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_DELETEALL_BUF_SIZE (4096-512)
  39 #define NLMSG_DELETEALL_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 ] [ ptype PTYPE ]\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 ] [ ptype PTYPE ]\n");
  59         fprintf(stderr, "Usage: ip xfrm policy { deleteall | list } [ dir DIR ] [ SELECTOR ]\n");
  60         fprintf(stderr, "        [ index INDEX ] [ action ACTION ] [ priority PRIORITY ]\n");
  61         fprintf(stderr, "Usage: ip xfrm policy flush [ ptype PTYPE ]\n");
  62
  63         fprintf(stderr, "PTYPE := [ main | sub ](default=main)\n");
  64         fprintf(stderr, "DIR := [ in | out | fwd ]\n");
  65
  66         fprintf(stderr, "SELECTOR := src ADDR[/PLEN] dst ADDR[/PLEN] [ UPSPEC ] [ dev DEV ]\n");
  67
  68         fprintf(stderr, "UPSPEC := proto PROTO [ [ sport PORT ] [ dport PORT ] |\n");
  69         fprintf(stderr, "                        [ type NUMBER ] [ code NUMBER ] ]\n");
  70
  71         //fprintf(stderr, "DEV - device name(default=none)\n");
  72
  73         fprintf(stderr, "ACTION := [ allow | block ](default=allow)\n");
  74
  75         //fprintf(stderr, "PRIORITY - priority value(default=0)\n");
  76
  77         fprintf(stderr, "LIMIT-LIST := [ LIMIT-LIST ] | [ limit LIMIT ]\n");
  78         fprintf(stderr, "LIMIT := [ [time-soft|time-hard|time-use-soft|time-use-hard] SECONDS ] |\n");
  79         fprintf(stderr, "         [ [byte-soft|byte-hard] SIZE ] | [ [packet-soft|packet-hard] NUMBER ]\n");
  80
  81         fprintf(stderr, "TMPL-LIST := [ TMPL-LIST ] | [ tmpl TMPL ]\n");
  82         fprintf(stderr, "TMPL := ID [ mode MODE ] [ reqid REQID ] [ level LEVEL ]\n");
  83         fprintf(stderr, "ID := [ src ADDR ] [ dst ADDR ] [ proto XFRM_PROTO ] [ spi SPI ]\n");
  84
  85         fprintf(stderr, "XFRM_PROTO := [ ");
  86         fprintf(stderr, "%s | ", strxf_xfrmproto(IPPROTO_ESP));
  87         fprintf(stderr, "%s | ", strxf_xfrmproto(IPPROTO_AH));
  88         fprintf(stderr, "%s | ", strxf_xfrmproto(IPPROTO_COMP));
  89         fprintf(stderr, "%s | ", strxf_xfrmproto(IPPROTO_ROUTING));
  90         fprintf(stderr, "%s ", strxf_xfrmproto(IPPROTO_DSTOPTS));
  91         fprintf(stderr, "]\n");
  92
  93         fprintf(stderr, "MODE := [ transport | tunnel | beet ](default=transport)\n");
  94         //fprintf(stderr, "REQID - number(default=0)\n");
  95         fprintf(stderr, "LEVEL := [ required | use ](default=required)\n");
  96
  97         exit(-1);
  98 }
  99
 100 static int xfrm_policy_dir_parse(__u8 *dir, int *argcp, char ***argvp)
 101 {
 102         int argc = *argcp;
 103         char **argv = *argvp;
 104
 105         if (strcmp(*argv, "in") == 0)
 106                 *dir = XFRM_POLICY_IN;
 107         else if (strcmp(*argv, "out") == 0)
 108                 *dir = XFRM_POLICY_OUT;
 109         else if (strcmp(*argv, "fwd") == 0)
 110                 *dir = XFRM_POLICY_FWD;
 111         else
 112                 invarg("\"DIR\" is invalid", *argv);
 113
 114         *argcp = argc;
 115         *argvp = argv;
 116
 117         return 0;
 118 }
 119
 120 static int xfrm_policy_ptype_parse(__u8 *ptype, int *argcp, char ***argvp)
 121 {
 122         int argc = *argcp;
 123         char **argv = *argvp;
 124
 125         if (strcmp(*argv, "main") == 0)
 126                 *ptype = XFRM_POLICY_TYPE_MAIN;
 127         else if (strcmp(*argv, "sub") == 0)
 128                 *ptype = XFRM_POLICY_TYPE_SUB;
 129         else
 130                 invarg("\"PTYPE\" is invalid", *argv);
 131
 132         *argcp = argc;
 133         *argvp = argv;
 134
 135         return 0;
 136 }
 137
 138 static int xfrm_tmpl_parse(struct xfrm_user_tmpl *tmpl,
 139                            int *argcp, char ***argvp)
 140 {
 141         int argc = *argcp;
 142         char **argv = *argvp;
 143         char *idp = NULL;
 144
 145         while (1) {
 146                 if (strcmp(*argv, "mode") == 0) {
 147                         NEXT_ARG();
