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, int rem)
 109 {
 110         struct blob_attr *cur;
 111         struct fw3_address *addr;
 112
 113         if (!list)
 114                 return;
 115
 116         __blob_for_each_attr(cur, list, rem)
 117         {
 118                 addr = parse_subnet(family, blobmsg_data(cur), blobmsg_data_len(cur));
 119
 120                 if (addr)
 121                         list_add_tail(&addr->list, head);
 122         }
 123 }
 124
 125 struct fw3_device *
 126 fw3_ubus_device(const char *net)
 127 {
 128         enum {
 129                 DEV_INTERFACE,
 130                 DEV_DEVICE,
 131                 DEV_L3_DEVICE,
 132                 __DEV_MAX
 133         };
 134         static const struct blobmsg_policy policy[__DEV_MAX] = {
 135                 [DEV_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 136                 [DEV_DEVICE] = { "device", BLOBMSG_TYPE_STRING },
 137                 [DEV_L3_DEVICE] = { "l3_device", BLOBMSG_TYPE_STRING },
 138         };
 139         struct fw3_device *dev = NULL;
 140         struct blob_attr *tb[__DEV_MAX];
 141         struct blob_attr *cur;
 142         char *name = NULL;
 143         int rem;
 144
 145         if (!net || !interfaces)
 146                 return NULL;
 147
 148         blobmsg_for_each_attr(cur, interfaces, rem) {
 149                 blobmsg_parse(policy, __DEV_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 150                 if (!tb[DEV_INTERFACE] ||
 151                     strcmp(blobmsg_data(tb[DEV_INTERFACE]), net) != 0)
 152                         continue;
 153
 154                 if (tb[DEV_L3_DEVICE])
 155                         name = blobmsg_data(tb[DEV_L3_DEVICE]);
 156                 else if (tb[DEV_DEVICE])
 157                         name = blobmsg_data(tb[DEV_DEVICE]);
 158                 else
 159                         continue;
 160
 161                 break;
 162         }
 163
 164         if (!name)
 165                 return NULL;
 166
 167         dev = calloc(1, sizeof(*dev));
 168
 169         if (!dev)
 170                 return NULL;
 171
 172         snprintf(dev->name, sizeof(dev->name), "%s", name);
 173         dev->set = true;
 174
 175         return dev;
 176 }
 177
 178 void
 179 fw3_ubus_address(struct list_head *list, const char *net)
 180 {
 181         enum {
 182                 ADDR_INTERFACE,
 183                 ADDR_IPV4,
 184                 ADDR_IPV6,
 185                 ADDR_IPV6_PREFIX,
 186                 __ADDR_MAX
 187         };
 188         static const struct blobmsg_policy policy[__ADDR_MAX] = {
 189                 [ADDR_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 190                 [ADDR_IPV4] = { "ipv4-address", BLOBMSG_TYPE_ARRAY },
 191                 [ADDR_IPV6] = { "ipv6-address", BLOBMSG_TYPE_ARRAY },
 192                 [ADDR_IPV6_PREFIX] = { "ipv6-prefix-assignment", BLOBMSG_TYPE_ARRAY },
 193         };
 194         struct blob_attr *tb[__ADDR_MAX];
 195         struct blob_attr *cur;
 196         int rem;
 197
 198         if (!net || !interfaces)
 199                 return;
 200
 201         blobmsg_for_each_attr(cur, interfaces, rem) {
 202                 blobmsg_parse(policy, __ADDR_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 203
 204                 if (!tb[ADDR_INTERFACE] ||
 205                     strcmp(blobmsg_data(tb[ADDR_INTERFACE]), net) != 0)
 206                         continue;
 207
 208                 parse_subnets(list, FW3_FAMILY_V4, blobmsg_data(tb[ADDR_IPV4]), blobmsg_data_len(tb[ADDR_IPV4]));
 209                 parse_subnets(list, FW3_FAMILY_V6, blobmsg_data(tb[ADDR_IPV6]), blobmsg_data_len(tb[ADDR_IPV6]));
 210                 parse_subnets(list, FW3_FAMILY_V6, blobmsg_data(tb[ADDR_IPV6_PREFIX]), blobmsg_data_len(tb[ADDR_IPV6_PREFIX]));
 211         }
 212 }
 213
 214 void
 215 fw3_ubus_zone_devices(struct fw3_zone *zone)
 216 {
 217         struct blob_attr *c, *cur, *dcur;
 218         unsigned r, rem, drem;
 219         const char *name;
 220         bool matches;
 221
 222         blobmsg_for_each_attr(c, interfaces, r) {
 223                 name = NULL;
 224                 matches = false;
 225
 226                 blobmsg_for_each_attr(cur, c, rem) {
 227                         if (!strcmp(blobmsg_name(cur), "interface"))
 228                                 name = blobmsg_get_string(cur);
 229                         else if (!strcmp(blobmsg_name(cur), "data"))
 230                                 blobmsg_for_each_attr(dcur, cur, drem)
 231                                         if (!strcmp(blobmsg_name(dcur), "zone"))
 232                                                 matches = !strcmp(blobmsg_get_string(dcur), zone->name);
 233                 }
 234
 235                 if (name && matches)
 236                         fw3_parse_device(&zone->networks, name, true);
 237         }
 238 }
 239
 240 void
 241 fw3_ubus_rules(struct blob_buf *b)
 242 {
 243         blob_buf_init(b, 0);
 244
 245         struct blob_attr *c, *cur, *dcur, *rule, *ropt;
 246         unsigned r, rem, drem, rrem, orem;
 247
 248         blobmsg_for_each_attr(c, interfaces, r) {
 249                 const char *l3_device = NULL;
 250                 struct blob_attr *data = NULL;
 251
 252                 blobmsg_for_each_attr(cur, c, rem) {
 253                         if (!strcmp(blobmsg_name(cur), "l3_device"))
 254                                 l3_device = blobmsg_get_string(cur);
 255                         else if (!strcmp(blobmsg_name(cur), "data"))
 256                                 data = cur;
 257                 }
 258
 259                 if (!data || !l3_device)
 260                         continue;
 261
 262                 blobmsg_for_each_attr(dcur, data, drem) {
 263                         if (strcmp(blobmsg_name(dcur), "firewall"))
 264                                 continue;
 265
 266                         blobmsg_for_each_attr(rule, dcur, rrem) {
 267                                 void *k = blobmsg_open_table(b, "");
 268
 269                                 blobmsg_for_each_attr(ropt, rule, orem)
 270                                         if (strcmp(blobmsg_name(ropt), "device"))
 271                                                 blobmsg_add_blob(b, ropt);
 272
 273                                 blobmsg_add_string(b, "device", l3_device);
 274                                 blobmsg_close_table(b, k);
 275                         }
 276                 }
 277         }
 278
 279         if (!procd_data)
 280                 return;
 281
 282         /* service */
 283         blobmsg_for_each_attr(c, procd_data, r) {
 284                 if (!blobmsg_check_attr(c, true))
 285                         continue;
 286
 287                 /* instance */
 288                 blobmsg_for_each_attr(cur, c, rem) {
 289                         if (!blobmsg_check_attr(cur, true))
 290                                 continue;
 291
 292                         /* type */
 293                         blobmsg_for_each_attr(dcur, cur, drem) {
 294                                 if (!blobmsg_check_attr(dcur, true))
 295                                         continue;
 296
 297                                 blobmsg_for_each_attr(rule, dcur, rrem)
 298                                         blobmsg_add_blob(b, rule);
 299                         }
 300                 }
 301         }
 302 }