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 "proto.h"
  11 #include "system.h"
  12
  13 struct v4_addr {
  14         unsigned int prefix;
  15         struct in_addr addr;
  16 };
  17
  18 struct v6_addr {
  19         unsigned int prefix;
  20         struct in6_addr addr;
  21 };
  22
  23 struct static_proto_state {
  24     struct interface_proto_state proto;
  25         struct interface *iface;
  26
  27         int n_v4;
  28         struct v4_addr *v4;
  29
  30         int n_v6;
  31         struct v4_addr *v6;
  32 };
  33
  34 static int
  35 static_handler(struct interface_proto_state *proto,
  36                enum interface_proto_cmd cmd, bool force)
  37 {
  38         struct static_proto_state *state;
  39         struct device *dev;
  40         int ret = 0;
  41         int i;
  42
  43         state = container_of(proto, struct static_proto_state, proto);
  44         dev = state->iface->main_dev.dev;
  45
  46         switch (cmd) {
  47         case PROTO_CMD_SETUP:
  48                 for (i = 0; i < state->n_v4; i++) {
  49                         if (ret)
  50                                 break;
  51                         ret = system_add_address(dev, AF_INET,
  52                                 &state->v4[i].addr, state->v4[i].prefix);
  53                 }
  54                 for (i = 0; i < state->n_v6; i++) {
  55                         if (ret)
  56                                 break;
  57                         ret = system_add_address(dev, AF_INET6,
  58                                 &state->v6[i].addr, state->v6[i].prefix);
  59                 }
  60
  61                 if (!ret)
  62                         return 0;
  63
  64                 interface_add_error(state->iface, "proto-static",
  65                         "SET_ADDRESS_FAILED", NULL, 0);
  66                 /* fall through */
  67
  68         case PROTO_CMD_TEARDOWN:
  69                 for (i = 0; i < state->n_v4; i++)
  70                         system_del_address(dev, AF_INET, &state->v4[i].addr);
  71                 for (i = 0; i < state->n_v6; i++)
  72                         system_del_address(dev, AF_INET6, &state->v6[i].addr);
  73                 break;
  74         }
  75         return ret;
  76 }
  77
  78 static void
  79 static_free(struct interface_proto_state *proto)
  80 {
  81         struct static_proto_state *state;
  82
  83         state = container_of(proto, struct static_proto_state, proto);
  84         free(state);
  85 }
  86
  87 struct interface_proto_state *
  88 static_create_state(struct interface *iface, struct v4_addr *v4, int n_v4, struct v6_addr *v6, int n_v6)
  89 {
  90         struct static_proto_state *state;
  91         int v4_len = sizeof(struct v4_addr) * n_v4;
  92         int v6_len = sizeof(struct v6_addr) * n_v6;
  93         void *next;
  94
  95         state = calloc(1, sizeof(*state) + v4_len + v6_len);
  96         state->iface = iface;
  97         state->proto.free = static_free;
  98         state->proto.handler = static_handler;
  99         state->proto.flags = PROTO_FLAG_IMMEDIATE;
 100         next = (void *) (state + 1);
 101
 102         if (n_v4) {
 103                 state->n_v4 = n_v4;
 104                 state->v4 = next;
 105                 memcpy(state->v4, v4, sizeof(*v4) * n_v4);
 106                 next = state->v4 + n_v4;
 107         }
 108
 109         if (n_v6) {
 110                 state->n_v6 = n_v6;
 111                 state->v6 = next;
 112                 memcpy(state->v6, v6, sizeof(*v6) * n_v6);
 113         }
 114
 115         return &state->proto;
 116 }
 117
 118 static bool
 119 split_netmask(char *str, unsigned int *netmask)
 120 {
 121         char *delim, *err = NULL;
 122
 123         delim = strchr(str, '/');
 124         if (delim) {
 125                 *(delim++) = 0;
 126
 127                 *netmask = strtoul(delim, &err, 10);
 128                 if (err && *err)
 129                         return false;
 130         }
 131         return true;
 132 }
 133
 134 static int
 135 parse_ip_and_netmask(int af, const char *str, void *addr, unsigned int *netmask)
 136 {
 137         char *astr = alloca(strlen(str) + 1);
 138
 139         strcpy(astr, str);
 140         if (!split_netmask(astr, netmask))
 141                 return 0;
 142
 143         if (af == AF_INET6) {
 144                 if (*netmask > 128)
 145                         return 0;
 146         } else {
 147                 if (*netmask > 32)
 148                         return 0;
