diff options
Diffstat (limited to 'net/netrom/nr_route.c')
| -rw-r--r-- | net/netrom/nr_route.c | 1041 |
1 files changed, 1041 insertions, 0 deletions
diff --git a/net/netrom/nr_route.c b/net/netrom/nr_route.c new file mode 100644 index 0000000..7a86b36 --- /dev/null +++ b/net/netrom/nr_route.c @@ -0,0 +1,1041 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * Copyright Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk) + * Copyright Alan Cox GW4PTS (alan@lxorguk.ukuu.org.uk) + * Copyright Tomi Manninen OH2BNS (oh2bns@sral.fi) + */ +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/socket.h> +#include <linux/in.h> +#include <linux/kernel.h> +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/string.h> +#include <linux/sockios.h> +#include <linux/net.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 <asm/uaccess.h> +#include <asm/system.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/netfilter.h> +#include <linux/init.h> +#include <linux/spinlock.h> +#include <net/netrom.h> +#include <linux/seq_file.h> + +static unsigned int nr_neigh_no = 1; + +static HLIST_HEAD(nr_node_list); +static DEFINE_SPINLOCK(nr_node_list_lock); +static HLIST_HEAD(nr_neigh_list); +static DEFINE_SPINLOCK(nr_neigh_list_lock); + +static struct nr_node *nr_node_get(ax25_address *callsign) +{ + struct nr_node *found = NULL; + struct nr_node *nr_node; + struct hlist_node *node; + + spin_lock_bh(&nr_node_list_lock); + nr_node_for_each(nr_node, node, &nr_node_list) + if (ax25cmp(callsign, &nr_node->callsign) == 0) { + nr_node_hold(nr_node); + found = nr_node; + break; + } + spin_unlock_bh(&nr_node_list_lock); + return found; +} + +static struct nr_neigh *nr_neigh_get_dev(ax25_address *callsign, + struct net_device *dev) +{ + struct nr_neigh *found = NULL; + struct nr_neigh *nr_neigh; + struct hlist_node *node; + + spin_lock_bh(&nr_neigh_list_lock); + nr_neigh_for_each(nr_neigh, node, &nr_neigh_list) + if (ax25cmp(callsign, &nr_neigh->callsign) == 0 && + nr_neigh->dev == dev) { + nr_neigh_hold(nr_neigh); + found = nr_neigh; + break; + } + spin_unlock_bh(&nr_neigh_list_lock); + return found; +} + +static void nr_remove_neigh(struct nr_neigh *); + +/* + * Add a new route to a node, and in the process add the node and the + * neighbour if it is new. + */ +static int nr_add_node(ax25_address *nr, const char *mnemonic, ax25_address *ax25, + ax25_digi *ax25_digi, struct net_device *dev, int quality, int obs_count) +{ + struct nr_node *nr_node; + struct nr_neigh *nr_neigh; + struct nr_route nr_route; + int i, found; + struct net_device *odev; + + if ((odev=nr_dev_get(nr)) != NULL) { /* Can't add routes to ourself */ + dev_put(odev); + return -EINVAL; + } + + nr_node = nr_node_get(nr); + + nr_neigh = nr_neigh_get_dev(ax25, dev); + + /* + * The L2 link to a neighbour has failed in the past + * and now a frame comes from this neighbour. We assume + * it was a temporary trouble with the link and reset the + * routes now (and not wait for a node broadcast). + */ + if (nr_neigh != NULL && nr_neigh->failed != 0 && quality == 0) { + struct nr_node *nr_nodet; + struct hlist_node *node; + + spin_lock_bh(&nr_node_list_lock); + nr_node_for_each(nr_nodet, node, &nr_node_list) { + nr_node_lock(nr_nodet); + for (i = 0; i < nr_nodet->count; i++) + if (nr_nodet->routes[i].neighbour == nr_neigh) + if (i < nr_nodet->which) + nr_nodet->which = i; + nr_node_unlock(nr_nodet); + } + spin_unlock_bh(&nr_node_list_lock); + } + + if (nr_neigh != NULL) + nr_neigh->failed = 0; + + if (quality == 0 && nr_neigh != NULL && nr_node != NULL) { + nr_neigh_put(nr_neigh); + nr_node_put(nr_node); + return 0; + } + + if (nr_neigh == NULL) { + if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL) { + if (nr_node) + nr_node_put(nr_node); + return -ENOMEM; + } + + nr_neigh->callsign = *ax25; + nr_neigh->digipeat = NULL; + nr_neigh->ax25 = NULL; + nr_neigh->dev = dev; + nr_neigh->quality = sysctl_netrom_default_path_quality; + nr_neigh->locked = 0; + nr_neigh->count = 0; + nr_neigh->number = nr_neigh_no++; + nr_neigh->failed = 0; + atomic_set(&nr_neigh->refcount, 1); + + if (ax25_digi != NULL && ax25_digi->ndigi > 0) { + if ((nr_neigh->digipeat = kmalloc(sizeof(*ax25_digi), GFP_KERNEL)) == NULL) { + kfree(nr_neigh); + if (nr_node) + nr_node_put(nr_node); + return -ENOMEM; + } + memcpy(nr_neigh->digipeat, ax25_digi, + sizeof(*ax25_digi)); + } + + spin_lock_bh(&nr_neigh_list_lock); + hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list); + nr_neigh_hold(nr_neigh); + spin_unlock_bh(&nr_neigh_list_lock); + } + + if (quality != 0 && ax25cmp(nr, ax25) == 0 && !nr_neigh->locked) + nr_neigh->quality = quality; + + if (nr_node == NULL) { + if ((nr_node = kmalloc(sizeof(*nr_node), GFP_ATOMIC)) == NULL) { + if (nr_neigh) + nr_neigh_put(nr_neigh); + return -ENOMEM; + } + + nr_node->callsign = *nr; + strcpy(nr_node->mnemonic, mnemonic); + + nr_node->which = 0; + nr_node->count = 1; + atomic_set(&nr_node->refcount, 1); + spin_lock_init(&nr_node->node_lock); + + nr_node->routes[0].quality = quality; + nr_node->routes[0].obs_count = obs_count; + nr_node->routes[0].neighbour = nr_neigh; + + nr_neigh_hold(nr_neigh); + nr_neigh->count++; + + spin_lock_bh(&nr_node_list_lock); + hlist_add_head(&nr_node->node_node, &nr_node_list); + /* refcount initialized at 1 */ + spin_unlock_bh(&nr_node_list_lock); + + return 0; + } + nr_node_lock(nr_node); + + if (quality != 0) + strcpy(nr_node->mnemonic, mnemonic); + + for (found = 0, i = 0; i < nr_node->count; i++) { + if (nr_node->routes[i].neighbour == nr_neigh) { + nr_node->routes[i].quality = quality; + nr_node->routes[i].obs_count = obs_count; + found = 1; + break; + } + } + + if (!found) { + /* We have space at the bottom, slot it in */ + if (nr_node->count < 3) { + nr_node->routes[2] = nr_node->routes[1]; + nr_node->routes[1] = nr_node->routes[0]; + + nr_node->routes[0].quality = quality; + nr_node->routes[0].obs_count = obs_count; + nr_node->routes[0].neighbour = nr_neigh; + + nr_node->which++; + nr_node->count++; + nr_neigh_hold(nr_neigh); + nr_neigh->count++; + } else { + /* It must be better than the worst */ + if (quality > nr_node->routes[2].quality) { + nr_node->routes[2].neighbour->count--; + nr_neigh_put(nr_node->routes[2].neighbour); + + if (nr_node->routes[2].neighbour->count == 0 && !nr_node->routes[2].neighbour->locked) + nr_remove_neigh(nr_node->routes[2].neighbour); + + nr_node->routes[2].quality = quality; + nr_node->routes[2].obs_count = obs_count; + nr_node->routes[2].neighbour = nr_neigh; + + nr_neigh_hold(nr_neigh); + nr_neigh->count++; + } + } + } + + /* Now re-sort the routes in quality order */ + switch (nr_node->count) { + case 3: + if (nr_node->routes[1].quality > nr_node->routes[0].quality) { + switch (nr_node->which) { + case 0: nr_node->which = 1; break; + case 1: nr_node->which = 0; break; + default: break; + } + nr_route = nr_node->routes[0]; + nr_node->routes[0] = nr_node->routes[1]; + nr_node->routes[1] = nr_route; + } + if (nr_node->routes[2].quality > nr_node->routes[1].quality) { + switch (nr_node->which) { + case 1: nr_node->which = 2; + break; + + case 2: nr_node->which = 1; + break; + + default: + break; + } + nr_route = nr_node->routes[1]; + nr_node->routes[1] = nr_node->routes[2]; + nr_node->routes[2] = nr_route; + } + case 2: + if (nr_node->routes[1].quality > nr_node->routes[0].quality) { + switch (nr_node->which) { + case 0: nr_node->which = 1; + break; + + case 1: nr_node->which = 0; + break; + + default: break; + } + nr_route = nr_node->routes[0]; + nr_node->routes[0] = nr_node->routes[1]; + nr_node->routes[1] = nr_route; + } + case 1: + break; + } + + for (i = 0; i < nr_node->count; i++) { + if (nr_node->routes[i].neighbour == nr_neigh) { + if (i < nr_node->which) + nr_node->which = i; + break; + } + } + + nr_neigh_put(nr_neigh); + nr_node_unlock(nr_node); + nr_node_put(nr_node); + return 0; +} + +static inline void __nr_remove_node(struct nr_node *nr_node) +{ + hlist_del_init(&nr_node->node_node); + nr_node_put(nr_node); +} + +#define nr_remove_node_locked(__node) \ + __nr_remove_node(__node) + +static void nr_remove_node(struct nr_node *nr_node) +{ + spin_lock_bh(&nr_node_list_lock); + __nr_remove_node(nr_node); + spin_unlock_bh(&nr_node_list_lock); +} + +static inline void __nr_remove_neigh(struct nr_neigh *nr_neigh) +{ + hlist_del_init(&nr_neigh->neigh_node); + nr_neigh_put(nr_neigh); +} + +#define nr_remove_neigh_locked(__neigh) \ + __nr_remove_neigh(__neigh) + +static void nr_remove_neigh(struct nr_neigh *nr_neigh) +{ + spin_lock_bh(&nr_neigh_list_lock); + __nr_remove_neigh(nr_neigh); + spin_unlock_bh(&nr_neigh_list_lock); +} + +/* + * "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 nr_del_node(ax25_address *callsign, ax25_address *neighbour, struct net_device *dev) +{ + struct nr_node *nr_node; + struct nr_neigh *nr_neigh; + int i; + + nr_node = nr_node_get(callsign); + + if (nr_node == NULL) + return -EINVAL; + + nr_neigh = nr_neigh_get_dev(neighbour, dev); + + if (nr_neigh == NULL) { + nr_node_put(nr_node); + return -EINVAL; + } + + nr_node_lock(nr_node); + for (i = 0; i < nr_node->count; i++) { + if (nr_node->routes[i].neighbour == nr_neigh) { + nr_neigh->count--; + nr_neigh_put(nr_neigh); + + if (nr_neigh->count == 0 && !nr_neigh->locked) + nr_remove_neigh(nr_neigh); + nr_neigh_put(nr_neigh); + + nr_node->count--; + + if (nr_node->count == 0) { + nr_remove_node(nr_node); + } else { + switch (i) { + case 0: + nr_node->routes[0] = nr_node->routes[1]; + case 1: + nr_node->routes[1] = nr_node->routes[2]; + case 2: + break; + } + nr_node_put(nr_node); + } + nr_node_unlock(nr_node); + + return 0; + } + } + nr_neigh_put(nr_neigh); + nr_node_unlock(nr_node); + nr_node_put(nr_node); + + return -EINVAL; +} + +/* + * Lock a neighbour with a quality. + */ +static int nr_add_neigh(ax25_address *callsign, ax25_digi *ax25_digi, struct net_device *dev, unsigned int quality) +{ + struct nr_neigh *nr_neigh; + + nr_neigh = nr_neigh_get_dev(callsign, dev); + if (nr_neigh) { + nr_neigh->quality = quality; + nr_neigh->locked = 1; + nr_neigh_put(nr_neigh); + return 0; + } + + if ((nr_neigh = kmalloc(sizeof(*nr_neigh), GFP_ATOMIC)) == NULL) + return -ENOMEM; + + nr_neigh->callsign = *callsign; + nr_neigh->digipeat = NULL; + nr_neigh->ax25 = NULL; + nr_neigh->dev = dev; + nr_neigh->quality = quality; + nr_neigh->locked = 1; + nr_neigh->count = 0; + nr_neigh->number = nr_neigh_no++; + nr_neigh->failed = 0; + atomic_set(&nr_neigh->refcount, 