src/odhcpd.h

   1 /**
   2  * Copyright (C) 2012-2013 Steven Barth <steven@midlink.org>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License v2 as published by
   6  * the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  */
  14
  15 #pragma once
  16 #include <netinet/in.h>
  17 #include <netinet/icmp6.h>
  18 #include <netinet/ether.h>
  19 #include <stdbool.h>
  20 #include <syslog.h>
  21
  22 #include <libubox/blobmsg.h>
  23 #include <libubox/list.h>
  24 #include <libubox/uloop.h>
  25 #include <libubox/avl.h>
  26 #include <libubox/ustream.h>
  27
  28 // RFC 6106 defines this router advertisement option
  29 #define ND_OPT_ROUTE_INFO 24
  30 #define ND_OPT_RECURSIVE_DNS 25
  31 #define ND_OPT_DNS_SEARCH 31
  32
  33 #define INFINITE_VALID(x) ((x) == 0)
  34
  35 #define _unused __attribute__((unused))
  36 #define _packed __attribute__((packed))
  37
  38 #define ALL_IPV6_NODES "ff02::1"
  39 #define ALL_IPV6_ROUTERS "ff02::2"
  40
  41 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
  42
  43 struct interface;
  44 struct nl_sock;
  45 extern struct list_head leases;
  46
  47 struct odhcpd_event {
  48         struct uloop_fd uloop;
  49         void (*handle_dgram)(void *addr, void *data, size_t len,
  50                         struct interface *iface, void *dest_addr);
  51         void (*handle_error)(struct odhcpd_event *e, int error);
  52         void (*recv_msgs)(struct odhcpd_event *e);
  53 };
  54
  55 union if_addr {
  56         struct in_addr in;
  57         struct in6_addr in6;
  58 };
  59
  60 struct netevent_handler_info {
  61         struct interface *iface;
  62         union {
  63                 struct {
  64                         union if_addr dst;
  65                         uint8_t dst_len;
  66                         union if_addr gateway;
  67                 } rt;
  68                 struct {
  69                         union if_addr dst;
  70                         uint16_t state;
  71                         uint8_t flags;
  72                 } neigh;
  73                 struct {
  74                         struct odhcpd_ipaddr *addrs;
  75                         size_t len;
  76                 } addrs_old;
  77                 union if_addr addr;
  78         };
  79 };
  80
  81 enum netevents {
  82         NETEV_IFINDEX_CHANGE,
  83         NETEV_ADDR_ADD,
  84         NETEV_ADDR_DEL,
  85         NETEV_ADDRLIST_CHANGE,
  86         NETEV_ADDR6_ADD,
  87         NETEV_ADDR6_DEL,
  88         NETEV_ADDR6LIST_CHANGE,
  89         NETEV_ROUTE6_ADD,
  90         NETEV_ROUTE6_DEL,
  91         NETEV_NEIGH6_ADD,
  92         NETEV_NEIGH6_DEL,
  93 };
  94
  95 struct netevent_handler {
  96         struct list_head head;
  97         void (*cb) (unsigned long event, struct netevent_handler_info *info);
  98 };
  99
 100 struct odhcpd_ipaddr {
 101         union if_addr addr;
 102         uint8_t prefix;
 103         uint32_t preferred;
 104         uint32_t valid;
 105
 106         /* ipv6 only */
 107         uint8_t dprefix;
 108
 109         /* ipv4 only */
 110         struct in_addr broadcast;
 111 };
 112
 113 enum odhcpd_mode {
 114         MODE_DISABLED,
 115         MODE_SERVER,
 116         MODE_RELAY,
 117         MODE_HYBRID
 118 };
 119
 120
 121 enum odhcpd_assignment_flags {
 122         OAF_TENTATIVE           = (1 << 0),
 123         OAF_BOUND               = (1 << 1),
 124         OAF_STATIC              = (1 << 2),
 125         OAF_BROKEN_HOSTNAME     = (1 << 3),
 126 };
 127
 128 struct config {
 129         bool legacy;
 130         bool main_dhcpv4;
 131         char *dhcp_cb;
 132         char *dhcp_statefile;
 133         int log_level;
 134 } config;
 135
 136
 137 struct lease {
