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 RELAYD_BUFFER_SIZE 8192
  44
  45 #define INFINITE_VALID(x) ((x) == 0)
  46
  47 #define _unused __attribute__((unused))
  48 #define _packed __attribute__((packed))
  49
  50
  51 #define ALL_IPV6_NODES {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  52                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}}}
  53
  54 #define ALL_IPV6_ROUTERS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  55                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}}}
  56
  57 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
  58
  59 struct interface;
  60 struct nl_sock;
  61 extern struct list_head leases;
  62
  63 struct odhcpd_event {
  64         struct uloop_fd uloop;
  65         void (*handle_dgram)(void *addr, void *data, size_t len,
  66                         struct interface *iface, void *dest_addr);
  67         void (*handle_error)(struct odhcpd_event *e, int error);
  68         void (*recv_msgs)(struct odhcpd_event *e);
  69 };
  70
  71 union if_addr {
  72         struct in_addr in;
  73         struct in6_addr in6;
  74 };
  75
  76 struct odhcpd_ipaddr {
  77         union if_addr addr;
  78         uint8_t prefix;
  79
  80         /* ipv6 only */
  81         uint8_t dprefix;
  82         uint32_t preferred;
  83         uint32_t valid;
  84 };
  85
  86 enum odhcpd_mode {
  87         RELAYD_DISABLED,
  88         RELAYD_SERVER,
  89         RELAYD_RELAY,
  90         RELAYD_HYBRID
  91 };
  92
  93
  94 enum odhcpd_assignment_flags {
  95         OAF_BOUND       = (1 << 0),
  96         OAF_STATIC      = (1 << 1),
  97 };
  98
  99 struct config {
 100         bool legacy;
 101         bool main_dhcpv4;
 102         char *dhcp_cb;
 103         char *dhcp_statefile;
 104         int log_level;
 105 } config;
 106
 107
 108 struct lease {
 109         struct list_head head;
 110         struct in_addr ipaddr;
 111         uint32_t hostid;
 112         struct ether_addr mac;
 113         uint16_t duid_len;
 114         uint8_t *duid;
 115         uint32_t dhcpv4_leasetime;
 116         char hostname[];
 117 };
 118
 119
 120 struct interface {
 121         struct list_head head;
 122
 123         int ifindex;
 124         char *ifname;
 125         const char *name;
 126
 127         // Runtime data
 128         struct uloop_timeout timer_rs;
 129         struct list_head ia_assignments;
 130         struct odhcpd_ipaddr *ia_addr;
 131         size_t ia_addr_len;
 132
 133         // DHCPv4
 134         struct odhcpd_event dhcpv6_event;
 135         struct odhcpd_event dhcpv4_event;
 136         struct odhcpd_event ndp_event;
 137         struct list_head dhcpv4_assignments;
 138
 139         // Managed PD
 140         char dhcpv6_pd_manager[128];
 141         struct in6_addr dhcpv6_pd_cer;
 142
 143         // Services
 144         enum odhcpd_mode ra;
 145         enum odhcpd_mode dhcpv6;
 146         enum odhcpd_mode ndp;
 147         enum odhcpd_mode dhcpv4;
 148
 149         // Config
 150         bool inuse;
 151         bool external;
 152         bool master;
 153         bool ignore;
 154         bool always_rewrite_dns;
 155         bool ra_not_onlink;
 156         bool ra_advrouter;
 157         bool ra_useleasetime;
 158         bool no_dynamic_dhcp;
 159
 160         // RA
 161         int learn_routes;
 162         int default_router;
 163         int managed;
 164         int route_preference;
 165         int ra_maxinterval;
 166         int ra_mininterval;
 167         int ra_lifetime;
 168         uint32_t ra_reachabletime;
 169         uint32_t ra_retranstime;
 170         uint32_t ra_hoplimit;
 171         int ra_mtu;
 172
 173         // DHCPv4
 174         struct in_addr dhcpv4_start;
 175         struct in_addr dhcpv4_end;
 176         struct in_addr *dhcpv4_router;
 177         size_t dhcpv4_router_cnt;
 178         struct in_addr *dhcpv4_dns;
 179         size_t dhcpv4_dns_cnt;
 180         uint32_t dhcpv4_leasetime;
 181
 182         // DNS
 183         struct in6_addr *dns;
 184         size_t dns_cnt;
 185         uint8_t *search;
 186         size_t search_len;
 187
 188         void *dhcpv6_raw;
 189         size_t dhcpv6_raw_len;
 190
 191         char *upstream;
 192         size_t upstream_len;
 193
 194         char *filter_class;
 195 };
 196
 197 extern struct list_head interfaces;
 198
 199 #define RELAYD_MANAGED_MFLAG    1
 200 #define RELAYD_MANAGED_NO_AFLAG 2
 201
 202
 203 // Exported main functions
 204 int odhcpd_register(struct odhcpd_event *event);
 205 int odhcpd_deregister(struct odhcpd_event *event);
 206 void odhcpd_process(struct odhcpd_event *event);
 207
 208 struct nl_sock *odhcpd_create_nl_socket(int protocol);
 209 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 210                 struct iovec *iov, size_t iov_len,
 211                 const struct interface *iface);
 212 ssize_t odhcpd_get_interface_addresses(int ifindex, bool v6,
 213                 struct odhcpd_ipaddr **addrs);
 214 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 215                 struct in6_addr *addr);
 216 struct interface* odhcpd_get_interface_by_name(const char *name);
 217 int odhcpd_get_interface_config(const char *ifname, const char *what);
 218 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 219 struct interface* odhcpd_get_interface_by_index(int ifindex);
 220 struct interface* odhcpd_get_master_interface(void);
 221 int odhcpd_urandom(void *data, size_t len);
 222 int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
 223                 const struct interface *iface, const struct in6_addr *gw,
 224                 const uint32_t metric, const bool add);
 225 int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
 226                 const struct interface *iface, const bool add);
 227
 228 void odhcpd_run(void);
 229 time_t odhcpd_time(void);
 230 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 231 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 232
 233 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 234 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 235
 236 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 237
 238 #ifdef WITH_UBUS
 239 int init_ubus(void);
 240 const char* ubus_get_ifname(const char *name);
 241 void ubus_apply_network(void);
 242 bool ubus_has_prefix(const char *name, const char *ifname);
 243 #endif
 244
 245
 246 // Exported module initializers
 247 int init_router(void);
 248 int init_dhcpv6(void);
 249 int init_dhcpv4(void);
 250 int init_ndp(void);
 251
 252 int setup_router_interface(struct interface *iface, bool enable);
 253 int setup_dhcpv6_interface(struct interface *iface, bool enable);
 254 int setup_ndp_interface(struct interface *iface, bool enable);
 255 int setup_dhcpv4_interface(struct interface *iface, bool enable);
 256
 257 void odhcpd_reload(void);