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, int rem)
  94 {
  95         struct blob_attr *cur;
  96         struct fw3_address *addr;
  97
  98         __blob_for_each_attr(cur, list, rem)
  99         {
 100                 addr = parse_subnet(family, blobmsg_data(cur), blobmsg_data_len(cur));
 101
 102                 if (addr)
 103                         list_add_tail(&addr->list, head);
 104         }
 105 }
 106
 107 static void *
 108 invoke_common(const char *net, bool device)
 109 {
 110         struct fw3_device *dev = NULL;
 111         struct list_head *addr = NULL;
 112         struct blob_attr *c, *cur;
 113         unsigned r, rem;
 114         char *data;
 115         bool matched;
 116
 117         if (!net || !interfaces)
 118                 return NULL;
 119
 120         if (device)
 121                 dev = calloc(1, sizeof(*dev));
 122         else
 123                 addr = malloc(sizeof(*addr));
 124
 125         if ((device && !dev) || (!device && !addr))
 126                 goto fail;
 127
 128         if (!device)
 129                 INIT_LIST_HEAD(addr);
 130
 131         blobmsg_for_each_attr(c, interfaces, r) {
 132                 matched = false;
 133                 blobmsg_for_each_attr(cur, c, rem)
 134                         if (!strcmp(blobmsg_name(cur), "interface"))
 135                                 matched = !strcmp(blobmsg_get_string(cur), net);
 136
 137                 if (!matched)
 138                         continue;
 139
 140                 blobmsg_for_each_attr(cur, c, rem) {
 141                         data = blobmsg_data(cur);
 142
 143                         if (dev && !strcmp(blobmsg_name(cur), "device") && !dev->name[0])
 144                                 snprintf(dev->name, sizeof(dev->name), "%s", data);
 145                         else if (dev && !strcmp(blobmsg_name(cur), "l3_device"))
 146                                 snprintf(dev->name, sizeof(dev->name), "%s", data);
 147                         else if (!dev && !strcmp(blobmsg_name(cur), "ipv4-address"))
 148                                 parse_subnets(addr, FW3_FAMILY_V4,
 149                                               blobmsg_data(cur), blobmsg_data_len(cur));
 150                         else if (!dev && (!strcmp(blobmsg_name(cur), "ipv6-address") ||
 151                                           !strcmp(blobmsg_name(cur), "ipv6-prefix-assignment")))
 152                                 parse_subnets(addr, FW3_FAMILY_V6,
 153                                               blobmsg_data(cur), blobmsg_data_len(cur));
 154                 }
 155
 156                 if (dev)
 157                         dev->set = !!dev->name[0];
 158
 159                 break;
 160         }
 161
 162         if (device && dev->set)
 163                 return dev;
 164         else if (!device && !list_empty(addr))
 165                 return addr;
 166
 167 fail:
 168         free(dev);
 169         free(addr);
 170
 171         return NULL;
 172 }
 173
 174 struct fw3_device *
 175 fw3_ubus_device(const char *net)
 176 {
 177         return invoke_common(net, true);
 178 }
 179
 180 struct list_head *
 181 fw3_ubus_address(const char *net)
 182 {
 183         return invoke_common(net, false);
 184 }
 185
 186 void
 187 fw3_ubus_zone_devices(struct fw3_zone *zone)
 188 {
 189         struct blob_attr *c, *cur, *dcur;
 190         unsigned r, rem, drem;
 191         const char *name;
 192         bool matches;
 193
 194         blobmsg_for_each_attr(c, interfaces, r) {
 195                 name = NULL;
 196                 matches = false;
 197
 198                 blobmsg_for_each_attr(cur, c, rem) {
 199                         if (!strcmp(blobmsg_name(cur), "interface"))
 200                                 name = blobmsg_get_string(cur);
 201                         else if (!strcmp(blobmsg_name(cur), "data"))
 202                                 blobmsg_for_each_attr(dcur, cur, drem)
 203                                         if (!strcmp(blobmsg_name(dcur), "zone"))
 204                                                 matches = !strcmp(blobmsg_get_string(dcur), zone->name);
 205                 }
 206
 207                 if (name && matches)
 208                         fw3_parse_device(&zone->networks, name, true);
 209         }
 210 }
 211
 212 void
 213 fw3_ubus_rules(struct blob_buf *b)
 214 {
 215         blob_buf_init(b, 0);
 216
 217         struct blob_attr *c, *cur, *dcur, *rule, *ropt;
 218         unsigned r, rem, drem, rrem, orem;
 219
 220         blobmsg_for_each_attr(c, interfaces, r) {
 221                 const char *l3_device = NULL;
 222                 struct blob_attr *data = NULL;
 223
 224                 blobmsg_for_each_attr(cur, c, rem) {
 225                         if (!strcmp(blobmsg_name(cur), "l3_device"))
 226                                 l3_device = blobmsg_get_string(cur);
 227                         else if (!strcmp(blobmsg_name(cur), "data"))
 228                                 data = cur;
 229                 }
 230
 231                 if (!data || !l3_device)
 232                         continue;
 233
 234                 blobmsg_for_each_attr(dcur, data, drem) {
 235                         if (strcmp(blobmsg_name(dcur), "firewall"))
 236                                 continue;
 237
 238                         blobmsg_for_each_attr(rule, dcur, rrem) {
 239                                 void *k = blobmsg_open_table(b, "");
 240
 241                                 blobmsg_for_each_attr(ropt, rule, orem)
 242                                         if (strcmp(blobmsg_name(ropt), "device"))
 243                                                 blobmsg_add_blob(b, ropt);
 244
 245                                 blobmsg_add_string(b, "device", l3_device);
 246                                 blobmsg_close_table(b, k);
 247                         }
 248                 }
 249         }
 250 }