 138         struct list_head head;
 139         struct in_addr ipaddr;
 140         uint32_t hostid;
 141         struct ether_addr mac;
 142         uint16_t duid_len;
 143         uint8_t *duid;
 144         uint32_t dhcpv4_leasetime;
 145         char hostname[];
 146 };
 147
 148
 149 struct odhcpd_ref_ip;
 150
 151 struct dhcp_assignment {
 152         struct list_head head;
 153         struct interface *iface;
 154
 155         struct sockaddr_in6 peer;
 156         time_t valid_until;
 157
 158 #define fr_timer        reconf_timer
 159         struct uloop_timeout reconf_timer;
 160 #define accept_fr_nonce accept_reconf
 161         bool accept_reconf;
 162 #define fr_cnt          reconf_cnt
 163         int reconf_cnt;
 164         uint8_t key[16];
 165         struct odhcpd_ref_ip *fr_ip;
 166
 167         uint32_t addr;
 168         uint32_t assigned;
 169         uint32_t iaid;
 170         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
 171
 172         struct odhcpd_ipaddr *managed;
 173         ssize_t managed_size;
 174         struct ustream_fd managed_sock;
 175
 176         unsigned int flags;
 177         uint32_t leasetime;
 178         char *hostname;
 179 #define hwaddr          mac
 180         uint8_t mac[6];
 181
 182         uint8_t clid_len;
 183         uint8_t clid_data[];
 184 };
 185
 186
 187 struct interface {
 188         struct avl_node avl;
 189
 190         int ifindex;
 191         char *ifname;
 192         const char *name;
 193
 194         // IPv6 runtime data
 195         struct odhcpd_ipaddr *addr6;
 196         size_t addr6_len;
 197
 198         // RA runtime data
 199         struct uloop_timeout timer_rs;
 200
 201         // DHCPv6 runtime data
 202         struct odhcpd_event dhcpv6_event;
 203         struct list_head ia_assignments;
 204
 205         // NDP runtime data
 206         struct odhcpd_event ndp_event;
 207
 208         // IPv4 runtime data
 209         struct odhcpd_ipaddr *addr4;
 210         size_t addr4_len;
 211
 212         // DHCPv4 runtime data
 213         struct odhcpd_event dhcpv4_event;
 214         struct list_head dhcpv4_assignments;
 215         struct list_head dhcpv4_fr_ips;
 216
 217         // Managed PD
 218         char dhcpv6_pd_manager[128];
 219         struct in6_addr dhcpv6_pd_cer;
 220
 221         // Services
 222         enum odhcpd_mode ra;
 223         enum odhcpd_mode dhcpv6;
 224         enum odhcpd_mode ndp;
 225         enum odhcpd_mode dhcpv4;
 226
 227         // Config
 228         bool inuse;
 229         bool external;
 230         bool master;
 231         bool ignore;
 232         bool always_rewrite_dns;
 233         bool ra_not_onlink;
 234         bool ra_advrouter;
 235         bool ra_useleasetime;
 236         bool ra_dns;
 237         bool no_dynamic_dhcp;
 238         uint8_t pio_filter_length;
 239         struct in6_addr pio_filter_addr;
 240
 241         // RA
 242         int learn_routes;
 243         int default_router;
 244         int ra_managed;
 245         int route_preference;
 246         int ra_maxinterval;
 247         int ra_mininterval;
 248         int ra_lifetime;
 249         uint32_t ra_reachabletime;
 250         uint32_t ra_retranstime;
 251         uint32_t ra_hoplimit;
 252         int ra_mtu;
 253
 254         // DHCPv4
 255         struct in_addr dhcpv4_start;
 256         struct in_addr dhcpv4_end;
 257         struct in_addr dhcpv4_start_ip;
 258         struct in_addr dhcpv4_end_ip;
 259         struct in_addr dhcpv4_local;
 260         struct in_addr dhcpv4_bcast;
 261         struct in_addr dhcpv4_mask;
 262         struct in_addr *dhcpv4_router;
 263         size_t dhcpv4_router_cnt;
 264         struct in_addr *dhcpv4_dns;
