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 <net/if.h>
  20 #include <stdbool.h>
  21 #include <syslog.h>
  22
  23 #include "libubox/blobmsg.h"
  24
  25 #ifndef typeof
  26 #define typeof __typeof
  27 #endif
  28
  29 #ifndef container_of
  30 #define container_of(ptr, type, member) (           \
  31     (type *)( (char *)ptr - offsetof(type,member) ))
  32 #endif
  33
  34 #include "libubox/list.h"
  35 #include "libubox/uloop.h"
  36
  37 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
  38
  39 // RFC 6106 defines this router advertisement option
  40 #define ND_OPT_ROUTE_INFO 24
  41 #define ND_OPT_RECURSIVE_DNS 25
  42 #define ND_OPT_DNS_SEARCH 31
  43
  44 #define RELAYD_BUFFER_SIZE 8192
  45 #define RELAYD_MAX_PREFIXES 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
  60 struct interface;
  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)(int error);
  68 };
  69
  70
  71 struct odhcpd_ipaddr {
  72         struct in6_addr addr;
  73         uint8_t prefix;
  74         uint8_t dprefix;
  75         uint32_t preferred;
  76         uint32_t valid;
  77 };
  78
  79 enum odhcpd_mode {
  80         RELAYD_DISABLED,
  81         RELAYD_SERVER,
  82         RELAYD_RELAY,
  83         RELAYD_HYBRID
  84 };
  85
  86
  87 enum odhcpd_assignment_flags {
  88         OAF_BOUND       = (1 << 0),
  89         OAF_STATIC      = (1 << 1),
  90 };
  91
  92 struct config {
  93         bool legacy;
  94         char *dhcp_cb;
  95         char *dhcp_statefile;
  96 } config;
  97
  98
  99 struct lease {
 100         struct list_head head;
 101         struct in_addr ipaddr;
 102         uint32_t hostid;
 103         struct ether_addr mac;
 104         uint16_t duid_len;
 105         uint8_t *duid;
 106         uint32_t dhcpv4_leasetime;
 107         char hostname[];
 108 };
 109
 110
 111 struct interface {
 112         struct list_head head;
 113
 114         int ifindex;
 115         char ifname[IF_NAMESIZE];
 116         char name[IF_NAMESIZE];
 117
 118         // Runtime data
 119         struct uloop_timeout timer_rs;
 120         struct list_head ia_assignments;
 121         struct odhcpd_ipaddr ia_addr[8];
 122         size_t ia_addr_len;
 123         bool ia_reconf;
 124
 125         // DHCPv4
 126         struct odhcpd_event dhcpv6_event;
 127         struct odhcpd_event dhcpv4_event;
 128         struct odhcpd_event ndp_event;
 129         struct list_head dhcpv4_assignments;
 130
 131         // Managed PD
 132         char dhcpv6_pd_manager[128];
 133         struct in6_addr dhcpv6_pd_cer;
 134
 135         // Services
 136         enum odhcpd_mode ra;
 137         enum odhcpd_mode dhcpv6;
 138         enum odhcpd_mode ndp;
 139         enum odhcpd_mode dhcpv4;
 140
 141         // Config
 142         bool inuse;
 143         bool external;
 144         bool master;
 145         bool ignore;
 146         bool always_rewrite_dns;
 147         bool ra_not_onlink;
 148         bool ra_advrouter;
 149         bool no_dynamic_dhcp;
 150
 151         int learn_routes;
 152         int default_router;
 153         int managed;
 154         int route_preference;
 155         int ra_maxinterval;
 156
 157         // DHCPv4
 158         struct in_addr dhcpv4_start;
 159         struct in_addr dhcpv4_end;
 160         struct in_addr *dhcpv4_router;
 161         size_t dhcpv4_router_cnt;
 162         struct in_addr *dhcpv4_dns;
 163         size_t dhcpv4_dns_cnt;
 164         uint32_t dhcpv4_leasetime;
 165
 166         // DNS
 167         struct in6_addr *dns;
 168         size_t dns_cnt;
 169         uint8_t *search;
 170         size_t search_len;
 171
 172         void *dhcpv6_raw;
 173         size_t dhcpv6_raw_len;
 174
 175         char *upstream;
 176         size_t upstream_len;
 177
 178         char *filter_class;
 179 };
 180
 181 extern struct list_head interfaces;
 182
 183 #define RELAYD_MANAGED_MFLAG    1
 184 #define RELAYD_MANAGED_NO_AFLAG 2
 185
 186
 187 // Exported main functions
 188 int odhcpd_open_rtnl(void);
 189 int odhcpd_register(struct odhcpd_event *event);
 190 void odhcpd_process(struct odhcpd_event *event);
 191
 192 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 193                 struct iovec *iov, size_t iov_len,
 194                 const struct interface *iface);
 195 ssize_t odhcpd_get_interface_addresses(int ifindex,
 196                 struct odhcpd_ipaddr *addrs, size_t cnt);
 197 int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr);
 198 struct interface* odhcpd_get_interface_by_name(const char *name);
 199 int odhcpd_get_interface_config(const char *ifname, const char *what);
 200 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 201 struct interface* odhcpd_get_interface_by_index(int ifindex);
 202 struct interface* odhcpd_get_master_interface(void);
 203 int odhcpd_urandom(void *data, size_t len);
 204 void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen,
 205                 const struct interface *iface, const struct in6_addr *gw,
 206                 int metric, bool add);
 207
 208 void odhcpd_run(void);
 209 time_t odhcpd_time(void);
 210 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 211 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 212
 213 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 214 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 215
 216 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 217
 218 #ifdef WITH_UBUS
 219 int init_ubus(void);
 220 const char* ubus_get_ifname(const char *name);
 221 void ubus_apply_network(void);
 222 bool ubus_has_prefix(const char *name, const char *ifname);
 223 #endif
 224
 225
 226 // Exported module initializers
 227 int init_router(void);
 228 int init_dhcpv6(void);
 229 int init_dhcpv4(void);
 230 int init_ndp(void);
 231
 232 int setup_router_interface(struct interface *iface, bool enable);
 233 int setup_dhcpv6_interface(struct interface *iface, bool enable);
 234 int setup_ndp_interface(struct interface *iface, bool enable);
 235 int setup_dhcpv4_interface(struct interface *iface, bool enable);
 236
 237 void odhcpd_reload(void);