Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 1 | /* |
| 2 | * ctrl.c generic netlink controller |
| 3 | * |
| 4 | * This program is free software; you can distribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
| 7 | * 2 of the License, or (at your option) any later version. |
| 8 | * |
Johannes Berg | 80c05b0 | 2007-07-19 11:13:18 +0200 | [diff] [blame] | 9 | * Authors: J Hadi Salim (hadi@cyberus.ca) |
| 10 | * Johannes Berg (johannes@sipsolutions.net) |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
| 15 | #include <unistd.h> |
| 16 | #include <syslog.h> |
| 17 | #include <fcntl.h> |
| 18 | #include <sys/socket.h> |
| 19 | #include <netinet/in.h> |
| 20 | #include <arpa/inet.h> |
| 21 | #include <string.h> |
| 22 | |
| 23 | #include "utils.h" |
| 24 | #include "genl_utils.h" |
| 25 | |
jamal | 26328fc | 2006-12-06 12:35:52 -0500 | [diff] [blame] | 26 | #define GENL_MAX_FAM_OPS 256 |
Johannes Berg | 80c05b0 | 2007-07-19 11:13:18 +0200 | [diff] [blame] | 27 | #define GENL_MAX_FAM_GRPS 256 |
| 28 | |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 29 | static int usage(void) |
| 30 | { |
| 31 | fprintf(stderr,"Usage: ctrl <CMD>\n" \ |
| 32 | "CMD := get <PARMS> | list | monitor\n" \ |
| 33 | "PARMS := name <name> | id <id>\n" \ |
| 34 | "Examples:\n" \ |
| 35 | "\tctrl ls\n" \ |
| 36 | "\tctrl monitor\n" \ |
| 37 | "\tctrl get name foobar\n" \ |
| 38 | "\tctrl get id 0xF\n"); |
| 39 | return -1; |
| 40 | } |
| 41 | |
| 42 | int genl_ctrl_resolve_family(const char *family) |
| 43 | { |
| 44 | struct rtnl_handle rth; |
| 45 | struct nlmsghdr *nlh; |
| 46 | struct genlmsghdr *ghdr; |
| 47 | int ret = 0; |
| 48 | struct { |
| 49 | struct nlmsghdr n; |
| 50 | char buf[4096]; |
| 51 | } req; |
| 52 | |
| 53 | memset(&req, 0, sizeof(req)); |
| 54 | |
| 55 | nlh = &req.n; |
| 56 | nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN); |
| 57 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| 58 | nlh->nlmsg_type = GENL_ID_CTRL; |
| 59 | |
| 60 | ghdr = NLMSG_DATA(&req.n); |
| 61 | ghdr->cmd = CTRL_CMD_GETFAMILY; |
| 62 | |
| 63 | if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) { |
| 64 | fprintf(stderr, "Cannot open generic netlink socket\n"); |
| 65 | exit(1); |
| 66 | } |
| 67 | |
| 68 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, family, strlen(family) + 1); |
| 69 | |
| 70 | if (rtnl_talk(&rth, nlh, 0, 0, nlh, NULL, NULL) < 0) { |
| 71 | fprintf(stderr, "Error talking to the kernel\n"); |
| 72 | goto errout; |
| 73 | } |
| 74 | |
| 75 | { |
| 76 | struct rtattr *tb[CTRL_ATTR_MAX + 1]; |
| 77 | struct genlmsghdr *ghdr = NLMSG_DATA(nlh); |
| 78 | int len = nlh->nlmsg_len; |
| 79 | struct rtattr *attrs; |
| 80 | |
| 81 | if (nlh->nlmsg_type != GENL_ID_CTRL) { |
| 82 | fprintf(stderr, "Not a controller message, nlmsg_len=%d " |
| 83 | "nlmsg_type=0x%x\n", nlh->nlmsg_len, nlh->nlmsg_type); |
| 84 | goto errout; |
