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 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 [ SELECTOR | index INDEX ]\n");
  59         fprintf(stderr, "Usage: ip xfrm policy { flush | list } [ dir DIR ] [ 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 ] [ dev DEV ]\n");
  64
  65         fprintf(stderr, "UPSPEC := proto PROTO [ [ sport PORT ] [ dport PORT ] |\n");
  66         fprintf(stderr, "                        [ type NUMBER ] [ code NUMBER ] ]\n");
  67
  68         //fprintf(stderr, "DEV - device name(default=none)\n");
  69
  70         fprintf(stderr, "ACTION := [ allow | block ](default=allow)\n");
  71
  72         //fprintf(stderr, "PRIORITY - priority value(default=0)\n");
  73
  74         fprintf(stderr, "LIMIT-LIST := [ LIMIT-LIST ] | [ limit LIMIT ]\n");
  75         fprintf(stderr, "LIMIT := [ [time-soft|time-hard|time-use-soft|time-use-hard] SECONDS ] |\n");
  76         fprintf(stderr, "         [ [byte-soft|byte-hard] SIZE ] | [ [packet-soft|packet-hard] NUMBER ]\n");
  77
  78         fprintf(stderr, "TMPL-LIST := [ TMPL-LIST ] | [ tmpl TMPL ]\n");
  79         fprintf(stderr, "TMPL := ID [ mode MODE ] [ reqid REQID ] [ level LEVEL ]\n");
  80         fprintf(stderr, "ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM_PROTO ] [ spi SPI ]\n");
  81
  82         //fprintf(stderr, "XFRM_PROTO := [ esp | ah | comp ]\n");
  83         fprintf(stderr, "XFRM_PROTO := [ ");
  84         fprintf(stderr, "%s | ", strxf_xfrmproto(IPPROTO_ESP));
  85         fprintf(stderr, "%s | ", strxf_xfrmproto(IPPROTO_AH));
  86         fprintf(stderr, "%s", strxf_xfrmproto(IPPROTO_COMP));
  87         fprintf(stderr, " ]\n");
  88
  89         fprintf(stderr, "MODE := [ transport | tunnel ](default=transport)\n");
  90         //fprintf(stderr, "REQID - number(default=0)\n");
  91         fprintf(stderr, "LEVEL := [ required | use ](default=required)\n");
  92
  93         exit(-1);
  94 }
  95
  96 static int xfrm_policy_dir_parse(__u8 *dir, int *argcp, char ***argvp)
  97 {
  98         int argc = *argcp;
  99         char **argv = *argvp;
 100
 101         if (strcmp(*argv, "in") == 0)
 102                 *dir = XFRM_POLICY_IN;
 103         else if (strcmp(*argv, "out") == 0)
 104                 *dir = XFRM_POLICY_OUT;
 105         else if (strcmp(*argv, "fwd") == 0)
 106                 *dir = XFRM_POLICY_FWD;
 107         else
 108                 invarg("\"DIR\" is invalid", *argv);
 109
 110         *argcp = argc;
 111         *argvp = argv;
 112
 113         return 0;
 114 }
 115
 116 static int xfrm_tmpl_parse(struct xfrm_user_tmpl *tmpl,
 117                            int *argcp, char ***argvp)
 118 {
 119         int argc = *argcp;
 120         char **argv = *argvp;
 121         char *idp = NULL;
 122
 123         while (1) {
 124                 if (strcmp(*argv, "mode") == 0) {
 125                         NEXT_ARG();
 126                         xfrm_mode_parse(&tmpl->mode,  &argc, &argv);
 127                 } else if (strcmp(*argv, "reqid") == 0) {
 128                         NEXT_ARG();
 129                         xfrm_reqid_parse(&tmpl->reqid, &argc, &argv);
 130                 } else if (strcmp(*argv, "level") == 0) {
 131                         NEXT_ARG();
 132
 133                         if (strcmp(*argv, "required") == 0)
 134                                 tmpl->optional = 0;
 135                         else if (strcmp(*argv, "use") == 0)
 136                                 tmpl->optional = 1;
 137                         else
 138                                 invarg("\"LEVEL\" is invalid\n", *argv);
 139
 140                 } else {
 141                         if (idp) {
 142                                 PREV_ARG(); /* back track */
 143                                 break;
 144                         }
 145                         idp = *argv;
 146                         xfrm_id_parse(&tmpl->saddr, &tmpl->id, &tmpl->family,
