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 typedef void (*dhcpv6_binding_cb_handler_t)(struct in6_addr *addr, int prefix,
  56                                             uint32_t pref, uint32_t valid,
  57                                             void *arg);
  58
  59 union if_addr {
  60         struct in_addr in;
  61         struct in6_addr in6;
  62 };
  63
  64 struct netevent_handler_info {
  65         struct interface *iface;
  66         union {
  67                 struct {
  68                         union if_addr dst;
  69                         uint8_t dst_len;
  70                         union if_addr gateway;
  71                 } rt;
  72                 struct {
  73                         union if_addr dst;
  74                         uint16_t state;
  75                         uint8_t flags;
  76                 } neigh;
  77                 struct {
  78                         struct odhcpd_ipaddr *addrs;
  79                         size_t len;
  80                 } addrs_old;
  81                 union if_addr addr;
  82         };
  83 };
  84
  85 enum netevents {
  86         NETEV_IFINDEX_CHANGE,
  87         NETEV_ADDR_ADD,
  88         NETEV_ADDR_DEL,
  89         NETEV_ADDRLIST_CHANGE,
  90         NETEV_ADDR6_ADD,
  91         NETEV_ADDR6_DEL,
  92         NETEV_ADDR6LIST_CHANGE,
  93         NETEV_ROUTE6_ADD,
  94         NETEV_ROUTE6_DEL,
  95         NETEV_NEIGH6_ADD,
  96         NETEV_NEIGH6_DEL,
  97 };
  98
  99 struct netevent_handler {
 100         struct list_head head;
 101         void (*cb) (unsigned long event, struct netevent_handler_info *info);
 102 };
 103
 104 struct odhcpd_ipaddr {
 105         union if_addr addr;
 106         uint8_t prefix;
 107         uint32_t preferred;
 108         uint32_t valid;
 109
 110         /* ipv6 only */
 111         uint8_t dprefix;
 112
 113         /* ipv4 only */
 114         struct in_addr broadcast;
 115 };
 116
 117 enum odhcpd_mode {
 118         MODE_DISABLED,
 119         MODE_SERVER,
 120         MODE_RELAY,
 121         MODE_HYBRID
 122 };
 123
 124
 125 enum odhcpd_assignment_flags {
 126         OAF_TENTATIVE           = (1 << 0),
 127         OAF_BOUND               = (1 << 1),
 128         OAF_STATIC              = (1 << 2),
 129         OAF_BROKEN_HOSTNAME     = (1 << 3),
 130 };
 131
 132 struct config {
 133         bool legacy;
 134         bool main_dhcpv4;
 135         char *dhcp_cb;
 136         char *dhcp_statefile;
 137         int log_level;
 138 } config;
 139
 140
 141 struct lease {
 142         struct list_head head;
 143         struct in_addr ipaddr;
 144         uint32_t hostid;
 145         struct ether_addr mac;
 146         uint16_t duid_len;
 147         uint8_t *duid;
 148         uint32_t dhcpv4_leasetime;
 149         char hostname[];
 150 };
 151
 152
 153 struct odhcpd_ref_ip;
 154
 155 struct dhcp_assignment {
 156         struct list_head head;
 157         struct interface *iface;
 158
 159         struct sockaddr_in6 peer;
 160         time_t valid_until;
 161
 162 #define fr_timer        reconf_timer
 163         struct uloop_timeout reconf_timer;
 164 #define accept_fr_nonce accept_reconf
 165         bool accept_reconf;
 166 #define fr_cnt          reconf_cnt
 167         int reconf_cnt;
 168         uint8_t key[16];
 169         struct odhcpd_ref_ip *fr_ip;
 170
 171         uint32_t addr;
 172         uint32_t assigned;
 173         uint32_t iaid;
 174         uint8_t length; // length == 128 -> IA_NA, length <= 64 -> IA_PD
 175
 176         struct odhcpd_ipaddr *managed;
 177         ssize_t managed_size;
 178         struct ustream_fd managed_sock;
 179
 180         unsigned int flags;
 181         uint32_t leasetime;
 182         char *hostname;
 183 #define hwaddr          mac
 184         uint8_t mac[6];
 185
 186         uint8_t clid_len;
 187         uint8_t clid_data[];
 188 };
 189
 190
 191 struct interface {
 192         struct avl_node avl;
 193
 194         int ifindex;
 195         char *ifname;
 196         const char *name;
 197
 198         // IPv6 runtime data
 199         struct odhcpd_ipaddr *addr6;
 200         size_t addr6_len;
 201
 202         // RA runtime data
 203         struct uloop_timeout timer_rs;
 204
 205         // DHCPv6 runtime data
 206         struct odhcpd_event dhcpv6_event;
 207         struct list_head ia_assignments;
 208
 209         // NDP runtime data
 210         struct odhcpd_event ndp_event;
 211
 212         // IPv4 runtime data
 213         struct odhcpd_ipaddr *addr4;
 214         size_t addr4_len;
 215
 216         // DHCPv4 runtime data
 217         struct odhcpd_event dhcpv4_event;
 218         struct list_head dhcpv4_assignments;
 219         struct list_head dhcpv4_fr_ips;
 220
 221         // Managed PD
 222         char dhcpv6_pd_manager[128];
 223         struct in6_addr dhcpv6_pd_cer;
 224
 225         // Services
 226         enum odhcpd_mode ra;
 227         enum odhcpd_mode dhcpv6;
 228         enum odhcpd_mode ndp;
 229         enum odhcpd_mode dhcpv4;
 230
 231         // Config
 232         bool inuse;
 233         bool external;
 234         bool master;
 235         bool ignore;
 236         bool always_rewrite_dns;
 237         bool ra_not_onlink;
