proto-static.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4
   5 #include <arpa/inet.h>
   6 #include <netinet/in.h>
   7
   8 #include "netifd.h"
   9 #include "interface.h"
  10 #include "interface-ip.h"
  11 #include "proto.h"
  12 #include "system.h"
  13
  14 enum {
  15         OPT_IPADDR,
  16         OPT_IP6ADDR,
  17         OPT_NETMASK,
  18         OPT_GATEWAY,
  19         OPT_IP6GW,
  20         __OPT_MAX,
  21 };
  22
  23 static const struct blobmsg_policy static_attrs[__OPT_MAX] = {
  24         [OPT_IPADDR] = { .name = "ipaddr", .type = BLOBMSG_TYPE_ARRAY },
  25         [OPT_IP6ADDR] = { .name = "ip6addr", .type = BLOBMSG_TYPE_ARRAY },
  26         [OPT_NETMASK] = { .name = "netmask", .type = BLOBMSG_TYPE_STRING },
  27         [OPT_GATEWAY] = { .name = "gateway", .type = BLOBMSG_TYPE_STRING },
  28         [OPT_IP6GW] = { .name = "ip6gw", .type = BLOBMSG_TYPE_STRING },
  29 };
  30
  31 static const union config_param_info static_attr_info[__OPT_MAX] = {
  32         [OPT_IPADDR] = { .type = BLOBMSG_TYPE_STRING },
  33         [OPT_IP6ADDR] = { .type = BLOBMSG_TYPE_STRING },
  34 };
  35
  36 static const struct config_param_list static_attr_list = {
  37         .n_params = __OPT_MAX,
  38         .params = static_attrs,
  39         .info = static_attr_info,
  40 };
  41
  42 struct static_proto_state {
  43         struct interface_proto_state proto;
  44
  45         struct blob_attr *config;
  46 };
  47
  48 static bool
  49 split_netmask(char *str, unsigned int *netmask)
  50 {
  51         char *delim, *err = NULL;
  52
  53         delim = strchr(str, '/');
  54         if (delim) {
  55                 *(delim++) = 0;
  56
  57                 *netmask = strtoul(delim, &err, 10);
  58                 if (err && *err)
  59                         return false;
  60         }
  61         return true;
  62 }
  63
  64 static int
  65 parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
  66 {
  67         char *astr = alloca(strlen(str) + 1);
  68
  69         strcpy(astr, str);
  70         if (!split_netmask(astr, netmask))
  71                 return 0;
  72
  73         if (af == AF_INET6) {
  74                 if (*netmask > 128)
  75                         return 0;
  76         } else {
  77                 if (*netmask > 32)
  78                         return 0;
  79         }
  80
  81         return inet_pton(af, str, addr);
  82 }
  83
  84 static bool
  85 parse_addr(struct interface_proto_state *state, const char *str, bool v6, int mask)
  86 {
  87         struct device_addr *addr;
  88         int af = v6 ? AF_INET6 : AF_INET;
  89
  90         addr = calloc(1, sizeof(*addr));
  91         addr->flags = v6 ? DEVADDR_INET6 : DEVADDR_INET4;
  92         addr->mask = mask;
  93         if (!parse_ip_and_netmask(af, str, &addr->addr, &addr->mask)) {
  94                 interface_add_error(state->iface, "proto-static", "INVALID_ADDRESS", &str, 1);
  95                 free(addr);
  96                 return false;
  97         }
  98         vlist_add(&state->iface->proto_addr, &addr->node);
  99         return true;
 100 }
 101
 102 static int
 103 parse_address_option(struct interface_proto_state *state, struct blob_attr *attr, bool v6, int netmask)
 104 {
 105         struct blob_attr *cur;
 106         int n_addr = 0;
 107         int rem;
 108
 109         blobmsg_for_each_attr(cur, attr, rem) {
 110                 n_addr++;
 111                 if (!parse_addr(state, blobmsg_data(cur), v6, netmask))
 112                         return -1;
 113         }
 114
 115         return n_addr;
 116 }
 117
 118 static bool
 119 parse_gateway_option(struct interface_proto_state *state, struct blob_attr *attr, bool v6)
 120 {
 121         struct device_route *route;
 122         const char *str = blobmsg_data(attr);
 123         int af = v6 ? AF_INET6 : AF_INET;
 124
 125         route = calloc(1, sizeof(*route));
 126         if (!inet_pton(af, str, &route->nexthop)) {
 127                 interface_add_error(state->iface, "proto-static",
 128                                 "INVALID_GATEWAY", &str, 1);
