ubus.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jo@mein.io>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "ubus.h"
  20
  21 static struct blob_attr *interfaces = NULL;
  22 static struct blob_attr *procd_data;
  23
  24
  25 static void dump_cb(struct ubus_request *req, int type, struct blob_attr *msg)
  26 {
  27         static const struct blobmsg_policy policy = { "interface", BLOBMSG_TYPE_ARRAY };
  28         struct blob_attr *cur;
  29
  30         blobmsg_parse(&policy, 1, &cur, blob_data(msg), blob_len(msg));
  31         if (cur)
  32                 interfaces = blob_memdup(cur);
  33 }
  34
  35 static void procd_data_cb(struct ubus_request *req, int type, struct blob_attr *msg)
  36 {
  37         procd_data = blob_memdup(msg);
  38 }
  39
  40 bool
  41 fw3_ubus_connect(void)
  42 {
  43         bool status = false;
  44         uint32_t id;
  45         struct ubus_context *ctx = ubus_connect(NULL);
  46         struct blob_buf b = { };
  47
  48         blob_buf_init(&b, 0);
  49
  50         if (!ctx)
  51                 goto out;
  52
  53         if (ubus_lookup_id(ctx, "network.interface", &id))
  54                 goto out;
  55
  56         if (ubus_invoke(ctx, id, "dump", b.head, dump_cb, NULL, 2000))
  57                 goto out;
  58
  59         status = true;
  60
  61         if (ubus_lookup_id(ctx, "service", &id))
  62                 goto out;
  63
  64         blobmsg_add_string(&b, "type", "firewall");
  65         ubus_invoke(ctx, id, "get_data", b.head, procd_data_cb, NULL, 2000);
  66
  67 out:
  68         blob_buf_free(&b);
  69
  70         if (ctx)
  71                 ubus_free(ctx);
  72
  73         return status;
  74 }
  75
  76 void
  77 fw3_ubus_disconnect(void)
  78 {
  79         free(interfaces);
  80         interfaces = NULL;
  81 }
  82
  83 static struct fw3_address *
  84 parse_subnet(enum fw3_family family, struct blob_attr *dict, int rem)
  85 {
  86         struct blob_attr *cur;
  87         struct fw3_address *addr;
  88
  89         addr = calloc(1, sizeof(*addr));
  90         if (!addr)
  91                 return NULL;
  92
  93         addr->set = true;
  94         addr->family = family;
  95
  96         __blob_for_each_attr(cur, dict, rem)
  97         {
  98                 if (!strcmp(blobmsg_name(cur), "address"))
  99                         inet_pton(family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 100                                   blobmsg_get_string(cur), &addr->address.v6);
 101
 102                 else if (!strcmp(blobmsg_name(cur), "mask"))
 103                         fw3_bitlen2netmask(family, blobmsg_get_u32(cur), &addr->mask.v6);
 104         }
 105
 106         return addr;
 107 }
 108
 109 static int
 110 parse_subnets(struct list_head *head, enum fw3_family family,
 111               struct blob_attr *list)
 112 {
 113         struct blob_attr *cur;
 114         struct fw3_address *addr;
 115         int rem, n = 0;
 116
 117         if (!list)
 118                 return 0;
 119
 120         rem = blobmsg_data_len(list);
 121
 122         __blob_for_each_attr(cur, blobmsg_data(list), rem)
 123         {
 124                 addr = parse_subnet(family, blobmsg_data(cur), blobmsg_data_len(cur));
 125
 126                 if (addr)
 127                 {
 128                         list_add_tail(&addr->list, head);
 129                         n++;
 130                 }
 131         }
 132
 133         return n;
 134 }
 135
 136 struct fw3_device *
 137 fw3_ubus_device(const char *net)
 138 {
 139         enum {
 140                 DEV_INTERFACE,
 141                 DEV_DEVICE,
 142                 DEV_L3_DEVICE,
 143                 __DEV_MAX
 144         };
 145         static const struct blobmsg_policy policy[__DEV_MAX] = {
 146                 [DEV_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 147                 [DEV_DEVICE] = { "device", BLOBMSG_TYPE_STRING },
 148                 [DEV_L3_DEVICE] = { "l3_device", BLOBMSG_TYPE_STRING },
 149         };
 150         struct fw3_device *dev = NULL;
 151         struct blob_attr *tb[__DEV_MAX];
 152         struct blob_attr *cur;
 153         char *name = NULL;
 154         int rem;
 155
 156         if (!net || !interfaces)
 157                 return NULL;
 158
 159         blobmsg_for_each_attr(cur, interfaces, rem) {
