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 _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
  58 struct interface;
  59 extern struct list_head leases;
  60
  61 struct odhcpd_event {
  62         struct uloop_fd uloop;
  63         void (*handle_dgram)(void *addr, void *data, size_t len,
  64                         struct interface *iface, void *dest_addr);
  65         void (*handle_error)(int error);
  66 };
  67
  68
  69 struct odhcpd_ipaddr {
  70         struct in6_addr addr;
  71         uint8_t prefix;
  72         uint8_t dprefix;
  73         uint32_t preferred;
  74         uint32_t valid;
  75 };
  76
  77 enum odhcpd_mode {
  78         RELAYD_DISABLED,
  79         RELAYD_SERVER,
  80         RELAYD_RELAY,
  81         RELAYD_HYBRID
  82 };
  83
  84
  85 struct config {
  86         bool legacy;
  87         char *dhcp_cb;
  88         char *dhcp_statefile;
  89 } config;
  90
  91
  92 struct lease {
  93         struct list_head head;
  94         struct in_addr ipaddr;
  95         uint32_t hostid;
  96         struct ether_addr mac;
  97         uint16_t duid_len;
  98         uint8_t *duid;
  99         char hostname[];
 100 };
 101
 102
 103 struct interface {
 104         struct list_head head;
 105
 106         int ifindex;
 107         char ifname[IF_NAMESIZE];
 108         char name[IF_NAMESIZE];
 109
 110         // Runtime data
 111         struct uloop_timeout timer_rs;
 112         struct list_head ia_assignments;
 113         struct odhcpd_ipaddr ia_addr[8];
 114         size_t ia_addr_len;
 115         bool ia_reconf;
 116
 117         // DHCPv4
 118         struct odhcpd_event dhcpv6_event;
 119         struct odhcpd_event dhcpv4_event;
 120         struct odhcpd_event ndp_event;
 121         struct list_head dhcpv4_assignments;
 122
 123         // Managed PD
 124         char dhcpv6_pd_manager[128];
 125         struct in6_addr dhcpv6_pd_cer;
 126
 127         // Services
 128         enum odhcpd_mode ra;
 129         enum odhcpd_mode dhcpv6;
 130         enum odhcpd_mode ndp;
 131         enum odhcpd_mode dhcpv4;
 132
 133         // Config
 134         bool inuse;
 135         bool external;
 136         bool master;
 137         bool ignore;
 138         bool always_rewrite_dns;
 139         bool ra_not_onlink;
 140         bool ra_advrouter;
 141         bool no_dynamic_dhcp;
 142
 143         int learn_routes;
 144         int default_router;
 145         int managed;
 146         int route_preference;
 147         int ra_maxinterval;
 148
 149         // DHCPv4
 150         struct in_addr dhcpv4_start;
 151         struct in_addr dhcpv4_end;
 152         struct in_addr *dhcpv4_router;
 153         size_t dhcpv4_router_cnt;
 154         struct in_addr *dhcpv4_dns;
 155         size_t dhcpv4_dns_cnt;
 156         uint32_t dhcpv4_leasetime;
 157
 158         // DNS
 159         struct in6_addr *dns;
 160         size_t dns_cnt;
 161         uint8_t *search;
 162         size_t search_len;
 163
 164         void *dhcpv6_raw;
 165         size_t dhcpv6_raw_len;
 166
 167         char *upstream;
 168         size_t upstream_len;
 169
 170         char *filter_class;
 171 };
 172
 173 extern struct list_head interfaces;
 174
 175 #define RELAYD_MANAGED_MFLAG    1
 176 #define RELAYD_MANAGED_NO_AFLAG 2
 177
 178
 179 // Exported main functions
 180 int odhcpd_open_rtnl(void);
 181 int odhcpd_register(struct odhcpd_event *event);
 182 void odhcpd_process(struct odhcpd_event *event);
 183
 184 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 185                 struct iovec *iov, size_t iov_len,
 186                 const struct interface *iface);
 187 ssize_t odhcpd_get_interface_addresses(int ifindex,
 188                 struct odhcpd_ipaddr *addrs, size_t cnt);
 189 int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr);
 190 struct interface* odhcpd_get_interface_by_name(const char *name);
 191 int odhcpd_get_interface_config(const char *ifname, const char *what);
 192 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 193 struct interface* odhcpd_get_interface_by_index(int ifindex);
 194 struct interface* odhcpd_get_master_interface(void);
 195 int odhcpd_urandom(void *data, size_t len);
 196 void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen,
 197                 const struct interface *iface, const struct in6_addr *gw,
 198                 int metric, bool add);
 199
 200 void odhcpd_run(void);
 201 time_t odhcpd_time(void);
 202 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 203 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 204
 205 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 206 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 207
 208 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 209
 210 #ifdef WITH_UBUS
 211 int init_ubus(void);
 212 const char* ubus_get_ifname(const char *name);
 213 void ubus_apply_network(void);
 214 bool ubus_has_prefix(const char *name, const char *ifname);
 215 #endif
 216
 217
 218 // Exported module initializers
 219 int init_router(void);
 220 int init_dhcpv6(void);
 221 int init_dhcpv4(void);
 222 int init_ndp(void);
 223
 224 int setup_router_interface(struct interface *iface, bool enable);
 225 int setup_dhcpv6_interface(struct interface *iface, bool enable);
 226 int setup_ndp_interface(struct interface *iface, bool enable);
 227 int setup_dhcpv4_interface(struct interface *iface, bool enable);
 228
 229 void odhcpd_reload(void);