 147                                       0, &argc, &argv);
 148                         if (preferred_family == AF_UNSPEC)
 149                                 preferred_family = tmpl->family;
 150                 }
 151
 152                 if (!NEXT_ARG_OK())
 153                         break;
 154
 155                 NEXT_ARG();
 156         }
 157         if (argc == *argcp)
 158                 missarg("TMPL");
 159
 160         *argcp = argc;
 161         *argvp = argv;
 162
 163         return 0;
 164 }
 165
 166 static int xfrm_policy_modify(int cmd, unsigned flags, int argc, char **argv)
 167 {
 168         struct rtnl_handle rth;
 169         struct {
 170                 struct nlmsghdr                 n;
 171                 struct xfrm_userpolicy_info     xpinfo;
 172                 char                            buf[RTA_BUF_SIZE];
 173         } req;
 174         char *dirp = NULL;
 175         char *selp = NULL;
 176         char tmpls_buf[XFRM_TMPLS_BUF_SIZE];
 177         int tmpls_len = 0;
 178
 179         memset(&req, 0, sizeof(req));
 180         memset(&tmpls_buf, 0, sizeof(tmpls_buf));
 181
 182         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpinfo));
 183         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 184         req.n.nlmsg_type = cmd;
 185         req.xpinfo.sel.family = preferred_family;
 186
 187         req.xpinfo.lft.soft_byte_limit = XFRM_INF;
 188         req.xpinfo.lft.hard_byte_limit = XFRM_INF;
 189         req.xpinfo.lft.soft_packet_limit = XFRM_INF;
 190         req.xpinfo.lft.hard_packet_limit = XFRM_INF;
 191
 192         while (argc > 0) {
 193                 if (strcmp(*argv, "dir") == 0) {
 194                         if (dirp)
 195                                 duparg("dir", *argv);
 196                         dirp = *argv;
 197
 198                         NEXT_ARG();
 199                         xfrm_policy_dir_parse(&req.xpinfo.dir, &argc, &argv);
 200
 201                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 202
 203                 } else if (strcmp(*argv, "index") == 0) {
 204                         NEXT_ARG();
 205                         if (get_u32(&req.xpinfo.index, *argv, 0))
 206                                 invarg("\"INDEX\" is invalid", *argv);
 207
 208                         filter.index_mask = XFRM_FILTER_MASK_FULL;
 209
 210                 } else if (strcmp(*argv, "action") == 0) {
 211                         NEXT_ARG();
 212                         if (strcmp(*argv, "allow") == 0)
 213                                 req.xpinfo.action = XFRM_POLICY_ALLOW;
 214                         else if (strcmp(*argv, "block") == 0)
 215                                 req.xpinfo.action = XFRM_POLICY_BLOCK;
 216                         else
 217                                 invarg("\"action\" value is invalid\n", *argv);
 218
 219                         filter.action_mask = XFRM_FILTER_MASK_FULL;
 220
 221                 } else if (strcmp(*argv, "priority") == 0) {
 222                         NEXT_ARG();
 223                         if (get_u32(&req.xpinfo.priority, *argv, 0))
 224                                 invarg("\"PRIORITY\" is invalid", *argv);
 225
 226                         filter.priority_mask = XFRM_FILTER_MASK_FULL;
 227
 228                 } else if (strcmp(*argv, "limit") == 0) {
 229                         NEXT_ARG();
 230                         xfrm_lifetime_cfg_parse(&req.xpinfo.lft, &argc, &argv);
 231                 } else if (strcmp(*argv, "tmpl") == 0) {
 232                         struct xfrm_user_tmpl *tmpl;
 233
 234                         if (tmpls_len + sizeof(*tmpl) > sizeof(tmpls_buf)) {
 235                                 fprintf(stderr, "Too many tmpls: buffer overflow\n");
 236                                 exit(1);
 237                         }
 238                         tmpl = (struct xfrm_user_tmpl *)((char *)tmpls_buf + tmpls_len);
 239
 240                         tmpl->family = preferred_family;