| 85 | } |
| 86 | |
| 87 | if (ghdr->cmd != CTRL_CMD_NEWFAMILY) { |
Johannes Berg | 80c05b0 | 2007-07-19 11:13:18 +0200 | [diff] [blame] | 88 | fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 89 | goto errout; |
| 90 | } |
| 91 | |
| 92 | len -= NLMSG_LENGTH(GENL_HDRLEN); |
| 93 | |
| 94 | if (len < 0) { |
| 95 | fprintf(stderr, "wrong controller message len %d\n", len); |
| 96 | return -1; |
| 97 | } |
| 98 | |
| 99 | attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); |
| 100 | parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); |
| 101 | |
| 102 | if (tb[CTRL_ATTR_FAMILY_ID] == NULL) { |
| 103 | fprintf(stderr, "Missing family id TLV\n"); |
| 104 | goto errout; |
| 105 | } |
| 106 | |
| 107 | ret = *(__u16 *) RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]); |
| 108 | } |
| 109 | |
| 110 | errout: |
| 111 | rtnl_close(&rth); |
| 112 | return ret; |
| 113 | } |
| 114 | |
jamal | 26328fc | 2006-12-06 12:35:52 -0500 | [diff] [blame] | 115 | void print_ctrl_cmd_flags(FILE *fp, __u32 fl) |
| 116 | { |
| 117 | fprintf(fp, "\n\t\tCapabilities (0x%x):\n ", fl); |
| 118 | if (!fl) { |
| 119 | fprintf(fp, "\n"); |
| 120 | return; |
| 121 | } |
| 122 | fprintf(fp, "\t\t "); |
| 123 | |
| 124 | if (fl & GENL_ADMIN_PERM) |
| 125 | fprintf(fp, " requires admin permission;"); |
| 126 | if (fl & GENL_CMD_CAP_DO) |
| 127 | fprintf(fp, " can doit;"); |
| 128 | if (fl & GENL_CMD_CAP_DUMP) |
| 129 | fprintf(fp, " can dumpit;"); |
| 130 | if (fl & GENL_CMD_CAP_HASPOL) |
| 131 | fprintf(fp, " has policy"); |
| 132 | |
| 133 | fprintf(fp, "\n"); |
| 134 | } |
| 135 | |
| 136 | static int print_ctrl_cmds(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) |
| 137 | { |
| 138 | struct rtattr *tb[CTRL_ATTR_OP_MAX + 1]; |
| 139 | |
| 140 | if (arg == NULL) |
| 141 | return -1; |
| 142 | |
| 143 | parse_rtattr_nested(tb, CTRL_ATTR_OP_MAX, arg); |
| 144 | if (tb[CTRL_ATTR_OP_ID]) { |
| 145 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_OP_ID]); |
| 146 | fprintf(fp, " ID-0x%x ",*id); |
| 147 | } |
| 148 | /* we are only gonna do this for newer version of the controller */ |
| 149 | if (tb[CTRL_ATTR_OP_FLAGS] && ctrl_ver >= 0x2) { |
| 150 | __u32 *fl = RTA_DATA(tb[CTRL_ATTR_OP_FLAGS]); |
| 151 | print_ctrl_cmd_flags(fp, *fl); |
| 152 | } |
| 153 | return 0; |
| 154 | |
| 155 | } |
| 156 | |
Johannes Berg | 80c05b0 | 2007-07-19 11:13:18 +0200 | [diff] [blame] | 157 | static int print_ctrl_grp(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) |
| 158 | { |
| 159 | struct rtattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1]; |
| 160 | |
| 161 | if (arg == NULL) |
| 162 | return -1; |
| 163 | |
| 164 | parse_rtattr_nested(tb, CTRL_ATTR_MCAST_GRP_MAX, arg); |
| 165 | if (tb[2]) { |
| 166 | __u32 *id = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_ID]); |
| 167 | fprintf(fp, " ID-0x%x ",*id); |
| 168 | } |
