8842468c | 172 | if (lifreq->lifr_addr.ss_family == AF_INET) |
173 | ifp->flags |= IFF_IPV4; | |
5b73a671 | 174 | |
8842468c | 175 | if (lifreq->lifr_addr.ss_family == AF_INET6) |
5b73a671 | 176 | { |
177 | #ifdef HAVE_IPV6 | |
178 | ifp->flags |= IFF_IPV6; | |
179 | #else | |
180 | lifreq++; | |
181 | continue; | |
182 | #endif /* HAVE_IPV6 */ | |
183 | } | |
184 | ||
8842468c | 185 | if_add_update (ifp); |
5b73a671 | 186 | |
8842468c | 187 | interface_info_ioctl (ifp); |
0752ef0b | 188 | |
189 | /* If a logical interface pass the full name so it can be | |
190 | * as a label on the address | |
191 | */ | |
192 | if ( *(lifreq->lifr_name + normallen) != '\0') | |
193 | if_get_addr (ifp, (struct sockaddr *) &lifreq->lifr_addr, | |
194 | lifreq->lifr_name); | |
195 | else | |
196 | if_get_addr (ifp, (struct sockaddr *) &lifreq->lifr_addr, NULL); | |
5c78b3d0 | 197 | |
198 | /* Poke the interface flags. Lets IFF_UP mangling kick in */ | |
199 | if_flags_update (ifp, ifp->flags); | |
200 | ||
8842468c | 201 | lifreq++; |
202 | } | |
203 | ||
204 | end: | |
205 | close (sock); | |
206 | XFREE (MTYPE_TMP, lifconf.lifc_buf); | |
207 | return ret; | |
208 | } | |
209 | ||
210 | /* Get interface's index by ioctl. */ | |
211 | int | |
212 | if_get_index (struct interface *ifp) | |
213 | { | |
214 | int ret; | |
215 | struct lifreq lifreq; | |
216 | ||
e8eb8340 | 217 | lifreq_set_name (&lifreq, ifp->name); |
8842468c | 218 | |
8842468c | 219 | if (ifp->flags & IFF_IPV4) |
220 | ret = AF_IOCTL (AF_INET, SIOCGLIFINDEX, (caddr_t) & lifreq); | |
221 | else if (ifp->flags & IFF_IPV6) | |
222 | ret = AF_IOCTL (AF_INET6, SIOCGLIFINDEX, (caddr_t) & lifreq); | |
223 | else | |
224 | ret = -1; | |
225 | ||
8842468c | 226 | if (ret < 0) |
227 | { | |
228 | zlog_warn ("SIOCGLIFINDEX(%s) failed", ifp->name); | |
229 | return ret; | |
230 | } | |
231 | ||
232 | /* OK we got interface index. */ | |
233 | #ifdef ifr_ifindex | |
234 | ifp->ifindex = lifreq.lifr_ifindex; | |
235 | #else | |
236 | ifp->ifindex = lifreq.lifr_index; | |
237 | #endif | |
238 | return ifp->ifindex; | |
239 | ||
240 | } | |
241 | ||
242 | ||
243 | /* Interface address lookup by ioctl. This function only looks up | |
244 | IPv4 address. */ | |
245 | #define ADDRLEN(sa) (((sa)->sa_family == AF_INET ? \ | |
246 | sizeof (struct sockaddr_in) : sizeof (struct sockaddr_in6))) | |
247 | ||
248 | #define SIN(s) ((struct sockaddr_in *)(s)) | |
249 | #define SIN6(s) ((struct sockaddr_in6 *)(s)) | |
250 | ||
0752ef0b | 251 | /* Retrieve address information for the given ifp */ |
8842468c | 252 | static int |
0752ef0b | 253 | if_get_addr (struct interface *ifp, struct sockaddr *addr, const char *label) |
8842468c | 254 | { |
255 | int ret; | |
256 | struct lifreq lifreq; | |
257 | struct sockaddr_storage mask, dest; | |
258 | char *dest_pnt = NULL; | |
259 | u_char prefixlen = 0; | |
260 | afi_t af; | |
e4529636 | 261 | int flags = 0; |
8842468c | 262 | |
0752ef0b | 263 | /* Interface's name and address family. |
264 | * We need to use the logical interface name / label, if we've been | |
265 | * given one, in order to get the right address | |
266 | */ | |
11967e92 | 267 | strncpy (lifreq.lifr_name, (label ? label : ifp->name), IFNAMSIZ); |
8842468c | 268 | |
269 | /* Interface's address. */ | |
270 | memcpy (&lifreq.lifr_addr, addr, ADDRLEN (addr)); | |
271 | af = addr->sa_family; | |
272 | ||
273 | /* Point to point or broad cast address pointer init. */ | |
274 | dest_pnt = NULL; | |
