usr/src/lib/libipadm/common/ipadm_ngz.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <errno.h>
  26 #include <fcntl.h>
  27 #include <priv_utils.h>
  28 #include <signal.h>
  29 #include <stdlib.h>
  30 #include <stdio.h>
  31 #include <strings.h>
  32 #include <sys/param.h>
  33 #include <sys/stat.h>
  34 #include <unistd.h>
  35 #include <zone.h>
  36 #include <libipadm.h>
  37 #include <libdladm.h>
  38 #include <libdllink.h>
  39 #include <net/route.h>
  40 #include <netinet/in.h>
  41 #include <net/route.h>
  42 #include <errno.h>
  43 #include <inet/ip.h>
  44 #include <string.h>
  45 #include <libinetutil.h>
  46 #include <unistd.h>
  47 #include <libipadm_impl.h>
  48 #include <sys/brand.h>
  49
  50 #define ROUNDUP_LONG(a) \
  51         ((a) > 0 ? (1 + (((a) - 1) | (sizeof (long) - 1))) : sizeof (long))
  52 #define HOST_MASK       0xffffffffU
  53
  54 typedef struct ngz_walk_data_s {
  55         ipadm_handle_t  ngz_iph;
  56         zoneid_t        ngz_zoneid;
  57         char            *ngz_ifname;
  58         boolean_t       ngz_s10c;
  59         ipadm_status_t  ngz_ipstatus;
  60         persist_cb_t    ngz_persist_if;
  61 } ngz_walk_data_t;
  62
  63 /*
  64  * Tell the kernel to add, delete or change a route
  65  */
  66 static void
  67 i_ipadm_rtioctl4(int rtsock,
  68     int action,                 /* RTM_DELETE, etc */
  69     in_addr_t dst,
  70     in_addr_t gate,
  71     uint_t masklen,
  72     char *ifname,
  73     uint8_t metric,
  74     int flags)
  75 {
  76         static int rt_sock_seqno = 0;
  77         struct {
  78                 struct rt_msghdr w_rtm;
  79                 struct sockaddr_in w_dst;
  80                 struct sockaddr_in w_gate;
  81                 uint8_t w_space[512];
  82         } w;
  83         struct sockaddr_in w_mask;
  84         struct sockaddr_dl w_ifp;
  85         uint8_t *cp;
  86         long cc;
  87
  88 again:
  89         (void) memset(&w, 0, sizeof (w));
  90         (void) memset(&w_mask, 0, sizeof (w_mask));
  91         (void) memset(&w_ifp, 0, sizeof (w_ifp));
  92         cp = w.w_space;
  93         w.w_rtm.rtm_msglen = sizeof (struct rt_msghdr) +
  94             2 * ROUNDUP_LONG(sizeof (struct sockaddr_in));
  95         w.w_rtm.rtm_version = RTM_VERSION;
  96         w.w_rtm.rtm_type = action;
  97         w.w_rtm.rtm_flags = (flags | RTF_ZONE);
  98         w.w_rtm.rtm_seq = ++rt_sock_seqno;
  99         w.w_rtm.rtm_addrs = RTA_DST|RTA_GATEWAY;
 100         if (metric != 0 || action == RTM_CHANGE) {
 101                 w.w_rtm.rtm_rmx.rmx_hopcount = metric;
 102                 w.w_rtm.rtm_inits |= RTV_HOPCOUNT;
 103         }
 104         w.w_dst.sin_family = AF_INET;
 105         w.w_dst.sin_addr.s_addr = dst;
 106         w.w_gate.sin_family = AF_INET;
 107         w.w_gate.sin_addr.s_addr = gate;
 108         if (masklen == HOST_MASK) {
 109                 w.w_rtm.rtm_flags |= RTF_HOST;
 110         } else {
 111                 struct sockaddr_storage m4;
 112
 113                 w.w_rtm.rtm_addrs |= RTA_NETMASK;
 114                 w_mask.sin_family = AF_INET;
 115                 if (plen2mask(masklen, AF_INET, (struct sockaddr *)&m4) != 0) {
 116                         return;
 117                 }
 118                 w_mask.sin_addr = ((struct sockaddr_in *)&m4)->sin_addr;
 119                 (void) memmove(cp, &w_mask, sizeof (w_mask));
 120                 cp += ROUNDUP_LONG(sizeof (struct sockaddr_in));
 121                 w.w_rtm.rtm_msglen += ROUNDUP_LONG(sizeof (struct sockaddr_in));
 122         }
 123         w_ifp.sdl_family = AF_LINK;
 124         w.w_rtm.rtm_addrs |= RTA_IFP;
 125         w_ifp.sdl_index = if_nametoindex(ifname);
 126         (void) memmove(cp, &w_ifp, sizeof (w_ifp));
