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 #include "zebra/zebra_errors.h"
  44
  45 static int if_get_addr(struct interface *, struct sockaddr *, const char *);
  46 static void interface_info_ioctl(struct interface *);
  47 extern struct zebra_privs_t zserv_privs;
  48
  49 static int interface_list_ioctl(int af)
  50 {
  51         int ret;
  52         int sock;
  53 #define IFNUM_BASE 32
  54         struct lifnum lifn;
  55         int ifnum;
  56         struct lifreq *lifreq;
  57         struct lifconf lifconf;
  58         struct interface *ifp;
  59         int n;
  60         size_t needed, lastneeded = 0;
  61         char *buf = NULL;
  62
  63         frr_elevate_privs(&zserv_privs) {
  64                 sock = socket(af, SOCK_DGRAM, 0);
  65         }
  66
  67         if (sock < 0) {
  68                 flog_err_sys(EC_LIB_SOCKET, "Can't make %s socket stream: %s",
  69                              (af == AF_INET ? "AF_INET" : "AF_INET6"),
  70                              safe_strerror(errno));
  71                 return -1;
  72         }
  73
  74 calculate_lifc_len:
  75         frr_elevate_privs(&zserv_privs) {
  76                 lifn.lifn_family = af;
  77                 lifn.lifn_flags = LIFC_NOXMIT;
  78                 /* we want NOXMIT interfaces too */
  79                 ret = ioctl(sock, SIOCGLIFNUM, &lifn);
  80         }
  81
  82         if (ret < 0) {
  83                 flog_err_sys(EC_LIB_SYSTEM_CALL,
  84                              "interface_list_ioctl: SIOCGLIFNUM failed %s",
  85                              safe_strerror(errno));
  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                 if (buf != NULL)
 100                         XFREE(MTYPE_TMP, buf);
 101                 buf = XMALLOC(MTYPE_TMP, needed);
 102         }
 103         lastneeded = needed;
 104
 105         lifconf.lifc_family = af;
 106         lifconf.lifc_flags = LIFC_NOXMIT;
 107         lifconf.lifc_len = needed;
 108         lifconf.lifc_buf = buf;
 109
 110         frr_elevate_privs(&zserv_privs) {
 111                 ret = ioctl(sock, SIOCGLIFCONF, &lifconf);
 112         }
 113
 114         if (ret < 0) {
 115                 if (errno == EINVAL)
 116                         goto calculate_lifc_len;
 117
 118                 flog_err_sys(EC_LIB_SYSTEM_CALL, "SIOCGLIFCONF: %s",
 119                              safe_strerror(errno));
 120                 goto end;
 121         }
 122
 123         /* Allocate interface. */
 124         lifreq = lifconf.lifc_req;
 125
 126         for (n = 0; n < lifconf.lifc_len; n += sizeof(struct lifreq)) {
 127                 /* we treat Solaris logical interfaces as addresses, because
 128                  * that is
 129                  * how PF_ROUTE on Solaris treats them. Hence we can not
 130                  * directly use
 131                  * the lifreq_name to get the ifp.  We need to normalise the
 132                  * name
 133                  * before attempting get.
 134                  *
 135                  * Solaris logical interface names are in the form of:
 136                  * <interface name>:<logical interface id>
 137                  */
 138                 unsigned int normallen = 0;
 139                 uint64_t lifflags;
 140
 141                 /* We should exclude ~IFF_UP interfaces, as we'll find out about
 142                  * them
 143                  * coming up later through RTM_NEWADDR message on the route
 144                  * socket.