 148                         xfrm_mode_parse(&tmpl->mode,  &argc, &argv);
 149                 } else if (strcmp(*argv, "reqid") == 0) {
 150                         NEXT_ARG();
 151                         xfrm_reqid_parse(&tmpl->reqid, &argc, &argv);
 152                 } else if (strcmp(*argv, "level") == 0) {
 153                         NEXT_ARG();
 154
 155                         if (strcmp(*argv, "required") == 0)
 156                                 tmpl->optional = 0;
 157                         else if (strcmp(*argv, "use") == 0)
 158                                 tmpl->optional = 1;
 159                         else
 160                                 invarg("\"LEVEL\" is invalid\n", *argv);
 161
 162                 } else {
 163                         if (idp) {
 164                                 PREV_ARG(); /* back track */
 165                                 break;
 166                         }
 167                         idp = *argv;
 168                         xfrm_id_parse(&tmpl->saddr, &tmpl->id, &tmpl->family,
 169                                       0, &argc, &argv);
 170                         if (preferred_family == AF_UNSPEC)
 171                                 preferred_family = tmpl->family;
 172                 }
 173
 174                 if (!NEXT_ARG_OK())
 175                         break;
 176
 177                 NEXT_ARG();
 178         }
 179         if (argc == *argcp)
 180                 missarg("TMPL");
 181
 182         *argcp = argc;
 183         *argvp = argv;
 184
 185         return 0;
 186 }
 187
 188 static int xfrm_policy_modify(int cmd, unsigned flags, int argc, char **argv)
 189 {
 190         struct rtnl_handle rth;
 191         struct {
 192                 struct nlmsghdr                 n;
 193                 struct xfrm_userpolicy_info     xpinfo;
 194                 char                            buf[RTA_BUF_SIZE];
 195         } req;
 196         char *dirp = NULL;
 197         char *selp = NULL;
 198         char *ptypep = NULL;
 199         struct xfrm_userpolicy_type upt;
 200         char tmpls_buf[XFRM_TMPLS_BUF_SIZE];
 201         int tmpls_len = 0;
 202
 203         memset(&req, 0, sizeof(req));
 204         memset(&upt, 0, sizeof(upt));
 205         memset(&tmpls_buf, 0, sizeof(tmpls_buf));
 206
 207         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpinfo));
 208         req.n.nlmsg_flags = NLM_F_REQUEST|flags;
 209         req.n.nlmsg_type = cmd;
 210         req.xpinfo.sel.family = preferred_family;
 211
 212         req.xpinfo.lft.soft_byte_limit = XFRM_INF;
 213         req.xpinfo.lft.hard_byte_limit = XFRM_INF;
 214         req.xpinfo.lft.soft_packet_limit = XFRM_INF;
 215         req.xpinfo.lft.hard_packet_limit = XFRM_INF;
 216
 217         while (argc > 0) {
 218                 if (strcmp(*argv, "dir") == 0) {
 219                         if (dirp)
 220                                 duparg("dir", *argv);
 221                         dirp = *argv;
 222
 223                         NEXT_ARG();
 224                         xfrm_policy_dir_parse(&req.xpinfo.dir, &argc, &argv);
 225
 226                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 227
 228                 } else if (strcmp(*argv, "index") == 0) {
 229                         NEXT_ARG();
 230                         if (get_u32(&req.xpinfo.index, *argv, 0))
 231                                 invarg("\"INDEX\" is invalid", *argv);
 232
 233                         filter.index_mask = XFRM_FILTER_MASK_FULL;
 234
 235                 } else if (strcmp(*argv, "ptype") == 0) {
 236                         if (ptypep)
 237                                 duparg("ptype", *argv);
 238                         ptypep = *argv;
 239
 240                         NEXT_ARG();
 241                         xfrm_policy_ptype_parse(&upt.type, &argc, &argv);
 242
 243                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 244
 245                 } else if (strcmp(*argv, "action") == 0) {
