mdw@git.distorted.org.uk Git - secnet/blob - netlink.h

   1 /*
   2  * This file is part of secnet.
   3  * See README for full list of copyright holders.
   4  *
   5  * secnet is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version d of the License, or
   8  * (at your option) any later version.
   9  *
  10  * secnet is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * version 3 along with secnet; if not, see
  17  * https://www.gnu.org/licenses/gpl.html.
  18  */
  19
  20 #ifndef netlink_h
  21 #define netlink_h
  22
  23 #include "ipaddr.h"
  24
  25 #define DEFAULT_BUFSIZE 2048
  26 #define DEFAULT_MTU 1000
  27 #define ICMP_BUFSIZE 1024
  28
  29 struct netlink;
  30
  31 struct netlink_client {
  32     closure_t cl;
  33     struct netlink_if ops;
  34     struct netlink *nst;
  35     struct ipset *networks;
  36     struct subnet_list *subnets; /* Same information as 'networks' */
  37     uint32_t priority; /* Higher priority clients have their networks
  38                           checked first during routing.  This allows
  39                           things like laptops to supersede whole
  40                           networks. */
  41     netlink_deliver_fn *deliver;
  42     void *dst;
  43     string_t name;
  44     uint32_t link_quality;
  45     int32_t mtu;
  46     uint32_t options;
  47     uint32_t outcount;
  48     bool_t up; /* Should these routes exist in the kernel? */
  49     bool_t kup; /* Do these routes exist in the kernel? */
  50     struct netlink_client *next;
  51 };
  52
  53 /* options field in 'struct netlink_client' */
  54 #define OPT_SOFTROUTE   1
  55 #define OPT_ALLOWROUTE  2
  56
  57 typedef bool_t netlink_route_fn(void *cst, struct netlink_client *routes);
  58
  59 /* Netlink provides one function to the device driver, to call to deliver
  60    a packet from the device. The device driver provides one function to
  61    netlink, for it to call to deliver a packet to the device. */
  62
  63 struct netlink {
  64     closure_t cl;
  65     void *dst; /* Pointer to host interface state */
  66     cstring_t name;
  67     struct ipset *networks; /* Local networks */
  68     struct subnet_list *subnets; /* Same as networks, for display */
  69     struct ipset *remote_networks; /* Allowable remote networks */
  70     uint32_t local_address; /* host interface address */
  71     uint32_t secnet_address; /* our own address, or the address of the
  72                                 other end of a point-to-point link */
  73     bool_t ptp;
  74     int32_t mtu;
  75     struct netlink_client *clients; /* Linked list of clients */
  76     struct netlink_client **routes; /* Array of clients, sorted by priority */
  77     int32_t n_clients;
  78     netlink_deliver_fn *deliver_to_host; /* Provided by driver */
  79     netlink_route_fn *set_routes; /* Provided by driver */
  80     struct buffer_if icmp; /* Buffer for assembly of outgoing ICMP */
  81     uint32_t outcount; /* Packets sent to host */
  82     uint32_t localcount; /* Packets sent to secnet */
  83 };
  84
  85 extern netlink_deliver_fn *netlink_init(struct netlink *st,
  86                                         void *dst, struct cloc loc,
  87                                         dict_t *dict, cstring_t description,
  88                                         netlink_route_fn *set_routes,
  89                                         netlink_deliver_fn *to_host);
  90
  91 #endif /* netlink_h */