| 169 | if (tb[1]) { |
| 170 | char *name = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_NAME]); |
| 171 | fprintf(fp, " name: %s ", name); |
| 172 | } |
| 173 | return 0; |
| 174 | |
| 175 | } |
| 176 | |
jamal | 26328fc | 2006-12-06 12:35:52 -0500 | [diff] [blame] | 177 | /* |
| 178 | * The controller sends one nlmsg per family |
| 179 | */ |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 180 | static int print_ctrl(const struct sockaddr_nl *who, struct nlmsghdr *n, |
| 181 | void *arg) |
| 182 | { |
| 183 | struct rtattr *tb[CTRL_ATTR_MAX + 1]; |
| 184 | struct genlmsghdr *ghdr = NLMSG_DATA(n); |
| 185 | int len = n->nlmsg_len; |
| 186 | struct rtattr *attrs; |
| 187 | FILE *fp = (FILE *) arg; |
Stephen Hemminger | 81c6179 | 2006-12-13 17:05:50 -0800 | [diff] [blame] | 188 | __u32 ctrl_v = 0x1; |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 189 | |
| 190 | if (n->nlmsg_type != GENL_ID_CTRL) { |
| 191 | fprintf(stderr, "Not a controller message, nlmsg_len=%d " |
| 192 | "nlmsg_type=0x%x\n", n->nlmsg_len, n->nlmsg_type); |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | if (ghdr->cmd != CTRL_CMD_GETFAMILY && |
| 197 | ghdr->cmd != CTRL_CMD_DELFAMILY && |
Johannes Berg | 80c05b0 | 2007-07-19 11:13:18 +0200 | [diff] [blame] | 198 | ghdr->cmd != CTRL_CMD_NEWFAMILY && |
| 199 | ghdr->cmd != CTRL_CMD_NEWMCAST_GRP && |
| 200 | ghdr->cmd != CTRL_CMD_DELMCAST_GRP) { |
| 201 | fprintf(stderr, "Unknown controller command %d\n", ghdr->cmd); |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 202 | return 0; |
| 203 | } |
| 204 | |
| 205 | len -= NLMSG_LENGTH(GENL_HDRLEN); |
| 206 | |
| 207 | if (len < 0) { |
| 208 | fprintf(stderr, "wrong controller message len %d\n", len); |
| 209 | return -1; |
| 210 | } |
| 211 | |
| 212 | attrs = (struct rtattr *) ((char *) ghdr + GENL_HDRLEN); |
| 213 | parse_rtattr(tb, CTRL_ATTR_MAX, attrs, len); |
| 214 | |
| 215 | if (tb[CTRL_ATTR_FAMILY_NAME]) { |
| 216 | char *name = RTA_DATA(tb[CTRL_ATTR_FAMILY_NAME]); |
jamal | 26328fc | 2006-12-06 12:35:52 -0500 | [diff] [blame] | 217 | fprintf(fp, "\nName: %s\n",name); |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 218 | } |
| 219 | if (tb[CTRL_ATTR_FAMILY_ID]) { |
| 220 | __u16 *id = RTA_DATA(tb[CTRL_ATTR_FAMILY_ID]); |
jamal | 26328fc | 2006-12-06 12:35:52 -0500 | [diff] [blame] | 221 | fprintf(fp, "\tID: 0x%x ",*id); |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 222 | } |
jamal | 26328fc | 2006-12-06 12:35:52 -0500 | [diff] [blame] | 223 | if (tb[CTRL_ATTR_VERSION]) { |
| 224 | __u32 *v = RTA_DATA(tb[CTRL_ATTR_VERSION]); |
| 225 | fprintf(fp, " Version: 0x%x ",*v); |
| 226 | ctrl_v = *v; |
| 227 | } |
| 228 | if (tb[CTRL_ATTR_HDRSIZE]) { |
| 229 | __u32 *h = RTA_DATA(tb[CTRL_ATTR_HDRSIZE]); |
| 230 | fprintf(fp, " header size: %d ",*h); |
| 231 | } |
| 232 | if (tb[CTRL_ATTR_MAXATTR]) { |
| 233 | __u32 *ma = RTA_DATA(tb[CTRL_ATTR_MAXATTR]); |
