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1275 |
phoenix |
/*
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* AX.25 release 037
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*
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* This code REQUIRES 2.1.15 or higher/ NET3.038
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*
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* This module:
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* This module is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Other kernels modules in this kit are generally BSD derived. See the copyright headers.
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*
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*
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* History
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| 16 |
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* AX.25 020 Jonathan(G4KLX) First go.
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* AX.25 022 Jonathan(G4KLX) Added the actual meat to this - we now have a nice heard list.
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* AX.25 025 Alan(GW4PTS) First cut at autobinding by route scan.
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* AX.25 028b Jonathan(G4KLX) Extracted AX25 control block from the
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* sock structure. Device removal now
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* removes the heard structure.
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* AX.25 029 Steven(GW7RRM) Added /proc information for uid/callsign mapping.
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* Jonathan(G4KLX) Handling of IP mode in the routing list and /proc entry.
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* AX.25 030 Jonathan(G4KLX) Added digi-peaters to routing table, and
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* ioctls to manipulate them. Added port
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* configuration.
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* AX.25 031 Jonathan(G4KLX) Added concept of default route.
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* Joerg(DL1BKE) ax25_rt_build_path() find digipeater list and device by
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* destination call. Needed for IP routing via digipeater
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* Jonathan(G4KLX) Added routing for IP datagram packets.
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* Joerg(DL1BKE) Changed routing for IP datagram and VC to use a default
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* route if available. Does not overwrite default routes
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* on route-table overflow anymore.
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* Joerg(DL1BKE) Fixed AX.25 routing of IP datagram and VC, new ioctl()
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* "SIOCAX25OPTRT" to set IP mode and a 'permanent' flag
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* on routes.
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* AX.25 033 Jonathan(G4KLX) Remove auto-router.
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| 38 |
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* Joerg(DL1BKE) Moved BPQ Ethernet driver to separate device.
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* AX.25 035 Frederic(F1OAT) Support for pseudo-digipeating.
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* Jonathan(G4KLX) Support for packet forwarding.
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| 41 |
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* Arnaldo C. Melo s/suser/capable/
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*/
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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| 48 |
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#include <linux/kernel.h>
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| 49 |
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#include <linux/sched.h>
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#include <linux/timer.h>
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| 51 |
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#include <linux/string.h>
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| 52 |
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#include <linux/sockios.h>
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| 53 |
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#include <linux/net.h>
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#include <net/ax25.h>
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#include <linux/inet.h>
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| 56 |
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#include <linux/netdevice.h>
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| 57 |
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#include <linux/if_arp.h>
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| 58 |
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#include <linux/skbuff.h>
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| 59 |
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#include <net/sock.h>
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#include <asm/uaccess.h>
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| 61 |
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#include <asm/system.h>
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#include <linux/fcntl.h>
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| 63 |
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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| 65 |
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#include <linux/init.h>
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| 67 |
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static ax25_route *ax25_route_list;
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| 69 |
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static ax25_route *ax25_find_route(ax25_address *, struct net_device *);
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| 71 |
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/*
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* small macro to drop non-digipeated digipeaters and reverse path
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| 73 |
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*/
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| 74 |
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static inline void ax25_route_invert(ax25_digi *in, ax25_digi *out)
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| 75 |
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{
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| 76 |
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int k;
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| 77 |
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| 78 |
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for (k = 0; k < in->ndigi; k++)
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| 79 |
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if (!in->repeated[k])
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| 80 |
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break;
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| 81 |
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| 82 |
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in->ndigi = k;
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| 84 |
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ax25_digi_invert(in, out);
