ip/xfrm_policy.c

   1 /* $USAGI: $ */
   2
   3 /*
   4  * Copyright (C)2004 USAGI/WIDE Project
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 /*
  21  * based on iproute.c
  22  */
  23 /*
  24  * Authors:
  25  *      Masahide NAKAMURA @USAGI
  26  */
  27
  28 #include <stdio.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <netdb.h>
  32 #include <linux/netlink.h>
  33 #include <linux/xfrm.h>
  34 #include "utils.h"
  35 #include "xfrm.h"
  36 #include "ip_common.h"
  37
  38 //#define NLMSG_FLUSH_BUF_SIZE (4096-512)
  39 #define NLMSG_FLUSH_BUF_SIZE 8192
  40
  41 /*
  42  * Receiving buffer defines:
  43  * nlmsg
  44  *   data = struct xfrm_userpolicy_info
  45  *   rtattr
  46  *     data = struct xfrm_user_tmpl[]
  47  */
  48 #define NLMSG_BUF_SIZE 4096
  49 #define RTA_BUF_SIZE 2048
  50 #define XFRM_TMPLS_BUF_SIZE 1024
  51
  52 static void usage(void) __attribute__((noreturn));
  53
  54 static void usage(void)
  55 {
  56         fprintf(stderr, "Usage: ip xfrm policy { add | update } dir DIR sel SELECTOR [ index INDEX ] \n");
  57         fprintf(stderr, "        [ action ACTION ] [ priority PRIORITY ] [ LIMIT-LIST ] [ TMPL-LIST ]\n");
  58         fprintf(stderr, "Usage: ip xfrm policy { delete | get } dir DIR [ sel SELECTOR | index INDEX ]\n");
  59         fprintf(stderr, "Usage: ip xfrm policy { flush | list } [ dir DIR ] [ sel SELECTOR ]\n");
  60         fprintf(stderr, "        [ index INDEX ] [ action ACTION ] [ priority PRIORITY ]\n");
  61         fprintf(stderr, "DIR := [ in | out | fwd ]\n");
  62
  63         fprintf(stderr, "SELECTOR := src ADDR[/PLEN] dst ADDR[/PLEN] [ upspec UPSPEC ] [ dev DEV ]\n");
  64
  65         fprintf(stderr, "UPSPEC := proto PROTO [ sport PORT ] [ dport PORT ]\n");
  66
  67         //fprintf(stderr, "DEV - device name(default=none)\n");
  68
  69         fprintf(stderr, "ACTION := [ allow | block ](default=allow)\n");
  70
  71         //fprintf(stderr, "PRIORITY - priority value(default=0)\n");
  72
  73         fprintf(stderr, "LIMIT-LIST := [ LIMIT-LIST ] | [ limit LIMIT ]\n");
  74         fprintf(stderr, "LIMIT := [ [time-soft|time-hard|time-use-soft|time-use-hard] SECONDS ] |\n");
  75         fprintf(stderr, "         [ [byte-soft|byte-hard] SIZE ] | [ [packet-soft|packet-hard] NUMBER ]\n");
  76
  77         fprintf(stderr, "TMPL-LIST := [ TMPL-LIST ] | [ tmpl TMPL ]\n");
  78         fprintf(stderr, "TMPL := ID [ mode MODE ] [ reqid REQID ] [ level LEVEL ]\n");
  79         fprintf(stderr, "ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM_PROTO ] [ spi SPI ]\n");
  80
  81         //fprintf(stderr, "XFRM_PROTO := [ esp | ah | ipcomp ]\n");
  82         fprintf(stderr, "XFRM_PROTO := [ ");
  83         fprintf(stderr, "%s | ", strxf_proto(IPPROTO_ESP));
  84         fprintf(stderr, "%s | ", strxf_proto(IPPROTO_AH));
  85         fprintf(stderr, "%s", strxf_proto(IPPROTO_COMP));
  86         fprintf(stderr, " ]\n");
  87
  88         fprintf(stderr, "MODE := [ transport | tunnel ](default=transport)\n");
  89         //fprintf(stderr, "REQID - number(default=0)\n");
  90         fprintf(stderr, "LEVEL := [ required | use ](default=required)\n");
  91
  92         exit(-1);
  93 }
  94
  95 static int xfrm_policy_dir_parse(__u8 *dir, int *argcp, char ***argvp)
  96 {
  97         int argc = *argcp;
  98         char **argv = *argvp;
  99
 100         if (strcmp(*argv, "in") == 0)
 101                 *dir = XFRM_POLICY_IN;
 102         else if (strcmp(*argv, "out") == 0)
 103                 *dir = XFRM_POLICY_OUT;
 104         else if (strcmp(*argv, "fwd") == 0)
 105                 *dir = XFRM_POLICY_FWD;
 106         else
 107                 invarg("\"DIR\" is invalid", *argv);
 108
 109         *argcp = argc;
 110         *argvp = argv;
 111
 112         return 0;
 113 }
 114
