diff options
Diffstat (limited to 'net/rose/rose_route.c')
| -rw-r--r-- | net/rose/rose_route.c | 1326 |
1 files changed, 1326 insertions, 0 deletions
diff --git a/net/rose/rose_route.c b/net/rose/rose_route.c new file mode 100644 index 000000000..fee772b46 --- /dev/null +++ b/net/rose/rose_route.c @@ -0,0 +1,1326 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * + * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + * Copyright (C) Terry Dawson VK2KTJ (terry@animats.net) + */ +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/kernel.h> +#include <linux/timer.h> +#include <linux/string.h> +#include <linux/sockios.h> +#include <linux/net.h> +#include <linux/slab.h> +#include <net/ax25.h> +#include <linux/inet.h> +#include <linux/netdevice.h> +#include <net/arp.h> +#include <linux/if_arp.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/tcp_states.h> +#include <linux/uaccess.h> +#include <linux/fcntl.h> +#include <linux/termios.h> /* For TIOCINQ/OUTQ */ +#include <linux/mm.h> +#include <linux/interrupt.h> +#include <linux/notifier.h> +#include <linux/init.h> +#include <net/rose.h> +#include <linux/seq_file.h> +#include <linux/export.h> + +static unsigned int rose_neigh_no = 1; + +static struct rose_node *rose_node_list; +static DEFINE_SPINLOCK(rose_node_list_lock); +static struct rose_neigh *rose_neigh_list; +static DEFINE_SPINLOCK(rose_neigh_list_lock); +static struct rose_route *rose_route_list; +static DEFINE_SPINLOCK(rose_route_list_lock); + +struct rose_neigh *rose_loopback_neigh; + +/* + * Add a new route to a node, and in the process add the node and the + * neighbour if it is new. + */ +static int __must_check rose_add_node(struct rose_route_struct *rose_route, + struct net_device *dev) +{ + struct rose_node *rose_node, *rose_tmpn, *rose_tmpp; + struct rose_neigh *rose_neigh; + int i, res = 0; + + spin_lock_bh(&rose_node_list_lock); + spin_lock_bh(&rose_neigh_list_lock); + + rose_node = rose_node_list; + while (rose_node != NULL) { + if ((rose_node->mask == rose_route->mask) && + (rosecmpm(&rose_route->address, &rose_node->address, + rose_route->mask) == 0)) + break; + rose_node = rose_node->next; + } + + if (rose_node != NULL && rose_node->loopback) { + res = -EINVAL; + goto out; + } + + rose_neigh = rose_neigh_list; + while (rose_neigh != NULL) { + if (ax25cmp(&rose_route->neighbour, + &rose_neigh->callsign) == 0 && + rose_neigh->dev == dev) + break; + rose_neigh = rose_neigh->next; + } + + if (rose_neigh == NULL) { + rose_neigh = kmalloc(sizeof(*rose_neigh), GFP_ATOMIC); + if (rose_neigh == NULL) { + res = -ENOMEM; + goto out; + } + + rose_neigh->callsign = rose_route->neighbour; + rose_neigh->digipeat = NULL; + rose_neigh->ax25 = NULL; + rose_neigh->dev = dev; + rose_neigh->count = 0; + rose_neigh->use = 0; + rose_neigh->dce_mode = 0; + rose_neigh->loopback = 0; + rose_neigh->number = rose_neigh_no++; + rose_neigh->restarted = 0; + + skb_queue_head_init(&rose_neigh->queue); + + timer_setup(&rose_neigh->ftimer, NULL, 0); + timer_setup(&rose_neigh->t0timer, NULL, 0); + + if (rose_route->ndigis != 0) { + rose_neigh->digipeat = + kmalloc(sizeof(ax25_digi), GFP_ATOMIC); + if (rose_neigh->digipeat == NULL) { + kfree(rose_neigh); + res = -ENOMEM; + goto out; + } + + rose_neigh->digipeat->ndigi = rose_route->ndigis; + rose_neigh->digipeat->lastrepeat = -1; + + for (i = 0; i < rose_route->ndigis; i++) { + rose_neigh->digipeat->calls[i] = + rose_route->digipeaters[i]; + rose_neigh->digipeat->repeated[i] = 0; + } + } + + rose_neigh->next = rose_neigh_list; + rose_neigh_list = rose_neigh; + } + + /* + * This is a new node to be inserted into the list. Find where it needs + * to be inserted into the list, and insert it. We want to be sure + * to order the list in descending order of mask size to ensure that + * later when we are searching this list the first match will be the + * best match. + */ + if (rose_node == NULL) { + rose_tmpn = rose_node_list; + rose_tmpp = NULL; + + while (rose_tmpn != NULL) { + if (rose_tmpn->mask > rose_route->mask) { + rose_tmpp = rose_tmpn; + rose_tmpn = rose_tmpn->next; + } else { + break; + } + } + + /* create new node */ + rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC); + if (rose_node == NULL) { + res = -ENOMEM; + goto out; + } + + rose_node->address = rose_route->address; + rose_node->mask = rose_route->mask; + rose_node->count = 1; + rose_node->loopback = 0; + rose_node->neighbour[0] = rose_neigh; + + if (rose_tmpn == NULL) { + if (rose_tmpp == NULL) { /* Empty list */ + rose_node_list = rose_node; + rose_node->next = NULL; + } else { + rose_tmpp->next = rose_node; + rose_node->next = NULL; + } + } else { + if (rose_tmpp == NULL) { /* 1st node */ + rose_node->next = rose_node_list; + rose_node_list = rose_node; + } else { + rose_tmpp->next = rose_node; + rose_node->next = rose_tmpn; + } + } + rose_neigh->count++; + + goto out; + } + + /* We have space, slot it in */ + if (rose_node->count < 3) { + rose_node->neighbour[rose_node->count] = rose_neigh; + rose_node->count++; + rose_neigh->count++; + } + +out: + spin_unlock_bh(&rose_neigh_list_lock); + spin_unlock_bh(&rose_node_list_lock); + + return res; +} + +/* + * Caller is holding rose_node_list_lock. + */ +static void rose_remove_node(struct rose_node *rose_node) +{ + struct rose_node *s; + + if ((s = rose_node_list) == rose_node) { + rose_node_list = rose_node->next; + kfree(rose_node); + return; + } + + while (s != NULL && s->next != NULL) { + if (s->next == rose_node) { + s->next = rose_node->next; + kfree(rose_node); + return; + } + + s = s->next; + } +} + +/* + * Caller is holding rose_neigh_list_lock. + */ +static void rose_remove_neigh(struct rose_neigh *rose_neigh) +{ + struct rose_neigh *s; + + del_timer_sync(&rose_neigh->ftimer); + del_timer_sync(&rose_neigh->t0timer); + + skb_queue_purge(&rose_neigh->queue); + + if ((s = rose_neigh_list) == rose_neigh) { + rose_neigh_list = rose_neigh->next; + if (rose_neigh->ax25) + ax25_cb_put(rose_neigh->ax25); + kfree(rose_neigh->digipeat); + kfree(rose_neigh); + return; + } + + while (s != NULL && s->next != NULL) { + if (s->next == rose_neigh) { + s->next = rose_neigh->next; + if (rose_neigh->ax25) + ax25_cb_put(rose_neigh->ax25); + kfree(rose_neigh->digipeat); + kfree(rose_neigh); + return; + } + + s = s->next; + } +} + +/* + * Caller is holding rose_route_list_lock. + */ +static void rose_remove_route(struct rose_route *rose_route) +{ + struct rose_route *s; + + if (rose_route->neigh1 != NULL) + rose_route->neigh1->use--; + + if (rose_route->neigh2 != NULL) + rose_route->neigh2->use--; + + if ((s = rose_route_list) == rose_route) { + rose_route_list = rose_route->next; + kfree(rose_route); + return; + } + + while (s != NULL && s->next != NULL) { + if (s->next == rose_route) { + s->next = rose_route->next; + kfree(rose_route); + return; + } + + s = s->next; + } +} + +/* + * "Delete" a node. Strictly speaking remove a route to a node. The node + * is only deleted if no routes are left to it. + */ +static int rose_del_node(struct rose_route_struct *rose_route, + struct net_device *dev) +{ + struct rose_node *rose_node; + struct rose_neigh *rose_neigh; + int i, err = 0; + + spin_lock_bh(&rose_node_list_lock); + spin_lock_bh(&rose_neigh_list_lock); + + rose_node = rose_node_list; + while (rose_node != NULL) { + if ((rose_node->mask == rose_route->mask) && + (rosecmpm(&rose_route->address, &rose_node->address, + rose_route->mask) == 0)) + break; + rose_node = rose_node->next; + } + + if (rose_node == NULL || rose_node->loopback) { + err = -EINVAL; + goto out; + } + + rose_neigh = rose_neigh_list; + while (rose_neigh != NULL) { + if (ax25cmp(&rose_route->neighbour, + &rose_neigh->callsign) == 0 && + rose_neigh->dev == dev) + break; + rose_neigh = rose_neigh->next; + } + + if (rose_neigh == NULL) { + err = -EINVAL; + goto out; + } + + for (i = 0; i < rose_node->count; i++) { + if (rose_node->neighbour[i] == rose_neigh) { + rose_neigh->count--; + + if (rose_neigh->count == 0 && rose_neigh->use == 0) + rose_remove_neigh(rose_neigh); + + rose_node->count--; + + if (rose_node->count == 0) { + rose_remove_node(rose_node); + } else { + switch (i) { + case 0: + rose_node->neighbour[0] = + rose_node->neighbour[1]; + fallthrough; + case 1: + rose_node->neighbour[1] = + rose_node->neighbour[2]; + break; + case 2: + break; + } + } + goto out; + } + } + err = -EINVAL; + +out: + spin_unlock_bh(&rose_neigh_list_lock); + spin_unlock_bh(&rose_node_list_lock); + + return err; +} + +/* + * Add the loopback neighbour. + */ +void rose_add_loopback_neigh(void) +{ + struct rose_neigh *sn; + + rose_loopback_neigh = kmalloc(sizeof(struct rose_neigh), GFP_KERNEL); + if (!rose_loopback_neigh) + return; + sn = rose_loopback_neigh; + + sn->callsign = null_ax25_address; + sn->digipeat = NULL; + sn->ax25 = NULL; + sn->dev = NULL; + sn->count = 0; + sn->use = 0; + sn->dce_mode = 1; + sn->loopback = 1; + sn->number = rose_neigh_no++; + sn->restarted = 1; + + skb_queue_head_init(&sn->queue); + + timer_setup(&sn->ftimer, NULL, 0); + timer_setup(&sn->t0timer, NULL, 0); + + spin_lock_bh(&rose_neigh_list_lock); + sn->next = rose_neigh_list; + rose_neigh_list = sn; + spin_unlock_bh(&rose_neigh_list_lock); +} + +/* + * Add a loopback node. + */ +int rose_add_loopback_node(const rose_address *address) +{ + struct rose_node *rose_node; + int err = 0; + + spin_lock_bh(&rose_node_list_lock); + + rose_node = rose_node_list; + while (rose_node != NULL) { + if ((rose_node->mask == 10) && + (rosecmpm(address, &rose_node->address, 10) == 0) && + rose_node->loopback) + break; + rose_node = rose_node->next; + } + + if (rose_node != NULL) + goto out; + + if ((rose_node = kmalloc(sizeof(*rose_node), GFP_ATOMIC)) == NULL) { + err = -ENOMEM; + goto out; + } + + rose_node->address = *address; + rose_node->mask = 10; + rose_node->count = 1; + rose_node->loopback = 1; + rose_node->neighbour[0] = rose_loopback_neigh; + + /* Insert at the head of list. Address is always mask=10 */ + rose_node->next = rose_node_list; + rose_node_list = rose_node; + + rose_loopback_neigh->count++; + +out: + spin_unlock_bh(&rose_node_list_lock); + + return err; +} + +/* + * Delete a loopback node. + */ +void rose_del_loopback_node(const rose_address *address) +{ + struct rose_node *rose_node; + + spin_lock_bh(&rose_node_list_lock); + + rose_node = rose_node_list; + while (rose_node != NULL) { + if ((rose_node->mask == 10) && + (rosecmpm(address, &rose_node->address, 10) == 0) && + rose_node->loopback) + break; + rose_node = rose_node->next; + } + + if (rose_node == NULL) + goto out; + + rose_remove_node(rose_node); + + rose_loopback_neigh->count--; + +out: + spin_unlock_bh(&rose_node_list_lock); +} + +/* + * A device has been removed. Remove its routes and neighbours. + */ +void rose_rt_device_down(struct net_device *dev) +{ + struct rose_neigh *s, *rose_neigh; + struct rose_node *t, *rose_node; + int i; + + spin_lock_bh(&rose_node_list_lock); + spin_lock_bh(&rose_neigh_list_lock); + rose_neigh = rose_neigh_list; + while (rose_neigh != NULL) { + s = rose_neigh; + rose_neigh = rose_neigh->next; + + if (s->dev != dev) + continue; + + rose_node = rose_node_list; + + while (rose_node != NULL) { + t = rose_node; + rose_node = rose_node->next; + + for (i = 0; i < t->count; i++) { + if (t->neighbour[i] != s) + continue; + + t->count--; + + switch (i) { + case 0: + t->neighbour[0] = t->neighbour[1]; + fallthrough; + case 1: + t->neighbour[1] = t->neighbour[2]; + break; + case 2: + break; + } + } + + if (t->count <= 0) + rose_remove_node(t); + } + + rose_remove_neigh(s); + } + spin_unlock_bh(&rose_neigh_list_lock); + spin_unlock_bh(&rose_node_list_lock); +} + +#if 