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| 85 |
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}
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| 86 |
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| 87 |
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void ax25_rt_device_down(struct net_device *dev)
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| 88 |
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{
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| 89 |
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ax25_route *s, *t, *ax25_rt = ax25_route_list;
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| 90 |
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| 91 |
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while (ax25_rt != NULL) {
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| 92 |
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s = ax25_rt;
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| 93 |
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ax25_rt = ax25_rt->next;
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| 95 |
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if (s->dev == dev) {
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| 96 |
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if (ax25_route_list == s) {
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| 97 |
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ax25_route_list = s->next;
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| 98 |
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if (s->digipeat != NULL)
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| 99 |
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kfree(s->digipeat);
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| 100 |
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kfree(s);
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| 101 |
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} else {
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| 102 |
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for (t = ax25_route_list; t != NULL; t = t->next) {
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| 103 |
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if (t->next == s) {
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| 104 |
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t->next = s->next;
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if (s->digipeat != NULL)
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| 106 |
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kfree(s->digipeat);
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| 107 |
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kfree(s);
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| 108 |
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break;
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| 109 |
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}
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| 110 |
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}
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| 111 |
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}
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| 112 |
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}
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| 113 |
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}
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| 114 |
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}
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| 115 |
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| 116 |
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int ax25_rt_ioctl(unsigned int cmd, void *arg)
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{
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unsigned long flags;
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ax25_route *s, *t, *ax25_rt;
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struct ax25_routes_struct route;
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struct ax25_route_opt_struct rt_option;
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ax25_dev *ax25_dev;
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int i;
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switch (cmd) {
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case SIOCADDRT:
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if (copy_from_user(&route, arg, sizeof(route)))
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return -EFAULT;
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if ((ax25_dev = ax25_addr_ax25dev(&route.port_addr)) == NULL)
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| 130 |
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return -EINVAL;
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| 131 |
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if (route.digi_count > AX25_MAX_DIGIS)
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return -EINVAL;
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| 133 |
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for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
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| 134 |
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if (ax25cmp(&ax25_rt->callsign, &route.dest_addr) == 0 && ax25_rt->dev == ax25_dev->dev) {
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| 135 |
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if (ax25_rt->digipeat != NULL) {
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kfree(ax25_rt->digipeat);
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| 137 |
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ax25_rt->digipeat = NULL;
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| 138 |
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}
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| 139 |
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if (route.digi_count != 0) {
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| 140 |
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if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL)
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| 141 |
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return -ENOMEM;
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| 142 |
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ax25_rt->digipeat->lastrepeat = -1;
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ax25_rt->digipeat->ndigi = route.digi_count;
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for (i = 0; i < route.digi_count; i++) {
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ax25_rt->digipeat->repeated[i] = 0;
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ax25_rt->digipeat->calls[i] = route.digi_addr[i];
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}
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}
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| 149 |
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return 0;
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| 150 |
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}
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| 151 |
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}
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| 152 |
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if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL)
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| 153 |
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return -ENOMEM;
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| 154 |