 115 static int xfrm_tmpl_parse(struct xfrm_user_tmpl *tmpl,
 116                            int *argcp, char ***argvp)
 117 {
 118         int argc = *argcp;
 119         char **argv = *argvp;
 120         char *idp = NULL;
 121
 122         while (1) {
 123                 if (strcmp(*argv, "mode") == 0) {
 124                         NEXT_ARG();
 125                         xfrm_mode_parse(&tmpl->mode,  &argc, &argv);
 126                 } else if (strcmp(*argv, "reqid") == 0) {
 127                         NEXT_ARG();
 128                         xfrm_reqid_parse(&tmpl->reqid, &argc, &argv);
 129                 } else if (strcmp(*argv, "level") == 0) {
 130                         NEXT_ARG();
 131
 132                         if (strcmp(*argv, "required") == 0)
 133                                 tmpl->optional = 0;
 134                         else if (strcmp(*argv, "use") == 0)
 135                                 tmpl->optional = 1;
 136                         else
 137                                 invarg("\"level\" value is invalid\n", *argv);
 138
 139                 } else {
 140                         if (idp) {
 141                                 PREV_ARG(); /* back track */
 142                                 break;
 143                         }
 144                         idp = *argv;
 145                         xfrm_id_parse(&tmpl->saddr, &tmpl->id, &tmpl->family,
 146                                       &argc, &argv);
 147                         if (preferred_family == AF_UNSPEC)
 148                                 preferred_family = tmpl->family;
 149                 }
 150
 151                 if (!NEXT_ARG_OK())
 152                         break;
 153
 154                 NEXT_ARG();
 155         }
 156         if (argc == *argcp)
 157                 missarg("TMPL");
 158
 159         *argcp = argc;
 160         *argvp = argv;
 161
 162         return 0;
 163 }
 164
 165 static int xfrm_policy_modify(int cmd, unsigned flags, int argc, char **argv)
 166 {
 167         struct rtnl_handle rth;
 168         struct {
 169                 struct nlmsghdr                 n;
 170                 struct xfrm_userpolicy_info     xpinfo;
 171                 char                            buf[RTA_BUF_SIZE];
 172         } req;
 173         char *dirp = NULL;
 174         char tmpls_buf[XFRM_TMPLS_BUF_SIZE];
 175         int tmpls_len = 0;
 176
 177         memset(&req, 0, sizeof(req));
 178         memset(&tmpls_buf, 0, sizeof(tmpls_buf));
 179
 180         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpinfo));
 181         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 182         req.n.nlmsg_type = cmd;
 183         req.xpinfo.sel.family = preferred_family;
 184
 185         req.xpinfo.lft.soft_byte_limit = XFRM_INF;
 186         req.xpinfo.lft.hard_byte_limit = XFRM_INF;
 187         req.xpinfo.lft.soft_packet_limit = XFRM_INF;
 188         req.xpinfo.lft.hard_packet_limit = XFRM_INF;
 189
 190         while (argc > 0) {
 191                 if (strcmp(*argv, "dir") == 0) {
 192                         if (dirp)
 193                                 duparg("dir", *argv);
 194                         dirp = *argv;
 195
 196                         NEXT_ARG();
 197                         xfrm_policy_dir_parse(&req.xpinfo.dir, &argc, &argv);
 198
 199                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 200
 201                 } else if (strcmp(*argv, "sel") == 0) {
 202                         NEXT_ARG();
 203                         xfrm_selector_parse(&req.xpinfo.sel, &argc, &argv);
 204                         if (preferred_family == AF_UNSPEC)
 205                                 preferred_family = req.xpinfo.sel.family;
 206
 207                 } else if (strcmp(*argv, "index") == 0) {
 208                         NEXT_ARG();