 129                 free(route);
 130                 return false;
 131         }
 132         route->mask = 0;
 133         route->flags = DEVADDR_DEVICE | (v6 ? DEVADDR_INET6 : DEVADDR_INET4);
 134         vlist_add(&state->iface->proto_route, &route->node);
 135
 136         return true;
 137 }
 138
 139 int
 140 proto_apply_static_settings(struct interface_proto_state *state, struct blob_attr *attr)
 141 {
 142         struct blob_attr *tb[__OPT_MAX];
 143         struct in_addr ina;
 144         const char *error;
 145         int netmask = 32;
 146         int n_v4 = 0, n_v6 = 0;
 147
 148         blobmsg_parse(static_attrs, __OPT_MAX, tb, blob_data(attr), blob_len(attr));
 149
 150         if (tb[OPT_NETMASK]) {
 151                 if (!inet_aton(blobmsg_data(tb[OPT_NETMASK]), &ina)) {
 152                         error = "INVALID_NETMASK";
 153                         goto error;
 154                 }
 155
 156                 netmask = 32 - fls(~(ntohl(ina.s_addr)));
 157         }
 158
 159         if (tb[OPT_IPADDR])
 160                 n_v4 = parse_address_option(state, tb[OPT_IPADDR], false, netmask);
 161
 162         if (tb[OPT_IP6ADDR])
 163                 n_v6 = parse_address_option(state, tb[OPT_IP6ADDR], true, netmask);
 164
 165         if (!n_v4 && !n_v6) {
 166                 error = "NO_ADDRESS";
 167                 goto error;
 168         }
 169
 170         if (n_v4 < 0 || n_v6 < 0)
 171                 goto out;
 172
 173         if (n_v4 && tb[OPT_GATEWAY]) {
 174                 if (!parse_gateway_option(state, tb[OPT_GATEWAY], false))
 175                         goto out;
 176         }
 177
 178         if (n_v6 && tb[OPT_IP6GW]) {
 179                 if (!parse_gateway_option(state, tb[OPT_IP6GW], true))
 180                         goto out;
 181         }
 182
 183         return 0;
 184
 185 error:
 186         interface_add_error(state->iface, "proto-static", error, NULL, 0);
 187 out:
 188         return -1;
 189 }
 190
 191 static bool
 192 static_proto_setup(struct static_proto_state *state)
 193 {
 194         return proto_apply_static_settings(&state->proto, state->config) == 0;
 195 }
 196
 197 static int
 198 static_handler(struct interface_proto_state *proto,
 199                enum interface_proto_cmd cmd, bool force)
 200 {
 201         struct static_proto_state *state;
 202         int ret = 0;
 203
 204         state = container_of(proto, struct static_proto_state, proto);
 205
 206         switch (cmd) {
 207         case PROTO_CMD_SETUP:
 208                 if (!static_proto_setup(state))
 209                         return -1;
 210
 211                 break;
 212         case PROTO_CMD_TEARDOWN:
 213                 break;
 214         }
 215         return ret;
 216 }
 217
 218 static void
 219 static_free(struct interface_proto_state *proto)
 220 {
 221         struct static_proto_state *state;
 222
 223         state = container_of(proto, struct static_proto_state, proto);
 224         free(state->config);
 225         free(state);
 226 }
 227
 228 struct interface_proto_state *
 229 static_attach(const struct proto_handler *h, struct interface *iface,
 230               struct blob_attr *attr)
 231 {
 232         struct static_proto_state *state;
 233
 234         state = calloc(1, sizeof(*state));
 235         if (!state)
 236                 return NULL;
 237
 238         state->config = malloc(blob_pad_len(attr));
 239         if (!state->config)
 240                 goto error;
 241
 242         memcpy(state->config, attr, blob_pad_len(attr));
 243         state->proto.free = static_free;
 244         state->proto.cb = static_handler;
 245
 246         return &state->proto;
 247
 248 error:
 249         free(state);
 250         return NULL;
 251 }
 252
 253 static struct proto_handler static_proto = {
 254         .name = "static",
 255         .flags = PROTO_FLAG_IMMEDIATE,
 256         .config_params = &static_attr_list,
 257         .attach = static_attach,
 258 };
 259
 260 static void __init
 261 static_proto_init(void)
 262 {
 263         add_proto_handler(&static_proto);
 264 }