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                 buf = XMALLOC(MTYPE_TMP, needed);
 104         }
 105         lastneeded = needed;
 106
 107         lifconf.lifc_family = af;
 108         lifconf.lifc_flags = LIFC_NOXMIT;
 109         lifconf.lifc_len = needed;
 110         lifconf.lifc_buf = buf;
 111
 112         if (zserv_privs.change(ZPRIVS_RAISE))
 113                 zlog_err("Can't raise privileges");
 114
 115         ret = ioctl(sock, SIOCGLIFCONF, &lifconf);
 116
 117         if (ret < 0) {
 118                 if (errno == EINVAL)
 119                         goto calculate_lifc_len; /* deliberately hold privileges
 120                                                     */
 121
 122                 zlog_warn("SIOCGLIFCONF: %s", safe_strerror(errno));
 123
 124                 if (zserv_privs.change(ZPRIVS_LOWER))
 125                         zlog_err("Can't lower privileges");
 126
 127                 goto end;
 128         }
 129
 130         if (zserv_privs.change(ZPRIVS_LOWER))
 131                 zlog_err("Can't lower privileges");
 132
 133         /* Allocate interface. */
 134         lifreq = lifconf.lifc_req;
 135
 136         for (n = 0; n < lifconf.lifc_len; n += sizeof(struct lifreq)) {
 137                 /* we treat Solaris logical interfaces as addresses, because
 138                  * that is
 139                  * how PF_ROUTE on Solaris treats them. Hence we can not
 140                  * directly use
 141                  * the lifreq_name to get the ifp.  We need to normalise the
 142                  * name
 143                  * before attempting get.
 144                  *
 145                  * Solaris logical interface names are in the form of:
 146                  * <interface name>:<logical interface id>
 147                  */
 148                 unsigned int normallen = 0;
 149                 uint64_t lifflags;
 150
 151                 /* We should exclude ~IFF_UP interfaces, as we'll find out about
 152                  * them
 153                  * coming up later through RTM_NEWADDR message on the route
 154                  * 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                         lifreq++;
 160                         continue;
 161                 }
 162
 163                 /* Find the normalised name */
 164                 while ((normallen < sizeof(lifreq->lifr_name))
 165                        && (*(lifreq->lifr_name + normallen) != '\0')
 166                        && (*(lifreq->lifr_name + normallen) != ':'))
 167                         normallen++;
 168
 169                 ifp = if_get_by_name(lifreq->lifr_name, VRF_DEFAULT, 0);
 170
 171                 if (lifreq->lifr_addr.ss_family == AF_INET)
 172                         ifp->flags |= IFF_IPV4;
 173
 174                 if (lifreq->lifr_addr.ss_family == AF_INET6) {
 175                         ifp->flags |= IFF_IPV6;
 176                 }
 177
 178                 if_add_update(ifp);
 179
 180                 interface_info_ioctl(ifp);
 181
 182                 /* If a logical interface pass the full name so it can be
 183                  * as a label on the address
 184                  */
 185                 if (*(lifreq->lifr_name + normallen) != '\0')
 186                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 187                                     lifreq->lifr_name);
 188                 else
 189                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 190                                     NULL);
 191
 192                 /* Poke the interface flags. Lets IFF_UP mangling kick in */
 193                 if_flags_update(ifp, ifp->flags);
 194
 195                 lifreq++;
 196         }
 197
 198 end:
 199         close(sock);
 200         XFREE(MTYPE_TMP, lifconf.lifc_buf);
 201         return ret;
 202 }
 203
 204 /* Get interface's index by ioctl. */
 205 static int if_get_index(struct interface *ifp)
 206 {
 207         int ret;
 208         struct lifreq lifreq;
 209
 210         lifreq_set_name(&lifreq, ifp->name);
 211
 212         if (ifp->flags & IFF_IPV4)
 213                 ret = AF_IOCTL(AF_INET, SIOCGLIFINDEX, (caddr_t)&lifreq);
 214         else if (ifp->flags & IFF_IPV6)
 215                 ret = AF_IOCTL(AF_INET6, SIOCGLIFINDEX, (caddr_t)&lifreq);
 216         else
 217                 ret = -1;
 218
 219         if (ret < 0) {
 220                 zlog_warn("SIOCGLIFINDEX(%s) failed", ifp->name);
 221                 return ret;
 222         }
 223
 224 /* OK we got interface index. */
 225 #ifdef ifr_ifindex
 226         if_set_index(ifp, lifreq.lifr_ifindex);
 227 #else
 228         if_set_index(ifp, lifreq.lifr_index);
 229 #endif
 230         return ifp->ifindex;
 231 }
 232
 233
 234 /* Interface address lookup by ioctl.  This function only looks up
 235    IPv4 address. */
 236 #define ADDRLEN(sa)                                                            \
 237         (((sa)->sa_family == AF_INET ? sizeof(struct sockaddr_in)              \
 238                                      : sizeof(struct sockaddr_in6)))
 239
 240 #define SIN(s) ((struct sockaddr_in *)(s))
 241 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 242
 243 /* Retrieve address information for the given ifp */
 244 static int if_get_addr(struct interface *ifp, struct sockaddr *addr,
 245                        const char *label)
 246 {
 247         int ret;
 248         struct lifreq lifreq;
 249         struct sockaddr_storage mask, dest;
 250         char *dest_pnt = NULL;
 251         uint8_t prefixlen = 0;
 252         afi_t af;
 253         int flags = 0;
 254
 255         /* Interface's name and address family.