 209                         if (get_u32(&req.xpinfo.index, *argv, 0))
 210                                 invarg("\"INDEX\" is invalid", *argv);
 211
 212                         filter.index_mask = XFRM_FILTER_MASK_FULL;
 213
 214                 } else if (strcmp(*argv, "action") == 0) {
 215                         NEXT_ARG();
 216                         if (strcmp(*argv, "allow") == 0)
 217                                 req.xpinfo.action = XFRM_POLICY_ALLOW;
 218                         else if (strcmp(*argv, "block") == 0)
 219                                 req.xpinfo.action = XFRM_POLICY_BLOCK;
 220                         else
 221                                 invarg("\"action\" value is invalid\n", *argv);
 222
 223                         filter.action_mask = XFRM_FILTER_MASK_FULL;
 224
 225                 } else if (strcmp(*argv, "priority") == 0) {
 226                         NEXT_ARG();
 227                         if (get_u32(&req.xpinfo.priority, *argv, 0))
 228                                 invarg("\"PRIORITY\" is invalid", *argv);
 229
 230                         filter.priority_mask = XFRM_FILTER_MASK_FULL;
 231
 232                 } else if (strcmp(*argv, "limit") == 0) {
 233                         NEXT_ARG();
 234                         xfrm_lifetime_cfg_parse(&req.xpinfo.lft, &argc, &argv);
 235                 } else if (strcmp(*argv, "tmpl") == 0) {
 236                         struct xfrm_user_tmpl *tmpl;
 237
 238                         if (tmpls_len + sizeof(*tmpl) > sizeof(tmpls_buf)) {
 239                                 fprintf(stderr, "Too many tmpls: buffer overflow\n");
 240                                 exit(1);
 241                         }
 242                         tmpl = (struct xfrm_user_tmpl *)((char *)tmpls_buf + tmpls_len);
 243
 244                         tmpl->family = preferred_family;
 245                         tmpl->aalgos = (~(__u32)0);
 246                         tmpl->ealgos = (~(__u32)0);
 247                         tmpl->calgos = (~(__u32)0);
 248
 249                         NEXT_ARG();
 250                         xfrm_tmpl_parse(tmpl, &argc, &argv);
 251
 252                         tmpls_len += sizeof(*tmpl);
 253                 } else
 254                         invarg("unknown", *argv);
 255
 256                 argc--; argv++;
 257         }
 258
 259         if (!dirp) {
 260                 fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
 261                 exit(1);
 262         }
 263
 264         if (tmpls_len > 0) {
 265                 addattr_l(&req.n, sizeof(req), XFRMA_TMPL,
 266                           (void *)tmpls_buf, tmpls_len);
 267         }
 268
 269         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 270                 exit(1);
 271
 272         if (req.xpinfo.sel.family == AF_UNSPEC)
 273                 req.xpinfo.sel.family = AF_INET;
 274
 275         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 276                 exit(2);
 277
 278         rtnl_close(&rth);
 279
 280         return 0;
 281 }
 282
 283 static int xfrm_policy_filter_match(struct xfrm_userpolicy_info *xpinfo)
 284 {
 285         if (!filter.use)
 286                 return 1;
 287
 288         if ((xpinfo->dir^filter.xpinfo.dir)&filter.dir_mask)
 289                 return 0;
 290
 291         if (filter.sel_src_mask) {
 292                 if (memcmp(&xpinfo->sel.saddr, &filter.xpinfo.sel.saddr,
 293                            filter.sel_src_mask) != 0)
 294                         return 0;
 295                 if (xpinfo->sel.prefixlen_s != filter.xpinfo.sel.prefixlen_s)
 296                         return 0;
 297         }
 298
 299         if (filter.sel_dst_mask) {
 300                 if (memcmp(&xpinfo->sel.daddr, &filter.xpinfo.sel.daddr,
 301                            filter.sel_dst_mask) != 0)
