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);
  65 };
  66
  67
  68 struct odhcpd_ipaddr {
  69         struct in6_addr addr;
  70         uint8_t prefix;
  71         uint32_t preferred;
  72         uint32_t valid;
  73 };
  74
  75 enum odhcpd_mode {
  76         RELAYD_DISABLED,
  77         RELAYD_SERVER,
  78         RELAYD_RELAY,
  79         RELAYD_HYBRID
  80 };
  81
  82
  83 struct config {
  84         bool legacy;
  85         char *dhcp_cb;
  86         char *dhcp_statefile;
  87 } config;
  88
  89
  90 struct lease {
  91         struct list_head head;
  92         struct in_addr ipaddr;
  93         uint32_t hostid;
  94         struct ether_addr mac;
  95         uint16_t duid_len;
  96         uint8_t *duid;
  97         char hostname[];
  98 };
  99
 100
 101 struct interface {
 102         struct list_head head;
 103
 104         int ifindex;
 105         char ifname[IF_NAMESIZE];
 106         char name[IF_NAMESIZE];
 107         bool inuse;
 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 dhcpv4_event;
 118         struct list_head dhcpv4_assignments;
 119
 120         // Services
 121         enum odhcpd_mode ra;
 122         enum odhcpd_mode dhcpv6;
 123         enum odhcpd_mode ndp;
 124         enum odhcpd_mode dhcpv4;
 125
 126         // Config
 127         bool external;
 128         bool master;
 129         bool ignore;
 130         bool always_rewrite_dns;
 131         bool deprecate_ula_if_public_avail;
 132         bool ra_not_onlink;
 133         bool no_dynamic_dhcp;
 134
 135         int learn_routes;
 136         int default_router;
 137         int managed;
 138         int route_preference;
 139
 140         // DHCPv4
 141         struct in_addr dhcpv4_start;
 142         struct in_addr dhcpv4_end;
 143         struct in_addr *dhcpv4_dns;
 144         size_t dhcpv4_dns_cnt;
 145         uint32_t dhcpv4_leasetime;
 146
 147         // DNS
 148         struct in6_addr *dns;
 149         size_t dns_cnt;
 150         uint8_t *search;
 151         size_t search_len;
 152
 153         char* static_ndp;
 154         size_t static_ndp_len;
 155
 156         char *upstream;
 157         size_t upstream_len;
 158 };
 159
 160 extern struct list_head interfaces;
 161
 162 #define RELAYD_MANAGED_MFLAG    1
 163 #define RELAYD_MANAGED_NO_AFLAG 2
 164
 165
 166 // Exported main functions
 167 int odhcpd_open_rtnl(void);
 168 int odhcpd_register(struct odhcpd_event *event);
 169
 170 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 171                 struct iovec *iov, size_t iov_len,
 172                 const struct interface *iface);
 173 ssize_t odhcpd_get_interface_addresses(int ifindex,
 174                 struct odhcpd_ipaddr *addrs, size_t cnt);
 175 struct interface* odhcpd_get_interface_by_name(const char *name);
 176 int odhcpd_get_interface_mtu(const char *ifname);
 177 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 178 struct interface* odhcpd_get_interface_by_index(int ifindex);
 179 struct interface* odhcpd_get_master_interface(void);
 180 void odhcpd_urandom(void *data, size_t len);
 181 void odhcpd_setup_route(const struct in6_addr *addr, int prefixlen,
 182                 const struct interface *iface, const struct in6_addr *gw, bool add);
 183
 184 void odhcpd_run(void);
 185 time_t odhcpd_time(void);
 186 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 187 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 188
 189 int config_parse_interface(struct blob_attr *b, const char *iname);
 190
 191 const char* ubus_get_ifname(const char *name);
 192 void ubus_apply_network(void);
 193
 194
 195 // Exported module initializers
 196 int init_router(void);
 197 int init_dhcpv6(void);
 198 int init_dhcpv4(void);
 199 int init_ndp(void);
 200 int init_ubus(void);
 201
 202 int setup_router_interface(struct interface *iface, bool enable);
 203 int setup_dhcpv6_interface(struct interface *iface, bool enable);
 204 int setup_ndp_interface(struct interface *iface, bool enable);
 205 int setup_dhcpv4_interface(struct interface *iface, bool enable);