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