 302                         return 0;
 303                 if (xpinfo->sel.prefixlen_d != filter.xpinfo.sel.prefixlen_d)
 304                         return 0;
 305         }
 306
 307         if ((xpinfo->sel.ifindex^filter.xpinfo.sel.ifindex)&filter.sel_dev_mask)
 308                 return 0;
 309
 310         if ((xpinfo->sel.proto^filter.xpinfo.sel.proto)&filter.upspec_proto_mask)
 311                 return 0;
 312
 313         if (filter.upspec_sport_mask) {
 314                 if ((xpinfo->sel.sport^filter.xpinfo.sel.sport)&filter.upspec_sport_mask)
 315                         return 0;
 316         }
 317
 318         if (filter.upspec_dport_mask) {
 319                 if ((xpinfo->sel.dport^filter.xpinfo.sel.dport)&filter.upspec_dport_mask)
 320                         return 0;
 321         }
 322
 323         if ((xpinfo->index^filter.xpinfo.index)&filter.index_mask)
 324                 return 0;
 325
 326         if ((xpinfo->action^filter.xpinfo.action)&filter.action_mask)
 327                 return 0;
 328
 329         if ((xpinfo->priority^filter.xpinfo.priority)&filter.priority_mask)
 330                 return 0;
 331
 332         return 1;
 333 }
 334
 335 int xfrm_policy_print(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 336 {
 337         FILE *fp = (FILE*)arg;
 338         struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(n);
 339         int len = n->nlmsg_len;
 340         struct rtattr * tb[XFRM_MAX_DEPTH];
 341         int ntb;
 342
 343         if (n->nlmsg_type != XFRM_MSG_NEWPOLICY &&
 344             n->nlmsg_type != XFRM_MSG_DELPOLICY) {
 345                 fprintf(stderr, "Not a policy: %08x %08x %08x\n",
 346                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 347                 return 0;
 348         }
 349
 350         len -= NLMSG_LENGTH(sizeof(*xpinfo));
 351         if (len < 0) {
 352                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 353                 return -1;
 354         }
 355
 356         if (!xfrm_policy_filter_match(xpinfo))
 357                 return 0;
 358
 359         memset(tb, 0, sizeof(tb));
 360         ntb = parse_rtattr_byindex(tb, XFRM_MAX_DEPTH, XFRMP_RTA(xpinfo), len);
 361
 362         if (n->nlmsg_type == XFRM_MSG_DELPOLICY)
 363                 fprintf(fp, "Deleted ");
 364
 365         fprintf(fp, "sel ");
 366         xfrm_selector_print(&xpinfo->sel, preferred_family, fp, NULL);
 367
 368         fprintf(fp, "\t");
 369         fprintf(fp, "dir ");
 370         switch (xpinfo->dir) {
 371         case XFRM_POLICY_IN:
 372                 fprintf(fp, "in");
 373                 break;
 374         case XFRM_POLICY_OUT:
 375                 fprintf(fp, "out");
 376                 break;
 377         case XFRM_POLICY_FWD:
 378                 fprintf(fp, "fwd");
 379                 break;
 380         default:
 381                 fprintf(fp, "%d", xpinfo->dir);
 382                 break;
 383         }
 384         fprintf(fp, " ");
 385
 386         fprintf(fp, "action ");
 387         switch (xpinfo->action) {
 388         case XFRM_POLICY_ALLOW:
 389                 fprintf(fp, "allow");
 390                 break;
 391         case XFRM_POLICY_BLOCK:
 392                 fprintf(fp, "block");
 393                 break;
 394         default:
 395                 fprintf(fp, "%d", xpinfo->action);
 396                 break;
 397         }
 398         fprintf(fp, " ");
 399
 400         fprintf(fp, "index %u ", xpinfo->index);
 401         fprintf(fp, "priority %u ", xpinfo->priority);
 402         if (show_stats > 0) {
 403                 fprintf(fp, "share %s ", strxf_share(xpinfo->share));
 404                 fprintf(fp, "flags 0x%s", strxf_flags(xpinfo->flags));
 405         }
 406         fprintf(fp, "\n");
 407
 408         if (show_stats > 0)