 246                         NEXT_ARG();
 247                         if (strcmp(*argv, "allow") == 0)
 248                                 req.xpinfo.action = XFRM_POLICY_ALLOW;
 249                         else if (strcmp(*argv, "block") == 0)
 250                                 req.xpinfo.action = XFRM_POLICY_BLOCK;
 251                         else
 252                                 invarg("\"action\" value is invalid\n", *argv);
 253
 254                         filter.action_mask = XFRM_FILTER_MASK_FULL;
 255
 256                 } else if (strcmp(*argv, "priority") == 0) {
 257                         NEXT_ARG();
 258                         if (get_u32(&req.xpinfo.priority, *argv, 0))
 259                                 invarg("\"PRIORITY\" is invalid", *argv);
 260
 261                         filter.priority_mask = XFRM_FILTER_MASK_FULL;
 262
 263                 } else if (strcmp(*argv, "limit") == 0) {
 264                         NEXT_ARG();
 265                         xfrm_lifetime_cfg_parse(&req.xpinfo.lft, &argc, &argv);
 266                 } else if (strcmp(*argv, "tmpl") == 0) {
 267                         struct xfrm_user_tmpl *tmpl;
 268
 269                         if (tmpls_len + sizeof(*tmpl) > sizeof(tmpls_buf)) {
 270                                 fprintf(stderr, "Too many tmpls: buffer overflow\n");
 271                                 exit(1);
 272                         }
 273                         tmpl = (struct xfrm_user_tmpl *)((char *)tmpls_buf + tmpls_len);
 274
 275                         tmpl->family = preferred_family;
 276                         tmpl->aalgos = (~(__u32)0);
 277                         tmpl->ealgos = (~(__u32)0);
 278                         tmpl->calgos = (~(__u32)0);
 279
 280                         NEXT_ARG();
 281                         xfrm_tmpl_parse(tmpl, &argc, &argv);
 282
 283                         tmpls_len += sizeof(*tmpl);
 284                 } else {
 285                         if (selp)
 286                                 duparg("unknown", *argv);
 287                         selp = *argv;
 288
 289                         xfrm_selector_parse(&req.xpinfo.sel, &argc, &argv);
 290                         if (preferred_family == AF_UNSPEC)
 291                                 preferred_family = req.xpinfo.sel.family;
 292                 }
 293
 294                 argc--; argv++;
 295         }
 296
 297         if (!dirp) {
 298                 fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
 299                 exit(1);
 300         }
 301
 302         if (ptypep) {
 303                 addattr_l(&req.n, sizeof(req), XFRMA_POLICY_TYPE,
 304                           (void *)&upt, sizeof(upt));
 305         }
 306
 307         if (tmpls_len > 0) {
 308                 addattr_l(&req.n, sizeof(req), XFRMA_TMPL,
 309                           (void *)tmpls_buf, tmpls_len);
 310         }
 311
 312         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 313                 exit(1);
 314
 315         if (req.xpinfo.sel.family == AF_UNSPEC)
 316                 req.xpinfo.sel.family = AF_INET;
 317
 318         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 319                 exit(2);
 320
 321         rtnl_close(&rth);
 322
 323         return 0;
 324 }
 325
 326 static int xfrm_policy_filter_match(struct xfrm_userpolicy_info *xpinfo,
 327                                     __u8 ptype)
 328 {
 329         if (!filter.use)
 330                 return 1;
 331
 332         if ((xpinfo->dir^filter.xpinfo.dir)&filter.dir_mask)
 333                 return 0;
 334
 335         if ((ptype^filter.ptype)&filter.ptype_mask)
 336                 return 0;
 337
 338         if (filter.sel_src_mask) {
 339                 if (xfrm_addr_match(&xpinfo->sel.saddr, &filter.xpinfo.sel.saddr,
 340                                     filter.sel_src_mask))
 341                         return 0;
 342         }
 343
 344         if (filter.sel_dst_mask) {
