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
  26 // RFC 6106 defines this router advertisement option
  27 #define ND_OPT_ROUTE_INFO 24
  28 #define ND_OPT_RECURSIVE_DNS 25
  29 #define ND_OPT_DNS_SEARCH 31
  30
  31 #define INFINITE_VALID(x) ((x) == 0)
  32
  33 #define _unused __attribute__((unused))
  34 #define _packed __attribute__((packed))
  35
  36 #define ALL_IPV6_NODES "ff02::1"
  37 #define ALL_IPV6_ROUTERS "ff02::2"
  38
  39 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
  40
  41 struct interface;
  42 struct nl_sock;
  43 extern struct list_head leases;
  44
  45 struct odhcpd_event {
  46         struct uloop_fd uloop;
  47         void (*handle_dgram)(void *addr, void *data, size_t len,
  48                         struct interface *iface, void *dest_addr);
  49         void (*handle_error)(struct odhcpd_event *e, int error);
  50         void (*recv_msgs)(struct odhcpd_event *e);
  51 };
  52
  53 union if_addr {
  54         struct in_addr in;
  55         struct in6_addr in6;
  56 };
  57
  58 struct netevent_handler_info {
  59         struct interface *iface;
  60         union {
  61                 struct {
  62                         union if_addr dst;
  63                         uint8_t dst_len;
  64                         union if_addr gateway;
  65                 } rt;
  66                 struct {
  67                         union if_addr dst;
  68                         uint16_t state;
  69                         uint8_t flags;
  70                 } neigh;
  71                 struct {
  72                         struct odhcpd_ipaddr *addrs;
  73                         size_t len;
  74                 } addrs_old;
  75                 union if_addr addr;
  76         };
  77 };
  78
  79 enum netevents {
  80         NETEV_IFINDEX_CHANGE,
  81         NETEV_ADDR_ADD,
  82         NETEV_ADDR_DEL,
  83         NETEV_ADDRLIST_CHANGE,
  84         NETEV_ADDR6_ADD,
  85         NETEV_ADDR6_DEL,
  86         NETEV_ADDR6LIST_CHANGE,
  87         NETEV_ROUTE6_ADD,
  88         NETEV_ROUTE6_DEL,
  89         NETEV_NEIGH6_ADD,
  90         NETEV_NEIGH6_DEL,
  91 };
  92
  93 struct netevent_handler {
  94         struct list_head head;
  95         void (*cb) (unsigned long event, struct netevent_handler_info *info);
  96 };
  97
  98 struct odhcpd_ipaddr {
  99         union if_addr addr;
 100         uint8_t prefix;
 101         uint32_t preferred;
 102         uint32_t valid;
 103
 104         /* ipv6 only */
 105         uint8_t dprefix;
 106
 107         /* ipv4 only */
 108         struct in_addr broadcast;
 109 };
 110
 111 enum odhcpd_mode {
 112         MODE_DISABLED,
 113         MODE_SERVER,
 114         MODE_RELAY,
 115         MODE_HYBRID
 116 };
 117
 118
 119 enum odhcpd_assignment_flags {
 120         OAF_TENTATIVE           = (1 << 0),
 121         OAF_BOUND               = (1 << 1),
 122         OAF_STATIC              = (1 << 2),
 123         OAF_BROKEN_HOSTNAME     = (1 << 3),
 124 };
 125
 126 struct config {
 127         bool legacy;
 128         bool main_dhcpv4;
 129         char *dhcp_cb;
 130         char *dhcp_statefile;
 131         int log_level;
 132 } config;
 133
 134
 135 struct lease {
 136         struct list_head head;
 137         struct in_addr ipaddr;
 138         uint32_t hostid;
 139         struct ether_addr mac;
 140         uint16_t duid_len;
 141         uint8_t *duid;
 142         uint32_t dhcpv4_leasetime;
 143         char hostname[];
 144 };
 145
 146
 147 struct interface {
 148         struct list_head head;
 149
 150         int ifindex;
 151         char *ifname;
 152         const char *name;
 153
 154         // IPv6 runtime data
 155         struct odhcpd_ipaddr *addr6;
 156         size_t addr6_len;
 157
 158         // RA runtime data
 159         struct uloop_timeout timer_rs;
 160
 161         // DHCPv6 runtime data
 162         struct odhcpd_event dhcpv6_event;
 163         struct list_head ia_assignments;
 164
 165         // NDP runtime data
 166         struct odhcpd_event ndp_event;
 167
 168         // IPv4 runtime data
 169         struct odhcpd_ipaddr *addr4;
 170         size_t addr4_len;
 171
 172         // DHCPv4 runtime data
 173         struct odhcpd_event dhcpv4_event;
 174         struct list_head dhcpv4_assignments;
 175         struct list_head dhcpv4_fr_ips;
 176
 177         // Managed PD
 178         char dhcpv6_pd_manager[128];
 179         struct in6_addr dhcpv6_pd_cer;
 180
 181         // Services
 182         enum odhcpd_mode ra;
 183         enum odhcpd_mode dhcpv6;
 184         enum odhcpd_mode ndp;
 185         enum odhcpd_mode dhcpv4;
 186
 187         // Config
 188         bool inuse;
 189         bool external;
 190         bool master;
 191         bool ignore;
 192         bool always_rewrite_dns;
 193         bool ra_not_onlink;