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ax25_rt->callsign = route.dest_addr;
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ax25_rt->dev = ax25_dev->dev;
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ax25_rt->digipeat = NULL;
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| 157 |
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ax25_rt->ip_mode = ' ';
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| 158 |
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if (route.digi_count != 0) {
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| 159 |
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if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) {
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kfree(ax25_rt);
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return -ENOMEM;
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| 162 |
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}
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| 163 |
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ax25_rt->digipeat->lastrepeat = -1;
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ax25_rt->digipeat->ndigi = route.digi_count;
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for (i = 0; i < route.digi_count; i++) {
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| 166 |
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ax25_rt->digipeat->repeated[i] = 0;
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ax25_rt->digipeat->calls[i] = route.digi_addr[i];
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| 168 |
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}
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| 169 |
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}
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| 170 |
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save_flags(flags); cli();
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| 171 |
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ax25_rt->next = ax25_route_list;
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| 172 |
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ax25_route_list = ax25_rt;
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restore_flags(flags);
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| 174 |
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break;
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| 175 |
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| 176 |
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case SIOCDELRT:
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| 177 |
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if (copy_from_user(&route, arg, sizeof(route)))
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| 178 |
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return -EFAULT;
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| 179 |
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if ((ax25_dev = ax25_addr_ax25dev(&route.port_addr)) == NULL)
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| 180 |
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return -EINVAL;
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| 181 |
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ax25_rt = ax25_route_list;
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| 182 |
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while (ax25_rt != NULL) {
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| 183 |
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s = ax25_rt;
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| 184 |
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ax25_rt = ax25_rt->next;
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| 185 |
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if (s->dev == ax25_dev->dev && ax25cmp(&route.dest_addr, &s->callsign) == 0) {
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| 186 |
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if (ax25_route_list == s) {
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| 187 |
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ax25_route_list = s->next;
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| 188 |
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if (s->digipeat != NULL)
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| 189 |
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kfree(s->digipeat);
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| 190 |
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kfree(s);
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| 191 |
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} else {
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| 192 |
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for (t = ax25_route_list; t != NULL; t = t->next) {
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| 193 |
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if (t->next == s) {
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| 194 |
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t->next = s->next;
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| 195 |
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if (s->digipeat != NULL)
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| 196 |
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kfree(s->digipeat);
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| 197 |
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kfree(s);
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| 198 |
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break;
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| 199 |
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}
|
| 200 |
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}
|
| 201 |
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}
|
| 202 |
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}
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| 203 |
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}
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| 204 |
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break;
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| 205 |
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| 206 |
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case SIOCAX25OPTRT:
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| 207 |
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if (copy_from_user(&rt_option, arg, sizeof(rt_option)))
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| 208 |
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return -EFAULT;
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| 209 |
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if ((ax25_dev = ax25_addr_ax25dev(&rt_option.port_addr)) == NULL)
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| 210 |
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return -EINVAL;
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| 211 |
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for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
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| 212 |
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if (ax25_rt->dev == ax25_dev->dev && ax25cmp(&rt_option.dest_addr, &ax25_rt->callsign) == 0) {
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| 213 |
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switch (rt_option.cmd) {
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| 214 |
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case AX25_SET_RT_IPMODE:
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| 215 |
