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 #define RELAYD_MAX_PREFIXES 8
  45 #define RELAYD_MAX_ADDRS 8
  46
  47 #define INFINITE_VALID(x) ((x) == 0)
  48
  49 #define _unused __attribute__((unused))
  50 #define _packed __attribute__((packed))
  51
  52
  53 #define ALL_IPV6_NODES {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  54                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}}}
  55
  56 #define ALL_IPV6_ROUTERS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  57                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}}}
  58
  59 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
  60
  61 struct interface;
  62 struct nl_sock;
  63 extern struct list_head leases;
  64
  65 struct odhcpd_event {
  66         struct uloop_fd uloop;
  67         void (*handle_dgram)(void *addr, void *data, size_t len,
  68                         struct interface *iface, void *dest_addr);
  69         void (*handle_error)(struct odhcpd_event *e, int error);
  70         void (*recv_msgs)(struct odhcpd_event *e);
  71 };
  72
  73
  74 struct odhcpd_ipaddr {
  75         struct in6_addr addr;
  76         uint8_t prefix;
  77         uint8_t dprefix;
  78         uint32_t preferred;
  79         uint32_t valid;
  80 };
  81
  82 enum odhcpd_mode {
  83         RELAYD_DISABLED,
  84         RELAYD_SERVER,
  85         RELAYD_RELAY,
  86         RELAYD_HYBRID
  87 };
  88
  89
  90 enum odhcpd_assignment_flags {
  91         OAF_BOUND       = (1 << 0),
  92         OAF_STATIC      = (1 << 1),
  93 };
  94
  95 struct config {
  96         bool legacy;
  97         bool main_dhcpv4;
  98         char *dhcp_cb;
  99         char *dhcp_statefile;
 100         int log_level;
 101 } config;
 102
 103
 104 struct lease {
 105         struct list_head head;
 106         struct in_addr ipaddr;
 107         uint32_t hostid;
 108         struct ether_addr mac;
 109         uint16_t duid_len;
 110         uint8_t *duid;
 111         uint32_t dhcpv4_leasetime;
 112         char hostname[];
 113 };
 114
 115
 116 struct interface {
 117         struct list_head head;
 118
 119         int ifindex;
 120         char *ifname;
 121         const char *name;
 122
 123         // Runtime data
 124         struct uloop_timeout timer_rs;
 125         struct list_head ia_assignments;
 126         struct odhcpd_ipaddr ia_addr[RELAYD_MAX_ADDRS];
 127         size_t ia_addr_len;
 128
 129         // DHCPv4
 130         struct odhcpd_event dhcpv6_event;
 131         struct odhcpd_event dhcpv4_event;
 132         struct odhcpd_event ndp_event;
 133         struct list_head dhcpv4_assignments;
 134
 135         // Managed PD
 136         char dhcpv6_pd_manager[128];
 137         struct in6_addr dhcpv6_pd_cer;
 138
 139         // Services
 140         enum odhcpd_mode ra;
 141         enum odhcpd_mode dhcpv6;
 142         enum odhcpd_mode ndp;
 143         enum odhcpd_mode dhcpv4;
 144
 145         // Config
 146         bool inuse;
 147         bool external;
 148         bool master;
 149         bool ignore;
 150         bool always_rewrite_dns;
 151         bool ra_not_onlink;
 152         bool ra_advrouter;
 153         bool ra_useleasetime;
 154         bool no_dynamic_dhcp;
 155
 156         // RA
 157         int learn_routes;
 158         int default_router;
 159         int managed;
 160         int route_preference;
 161         int ra_maxinterval;
 162         int ra_mininterval;
 163         int ra_lifetime;
 164         uint32_t ra_reachabletime;
 165         uint32_t ra_retranstime;
 166         uint32_t ra_hoplimit;
 167         int ra_mtu;
 168
 169         // DHCPv4
 170         struct in_addr dhcpv4_start;
 171         struct in_addr dhcpv4_end;
 172         struct in_addr *dhcpv4_router;
 173         size_t dhcpv4_router_cnt;
 174         struct in_addr *dhcpv4_dns;
 175         size_t dhcpv4_dns_cnt;
 176         uint32_t dhcpv4_leasetime;
 177
 178         // DNS
 179         struct in6_addr *dns;
 180         size_t dns_cnt;
 181         uint8_t *search;
 182         size_t search_len;
 183
 184         void *dhcpv6_raw;
 185         size_t dhcpv6_raw_len;
 186
 187         char *upstream;
 188         size_t upstream_len;
 189
 190         char *filter_class;
 191 };
 192
 193 extern struct list_head interfaces;
 194
 195 #define RELAYD_MANAGED_MFLAG    1
 196 #define RELAYD_MANAGED_NO_AFLAG 2
 197
 198
 199 // Exported main functions
 200 int odhcpd_register(struct odhcpd_event *event);
 201 int odhcpd_deregister(struct odhcpd_event *event);
 202 void odhcpd_process(struct odhcpd_event *event);
 203
 204 struct nl_sock *odhcpd_create_nl_socket(int protocol);
 205 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 206                 struct iovec *iov, size_t iov_len,
 207                 const struct interface *iface);
 208 ssize_t odhcpd_get_interface_addresses(int ifindex,
 209                 struct odhcpd_ipaddr *addrs, size_t cnt);
 210 int odhcpd_get_interface_dns_addr(const struct interface *iface,
 211                 struct in6_addr *addr);
 212 struct interface* odhcpd_get_interface_by_name(const char *name);
 213 int odhcpd_get_interface_config(const char *ifname, const char *what);
 214 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 215 struct interface* odhcpd_get_interface_by_index(int ifindex);
 216 struct interface* odhcpd_get_master_interface(void);
 217 int odhcpd_urandom(void *data, size_t len);
 218 int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
 219                 const struct interface *iface, const struct in6_addr *gw,
 220                 const uint32_t metric, const bool add);
 221 int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
 222                 const struct interface *iface, const bool add);
 223
 224 void odhcpd_run(void);
 225 time_t odhcpd_time(void);
 226 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 227 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 228
 229 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 230 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 231
 232 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 233
 234 void ndp_handle_addr6_dump(void);
 235 void ndp_rqs_addr6_dump(void);
 236
 237 #ifdef WITH_UBUS
 238 int init_ubus(void);
 239 const char* ubus_get_ifname(const char *name);
 240 void ubus_apply_network(void);
 241 bool ubus_has_prefix(const char *name, const char *ifname);
 242 #endif
 243
 244
 245 // Exported module initializers
 246 int init_router(void);
 247 int init_dhcpv6(void);
 248 int init_dhcpv4(void);
 249 int init_ndp(void);
 250
 251 int setup_router_interface(struct interface *iface, bool enable);
 252 int setup_dhcpv6_interface(struct interface *iface, bool enable);
 253 int setup_ndp_interface(struct interface *iface, bool enable);
 254 int setup_dhcpv4_interface(struct interface *iface, bool enable);
 255
 256 void odhcpd_reload(void);