 160                 blobmsg_parse(policy, __DEV_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 161                 if (!tb[DEV_INTERFACE] ||
 162                     strcmp(blobmsg_data(tb[DEV_INTERFACE]), net) != 0)
 163                         continue;
 164
 165                 if (tb[DEV_L3_DEVICE])
 166                         name = blobmsg_data(tb[DEV_L3_DEVICE]);
 167                 else if (tb[DEV_DEVICE])
 168                         name = blobmsg_data(tb[DEV_DEVICE]);
 169                 else
 170                         continue;
 171
 172                 break;
 173         }
 174
 175         if (!name)
 176                 return NULL;
 177
 178         dev = calloc(1, sizeof(*dev));
 179
 180         if (!dev)
 181                 return NULL;
 182
 183         snprintf(dev->name, sizeof(dev->name), "%s", name);
 184         dev->set = true;
 185
 186         return dev;
 187 }
 188
 189 int
 190 fw3_ubus_address(struct list_head *list, const char *net)
 191 {
 192         enum {
 193                 ADDR_INTERFACE,
 194                 ADDR_IPV4,
 195                 ADDR_IPV6,
 196                 ADDR_IPV6_PREFIX,
 197                 __ADDR_MAX
 198         };
 199         static const struct blobmsg_policy policy[__ADDR_MAX] = {
 200                 [ADDR_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 201                 [ADDR_IPV4] = { "ipv4-address", BLOBMSG_TYPE_ARRAY },
 202                 [ADDR_IPV6] = { "ipv6-address", BLOBMSG_TYPE_ARRAY },
 203                 [ADDR_IPV6_PREFIX] = { "ipv6-prefix-assignment", BLOBMSG_TYPE_ARRAY },
 204         };
 205         struct blob_attr *tb[__ADDR_MAX];
 206         struct blob_attr *cur;
 207         int rem, n = 0;
 208
 209         if (!net || !interfaces)
 210                 return 0;
 211
 212         blobmsg_for_each_attr(cur, interfaces, rem) {
 213                 blobmsg_parse(policy, __ADDR_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 214
 215                 if (!tb[ADDR_INTERFACE] ||
 216                     strcmp(blobmsg_data(tb[ADDR_INTERFACE]), net) != 0)
 217                         continue;
 218
 219                 n += parse_subnets(list, FW3_FAMILY_V4, tb[ADDR_IPV4]);
 220                 n += parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6]);
 221                 n += parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6_PREFIX]);
 222         }
 223
 224         return n;
 225 }
 226
 227 void
 228 fw3_ubus_zone_devices(struct fw3_zone *zone)
 229 {
 230         struct blob_attr *c, *cur, *dcur;
 231         unsigned r, rem, drem;
 232         const char *name;
 233         bool matches;
 234
 235         blobmsg_for_each_attr(c, interfaces, r) {
 236                 name = NULL;
 237                 matches = false;
 238
 239                 blobmsg_for_each_attr(cur, c, rem) {
 240                         if (!strcmp(blobmsg_name(cur), "interface"))
 241                                 name = blobmsg_get_string(cur);
 242                         else if (!strcmp(blobmsg_name(cur), "data"))
 243                                 blobmsg_for_each_attr(dcur, cur, drem)
 244                                         if (!strcmp(blobmsg_name(dcur), "zone"))
 245                                                 matches = !strcmp(blobmsg_get_string(dcur), zone->name);
 246                 }
 247
 248                 if (name && matches)
 249                         fw3_parse_device(&zone->networks, name, true);
 250         }
 251 }
 252
 253 static void fw3_ubus_rules_add(struct blob_buf *b, const char *service,
 254                 const char *instance, const char *device,
 255                 const struct blob_attr *rule, unsigned n)
 256 {
 257         void *k = blobmsg_open_table(b, "");
 258         struct blob_attr *ropt;
 259         unsigned orem;
 260         char *type = NULL, *name = NULL;
 261         char comment[256];
 262
 263         blobmsg_for_each_attr(ropt, rule, orem) {
 264                 if (!strcmp(blobmsg_name(ropt), "type"))
 265                         type = blobmsg_data(ropt);
 266                 else if (!strcmp(blobmsg_name(ropt), "name"))
 267                         name = blobmsg_data(ropt);
 268
 269                 if (device && !strcmp(blobmsg_name(ropt), "device"))
 270                         device = blobmsg_get_string(ropt);
