zebra/if_ioctl_solaris.c

   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 along
  18  * with this program; see the file COPYING; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include <zebra.h>
  23
  24 #ifdef SUNOS_5
  25
  26 #include "if.h"
  27 #include "sockunion.h"
  28 #include "prefix.h"
  29 #include "ioctl.h"
  30 #include "connected.h"
  31 #include "memory.h"
  32 #include "zebra_memory.h"
  33 #include "log.h"
  34 #include "privs.h"
  35 #include "vrf.h"
  36 #include "vty.h"
  37 #include "lib_errors.h"
  38
  39 #include "zebra/interface.h"
  40 #include "zebra/ioctl_solaris.h"
  41 #include "zebra/rib.h"
  42 #include "zebra/rt.h"
  43
  44 static int if_get_addr(struct interface *, struct sockaddr *, const char *);
  45 static void interface_info_ioctl(struct interface *);
  46 extern struct zebra_privs_t zserv_privs;
  47
  48 static int interface_list_ioctl(int af)
  49 {
  50         int ret;
  51         int sock;
  52 #define IFNUM_BASE 32
  53         struct lifnum lifn;
  54         int ifnum;
  55         struct lifreq *lifreq;
  56         struct lifconf lifconf;
  57         struct interface *ifp;
  58         int n;
  59         size_t needed, lastneeded = 0;
  60         char *buf = NULL;
  61
  62         frr_elevate_privs(&zserv_privs) {
  63                 sock = socket(af, SOCK_DGRAM, 0);
  64         }
  65
  66         if (sock < 0) {
  67                 zlog_warn("Can't make %s socket stream: %s",
  68                           (af == AF_INET ? "AF_INET" : "AF_INET6"),
  69                           safe_strerror(errno));
  70                 return -1;
  71         }
  72
  73 calculate_lifc_len:
  74         frr_elevate_privs(&zserv_privs) {
  75                 lifn.lifn_family = af;
  76                 lifn.lifn_flags = LIFC_NOXMIT;
  77                 /* we want NOXMIT interfaces too */
  78                 ret = ioctl(sock, SIOCGLIFNUM, &lifn);
  79         }
  80
  81         if (ret < 0) {
  82                 zlog_warn("interface_list_ioctl: SIOCGLIFNUM failed %s",
  83                           safe_strerror(errno));
  84                 close(sock);
  85                 return -1;
  86         }
  87         ifnum = lifn.lifn_count;
  88
  89         /*
  90          * When calculating the buffer size needed, add a small number
  91          * of interfaces to those we counted.  We do this to capture
  92          * the interface status of potential interfaces which may have
  93          * been plumbed between the SIOCGLIFNUM and the SIOCGLIFCONF.
  94          */
  95         needed = (ifnum + 4) * sizeof(struct lifreq);
  96         if (needed > lastneeded || needed < lastneeded / 2) {
  97                 if (buf != NULL)
  98                         XFREE(MTYPE_TMP, buf);
  99                 buf = XMALLOC(MTYPE_TMP, needed);
 100         }
 101         lastneeded = needed;
 102
 103         lifconf.lifc_family = af;
 104         lifconf.lifc_flags = LIFC_NOXMIT;
 105         lifconf.lifc_len = needed;
 106         lifconf.lifc_buf = buf;
 107
 108         frr_elevate_privs(&zserv_privs) {
 109                 ret = ioctl(sock, SIOCGLIFCONF, &lifconf);
 110         }
 111
 112         if (ret < 0) {
 113                 if (errno == EINVAL)
 114                         goto calculate_lifc_len;
 115
 116                 zlog_warn("SIOCGLIFCONF: %s", safe_strerror(errno));
 117                 goto end;
 118         }
 119
 120         /* Allocate interface. */
 121         lifreq = lifconf.lifc_req;
 122
 123         for (n = 0; n < lifconf.lifc_len; n += sizeof(struct lifreq)) {
 124                 /* we treat Solaris logical interfaces as addresses, because
 125                  * that is
 126                  * how PF_ROUTE on Solaris treats them. Hence we can not
 127                  * directly use
 128                  * the lifreq_name to get the ifp.  We need to normalise the
 129                  * name
 130                  * before attempting get.