1); + + if (ax25_digi != NULL && ax25_digi->ndigi > 0) { + if ((nr_neigh->digipeat = kmalloc(sizeof(*ax25_digi), GFP_KERNEL)) == NULL) { + kfree(nr_neigh); + return -ENOMEM; + } + memcpy(nr_neigh->digipeat, ax25_digi, sizeof(*ax25_digi)); + } + + spin_lock_bh(&nr_neigh_list_lock); + hlist_add_head(&nr_neigh->neigh_node, &nr_neigh_list); + /* refcount is initialized at 1 */ + spin_unlock_bh(&nr_neigh_list_lock); + + return 0; +} + +/* + * "Delete" a neighbour. The neighbour is only removed if the number + * of nodes that may use it is zero. + */ +static int nr_del_neigh(ax25_address *callsign, struct net_device *dev, unsigned int quality) +{ + struct nr_neigh *nr_neigh; + + nr_neigh = nr_neigh_get_dev(callsign, dev); + + if (nr_neigh == NULL) return -EINVAL; + + nr_neigh->quality = quality; + nr_neigh->locked = 0; + + if (nr_neigh->count == 0) + nr_remove_neigh(nr_neigh); + nr_neigh_put(nr_neigh); + + return 0; +} + +/* + * Decrement the obsolescence count by one. If a route is reduced to a + * count of zero, remove it. Also remove any unlocked neighbours with + * zero nodes routing via it. + */ +static int nr_dec_obs(void) +{ + struct nr_neigh *nr_neigh; + struct nr_node *s; + struct hlist_node *node, *nodet; + int i; + + spin_lock_bh(&nr_node_list_lock); + nr_node_for_each_safe(s, node, nodet, &nr_node_list) { + nr_node_lock(s); + for (i = 0; i < s->count; i++) { + switch (s->routes[i].obs_count) { + case 0: /* A locked entry */ + break; + + case 1: /* From 1 -> 0 */ + nr_neigh = s->routes[i].neighbour; + + nr_neigh->count--; + nr_neigh_put(nr_neigh); + + if (nr_neigh->count == 0 && !nr_neigh->locked) + nr_remove_neigh(nr_neigh); + + s->count--; + + switch (i) { + case 0: + s->routes[0] = s->routes[1]; + case 1: + s->routes[1] = s->routes[2]; + case 2: + break; + } + break; + + default: + s->routes[i].obs_count--; + break; + + } + } + + if (s->count <= 0) + nr_remove_node_locked(s); + nr_node_unlock(s); + } + spin_unlock_bh(&nr_node_list_lock); + + return 0; +} + +/* + * A device has been removed. Remove its routes and neighbours. + */ +void nr_rt_device_down(struct net_device *dev) +{ + struct nr_neigh *s; + struct hlist_node *node, *nodet, *node2, *node2t; + struct nr_node *t; + int i; + + spin_lock_bh(&nr_neigh_list_lock); + nr_neigh_for_each_safe(s, node, nodet, &nr_neigh_list) { + if (s->dev == dev) { + spin_lock_bh(&nr_node_list_lock); + nr_node_for_each_safe(t, node2, node2t, &nr_node_list) { + nr_node_lock(t); + for (i = 0; i < t->count; i++) { + if (t->routes[i].neighbour == s) { + t->count--; + + switch (i) { + case 0: + t->routes[0] = t->routes[1]; + case 1: + t->routes[1] = t->routes[2]; + case 2: + break; + } + } + } + + if (t->count <= 0) + nr_remove_node_locked(t); + nr_node_unlock(t); + } + spin_unlock_bh(&nr_node_list_lock); + + nr_remove_neigh_locked(s); + } + } + spin_unlock_bh(&nr_neigh_list_lock); +} + +/* + * Check that the device given is a valid AX.25 interface that is "up". + * Or a valid ethernet interface with an AX.25 callsign binding. + */ +static struct net_device *nr_ax25_dev_get(char *devname) +{ + struct net_device *dev; + + if ((dev = dev_get_by_name(devname)) == NULL) + return NULL; + + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25) + return dev; + + dev_put(dev); + return NULL; +} + +/* + * Find the first active NET/ROM device, usually "nr0". + */ +struct net_device *nr_dev_first(void) +{ + struct net_device *dev, *first = NULL; + + read_lock(&dev_base_lock); + for (dev = dev_base; dev != NULL; dev = dev->next) { + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM) + if (first == NULL || strncmp(dev->name, first->name, 3) < 0) + first = dev; + } + if (first) + dev_hold(first); + read_unlock(&dev_base_lock); + + return first; +} + +/* + * Find the NET/ROM device for the given callsign. + */ +struct net_device *nr_dev_get(ax25_address *addr) +{ + struct net_device *dev; + + read_lock(&dev_base_lock); + for (dev = dev_base; dev != NULL; dev = dev->next) { + if ((dev->flags & IFF_UP) && dev->type == ARPHRD_NETROM && ax25cmp(addr, (ax25_address *)dev->dev_addr) == 0) { + dev_hold(dev); + goto out; + } + } +out: + read_unlock(&dev_base_lock); + return dev; +} + +static ax25_digi *nr_call_to_digi(int ndigis, ax25_address *digipeaters) +{ + static ax25_digi ax25_digi; + int i; + + if (ndigis == 0) + return NULL; + + for (i = 0; i < ndigis; i++) { + ax25_digi.calls[i] = digipeaters[i]; + ax25_digi.repeated[i] = 0; + } + + ax25_digi.ndigi = ndigis; + ax25_digi.lastrepeat = -1; + + return &ax25_digi; +} + +/* + * Handle the ioctls that control the routing functions. + */ +int nr_rt_ioctl(unsigned int cmd, void __user *arg) +{ + struct nr_route_struct nr_route; + struct net_device *dev; + int ret; + + switch (cmd) { + case SIOCADDRT: + if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct))) + return -EFAULT; + if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL) + return -EINVAL; + if (nr_route.ndigis < 0 || nr_route.ndigis > AX25_MAX_DIGIS) { + dev_put(dev); + return -EINVAL; + } + switch (nr_route.type) { + case NETROM_NODE: + ret = nr_add_node(&nr_route.callsign, + nr_route.mnemonic, + &nr_route.neighbour, + nr_call_to_digi(nr_route.ndigis, nr_route.digipeaters), + dev, nr_route.quality, + nr_route.obs_count); + break; + case NETROM_NEIGH: + ret = nr_add_neigh(&nr_route.callsign, + nr_call_to_digi(nr_route.ndigis, nr_route.digipeaters), + dev, nr_route.quality); + break; + default: + ret = -EINVAL; + } + dev_put(dev); + return ret; + + case SIOCDELRT: + if (copy_from_user(&nr_route, arg, sizeof(struct nr_route_struct))) + return -EFAULT; + if ((dev = nr_ax25_dev_get(nr_route.device)) == NULL) + return -EINVAL; + switch (nr_route.type) { + case NETROM_NODE: + ret = nr_del_node(&nr_route.callsign, + &nr_route.neighbour, dev); + break; + case NETROM_NEIGH: + ret = nr_del_neigh(&nr_route.callsign, + dev, nr_route.quality); + break; + default: + ret = -EINVAL; + } + dev_put(dev); + return ret; + + case SIOCNRDECOBS: + return nr_dec_obs(); + + default: + return -EINVAL; + } + + return 0; +} + +/* + * 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. + */ +void nr_link_failed(ax25_cb *ax25, int reason) +{ + struct nr_neigh *s, *nr_neigh = NULL; + struct hlist_node *node; + struct nr_node *nr_node = NULL; + + spin_lock_bh(&nr_neigh_list_lock); + nr_neigh_for_each(s, node, &nr_neigh_list) + if (s->ax25 == ax25) { + nr_neigh_hold(s); + nr_neigh = s; + break; + } + spin_unlock_bh(&nr_neigh_list_lock); + + if (nr_neigh == NULL) return; + + nr_neigh->ax25 = NULL; + ax25_cb_put(ax25); + + if (++nr_neigh->failed < sysctl_netrom_link_fails_count) { + nr_neigh_put(nr_neigh); + return; + } + spin_lock_bh(&nr_node_list_lock); + nr_node_for_each(nr_node, node, &nr_node_list) + nr_node_lock(nr_node); + if (nr_node->which < nr_node->count && nr_node->routes[nr_node->which].neighbour == nr_neigh) + nr_node->which++; + nr_node_unlock(nr_node); + spin_unlock_bh(&nr_node_list_lock); + nr_neigh_put(nr_neigh); +} + +/* + * Route