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
  24 #ifndef typeof
  25 #define typeof __typeof
  26 #endif
  27
  28 #ifndef container_of
  29 #define container_of(ptr, type, member) (           \
  30     (type *)( (char *)ptr - offsetof(type,member) ))
  31 #endif
  32
  33 #include <libubox/list.h>
  34 #include <libubox/uloop.h>
  35
  36 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  37
  38 // RFC 6106 defines this router advertisement option
  39 #define ND_OPT_ROUTE_INFO 24
  40 #define ND_OPT_RECURSIVE_DNS 25
  41 #define ND_OPT_DNS_SEARCH 31
  42
  43 #define INFINITE_VALID(x) ((x) == 0)
  44
  45 #define _unused __attribute__((unused))
  46 #define _packed __attribute__((packed))
  47
  48 #define ALL_IPV6_NODES "ff02::1"
  49 #define ALL_IPV6_ROUTERS "ff02::2"
  50
  51 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
  52
  53 struct interface;
  54 struct nl_sock;
  55 extern struct list_head leases;
  56
  57 struct odhcpd_event {
  58         struct uloop_fd uloop;
  59         void (*handle_dgram)(void *addr, void *data, size_t len,
  60                         struct interface *iface, void *dest_addr);
  61         void (*handle_error)(struct odhcpd_event *e, int error);
  62         void (*recv_msgs)(struct odhcpd_event *e);
  63 };
  64
  65 union if_addr {
  66         struct in_addr in;
  67         struct in6_addr in6;
  68 };
  69
  70 struct netevent_handler_info {
  71         struct interface *iface;
  72         union {
  73                 struct {
  74                         union if_addr dst;
  75                         uint8_t dst_len;
  76                         union if_addr gateway;
  77                 } rt;
  78                 struct {
  79                         union if_addr dst;
  80                         uint16_t state;
  81                         uint8_t flags;
  82                 } neigh;
  83                 struct {
  84                         struct odhcpd_ipaddr *addrs;
  85                         size_t len;
  86                 } addrs_old;
  87                 union if_addr addr;
  88         };
  89 };
  90
  91 enum netevents {
  92         NETEV_IFINDEX_CHANGE,
  93         NETEV_ADDR_ADD,
  94         NETEV_ADDR_DEL,
  95         NETEV_ADDRLIST_CHANGE,
  96         NETEV_ADDR6_ADD,
  97         NETEV_ADDR6_DEL,
  98         NETEV_ADDR6LIST_CHANGE,
  99         NETEV_ROUTE6_ADD,
 100         NETEV_ROUTE6_DEL,
 101         NETEV_NEIGH6_ADD,
 102         NETEV_NEIGH6_DEL,
 103 };
 104
 105 struct netevent_handler {
 106         struct list_head head;
 107         void (*cb) (unsigned long event, struct netevent_handler_info *info);
 108 };
 109
 110 struct odhcpd_ipaddr {
 111         union if_addr addr;
 112         uint8_t prefix;
 113         uint32_t preferred;
 114         uint32_t valid;
 115
 116         /* ipv6 only */
 117         uint8_t dprefix;
 118
 119         /* ipv4 only */
 120         struct in_addr broadcast;
 121 };
 122
 123 enum odhcpd_mode {
 124         MODE_DISABLED,
 125         MODE_SERVER,
 126         MODE_RELAY,
 127         MODE_HYBRID
 128 };
 129
 130
 131 enum odhcpd_assignment_flags {
 132         OAF_TENTATIVE   = (1 << 0),
 133         OAF_BOUND       = (1 << 1),
 134         OAF_STATIC      = (1 << 2),
 135 };
 136
 137 struct config {
 138         bool legacy;
 139         bool main_dhcpv4;
 140         char *dhcp_cb;
 141         char *dhcp_statefile;
 142         int log_level;
 143 } config;
 144
 145
 146 struct lease {
 147         struct list_head head;
 148         struct in_addr ipaddr;
 149         uint32_t hostid;
 150         struct ether_addr mac;
 151         uint16_t duid_len;
 152         uint8_t *duid;
 153         uint32_t dhcpv4_leasetime;
 154         char hostname[];
 155 };
 156
 157
 158 struct interface {
 159         struct list_head head;
 160
 161         int ifindex;
 162         char *ifname;
 163         const char *name;
 164
 165         // IPv6 runtime data
 166         struct odhcpd_ipaddr *addr6;
 167         size_t addr6_len;
 168
 169         // RA runtime data
 170         struct uloop_timeout timer_rs;
 171
 172         // DHCPv6 runtime data
 173         struct odhcpd_event dhcpv6_event;
 174         struct list_head ia_assignments;
 175
 176         // NDP runtime data
 177         struct odhcpd_event ndp_event;
 178
 179         // IPv4 runtime data
 180         struct odhcpd_ipaddr *addr4;
 181         size_t addr4_len;
 182
 183         // DHCPv4 runtime data
 184         struct odhcpd_event dhcpv4_event;
 185         struct list_head dhcpv4_assignments;
 186         struct list_head dhcpv4_fr_ips;
 187
 188         // Managed PD
 189         char dhcpv6_pd_manager[128];
 190         struct in6_addr dhcpv6_pd_cer;
 191
 192         // Services
 193         enum odhcpd_mode ra;
 194         enum odhcpd_mode dhcpv6;
 195         enum odhcpd_mode ndp;
 196         enum odhcpd_mode dhcpv4;
