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