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 #include "if.h"
  25 #include "sockunion.h"
  26 #include "prefix.h"
  27 #include "ioctl.h"
  28 #include "connected.h"
  29 #include "memory.h"
  30 #include "zebra_memory.h"
  31 #include "log.h"
  32 #include "privs.h"
  33 #include "vrf.h"
  34 #include "vty.h"
  35
  36 #include "zebra/interface.h"
  37 #include "zebra/ioctl_solaris.h"
  38 #include "zebra/rib.h"
  39
  40 static int if_get_addr(struct interface *, struct sockaddr *, const char *);
  41 static void interface_info_ioctl(struct interface *);
  42 extern struct zebra_privs_t zserv_privs;
  43
  44 static int interface_list_ioctl(int af)
  45 {
  46         int ret;
  47         int sock;
  48 #define IFNUM_BASE 32
  49         struct lifnum lifn;
  50         int ifnum;
  51         struct lifreq *lifreq;
  52         struct lifconf lifconf;
  53         struct interface *ifp;
  54         int n;
  55         int save_errno;
  56         size_t needed, lastneeded = 0;
  57         char *buf = NULL;
  58
  59         if (zserv_privs.change(ZPRIVS_RAISE))
  60                 zlog_err("Can't raise privileges");
  61
  62         sock = socket(af, SOCK_DGRAM, 0);
  63         if (sock < 0) {
  64                 zlog_warn("Can't make %s socket stream: %s",
  65                           (af == AF_INET ? "AF_INET" : "AF_INET6"),
  66                           safe_strerror(errno));
  67
  68                 if (zserv_privs.change(ZPRIVS_LOWER))
  69                         zlog_err("Can't lower privileges");
  70
  71                 return -1;
  72         }
  73
  74 calculate_lifc_len: /* must hold privileges to enter here */
  75         lifn.lifn_family = af;
  76         lifn.lifn_flags = LIFC_NOXMIT; /* we want NOXMIT interfaces too */
  77         ret = ioctl(sock, SIOCGLIFNUM, &lifn);
  78         save_errno = errno;
  79
  80         if (zserv_privs.change(ZPRIVS_LOWER))
  81                 zlog_err("Can't lower privileges");
  82
  83         if (ret < 0) {
  84                 zlog_warn("interface_list_ioctl: SIOCGLIFNUM failed %s",
  85                           safe_strerror(save_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                 if ((buf = XMALLOC(MTYPE_TMP, needed)) == NULL) {
 102                         zlog_warn("interface_list_ioctl: malloc failed");
 103                         close(sock);
 104                         return -1;
 105                 }
 106         }
 107         lastneeded = needed;
 108
 109         lifconf.lifc_family = af;
 110         lifconf.lifc_flags = LIFC_NOXMIT;
 111         lifconf.lifc_len = needed;
 112         lifconf.lifc_buf = buf;
 113
 114         if (zserv_privs.change(ZPRIVS_RAISE))
 115                 zlog_err("Can't raise privileges");
 116
 117         ret = ioctl(sock, SIOCGLIFCONF, &lifconf);
 118
 119         if (ret < 0) {
 120                 if (errno == EINVAL)
 121                         goto calculate_lifc_len; /* deliberately hold privileges
 122                                                     */
 123
 124                 zlog_warn("SIOCGLIFCONF: %s", safe_strerror(errno));
 125
 126                 if (zserv_privs.change(ZPRIVS_LOWER))
 127                         zlog_err("Can't lower privileges");
 128
 129                 goto end;
 130         }
 131
 132         if (zserv_privs.change(ZPRIVS_LOWER))
 133                 zlog_err("Can't lower privileges");
 134
 135         /* Allocate interface. */
 136         lifreq = lifconf.lifc_req;
 137
 138         for (n = 0; n < lifconf.lifc_len; n += sizeof(struct lifreq)) {
 139                 /* we treat Solaris logical interfaces as addresses, because
 140                  * that is
 141                  * how PF_ROUTE on Solaris treats them. Hence we can not
 142                  * directly use
 143                  * the lifreq_name to get the ifp.  We need to normalise the
 144                  * name
 145                  * before attempting get.
 146                  *
 147                  * Solaris logical interface names are in the form of:
 148                  * <interface name>:<logical interface id>
 149                  */
 150                 unsigned int normallen = 0;
 151                 uint64_t lifflags;
 152
 153                 /* We should exclude ~IFF_UP interfaces, as we'll find out about
 154                  * them
 155                  * coming up later through RTM_NEWADDR message on the route
 156                  * socket.
