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net/ax25/ax25_route.c
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// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* * Copyright (C) Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) * Copyright (C) Steven Whitehouse GW7RRM (stevew@acm.org) * Copyright (C) Joerg Reuter DL1BKE (jreuter@yaina.de) * Copyright (C) Hans-Joachim Hetscher DD8NE (dd8ne@bnv-bamberg.de) * Copyright (C) Frederic Rible F1OAT (frible@teaser.fr) */ |
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#include <linux/capability.h> |
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#include <linux/errno.h> #include <linux/types.h> #include <linux/socket.h> #include <linux/timer.h> #include <linux/in.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/string.h> #include <linux/sockios.h> #include <linux/net.h> |
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#include <linux/slab.h> |
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#include <net/ax25.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/if_arp.h> #include <linux/skbuff.h> #include <linux/spinlock.h> #include <net/sock.h> |
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#include <linux/uaccess.h> |
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#include <linux/fcntl.h> #include <linux/mm.h> #include <linux/interrupt.h> #include <linux/init.h> #include <linux/seq_file.h> |
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#include <linux/export.h> |
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static ax25_route *ax25_route_list; |
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DEFINE_RWLOCK(ax25_route_lock); |
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void ax25_rt_device_down(struct net_device *dev) { ax25_route *s, *t, *ax25_rt; |
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write_lock_bh(&ax25_route_lock); |
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ax25_rt = ax25_route_list; while (ax25_rt != NULL) { s = ax25_rt; ax25_rt = ax25_rt->next; if (s->dev == dev) { if (ax25_route_list == s) { ax25_route_list = s->next; |
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kfree(s->digipeat); |
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kfree(s); } else { for (t = ax25_route_list; t != NULL; t = t->next) { if (t->next == s) { t->next = s->next; |
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kfree(s->digipeat); |
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kfree(s); break; } } } } } |
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write_unlock_bh(&ax25_route_lock); |
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} |
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static int __must_check ax25_rt_add(struct ax25_routes_struct *route) |
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{ ax25_route *ax25_rt; ax25_dev *ax25_dev; int i; if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) return -EINVAL; if (route->digi_count > AX25_MAX_DIGIS) return -EINVAL; |
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write_lock_bh(&ax25_route_lock); |
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ax25_rt = ax25_route_list; while (ax25_rt != NULL) { if (ax25cmp(&ax25_rt->callsign, &route->dest_addr) == 0 && |
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ax25_rt->dev == ax25_dev->dev) { |
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kfree(ax25_rt->digipeat); ax25_rt->digipeat = NULL; |
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if (route->digi_count != 0) { if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { |
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write_unlock_bh(&ax25_route_lock); |
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return -ENOMEM; } ax25_rt->digipeat->lastrepeat = -1; ax25_rt->digipeat->ndigi = route->digi_count; for (i = 0; i < route->digi_count; i++) { ax25_rt->digipeat->repeated[i] = 0; ax25_rt->digipeat->calls[i] = route->digi_addr[i]; } } |
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write_unlock_bh(&ax25_route_lock); |
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return 0; } ax25_rt = ax25_rt->next; } if ((ax25_rt = kmalloc(sizeof(ax25_route), GFP_ATOMIC)) == NULL) { |
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write_unlock_bh(&ax25_route_lock); |
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return -ENOMEM; } |
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refcount_set(&ax25_rt->refcount, 1); |
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ax25_rt->callsign = route->dest_addr; ax25_rt->dev = ax25_dev->dev; ax25_rt->digipeat = NULL; ax25_rt->ip_mode = ' '; if (route->digi_count != 0) { if ((ax25_rt->digipeat = kmalloc(sizeof(ax25_digi), GFP_ATOMIC)) == NULL) { |
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write_unlock_bh(&ax25_route_lock); |
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kfree(ax25_rt); return -ENOMEM; } ax25_rt->digipeat->lastrepeat = -1; ax25_rt->digipeat->ndigi = route->digi_count; for (i = 0; i < route->digi_count; i++) { ax25_rt->digipeat->repeated[i] = 0; ax25_rt->digipeat->calls[i] = route->digi_addr[i]; } } ax25_rt->next = ax25_route_list; ax25_route_list = ax25_rt; |
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write_unlock_bh(&ax25_route_lock); |
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return 0; } |
