ubus.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   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, 500))
  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_data(cur), &addr->address.v6);
  98
  99                 else if (!strcmp(blobmsg_name(cur), "mask"))
 100                         addr->mask = be32_to_cpu(*(uint32_t *)blobmsg_data(cur));
 101         }
 102
 103         return addr;
 104 }
 105
 106 static void
 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;
 113
 114         if (!list)
 115                 return;
 116
 117         blob_for_each_attr(cur, list, rem)
 118         {
 119                 addr = parse_subnet(family, blobmsg_data(cur), blobmsg_data_len(cur));
 120
 121                 if (addr)
 122                         list_add_tail(&addr->list, head);
 123         }
 124 }
 125
 126 struct fw3_device *
 127 fw3_ubus_device(const char *net)
 128 {
 129         enum {
 130                 DEV_INTERFACE,
 131                 DEV_DEVICE,
 132                 DEV_L3_DEVICE,
 133                 __DEV_MAX
 134         };
 135         static const struct blobmsg_policy policy[__DEV_MAX] = {
 136                 [DEV_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 137                 [DEV_DEVICE] = { "device", BLOBMSG_TYPE_STRING },
 138                 [DEV_L3_DEVICE] = { "l3_device", BLOBMSG_TYPE_STRING },
 139         };
 140         struct fw3_device *dev = NULL;
 141         struct blob_attr *tb[__DEV_MAX];
 142         struct blob_attr *cur;
 143         int rem;
 144
 145         if (!net || !interfaces)
 146                 return NULL;
 147
 148         dev = calloc(1, sizeof(*dev));
 149         if (!dev)
 150                 return NULL;
 151
 152         blobmsg_for_each_attr(cur, interfaces, rem) {
 153                 char *name;
 154
 155                 blobmsg_parse(policy, __DEV_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 156                 if (!tb[DEV_INTERFACE] ||
 157                     strcmp(blobmsg_data(tb[DEV_INTERFACE]), net) != 0)
 158                         continue;
 159
 160                 if (tb[DEV_L3_DEVICE])
 161                         name = blobmsg_data(tb[DEV_L3_DEVICE]);
 162                 else if (tb[DEV_DEVICE])
 163                         name = blobmsg_data(tb[DEV_DEVICE]);
 164                 else
 165                         continue;
 166
 167                 snprintf(dev->name, sizeof(dev->name), "%s", name);
 168                 dev->set = !!dev->name[0];
 169                 return dev;
 170         }
 171
 172         return NULL;
 173 }
 174
 175 void
 176 fw3_ubus_address(struct list_head *list, const char *net)
 177 {
 178         enum {
 179                 ADDR_INTERFACE,
 180                 ADDR_IPV4,
 181                 ADDR_IPV6,
 182                 ADDR_IPV6_PREFIX,
 183                 __ADDR_MAX
 184         };
 185         static const struct blobmsg_policy policy[__ADDR_MAX] = {
 186                 [ADDR_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 187                 [ADDR_IPV4] = { "ipv4-address", BLOBMSG_TYPE_ARRAY },
 188                 [ADDR_IPV6] = { "ipv6-address", BLOBMSG_TYPE_ARRAY },
 189                 [ADDR_IPV6_PREFIX] = { "ipv6-prefix-assignment", BLOBMSG_TYPE_ARRAY },
 190         };
 191         struct blob_attr *tb[__ADDR_MAX];
 192         struct blob_attr *cur;
 193         int rem;
 194
 195         if (!net || !interfaces)
 196                 return;
 197
 198         blobmsg_for_each_attr(cur, interfaces, rem) {
 199                 blobmsg_parse(policy, __ADDR_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 200
 201                 if (!tb[ADDR_INTERFACE] ||
 202                     strcmp(blobmsg_data(tb[ADDR_INTERFACE]), net) != 0)
 203                         continue;
 204
 205                 parse_subnets(list, FW3_FAMILY_V4, tb[ADDR_IPV4]);
 206                 parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6]);
 207                 parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6_PREFIX]);
 208         }
 209 }
 210
 211 void
 212 fw3_ubus_zone_devices(struct fw3_zone *zone)
 213 {
 214         struct blob_attr *c, *cur, *dcur;
 215         unsigned r, rem, drem;
 216         const char *name;
 217         bool matches;
 218
 219         blobmsg_for_each_attr(c, interfaces, r) {
 220                 name = NULL;
 221                 matches = false;
 222
 223                 blobmsg_for_each_attr(cur, c, rem) {
 224                         if (!strcmp(blobmsg_name(cur), "interface"))
 225                                 name = blobmsg_get_string(cur);
 226                         else if (!strcmp(blobmsg_name(cur), "data"))
 227                                 blobmsg_for_each_attr(dcur, cur, drem)
 228                                         if (!strcmp(blobmsg_name(dcur), "zone"))
 229                                                 matches = !strcmp(blobmsg_get_string(dcur), zone->name);
 230                 }
 231
 232                 if (name && matches)
 233                         fw3_parse_device(&zone->networks, name, true);
 234         }
 235 }
 236
 237 void
 238 fw3_ubus_rules(struct blob_buf *b)
 239 {
 240         blob_buf_init(b, 0);
 241
 242         struct blob_attr *c, *cur, *dcur, *rule, *ropt;
 243         unsigned r, rem, drem, rrem, orem;
 244
 245         blobmsg_for_each_attr(c, interfaces, r) {
 246                 const char *l3_device = NULL;
 247                 struct blob_attr *data = NULL;
 248
 249                 blobmsg_for_each_attr(cur, c, rem) {
 250                         if (!strcmp(blobmsg_name(cur), "l3_device"))
 251                                 l3_device = blobmsg_get_string(cur);
 252                         else if (!strcmp(blobmsg_name(cur), "data"))
 253                                 data = cur;
 254                 }
 255
 256                 if (!data || !l3_device)
 257                         continue;
 258
 259                 blobmsg_for_each_attr(dcur, data, drem) {
 260                         if (strcmp(blobmsg_name(dcur), "firewall"))
 261                                 continue;
 262
 263                         blobmsg_for_each_attr(rule, dcur, rrem) {
 264                                 void *k = blobmsg_open_table(b, "");
 265
 266                                 blobmsg_for_each_attr(ropt, rule, orem)
 267                                         if (strcmp(blobmsg_name(ropt), "device"))
 268                                                 blobmsg_add_blob(b, ropt);
 269
 270                                 blobmsg_add_string(b, "device", l3_device);
 271                                 blobmsg_close_table(b, k);
 272                         }
 273                 }
 274         }
 275
 276         if (!procd_data)
 277                 return;
 278
 279         /* service */
 280         blobmsg_for_each_attr(c, procd_data, r) {
 281                 if (!blobmsg_check_attr(c, true))
 282                         continue;
 283
 284                 /* instance */
 285                 blobmsg_for_each_attr(cur, c, rem) {
 286                         if (!blobmsg_check_attr(cur, true))
 287                                 continue;
 288
 289                         /* type */
 290                         blobmsg_for_each_attr(dcur, cur, drem) {
 291                                 if (!blobmsg_check_attr(dcur, true))
 292                                         continue;
 293
 294                                 blobmsg_for_each_attr(rule, dcur, rrem)
 295                                         blobmsg_add_blob(b, rule);
 296                         }
 297                 }
 298         }
 299 }