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 #include <linux/neighbour.h>
  31
  32 #include <stdint.h>
  33 #include <stdbool.h>
  34
  35 #include "uloop.h"
  36 #include "list.h"
  37
  38 #define DEBUG
  39 #ifdef DEBUG
  40 #define DPRINTF(level, ...) if (debug >= level) fprintf(stderr, __VA_ARGS__);
  41 #else
  42 #define DPRINTF(...) do {} while(0)
  43 #endif
  44
  45 #ifndef __packed
  46 #define __packed __attribute__((packed))
  47 #endif
  48
  49 #define __uc(c) ((unsigned char *)(c))
  50
  51 #define MAC_FMT "%02x:%02x:%02x:%02x:%02x:%02x"
  52 #define MAC_BUF(_c) __uc(_c)[0], __uc(_c)[1], __uc(_c)[2], __uc(_c)[3], __uc(_c)[4], __uc(_c)[5]
  53
  54 #define IP_FMT  "%d.%d.%d.%d"
  55 #define IP_BUF(_c) __uc(_c)[0], __uc(_c)[1], __uc(_c)[2], __uc(_c)[3]
  56
  57 #define DUMMY_IP ((uint8_t *) "\x01\x01\x01\x01")
  58
  59 #define DHCP_FLAG_BROADCAST     (1 << 15)
  60
  61 struct relayd_interface {
  62         struct list_head list;
  63         struct uloop_fd fd;
  64         struct uloop_fd bcast_fd;
  65         struct sockaddr_ll sll;
  66         struct sockaddr_ll bcast_sll;
  67         char ifname[IFNAMSIZ];
  68         struct list_head hosts;
  69         uint8_t src_ip[4];
  70         bool managed;
  71         int rt_table;
  72 };
  73
  74 struct relayd_host {
  75         struct list_head list;
  76         struct list_head routes;
  77         struct relayd_interface *rif;
  78         uint8_t lladdr[ETH_ALEN];
  79         uint8_t ipaddr[4];
  80         struct uloop_timeout timeout;
  81         int cleanup_pending;
  82 };
  83
  84 struct relayd_route {
  85         struct list_head list;
  86         uint8_t dest[4];
  87         uint8_t mask;
  88 };
  89
  90 struct arp_packet {
  91         struct ether_header eth;
  92         struct ether_arp arp;
  93 } __packed;
  94
  95 struct rtnl_req {
  96         struct nlmsghdr nl;
  97         struct rtmsg rt;
  98 } __packed;
  99
 100 extern struct list_head interfaces;
 101 extern int debug;
 102 extern int route_table;
 103 extern uint8_t local_addr[4];
 104 extern int local_route_table;
 105
 106 void rtnl_route_set(struct relayd_host *host, struct relayd_route *route, bool add);
 107
 108 static inline void relayd_add_route(struct relayd_host *host, struct relayd_route *route)
 109 {
 110         rtnl_route_set(host, route, true);
 111 }
 112
 113 static inline void relayd_del_route(struct relayd_host *host, struct relayd_route *route)
 114 {
 115         rtnl_route_set(host, route, false);
 116 }
 117
 118 void relayd_add_interface_routes(struct relayd_interface *rif);
 119 void relayd_del_interface_routes(struct relayd_interface *rif);
 120
 121 int relayd_rtnl_init(void);
 122 void relayd_rtnl_done(void);
 123
 124 struct relayd_host *relayd_refresh_host(struct relayd_interface *rif,
 125                                         const uint8_t *lladdr,
 126                                         const uint8_t *ipaddr);
 127 void relayd_add_host_route(struct relayd_host *host, const uint8_t *ipaddr, uint8_t mask);
 128 void relayd_add_pending_route(const uint8_t *gateway, const uint8_t *dest, uint8_t mask, int timeout);
 129
 130 void relayd_forward_bcast_packet(struct relayd_interface *from_rif, void *packet, int len);
 131 bool relayd_handle_dhcp_packet(struct relayd_interface *rif, void *data, int len, bool forward);
 132
 133 #endif