 149         }
 150
 151         return inet_pton(af, str, addr);
 152 }
 153
 154 static int
 155 parse_v4(const char *str, struct v4_addr *v4, int netmask)
 156 {
 157         v4->prefix = netmask;
 158         return parse_ip_and_netmask(AF_INET, str, &v4->addr, &v4->prefix);
 159 }
 160
 161 static int
 162 parse_v6(const char *str, struct v6_addr *v6, int netmask)
 163 {
 164         v6->prefix = netmask;
 165         return parse_ip_and_netmask(AF_INET6, str, &v6->addr, &v6->prefix);
 166 }
 167
 168 static int
 169 count_list_entries(struct uci_option *o)
 170 {
 171         struct uci_element *e;
 172         int n = 0;
 173
 174         uci_foreach_element(&o->v.list, e)
 175                 n++;
 176
 177         return n;
 178 }
 179
 180 enum {
 181         OPT_IPADDR,
 182         OPT_IP6ADDR,
 183         OPT_NETMASK,
 184         OPT_GATEWAY,
 185         OPT_DNS,
 186         __OPT_MAX,
 187 };
 188
 189 static const struct uci_parse_option opts[__OPT_MAX] = {
 190         [OPT_IPADDR] = { .name = "ipaddr" },
 191         [OPT_IP6ADDR] = { .name = "ip6addr" },
 192         [OPT_NETMASK] = { .name = "netmask", .type = UCI_TYPE_STRING },
 193         [OPT_GATEWAY] = { .name = "gateway", .type = UCI_TYPE_STRING },
 194         [OPT_DNS] = { .name = "dns" },
 195 };
 196
 197 struct interface_proto_state *
 198 static_attach(struct proto_handler *h, struct interface *iface,
 199               struct uci_section *s)
 200 {
 201         struct uci_option *tb[__OPT_MAX];
 202         struct uci_element *e;
 203         struct v4_addr *v4 = NULL;
 204         struct v6_addr *v6 = NULL;
 205         int n_v4 = 0, n_v6 = 0;
 206         struct in_addr ina = {};
 207         const char *error = NULL;
 208         int netmask = 32;
 209         int i;
 210
 211         uci_parse_section(s, opts, __OPT_MAX, tb);
 212
 213         if (tb[OPT_NETMASK]) {
 214                 if (!inet_aton(tb[OPT_NETMASK]->v.string, &ina)) {
 215                         error = "INVALID_NETMASK";
 216                         goto error;
 217                 }
 218
 219                 netmask = 32 - fls(~(ntohl(ina.s_addr)));
 220         }
 221
 222         if (tb[OPT_IPADDR]) {
 223                 if (tb[OPT_IPADDR]->type == UCI_TYPE_STRING) {
 224                         n_v4 = 1;
 225                         v4 = alloca(sizeof(*v4));
 226                         if (!parse_v4(tb[OPT_IPADDR]->v.string, v4, netmask))
 227                                 goto invalid_addr;
 228                 } else {
 229                         i = 0;
 230                         n_v4 = count_list_entries(tb[OPT_IPADDR]);
 231                         v4 = alloca(sizeof(*v4) * n_v4);
 232                         uci_foreach_element(&tb[OPT_IPADDR]->v.list, e) {
 233                                 if (!parse_v4(e->name, &v4[i++], netmask))
 234                                         goto invalid_addr;
 235                         }
 236                 }
 237         }
 238
 239         if (tb[OPT_IP6ADDR]) {
 240                 if (tb[OPT_IP6ADDR]->type == UCI_TYPE_STRING) {
 241                         n_v6 = 1;
 242                         v6 = alloca(sizeof(*v6));
 243                         v6->prefix = netmask;
 244                         if (!parse_v6(tb[OPT_IP6ADDR]->v.string, v6, netmask))
 245                                 goto invalid_addr;
 246                 } else {
 247                         i = 0;
 248                         n_v6 = count_list_entries(tb[OPT_IP6ADDR]);
 249                         v6 = alloca(sizeof(*v6) * n_v6);
 250                         uci_foreach_element(&tb[OPT_IP6ADDR]->v.list, e) {
 251                                 if (!parse_v6(e->name, &v6[i++], netmask))
 252                                         goto invalid_addr;
 253                         }
 254                 }
 255         }
 256
 257
 258         if (!n_v4 && !n_v6) {
 259                 error = "NO_ADDRESS";
 260                 goto error;
 261         }
 262
 263         return static_create_state(iface, v4, n_v4, v6, n_v6);
 264
 265 invalid_addr:
 266         error = "INVALID_ADDRESS";
 267
 268 error:
 269         interface_add_error(iface, "proto-static", error, NULL, 0);
 270         return NULL;
 271 }
 272
 273 static struct proto_handler static_proto = {
 274         .name = "static",
 275         .attach = static_attach,
 276 };
 277
 278 static void __init
 279 static_proto_init(void)
 280 {
 281         add_proto_handler(&static_proto);
 282 }