 131                  *
 132                  * Solaris logical interface names are in the form of:
 133                  * <interface name>:<logical interface id>
 134                  */
 135                 unsigned int normallen = 0;
 136                 uint64_t lifflags;
 137
 138                 /* We should exclude ~IFF_UP interfaces, as we'll find out about
 139                  * them
 140                  * coming up later through RTM_NEWADDR message on the route
 141                  * socket.
 142                  */
 143                 if (if_get_flags_direct(lifreq->lifr_name, &lifflags,
 144                                         lifreq->lifr_addr.ss_family)
 145                     || !CHECK_FLAG(lifflags, IFF_UP)) {
 146                         lifreq++;
 147                         continue;
 148                 }
 149
 150                 /* Find the normalised name */
 151                 while ((normallen < sizeof(lifreq->lifr_name))
 152                        && (*(lifreq->lifr_name + normallen) != '\0')
 153                        && (*(lifreq->lifr_name + normallen) != ':'))
 154                         normallen++;
 155
 156                 ifp = if_get_by_name(lifreq->lifr_name, VRF_DEFAULT, 0);
 157
 158                 if (lifreq->lifr_addr.ss_family == AF_INET)
 159                         ifp->flags |= IFF_IPV4;
 160
 161                 if (lifreq->lifr_addr.ss_family == AF_INET6) {
 162                         ifp->flags |= IFF_IPV6;
 163                 }
 164
 165                 if_add_update(ifp);
 166
 167                 interface_info_ioctl(ifp);
 168
 169                 /* If a logical interface pass the full name so it can be
 170                  * as a label on the address
 171                  */
 172                 if (*(lifreq->lifr_name + normallen) != '\0')
 173                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 174                                     lifreq->lifr_name);
 175                 else
 176                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 177                                     NULL);
 178
 179                 /* Poke the interface flags. Lets IFF_UP mangling kick in */
 180                 if_flags_update(ifp, ifp->flags);
 181
 182                 lifreq++;
 183         }
 184
 185 end:
 186         close(sock);
 187         XFREE(MTYPE_TMP, lifconf.lifc_buf);
 188         return ret;
 189 }
 190
 191 /* Get interface's index by ioctl. */
 192 static int if_get_index(struct interface *ifp)
 193 {
 194         int ret;
 195         struct lifreq lifreq;
 196
 197         lifreq_set_name(&lifreq, ifp->name);
 198
 199         if (ifp->flags & IFF_IPV4)
 200                 ret = AF_IOCTL(AF_INET, SIOCGLIFINDEX, (caddr_t)&lifreq);
 201         else if (ifp->flags & IFF_IPV6)
 202                 ret = AF_IOCTL(AF_INET6, SIOCGLIFINDEX, (caddr_t)&lifreq);
 203         else
 204                 ret = -1;
 205
 206         if (ret < 0) {
 207                 zlog_warn("SIOCGLIFINDEX(%s) failed", ifp->name);
 208                 return ret;
 209         }
 210
 211 /* OK we got interface index. */
 212 #ifdef ifr_ifindex
 213         if_set_index(ifp, lifreq.lifr_ifindex);
 214 #else
 215         if_set_index(ifp, lifreq.lifr_index);
 216 #endif
 217         return ifp->ifindex;
 218 }
 219
 220
 221 /* Interface address lookup by ioctl.  This function only looks up
 222    IPv4 address. */
 223 #define ADDRLEN(sa)                                                            \
 224         (((sa)->sa_family == AF_INET ? sizeof(struct sockaddr_in)              \
 225                                      : sizeof(struct sockaddr_in6)))
 226
 227 #define SIN(s) ((struct sockaddr_in *)(s))
 228 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 229
 230 /* Retrieve address information for the given ifp */
 231 static int if_get_addr(struct interface *ifp, struct sockaddr *addr,
 232                        const char *label)
 233 {
 234         int ret;
 235         struct lifreq lifreq;
 236         struct sockaddr_storage mask, dest;
 237         char *dest_pnt = NULL;
 238         uint8_t prefixlen = 0;
 239         afi_t af;
 240         int flags = 0;
 241
 242         /* Interface's name and address family.
