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
  23
  24 static void dump_cb(struct ubus_request *req, int type, struct blob_attr *msg)
  25 {
  26         static const struct blobmsg_policy policy = { "interface", BLOBMSG_TYPE_ARRAY };
  27         struct blob_attr *cur;
  28
  29         blobmsg_parse(&policy, 1, &cur, blob_data(msg), blob_len(msg));
  30         if (cur)
  31                 interfaces = blob_memdup(cur);
  32 }
  33
  34 bool
  35 fw3_ubus_connect(void)
  36 {
  37         bool status = false;
  38         uint32_t id;
  39         struct ubus_context *ctx = ubus_connect(NULL);
  40
  41         if (!ctx)
  42                 goto out;
  43
  44         if (ubus_lookup_id(ctx, "network.interface", &id))
  45                 goto out;
  46
  47         if (ubus_invoke(ctx, id, "dump", NULL, dump_cb, NULL, 500))
  48                 goto out;
  49
  50         status = true;
  51
  52 out:
  53         if (ctx)
  54                 ubus_free(ctx);
  55         return status;
  56 }
  57
  58 void
  59 fw3_ubus_disconnect(void)
  60 {
  61         free(interfaces);
  62         interfaces = NULL;
  63 }
  64
  65 static struct fw3_address *
  66 parse_subnet(enum fw3_family family, struct blob_attr *dict, int rem)
  67 {
  68         struct blob_attr *cur;
  69         struct fw3_address *addr;
  70
  71         addr = calloc(1, sizeof(*addr));
  72         if (!addr)
  73                 return NULL;
  74
  75         addr->set = true;
  76         addr->family = family;
  77
  78         __blob_for_each_attr(cur, dict, rem)
  79         {
  80                 if (!strcmp(blobmsg_name(cur), "address"))
  81                         inet_pton(family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
  82                                   blobmsg_data(cur), &addr->address.v6);
  83
  84                 else if (!strcmp(blobmsg_name(cur), "mask"))
  85                         addr->mask = be32_to_cpu(*(uint32_t *)blobmsg_data(cur));
  86         }
  87
  88         return addr;
  89 }
  90
  91 static void
  92 parse_subnets(struct list_head *head, enum fw3_family family,
  93               struct blob_attr *list)
  94 {
  95         struct blob_attr *cur;
  96         struct fw3_address *addr;
  97         int rem;
  98
  99         if (!list)
 100                 return;
 101
 102         blob_for_each_attr(cur, list, rem)
 103         {
 104                 addr = parse_subnet(family, blobmsg_data(cur), blobmsg_data_len(cur));
 105
 106                 if (addr)
 107                         list_add_tail(&addr->list, head);
 108         }
 109 }
 110
 111 struct fw3_device *
 112 fw3_ubus_device(const char *net)
 113 {
 114         struct fw3_device *dev = NULL;
 115         struct blob_attr *c, *cur;
 116         unsigned r, rem;
 117         char *data;
 118         bool matched;
 119
 120         if (!net || !interfaces)
 121                 return NULL;
 122
 123         dev = calloc(1, sizeof(*dev));
 124         if (!dev)
 125                 return NULL;
 126
 127         blobmsg_for_each_attr(c, interfaces, r) {
 128                 matched = false;
 129                 blobmsg_for_each_attr(cur, c, rem)
 130                         if (!strcmp(blobmsg_name(cur), "interface"))
 131                                 matched = !strcmp(blobmsg_get_string(cur), net);
 132
 133                 if (!matched)
 134                         continue;
 135
 136                 blobmsg_for_each_attr(cur, c, rem) {
 137                         data = blobmsg_data(cur);
 138
 139                         if (!strcmp(blobmsg_name(cur), "device") && !dev->name[0])
 140                                 snprintf(dev->name, sizeof(dev->name), "%s", data);
 141                         else if (!strcmp(blobmsg_name(cur), "l3_device"))
 142                                 snprintf(dev->name, sizeof(dev->name), "%s", data);
 143                 }
 144
 145                 dev->set = !!dev->name[0];
 146                 return dev;
 147         }
 148
 149         return NULL;
 150 }
 151
 152 void
 153 fw3_ubus_address(struct list_head *list, const char *net)