 345                 if (xfrm_addr_match(&xpinfo->sel.daddr, &filter.xpinfo.sel.daddr,
 346                                     filter.sel_dst_mask))
 347                         return 0;
 348         }
 349
 350         if ((xpinfo->sel.ifindex^filter.xpinfo.sel.ifindex)&filter.sel_dev_mask)
 351                 return 0;
 352
 353         if ((xpinfo->sel.proto^filter.xpinfo.sel.proto)&filter.upspec_proto_mask)
 354                 return 0;
 355
 356         if (filter.upspec_sport_mask) {
 357                 if ((xpinfo->sel.sport^filter.xpinfo.sel.sport)&filter.upspec_sport_mask)
 358                         return 0;
 359         }
 360
 361         if (filter.upspec_dport_mask) {
 362                 if ((xpinfo->sel.dport^filter.xpinfo.sel.dport)&filter.upspec_dport_mask)
 363                         return 0;
 364         }
 365
 366         if ((xpinfo->index^filter.xpinfo.index)&filter.index_mask)
 367                 return 0;
 368
 369         if ((xpinfo->action^filter.xpinfo.action)&filter.action_mask)
 370                 return 0;
 371
 372         if ((xpinfo->priority^filter.xpinfo.priority)&filter.priority_mask)
 373                 return 0;
 374
 375         return 1;
 376 }
 377
 378 int xfrm_policy_print(const struct sockaddr_nl *who, struct nlmsghdr *n,
 379                       void *arg)
 380 {
 381         struct rtattr * tb[XFRMA_MAX+1];
 382         struct rtattr * rta;
 383         struct xfrm_userpolicy_info *xpinfo = NULL;
 384         struct xfrm_user_polexpire *xpexp = NULL;
 385         struct xfrm_userpolicy_id *xpid = NULL;
 386         __u8 ptype = XFRM_POLICY_TYPE_MAIN;
 387         FILE *fp = (FILE*)arg;
 388         int len = n->nlmsg_len;
 389
 390         if (n->nlmsg_type != XFRM_MSG_NEWPOLICY &&
 391             n->nlmsg_type != XFRM_MSG_DELPOLICY &&
 392             n->nlmsg_type != XFRM_MSG_UPDPOLICY &&
 393             n->nlmsg_type != XFRM_MSG_POLEXPIRE) {
 394                 fprintf(stderr, "Not a policy: %08x %08x %08x\n",
 395                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 396                 return 0;
 397         }
 398
 399         if (n->nlmsg_type == XFRM_MSG_DELPOLICY)  {
 400                 xpid = NLMSG_DATA(n);
 401                 len -= NLMSG_SPACE(sizeof(*xpid));
 402         } else if (n->nlmsg_type == XFRM_MSG_POLEXPIRE) {
 403                 xpexp = NLMSG_DATA(n);
 404                 xpinfo = &xpexp->pol;
 405                 len -= NLMSG_SPACE(sizeof(*xpexp));
 406         } else {
 407                 xpexp = NULL;
 408                 xpinfo = NLMSG_DATA(n);
 409                 len -= NLMSG_SPACE(sizeof(*xpinfo));
 410         }
 411
 412         if (len < 0) {
 413                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 414                 return -1;
 415         }
 416
 417         if (n->nlmsg_type == XFRM_MSG_DELPOLICY)
 418                 rta = XFRMPID_RTA(xpid);
 419         else if (n->nlmsg_type == XFRM_MSG_POLEXPIRE)
 420                 rta = XFRMPEXP_RTA(xpexp);
 421         else
 422                 rta = XFRMP_RTA(xpinfo);
 423
 424         parse_rtattr(tb, XFRMA_MAX, rta, len);
 425
 426         if (tb[XFRMA_POLICY_TYPE]) {
 427                 struct xfrm_userpolicy_type *upt;
 428
 429                 if (RTA_PAYLOAD(tb[XFRMA_POLICY_TYPE]) < sizeof(*upt)) {
 430                         fprintf(stderr, "too short XFRMA_POLICY_TYPE len\n");
 431                         return -1;
 432                 }
 433                 upt = (struct xfrm_userpolicy_type *)RTA_DATA(tb[XFRMA_POLICY_TYPE]);
 434                 ptype = upt->type;
 435         }
 436
 437         if (xpinfo && !xfrm_policy_filter_match(xpinfo, ptype))
 438                 return 0;
 439
 440         if (n->nlmsg_type == XFRM_MSG_DELPOLICY)
 441                 fprintf(fp, "Deleted ");
 442         else if (n->nlmsg_type == XFRM_MSG_UPDPOLICY)
 443                 fprintf(fp, "Updated ");
 444         else if (n->nlmsg_type == XFRM_MSG_POLEXPIRE)