0 /* Currently unused */ +/* + * A device has been removed. Remove its links. + */ +void rose_route_device_down(struct net_device *dev) +{ + struct rose_route *s, *rose_route; + + spin_lock_bh(&rose_route_list_lock); + rose_route = rose_route_list; + while (rose_route != NULL) { + s = rose_route; + rose_route = rose_route->next; + + if (s->neigh1->dev == dev || s->neigh2->dev == dev) + rose_remove_route(s); + } + spin_unlock_bh(&rose_route_list_lock); +} +#endif + +/* + * Clear all nodes and neighbours out, except for neighbours with + * active connections going through them. + * Do not clear loopback neighbour and nodes. + */ +static int rose_clear_routes(void) +{ + struct rose_neigh *s, *rose_neigh; + struct rose_node *t, *rose_node; + + spin_lock_bh(&rose_node_list_lock); + spin_lock_bh(&rose_neigh_list_lock); + + rose_neigh = rose_neigh_list; + rose_node = rose_node_list; + + while (rose_node != NULL) { + t = rose_node; + rose_node = rose_node->next; + if (!t->loopback) + rose_remove_node(t); + } + + while (rose_neigh != NULL) { + s = rose_neigh; + rose_neigh = rose_neigh->next; + + if (s->use == 0 && !s->loopback) { + s->count = 0; + rose_remove_neigh(s); + } + } + + spin_unlock_bh(&rose_neigh_list_lock); + spin_unlock_bh(&rose_node_list_lock); + + return 0; +} + +/* + * Check that the device given is a valid AX.25 interface that is "up". + * called with RTNL + */ +static struct net_device *rose_ax25_dev_find(char *devname) +{ + struct net_device *dev; + + if ((dev = __dev_get_by_name(&init_net, devname)) == NULL) + return NULL; + + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) + return dev; + + return NULL; +} + +/* + * Find the first active ROSE device, usually "rose0". + */ +struct net_device *rose_dev_first(void) +{ + struct net_device *dev, *first = NULL; + + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE) + if (first == NULL || strncmp(dev->name, first->name, 3) < 0) + first = dev; + } + if (first) + dev_hold(first); + rcu_read_unlock(); + + return first; +} + +/* + * Find the ROSE device for the given address. + */ +struct net_device *rose_dev_get(rose_address *addr) +{ + struct net_device *dev; + + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && + rosecmp(addr, (const rose_address *)dev->dev_addr) == 0) { + dev_hold(dev); + goto out; + } + } + dev = NULL; +out: + rcu_read_unlock(); + return dev; +} + +static int rose_dev_exists(rose_address *addr) +{ + struct net_device *dev; + + rcu_read_lock(); + for_each_netdev_rcu(&init_net, dev) { + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_ROSE && + rosecmp(addr, (const rose_address *)dev->dev_addr) == 0) + goto out; + } + dev = NULL; +out: + rcu_read_unlock(); + return dev != NULL; +} + + + + +struct rose_route *rose_route_free_lci(unsigned int lci, struct rose_neigh *neigh) +{ + struct rose_route *rose_route; + + for (rose_route = rose_route_list; rose_route != NULL; rose_route = rose_route->next) + if ((rose_route->neigh1 == neigh && rose_route->lci1 == lci) || + (rose_route->neigh2 == neigh && rose_route->lci2 == lci)) + return rose_route; + + return NULL; +} + +/* + * Find a neighbour or a route given a ROSE address. + */ +struct rose_neigh *rose_get_neigh(rose_address *addr, unsigned char *cause, + unsigned char *diagnostic, int route_frame) +{ + struct rose_neigh *res = NULL; + struct rose_node *node; + int failed = 0; + int i; + + if (!route_frame) spin_lock_bh(&rose_node_list_lock); + for (node = rose_node_list; node != NULL; node = node->next) { + if (rosecmpm(addr, &node->address, node->mask) == 0) { + for (i = 0; i < node->count; i++) { + if (node->neighbour[i]->restarted) { + res = node->neighbour[i]; + goto out; + } + } + } + } + if (!route_frame) { /* connect request */ + for (node = rose_node_list; node != NULL; node = node->next) { + if (rosecmpm(addr, &node->address, node->mask) == 