 241                         tmpl->aalgos = (~(__u32)0);
 242                         tmpl->ealgos = (~(__u32)0);
 243                         tmpl->calgos = (~(__u32)0);
 244
 245                         NEXT_ARG();
 246                         xfrm_tmpl_parse(tmpl, &argc, &argv);
 247
 248                         tmpls_len += sizeof(*tmpl);
 249                 } else {
 250                         if (selp)
 251                                 duparg("unknown", *argv);
 252                         selp = *argv;
 253
 254                         xfrm_selector_parse(&req.xpinfo.sel, &argc, &argv);
 255                         if (preferred_family == AF_UNSPEC)
 256                                 preferred_family = req.xpinfo.sel.family;
 257                 }
 258
 259                 argc--; argv++;
 260         }
 261
 262         if (!dirp) {
 263                 fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
 264                 exit(1);
 265         }
 266
 267         if (tmpls_len > 0) {
 268                 addattr_l(&req.n, sizeof(req), XFRMA_TMPL,
 269                           (void *)tmpls_buf, tmpls_len);
 270         }
 271
 272         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 273                 exit(1);
 274
 275         if (req.xpinfo.sel.family == AF_UNSPEC)
 276                 req.xpinfo.sel.family = AF_INET;
 277
 278         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 279                 exit(2);
 280
 281         rtnl_close(&rth);
 282
 283         return 0;
 284 }
 285
 286 static int xfrm_policy_filter_match(struct xfrm_userpolicy_info *xpinfo)
 287 {
 288         if (!filter.use)
 289                 return 1;
 290
 291         if ((xpinfo->dir^filter.xpinfo.dir)&filter.dir_mask)
 292                 return 0;
 293
 294         if (filter.sel_src_mask) {
 295                 if (xfrm_addr_match(&xpinfo->sel.saddr, &filter.xpinfo.sel.saddr,
 296                                     filter.sel_src_mask))
 297                         return 0;
 298         }
 299
 300         if (filter.sel_dst_mask) {
 301                 if (xfrm_addr_match(&xpinfo->sel.daddr, &filter.xpinfo.sel.daddr,
 302                                     filter.sel_dst_mask))
 303                         return 0;
 304         }
 305
 306         if ((xpinfo->sel.ifindex^filter.xpinfo.sel.ifindex)&filter.sel_dev_mask)
 307                 return 0;
 308
 309         if ((xpinfo->sel.proto^filter.xpinfo.sel.proto)&filter.upspec_proto_mask)
 310                 return 0;
 311
 312         if (filter.upspec_sport_mask) {
 313                 if ((xpinfo->sel.sport^filter.xpinfo.sel.sport)&filter.upspec_sport_mask)
 314                         return 0;
 315         }
 316
 317         if (filter.upspec_dport_mask) {
 318                 if ((xpinfo->sel.dport^filter.xpinfo.sel.dport)&filter.upspec_dport_mask)
 319                         return 0;
 320         }
 321
 322         if ((xpinfo->index^filter.xpinfo.index)&filter.index_mask)
 323                 return 0;
 324
 325         if ((xpinfo->action^filter.xpinfo.action)&filter.action_mask)
 326                 return 0;
 327
 328         if ((xpinfo->priority^filter.xpinfo.priority)&filter.priority_mask)
 329                 return 0;
 330
 331         return 1;
 332 }
 333
 334 static int xfrm_policy_print(const struct sockaddr_nl *who,
 335                              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         xfrm_selector_print(&xpinfo->sel, preferred_family, fp, NULL);
 366
 367         fprintf(fp, "\t");
 368         fprintf(fp, "dir ");
 369         switch (xpinfo->dir) {
 370         case XFRM_POLICY_IN:
 371                 fprintf(fp, "in");
 372                 break;
 373         case XFRM_POLICY_OUT:
 374                 fprintf(fp, "out");
 375                 break;
 376         case XFRM_POLICY_FWD:
 377                 fprintf(fp, "fwd");
 378                 break;
 379         default:
 380                 fprintf(fp, "%u", xpinfo->dir);
 381                 break;
 382         }
 383         fprintf(fp, " ");
 384
 385         switch (xpinfo->action) {
 386         case XFRM_POLICY_ALLOW:
 387                 if (show_stats > 0)
 388                         fprintf(fp, "action allow ");
 389                 break;
 390         case XFRM_POLICY_BLOCK:
 391                 fprintf(fp, "action block ");
 392                 break;
 393         default:
 394                 fprintf(fp, "action %u ", xpinfo->action);
 395                 break;
 396         }
 397
 398         if (show_stats)
 399                 fprintf(fp, "index %u ", xpinfo->index);
 400         fprintf(fp, "priority %u ", xpinfo->priority);
 401         if (show_stats > 0) {
 402                 fprintf(fp, "share %s ", strxf_share(xpinfo->share));
 403                 fprintf(fp, "flag 0x%s", strxf_mask8(xpinfo->flags));
 404         }
 405         fprintf(fp, "%s", _SL_);
 406
 407         if (show_stats > 0)
 408                 xfrm_lifetime_print(&xpinfo->lft, &xpinfo->curlft, fp, "\t");
 409
 410         xfrm_xfrma_print(tb, ntb, xpinfo->sel.family, fp, "\t");
 411
 412         if (oneline)
 413                 fprintf(fp, "\n");
 414
 415         return 0;
 416 }
 417
 418 static int xfrm_policy_get_or_delete(int argc, char **argv, int delete,
 419                                      void *res_nlbuf)
 420 {
 421         struct rtnl_handle rth;
 422         struct {
 423                 struct nlmsghdr                 n;
 424                 struct xfrm_userpolicy_id       xpid;
 425         } req;
 426         char *dirp = NULL;
 427         char *selp = NULL;
 428         char *indexp = NULL;
 429
 430         memset(&req, 0, sizeof(req));
 431
 432         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpid));
 433         req.n.nlmsg_flags = NLM_F_REQUEST;
 434         req.n.nlmsg_type = delete ? XFRM_MSG_DELPOLICY : XFRM_MSG_GETPOLICY;
 435
 436         while (argc > 0) {
 437                 if (strcmp(*argv, "dir") == 0) {
 438                         if (dirp)
 439                                 duparg("dir", *argv);
 440                         dirp = *argv;
 441
 442                         NEXT_ARG();
 443                         xfrm_policy_dir_parse(&req.xpid.dir, &argc, &argv);
 444
 445                 } else if (strcmp(*argv, "index") == 0) {
 446                         if (indexp)
 447                                 duparg("index", *argv);
 448                         indexp = *argv;
 449
 450                         NEXT_ARG();
 451                         if (get_u32(&req.xpid.index, *argv, 0))
 452                                 invarg("\"INDEX\" is invalid", *argv);
 453
 454                 } else {
 455                         if (selp)
 456                                 invarg("unknown", *argv);
 457                         selp = *argv;
 458
 459                         xfrm_selector_parse(&req.xpid.sel, &argc, &argv);
 460                         if (preferred_family == AF_UNSPEC)
 461                                 preferred_family = req.xpid.sel.family;
 462
 463                 }
 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 static int xfrm_policy_keep(const struct sockaddr_nl *who,
 520                             struct nlmsghdr *n,
 521                             void *arg)
 522 {
 523         struct xfrm_buffer *xb = (struct xfrm_buffer *)arg;
 524         struct rtnl_handle *rth = xb->rth;
 525         struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(n);
 526         int len = n->nlmsg_len;
 527         struct nlmsghdr *new_n;
 528         struct xfrm_userpolicy_id *xpid;
 529
 530         if (n->nlmsg_type != XFRM_MSG_NEWPOLICY) {
 531                 fprintf(stderr, "Not a policy: %08x %08x %08x\n",
 532                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 533                 return 0;
 534         }
 535
 536         len -= NLMSG_LENGTH(sizeof(*xpinfo));