 127         w.w_rtm.rtm_msglen += ROUNDUP_LONG(sizeof (struct sockaddr_dl));
 128
 129         cc = write(rtsock, &w, w.w_rtm.rtm_msglen);
 130         if (cc < 0) {
 131                 if (errno == ESRCH && (action == RTM_CHANGE ||
 132                     action == RTM_DELETE)) {
 133                         if (action == RTM_CHANGE) {
 134                                 action = RTM_ADD;
 135                                 goto again;
 136                         }
 137                         return;
 138                 }
 139                 return;
 140         } else if (cc != w.w_rtm.rtm_msglen) {
 141                 return;
 142         }
 143 }
 144
 145 static void
 146 i_ipadm_rtioctl6(int rtsock,
 147     int action,                 /* RTM_DELETE, etc */
 148     in6_addr_t dst,
 149     in6_addr_t gate,
 150     uint_t prefix_length,
 151     char *ifname,
 152     int flags)
 153 {
 154         static int rt_sock_seqno = 0;
 155         struct {
 156                 struct rt_msghdr w_rtm;
 157                 struct sockaddr_in6 w_dst;
 158                 struct sockaddr_in6 w_gate;
 159                 uint8_t w_space[512];
 160         } w;
 161         struct sockaddr_in6 w_mask;
 162         struct sockaddr_dl w_ifp;
 163         uint8_t *cp;
 164         long cc;
 165
 166 again:
 167         (void) memset(&w, 0, sizeof (w));
 168         (void) memset(&w_mask, 0, sizeof (w_mask));
 169         (void) memset(&w_ifp, 0, sizeof (w_ifp));
 170         cp = w.w_space;
 171         w.w_rtm.rtm_msglen = sizeof (struct rt_msghdr) +
 172             2 * ROUNDUP_LONG(sizeof (struct sockaddr_in6));
 173         w.w_rtm.rtm_version = RTM_VERSION;
 174         w.w_rtm.rtm_type = action;
 175         w.w_rtm.rtm_flags = (flags | RTF_ZONE);
 176         w.w_rtm.rtm_seq = ++rt_sock_seqno;
 177         w.w_rtm.rtm_addrs = RTA_DST|RTA_GATEWAY;
 178         w.w_dst.sin6_family = AF_INET6;
 179         w.w_dst.sin6_addr = dst;
 180         w.w_gate.sin6_family = AF_INET6;
 181         w.w_gate.sin6_addr = gate;
 182         if (prefix_length == IPV6_ABITS) {
 183                 w.w_rtm.rtm_flags |= RTF_HOST;
 184         } else {
 185                 struct sockaddr_storage m6;
 186
 187                 w.w_rtm.rtm_addrs |= RTA_NETMASK;
 188                 w_mask.sin6_family = AF_INET6;
 189                 if (plen2mask(prefix_length, AF_INET6,
 190                     (struct sockaddr *)&m6) != 0) {
 191                         return;
 192                 }
 193                 w_mask.sin6_addr = ((struct sockaddr_in6 *)&m6)->sin6_addr;
 194                 (void) memmove(cp, &w_mask, sizeof (w_mask));
 195                 cp += ROUNDUP_LONG(sizeof (struct sockaddr_in6));
 196                 w.w_rtm.rtm_msglen +=
 197                     ROUNDUP_LONG(sizeof (struct sockaddr_in6));
 198         }
 199         w_ifp.sdl_family = AF_LINK;
 200         w.w_rtm.rtm_addrs |= RTA_IFP;
 201         w_ifp.sdl_index = if_nametoindex(ifname);
 202         (void) memmove(cp, &w_ifp, sizeof (w_ifp));
 203         w.w_rtm.rtm_msglen += ROUNDUP_LONG(sizeof (struct sockaddr_dl));
 204
 205         cc = write(rtsock, &w, w.w_rtm.rtm_msglen);
 206         if (cc < 0) {
 207                 if (errno == ESRCH && (action == RTM_CHANGE ||
 208                     action == RTM_DELETE)) {
 209                         if (action == RTM_CHANGE) {
 210                                 action = RTM_ADD;
 211                                 goto again;
 212                         }
 213                         return;
 214                 }
 215                 return;
 216         } else if (cc != w.w_rtm.rtm_msglen) {
 217                 return;
 218         }
 219 }
 220
 221 /*
 222  * Return TRUE if running in a Solaris 10 Container.