 145                  */
 146                 if (if_get_flags_direct(lifreq->lifr_name, &lifflags,
 147                                         lifreq->lifr_addr.ss_family)
 148                     || !CHECK_FLAG(lifflags, IFF_UP)) {
 149                         lifreq++;
 150                         continue;
 151                 }
 152
 153                 /* Find the normalised name */
 154                 while ((normallen < sizeof(lifreq->lifr_name))
 155                        && (*(lifreq->lifr_name + normallen) != '\0')
 156                        && (*(lifreq->lifr_name + normallen) != ':'))
 157                         normallen++;
 158
 159                 ifp = if_get_by_name(lifreq->lifr_name, VRF_DEFAULT);
 160
 161                 if (lifreq->lifr_addr.ss_family == AF_INET)
 162                         ifp->flags |= IFF_IPV4;
 163
 164                 if (lifreq->lifr_addr.ss_family == AF_INET6) {
 165                         ifp->flags |= IFF_IPV6;
 166                 }
 167
 168                 if_add_update(ifp);
 169
 170                 interface_info_ioctl(ifp);
 171
 172                 /* If a logical interface pass the full name so it can be
 173                  * as a label on the address
 174                  */
 175                 if (*(lifreq->lifr_name + normallen) != '\0')
 176                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 177                                     lifreq->lifr_name);
 178                 else
 179                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 180                                     NULL);
 181
 182                 /* Poke the interface flags. Lets IFF_UP mangling kick in */
 183                 if_flags_update(ifp, ifp->flags);
 184
 185                 lifreq++;
 186         }
 187
 188 end:
 189         close(sock);
 190         XFREE(MTYPE_TMP, lifconf.lifc_buf);
 191         return ret;
 192 }
 193
 194 /* Get interface's index by ioctl. */
 195 static int if_get_index(struct interface *ifp)
 196 {
 197         int ret;
 198         struct lifreq lifreq;
 199
 200         lifreq_set_name(&lifreq, ifp->name);
 201
 202         if (ifp->flags & IFF_IPV4)
 203                 ret = AF_IOCTL(AF_INET, SIOCGLIFINDEX, (caddr_t)&lifreq);
 204         else if (ifp->flags & IFF_IPV6)
 205                 ret = AF_IOCTL(AF_INET6, SIOCGLIFINDEX, (caddr_t)&lifreq);
 206         else
 207                 ret = -1;
 208
 209         if (ret < 0) {
 210                 flog_err_sys(EC_LIB_SYSTEM_CALL, "SIOCGLIFINDEX(%s) failed",
 211                              ifp->name);
 212                 return ret;
 213         }
 214
 215 /* OK we got interface index. */
 216 #ifdef ifr_ifindex
 217         if_set_index(ifp, lifreq.lifr_ifindex);
 218 #else
 219         if_set_index(ifp, lifreq.lifr_index);
 220 #endif
 221         return ifp->ifindex;
 222 }
 223
 224
 225 /* Interface address lookup by ioctl.  This function only looks up
 226    IPv4 address. */
 227 #define ADDRLEN(sa)                                                            \
 228         (((sa)->sa_family == AF_INET ? sizeof(struct sockaddr_in)              \
 229                                      : sizeof(struct sockaddr_in6)))
 230
 231 #define SIN(s) ((struct sockaddr_in *)(s))
 232 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 233
 234 /* Retrieve address information for the given ifp */
 235 static int if_get_addr(struct interface *ifp, struct sockaddr *addr,
 236                        const char *label)
 237 {
 238         int ret;
 239         struct lifreq lifreq;
 240         struct sockaddr_storage mask, dest;
 241         char *dest_pnt = NULL;
 242         uint8_t prefixlen = 0;
 243         afi_t af;
 244         int flags = 0;
 245
 246         /* Interface's name and address family.