 197
 198         // Config
 199         bool inuse;
 200         bool external;
 201         bool master;
 202         bool ignore;
 203         bool always_rewrite_dns;
 204         bool ra_not_onlink;
 205         bool ra_advrouter;
 206         bool ra_useleasetime;
 207         bool no_dynamic_dhcp;
 208         uint8_t pio_filter_length;
 209         struct in6_addr pio_filter_addr;
 210
 211         // RA
 212         int learn_routes;
 213         int default_router;
 214         int ra_managed;
 215         int route_preference;
 216         int ra_maxinterval;
 217         int ra_mininterval;
 218         int ra_lifetime;
 219         uint32_t ra_reachabletime;
 220         uint32_t ra_retranstime;
 221         uint32_t ra_hoplimit;
 222         int ra_mtu;
 223
 224         // DHCPv4
 225         struct in_addr dhcpv4_start;
 226         struct in_addr dhcpv4_end;
 227         struct in_addr dhcpv4_start_ip;
 228         struct in_addr dhcpv4_end_ip;
 229         struct in_addr dhcpv4_local;
 230         struct in_addr dhcpv4_bcast;
 231         struct in_addr dhcpv4_mask;
 232         struct in_addr *dhcpv4_router;
 233         size_t dhcpv4_router_cnt;
 234         struct in_addr *dhcpv4_dns;
 235         size_t dhcpv4_dns_cnt;
 236         uint32_t dhcpv4_leasetime;
 237         bool dhcpv4_forcereconf;
 238
 239         // DNS
 240         struct in6_addr *dns;
 241         size_t dns_cnt;
 242         uint8_t *search;
 243         size_t search_len;
 244
 245         // DHCPV6
 246         void *dhcpv6_raw;
 247         size_t dhcpv6_raw_len;
 248         bool dhcpv6_assignall;
 249
 250         char *upstream;
 251         size_t upstream_len;
 252
 253         char *filter_class;
 254 };
 255
 256 extern struct list_head interfaces;
 257
 258 #define RA_MANAGED_NO_MFLAG     0
 259 #define RA_MANAGED_MFLAG        1
 260 #define RA_MANAGED_NO_AFLAG     2
 261
 262
 263 // Exported main functions
 264 int odhcpd_register(struct odhcpd_event *event);
 265 int odhcpd_deregister(struct odhcpd_event *event);
 266 void odhcpd_process(struct odhcpd_event *event);
 267
 268 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 269                 struct iovec *iov, size_t iov_len,
 270                 const struct interface *iface);
 271 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 272                 struct in6_addr *addr);
 273 struct interface* odhcpd_get_interface_by_name(const char *name);
 274 int odhcpd_get_interface_config(const char *ifname, const char *what);
 275 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 276 struct interface* odhcpd_get_interface_by_index(int ifindex);
 277 struct interface* odhcpd_get_master_interface(void);
 278 int odhcpd_urandom(void *data, size_t len);
 279
 280 void odhcpd_run(void);
 281 time_t odhcpd_time(void);
 282 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 283 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 284 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
 285
 286 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 287 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 288
 289 int odhcpd_netmask2bitlen(bool v6, void *mask);
 290 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
 291
 292 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 293
 294 #ifdef WITH_UBUS
 295 int ubus_init(void);
 296 const char* ubus_get_ifname(const char *name);
 297 void ubus_apply_network(void);
 298 bool ubus_has_prefix(const char *name, const char *ifname);
 299 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
 300                 const struct in_addr *addr, const char *name, const char *interface);
 301 #endif
 302
 303 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
 304 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
 305                 struct odhcpd_ipaddr **addrs);
 306 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
 307                 const int ifindex, const struct in6_addr *gw,
 308                 const uint32_t metric, const bool add);
 309 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
 310                 const int ifindex, const bool add);
 311 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
 312                 const int ifindex, const bool v6, const bool add);
 313 void netlink_dump_neigh_table(const bool proxy);
 314 void netlink_dump_addr_table(const bool v6);
 315
 316 // Exported module initializers
 317 int netlink_init(void);
 318 int router_init(void);
 319 int dhcpv6_init(void);
 320 int ndp_init(void);
 321 #ifdef DHCPV4_SUPPORT
 322 int dhcpv4_init(void);
 323
 324 int dhcpv4_setup_interface(struct interface *iface, bool enable);
 325 #endif
 326 int router_setup_interface(struct interface *iface, bool enable);
 327 int dhcpv6_setup_interface(struct interface *iface, bool enable);
 328 int ndp_setup_interface(struct interface *iface, bool enable);
 329
 330 void odhcpd_reload(void);