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