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void __ax25_put_route(ax25_route *ax25_rt) |
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{ |
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kfree(ax25_rt->digipeat); kfree(ax25_rt); |
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} static int ax25_rt_del(struct ax25_routes_struct *route) { ax25_route *s, *t, *ax25_rt; ax25_dev *ax25_dev; if ((ax25_dev = ax25_addr_ax25dev(&route->port_addr)) == NULL) return -EINVAL; |
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write_lock_bh(&ax25_route_lock); |
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ax25_rt = ax25_route_list; while (ax25_rt != NULL) { s = ax25_rt; ax25_rt = ax25_rt->next; if (s->dev == ax25_dev->dev && ax25cmp(&route->dest_addr, &s->callsign) == 0) { if (ax25_route_list == s) { ax25_route_list = s->next; |
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ax25_put_route(s); |
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} else { for (t = ax25_route_list; t != NULL; t = t->next) { if (t->next == s) { t->next = s->next; |
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ax25_put_route(s); |
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break; } } } } } |
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write_unlock_bh(&ax25_route_lock); |
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return 0; } static int ax25_rt_opt(struct ax25_route_opt_struct *rt_option) { ax25_route *ax25_rt; ax25_dev *ax25_dev; int err = 0; if ((ax25_dev = ax25_addr_ax25dev(&rt_option->port_addr)) == NULL) return -EINVAL; |
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write_lock_bh(&ax25_route_lock); |
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ax25_rt = ax25_route_list; while (ax25_rt != NULL) { if (ax25_rt->dev == ax25_dev->dev && ax25cmp(&rt_option->dest_addr, &ax25_rt->callsign) == 0) { switch (rt_option->cmd) { case AX25_SET_RT_IPMODE: switch (rt_option->arg) { case ' ': case 'D': case 'V': ax25_rt->ip_mode = rt_option->arg; break; default: err = -EINVAL; goto out; } break; default: err = -EINVAL; goto out; } } ax25_rt = ax25_rt->next; } out: |
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write_unlock_bh(&ax25_route_lock); |
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return err; } int ax25_rt_ioctl(unsigned int cmd, void __user *arg) { struct ax25_route_opt_struct rt_option; struct ax25_routes_struct route; switch (cmd) { case SIOCADDRT: if (copy_from_user(&route, arg, sizeof(route))) return -EFAULT; return ax25_rt_add(&route); case SIOCDELRT: if (copy_from_user(&route, arg, sizeof(route))) return -EFAULT; return ax25_rt_del(&route); case SIOCAX25OPTRT: if (copy_from_user(&rt_option, arg, sizeof(rt_option))) return -EFAULT; return ax25_rt_opt(&rt_option); default: return -EINVAL; } } #ifdef CONFIG_PROC_FS static void *ax25_rt_seq_start(struct seq_file *seq, loff_t *pos) |
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__acquires(ax25_route_lock) |
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{ struct ax25_route *ax25_rt; int i = 1; |
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read_lock(&ax25_route_lock); |
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if (*pos == 0) return SEQ_START_TOKEN; for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { if (i == *pos) return ax25_rt; ++i; } return NULL; } static void *ax25_rt_seq_next(struct seq_file *seq, void *v, loff_t *pos) { ++*pos; |
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return (v == SEQ_START_TOKEN) ? ax25_route_list : |
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((struct ax25_route *) v)->next; } static void ax25_rt_seq_stop(struct seq_file *seq, void *v) |
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__releases(ax25_route_lock) |
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{ read_unlock(&ax25_route_lock); } static int ax25_rt_seq_show(struct seq_file *seq, void *v) { |
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char buf[11]; |
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if (v == SEQ_START_TOKEN) seq_puts(seq, "callsign dev mode digipeaters "); else { struct ax25_route *ax25_rt = v; const char *callsign; int i; if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0) callsign = "default"; else |
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callsign = ax2asc(buf, &ax25_rt->callsign); |
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seq_printf(seq, "%-9s %-4s", callsign, ax25_rt->dev ? ax25_rt->dev->name : "???"); switch (ax25_rt->ip_mode) { case 'V': seq_puts(seq, " vc"); break; case 'D': seq_puts(seq, " dg"); break; default: seq_puts(seq, " *"); break; } if (ax25_rt->digipeat != NULL) for (i = 0; i < ax25_rt->digipeat->ndigi; i++) |
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seq_printf(seq, " %s", ax2asc(buf, &ax25_rt->digipeat->calls[i])); |
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seq_puts(seq, " "); } return 0; } |
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const struct seq_operations ax25_rt_seqops = { |
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.start = ax25_rt_seq_start, .next = ax25_rt_seq_next, .stop = ax25_rt_seq_stop, .show = ax25_rt_seq_show, }; |
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#endif /* * Find AX.25 route * |