 256          * We need to use the logical interface name / label, if we've been
 257          * given one, in order to get the right address
 258          */
 259         strncpy(lifreq.lifr_name, (label ? label : ifp->name), IFNAMSIZ);
 260
 261         /* Interface's address. */
 262         memcpy(&lifreq.lifr_addr, addr, ADDRLEN(addr));
 263         af = addr->sa_family;
 264
 265         /* Point to point or broad cast address pointer init. */
 266         dest_pnt = NULL;
 267
 268         if (AF_IOCTL(af, SIOCGLIFDSTADDR, (caddr_t)&lifreq) >= 0) {
 269                 memcpy(&dest, &lifreq.lifr_dstaddr, ADDRLEN(addr));
 270                 if (af == AF_INET)
 271                         dest_pnt = (char *)&(SIN(&dest)->sin_addr);
 272                 else
 273                         dest_pnt = (char *)&(SIN6(&dest)->sin6_addr);
 274                 flags = ZEBRA_IFA_PEER;
 275         }
 276
 277         if (af == AF_INET) {
 278                 ret = if_ioctl(SIOCGLIFNETMASK, (caddr_t)&lifreq);
 279
 280                 if (ret < 0) {
 281                         if (errno != EADDRNOTAVAIL) {
 282                                 zlog_warn("SIOCGLIFNETMASK (%s) fail: %s",
 283                                           ifp->name, safe_strerror(errno));
 284                                 return ret;
 285                         }
 286                         return 0;
 287                 }
 288                 memcpy(&mask, &lifreq.lifr_addr, ADDRLEN(addr));
 289
 290                 prefixlen = ip_masklen(SIN(&mask)->sin_addr);
 291                 if (!dest_pnt
 292                     && (if_ioctl(SIOCGLIFBRDADDR, (caddr_t)&lifreq) >= 0)) {
 293                         memcpy(&dest, &lifreq.lifr_broadaddr,
 294                                sizeof(struct sockaddr_in));
 295                         dest_pnt = (char *)&SIN(&dest)->sin_addr;
 296                 }
 297         } else if (af == AF_INET6) {
 298                 if (if_ioctl_ipv6(SIOCGLIFSUBNET, (caddr_t)&lifreq) < 0) {
 299                         if (ifp->flags & IFF_POINTOPOINT)
 300                                 prefixlen = IPV6_MAX_BITLEN;
 301                         else
 302                                 zlog_warn("SIOCGLIFSUBNET (%s) fail: %s",
 303                                           ifp->name, safe_strerror(errno));
 304                 } else {
 305                         prefixlen = lifreq.lifr_addrlen;
 306                 }
 307         }
 308
 309         /* Set address to the interface. */
 310         if (af == AF_INET)
 311                 connected_add_ipv4(ifp, flags, &SIN(addr)->sin_addr, prefixlen,
 312                                    (struct in_addr *)dest_pnt, label);
 313         else if (af == AF_INET6)
 314                 connected_add_ipv6(ifp, flags, &SIN6(addr)->sin6_addr, NULL,
 315                                    prefixlen, label);
 316
 317         return 0;
 318 }
 319
 320 /* Fetch interface information via ioctl(). */
 321 static void interface_info_ioctl(struct interface *ifp)
 322 {
 323         if_get_index(ifp);
 324         if_get_flags(ifp);
 325         if_get_mtu(ifp);
 326         if_get_metric(ifp);
 327 }
 328
 329 /* Lookup all interface information. */
 330 void interface_list(struct zebra_ns *zns)
 331 {
 332         if (zns->ns_id != NS_DEFAULT) {
 333                 zlog_warn("interface_list: ignore NS %u", zns->ns_id);
 334                 return;
 335         }
 336         interface_list_ioctl(AF_INET);
 337         interface_list_ioctl(AF_INET6);
 338         interface_list_ioctl(AF_UNSPEC);
 339 }
 340
 341 struct connected *if_lookup_linklocal(struct interface *ifp)
 342 {
 343         struct listnode *node;
 344         struct connected *ifc;
 345
 346         if (ifp == NULL)
 347                 return NULL;
 348
 349         for (ALL_LIST_ELEMENTS_RO(ifp->connected, node, ifc)) {
 350                 if ((ifc->address->family == AF_INET6)
 351                     && (IN6_IS_ADDR_LINKLOCAL(&ifc->address->u.prefix6)))
 352                         return ifc;
 353         }
 354
 355         return NULL;
 356 }
 357
 358 #endif /* SUNOS_5 */