 409                 xfrm_lifetime_print(&xpinfo->lft, &xpinfo->curlft, fp, "\t");
 410
 411         xfrm_xfrma_print(tb, ntb, xpinfo->sel.family, fp, "\t");
 412
 413         return 0;
 414 }
 415
 416 static int xfrm_policy_get_or_delete(int argc, char **argv, int delete,
 417                                      void *res_nlbuf)
 418 {
 419         struct rtnl_handle rth;
 420         struct {
 421                 struct nlmsghdr                 n;
 422                 struct xfrm_userpolicy_id       xpid;
 423         } req;
 424         char *dirp = NULL;
 425         char *selp = NULL;
 426         char *indexp = NULL;
 427
 428         memset(&req, 0, sizeof(req));
 429
 430         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpid));
 431         req.n.nlmsg_flags = NLM_F_REQUEST;
 432         req.n.nlmsg_type = delete ? XFRM_MSG_DELPOLICY : XFRM_MSG_GETPOLICY;
 433
 434         while (argc > 0) {
 435                 if (strcmp(*argv, "dir") == 0) {
 436                         if (dirp)
 437                                 duparg("dir", *argv);
 438                         dirp = *argv;
 439
 440                         NEXT_ARG();
 441                         xfrm_policy_dir_parse(&req.xpid.dir, &argc, &argv);
 442
 443                 } else if (strcmp(*argv, "sel") == 0) {
 444                         if (selp)
 445                                 duparg("sel", *argv);
 446                         selp = *argv;
 447
 448                         NEXT_ARG();
 449                         xfrm_selector_parse(&req.xpid.sel, &argc, &argv);
 450                         if (preferred_family == AF_UNSPEC)
 451                                 preferred_family = req.xpid.sel.family;
 452
 453                 } else if (strcmp(*argv, "index") == 0) {
 454                         if (indexp)
 455                                 duparg("index", *argv);
 456                         indexp = *argv;
 457
 458                         NEXT_ARG();
 459                         if (get_u32(&req.xpid.index, *argv, 0))
 460                                 invarg("\"INDEX\" is invalid", *argv);
 461
 462                 } else
 463                         invarg("unknown", *argv);
 464
 465                 argc--; argv++;
 466         }
 467
 468         if (!dirp) {
 469                 fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
 470                 exit(1);
 471         }
 472         if (!selp && !indexp) {
 473                 fprintf(stderr, "Not enough information: either \"SELECTOR\" or \"INDEX\" is required.\n");
 474                 exit(1);
 475         }
 476         if (selp && indexp)
 477                 duparg2("SELECTOR", "INDEX");
 478
 479         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 480                 exit(1);
 481
 482         if (req.xpid.sel.family == AF_UNSPEC)
 483                 req.xpid.sel.family = AF_INET;
 484
 485         if (rtnl_talk(&rth, &req.n, 0, 0, res_nlbuf, NULL, NULL) < 0)
 486                 exit(2);
 487
 488         rtnl_close(&rth);
 489
 490         return 0;
 491 }
 492
 493 static int xfrm_policy_delete(int argc, char **argv)
 494 {
 495         return xfrm_policy_get_or_delete(argc, argv, 1, NULL);
 496 }
 497
 498 static int xfrm_policy_get(int argc, char **argv)
 499 {
 500         char buf[NLMSG_BUF_SIZE];
 501         struct nlmsghdr *n = (struct nlmsghdr *)buf;
 502
 503         memset(buf, 0, sizeof(buf));
 504
 505         xfrm_policy_get_or_delete(argc, argv, 0, n);
 506
 507         if (xfrm_policy_print(NULL, n, (void*)stdout) < 0) {
 508                 fprintf(stderr, "An error :-)\n");
 509                 exit(1);
 510         }
 511
 512         return 0;
 513 }
 514
 515 /*
 516  * With an existing policy of nlmsg, make new nlmsg for deleting the policy
 517  * and store it to buffer.