 223  */
 224 static boolean_t
 225 i_ipadm_zone_is_s10c(zoneid_t zoneid)
 226 {
 227         char brand[MAXNAMELEN];
 228
 229         if (zone_getattr(zoneid, ZONE_ATTR_BRAND, brand, sizeof (brand)) < 0)
 230                 return (B_FALSE);
 231         return (strcmp(brand, NATIVE_BRAND_NAME) != 0);
 232 }
 233
 234 /*
 235  * Configure addresses on link. `buf' is a string of comma-separated
 236  * IP addresses.
 237  */
 238 static ipadm_status_t
 239 i_ipadm_ngz_addr(ipadm_handle_t iph, char *link, char *buf)
 240 {
 241         ipadm_status_t ipstatus;
 242         ipadm_addrobj_t ipaddr;
 243         char *cp;
 244
 245         for (cp = strtok(buf, ","); cp != NULL; cp = strtok(NULL, ",")) {
 246                 ipstatus = ipadm_create_addrobj(IPADM_ADDR_STATIC, link,
 247                     &ipaddr);
 248                 if (ipstatus != IPADM_SUCCESS)
 249                         return (ipstatus);
 250                 /*
 251                  * ipadm_set_addr does the appropriate name resolution and
 252                  * sets up the ipadm_static_addr field.
 253                  */
 254                 ipstatus = ipadm_set_addr(ipaddr, cp, AF_UNSPEC);
 255                 if (ipstatus != IPADM_SUCCESS) {
 256                         ipadm_destroy_addrobj(ipaddr);
 257                         return (ipstatus);
 258                 }
 259
 260                 ipstatus = ipadm_create_addr(iph, ipaddr,
 261                     (IPADM_OPT_ACTIVE | IPADM_OPT_UP));
 262                 if (ipstatus != IPADM_SUCCESS) {
 263                         ipadm_destroy_addrobj(ipaddr);
 264                         return (ipstatus);
 265                 }
 266                 ipadm_destroy_addrobj(ipaddr);
 267         }
 268         return (IPADM_SUCCESS);
 269 }
 270
 271 /*
 272  * The (*persist_if)() will set up persistent information for the interface,
 273  * based on what interface families are required, so just resolve the
 274  * address and inform the callback about the linkname, and required address
 275  * families.
 276  */
 277 static ipadm_status_t
 278 i_ipadm_ngz_persist_if(char *link, char *buf,
 279     void (*ngz_persist_if)(char *, boolean_t, boolean_t))
 280 {
 281         char *cp, *slashp, addr[INET6_ADDRSTRLEN];
 282         ipadm_status_t ipstatus;
 283         struct sockaddr_storage ss;
 284         boolean_t v4 = B_FALSE;
 285         boolean_t v6 = B_FALSE;
 286
 287         for (cp = strtok(buf, ","); cp != NULL; cp = strtok(NULL, ",")) {
 288                 /* remove the /<masklen> that's always added by zoneadmd */
 289                 slashp = strchr(cp, '/');
 290                 (void) strlcpy(addr, cp, (slashp - cp + 1));
 291
 292                 /* resolve the address to find the family */
 293                 bzero(&ss, sizeof (ss));
 294                 ipstatus = i_ipadm_resolve_addr(addr, AF_UNSPEC, &ss);
 295                 if (ipstatus != IPADM_SUCCESS)
 296                         return (ipstatus);
 297                 switch (ss.ss_family) {
 298                 case AF_INET:
 299                         v4 = B_TRUE;
 300                         break;
 301                 case AF_INET6:
 302                         v6 = B_TRUE;
 303                         break;
 304                 default:
 305                         return (IPADM_BAD_ADDR);
 306                 }
 307         }
 308         (*ngz_persist_if)(link, v4, v6);
 309         return (IPADM_SUCCESS);
 310 }
 311
 312 static void
 313 i_ipadm_create_ngz_route(int rtsock, char *link, uint8_t *buf, size_t buflen)
 314 {
 315         struct in6_addr defrouter;