 238         bool ra_advrouter;
 239         bool ra_useleasetime;
 240         bool ra_dns;
 241         bool no_dynamic_dhcp;
 242         uint8_t pio_filter_length;
 243         struct in6_addr pio_filter_addr;
 244
 245         // RA
 246         int learn_routes;
 247         int default_router;
 248         int ra_managed;
 249         int route_preference;
 250         int ra_maxinterval;
 251         int ra_mininterval;
 252         int ra_lifetime;
 253         uint32_t ra_reachabletime;
 254         uint32_t ra_retranstime;
 255         uint32_t ra_hoplimit;
 256         int ra_mtu;
 257
 258         // DHCPv4
 259         struct in_addr dhcpv4_start;
 260         struct in_addr dhcpv4_end;
 261         struct in_addr dhcpv4_start_ip;
 262         struct in_addr dhcpv4_end_ip;
 263         struct in_addr dhcpv4_local;
 264         struct in_addr dhcpv4_bcast;
 265         struct in_addr dhcpv4_mask;
 266         struct in_addr *dhcpv4_router;
 267         size_t dhcpv4_router_cnt;
 268         struct in_addr *dhcpv4_dns;
 269         size_t dhcpv4_dns_cnt;
 270         uint32_t dhcpv4_leasetime;
 271         bool dhcpv4_forcereconf;
 272
 273         // DNS
 274         struct in6_addr *dns;
 275         size_t dns_cnt;
 276         uint8_t *search;
 277         size_t search_len;
 278
 279         // DHCPV6
 280         void *dhcpv6_raw;
 281         size_t dhcpv6_raw_len;
 282         bool dhcpv6_assignall;
 283         bool dhcpv6_pd;
 284         bool dhcpv6_na;
 285
 286         char *upstream;
 287         size_t upstream_len;
 288
 289         char *filter_class;
 290 };
 291
 292 extern struct avl_tree interfaces;
 293
 294 #define RA_MANAGED_NO_MFLAG     0
 295 #define RA_MANAGED_MFLAG        1
 296 #define RA_MANAGED_NO_AFLAG     2
 297
 298
 299 // Exported main functions
 300 int odhcpd_register(struct odhcpd_event *event);
 301 int odhcpd_deregister(struct odhcpd_event *event);
 302 void odhcpd_process(struct odhcpd_event *event);
 303
 304 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 305                 struct iovec *iov, size_t iov_len,
 306                 const struct interface *iface);
 307 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 308                 struct in6_addr *addr);
 309 int odhcpd_get_interface_config(const char *ifname, const char *what);
 310 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 311 struct interface* odhcpd_get_interface_by_index(int ifindex);
 312 struct interface* odhcpd_get_master_interface(void);
 313 int odhcpd_urandom(void *data, size_t len);
 314
 315 void odhcpd_run(void);
 316 time_t odhcpd_time(void);
 317 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 318 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 319 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
 320
 321 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 322 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 323
 324 int odhcpd_netmask2bitlen(bool v6, void *mask);
 325 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
 326 bool odhcpd_valid_hostname(const char *name);
 327
 328 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 329
 330 #ifdef WITH_UBUS
 331 int ubus_init(void);
 332 const char* ubus_get_ifname(const char *name);
 333 void ubus_apply_network(void);
 334 bool ubus_has_prefix(const char *name, const char *ifname);
 335 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
 336                 const struct in_addr *addr, const char *name, const char *interface);
 337 #endif
 338
 339 ssize_t dhcpv6_ia_handle_IAs(uint8_t *buf, size_t buflen, struct interface *iface,
 340                 const struct sockaddr_in6 *addr, const void *data, const uint8_t *end);
 341 int dhcpv6_ia_init(void);
 342 int dhcpv6_ia_setup_interface(struct interface *iface, bool enable);
 343 void dhcpv6_ia_enum_addrs(struct interface *iface, struct dhcp_assignment *c, time_t now,
 344                                 dhcpv6_binding_cb_handler_t func, void *arg);
 345 void dhcpv6_ia_write_statefile(void);
 346
 347 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
 348 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
 349                 struct odhcpd_ipaddr **addrs);
 350 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
 351                 const int ifindex, const struct in6_addr *gw,
 352                 const uint32_t metric, const bool add);
 353 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
 354                 const int ifindex, const bool add);
 355 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
 356                 const int ifindex, const bool v6, const bool add);
 357 void netlink_dump_neigh_table(const bool proxy);
 358 void netlink_dump_addr_table(const bool v6);
 359
 360 // Exported module initializers
 361 int netlink_init(void);
 362 int router_init(void);
 363 int dhcpv6_init(void);
 364 int ndp_init(void);
 365 #ifdef DHCPV4_SUPPORT
 366 int dhcpv4_init(void);
 367
 368 int dhcpv4_setup_interface(struct interface *iface, bool enable);
 369 #endif
 370 int router_setup_interface(struct interface *iface, bool enable);
 371 int dhcpv6_setup_interface(struct interface *iface, bool enable);
 372 int ndp_setup_interface(struct interface *iface, bool enable);
 373
 374 void odhcpd_reload(void);