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         if (!ctx)
  49                 goto out;
  50
  51         if (ubus_lookup_id(ctx, "network.interface", &id))
  52                 goto out;
  53
  54         if (ubus_invoke(ctx, id, "dump", NULL, dump_cb, NULL, 2000))
  55                 goto out;
  56
  57         status = true;
  58
  59         if (ubus_lookup_id(ctx, "service", &id))
  60                 goto out;
  61
  62         blob_buf_init(&b, 0);
  63         blobmsg_add_string(&b, "type", "firewall");
  64         ubus_invoke(ctx, id, "get_data", b.head, procd_data_cb, NULL, 2000);
  65         blob_buf_free(&b);
  66
  67 out:
  68         if (ctx)
  69                 ubus_free(ctx);
  70         return status;
  71 }
  72
  73 void
  74 fw3_ubus_disconnect(void)
  75 {
  76         free(interfaces);
  77         interfaces = NULL;
  78 }
  79
  80 static struct fw3_address *
  81 parse_subnet(enum fw3_family family, struct blob_attr *dict, int rem)
  82 {
  83         struct blob_attr *cur;
  84         struct fw3_address *addr;
  85
  86         addr = calloc(1, sizeof(*addr));
  87         if (!addr)
  88                 return NULL;
  89
  90         addr->set = true;
  91         addr->family = family;
  92
  93         __blob_for_each_attr(cur, dict, rem)
  94         {
  95                 if (!strcmp(blobmsg_name(cur), "address"))
  96                         inet_pton(family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
  97                                   blobmsg_get_string(cur), &addr->address.v6);
  98
  99                 else if (!strcmp(blobmsg_name(cur), "mask"))
 100                         fw3_bitlen2netmask(family, blobmsg_get_u32(cur), &addr->mask.v6);
 101         }
 102
 103         return addr;
 104 }
 105
 106 static int
 107 parse_subnets(struct list_head *head, enum fw3_family family,
 108               struct blob_attr *list)
 109 {
 110         struct blob_attr *cur;
 111         struct fw3_address *addr;
 112         int rem, n = 0;
 113
 114         if (!list)
 115                 return 0;
 116
 117         rem = blobmsg_data_len(list);
 118
 119         __blob_for_each_attr(cur, blobmsg_data(list), rem)
 120         {
 121                 addr = parse_subnet(family, blobmsg_data(cur), blobmsg_data_len(cur));
 122
 123                 if (addr)
 124                 {
 125                         list_add_tail(&addr->list, head);
 126                         n++;
 127                 }
 128         }
 129
 130         return n;
 131 }
 132
 133 struct fw3_device *
 134 fw3_ubus_device(const char *net)
 135 {
 136         enum {
 137                 DEV_INTERFACE,
 138                 DEV_DEVICE,
 139                 DEV_L3_DEVICE,
 140                 __DEV_MAX
 141         };
 142         static const struct blobmsg_policy policy[__DEV_MAX] = {
 143                 [DEV_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 144                 [DEV_DEVICE] = { "device", BLOBMSG_TYPE_STRING },
 145                 [DEV_L3_DEVICE] = { "l3_device", BLOBMSG_TYPE_STRING },
 146         };
 147         struct fw3_device *dev = NULL;
 148         struct blob_attr *tb[__DEV_MAX];
 149         struct blob_attr *cur;
 150         char *name = NULL;
 151         int rem;
 152
 153         if (!net || !interfaces)
 154                 return NULL;
 155
 156         blobmsg_for_each_attr(cur, interfaces, rem) {
 157                 blobmsg_parse(policy, __DEV_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 158                 if (!tb[DEV_INTERFACE] ||
 159                     strcmp(blobmsg_data(tb[DEV_INTERFACE]), net) != 0)
 160                         continue;
 161
 162                 if (tb[DEV_L3_DEVICE])
 163                         name = blobmsg_data(tb[DEV_L3_DEVICE]);
 164                 else if (tb[DEV_DEVICE])
 165                         name = blobmsg_data(tb[DEV_DEVICE]);
 166                 else
 167                         continue;
 168
 169                 break;
 170         }
 171
 172         if (!name)
 173                 return NULL;
 174
 175         dev = calloc(1, sizeof(*dev));
 176
 177         if (!dev)
 178                 return NULL;
 179
 180         snprintf(dev->name, sizeof(dev->name), "%s", name);
 181         dev->set = true;
 182
 183         return dev;
 184 }
 185
 186 int
 187 fw3_ubus_address(struct list_head *list, const char *net)
 188 {
 189         enum {
 190                 ADDR_INTERFACE,
 191                 ADDR_IPV4,
 192                 ADDR_IPV6,
 193                 ADDR_IPV6_PREFIX,
 194                 __ADDR_MAX
 195         };
 196         static const struct blobmsg_policy policy[__ADDR_MAX] = {
 197                 [ADDR_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 198                 [ADDR_IPV4] = { "ipv4-address", BLOBMSG_TYPE_ARRAY },
 199                 [ADDR_IPV6] = { "ipv6-address", BLOBMSG_TYPE_ARRAY },
 200                 [ADDR_IPV6_PREFIX] = { "ipv6-prefix-assignment", BLOBMSG_TYPE_ARRAY },
 201         };
 202         struct blob_attr *tb[__ADDR_MAX];
 203         struct blob_attr *cur;
 204         int rem, n = 0;
 205
 206         if (!net || !interfaces)
 207                 return 0;
 208
 209         blobmsg_for_each_attr(cur, interfaces, rem) {
 210                 blobmsg_parse(policy, __ADDR_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 211
 212                 if (!tb[ADDR_INTERFACE] ||
 213                     strcmp(blobmsg_data(tb[ADDR_INTERFACE]), net) != 0)
 214                         continue;
 215
 216                 n += parse_subnets(list, FW3_FAMILY_V4, tb[ADDR_IPV4]);
 217                 n += parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6]);
 218                 n += parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6_PREFIX]);
 219         }
 220
 221         return n;
 222 }
 223
 224 void
