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
  49 #define ALL_IPV6_NODES {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  50                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}}}
  51
  52 #define ALL_IPV6_ROUTERS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  53                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}}}
  54
  55 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
  56
  57 struct interface;
  58 struct nl_sock;
  59 extern struct list_head leases;
  60
  61 struct odhcpd_event {
  62         struct uloop_fd uloop;
  63         void (*handle_dgram)(void *addr, void *data, size_t len,
  64                         struct interface *iface, void *dest_addr);
  65         void (*handle_error)(struct odhcpd_event *e, int error);
  66         void (*recv_msgs)(struct odhcpd_event *e);
  67 };
  68
  69 union if_addr {
  70         struct in_addr in;
  71         struct in6_addr in6;
  72 };
  73
  74 struct netevent_handler_info {
  75         struct interface *iface;
  76         union {
  77                 struct {
  78                         union if_addr dst;
  79                         uint8_t dst_len;
  80                         union if_addr gateway;
  81                 } rt;
  82                 struct {
  83                         union if_addr dst;
  84                         uint16_t state;
  85                         uint8_t flags;
  86                 } neigh;
  87                 struct {
  88                         struct odhcpd_ipaddr *addrs;
  89                         size_t len;
  90                 } addrs_old;
  91                 union if_addr addr;
  92         };
  93 };
  94
  95 enum netevents {
  96         NETEV_IFINDEX_CHANGE,
  97         NETEV_ADDR_ADD,
  98         NETEV_ADDR_DEL,
  99         NETEV_ADDRLIST_CHANGE,
 100         NETEV_ADDR6_ADD,
 101         NETEV_ADDR6_DEL,
 102         NETEV_ADDR6LIST_CHANGE,
 103         NETEV_ROUTE6_ADD,
 104         NETEV_ROUTE6_DEL,
 105         NETEV_NEIGH6_ADD,
 106         NETEV_NEIGH6_DEL,
 107 };
 108
 109 struct netevent_handler {
 110         struct list_head head;
 111         void (*cb) (unsigned long event, struct netevent_handler_info *info);
 112 };
 113
 114 struct odhcpd_ipaddr {
 115         union if_addr addr;
 116         uint8_t prefix;
 117         uint32_t preferred;
 118         uint32_t valid;
 119
 120         /* ipv6 only */
 121         uint8_t dprefix;
 122
 123         /* ipv4 only */
 124         struct in_addr broadcast;
 125 };
 126
 127 enum odhcpd_mode {
 128         MODE_DISABLED,
 129         MODE_SERVER,
 130         MODE_RELAY,
 131         MODE_HYBRID
 132 };
 133
 134
 135 enum odhcpd_assignment_flags {
 136         OAF_TENTATIVE   = (1 << 0),
 137         OAF_BOUND       = (1 << 1),
 138         OAF_STATIC      = (1 << 2),
 139 };
 140
 141 struct config {
 142         bool legacy;
 143         bool main_dhcpv4;
 144         char *dhcp_cb;
 145         char *dhcp_statefile;
 146         int log_level;
 147 } config;
 148
 149
 150 struct lease {
 151         struct list_head head;
 152         struct in_addr ipaddr;
 153         uint32_t hostid;
 154         struct ether_addr mac;
 155         uint16_t duid_len;
 156         uint8_t *duid;
 157         uint32_t dhcpv4_leasetime;
 158         char hostname[];
 159 };
 160
 161
 162 struct interface {
 163         struct list_head head;
 164
 165         int ifindex;
 166         char *ifname;
 167         const char *name;
 168
 169         // IPv6 runtime data
 170         struct odhcpd_ipaddr *addr6;
 171         size_t addr6_len;
 172
 173         // RA runtime data
 174         struct uloop_timeout timer_rs;
 175
 176         // DHCPv6 runtime data
 177         struct odhcpd_event dhcpv6_event;
 178         struct list_head ia_assignments;
 179
 180         // NDP runtime data
 181         struct odhcpd_event ndp_event;
 182
 183         // IPv4 runtime data
 184         struct odhcpd_ipaddr *addr4;
 185         size_t addr4_len;
 186
 187         // DHCPv4 runtime data
 188         struct odhcpd_event dhcpv4_event;
 189         struct list_head dhcpv4_assignments;
 190         struct list_head dhcpv4_fr_ips;
 191
 192         // Managed PD
 193         char dhcpv6_pd_manager[128];
 194         struct in6_addr dhcpv6_pd_cer;
 195
 196         // Services
 197         enum odhcpd_mode ra;
 198         enum odhcpd_mode dhcpv6;
 199         enum odhcpd_mode ndp;
 200         enum odhcpd_mode dhcpv4;
 201
 202         // Config
 203         bool inuse;
 204         bool external;
 205         bool master;
 206         bool ignore;
 207         bool always_rewrite_dns;
 208         bool ra_not_onlink;
