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
  38 #include "zebra/interface.h"
  39 #include "zebra/ioctl_solaris.h"
  40 #include "zebra/rib.h"
  41
  42 static int if_get_addr(struct interface *, struct sockaddr *, const char *);
  43 static void interface_info_ioctl(struct interface *);
  44 extern struct zebra_privs_t zserv_privs;
  45
  46 static int interface_list_ioctl(int af)
  47 {
  48         int ret;
  49         int sock;
  50 #define IFNUM_BASE 32
  51         struct lifnum lifn;
  52         int ifnum;
  53         struct lifreq *lifreq;
  54         struct lifconf lifconf;
  55         struct interface *ifp;
  56         int n;
  57         int save_errno;
  58         size_t needed, lastneeded = 0;
  59         char *buf = NULL;
  60
  61         if (zserv_privs.change(ZPRIVS_RAISE))
  62                 zlog_err("Can't raise privileges");
  63
  64         sock = socket(af, SOCK_DGRAM, 0);
  65         if (sock < 0) {
  66                 zlog_warn("Can't make %s socket stream: %s",
  67                           (af == AF_INET ? "AF_INET" : "AF_INET6"),
  68                           safe_strerror(errno));
  69
  70                 if (zserv_privs.change(ZPRIVS_LOWER))
  71                         zlog_err("Can't lower privileges");
  72
  73                 return -1;
  74         }
  75
  76 calculate_lifc_len: /* must hold privileges to enter here */
  77         lifn.lifn_family = af;
  78         lifn.lifn_flags = LIFC_NOXMIT; /* we want NOXMIT interfaces too */
  79         ret = ioctl(sock, SIOCGLIFNUM, &lifn);
  80         save_errno = errno;
  81
  82         if (zserv_privs.change(ZPRIVS_LOWER))
  83                 zlog_err("Can't lower privileges");
  84
  85         if (ret < 0) {
  86                 zlog_warn("interface_list_ioctl: SIOCGLIFNUM failed %s",
  87                           safe_strerror(save_errno));
  88                 close(sock);
  89                 return -1;
  90         }
  91         ifnum = lifn.lifn_count;
  92
  93         /*
  94          * When calculating the buffer size needed, add a small number
  95          * of interfaces to those we counted.  We do this to capture
  96          * the interface status of potential interfaces which may have
  97          * been plumbed between the SIOCGLIFNUM and the SIOCGLIFCONF.
  98          */
  99         needed = (ifnum + 4) * sizeof(struct lifreq);
 100         if (needed > lastneeded || needed < lastneeded / 2) {
 101                 if (buf != NULL)
 102                         XFREE(MTYPE_TMP, buf);
 103                 if ((buf = XMALLOC(MTYPE_TMP, needed)) == NULL) {
 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;
 112         lifconf.lifc_flags = LIFC_NOXMIT;
 113         lifconf.lifc_len = needed;
 114         lifconf.lifc_buf = buf;
 115
 116         if (zserv_privs.change(ZPRIVS_RAISE))
 117                 zlog_err("Can't raise privileges");
 118
 119         ret = ioctl(sock, SIOCGLIFCONF, &lifconf);
 120
 121         if (ret < 0) {
 122                 if (errno == EINVAL)
 123                         goto calculate_lifc_len; /* deliberately hold privileges
 124                                                     */
 125
 126                 zlog_warn("SIOCGLIFCONF: %s", safe_strerror(errno));
 127
 128                 if (zserv_privs.change(ZPRIVS_LOWER))
 129                         zlog_err("Can't lower privileges");
 130
 131                 goto end;
 132         }
 133
 134         if (zserv_privs.change(ZPRIVS_LOWER))
 135                 zlog_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                 /* we treat Solaris logical interfaces as addresses, because
 142                  * that is
 143                  * how PF_ROUTE on Solaris treats them. Hence we can not
 144                  * directly use
 145                  * the lifreq_name to get the ifp.  We need to normalise the
 146                  * name
 147                  * before attempting get.