275 | ||
e4529636 | 276 | if (AF_IOCTL (af, SIOCGLIFDSTADDR, (caddr_t) & lifreq) >= 0) |
8842468c | 277 | { |
8842468c | 278 | memcpy (&dest, &lifreq.lifr_dstaddr, ADDRLEN (addr)); |
279 | if (af == AF_INET) | |
280 | dest_pnt = (char *) &(SIN (&dest)->sin_addr); | |
281 | else | |
282 | dest_pnt = (char *) &(SIN6 (&dest)->sin6_addr); | |
e4529636 | 283 | flags = ZEBRA_IFA_PEER; |
8842468c | 284 | } |
285 | ||
286 | if (af == AF_INET) | |
287 | { | |
288 | ret = if_ioctl (SIOCGLIFNETMASK, (caddr_t) & lifreq); | |
289 | ||
290 | if (ret < 0) | |
291 | { | |
292 | if (errno != EADDRNOTAVAIL) | |
293 | { | |
294 | zlog_warn ("SIOCGLIFNETMASK (%s) fail: %s", ifp->name, | |
6099b3b5 | 295 | safe_strerror (errno)); |
8842468c | 296 | return ret; |
297 | } | |
298 | return 0; | |
299 | } | |
300 | memcpy (&mask, &lifreq.lifr_addr, ADDRLEN (addr)); | |
301 | ||
302 | prefixlen = ip_masklen (SIN (&mask)->sin_addr); | |
e4529636 AS |
303 | if (!dest_pnt && (if_ioctl (SIOCGLIFBRDADDR, (caddr_t) & lifreq) >= 0)) |
304 | { | |
8842468c | 305 | memcpy (&dest, &lifreq.lifr_broadaddr, sizeof (struct sockaddr_in)); |
306 | dest_pnt = (char *) &SIN (&dest)->sin_addr; | |
307 | } | |
308 | } | |
5b73a671 | 309 | #ifdef HAVE_IPV6 |
310 | else if (af == AF_INET6) | |
8842468c | 311 | { |
fb6724a6 AS |
312 | if (if_ioctl_ipv6 (SIOCGLIFSUBNET, (caddr_t) & lifreq) < 0) |
313 | { | |
314 | if (ifp->flags & IFF_POINTOPOINT) | |
315 | prefixlen = IPV6_MAX_BITLEN; | |
316 | else | |
317 | zlog_warn ("SIOCGLIFSUBNET (%s) fail: %s", | |
318 | ifp->name, safe_strerror (errno)); | |
319 | } | |
8842468c | 320 | else |
fb6724a6 AS |
321 | { |
322 | prefixlen = lifreq.lifr_addrlen; | |
323 | } | |
8842468c | 324 | } |
5b73a671 | 325 | #endif /* HAVE_IPV6 */ |
8842468c | 326 | |
327 | /* Set address to the interface. */ | |
328 | if (af == AF_INET) | |
e4529636 | 329 | connected_add_ipv4 (ifp, flags, &SIN (addr)->sin_addr, prefixlen, |
0752ef0b | 330 | (struct in_addr *) dest_pnt, label); |
5b73a671 | 331 | #ifdef HAVE_IPV6 |
332 | else if (af == AF_INET6) | |
e4529636 | 333 | connected_add_ipv6 (ifp, flags, &SIN6 (addr)->sin6_addr, prefixlen, |
0752ef0b | 334 | (struct in6_addr *) dest_pnt, label); |
5b73a671 | 335 | #endif /* HAVE_IPV6 */ |
8842468c | 336 | |
337 | return 0; | |
338 | } | |
339 | ||
340 | /* Fetch interface information via ioctl(). */ | |
341 | static void | |
342 | interface_info_ioctl (struct interface *ifp) | |
343 | { | |
344 | if_get_index (ifp); | |
345 | if_get_flags (ifp); | |
346 | if_get_mtu (ifp); | |
347 | if_get_metric (ifp); | |
348 | } | |
349 | ||
350 | /* Lookup all interface information. */ | |
351 | void | |
352 | interface_list () | |
353 | { | |
354 | interface_list_ioctl (AF_INET); | |
355 | interface_list_ioctl (AF_INET6); | |
0752ef0b | 356 | interface_list_ioctl (AF_UNSPEC); |
8842468c | 357 | } |
358 | ||
359 | struct connected * | |
360 | if_lookup_linklocal (struct interface *ifp) | |
361 | { | |
5b73a671 | 362 | #ifdef HAVE_IPV6 |
0c0f9112 | 363 | struct listnode *node; |
8842468c | 364 | struct connected *ifc; |
365 | ||
366 | if (ifp == NULL) | |
367 | return NULL; | |
368 | ||
cf460ef9 | 369 | for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) |
8842468c | 370 | { |
8842468c | 371 | if ((ifc->address->family == AF_INET6) && |
372 | (IN6_IS_ADDR_LINKLOCAL (&ifc->address->u.prefix6))) | |
373 | return ifc; | |
374 | } | |
5b73a671 | 375 | #endif /* HAVE_IPV6 */ |
376 | ||
8842468c | 377 | return NULL; |
378 | } |