 194         bool ra_advrouter;
 195         bool ra_useleasetime;
 196         bool no_dynamic_dhcp;
 197         uint8_t pio_filter_length;
 198         struct in6_addr pio_filter_addr;
 199
 200         // RA
 201         int learn_routes;
 202         int default_router;
 203         int ra_managed;
 204         int route_preference;
 205         int ra_maxinterval;
 206         int ra_mininterval;
 207         int ra_lifetime;
 208         uint32_t ra_reachabletime;
 209         uint32_t ra_retranstime;
 210         uint32_t ra_hoplimit;
 211         int ra_mtu;
 212
 213         // DHCPv4
 214         struct in_addr dhcpv4_start;
 215         struct in_addr dhcpv4_end;
 216         struct in_addr dhcpv4_start_ip;
 217         struct in_addr dhcpv4_end_ip;
 218         struct in_addr dhcpv4_local;
 219         struct in_addr dhcpv4_bcast;
 220         struct in_addr dhcpv4_mask;
 221         struct in_addr *dhcpv4_router;
 222         size_t dhcpv4_router_cnt;
 223         struct in_addr *dhcpv4_dns;
 224         size_t dhcpv4_dns_cnt;
 225         uint32_t dhcpv4_leasetime;
 226         bool dhcpv4_forcereconf;
 227
 228         // DNS
 229         struct in6_addr *dns;
 230         size_t dns_cnt;
 231         uint8_t *search;
 232         size_t search_len;
 233
 234         // DHCPV6
 235         void *dhcpv6_raw;
 236         size_t dhcpv6_raw_len;
 237         bool dhcpv6_assignall;
 238
 239         char *upstream;
 240         size_t upstream_len;
 241
 242         char *filter_class;
 243 };
 244
 245 extern struct list_head interfaces;
 246
 247 #define RA_MANAGED_NO_MFLAG     0
 248 #define RA_MANAGED_MFLAG        1
 249 #define RA_MANAGED_NO_AFLAG     2
 250
 251
 252 // Exported main functions
 253 int odhcpd_register(struct odhcpd_event *event);
 254 int odhcpd_deregister(struct odhcpd_event *event);
 255 void odhcpd_process(struct odhcpd_event *event);
 256
 257 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 258                 struct iovec *iov, size_t iov_len,
 259                 const struct interface *iface);
 260 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 261                 struct in6_addr *addr);
 262 struct interface* odhcpd_get_interface_by_name(const char *name);
 263 int odhcpd_get_interface_config(const char *ifname, const char *what);
 264 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 265 struct interface* odhcpd_get_interface_by_index(int ifindex);
 266 struct interface* odhcpd_get_master_interface(void);
 267 int odhcpd_urandom(void *data, size_t len);
 268
 269 void odhcpd_run(void);
 270 time_t odhcpd_time(void);
 271 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 272 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 273 const char *odhcpd_print_mac(const uint8_t *mac, const size_t len);
 274
 275 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 276 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 277
 278 int odhcpd_netmask2bitlen(bool v6, void *mask);
 279 bool odhcpd_bitlen2netmask(bool v6, unsigned int bits, void *mask);
 280 bool odhcpd_valid_hostname(const char *name);
 281
 282 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 283
 284 #ifdef WITH_UBUS
 285 int ubus_init(void);
 286 const char* ubus_get_ifname(const char *name);
 287 void ubus_apply_network(void);
 288 bool ubus_has_prefix(const char *name, const char *ifname);
 289 void ubus_bcast_dhcp_event(const char *type, const uint8_t *mac, const size_t mac_len,
 290                 const struct in_addr *addr, const char *name, const char *interface);
 291 #endif
 292
 293 int netlink_add_netevent_handler(struct netevent_handler *hdlr);
 294 ssize_t netlink_get_interface_addrs(const int ifindex, bool v6,
 295                 struct odhcpd_ipaddr **addrs);
 296 int netlink_setup_route(const struct in6_addr *addr, const int prefixlen,
 297                 const int ifindex, const struct in6_addr *gw,
 298                 const uint32_t metric, const bool add);
 299 int netlink_setup_proxy_neigh(const struct in6_addr *addr,
 300                 const int ifindex, const bool add);
 301 int netlink_setup_addr(struct odhcpd_ipaddr *addr,
 302                 const int ifindex, const bool v6, const bool add);
 303 void netlink_dump_neigh_table(const bool proxy);
 304 void netlink_dump_addr_table(const bool v6);
 305
 306 // Exported module initializers
 307 int netlink_init(void);
 308 int router_init(void);
 309 int dhcpv6_init(void);
 310 int ndp_init(void);
 311 #ifdef DHCPV4_SUPPORT
 312 int dhcpv4_init(void);
 313
 314 int dhcpv4_setup_interface(struct interface *iface, bool enable);
 315 #endif
 316 int router_setup_interface(struct interface *iface, bool enable);
 317 int dhcpv6_setup_interface(struct interface *iface, bool enable);
 318 int ndp_setup_interface(struct interface *iface, bool enable);
 319
 320 void odhcpd_reload(void);