 243          * We need to use the logical interface name / label, if we've been
 244          * given one, in order to get the right address
 245          */
 246         strncpy(lifreq.lifr_name, (label ? label : ifp->name), IFNAMSIZ);
 247
 248         /* Interface's address. */
 249         memcpy(&lifreq.lifr_addr, addr, ADDRLEN(addr));
 250         af = addr->sa_family;
 251
 252         /* Point to point or broad cast address pointer init. */
 253         dest_pnt = NULL;
 254
 255         if (AF_IOCTL(af, SIOCGLIFDSTADDR, (caddr_t)&lifreq) >= 0) {
 256                 memcpy(&dest, &lifreq.lifr_dstaddr, ADDRLEN(addr));
 257                 if (af == AF_INET)
 258                         dest_pnt = (char *)&(SIN(&dest)->sin_addr);
 259                 else
 260                         dest_pnt = (char *)&(SIN6(&dest)->sin6_addr);
 261                 flags = ZEBRA_IFA_PEER;
 262         }
 263
 264         if (af == AF_INET) {
 265                 ret = if_ioctl(SIOCGLIFNETMASK, (caddr_t)&lifreq);
 266
 267                 if (ret < 0) {
 268                         if (errno != EADDRNOTAVAIL) {
 269                                 zlog_warn("SIOCGLIFNETMASK (%s) fail: %s",
 270                                           ifp->name, safe_strerror(errno));
 271                                 return ret;
 272                         }
 273                         return 0;
 274                 }
 275                 memcpy(&mask, &lifreq.lifr_addr, ADDRLEN(addr));
 276
 277                 prefixlen = ip_masklen(SIN(&mask)->sin_addr);
 278                 if (!dest_pnt
 279                     && (if_ioctl(SIOCGLIFBRDADDR, (caddr_t)&lifreq) >= 0)) {
 280                         memcpy(&dest, &lifreq.lifr_broadaddr,
 281                                sizeof(struct sockaddr_in));
 282                         dest_pnt = (char *)&SIN(&dest)->sin_addr;
 283                 }
 284         } else if (af == AF_INET6) {
 285                 if (if_ioctl_ipv6(SIOCGLIFSUBNET, (caddr_t)&lifreq) < 0) {
 286                         if (ifp->flags & IFF_POINTOPOINT)
 287                                 prefixlen = IPV6_MAX_BITLEN;
 288                         else
 289                                 zlog_warn("SIOCGLIFSUBNET (%s) fail: %s",
 290                                           ifp->name, safe_strerror(errno));
 291                 } else {
 292                         prefixlen = lifreq.lifr_addrlen;
 293                 }
 294         }
 295
 296         /* Set address to the interface. */
 297         if (af == AF_INET)
 298                 connected_add_ipv4(ifp, flags, &SIN(addr)->sin_addr, prefixlen,
 299                                    (struct in_addr *)dest_pnt, label);
 300         else if (af == AF_INET6)
 301                 connected_add_ipv6(ifp, flags, &SIN6(addr)->sin6_addr, NULL,
 302                                    prefixlen, label);
 303
 304         return 0;
 305 }
 306
 307 /* Fetch interface information via ioctl(). */
 308 static void interface_info_ioctl(struct interface *ifp)
 309 {
 310         if_get_index(ifp);
 311         if_get_flags(ifp);
 312         if_get_mtu(ifp);
 313         if_get_metric(ifp);
 314 }
 315
 316 /* Lookup all interface information. */
 317 void interface_list(struct zebra_ns *zns)
 318 {
 319         if (zns->ns_id != NS_DEFAULT) {
 320                 zlog_warn("interface_list: ignore NS %u", zns->ns_id);
 321                 return;
 322         }
 323         interface_list_ioctl(AF_INET);
 324         interface_list_ioctl(AF_INET6);
 325         interface_list_ioctl(AF_UNSPEC);
 326 }
 327
 328 struct connected *if_lookup_linklocal(struct interface *ifp)
 329 {
 330         struct listnode *node;
 331         struct connected *ifc;
 332
 333         if (ifp == NULL)
 334                 return NULL;
 335
 336         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
 337                 if ((ifc->address->family == AF_INET6)
 338                     && (IN6_IS_ADDR_LINKLOCAL(&ifc->address->u.prefix6)))
 339                         return ifc;
 340         }
 341
 342         return NULL;
 343 }
 344
 345 #endif /* SUNOS_5 */