 316         boolean_t isv6;
 317         struct in_addr gw4;
 318         uint8_t *cp;
 319         const in6_addr_t ipv6_all_zeros = { { { 0, 0, 0, 0, 0, 0, 0, 0,
 320                                                 0, 0, 0, 0, 0, 0, 0, 0 } } };
 321
 322         if (rtsock == -1)
 323                 return;
 324
 325         for (cp = buf; cp < buf + buflen; cp += sizeof (defrouter)) {
 326                 bcopy(cp, &defrouter, sizeof (defrouter));
 327                 if (IN6_IS_ADDR_UNSPECIFIED(&defrouter))
 328                         break;
 329                 isv6 = !IN6_IS_ADDR_V4MAPPED(&defrouter);
 330                 if (isv6) {
 331                         i_ipadm_rtioctl6(rtsock, RTM_ADD, ipv6_all_zeros,
 332                             defrouter, 0, link, RTF_GATEWAY);
 333                 } else {
 334                         IN6_V4MAPPED_TO_INADDR(&defrouter, &gw4);
 335                         i_ipadm_rtioctl4(rtsock, RTM_ADD, INADDR_ANY,
 336                             gw4.s_addr, 0, link, 0, RTF_GATEWAY);
 337                 }
 338         }
 339 }
 340
 341 /*
 342  * Wrapper function to zone_getattr() for retrieving from-gz attributes that
 343  * were made availabe for exclusive IP non-global zones by zoneadmd from teh
 344  * global zone.
 345  */
 346 static ipadm_status_t
 347 i_ipadm_zone_get_network(zoneid_t zoneid, datalink_id_t linkid, int type,
 348     void *buf, size_t *bufsize)
 349 {
 350         zone_net_data_t *zndata;
 351
 352         zndata = calloc(1, sizeof (*zndata) + *bufsize);
 353         if (zndata == NULL)
 354                 return (IPADM_NO_MEMORY);
 355         zndata->zn_type = type;
 356         zndata->zn_linkid = linkid;
 357         zndata->zn_len = *bufsize;
 358
 359         if (zone_getattr(zoneid, ZONE_ATTR_NETWORK, zndata,
 360             sizeof (*zndata) + *bufsize) < 0) {
 361                 return (ipadm_errno2status(errno));
 362         }
 363         *bufsize = zndata->zn_len;
 364         bcopy(zndata->zn_val, buf, *bufsize);
 365         return (IPADM_SUCCESS);
 366 }
 367
 368 /*
 369  * Callback function that configures a single datalink in a non-global zone.
 370  */
 371 static int
 372 i_ipadm_zone_network_attr(dladm_handle_t dh, datalink_id_t linkid, void *arg)
 373 {
 374         ngz_walk_data_t *nwd = arg;
 375         zoneid_t zoneid = nwd->ngz_zoneid;
 376         uint8_t buf[PIPE_BUF];
 377         dladm_status_t dlstatus;
 378         ipadm_status_t ipstatus;
 379         char link[MAXLINKNAMELEN];
 380         ipadm_handle_t iph = nwd->ngz_iph;
 381         int rtsock = iph->iph_rtsock;
 382         char *ifname = nwd->ngz_ifname;
 383         boolean_t s10c = nwd->ngz_s10c;
 384         boolean_t is_ipmgmtd = (iph->iph_flags & IPH_IPMGMTD);
 385         size_t bufsize = sizeof (buf);
 386
 387         bzero(buf, bufsize);
 388         ipstatus = i_ipadm_zone_get_network(zoneid, linkid,
 389             ZONE_NETWORK_ADDRESS, buf, &bufsize);
 390         if (ipstatus != IPADM_SUCCESS)
 391                 goto fail;
 392
 393         dlstatus = dladm_datalink_id2info(dh, linkid, NULL, NULL,
 394             NULL, link, sizeof (link));
 395         if (dlstatus != DLADM_STATUS_OK)
 396                 return (DLADM_WALK_CONTINUE);
 397
 398         /*
 399          * if ifname has been specified, then skip interfaces that don't match
 400          */
 401         if (ifname != NULL && strcmp(ifname, link) != 0)
 402                 return (DLADM_WALK_CONTINUE);
 403
 404         /*
 405          * Plumb the interface and configure addresses on for S10 Containers.