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switch (rt_option.arg) {
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| 216 |
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case ' ':
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| 217 |
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case 'D':
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| 218 |
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case 'V':
|
| 219 |
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ax25_rt->ip_mode = rt_option.arg;
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| 220 |
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break;
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| 221 |
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default:
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| 222 |
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return -EINVAL;
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| 223 |
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}
|
| 224 |
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break;
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| 225 |
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default:
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| 226 |
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return -EINVAL;
|
| 227 |
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}
|
| 228 |
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}
|
| 229 |
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}
|
| 230 |
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break;
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| 231 |
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| 232 |
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default:
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| 233 |
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return -EINVAL;
|
| 234 |
|
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}
|
| 235 |
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| 236 |
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return 0;
|
| 237 |
|
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}
|
| 238 |
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| 239 |
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int ax25_rt_get_info(char *buffer, char **start, off_t offset, int length)
|
| 240 |
|
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{
|
| 241 |
|
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ax25_route *ax25_rt;
|
| 242 |
|
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int len = 0;
|
| 243 |
|
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off_t pos = 0;
|
| 244 |
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off_t begin = 0;
|
| 245 |
|
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char *callsign;
|
| 246 |
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int i;
|
| 247 |
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| 248 |
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cli();
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| 249 |
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| 250 |
|
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len += sprintf(buffer, "callsign dev mode digipeaters\n");
|
| 251 |
|
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|
| 252 |
|
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for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
|
| 253 |
|
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if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0)
|
| 254 |
|
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callsign = "default";
|
| 255 |
|
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else
|
| 256 |
|
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callsign = ax2asc(&ax25_rt->callsign);
|
| 257 |
|
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len += sprintf(buffer + len, "%-9s %-4s",
|
| 258 |
|
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callsign,
|
| 259 |
|
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ax25_rt->dev ? ax25_rt->dev->name : "???");
|
| 260 |
|
|
|
| 261 |
|
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switch (ax25_rt->ip_mode) {
|
| 262 |
|
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case 'V':
|
| 263 |
|
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len += sprintf(buffer + len, " vc");
|
| 264 |
|
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break;
|
| 265 |
|
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case 'D':
|
| 266 |
|
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len += sprintf(buffer + len, " dg");
|
| 267 |
|
|
break;
|
| 268 |
|
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default:
|
| 269 |
|
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len += sprintf(buffer + len, " *");
|
| 270 |
|
|
break;
|
| 271 |
|
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}
|
| 272 |
|
|
|
| 273 |
|
|
if (ax25_rt->digipeat != NULL)
|
| 274 |
|
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for (i = 0; i < ax25_rt->digipeat->ndigi; i++)
|
| 275 |
|
|
len += sprintf(buffer + len, " %s", ax2asc(&ax25_rt->digipeat->calls[i]));
|
| 276 |
|
|
|
| 277 |
|
|
len += sprintf(buffer + len, "\n");
|
| 278 |
|
|
|
| 279 |
|
|
pos = begin + len;
|
| 280 |
|
|
|
| 281 |
|
|
if (pos < offset) {
|
| 282 |
|
|
len = 0;
|
| 283 |
|
|
begin = pos;
|
| 284 |
|
|
}
|
| 285 |
|
|
|
| 286 |
|
|
if (pos > offset + length)
|
| 287 |
|
|
break;
|
| 288 |
|
|
}
|
| 289 |
|
|
|
| 290 |
|
|
sti();
|
| 291 |
|
|
|
| 292 |
|
|
*start = buffer + (offset - begin);
|
| 293 |
|
|
len -= (offset - begin);
|
| 294 |
|
|
|
| 295 |
|
|
if (len > length) len = length;
|
| 296 |
|
|
|
| 297 |
|
|
return len;
|
| 298 |
|
|
}
|
| 299 |
|
|
|
| 300 |
|
|
/*
|
| 301 |
|
|
* Find AX.25 route
|
| 302 |
|
|
*/
|
| 303 |
|
|
static ax25_route *ax25_find_route(ax25_address *addr, struct net_device *dev)
|
| 304 |
|
|
{
|
| 305 |
|
|
ax25_route *ax25_spe_rt = NULL;
|
| 306 |
|
|
ax25_route *ax25_def_rt = NULL;
|
| 307 |
|
|
ax25_route *ax25_rt;
|
| 308 |
|
|
|
| 309 |
|
|
/*
|
| 310 |
|
|
* Bind to the physical interface we heard them on, or the default
|
| 311 |
|
|
* route if none is found;
|
| 312 |
|
|
*/
|
| 313 |
|
|
for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) {
|
| 314 |
|
|
if (dev == NULL) {
|
| 315 |
|
|
if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL)
|
| 316 |
|
|
ax25_spe_rt = ax25_rt;
|
| 317 |
|
|
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL)
|
| 318 |
|
|
ax25_def_rt = ax25_rt;
|
| 319 |
|
|
} else {
|
| 320 |
|
|
if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev)
|
| 321 |
|
|
ax25_spe_rt = ax25_rt;
|
| 322 |
|
|
if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev)
|
| 323 |
|
|
ax25_def_rt = ax25_rt;
|
| 324 |
|
|
}
|
| 325 |
|
|
}
|
| 326 |
|
|
|
| 327 |
|
|
if (ax25_spe_rt != NULL)
|
| 328 |
|
|
return ax25_spe_rt;
|
| 329 |
|
|
|
| 330 |
|
|
return ax25_def_rt;
|
| 331 |
|
|
}
|
| 332 |
|
|
|
| 333 |
|
|
/*
|
| 334 |
|
|
* Adjust path: If you specify a default route and want to connect
|
| 335 |
|
|
* a target on the digipeater path but w/o having a special route
|
| 336 |
|
|
* set before, the path has to be truncated from your target on.
|
| 337 |
|
|
*/
|
| 338 |
|
|
static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat)
|
| 339 |
|
|
{
|
| 340 |
|
|
int k;
|
| 341 |
|
|
|
| 342 |
|
|
for (k = 0; k < digipeat->ndigi; k++) {
|
| 343 |
|
|
if (ax25cmp(addr, &digipeat->calls[k]) == 0)
|
| 344 |
|
|
break;
|
| 345 |
|
|
}
|
| 346 |
|
|
|
| 347 |
|
|
digipeat->ndigi = k;
|
| 348 |
|
|
}
|
| 349 |
|
|
|
| 350 |
|
|
|
| 351 |
|
|
/*
|
| 352 |
|
|
* Find which interface to use.