| 234 | fprintf(fp, " max attribs: %d ",*ma); |
| 235 | } |
| 236 | /* end of family definitions .. */ |
| 237 | fprintf(fp,"\n"); |
| 238 | if (tb[CTRL_ATTR_OPS]) { |
| 239 | struct rtattr *tb2[GENL_MAX_FAM_OPS]; |
| 240 | int i=0; |
| 241 | parse_rtattr_nested(tb2, GENL_MAX_FAM_OPS, tb[CTRL_ATTR_OPS]); |
| 242 | fprintf(fp, "\tcommands supported: \n"); |
| 243 | for (i = 0; i < GENL_MAX_FAM_OPS; i++) { |
| 244 | if (tb2[i]) { |
| 245 | fprintf(fp, "\t\t#%d: ", i); |
| 246 | if (0 > print_ctrl_cmds(fp, tb2[i], ctrl_v)) { |
| 247 | fprintf(fp, "Error printing command\n"); |
| 248 | } |
| 249 | /* for next command */ |
| 250 | fprintf(fp,"\n"); |
| 251 | } |
| 252 | } |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 253 | |
jamal | 26328fc | 2006-12-06 12:35:52 -0500 | [diff] [blame] | 254 | /* end of family::cmds definitions .. */ |
| 255 | fprintf(fp,"\n"); |
| 256 | } |
Johannes Berg | 80c05b0 | 2007-07-19 11:13:18 +0200 | [diff] [blame] | 257 | |
| 258 | if (tb[CTRL_ATTR_MCAST_GROUPS]) { |
| 259 | struct rtattr *tb2[GENL_MAX_FAM_GRPS + 1]; |
| 260 | int i; |
| 261 | |
| 262 | parse_rtattr_nested(tb2, GENL_MAX_FAM_GRPS, |
| 263 | tb[CTRL_ATTR_MCAST_GROUPS]); |
| 264 | fprintf(fp, "\tmulticast groups:\n"); |
| 265 | |
| 266 | for (i = 0; i < GENL_MAX_FAM_GRPS; i++) { |
| 267 | if (tb2[i]) { |
| 268 | fprintf(fp, "\t\t#%d: ", i); |
| 269 | if (0 > print_ctrl_grp(fp, tb2[i], ctrl_v)) |
| 270 | fprintf(fp, "Error printing group\n"); |
| 271 | /* for next group */ |
| 272 | fprintf(fp,"\n"); |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | /* end of family::groups definitions .. */ |
| 277 | fprintf(fp,"\n"); |
| 278 | } |
| 279 | |
Jamal Hadi Salim | 65018ae | 2006-08-08 12:13:34 -0700 | [diff] [blame] | 280 | fflush(fp); |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static int ctrl_list(int cmd, int argc, char **argv) |
| 285 | { |
| 286 | struct rtnl_handle rth; |
| 287 | struct nlmsghdr *nlh; |
| 288 | struct genlmsghdr *ghdr; |
| 289 | int ret = -1; |
| 290 | char d[GENL_NAMSIZ]; |
| 291 | struct { |
| 292 | struct nlmsghdr n; |
| 293 | char buf[4096]; |
| 294 | } req; |
| 295 | |
| 296 | memset(&req, 0, sizeof(req)); |
| 297 | |
| 298 | nlh = &req.n; |
| 299 | nlh->nlmsg_len = NLMSG_LENGTH(GENL_HDRLEN); |
| 300 | nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| 301 | nlh->nlmsg_type = GENL_ID_CTRL; |
| 302 | |
| 303 | ghdr = NLMSG_DATA(&req.n); |
| 304 | ghdr->cmd = CTRL_CMD_GETFAMILY; |
| 305 | |
| 306 | if (rtnl_open_byproto(&rth, 0, NETLINK_GENERIC) < 0) { |
| 307 | fprintf(stderr, "Cannot open generic netlink socket\n"); |
| 308 | exit(1); |
| 309 | } |
| 310 | |
| 311 | if (cmd == CTRL_CMD_GETFAMILY) { |
| 312 | if (argc != 2) { |
| 313 | fprintf(stderr, "Wrong number of params\n"); |
| 314 | return -1; |
| 315 | } |
| 316 | |
| 317 | if (matches(*argv, "name") == 0) { |
| 318 | NEXT_ARG(); |