 445                 fprintf(fp, "Expired ");
 446
 447         if (n->nlmsg_type == XFRM_MSG_DELPOLICY) {
 448                 //xfrm_policy_id_print();
 449                 if (!tb[XFRMA_POLICY]) {
 450                         fprintf(stderr, "Buggy XFRM_MSG_DELPOLICY: no XFRMA_POLICY\n");
 451                         return -1;
 452                 }
 453                 if (RTA_PAYLOAD(tb[XFRMA_POLICY]) < sizeof(*xpinfo)) {
 454                         fprintf(stderr, "Buggy XFRM_MSG_DELPOLICY: too short XFRMA_POLICY len\n");
 455                         return -1;
 456                 }
 457                 xpinfo = (struct xfrm_userpolicy_info *)RTA_DATA(tb[XFRMA_POLICY]);
 458         }
 459
 460         xfrm_policy_info_print(xpinfo, tb, fp, NULL, NULL);
 461
 462         if (n->nlmsg_type == XFRM_MSG_POLEXPIRE) {
 463                 fprintf(fp, "\t");
 464                 fprintf(fp, "hard %u", xpexp->hard);
 465                 fprintf(fp, "%s", _SL_);
 466         }
 467
 468         if (oneline)
 469                 fprintf(fp, "\n");
 470         fflush(fp);
 471
 472         return 0;
 473 }
 474
 475 static int xfrm_policy_get_or_delete(int argc, char **argv, int delete,
 476                                      void *res_nlbuf)
 477 {
 478         struct rtnl_handle rth;
 479         struct {
 480                 struct nlmsghdr                 n;
 481                 struct xfrm_userpolicy_id       xpid;
 482                 char                            buf[RTA_BUF_SIZE];
 483         } req;
 484         char *dirp = NULL;
 485         char *selp = NULL;
 486         char *indexp = NULL;
 487         char *ptypep = NULL;
 488         struct xfrm_userpolicy_type upt;
 489
 490         memset(&req, 0, sizeof(req));
 491         memset(&upt, 0, sizeof(upt));
 492
 493         req.n.nlmsg_len = NLMSG_LENGTH(sizeof(req.xpid));
 494         req.n.nlmsg_flags = NLM_F_REQUEST;
 495         req.n.nlmsg_type = delete ? XFRM_MSG_DELPOLICY : XFRM_MSG_GETPOLICY;
 496
 497         while (argc > 0) {
 498                 if (strcmp(*argv, "dir") == 0) {
 499                         if (dirp)
 500                                 duparg("dir", *argv);
 501                         dirp = *argv;
 502
 503                         NEXT_ARG();
 504                         xfrm_policy_dir_parse(&req.xpid.dir, &argc, &argv);
 505
 506                 } else if (strcmp(*argv, "index") == 0) {
 507                         if (indexp)
 508                                 duparg("index", *argv);
 509                         indexp = *argv;
 510
 511                         NEXT_ARG();
 512                         if (get_u32(&req.xpid.index, *argv, 0))
 513                                 invarg("\"INDEX\" is invalid", *argv);
 514
 515                 } else if (strcmp(*argv, "ptype") == 0) {
 516                         if (ptypep)
 517                                 duparg("ptype", *argv);
 518                         ptypep = *argv;
 519
 520                         NEXT_ARG();
 521                         xfrm_policy_ptype_parse(&upt.type, &argc, &argv);
 522
 523                 } else {
 524                         if (selp)
 525                                 invarg("unknown", *argv);
 526                         selp = *argv;
 527
 528                         xfrm_selector_parse(&req.xpid.sel, &argc, &argv);
 529                         if (preferred_family == AF_UNSPEC)
 530                                 preferred_family = req.xpid.sel.family;
 531
 532                 }
 533
 534                 argc--; argv++;
 535         }
 536
 537         if (!dirp) {
 538                 fprintf(stderr, "Not enough information: \"DIR\" is required.\n");
 539                 exit(1);
 540         }
 541         if (ptypep) {
 542                 addattr_l(&req.n, sizeof(req), XFRMA_POLICY_TYPE,
 543                           (void *)&upt, sizeof(upt));
 544         }
 545         if (!selp && !indexp) {