 247          * We need to use the logical interface name / label, if we've been
 248          * given one, in order to get the right address
 249          */
 250         strncpy(lifreq.lifr_name, (label ? label : ifp->name), IFNAMSIZ);
 251
 252         /* Interface's address. */
 253         memcpy(&lifreq.lifr_addr, addr, ADDRLEN(addr));
 254         af = addr->sa_family;
 255
 256         /* Point to point or broad cast address pointer init. */
 257         dest_pnt = NULL;
 258
 259         if (AF_IOCTL(af, SIOCGLIFDSTADDR, (caddr_t)&lifreq) >= 0) {
 260                 memcpy(&dest, &lifreq.lifr_dstaddr, ADDRLEN(addr));
 261                 if (af == AF_INET)
 262                         dest_pnt = (char *)&(SIN(&dest)->sin_addr);
 263                 else
 264                         dest_pnt = (char *)&(SIN6(&dest)->sin6_addr);
 265                 flags = ZEBRA_IFA_PEER;
 266         }
 267
 268         if (af == AF_INET) {
 269                 ret = if_ioctl(SIOCGLIFNETMASK, (caddr_t)&lifreq);
 270
 271                 if (ret < 0) {
 272                         if (errno != EADDRNOTAVAIL) {
 273                                 flog_err_sys(EC_LIB_SYSTEM_CALL,
 274                                              "SIOCGLIFNETMASK (%s) fail: %s",
 275                                              ifp->name, safe_strerror(errno));
 276                                 return ret;
 277                         }
 278                         return 0;
 279                 }
 280                 memcpy(&mask, &lifreq.lifr_addr, ADDRLEN(addr));
 281
 282                 prefixlen = ip_masklen(SIN(&mask)->sin_addr);
 283                 if (!dest_pnt
 284                     && (if_ioctl(SIOCGLIFBRDADDR, (caddr_t)&lifreq) >= 0)) {
 285                         memcpy(&dest, &lifreq.lifr_broadaddr,
 286                                sizeof(struct sockaddr_in));
 287                         dest_pnt = (char *)&SIN(&dest)->sin_addr;
 288                 }
 289         } else if (af == AF_INET6) {
 290                 if (if_ioctl_ipv6(SIOCGLIFSUBNET, (caddr_t)&lifreq) < 0) {
 291                         if (ifp->flags & IFF_POINTOPOINT)
 292                                 prefixlen = IPV6_MAX_BITLEN;
 293                         else
 294                                 flog_err_sys(EC_LIB_SYSTEM_CALL,
 295                                              "SIOCGLIFSUBNET (%s) fail: %s",
 296                                              ifp->name, safe_strerror(errno));
 297                 } else {
 298                         prefixlen = lifreq.lifr_addrlen;
 299                 }
 300         }
 301
 302         /* Set address to the interface. */
 303         if (af == AF_INET)
 304                 connected_add_ipv4(ifp, flags, &SIN(addr)->sin_addr, prefixlen,
 305                                    (struct in_addr *)dest_pnt, label);
 306         else if (af == AF_INET6)
 307                 connected_add_ipv6(ifp, flags, &SIN6(addr)->sin6_addr, NULL,
 308                                    prefixlen, label);
 309
 310         return 0;
 311 }
 312
 313 /* Fetch interface information via ioctl(). */
 314 static void interface_info_ioctl(struct interface *ifp)
 315 {
 316         if_get_index(ifp);
 317         if_get_flags(ifp);
 318         if_get_mtu(ifp);
 319         if_get_metric(ifp);
 320 }
 321
 322 /* Lookup all interface information. */
 323 void interface_list(struct zebra_ns *zns)
 324 {
 325         if (zns->ns_id != NS_DEFAULT) {
 326                 zlog_debug("interface_list: ignore NS %u", zns->ns_id);
 327                 return;
 328         }
 329         interface_list_ioctl(AF_INET);
 330         interface_list_ioctl(AF_INET6);
 331         interface_list_ioctl(AF_UNSPEC);
 332 }
 333
 334 struct connected *if_lookup_linklocal(struct interface *ifp)
 335 {
 336         struct listnode *node;
 337         struct connected *ifc;
 338
 339         if (ifp == NULL)
 340                 return NULL;
 341
 342         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
 343                 if ((ifc->address->family == AF_INET6)
 344                     && (IN6_IS_ADDR_LINKLOCAL(&ifc->address->u.prefix6)))
 345                         return ifc;
 346         }
 347
 348         return NULL;
 349 }
 350
 351 #endif /* SUNOS_5 */