0) { + for (i = 0; i < node->count; i++) { + if (!rose_ftimer_running(node->neighbour[i])) { + res = node->neighbour[i]; + goto out; + } + failed = 1; + } + } + } + } + + if (failed) { + *cause = ROSE_OUT_OF_ORDER; + *diagnostic = 0; + } else { + *cause = ROSE_NOT_OBTAINABLE; + *diagnostic = 0; + } + +out: + if (!route_frame) spin_unlock_bh(&rose_node_list_lock); + return res; +} + +/* + * Handle the ioctls that control the routing functions. + */ +int rose_rt_ioctl(unsigned int cmd, void __user *arg) +{ + struct rose_route_struct rose_route; + struct net_device *dev; + int err; + + switch (cmd) { + case SIOCADDRT: + if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) + return -EFAULT; + if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) + return -EINVAL; + if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */ + return -EINVAL; + if (rose_route.mask > 10) /* Mask can't be more than 10 digits */ + return -EINVAL; + if (rose_route.ndigis > AX25_MAX_DIGIS) + return -EINVAL; + err = rose_add_node(&rose_route, dev); + return err; + + case SIOCDELRT: + if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct))) + return -EFAULT; + if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL) + return -EINVAL; + err = rose_del_node(&rose_route, dev); + return err; + + case SIOCRSCLRRT: + return rose_clear_routes(); + + default: + return -EINVAL; + } + + return 0; +} + +static void rose_del_route_by_neigh(struct rose_neigh *rose_neigh) +{ + struct rose_route *rose_route, *s; + + rose_neigh->restarted = 0; + + rose_stop_t0timer(rose_neigh); + rose_start_ftimer(rose_neigh); + + skb_queue_purge(&rose_neigh->queue); + + spin_lock_bh(&rose_route_list_lock); + + rose_route = rose_route_list; + + while (rose_route != NULL) { + if ((rose_route->neigh1 == rose_neigh && rose_route->neigh2 == rose_neigh) || + (rose_route->neigh1 == rose_neigh && rose_route->neigh2 == NULL) || + (rose_route->neigh2 == rose_neigh && rose_route->neigh1 == NULL)) { + s = rose_route->next; + rose_remove_route(rose_route); + rose_route = s; + continue; + } + + if (rose_route->neigh1 == rose_neigh) { + rose_route->neigh1->use--; + rose_route->neigh1 = NULL; + rose_transmit_clear_request(rose_route->neigh2, rose_route->lci2, ROSE_OUT_OF_ORDER, 0); + } + + if (rose_route->neigh2 == rose_neigh) { + rose_route->neigh2->use--; + rose_route->neigh2 = NULL; + rose_transmit_clear_request(rose_route->neigh1, rose_route->lci1, ROSE_OUT_OF_ORDER, 0); + } + + rose_route = rose_route->next; + } + spin_unlock_bh(&rose_route_list_lock); +} + +/* + * A level 2 link has timed out, therefore it appears to be a poor link, + * then don't use that neighbour until it is reset. Blow away all through + * routes and connections using this route. + */ +void rose_link_failed(ax25_cb *ax25, int reason) +{ + struct rose_neigh *rose_neigh; + + spin_lock_bh(&rose_neigh_list_lock); + rose_neigh = rose_neigh_list; + while (rose_neigh != NULL) { + if (rose_neigh->ax25 == ax25) + break; + rose_neigh = rose_neigh->next; + } + + if (rose_neigh != NULL) { + rose_neigh->ax25 = NULL; + ax25_cb_put(ax25); + + rose_del_route_by_neigh(rose_neigh); + rose_kill_by_neigh(rose_neigh); + } + spin_unlock_bh(&rose_neigh_list_lock); +} + +/* + * A device has been "downed" remove its link status. Blow away all + * through routes and connections that use this device. + */ +void rose_link_device_down(struct net_device *dev) +{ + struct rose_neigh *rose_neigh; + + for (rose_neigh = rose_neigh_list; rose_neigh != NULL; rose_neigh = rose_neigh->next) { + if (rose_neigh->dev == dev) { + rose_del_route_by_neigh(rose_neigh); + rose_kill_by_neigh(rose_neigh); + } + } +} + +/* + * Route a frame to an appropriate AX.25 connection. + * A NULL ax25_cb indicates an internally generated frame. + */ +int rose_route_frame(struct sk_buff *skb, ax25_cb *ax25) +{ + struct rose_neigh *rose_neigh, *new_neigh; + struct