|
| 353 |
|
|
*/
|
| 354 |
|
|
int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr)
|
| 355 |
|
|
{
|
| 356 |
|
|
ax25_route *ax25_rt;
|
| 357 |
|
|
ax25_address *call;
|
| 358 |
|
|
|
| 359 |
|
|
if ((ax25_rt = ax25_find_route(addr, NULL)) == NULL)
|
| 360 |
|
|
return -EHOSTUNREACH;
|
| 361 |
|
|
|
| 362 |
|
|
if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL)
|
| 363 |
|
|
return -EHOSTUNREACH;
|
| 364 |
|
|
|
| 365 |
|
|
if ((call = ax25_findbyuid(current->euid)) == NULL) {
|
| 366 |
|
|
if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE))
|
| 367 |
|
|
return -EPERM;
|
| 368 |
|
|
call = (ax25_address *)ax25->ax25_dev->dev->dev_addr;
|
| 369 |
|
|
}
|
| 370 |
|
|
|
| 371 |
|
|
ax25->source_addr = *call;
|
| 372 |
|
|
|
| 373 |
|
|
if (ax25_rt->digipeat != NULL) {
|
| 374 |
|
|
if ((ax25->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL)
|
| 375 |
|
|
return -ENOMEM;
|
| 376 |
|
|
memcpy(ax25->digipeat, ax25_rt->digipeat, sizeof(ax25_digi));
|
| 377 |
|
|
ax25_adjust_path(addr, ax25->digipeat);
|
| 378 |
|
|
}
|
| 379 |
|
|
|
| 380 |
|
|
if (ax25->sk != NULL)
|
| 381 |
|
|
ax25->sk->zapped = 0;
|
| 382 |
|
|
|
| 383 |
|
|
return 0;
|
| 384 |
|
|
}
|
| 385 |
|
|
|
| 386 |
|
|
/*
|
| 387 |
|
|
* dl1bke 960117: build digipeater path
|
| 388 |
|
|
* dl1bke 960301: use the default route if it exists
|
| 389 |
|
|
*/
|
| 390 |
|
|
ax25_route *ax25_rt_find_route(ax25_address *addr, struct net_device *dev)
|
| 391 |
|
|
{
|
| 392 |
|
|
static ax25_route route;
|
| 393 |
|
|
ax25_route *ax25_rt;
|
| 394 |
|
|
|
| 395 |
|
|
if ((ax25_rt = ax25_find_route(addr, dev)) == NULL) {
|
| 396 |
|
|
route.next = NULL;
|
| 397 |
|
|
route.callsign = *addr;
|
| 398 |
|
|
route.dev = dev;
|
| 399 |
|
|
route.digipeat = NULL;
|
| 400 |
|
|
route.ip_mode = ' ';
|
| 401 |
|
|
return &route;
|
| 402 |
|
|
}
|
| 403 |
|
|
|
| 404 |
|
|
return ax25_rt;
|
| 405 |
|
|
}
|
| 406 |
|
|
|
| 407 |
|
|
struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, ax25_address *dest, ax25_digi *digi)
|
| 408 |
|
|
{
|
| 409 |
|
|
struct sk_buff *skbn;
|
| 410 |
|
|
unsigned char *bp;
|
| 411 |
|
|
int len;
|
| 412 |
|
|
|
| 413 |
|
|
len = digi->ndigi * AX25_ADDR_LEN;
|
| 414 |
|
|
|
| 415 |
|
|
if (skb_headroom(skb) < len) {
|
| 416 |
|
|
if ((skbn = skb_realloc_headroom(skb, len)) == NULL) {
|
| 417 |
|
|
printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory\n");
|
| 418 |
|
|
return NULL;
|
| 419 |
|
|
}
|
| 420 |
|
|
|
| 421 |
|
|
if (skb->sk != NULL)
|
| 422 |
|
|
skb_set_owner_w(skbn, skb->sk);
|
| 423 |
|
|
|
| 424 |
|
|
kfree_skb(skb);
|
| 425 |
|
|
|
| 426 |
|
|
skb = skbn;
|
| 427 |
|
|
}
|
| 428 |
|
|
|
| 429 |
|
|
bp = skb_push(skb, len);
|
| 430 |
|
|
|
| 431 |
|
|
ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS);
|
| 432 |
|
|
|
| 433 |
|
|
return skb;
|
| 434 |
|
|
}
|
| 435 |
|
|
|
| 436 |
|
|
/*
|
| 437 |
|
|
* Free all memory associated with routing structures.
|
| 438 |
|
|
*/
|
| 439 |
|
|
void __exit ax25_rt_free(void)
|
| 440 |
|
|
{
|
| 441 |
|
|
ax25_route *s, *ax25_rt = ax25_route_list;
|
| 442 |
|
|
|
| 443 |
|
|
while (ax25_rt != NULL) {
|
| 444 |
|
|
s = ax25_rt;
|
| 445 |
|
|
ax25_rt = ax25_rt->next;
|
| 446 |
|
|
|
| 447 |
|
|
if (s->digipeat != NULL)
|
| 448 |
|
|
kfree(s->digipeat);
|
| 449 |
|
|
|
| 450 |
|
|
kfree(s);
|
| 451 |
|
|
}
|
| 452 |
|
|
}
|