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* Only routes with a reference count of zero can be destroyed. |
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* Must be called with ax25_route_lock read locked. |
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*/ |
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ax25_route *ax25_get_route(ax25_address *addr, struct net_device *dev) |
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{ ax25_route *ax25_spe_rt = NULL; ax25_route *ax25_def_rt = NULL; ax25_route *ax25_rt; |
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/* * Bind to the physical interface we heard them on, or the default * route if none is found; */ for (ax25_rt = ax25_route_list; ax25_rt != NULL; ax25_rt = ax25_rt->next) { if (dev == NULL) { if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev != NULL) ax25_spe_rt = ax25_rt; if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev != NULL) ax25_def_rt = ax25_rt; } else { if (ax25cmp(&ax25_rt->callsign, addr) == 0 && ax25_rt->dev == dev) ax25_spe_rt = ax25_rt; if (ax25cmp(&ax25_rt->callsign, &null_ax25_address) == 0 && ax25_rt->dev == dev) ax25_def_rt = ax25_rt; } } ax25_rt = ax25_def_rt; if (ax25_spe_rt != NULL) ax25_rt = ax25_spe_rt; |
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return ax25_rt; } /* * Adjust path: If you specify a default route and want to connect * a target on the digipeater path but w/o having a special route * set before, the path has to be truncated from your target on. */ static inline void ax25_adjust_path(ax25_address *addr, ax25_digi *digipeat) { int k; for (k = 0; k < digipeat->ndigi; k++) { if (ax25cmp(addr, &digipeat->calls[k]) == 0) break; } digipeat->ndigi = k; } /* * Find which interface to use. */ int ax25_rt_autobind(ax25_cb *ax25, ax25_address *addr) { |
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ax25_uid_assoc *user; |
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ax25_route *ax25_rt; |
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int err = 0; |
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ax25_route_lock_use(); ax25_rt = ax25_get_route(addr, NULL); if (!ax25_rt) { ax25_route_lock_unuse(); |
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return -EHOSTUNREACH; |
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} |
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if ((ax25->ax25_dev = ax25_dev_ax25dev(ax25_rt->dev)) == NULL) { err = -EHOSTUNREACH; goto put; } |
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user = ax25_findbyuid(current_euid()); |
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if (user) { ax25->source_addr = user->call; ax25_uid_put(user); } else { |
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if (ax25_uid_policy && !capable(CAP_NET_BIND_SERVICE)) { err = -EPERM; goto put; } |
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ax25->source_addr = *(ax25_address *)ax25->ax25_dev->dev->dev_addr; |
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} |
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if (ax25_rt->digipeat != NULL) { |
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ax25->digipeat = kmemdup(ax25_rt->digipeat, sizeof(ax25_digi), GFP_ATOMIC); if (ax25->digipeat == NULL) { |
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err = -ENOMEM; goto put; } |
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ax25_adjust_path(addr, ax25->digipeat); } if (ax25->sk != NULL) { |
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local_bh_disable(); |
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bh_lock_sock(ax25->sk); sock_reset_flag(ax25->sk, SOCK_ZAPPED); bh_unlock_sock(ax25->sk); |
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local_bh_enable(); |
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} put: |
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ax25_route_lock_unuse(); |
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return err; |
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} |
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struct sk_buff *ax25_rt_build_path(struct sk_buff *skb, ax25_address *src, ax25_address *dest, ax25_digi *digi) { struct sk_buff *skbn; unsigned char *bp; int len; len = digi->ndigi * AX25_ADDR_LEN; if (skb_headroom(skb) < len) { if ((skbn = skb_realloc_headroom(skb, len)) == NULL) { printk(KERN_CRIT "AX.25: ax25_dg_build_path - out of memory "); return NULL; } if (skb->sk != NULL) skb_set_owner_w(skbn, skb->sk); |
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consume_skb(skb); |
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skb = skbn; } bp = skb_push(skb, len); ax25_addr_build(bp, src, dest, digi, AX25_COMMAND, AX25_MODULUS); return skb; } /* * Free all memory associated with routing structures. */ void __exit ax25_rt_free(void) { ax25_route *s, *ax25_rt = ax25_route_list; |
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write_lock_bh(&ax25_route_lock); |
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while (ax25_rt != NULL) { s = ax25_rt; ax25_rt = ax25_rt->next; |
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kfree(s->digipeat); |
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kfree(s); } |
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write_unlock_bh(&ax25_route_lock); |
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} |