rose_route *rose_route; + struct rose_facilities_struct facilities; + rose_address *src_addr, *dest_addr; + struct sock *sk; + unsigned short frametype; + unsigned int lci, new_lci; + unsigned char cause, diagnostic; + struct net_device *dev; + int res = 0; + char buf[11]; + + if (skb->len < ROSE_MIN_LEN) + return res; + + if (!ax25) + return rose_loopback_queue(skb, NULL); + + frametype = skb->data[2]; + lci = ((skb->data[0] << 8) & 0xF00) + ((skb->data[1] << 0) & 0x0FF); + if (frametype == ROSE_CALL_REQUEST && + (skb->len <= ROSE_CALL_REQ_FACILITIES_OFF || + skb->data[ROSE_CALL_REQ_ADDR_LEN_OFF] != + ROSE_CALL_REQ_ADDR_LEN_VAL)) + return res; + src_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_SRC_ADDR_OFF); + dest_addr = (rose_address *)(skb->data + ROSE_CALL_REQ_DEST_ADDR_OFF); + + spin_lock_bh(&rose_neigh_list_lock); + spin_lock_bh(&rose_route_list_lock); + + rose_neigh = rose_neigh_list; + while (rose_neigh != NULL) { + if (ax25cmp(&ax25->dest_addr, &rose_neigh->callsign) == 0 && + ax25->ax25_dev->dev == rose_neigh->dev) + break; + rose_neigh = rose_neigh->next; + } + + if (rose_neigh == NULL) { + printk("rose_route : unknown neighbour or device %s\n", + ax2asc(buf, &ax25->dest_addr)); + goto out; + } + + /* + * Obviously the link is working, halt the ftimer. + */ + rose_stop_ftimer(rose_neigh); + + /* + * LCI of zero is always for us, and its always a restart + * frame. + */ + if (lci == 0) { + rose_link_rx_restart(skb, rose_neigh, frametype); + goto out; + } + + /* + * Find an existing socket. + */ + if ((sk = rose_find_socket(lci, rose_neigh)) != NULL) { + if (frametype == ROSE_CALL_REQUEST) { + struct rose_sock *rose = rose_sk(sk); + + /* Remove an existing unused socket */ + rose_clear_queues(sk); + rose->cause = ROSE_NETWORK_CONGESTION; + rose->diagnostic = 0; + rose->neighbour->use--; + rose->neighbour = NULL; + rose->lci = 0; + rose->state = ROSE_STATE_0; + sk->sk_state = TCP_CLOSE; + sk->sk_err = 0; + sk->sk_shutdown |= SEND_SHUTDOWN; + if (!sock_flag(sk, SOCK_DEAD)) { + sk->sk_state_change(sk); + sock_set_flag(sk, SOCK_DEAD); + } + } + else { + skb_reset_transport_header(skb); + res = rose_process_rx_frame(sk, skb); + goto out; + } + } + + /* + * Is is a Call Request and is it for us ? + */ + if (frametype == ROSE_CALL_REQUEST) + if ((dev = rose_dev_get(dest_addr)) != NULL) { + res = rose_rx_call_request(skb, dev, rose_neigh, lci); + dev_put(dev); + goto out; + } + + if (!sysctl_rose_routing_control) { + rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 0); + goto out; + } + + /* + * Route it to the next in line if we have an entry for it. + */ + rose_route = rose_route_list; + while (rose_route != NULL) { + if (rose_route->lci1 == lci && + rose_route->neigh1 == rose_neigh) { + if (frametype == ROSE_CALL_REQUEST) { + /* F6FBB - Remove an existing unused route */ + rose_remove_route(rose_route); + break; + } else if (rose_route->neigh2 != NULL) { + skb->data[0] &= 0xF0; + skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; + skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; + rose_transmit_link(skb, rose_route->neigh2); + if (frametype == ROSE_CLEAR_CONFIRMATION) + rose_remove_route(rose_route); + res = 1; + goto out; + } else { + if (frametype == ROSE_CLEAR_CONFIRMATION) + rose_remove_route(rose_route); + goto out; + } + } + if (rose_route->lci2 == lci && + rose_route->neigh2 == rose_neigh) { + if (frametype == ROSE_CALL_REQUEST) { + /* F6FBB - Remove an existing unused route */ + rose_remove_route(rose_route); + break; + } else if (rose_route->neigh1 != NULL) { + skb->data[0] &= 0xF0; + skb->data[0] |= (rose_route->lci1 >> 8) & 0x0F; + skb->data[1] = (rose_route->lci1 >> 0) & 0xFF; + rose_transmit_link(skb, rose_route->neigh1); + if (frametype == ROSE_CLEAR_CONFIRMATION) + rose_remove_route(rose_route); + res = 1; + goto out; + } else { + if (frametype == ROSE_CLEAR_CONFIRMATION) + rose_remove_route(rose_route); + goto out; + } + } + rose_route = rose_route->next; + } + + /* + * We know that: + * 1. The frame isn't for us, + * 2. It isn't "owned" by any existing route. + */ + if (frametype != ROSE_CALL_REQUEST) { /* XXX */ + res = 0; + goto out; + } + + memset(&facilities, 0x00, sizeof(struct rose_facilities_struct)); + + if (!rose_parse_facilities(skb->data + ROSE_CALL_REQ_FACILITIES_OFF, + skb->len - ROSE_CALL_REQ_FACILITIES_OFF, + &facilities)) { + rose_transmit_clear_request(rose_neigh, lci, ROSE_INVALID_FACILITY, 76); + goto out; + } + + /* + * Check for routing loops. + */ + rose_route = rose_route_list; + while (rose_route != NULL) { + if (rose_route->rand == facilities.rand && + rosecmp(src_addr, &rose_route->src_addr) == 0 && + ax25cmp(&facilities.dest_call, &rose_route->src_call) == 0 && + ax25cmp(&facilities.source_call, &rose_route->dest_call) == 0) { + rose_transmit_clear_request(rose_neigh, lci, ROSE_NOT_OBTAINABLE, 120); + goto out; + } + rose_route = rose_route->next; + } + + if ((new_neigh = rose_get_neigh(dest_addr, &cause, &diagnostic, 1)) == NULL) { + rose_transmit_clear_request(rose_neigh, lci, cause, diagnostic); + goto out; + } + + if ((new_lci = rose_new_lci(new_neigh)) == 0) { + rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 71); + goto out; + } + + if ((rose_route = kmalloc(sizeof(*rose_route), GFP_ATOMIC)) == NULL) { + rose_transmit_clear_request(rose_neigh, lci, ROSE_NETWORK_CONGESTION, 120); + goto out; + } + + rose_route->lci1 = lci; + rose_route->src_addr = *src_addr; + rose_route->dest_addr = *dest_addr; + rose_route->src_call = facilities.dest_call; + rose_route->dest_call = facilities.source_call; + rose_route->rand = facilities.rand; + rose_route->neigh1 = rose_neigh; + rose_route->lci2 = new_lci; + rose_route->neigh2 = new_neigh; + + rose_route->neigh1->use++; + rose_route->neigh2->use++; + + rose_route->next = rose_route_list; + rose_route_list = rose_route; + + skb->data[0] &= 0xF0; + skb->data[0] |= (rose_route->lci2 >> 8) & 0x0F; + skb->data[1] = (rose_route->lci2 >> 0) & 0xFF; + + rose_transmit_link(skb, rose_route->neigh2); + res = 1; + +out: + spin_unlock_bh(&rose_route_list_lock); + spin_unlock_bh(&rose_neigh_list_lock); + + return res; +} + +#ifdef CONFIG_PROC_FS + +static void *rose_node_start(struct seq_file *seq, loff_t *pos) + __acquires(rose_node_list_lock) +{ + struct rose_node *rose_node; + int i = 1; + + spin_lock_bh(&rose_node_list_lock); + if (*pos == 0) + return SEQ_START_TOKEN; + + for (rose_node = rose_node_list; rose_node && i < *pos; + rose_node = rose_node->next, ++i); + + return (i == *pos) ? rose_node : NULL; +} + +static void *rose_node_next(struct seq_file *seq, void *v, loff_t *pos) +{ + ++*pos; + + return (v == SEQ_START_TOKEN) ? rose_node_list + : ((struct rose_node *)v)->next; +} + +static void rose_node_stop(struct seq_file *seq, void *v) + __releases(rose_node_list_lock) +{ + spin_unlock_bh(&rose_node_list_lock); +} + +static int rose_node_show(struct seq_file *seq, void *v) +{ + char rsbuf[11]; + int i; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, "address mask n neigh neigh neigh\n"); + else { + const struct rose_node *rose_node = v; + seq_printf(seq, "%-10s %04d %d", + rose2asc(rsbuf, &rose_node->address), + rose_node->mask, + rose_node->count); + + for (i = 0; i < rose_node->count; i++) + seq_printf(seq, " %05d", rose_node->neighbour[i]->number); + + seq_puts(seq, "\n"); + } + return 0; +} + +const struct seq_operations rose_node_seqops = { + .start = rose_node_start, + .next = rose_node_next, + .stop = rose_node_stop, + .show = rose_node_show, +}; + +static void *rose_neigh_start(struct seq_file *seq, loff_t *pos) + __acquires(rose_neigh_list_lock) +{ + struct rose_neigh *rose_neigh; + int i = 1; + + spin_lock_bh(&rose_neigh_list_lock); + if (*pos == 0) + return