 406          * We need to always do this for S10C because ipadm persistent
 407          * configuration is not available in S10C. For ipkg zones,
 408          * we skip the actual plumbing/configuration, but will call the
 409          * (*ngz_persist_if)() callback to create the persistent state for the
 410          * interface. The interface will be configured in ipkg zones when
 411          * ipadm_enable_if() is invoked to restore persistent configuration.
 412          */
 413         if (is_ipmgmtd && !s10c) {
 414                 (void) i_ipadm_ngz_persist_if(link, (char *)buf,
 415                     nwd->ngz_persist_if);
 416                 return (DLADM_WALK_CONTINUE);
 417         }
 418         ipstatus = i_ipadm_ngz_addr(iph, link, (char *)buf);
 419         if (ipstatus != IPADM_SUCCESS)
 420                 goto fail;
 421
 422         /* apply any default router information.  */
 423         bufsize = sizeof (buf);
 424         bzero(buf, bufsize);
 425         ipstatus = i_ipadm_zone_get_network(zoneid, linkid,
 426             ZONE_NETWORK_DEFROUTER, buf, &bufsize);
 427         if (ipstatus != IPADM_SUCCESS)
 428                 goto fail;
 429
 430         i_ipadm_create_ngz_route(rtsock, link, buf, bufsize);
 431
 432         return (DLADM_WALK_CONTINUE);
 433 fail:
 434         if (ifname != NULL) {
 435                 nwd->ngz_ipstatus = ipstatus;
 436                 return (DLADM_WALK_TERMINATE);
 437         }
 438         return (DLADM_WALK_CONTINUE);
 439 }
 440
 441 /*
 442  * ipmgmt_net_from_gz_init() initializes exclusive-IP stack non-global zones by
 443  * extracting configuration that has been saved in the kernel and applying
 444  * that information to the appropriate datalinks for the zone. If an ifname
 445  * argument is passed in, only the selected IP interface corresponding to
 446  * datalink will be initialized, otherwise all datalinks will be plumbed for IP
 447  * and IP address and route information will be configured.
 448  */
 449 ipadm_status_t
 450 ipadm_init_net_from_gz(ipadm_handle_t iph, char *ifname,
 451         void (*persist_if)(char *, boolean_t, boolean_t))
 452 {
 453         ngz_walk_data_t nwd;
 454         uint64_t flags;
 455         dladm_handle_t dlh = iph->iph_dlh;
 456         datalink_id_t linkid;
 457
 458         if (iph->iph_zoneid == GLOBAL_ZONEID)
 459                 return (IPADM_NOTSUP);
 460
 461         if (ifname != NULL &&
 462             i_ipadm_get_flags(iph, ifname, AF_INET, &flags) != IPADM_SUCCESS &&
 463             i_ipadm_get_flags(iph, ifname, AF_INET6, &flags) != IPADM_SUCCESS)
 464                 return (IPADM_ENXIO);
 465
 466         if (ifname != NULL && !(flags & IFF_L3PROTECT))
 467                 return (IPADM_SUCCESS); /* nothing to initialize */
 468
 469         nwd.ngz_iph = iph;
 470         nwd.ngz_zoneid = iph->iph_zoneid;
 471         nwd.ngz_ifname = ifname;
 472         nwd.ngz_persist_if = persist_if;
 473         nwd.ngz_s10c = i_ipadm_zone_is_s10c(iph->iph_zoneid);
 474         nwd.ngz_ipstatus = IPADM_SUCCESS;
 475         if (ifname != NULL) {
 476                 if (dladm_name2info(dlh, ifname, &linkid, NULL, NULL,
 477                     NULL) != DLADM_STATUS_OK) {
 478                         return (IPADM_ENXIO);
 479                 }
 480                 (void) i_ipadm_zone_network_attr(dlh, linkid, &nwd);
 481         } else {
 482                 (void) dladm_walk_datalink_id(i_ipadm_zone_network_attr, dlh,
 483                     &nwd, DATALINK_CLASS_ALL, DATALINK_ANY_MEDIATYPE,
 484                     DLADM_OPT_PERSIST);
 485         }
 486         return (nwd.ngz_ipstatus);
 487 }