 537         if (len < 0) {
 538                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 539                 return -1;
 540         }
 541
 542         if (!xfrm_policy_filter_match(xpinfo))
 543                 return 0;
 544
 545         if (xb->offset > xb->size) {
 546                 fprintf(stderr, "Flush buffer overflow\n");
 547                 return -1;
 548         }
 549
 550         new_n = (struct nlmsghdr *)(xb->buf + xb->offset);
 551         new_n->nlmsg_len = NLMSG_LENGTH(sizeof(*xpid));
 552         new_n->nlmsg_flags = NLM_F_REQUEST;
 553         new_n->nlmsg_type = XFRM_MSG_DELPOLICY;
 554         new_n->nlmsg_seq = ++rth->seq;
 555
 556         xpid = NLMSG_DATA(new_n);
 557         memcpy(&xpid->sel, &xpinfo->sel, sizeof(xpid->sel));
 558         xpid->dir = xpinfo->dir;
 559         xpid->index = xpinfo->index;
 560
 561         xb->offset += new_n->nlmsg_len;
 562         xb->nlmsg_count ++;
 563
 564         return 0;
 565 }
 566
 567 static int xfrm_policy_list_or_flush(int argc, char **argv, int flush)
 568 {
 569         char *selp = NULL;
 570         struct rtnl_handle rth;
 571
 572         if (argc > 0)
 573                 filter.use = 1;
 574         filter.xpinfo.sel.family = preferred_family;
 575
 576         while (argc > 0) {
 577                 if (strcmp(*argv, "dir") == 0) {
 578                         NEXT_ARG();
 579                         xfrm_policy_dir_parse(&filter.xpinfo.dir, &argc, &argv);
 580
 581                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 582
 583                 } else if (strcmp(*argv, "index") == 0) {
 584                         NEXT_ARG();
 585                         if (get_u32(&filter.xpinfo.index, *argv, 0))
 586                                 invarg("\"INDEX\" is invalid", *argv);
 587
 588                         filter.index_mask = XFRM_FILTER_MASK_FULL;
 589
 590                 } else if (strcmp(*argv, "action") == 0) {
 591                         NEXT_ARG();
 592                         if (strcmp(*argv, "allow") == 0)
 593                                 filter.xpinfo.action = XFRM_POLICY_ALLOW;
 594                         else if (strcmp(*argv, "block") == 0)
 595                                 filter.xpinfo.action = XFRM_POLICY_BLOCK;
 596                         else
 597                                 invarg("\"ACTION\" is invalid\n", *argv);
 598
 599                         filter.action_mask = XFRM_FILTER_MASK_FULL;
 600
 601                 } else if (strcmp(*argv, "priority") == 0) {
 602                         NEXT_ARG();
 603                         if (get_u32(&filter.xpinfo.priority, *argv, 0))
 604                                 invarg("\"PRIORITY\" is invalid", *argv);
 605
 606                         filter.priority_mask = XFRM_FILTER_MASK_FULL;
 607
 608                 } else {
 609                         if (selp)
 610                                 invarg("unknown", *argv);
 611                         selp = *argv;
 612
 613                         xfrm_selector_parse(&filter.xpinfo.sel, &argc, &argv);
 614                         if (preferred_family == AF_UNSPEC)
 615                                 preferred_family = filter.xpinfo.sel.family;
 616
 617                 }
 618
 619                 argc--; argv++;
 620         }
 621
 622         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 623                 exit(1);
 624
 625         if (flush) {
 626                 struct xfrm_buffer xb;
 627                 char buf[NLMSG_FLUSH_BUF_SIZE];
 628                 int i;
 629
 630                 xb.buf = buf;
 631                 xb.size = sizeof(buf);
 632                 xb.rth = &rth;
 633
 634                 for (i = 0; ; i++) {
 635                         xb.offset = 0;
 636                         xb.nlmsg_count = 0;
 637
 638                         if (show_stats > 1)
 639                                 fprintf(stderr, "Flush round = %d\n", i);
 640