 518  */
 519 int xfrm_policy_keep(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 520 {
 521         struct xfrm_buffer *xb = (struct xfrm_buffer *)arg;
 522         struct rtnl_handle *rth = xb->rth;
 523         struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(n);
 524         int len = n->nlmsg_len;
 525         struct nlmsghdr *new_n;
 526         struct xfrm_userpolicy_id *xpid;
 527
 528         if (n->nlmsg_type != XFRM_MSG_NEWPOLICY) {
 529                 fprintf(stderr, "Not a policy: %08x %08x %08x\n",
 530                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 531                 return 0;
 532         }
 533
 534         len -= NLMSG_LENGTH(sizeof(*xpinfo));
 535         if (len < 0) {
 536                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 537                 return -1;
 538         }
 539
 540         if (!xfrm_policy_filter_match(xpinfo))
 541                 return 0;
 542
 543         if (xb->offset > xb->size) {
 544                 fprintf(stderr, "Flush buffer overflow\n");
 545                 return -1;
 546         }
 547
 548         new_n = (struct nlmsghdr *)(xb->buf + xb->offset);
 549         new_n->nlmsg_len = NLMSG_LENGTH(sizeof(*xpid));
 550         new_n->nlmsg_flags = NLM_F_REQUEST;
 551         new_n->nlmsg_type = XFRM_MSG_DELPOLICY;
 552         new_n->nlmsg_seq = ++rth->seq;
 553
 554         xpid = NLMSG_DATA(new_n);
 555         memcpy(&xpid->sel, &xpinfo->sel, sizeof(xpid->sel));
 556         xpid->dir = xpinfo->dir;
 557         xpid->index = xpinfo->index;
 558
 559         xb->offset += new_n->nlmsg_len;
 560         xb->nlmsg_count ++;
 561
 562         return 0;
 563 }
 564
 565 static int xfrm_policy_list_or_flush(int argc, char **argv, int flush)
 566 {
 567         struct rtnl_handle rth;
 568
 569         if (argc > 0)
 570                 filter.use = 1;
 571         filter.xpinfo.sel.family = preferred_family;
 572
 573         while (argc > 0) {
 574                 if (strcmp(*argv, "dir") == 0) {
 575                         NEXT_ARG();
 576                         xfrm_policy_dir_parse(&filter.xpinfo.dir, &argc, &argv);
 577
 578                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 579
 580                 } else if (strcmp(*argv, "sel") == 0) {
 581                         NEXT_ARG();
 582                         xfrm_selector_parse(&filter.xpinfo.sel, &argc, &argv);
 583                         if (preferred_family == AF_UNSPEC)
 584                                 preferred_family = filter.xpinfo.sel.family;
 585
 586                 } else if (strcmp(*argv, "index") == 0) {
 587                         NEXT_ARG();
 588                         if (get_u32(&filter.xpinfo.index, *argv, 0))
 589                                 invarg("\"INDEX\" is invalid", *argv);
 590
 591                         filter.index_mask = XFRM_FILTER_MASK_FULL;
 592
 593                 } else if (strcmp(*argv, "action") == 0) {
 594                         NEXT_ARG();
 595                         if (strcmp(*argv, "allow") == 0)
 596                                 filter.xpinfo.action = XFRM_POLICY_ALLOW;
 597                         else if (strcmp(*argv, "block") == 0)
 598                                 filter.xpinfo.action = XFRM_POLICY_BLOCK;
 599                         else
 600                                 invarg("\"action\" value is invalid\n", *argv);
 601
 602                         filter.action_mask = XFRM_FILTER_MASK_FULL;
 603
 604                 } else if (strcmp(*argv, "priority") == 0) {
 605                         NEXT_ARG();
 606                         if (get_u32(&filter.xpinfo.priority, *argv, 0))
 607                                 invarg("\"PRIORITY\" is invalid", *argv);
 608
 609                         filter.priority_mask = XFRM_FILTER_MASK_FULL;
 610
 611                 } else
