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