 154 {
 155         enum {
 156                 ADDR_INTERFACE,
 157                 ADDR_IPV4,
 158                 ADDR_IPV6,
 159                 ADDR_IPV6_PREFIX,
 160                 __ADDR_MAX
 161         };
 162         static const struct blobmsg_policy policy[__ADDR_MAX] = {
 163                 [ADDR_INTERFACE] = { "interface", BLOBMSG_TYPE_STRING },
 164                 [ADDR_IPV4] = { "ipv4-address", BLOBMSG_TYPE_ARRAY },
 165                 [ADDR_IPV6] = { "ipv6-address", BLOBMSG_TYPE_ARRAY },
 166                 [ADDR_IPV6_PREFIX] = { "ipv6-prefix-assignment", BLOBMSG_TYPE_ARRAY },
 167         };
 168         struct blob_attr *tb[__ADDR_MAX];
 169         struct blob_attr *cur;
 170         int rem;
 171
 172         if (!net || !interfaces)
 173                 return;
 174
 175         blobmsg_for_each_attr(cur, interfaces, rem) {
 176                 blobmsg_parse(policy, __ADDR_MAX, tb, blobmsg_data(cur), blobmsg_len(cur));
 177
 178                 if (!tb[ADDR_INTERFACE] ||
 179                     strcmp(blobmsg_data(tb[ADDR_INTERFACE]), net) != 0)
 180                         continue;
 181
 182                 parse_subnets(list, FW3_FAMILY_V4, tb[ADDR_IPV4]);
 183                 parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6]);
 184                 parse_subnets(list, FW3_FAMILY_V6, tb[ADDR_IPV6_PREFIX]);
 185         }
 186 }
 187
 188 void
 189 fw3_ubus_zone_devices(struct fw3_zone *zone)
 190 {
 191         struct blob_attr *c, *cur, *dcur;
 192         unsigned r, rem, drem;
 193         const char *name;
 194         bool matches;
 195
 196         blobmsg_for_each_attr(c, interfaces, r) {
 197                 name = NULL;
 198                 matches = false;
 199
 200                 blobmsg_for_each_attr(cur, c, rem) {
 201                         if (!strcmp(blobmsg_name(cur), "interface"))
 202                                 name = blobmsg_get_string(cur);
 203                         else if (!strcmp(blobmsg_name(cur), "data"))
 204                                 blobmsg_for_each_attr(dcur, cur, drem)
 205                                         if (!strcmp(blobmsg_name(dcur), "zone"))
 206                                                 matches = !strcmp(blobmsg_get_string(dcur), zone->name);
 207                 }
 208
 209                 if (name && matches)
 210                         fw3_parse_device(&zone->networks, name, true);
 211         }
 212 }
 213
 214 void
 215 fw3_ubus_rules(struct blob_buf *b)
 216 {
 217         blob_buf_init(b, 0);
 218
 219         struct blob_attr *c, *cur, *dcur, *rule, *ropt;
 220         unsigned r, rem, drem, rrem, orem;
 221
 222         blobmsg_for_each_attr(c, interfaces, r) {
 223                 const char *l3_device = NULL;
 224                 struct blob_attr *data = NULL;
 225
 226                 blobmsg_for_each_attr(cur, c, rem) {
 227                         if (!strcmp(blobmsg_name(cur), "l3_device"))
 228                                 l3_device = blobmsg_get_string(cur);
 229                         else if (!strcmp(blobmsg_name(cur), "data"))
 230                                 data = cur;
 231                 }
 232
 233                 if (!data || !l3_device)
 234                         continue;
 235
 236                 blobmsg_for_each_attr(dcur, data, drem) {
 237                         if (strcmp(blobmsg_name(dcur), "firewall"))
 238                                 continue;
 239
 240                         blobmsg_for_each_attr(rule, dcur, rrem) {
 241                                 void *k = blobmsg_open_table(b, "");
 242
 243                                 blobmsg_for_each_attr(ropt, rule, orem)
 244                                         if (strcmp(blobmsg_name(ropt), "device"))
 245                                                 blobmsg_add_blob(b, ropt);
 246
 247                                 blobmsg_add_string(b, "device", l3_device);
 248                                 blobmsg_close_table(b, k);
 249                         }
 250                 }
 251         }
 252 }