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 #define RELAYD_MAX_ADDRS 8
  47
  48 #define INFINITE_VALID(x) ((x) == 0)
  49
  50 #define _unused __attribute__((unused))
  51 #define _packed __attribute__((packed))
  52
  53
  54 #define ALL_IPV6_NODES {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  55                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}}}
  56
  57 #define ALL_IPV6_ROUTERS {{{0xff, 0x02, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,\
  58                 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02}}}
  59
  60 #define IN6_IS_ADDR_ULA(a) (((a)->s6_addr32[0] & htonl(0xfe000000)) == htonl(0xfc000000))
  61
  62 struct interface;
  63 struct nl_sock;
  64 extern struct list_head leases;
  65
  66 struct odhcpd_event {
  67         struct uloop_fd uloop;
  68         void (*handle_dgram)(void *addr, void *data, size_t len,
  69                         struct interface *iface, void *dest_addr);
  70         void (*handle_error)(struct odhcpd_event *e, int error);
  71         void (*recv_msgs)(struct odhcpd_event *e);
  72 };
  73
  74
  75 struct odhcpd_ipaddr {
  76         struct in6_addr addr;
  77         uint8_t prefix;
  78         uint8_t dprefix;
  79         uint32_t preferred;
  80         uint32_t valid;
  81 };
  82
  83 enum odhcpd_mode {
  84         RELAYD_DISABLED,
  85         RELAYD_SERVER,
  86         RELAYD_RELAY,
  87         RELAYD_HYBRID
  88 };
  89
  90
  91 enum odhcpd_assignment_flags {
  92         OAF_BOUND       = (1 << 0),
  93         OAF_STATIC      = (1 << 1),
  94 };
  95
  96 struct config {
  97         bool legacy;
  98         char *dhcp_cb;
  99         char *dhcp_statefile;
 100         int log_level;
 101 } config;
 102
 103
 104 struct lease {
 105         struct list_head head;
 106         struct in_addr ipaddr;
 107         uint32_t hostid;
 108         struct ether_addr mac;
 109         uint16_t duid_len;
 110         uint8_t *duid;
 111         uint32_t dhcpv4_leasetime;
 112         char hostname[];
 113 };
 114
 115
 116 struct interface {
 117         struct list_head head;
 118
 119         int ifindex;
 120         char ifname[IF_NAMESIZE];
 121         char name[IF_NAMESIZE];
 122
 123         // Runtime data
 124         struct uloop_timeout timer_rs;
 125         struct list_head ia_assignments;
 126         struct odhcpd_ipaddr ia_addr[RELAYD_MAX_ADDRS];
 127         size_t ia_addr_len;
 128
 129         // DHCPv4
 130         struct odhcpd_event dhcpv6_event;
 131         struct odhcpd_event dhcpv4_event;
 132         struct odhcpd_event ndp_event;
 133         struct list_head dhcpv4_assignments;
 134
 135         // Managed PD
 136         char dhcpv6_pd_manager[128];
 137         struct in6_addr dhcpv6_pd_cer;
 138
 139         // Services
 140         enum odhcpd_mode ra;
 141         enum odhcpd_mode dhcpv6;
 142         enum odhcpd_mode ndp;
 143         enum odhcpd_mode dhcpv4;
 144
 145         // Config
 146         bool inuse;
 147         bool external;
 148         bool master;
 149         bool ignore;
 150         bool always_rewrite_dns;
 151         bool ra_not_onlink;
 152         bool ra_advrouter;
 153         bool no_dynamic_dhcp;
 154
 155         int learn_routes;
 156         int default_router;
 157         int managed;
 158         int route_preference;
 159         int ra_maxinterval;
 160
 161         // DHCPv4
 162         struct in_addr dhcpv4_start;
 163         struct in_addr dhcpv4_end;
 164         struct in_addr *dhcpv4_router;
 165         size_t dhcpv4_router_cnt;
 166         struct in_addr *dhcpv4_dns;
 167         size_t dhcpv4_dns_cnt;
 168         uint32_t dhcpv4_leasetime;
 169
 170         // DNS
 171         struct in6_addr *dns;
 172         size_t dns_cnt;
 173         uint8_t *search;
 174         size_t search_len;
 175
 176         void *dhcpv6_raw;
 177         size_t dhcpv6_raw_len;
 178
 179         char *upstream;
 180         size_t upstream_len;
 181
 182         char *filter_class;
 183 };
 184
 185 extern struct list_head interfaces;
 186
 187 #define RELAYD_MANAGED_MFLAG    1
 188 #define RELAYD_MANAGED_NO_AFLAG 2
 189
 190
 191 // Exported main functions
 192 int odhcpd_register(struct odhcpd_event *event);
 193 int odhcpd_deregister(struct odhcpd_event *event);
 194 void odhcpd_process(struct odhcpd_event *event);
 195
 196 struct nl_sock *odhcpd_create_nl_socket(int protocol);
 197 ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest,
 198                 struct iovec *iov, size_t iov_len,
 199                 const struct interface *iface);
 200 ssize_t odhcpd_get_interface_addresses(int ifindex,
 201                 struct odhcpd_ipaddr *addrs, size_t cnt);
 202 int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr);
 203 struct interface* odhcpd_get_interface_by_name(const char *name);
 204 int odhcpd_get_interface_config(const char *ifname, const char *what);
 205 int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]);
 206 struct interface* odhcpd_get_interface_by_index(int ifindex);
 207 struct interface* odhcpd_get_master_interface(void);
 208 int odhcpd_urandom(void *data, size_t len);
 209 int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen,
 210                 const struct interface *iface, const struct in6_addr *gw,
 211                 const uint32_t metric, const bool add);
 212 int odhcpd_setup_proxy_neigh(const struct in6_addr *addr,
 213                 const struct interface *iface, const bool add);
 214
 215 void odhcpd_run(void);
 216 time_t odhcpd_time(void);
 217 ssize_t odhcpd_unhexlify(uint8_t *dst, size_t len, const char *src);
 218 void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len);
 219
 220 int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits);
 221 void odhcpd_bmemcpy(void *av, const void *bv, size_t bits);
 222
 223 int config_parse_interface(void *data, size_t len, const char *iname, bool overwrite);
 224
 225 #ifdef WITH_UBUS
 226 int init_ubus(void);
 227 const char* ubus_get_ifname(const char *name);
 228 void ubus_apply_network(void);
 229 bool ubus_has_prefix(const char *name, const char *ifname);
 230 #endif
 231
 232
 233 // Exported module initializers
 234 int init_router(void);
 235 int init_dhcpv6(void);
 236 int init_dhcpv4(void);
 237 int init_ndp(void);
 238
 239 int setup_router_interface(struct interface *iface, bool enable);
 240 int setup_dhcpv6_interface(struct interface *iface, bool enable);
 241 int setup_ndp_interface(struct interface *iface, bool enable);
 242 int setup_dhcpv4_interface(struct interface *iface, bool enable);
 243
 244 void odhcpd_reload(void);