 641                         if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
 642                                 perror("Cannot send dump request");
 643                                 exit(1);
 644                         }
 645
 646                         if (rtnl_dump_filter(&rth, xfrm_policy_keep, &xb, NULL, NULL) < 0) {
 647                                 fprintf(stderr, "Flush terminated\n");
 648                                 exit(1);
 649                         }
 650                         if (xb.nlmsg_count == 0) {
 651                                 if (show_stats > 1)
 652                                         fprintf(stderr, "Flush completed\n");
 653                                 break;
 654                         }
 655
 656                         if (rtnl_send(&rth, xb.buf, xb.offset) < 0) {
 657                                 perror("Failed to send flush request\n");
 658                                 exit(1);
 659                         }
 660                         if (show_stats > 1)
 661                                 fprintf(stderr, "Flushed nlmsg count = %d\n", xb.nlmsg_count);
 662
 663                         xb.offset = 0;
 664                         xb.nlmsg_count = 0;
 665                 }
 666         } else {
 667                 if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
 668                         perror("Cannot send dump request");
 669                         exit(1);
 670                 }
 671
 672                 if (rtnl_dump_filter(&rth, xfrm_policy_print, stdout, NULL, NULL) < 0) {
 673                         fprintf(stderr, "Dump terminated\n");
 674                         exit(1);
 675                 }
 676         }
 677
 678         rtnl_close(&rth);
 679
 680         exit(0);
 681 }
 682
 683 static int xfrm_policy_flush_all(void)
 684 {
 685         struct rtnl_handle rth;
 686         struct {
 687                 struct nlmsghdr n;
 688         } req;
 689
 690         memset(&req, 0, sizeof(req));
 691
 692         req.n.nlmsg_len = NLMSG_LENGTH(0); /* nlmsg data is nothing */
 693         req.n.nlmsg_flags = NLM_F_REQUEST;
 694         req.n.nlmsg_type = XFRM_MSG_FLUSHPOLICY;
 695
 696         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 697                 exit(1);
 698
 699         if (show_stats > 1)
 700                 fprintf(stderr, "Flush all\n");
 701
 702         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 703                 exit(2);
 704
 705         rtnl_close(&rth);
 706
 707         return 0;
 708 }
 709
 710 int do_xfrm_policy(int argc, char **argv)
 711 {
 712         if (argc < 1)
 713                 return xfrm_policy_list_or_flush(0, NULL, 0);
 714
 715         if (matches(*argv, "add") == 0)
 716                 return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, 0,
 717                                           argc-1, argv+1);
 718         if (matches(*argv, "update") == 0)
 719                 return xfrm_policy_modify(XFRM_MSG_UPDPOLICY, 0,
 720                                           argc-1, argv+1);
 721         if (matches(*argv, "delete") == 0 || matches(*argv, "del") == 0)
 722                 return xfrm_policy_delete(argc-1, argv+1);
 723         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 724             || matches(*argv, "lst") == 0)
 725                 return xfrm_policy_list_or_flush(argc-1, argv+1, 0);
 726         if (matches(*argv, "get") == 0)
 727                 return xfrm_policy_get(argc-1, argv+1);
 728         if (matches(*argv, "flush") == 0) {
 729                 if (argc-1 < 1)
 730                         return xfrm_policy_flush_all();
 731                 else
 732                         return xfrm_policy_list_or_flush(argc-1, argv+1, 1);
 733         }
 734         if (matches(*argv, "help") == 0)
 735                 usage();
 736         fprintf(stderr, "Command \"%s\" is unknown, try \"ip xfrm policy help\".\n", *argv);
 737         exit(-1);
 738 }