| 319 | strncpy(d, *argv, sizeof (d) - 1); |
| 320 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_NAME, |
| 321 | d, strlen(d) + 1); |
| 322 | } else if (matches(*argv, "id") == 0) { |
| 323 | __u16 id; |
| 324 | NEXT_ARG(); |
| 325 | if (get_u16(&id, *argv, 0)) { |
| 326 | fprintf(stderr, "Illegal \"id\"\n"); |
| 327 | goto ctrl_done; |
| 328 | } |
| 329 | |
| 330 | addattr_l(nlh, 128, CTRL_ATTR_FAMILY_ID, &id, 2); |
| 331 | |
| 332 | } else { |
| 333 | fprintf(stderr, "Wrong params\n"); |
| 334 | goto ctrl_done; |
| 335 | } |
| 336 | |
| 337 | if (rtnl_talk(&rth, nlh, 0, 0, nlh, NULL, NULL) < 0) { |
| 338 | fprintf(stderr, "Error talking to the kernel\n"); |
| 339 | goto ctrl_done; |
| 340 | } |
| 341 | |
| 342 | if (print_ctrl(NULL, nlh, (void *) stdout) < 0) { |
| 343 | fprintf(stderr, "Dump terminated\n"); |
| 344 | goto ctrl_done; |
| 345 | } |
| 346 | |
| 347 | } |
| 348 | |
| 349 | if (cmd == CTRL_CMD_UNSPEC) { |
| 350 | nlh->nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST; |
| 351 | nlh->nlmsg_seq = rth.dump = ++rth.seq; |
| 352 | |
| 353 | if (rtnl_send(&rth, (const char *) nlh, nlh->nlmsg_len) < 0) { |
| 354 | perror("Failed to send dump request\n"); |
| 355 | goto ctrl_done; |
| 356 | } |
| 357 | |
| 358 | rtnl_dump_filter(&rth, print_ctrl, stdout, NULL, NULL); |
| 359 | |
| 360 | } |
| 361 | |
| 362 | ret = 0; |
| 363 | ctrl_done: |
| 364 | rtnl_close(&rth); |
| 365 | return ret; |
| 366 | } |
| 367 | |
| 368 | static int ctrl_listen(int argc, char **argv) |
| 369 | { |
| 370 | struct rtnl_handle rth; |
| 371 | |
| 372 | if (rtnl_open_byproto(&rth, nl_mgrp(GENL_ID_CTRL), NETLINK_GENERIC) < 0) { |
| 373 | fprintf(stderr, "Canot open generic netlink socket\n"); |
| 374 | return -1; |
| 375 | } |
| 376 | |
| 377 | if (rtnl_listen(&rth, print_ctrl, (void *) stdout) < 0) |
| 378 | return -1; |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | static int parse_ctrl(struct genl_util *a, int argc, char **argv) |
| 384 | { |
| 385 | argv++; |
| 386 | if (--argc <= 0) { |
| 387 | fprintf(stderr, "wrong controller params\n"); |
| 388 | return -1; |
| 389 | } |
| 390 | |
| 391 | if (matches(*argv, "monitor") == 0) |
| 392 | return ctrl_listen(argc-1, argv+1); |
| 393 | if (matches(*argv, "get") == 0) |
| 394 | return ctrl_list(CTRL_CMD_GETFAMILY, argc-1, argv+1); |
| 395 | if (matches(*argv, "list") == 0 || |
| 396 | matches(*argv, "show") == 0 || |
| 397 | matches(*argv, "lst") == 0) |
| 398 | return ctrl_list(CTRL_CMD_UNSPEC, argc-1, argv+1); |
| 399 | if (matches(*argv, "help") == 0) |
| 400 | return usage(); |
| 401 | |
| 402 | fprintf(stderr, "ctrl command \"%s\" is unknown, try \"ctrl -help\".\n", |
| 403 | *argv); |
| 404 | |
| 405 | return -1; |
| 406 | } |
| 407 | |
| 408 | struct genl_util ctrl_genl_util = { |
| 409 | .name = "ctrl", |
| 410 | .parse_genlopt = parse_ctrl, |
| 411 | .print_genlopt = print_ctrl, |
| 412 | }; |