 271                 else if (strcmp(blobmsg_name(ropt), "name"))
 272                         blobmsg_add_blob(b, ropt);
 273         }
 274
 275         if (!type || strcmp(type, "ipset")) {
 276                 if (instance)
 277                         snprintf(comment, sizeof(comment), "ubus:%s[%s] %s %d",
 278                                         service, instance, type ? type : "rule", n);
 279                 else
 280                         snprintf(comment, sizeof(comment), "ubus:%s %s %d",
 281                                         service, type ? type : "rule", n);
 282
 283                 blobmsg_add_string(b, "name", comment);
 284         }
 285         else if (name) {
 286                 blobmsg_add_string(b, "name", name);
 287         }
 288
 289         if (device)
 290                 blobmsg_add_string(b, "device", device);
 291
 292         blobmsg_close_table(b, k);
 293 }
 294
 295 void
 296 fw3_ubus_rules(struct blob_buf *b)
 297 {
 298         blob_buf_init(b, 0);
 299
 300         struct blob_attr *c, *cur, *dcur, *rule;
 301         unsigned n, r, rem, drem, rrem;
 302
 303         blobmsg_for_each_attr(c, interfaces, r) {
 304                 const char *l3_device = NULL;
 305                 const char *iface_proto = "unknown";
 306                 const char *iface_name = "unknown";
 307                 struct blob_attr *data = NULL;
 308
 309                 blobmsg_for_each_attr(cur, c, rem) {
 310                         if (!strcmp(blobmsg_name(cur), "l3_device"))
 311                                 l3_device = blobmsg_get_string(cur);
 312                         else if (!strcmp(blobmsg_name(cur), "interface"))
 313                                 iface_name = blobmsg_get_string(cur);
 314                         else if (!strcmp(blobmsg_name(cur), "proto"))
 315                                 iface_proto = blobmsg_get_string(cur);
 316                         else if (!strcmp(blobmsg_name(cur), "data"))
 317                                 data = cur;
 318                 }
 319
 320                 if (!data || !l3_device)
 321                         continue;
 322
 323                 blobmsg_for_each_attr(dcur, data, drem) {
 324                         if (strcmp(blobmsg_name(dcur), "firewall"))
 325                                 continue;
 326
 327                         n = 0;
 328
 329                         blobmsg_for_each_attr(rule, dcur, rrem)
 330                                 fw3_ubus_rules_add(b, iface_name, iface_proto,
 331                                         l3_device, rule, n++);
 332                 }
 333         }
 334
 335         if (!procd_data)
 336                 return;
 337
 338         /* service */
 339         blobmsg_for_each_attr(c, procd_data, r) {
 340                 if (!blobmsg_check_attr(c, true))
 341                         continue;
 342
 343                 /* instance */
 344                 blobmsg_for_each_attr(cur, c, rem) {
 345                         if (!blobmsg_check_attr(cur, true))
 346                                 continue;
 347
 348                         /* fw rules within the service itself */
 349                         if (!strcmp(blobmsg_name(cur), "firewall")) {
 350                                 n = 0;
 351
 352                                 blobmsg_for_each_attr(rule, cur, rrem)
 353                                         fw3_ubus_rules_add(b, blobmsg_name(c),
 354                                                 NULL, NULL, rule, n++);
 355
 356                                 continue;
 357                         }
 358
 359                         /* type */
 360                         blobmsg_for_each_attr(dcur, cur, drem) {
 361                                 if (!blobmsg_check_attr(dcur, true))
 362                                         continue;
 363
 364                                 if (strcmp(blobmsg_name(dcur), "firewall"))
 365                                         continue;
 366
 367                                 n = 0;
 368
 369                                 blobmsg_for_each_attr(rule, dcur, rrem)
 370                                         fw3_ubus_rules_add(b, blobmsg_name(c),
 371                                                 blobmsg_name(cur), NULL, rule, n++);
 372                         }
 373                 }
 374         }
 375 }