 546                 fprintf(stderr, "Not enough information: either \"SELECTOR\" or \"INDEX\" is required.\n");
 547                 exit(1);
 548         }
 549         if (selp && indexp)
 550                 duparg2("SELECTOR", "INDEX");
 551
 552         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 553                 exit(1);
 554
 555         if (req.xpid.sel.family == AF_UNSPEC)
 556                 req.xpid.sel.family = AF_INET;
 557
 558         if (rtnl_talk(&rth, &req.n, 0, 0, res_nlbuf, NULL, NULL) < 0)
 559                 exit(2);
 560
 561         rtnl_close(&rth);
 562
 563         return 0;
 564 }
 565
 566 static int xfrm_policy_delete(int argc, char **argv)
 567 {
 568         return xfrm_policy_get_or_delete(argc, argv, 1, NULL);
 569 }
 570
 571 static int xfrm_policy_get(int argc, char **argv)
 572 {
 573         char buf[NLMSG_BUF_SIZE];
 574         struct nlmsghdr *n = (struct nlmsghdr *)buf;
 575
 576         memset(buf, 0, sizeof(buf));
 577
 578         xfrm_policy_get_or_delete(argc, argv, 0, n);
 579
 580         if (xfrm_policy_print(NULL, n, (void*)stdout) < 0) {
 581                 fprintf(stderr, "An error :-)\n");
 582                 exit(1);
 583         }
 584
 585         return 0;
 586 }
 587
 588 /*
 589  * With an existing policy of nlmsg, make new nlmsg for deleting the policy
 590  * and store it to buffer.
 591  */
 592 static int xfrm_policy_keep(const struct sockaddr_nl *who,
 593                             struct nlmsghdr *n,
 594                             void *arg)
 595 {
 596         struct xfrm_buffer *xb = (struct xfrm_buffer *)arg;
 597         struct rtnl_handle *rth = xb->rth;
 598         struct xfrm_userpolicy_info *xpinfo = NLMSG_DATA(n);
 599         int len = n->nlmsg_len;
 600         struct rtattr *tb[XFRMA_MAX+1];
 601         __u8 ptype = XFRM_POLICY_TYPE_MAIN;
 602         struct nlmsghdr *new_n;
 603         struct xfrm_userpolicy_id *xpid;
 604
 605         if (n->nlmsg_type != XFRM_MSG_NEWPOLICY) {
 606                 fprintf(stderr, "Not a policy: %08x %08x %08x\n",
 607                         n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
 608                 return 0;
 609         }
 610
 611         len -= NLMSG_LENGTH(sizeof(*xpinfo));
 612         if (len < 0) {
 613                 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
 614                 return -1;
 615         }
 616
 617         parse_rtattr(tb, XFRMA_MAX, XFRMP_RTA(xpinfo), len);
 618
 619         if (tb[XFRMA_POLICY_TYPE]) {
 620                 struct xfrm_userpolicy_type *upt;
 621
 622                 if (RTA_PAYLOAD(tb[XFRMA_POLICY_TYPE]) < sizeof(*upt)) {
 623                         fprintf(stderr, "too short XFRMA_POLICY_TYPE len\n");
 624                         return -1;
 625                 }
 626                 upt = (struct xfrm_userpolicy_type *)RTA_DATA(tb[XFRMA_POLICY_TYPE]);
 627                 ptype = upt->type;
 628         }
 629
 630         if (!xfrm_policy_filter_match(xpinfo, ptype))
 631                 return 0;
 632
 633         if (xb->offset > xb->size) {
 634                 fprintf(stderr, "Policy buffer overflow\n");
 635                 return -1;
 636         }
 637
 638         new_n = (struct nlmsghdr *)(xb->buf + xb->offset);
 639         new_n->nlmsg_len = NLMSG_LENGTH(sizeof(*xpid));
 640         new_n->nlmsg_flags = NLM_F_REQUEST;
 641         new_n->nlmsg_type = XFRM_MSG_DELPOLICY;
 642         new_n->nlmsg_seq = ++rth->seq;
 643
 644         xpid = NLMSG_DATA(new_n);
 645         memcpy(&xpid->sel, &xpinfo->sel, sizeof(xpid->sel));
 646         xpid->dir = xpinfo->dir;
 647         xpid->index = xpinfo->index;
 648
 649         xb->offset += new_n->nlmsg_len;
 650         xb->nlmsg_count ++;
 651
 652         return 0;
 653 }
 654
 655 static int xfrm_policy_list_or_deleteall(int argc, char **argv, int deleteall)
 656 {
 657         char *selp = NULL;
 658         struct rtnl_handle rth;
 659
 660         if (argc > 0)
 661                 filter.use = 1;