 225 fw3_ubus_zone_devices(struct fw3_zone *zone)
 226 {
 227         struct blob_attr *c, *cur, *dcur;
 228         unsigned r, rem, drem;
 229         const char *name;
 230         bool matches;
 231
 232         blobmsg_for_each_attr(c, interfaces, r) {
 233                 name = NULL;
 234                 matches = false;
 235
 236                 blobmsg_for_each_attr(cur, c, rem) {
 237                         if (!strcmp(blobmsg_name(cur), "interface"))
 238                                 name = blobmsg_get_string(cur);
 239                         else if (!strcmp(blobmsg_name(cur), "data"))
 240                                 blobmsg_for_each_attr(dcur, cur, drem)
 241                                         if (!strcmp(blobmsg_name(dcur), "zone"))
 242                                                 matches = !strcmp(blobmsg_get_string(dcur), zone->name);
 243                 }
 244
 245                 if (name && matches)
 246                         fw3_parse_device(&zone->networks, name, true);
 247         }
 248 }
 249
 250 static void fw3_ubus_rules_add(struct blob_buf *b, const char *service,
 251                 const char *instance, const char *device,
 252                 const struct blob_attr *rule, unsigned n)
 253 {
 254         void *k = blobmsg_open_table(b, "");
 255         struct blob_attr *ropt;
 256         unsigned orem;
 257         char *type = NULL;
 258         char comment[256];
 259
 260         blobmsg_for_each_attr(ropt, rule, orem) {
 261                 if (!strcmp(blobmsg_name(ropt), "type"))
 262                         type = blobmsg_data(ropt);
 263                 if (device && !strcmp(blobmsg_name(ropt), "device"))
 264                         device = blobmsg_get_string(ropt);
 265                 else if (strcmp(blobmsg_name(ropt), "name"))
 266                         blobmsg_add_blob(b, ropt);
 267         }
 268
 269         if (instance)
 270                 snprintf(comment, sizeof(comment), "ubus:%s[%s] %s %d",
 271                                 service, instance, type ? type : "rule", n);
 272         else
 273                 snprintf(comment, sizeof(comment), "ubus:%s %s %d",
 274                                 service, type ? type : "rule", n);
 275
 276         blobmsg_add_string(b, "name", comment);
 277
 278         if (device)
 279                 blobmsg_add_string(b, "device", device);
 280
 281         blobmsg_close_table(b, k);
 282 }
 283
 284 void
 285 fw3_ubus_rules(struct blob_buf *b)
 286 {
 287         blob_buf_init(b, 0);
 288
 289         struct blob_attr *c, *cur, *dcur, *rule;
 290         unsigned n, r, rem, drem, rrem;
 291
 292         blobmsg_for_each_attr(c, interfaces, r) {
 293                 const char *l3_device = NULL;
 294                 const char *iface_proto = "unknown";
 295                 const char *iface_name = "unknown";
 296                 struct blob_attr *data = NULL;
 297
 298                 blobmsg_for_each_attr(cur, c, rem) {
 299                         if (!strcmp(blobmsg_name(cur), "l3_device"))
 300                                 l3_device = blobmsg_get_string(cur);
 301                         else if (!strcmp(blobmsg_name(cur), "interface"))
 302                                 iface_name = blobmsg_get_string(cur);
 303                         else if (!strcmp(blobmsg_name(cur), "proto"))
 304                                 iface_proto = blobmsg_get_string(cur);
 305                         else if (!strcmp(blobmsg_name(cur), "data"))
 306                                 data = cur;
 307                 }
 308
 309                 if (!data || !l3_device)
 310                         continue;
 311
 312                 blobmsg_for_each_attr(dcur, data, drem) {
 313                         if (strcmp(blobmsg_name(dcur), "firewall"))
 314                                 continue;
 315
 316                         n = 0;
 317
 318                         blobmsg_for_each_attr(rule, dcur, rrem)
 319                                 fw3_ubus_rules_add(b, iface_name, iface_proto,
 320                                         l3_device, rule, n++);
 321                 }
 322         }
 323
 324         if (!procd_data)
 325                 return;
 326
 327         /* service */
 328         blobmsg_for_each_attr(c, procd_data, r) {
 329                 if (!blobmsg_check_attr(c, true))
 330                         continue;
 331
 332                 /* instance */
 333                 blobmsg_for_each_attr(cur, c, rem) {
 334                         if (!blobmsg_check_attr(cur, true))
 335                                 continue;
 336
 337                         /* fw rules within the service itself */
 338                         if (!strcmp(blobmsg_name(cur), "firewall")) {
 339                                 n = 0;
 340
 341                                 blobmsg_for_each_attr(rule, cur, rrem)
 342                                         fw3_ubus_rules_add(b, blobmsg_name(c),
 343                                                 NULL, NULL, rule, n++);
 344
 345                                 continue;
 346                         }
 347
 348                         /* type */
 349                         blobmsg_for_each_attr(dcur, cur, drem) {
 350                                 if (!blobmsg_check_attr(dcur, true))
 351                                         continue;
 352
 353                                 if (strcmp(blobmsg_name(dcur), "firewall"))
 354                                         continue;
 355
 356                                 n = 0;
 357
 358                                 blobmsg_for_each_attr(rule, dcur, rrem)
 359                                         fw3_ubus_rules_add(b, blobmsg_name(c),
 360                                                 blobmsg_name(cur), NULL, rule, n++);
 361                         }
 362                 }
 363         }
 364 }