 157                  */
 158                 if (if_get_flags_direct(lifreq->lifr_name, &lifflags,
 159                                         lifreq->lifr_addr.ss_family)
 160                     || !CHECK_FLAG(lifflags, IFF_UP)) {
 161                         lifreq++;
 162                         continue;
 163                 }
 164
 165                 /* Find the normalised name */
 166                 while ((normallen < sizeof(lifreq->lifr_name))
 167                        && (*(lifreq->lifr_name + normallen) != '\0')
 168                        && (*(lifreq->lifr_name + normallen) != ':'))
 169                         normallen++;
 170
 171                 ifp = if_get_by_name_len(lifreq->lifr_name, normallen,
 172                                          VRF_DEFAULT, 0);
 173
 174                 if (lifreq->lifr_addr.ss_family == AF_INET)
 175                         ifp->flags |= IFF_IPV4;
 176
 177                 if (lifreq->lifr_addr.ss_family == AF_INET6) {
 178                         ifp->flags |= IFF_IPV6;
 179                 }
 180
 181                 if_add_update(ifp);
 182
 183                 interface_info_ioctl(ifp);
 184
 185                 /* If a logical interface pass the full name so it can be
 186                  * as a label on the address
 187                  */
 188                 if (*(lifreq->lifr_name + normallen) != '\0')
 189                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 190                                     lifreq->lifr_name);
 191                 else
 192                         if_get_addr(ifp, (struct sockaddr *)&lifreq->lifr_addr,
 193                                     NULL);
 194
 195                 /* Poke the interface flags. Lets IFF_UP mangling kick in */
 196                 if_flags_update(ifp, ifp->flags);
 197
 198                 lifreq++;
 199         }
 200
 201 end:
 202         close(sock);
 203         XFREE(MTYPE_TMP, lifconf.lifc_buf);
 204         return ret;
 205 }
 206
 207 /* Get interface's index by ioctl. */
 208 static int if_get_index(struct interface *ifp)
 209 {
 210         int ret;
 211         struct lifreq lifreq;
 212
 213         lifreq_set_name(&lifreq, ifp->name);
 214
 215         if (ifp->flags & IFF_IPV4)
 216                 ret = AF_IOCTL(AF_INET, SIOCGLIFINDEX, (caddr_t)&lifreq);
 217         else if (ifp->flags & IFF_IPV6)
 218                 ret = AF_IOCTL(AF_INET6, SIOCGLIFINDEX, (caddr_t)&lifreq);
 219         else
 220                 ret = -1;
 221
 222         if (ret < 0) {
 223                 zlog_warn("SIOCGLIFINDEX(%s) failed", ifp->name);
 224                 return ret;
 225         }
 226
 227 /* OK we got interface index. */
 228 #ifdef ifr_ifindex
 229         ifp->ifindex = lifreq.lifr_ifindex;
 230 #else
 231         ifp->ifindex = lifreq.lifr_index;
 232 #endif
 233         return ifp->ifindex;
 234 }
 235
 236
 237 /* Interface address lookup by ioctl.  This function only looks up
 238    IPv4 address. */
 239 #define ADDRLEN(sa)                                                            \
 240         (((sa)->sa_family == AF_INET ? sizeof(struct sockaddr_in)              \
 241                                      : sizeof(struct sockaddr_in6)))
 242
 243 #define SIN(s) ((struct sockaddr_in *)(s))
 244 #define SIN6(s) ((struct sockaddr_in6 *)(s))
 245
 246 /* Retrieve address information for the given ifp */
 247 static int if_get_addr(struct interface *ifp, struct sockaddr *addr,
 248                        const char *label)
 249 {
 250         int ret;
 251         struct lifreq lifreq;
 252         struct sockaddr_storage mask, dest;
 253         char *dest_pnt = NULL;
 254         u_char prefixlen = 0;
 255         afi_t af;
 256         int flags = 0;
 257
 258         /* Interface's name and address family.
 259          * We need to use the logical interface name / label, if we've been
 260          * given one, in order to get the right address
 261          */
 262         strncpy(lifreq.lifr_name, (label ? label : ifp->name), IFNAMSIZ);
 263
 264         /* Interface's address. */
 265         memcpy(&lifreq.lifr_addr, addr, ADDRLEN(addr));
 266         af = addr->sa_family;
 267
 268         /* Point to point or broad cast address pointer init. */
 269         dest_pnt = NULL;
 270
 271         if (AF_IOCTL(af, SIOCGLIFDSTADDR, (caddr_t)&lifreq) >= 0) {
 272                 memcpy(&dest, &lifreq.lifr_dstaddr, ADDRLEN(addr));
 273                 if (af == AF_INET)
 274                         dest_pnt = (char *)&(SIN(&dest)->sin_addr);
 275                 else
 276                         dest_pnt = (char *)&(SIN6(&dest)->sin6_addr);
 277                 flags = ZEBRA_IFA_PEER;
 278         }
 279
 280         if (af == AF_INET) {
 281                 ret = if_ioctl(SIOCGLIFNETMASK, (caddr_t)&lifreq);
 282
 283                 if (ret < 0) {
 284                         if (errno != EADDRNOTAVAIL) {
 285                                 zlog_warn("SIOCGLIFNETMASK (%s) fail: %s",
 286                                           ifp->name, safe_strerror(errno));
 287                                 return ret;
 288                         }
 289                         return 0;
 290                 }
 291                 memcpy(&mask, &lifreq.lifr_addr, ADDRLEN(addr));
 292
 293                 prefixlen = ip_masklen(SIN(&mask)->sin_addr);
 294                 if (!dest_pnt
 295                     && (if_ioctl(SIOCGLIFBRDADDR, (caddr_t)&lifreq) >= 0)) {
 296                         memcpy(&dest, &lifreq.lifr_broadaddr,
 297                                sizeof(struct sockaddr_in));
 298                         dest_pnt = (char *)&SIN(&dest)->sin_addr;
 299                 }
 300         } else if (af == AF_INET6) {
 301                 if (if_ioctl_ipv6(SIOCGLIFSUBNET, (caddr_t)&lifreq) < 0) {
 302                         if (ifp->flags & IFF_POINTOPOINT)
 303                                 prefixlen = IPV6_MAX_BITLEN;
 304                         else
 305                                 zlog_warn("SIOCGLIFSUBNET (%s) fail: %s",
 306                                           ifp->name, safe_strerror(errno));
 307                 } else {
 308                         prefixlen = lifreq.lifr_addrlen;
 309                 }
 310         }
 311
 312         /* Set address to the interface. */
 313         if (af == AF_INET)
 314                 connected_add_ipv4(ifp, flags, &SIN(addr)->sin_addr, prefixlen,
 315                                    (struct in_addr *)dest_pnt, label);
 316         else if (af == AF_INET6)
 317                 connected_add_ipv6(ifp, flags, &SIN6(addr)->sin6_addr,
 318                                    prefixlen, (struct in6_addr *)dest_pnt,
 319                                    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 }