 265         size_t dhcpv4_dns_cnt;
 266         uint32_t dhcpv4_leasetime;
 267         bool dhcpv4_forcereconf;
 268
 269         // DNS
 270         struct in6_addr *dns;
 271         size_t dns_cnt;
 272         uint8_t *search;
 273         size_t search_len;
 274
 275         // DHCPV6
 276         void *dhcpv6_raw;
 277         size_t dhcpv6_raw_len;
 278         bool dhcpv6_assignall;
 279         bool dhcpv6_pd;
 280         bool dhcpv6_na;
 281
 282         char *upstream;
 283         size_t upstream_len;
 284
 285         char *filter_class;
 286 };
 287
 288 extern struct avl_tree interfaces;
 289
 290 #define RA_MANAGED_NO_MFLAG     0
 291 #define RA_MANAGED_MFLAG        1
 292 #define RA_MANAGED_NO_AFLAG     2
 293
 294
 295 // Exported main functions
 296 int odhcpd_register(struct odhcpd_event *event);
 297 int odhcpd_deregister(struct odhcpd_event *event);
 298 void odhcpd_process(struct odhcpd_event *event);
 299
 300 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 301                 struct iovec *iov, size_t iov_len,
 302                 const struct interface *iface);
 303 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 304                 struct in6_addr *addr);
 305 int odhcpd_get_interface_config(const char *ifname, const char *what);
 306 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 307 struct interface* odhcpd_get_interface_by_index(int ifindex);
 308 struct interface* odhcpd_get_master_interface(void);
 309 int odhcpd_urandom(void *data, size_t len);
 310
 311 void odhcpd_run(void);
 312 time_t odhcpd_time(void);
 313 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 314 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 315 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
 316
 317 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 318 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 319
 320 int odhcpd_netmask2bitlen(bool v6, void *mask);
 321 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
 322 bool odhcpd_valid_hostname(const char *name);
 323
 324 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 325
 326 #ifdef WITH_UBUS
 327 int ubus_init(void);
 328 const char* ubus_get_ifname(const char *name);
 329 void ubus_apply_network(void);
 330 bool ubus_has_prefix(const char *name, const char *ifname);
 331 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
 332                 const struct in_addr *addr, const char *name, const char *interface);
 333 #endif
 334
 335 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
 336 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
 337                 struct odhcpd_ipaddr **addrs);
 338 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
 339                 const int ifindex, const struct in6_addr *gw,
 340                 const uint32_t metric, const bool add);
 341 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
 342                 const int ifindex, const bool add);
 343 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
 344                 const int ifindex, const bool v6, const bool add);
 345 void netlink_dump_neigh_table(const bool proxy);
 346 void netlink_dump_addr_table(const bool v6);
 347
 348 // Exported module initializers
 349 int netlink_init(void);
 350 int router_init(void);
 351 int dhcpv6_init(void);
 352 int ndp_init(void);
 353 #ifdef DHCPV4_SUPPORT
 354 int dhcpv4_init(void);
 355
 356 int dhcpv4_setup_interface(struct interface *iface, bool enable);
 357 #endif
 358 int router_setup_interface(struct interface *iface, bool enable);
 359 int dhcpv6_setup_interface(struct interface *iface, bool enable);
 360 int ndp_setup_interface(struct interface *iface, bool enable);
 361
 362 void odhcpd_reload(void);