SEQ_START_TOKEN; + + for (rose_neigh = rose_neigh_list; rose_neigh && i < *pos; + rose_neigh = rose_neigh->next, ++i); + + return (i == *pos) ? rose_neigh : NULL; +} + +static void *rose_neigh_next(struct seq_file *seq, void *v, loff_t *pos) +{ + ++*pos; + + return (v == SEQ_START_TOKEN) ? rose_neigh_list + : ((struct rose_neigh *)v)->next; +} + +static void rose_neigh_stop(struct seq_file *seq, void *v) + __releases(rose_neigh_list_lock) +{ + spin_unlock_bh(&rose_neigh_list_lock); +} + +static int rose_neigh_show(struct seq_file *seq, void *v) +{ + char buf[11]; + int i; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, + "addr callsign dev count use mode restart t0 tf digipeaters\n"); + else { + struct rose_neigh *rose_neigh = v; + + /* if (!rose_neigh->loopback) { */ + seq_printf(seq, "%05d %-9s %-4s %3d %3d %3s %3s %3lu %3lu", + rose_neigh->number, + (rose_neigh->loopback) ? "RSLOOP-0" : ax2asc(buf, &rose_neigh->callsign), + rose_neigh->dev ? rose_neigh->dev->name : "???", + rose_neigh->count, + rose_neigh->use, + (rose_neigh->dce_mode) ? "DCE" : "DTE", + (rose_neigh->restarted) ? "yes" : "no", + ax25_display_timer(&rose_neigh->t0timer) / HZ, + ax25_display_timer(&rose_neigh->ftimer) / HZ); + + if (rose_neigh->digipeat != NULL) { + for (i = 0; i < rose_neigh->digipeat->ndigi; i++) + seq_printf(seq, " %s", ax2asc(buf, &rose_neigh->digipeat->calls[i])); + } + + seq_puts(seq, "\n"); + } + return 0; +} + + +const struct seq_operations rose_neigh_seqops = { + .start = rose_neigh_start, + .next = rose_neigh_next, + .stop = rose_neigh_stop, + .show = rose_neigh_show, +}; + +static void *rose_route_start(struct seq_file *seq, loff_t *pos) + __acquires(rose_route_list_lock) +{ + struct rose_route *rose_route; + int i = 1; + + spin_lock_bh(&rose_route_list_lock); + if (*pos == 0) + return SEQ_START_TOKEN; + + for (rose_route = rose_route_list; rose_route && i < *pos; + rose_route = rose_route->next, ++i); + + return (i == *pos) ? rose_route : NULL; +} + +static void *rose_route_next(struct seq_file *seq, void *v, loff_t *pos) +{ + ++*pos; + + return (v == SEQ_START_TOKEN) ? rose_route_list + : ((struct rose_route *)v)->next; +} + +static void rose_route_stop(struct seq_file *seq, void *v) + __releases(rose_route_list_lock) +{ + spin_unlock_bh(&rose_route_list_lock); +} + +static int rose_route_show(struct seq_file *seq, void *v) +{ + char buf[11], rsbuf[11]; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, + "lci address callsign neigh <-> lci address callsign neigh\n"); + else { + struct rose_route *rose_route = v; + + if (rose_route->neigh1) + seq_printf(seq, + "%3.3X %-10s %-9s %05d ", + rose_route->lci1, + rose2asc(rsbuf, &rose_route->src_addr), + ax2asc(buf, &rose_route->src_call), + rose_route->neigh1->number); + else + seq_puts(seq, + "000 * * 00000 "); + + if (rose_route->neigh2) + seq_printf(seq, + "%3.3X %-10s %-9s %05d\n", + rose_route->lci2, + rose2asc(rsbuf, &rose_route->dest_addr), + ax2asc(buf, &rose_route->dest_call), + rose_route->neigh2->number); + else + seq_puts(seq, + "000 * * 00000\n"); + } + return 0; +} + +struct seq_operations rose_route_seqops = { + .start = rose_route_start, + .next = rose_route_next, + .stop = rose_route_stop, + .show = rose_route_show, +}; +#endif /* CONFIG_PROC_FS */ + +/* + * Release all memory associated with ROSE routing structures. + */ +void __exit rose_rt_free(void) +{ + struct rose_neigh *s, *rose_neigh = rose_neigh_list; + struct rose_node *t, *rose_node = rose_node_list; + struct rose_route *u, *rose_route = rose_route_list; + + while (rose_neigh != NULL) { + s = rose_neigh; + rose_neigh = rose_neigh->next; + + rose_remove_neigh(s); + } + + while (rose_node != NULL) { + t = rose_node; + rose_node = rose_node->next; + + rose_remove_node(t); + } + + while (rose_route != NULL) { + u = rose_route; + rose_route = rose_route->next; + + rose_remove_route(u); + } +} |