relayd.h

   1 /*
   2  *   Copyright (C) 2010 Felix Fietkau <nbd@openwrt.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  *   You should have received a copy of the GNU General Public License
  14  *   along with this program; if not, write to the Free Software
  15  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  16  *
  17  */
  18 #ifndef __RELAYD_H
  19 #define __RELAYD_H
  20
  21 #include <arpa/inet.h>
  22 #include <net/if.h>
  23 #include <net/ethernet.h>
  24 #include <netinet/if_ether.h>
  25 #include <netinet/ip.h>
  26 #include <netinet/udp.h>
  27
  28 #include <linux/if_packet.h>
  29 #include <linux/rtnetlink.h>
  30
  31 #include <stdint.h>
  32 #include <stdbool.h>
  33
  34 #include <libubox/uloop.h>
  35 #include <libubox/list.h>
  36
  37 #define DEBUG
  38 #ifdef DEBUG
  39 #define DPRINTF(level, ...) if (debug >= level) fprintf(stderr, __VA_ARGS__);
  40 #else
  41 #define DPRINTF(...) do {} while(0)
  42 #endif
  43
  44 #ifndef __packed
  45 #define __packed __attribute__((packed))
  46 #endif
  47
  48 #define __uc(c) ((unsigned char *)(c))
  49
  50 #define MAC_FMT "%02x:%02x:%02x:%02x:%02x:%02x"
  51 #define MAC_BUF(_c) __uc(_c)[0], __uc(_c)[1], __uc(_c)[2], __uc(_c)[3], __uc(_c)[4], __uc(_c)[5]
  52
  53 #define IP_FMT  "%d.%d.%d.%d"
  54 #define IP_BUF(_c) __uc(_c)[0], __uc(_c)[1], __uc(_c)[2], __uc(_c)[3]
  55
  56 #define DUMMY_IP ((uint8_t *) "\x01\x01\x01\x01")
  57
  58 #define DHCP_FLAG_BROADCAST     (1 << 15)
  59
  60 struct relayd_interface {
  61         struct list_head list;
  62         struct uloop_fd fd;
  63         struct uloop_fd bcast_fd;
  64         struct sockaddr_ll sll;
  65         struct sockaddr_ll bcast_sll;
  66         char ifname[IFNAMSIZ];
  67         struct list_head hosts;
  68         uint8_t src_ip[4];
  69         bool managed;
  70         int rt_table;
  71 };
  72
  73 struct relayd_host {
  74         struct list_head list;
  75         struct list_head routes;
  76         struct relayd_interface *rif;
  77         uint8_t lladdr[ETH_ALEN];
  78         uint8_t ipaddr[4];
  79         struct uloop_timeout timeout;
  80         int cleanup_pending;
  81 };
  82
  83 struct relayd_route {
  84         struct list_head list;
  85         uint8_t dest[4];
  86         uint8_t mask;
  87 };
  88
  89 struct arp_packet {
  90         struct ether_header eth;
  91         struct ether_arp arp;
  92 } __packed;
  93
  94 struct rtnl_req {
  95         struct nlmsghdr nl;
  96         struct rtmsg rt;
  97 } __packed;
  98
  99 extern struct list_head interfaces;
 100 extern int debug;
 101 extern int route_table;
 102 extern uint8_t local_addr[4];
 103 extern int local_route_table;
 104
 105 void rtnl_route_set(struct relayd_host *host, struct relayd_route *route, bool add);
 106
 107 static inline void relayd_add_route(struct relayd_host *host, struct relayd_route *route)
 108 {
 109         rtnl_route_set(host, route, true);
 110 }
 111
 112 static inline void relayd_del_route(struct relayd_host *host, struct relayd_route *route)
 113 {
 114         rtnl_route_set(host, route, false);
 115 }
 116
 117 void relayd_add_interface_routes(struct relayd_interface *rif);
 118 void relayd_del_interface_routes(struct relayd_interface *rif);
 119
 120 int relayd_rtnl_init(void);
 121 void relayd_rtnl_done(void);
 122
 123 struct relayd_host *relayd_refresh_host(struct relayd_interface *rif,
 124                                         const uint8_t *lladdr,
 125                                         const uint8_t *ipaddr);
 126 void relayd_add_host_route(struct relayd_host *host, const uint8_t *ipaddr, uint8_t mask);
 127 void relayd_add_pending_route(const uint8_t *gateway, const uint8_t *dest, uint8_t mask, int timeout);
 128
 129 void relayd_forward_bcast_packet(struct relayd_interface *from_rif, void *packet, int len);
 130 bool relayd_handle_dhcp_packet(struct relayd_interface *rif, void *data, int len, bool forward, bool parse);
 131
 132 #endif