 662         filter.xpinfo.sel.family = preferred_family;
 663
 664         while (argc > 0) {
 665                 if (strcmp(*argv, "dir") == 0) {
 666                         NEXT_ARG();
 667                         xfrm_policy_dir_parse(&filter.xpinfo.dir, &argc, &argv);
 668
 669                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 670
 671                 } else if (strcmp(*argv, "index") == 0) {
 672                         NEXT_ARG();
 673                         if (get_u32(&filter.xpinfo.index, *argv, 0))
 674                                 invarg("\"INDEX\" is invalid", *argv);
 675
 676                         filter.index_mask = XFRM_FILTER_MASK_FULL;
 677
 678                 } else if (strcmp(*argv, "ptype") == 0) {
 679                         NEXT_ARG();
 680                         xfrm_policy_ptype_parse(&filter.ptype, &argc, &argv);
 681
 682                         filter.ptype_mask = XFRM_FILTER_MASK_FULL;
 683
 684                 } else if (strcmp(*argv, "action") == 0) {
 685                         NEXT_ARG();
 686                         if (strcmp(*argv, "allow") == 0)
 687                                 filter.xpinfo.action = XFRM_POLICY_ALLOW;
 688                         else if (strcmp(*argv, "block") == 0)
 689                                 filter.xpinfo.action = XFRM_POLICY_BLOCK;
 690                         else
 691                                 invarg("\"ACTION\" is invalid\n", *argv);
 692
 693                         filter.action_mask = XFRM_FILTER_MASK_FULL;
 694
 695                 } else if (strcmp(*argv, "priority") == 0) {
 696                         NEXT_ARG();
 697                         if (get_u32(&filter.xpinfo.priority, *argv, 0))
 698                                 invarg("\"PRIORITY\" is invalid", *argv);
 699
 700                         filter.priority_mask = XFRM_FILTER_MASK_FULL;
 701
 702                 } else {
 703                         if (selp)
 704                                 invarg("unknown", *argv);
 705                         selp = *argv;
 706
 707                         xfrm_selector_parse(&filter.xpinfo.sel, &argc, &argv);
 708                         if (preferred_family == AF_UNSPEC)
 709                                 preferred_family = filter.xpinfo.sel.family;
 710
 711                 }
 712
 713                 argc--; argv++;
 714         }
 715
 716         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 717                 exit(1);
 718
 719         if (deleteall) {
 720                 struct xfrm_buffer xb;
 721                 char buf[NLMSG_DELETEALL_BUF_SIZE];
 722                 int i;
 723
 724                 xb.buf = buf;
 725                 xb.size = sizeof(buf);
 726                 xb.rth = &rth;
 727
 728                 for (i = 0; ; i++) {
 729                         xb.offset = 0;
 730                         xb.nlmsg_count = 0;
 731
 732                         if (show_stats > 1)
 733                                 fprintf(stderr, "Delete-all round = %d\n", i);
 734
 735                         if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
 736                                 perror("Cannot send dump request");
 737                                 exit(1);
 738                         }
 739
 740                         if (rtnl_dump_filter(&rth, xfrm_policy_keep, &xb, NULL, NULL) < 0) {
 741                                 fprintf(stderr, "Delete-all terminated\n");
 742                                 exit(1);
 743                         }
 744                         if (xb.nlmsg_count == 0) {
 745                                 if (show_stats > 1)
 746                                         fprintf(stderr, "Delete-all completed\n");
 747                                 break;
 748                         }
 749
 750                         if (rtnl_send(&rth, xb.buf, xb.offset) < 0) {
 751                                 perror("Failed to send delete-all request\n");
 752                                 exit(1);