 148                  *
 149                  * Solaris logical interface names are in the form of:
 150                  * <interface name>:<logical interface id>
 151                  */
 152                 unsigned int normallen = 0;
 153                 uint64_t lifflags;
 154
 155                 /* We should exclude ~IFF_UP interfaces, as we'll find out about
 156                  * them
 157                  * coming up later through RTM_NEWADDR message on the route
 158                  * socket.
 159                  */
 160                 if (if_get_flags_direct(lifreq->lifr_name, &lifflags,
 161                                         lifreq->lifr_addr.ss_family)
 162                     || !CHECK_FLAG(lifflags, IFF_UP)) {
 163                         lifreq++;
 164                         continue;
 165                 }
 166
 167                 /* Find the normalised name */
 168                 while ((normallen < sizeof(lifreq->lifr_name))
 169                        && (*(lifreq->lifr_name + normallen) != '\0')
 170                        && (*(lifreq->lifr_name + normallen) != ':'))
 171                         normallen++;
 172
 173                 ifp = if_get_by_name(lifreq->lifr_name, VRF_DEFAULT, 0);
 174
 175                 if (lifreq->lifr_addr.ss_family == AF_INET)
 176                         ifp->flags |= IFF_IPV4;
 177
 178                 if (lifreq->lifr_addr.ss_family == AF_INET6) {
 179                         ifp->flags |= IFF_IPV6;
 180                 }
 181
 182                 if_add_update(ifp);
 183
 184                 interface_info_ioctl(ifp);
 185
 186                 /* If a logical interface pass the full name so it can be
 187                  * as a label on the address
 188                  */
 189                 if (*(lifreq->lifr_name + normallen) != '\0')
 190                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 191                                     lifreq->lifr_name);
 192                 else
 193                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 194                                     NULL);
 195
 196                 /* Poke the interface flags. Lets IFF_UP mangling kick in */
 197                 if_flags_update(ifp, ifp->flags);
 198
 199                 lifreq++;
 200         }
 201
 202 end:
 203         close(sock);
 204         XFREE(MTYPE_TMP, lifconf.lifc_buf);
 205         return ret;
 206 }
 207
 208 /* Get interface's index by ioctl. */
 209 static int if_get_index(struct interface *ifp)
 210 {
 211         int ret;
 212         struct lifreq lifreq;
 213
 214         lifreq_set_name(&lifreq, ifp->name);
 215
 216         if (ifp->flags & IFF_IPV4)
 217                 ret = AF_IOCTL(AF_INET, SIOCGLIFINDEX, (caddr_t)&lifreq);
 218         else if (ifp->flags & IFF_IPV6)
 219                 ret = AF_IOCTL(AF_INET6, SIOCGLIFINDEX, (caddr_t)&lifreq);
 220         else
 221                 ret = -1;
 222
 223         if (ret < 0) {
 224                 zlog_warn("SIOCGLIFINDEX(%s) failed", ifp->name);
 225                 return ret;
 226         }
 227
 228 /* OK we got interface index. */
 229 #ifdef ifr_ifindex
 230         if_set_index(ifp, lifreq.lifr_ifindex);
 231 #else
 232         if_set_index(ifp, lifreq.lifr_index);
 233 #endif
 234         return ifp->ifindex;
 235 }
 236
 237
 238 /* Interface address lookup by ioctl.  This function only looks up
 239    IPv4 address. */
 240 #define ADDRLEN(sa)                                                            \
 241         (((sa)->sa_family == AF_INET ? sizeof(struct sockaddr_in)              \
 242                                      : sizeof(struct sockaddr_in6)))
 243
 244 #define SIN(s) ((struct sockaddr_in *)(s))
 245 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 246
 247 /* Retrieve address information for the given ifp */
 248 static int if_get_addr(struct interface *ifp, struct sockaddr *addr,
 249                        const char *label)
 250 {
 251         int ret;
 252         struct lifreq lifreq;
 253         struct sockaddr_storage mask, dest;
 254         char *dest_pnt = NULL;
 255         u_char prefixlen = 0;
 256         afi_t af;
 257         int flags = 0;
 258
 259         /* Interface's name and address family.