 209         bool ra_advrouter;
 210         bool ra_useleasetime;
 211         bool no_dynamic_dhcp;
 212         uint8_t pio_filter_length;
 213         struct in6_addr pio_filter_addr;
 214
 215         // RA
 216         int learn_routes;
 217         int default_router;
 218         int ra_managed;
 219         int route_preference;
 220         int ra_maxinterval;
 221         int ra_mininterval;
 222         int ra_lifetime;
 223         uint32_t ra_reachabletime;
 224         uint32_t ra_retranstime;
 225         uint32_t ra_hoplimit;
 226         int ra_mtu;
 227
 228         // DHCPv4
 229         struct in_addr dhcpv4_start;
 230         struct in_addr dhcpv4_end;
 231         struct in_addr dhcpv4_start_ip;
 232         struct in_addr dhcpv4_end_ip;
 233         struct in_addr dhcpv4_local;
 234         struct in_addr dhcpv4_bcast;
 235         struct in_addr dhcpv4_mask;
 236         struct in_addr *dhcpv4_router;
 237         size_t dhcpv4_router_cnt;
 238         struct in_addr *dhcpv4_dns;
 239         size_t dhcpv4_dns_cnt;
 240         uint32_t dhcpv4_leasetime;
 241         bool dhcpv4_forcereconf;
 242
 243         // DNS
 244         struct in6_addr *dns;
 245         size_t dns_cnt;
 246         uint8_t *search;
 247         size_t search_len;
 248
 249         // DHCPV6
 250         void *dhcpv6_raw;
 251         size_t dhcpv6_raw_len;
 252         bool dhcpv6_assignall;
 253
 254         char *upstream;
 255         size_t upstream_len;
 256
 257         char *filter_class;
 258 };
 259
 260 extern struct list_head interfaces;
 261
 262 #define RA_MANAGED_NO_MFLAG     0
 263 #define RA_MANAGED_MFLAG        1
 264 #define RA_MANAGED_NO_AFLAG     2
 265
 266
 267 // Exported main functions
 268 int odhcpd_register(struct odhcpd_event *event);
 269 int odhcpd_deregister(struct odhcpd_event *event);
 270 void odhcpd_process(struct odhcpd_event *event);
 271
 272 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 273                 struct iovec *iov, size_t iov_len,
 274                 const struct interface *iface);
 275 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 276                 struct in6_addr *addr);
 277 struct interface* odhcpd_get_interface_by_name(const char *name);
 278 int odhcpd_get_interface_config(const char *ifname, const char *what);
 279 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 280 struct interface* odhcpd_get_interface_by_index(int ifindex);
 281 struct interface* odhcpd_get_master_interface(void);
 282 int odhcpd_urandom(void *data, size_t len);
 283
 284 void odhcpd_run(void);
 285 time_t odhcpd_time(void);
 286 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 287 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 288 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
 289
 290 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 291 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 292
 293 int odhcpd_netmask2bitlen(bool v6, void *mask);
 294 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
 295
 296 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 297
 298 #ifdef WITH_UBUS
 299 int ubus_init(void);
 300 const char* ubus_get_ifname(const char *name);
 301 void ubus_apply_network(void);
 302 bool ubus_has_prefix(const char *name, const char *ifname);
 303 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
 304                 const struct in_addr *addr, const char *name, const char *interface);
 305 #endif
 306
 307 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
 308 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
 309                 struct odhcpd_ipaddr **addrs);
 310 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
 311                 const int ifindex, const struct in6_addr *gw,
 312                 const uint32_t metric, const bool add);
 313 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
 314                 const int ifindex, const bool add);
 315 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
 316                 const int ifindex, const bool v6, const bool add);
 317 void netlink_dump_neigh_table(const bool proxy);
 318 void netlink_dump_addr_table(const bool v6);
 319
 320 // Exported module initializers
 321 int netlink_init(void);
 322 int router_init(void);
 323 int dhcpv6_init(void);
 324 int ndp_init(void);
 325 #ifdef DHCPV4_SUPPORT
 326 int dhcpv4_init(void);
 327
 328 int dhcpv4_setup_interface(struct interface *iface, bool enable);
 329 #endif
 330 int router_setup_interface(struct interface *iface, bool enable);
 331 int dhcpv6_setup_interface(struct interface *iface, bool enable);
 332 int ndp_setup_interface(struct interface *iface, bool enable);
 333
 334 void odhcpd_reload(void);