 753                         }
 754                         if (show_stats > 1)
 755                                 fprintf(stderr, "Delete-all nlmsg count = %d\n", xb.nlmsg_count);
 756
 757                         xb.offset = 0;
 758                         xb.nlmsg_count = 0;
 759                 }
 760         } else {
 761                 if (rtnl_wilddump_request(&rth, preferred_family, XFRM_MSG_GETPOLICY) < 0) {
 762                         perror("Cannot send dump request");
 763                         exit(1);
 764                 }
 765
 766                 if (rtnl_dump_filter(&rth, xfrm_policy_print, stdout, NULL, NULL) < 0) {
 767                         fprintf(stderr, "Dump terminated\n");
 768                         exit(1);
 769                 }
 770         }
 771
 772         rtnl_close(&rth);
 773
 774         exit(0);
 775 }
 776
 777 static int xfrm_policy_flush(int argc, char **argv)
 778 {
 779         struct rtnl_handle rth;
 780         struct {
 781                 struct nlmsghdr n;
 782                 char            buf[RTA_BUF_SIZE];
 783         } req;
 784         char *ptypep = NULL;
 785         struct xfrm_userpolicy_type upt;
 786
 787         memset(&req, 0, sizeof(req));
 788         memset(&upt, 0, sizeof(upt));
 789
 790         req.n.nlmsg_len = NLMSG_LENGTH(0); /* nlmsg data is nothing */
 791         req.n.nlmsg_flags = NLM_F_REQUEST;
 792         req.n.nlmsg_type = XFRM_MSG_FLUSHPOLICY;
 793
 794         while (argc > 0) {
 795                 if (strcmp(*argv, "ptype") == 0) {
 796                         if (ptypep)
 797                                 duparg("ptype", *argv);
 798                         ptypep = *argv;
 799
 800                         NEXT_ARG();
 801                         xfrm_policy_ptype_parse(&upt.type, &argc, &argv);
 802
 803                         filter.dir_mask = XFRM_FILTER_MASK_FULL;
 804                 } else
 805                         invarg("unknown", *argv);
 806
 807                 argc--; argv++;
 808         }
 809
 810         if (ptypep) {
 811                 addattr_l(&req.n, sizeof(req), XFRMA_POLICY_TYPE,
 812                           (void *)&upt, sizeof(upt));
 813         }
 814
 815         if (rtnl_open_byproto(&rth, 0, NETLINK_XFRM) < 0)
 816                 exit(1);
 817
 818         if (show_stats > 1)
 819                 fprintf(stderr, "Flush policy\n");
 820
 821         if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
 822                 exit(2);
 823
 824         rtnl_close(&rth);
 825
 826         return 0;
 827 }
 828
 829 int do_xfrm_policy(int argc, char **argv)
 830 {
 831         if (argc < 1)
 832                 return xfrm_policy_list_or_deleteall(0, NULL, 0);
 833
 834         if (matches(*argv, "add") == 0)
 835                 return xfrm_policy_modify(XFRM_MSG_NEWPOLICY, 0,
 836                                           argc-1, argv+1);
 837         if (matches(*argv, "update") == 0)
 838                 return xfrm_policy_modify(XFRM_MSG_UPDPOLICY, 0,
 839                                           argc-1, argv+1);
 840         if (matches(*argv, "delete") == 0)
 841                 return xfrm_policy_delete(argc-1, argv+1);
 842         if (matches(*argv, "deleteall") == 0 || matches(*argv, "delall") == 0)
 843                 return xfrm_policy_list_or_deleteall(argc-1, argv+1, 1);
 844         if (matches(*argv, "list") == 0 || matches(*argv, "show") == 0
 845             || matches(*argv, "lst") == 0)
 846                 return xfrm_policy_list_or_deleteall(argc-1, argv+1, 0);
 847         if (matches(*argv, "get") == 0)
 848                 return xfrm_policy_get(argc-1, argv+1);
 849         if (matches(*argv, "flush") == 0)
 850                 return xfrm_policy_flush(argc-1, argv+1);
 851         if (matches(*argv, "help") == 0)
 852                 usage();
 853         fprintf(stderr, "Command \"%s\" is unknown, try \"ip xfrm policy help\".\n", *argv);
 854         exit(-1);
 855 }