 260          * We need to use the logical interface name / label, if we've been
 261          * given one, in order to get the right address
 262          */
 263         strncpy(lifreq.lifr_name, (label ? label : ifp->name), IFNAMSIZ);
 264
 265         /* Interface's address. */
 266         memcpy(&lifreq.lifr_addr, addr, ADDRLEN(addr));
 267         af = addr->sa_family;
 268
 269         /* Point to point or broad cast address pointer init. */
 270         dest_pnt = NULL;
 271
 272         if (AF_IOCTL(af, SIOCGLIFDSTADDR, (caddr_t)&lifreq) >= 0) {
 273                 memcpy(&dest, &lifreq.lifr_dstaddr, ADDRLEN(addr));
 274                 if (af == AF_INET)
 275                         dest_pnt = (char *)&(SIN(&dest)->sin_addr);
 276                 else
 277                         dest_pnt = (char *)&(SIN6(&dest)->sin6_addr);
 278                 flags = ZEBRA_IFA_PEER;
 279         }
 280
 281         if (af == AF_INET) {
 282                 ret = if_ioctl(SIOCGLIFNETMASK, (caddr_t)&lifreq);
 283
 284                 if (ret < 0) {
 285                         if (errno != EADDRNOTAVAIL) {
 286                                 zlog_warn("SIOCGLIFNETMASK (%s) fail: %s",
 287                                           ifp->name, safe_strerror(errno));
 288                                 return ret;
 289                         }
 290                         return 0;
 291                 }
 292                 memcpy(&mask, &lifreq.lifr_addr, ADDRLEN(addr));
 293
 294                 prefixlen = ip_masklen(SIN(&mask)->sin_addr);
 295                 if (!dest_pnt
 296                     && (if_ioctl(SIOCGLIFBRDADDR, (caddr_t)&lifreq) >= 0)) {
 297                         memcpy(&dest, &lifreq.lifr_broadaddr,
 298                                sizeof(struct sockaddr_in));
 299                         dest_pnt = (char *)&SIN(&dest)->sin_addr;
 300                 }
 301         } else if (af == AF_INET6) {
 302                 if (if_ioctl_ipv6(SIOCGLIFSUBNET, (caddr_t)&lifreq) < 0) {
 303                         if (ifp->flags & IFF_POINTOPOINT)
 304                                 prefixlen = IPV6_MAX_BITLEN;
 305                         else
 306                                 zlog_warn("SIOCGLIFSUBNET (%s) fail: %s",
 307                                           ifp->name, safe_strerror(errno));
 308                 } else {
 309                         prefixlen = lifreq.lifr_addrlen;
 310                 }
 311         }
 312
 313         /* Set address to the interface. */
 314         if (af == AF_INET)
 315                 connected_add_ipv4(ifp, flags, &SIN(addr)->sin_addr, prefixlen,
 316                                    (struct in_addr *)dest_pnt, label);
 317         else if (af == AF_INET6)
 318                 connected_add_ipv6(ifp, flags, &SIN6(addr)->sin6_addr,
 319                                    prefixlen, label);
 320
 321         return 0;
 322 }
 323
 324 /* Fetch interface information via ioctl(). */
 325 static void interface_info_ioctl(struct interface *ifp)
 326 {
 327         if_get_index(ifp);
 328         if_get_flags(ifp);
 329         if_get_mtu(ifp);
 330         if_get_metric(ifp);
 331 }
 332
 333 /* Lookup all interface information. */
 334 void interface_list(struct zebra_ns *zns)
 335 {
 336         if (zns->ns_id != NS_DEFAULT) {
 337                 zlog_warn("interface_list: ignore NS %u", zns->ns_id);
 338                 return;
 339         }
 340         interface_list_ioctl(AF_INET);
 341         interface_list_ioctl(AF_INET6);
 342         interface_list_ioctl(AF_UNSPEC);
 343 }
 344
 345 struct connected *if_lookup_linklocal(struct interface *ifp)
 346 {
 347         struct listnode *node;
 348         struct connected *ifc;
 349
 350         if (ifp == NULL)
 351                 return NULL;
 352
 353         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
 354                 if ((ifc->address->family == AF_INET6)
 355                     && (IN6_IS_ADDR_LINKLOCAL(&ifc->address->u.prefix6)))
 356                         return ifc;
 357         }
 358
 359         return NULL;
 360 }
 361
 362 #endif /* SUNOS_5 */