 612                         invarg("unknown", *argv);
 613
 614                 argc--; argv++;
 615         }
 616
 617         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 618                 exit(1);
 619
 620         if (flush) {
 621                 struct xfrm_buffer xb;
 622                 char buf[NLMSG_FLUSH_BUF_SIZE];
 623                 int i;
 624
 625                 xb.buf = buf;
 626                 xb.size = sizeof(buf);
 627                 xb.rth = &rth;
 628
 629                 for (i = 0; ; i++) {
 630                         xb.offset = 0;
 631                         xb.nlmsg_count = 0;
 632
 633                         if (show_stats > 1)
 634                                 fprintf(stderr, "Flush round = %d\n", i);
 635
 636                         if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
 637                                 perror("Cannot send dump request");
 638                                 exit(1);
 639                         }
 640
 641                         if (rtnl_dump_filter(&rth, xfrm_policy_keep, &xb, NULL, NULL) < 0) {
 642                                 fprintf(stderr, "Flush terminated\n");
 643                                 exit(1);
 644                         }
 645                         if (xb.nlmsg_count == 0) {
 646                                 if (show_stats > 1)
 647                                         fprintf(stderr, "Flush completed\n");
 648                                 break;
 649                         }
 650
 651                         if (rtnl_send(&rth, xb.buf, xb.offset) < 0) {
 652                                 perror("Failed to send flush request\n");
 653                                 exit(1);
 654                         }
 655                         if (show_stats > 1)
 656                                 fprintf(stderr, "Flushed nlmsg count = %d\n", xb.nlmsg_count);
 657
 658                         xb.offset = 0;
 659                         xb.nlmsg_count = 0;
 660                 }
 661         } else {
 662                 if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
 663                         perror("Cannot send dump request");
 664                         exit(1);
 665                 }
 666
 667                 if (rtnl_dump_filter(&rth, xfrm_policy_print, stdout, NULL, NULL) < 0) {
 668                         fprintf(stderr, "Dump terminated\n");
 669                         exit(1);
 670                 }
 671         }
 672
 673         rtnl_close(&rth);
 674
 675         exit(0);
 676 }
 677
 678 int do_xfrm_policy(int argc, char **argv)
 679 {
 680         if (argc < 1)
 681                 return xfrm_policy_list_or_flush(0, NULL, 0);
 682
 683         if (matches(*argv, "add") == 0)
 684                 return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, 0,
 685                                           argc-1, argv+1);
 686         if (matches(*argv, "update") == 0)
 687                 return xfrm_policy_modify(XFRM_MSG_UPDPOLICY, 0,
 688                                           argc-1, argv+1);
 689         if (matches(*argv, "delete") == 0 || matches(*argv, "del") == 0)
 690                 return xfrm_policy_delete(argc-1, argv+1);
 691         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 692             || matches(*argv, "lst") == 0)
 693                 return xfrm_policy_list_or_flush(argc-1, argv+1, 0);
 694         if (matches(*argv, "get") == 0)
 695                 return xfrm_policy_get(argc-1, argv+1);
 696         if (matches(*argv, "flush") == 0)
 697                 return xfrm_policy_list_or_flush(argc-1, argv+1, 1);
 698         if (matches(*argv, "help") == 0)
 699                 usage();
 700         fprintf(stderr, "Command \"%s\" is unknown, try \"ip xfrm policy help\".\n", *argv);
 701         exit(-1);
 702 }