a frame to an appropriate AX.25 connection. A NULL ax25_cb + * indicates an internally generated frame. + */ +int nr_route_frame(struct sk_buff *skb, ax25_cb *ax25) +{ + ax25_address *nr_src, *nr_dest; + struct nr_neigh *nr_neigh; + struct nr_node *nr_node; + struct net_device *dev; + unsigned char *dptr; + ax25_cb *ax25s; + int ret; + struct sk_buff *skbn; + + + nr_src = (ax25_address *)(skb->data + 0); + nr_dest = (ax25_address *)(skb->data + 7); + + if (ax25 != NULL) + nr_add_node(nr_src, "", &ax25->dest_addr, ax25->digipeat, + ax25->ax25_dev->dev, 0, sysctl_netrom_obsolescence_count_initialiser); + + if ((dev = nr_dev_get(nr_dest)) != NULL) { /* Its for me */ + if (ax25 == NULL) /* Its from me */ + ret = nr_loopback_queue(skb); + else + ret = nr_rx_frame(skb, dev); + dev_put(dev); + return ret; + } + + if (!sysctl_netrom_routing_control && ax25 != NULL) + return 0; + + /* Its Time-To-Live has expired */ + if (skb->data[14] == 1) { + return 0; + } + + nr_node = nr_node_get(nr_dest); + if (nr_node == NULL) + return 0; + nr_node_lock(nr_node); + + if (nr_node->which >= nr_node->count) { + nr_node_unlock(nr_node); + nr_node_put(nr_node); + return 0; + } + + nr_neigh = nr_node->routes[nr_node->which].neighbour; + + if ((dev = nr_dev_first()) == NULL) { + nr_node_unlock(nr_node); + nr_node_put(nr_node); + return 0; + } + + /* We are going to change the netrom headers so we should get our + own skb, we also did not know until now how much header space + we had to reserve... - RXQ */ + if ((skbn=skb_copy_expand(skb, dev->hard_header_len, 0, GFP_ATOMIC)) == NULL) { + nr_node_unlock(nr_node); + nr_node_put(nr_node); + dev_put(dev); + return 0; + } + kfree_skb(skb); + skb=skbn; + skb->data[14]--; + + dptr = skb_push(skb, 1); + *dptr = AX25_P_NETROM; + + ax25s = ax25_send_frame(skb, 256, (ax25_address *)dev->dev_addr, &nr_neigh->callsign, nr_neigh->digipeat, nr_neigh->dev); + if (nr_neigh->ax25 && ax25s) { + /* We were already holding this ax25_cb */ + ax25_cb_put(ax25s); + } + nr_neigh->ax25 = ax25s; + + dev_put(dev); + ret = (nr_neigh->ax25 != NULL); + nr_node_unlock(nr_node); + nr_node_put(nr_node); + return ret; +} + +#ifdef CONFIG_PROC_FS + +static void *nr_node_start(struct seq_file *seq, loff_t *pos) +{ + struct nr_node *nr_node; + struct hlist_node *node; + int i = 1; + + spin_lock_bh(&nr_node_list_lock); + if (*pos == 0) + return SEQ_START_TOKEN; + + nr_node_for_each(nr_node, node, &nr_node_list) { + if (i == *pos) + return nr_node; + ++i; + } + + return NULL; +} + +static void *nr_node_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct hlist_node *node; + ++*pos; + + node = (v == SEQ_START_TOKEN) + ? nr_node_list.first + : ((struct nr_node *)v)->node_node.next; + + return hlist_entry(node, struct nr_node, node_node); +} + +static void nr_node_stop(struct seq_file *seq, void *v) +{ + spin_unlock_bh(&nr_node_list_lock); +} + +static int nr_node_show(struct seq_file *seq, void *v) +{ + int i; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, + "callsign mnemonic w n qual obs neigh qual obs neigh qual obs neigh\n"); + else { + struct nr_node *nr_node = v; + nr_node_lock(nr_node); + seq_printf(seq, "%-9s %-7s %d %d", + ax2asc(&nr_node->callsign), + (nr_node->mnemonic[0] == '\0') ? "*" : nr_node->mnemonic, + nr_node->which + 1, + nr_node->count); + + for (i = 0; i < nr_node->count; i++) { + seq_printf(seq, " %3d %d %05d", + nr_node->routes[i].quality, + nr_node->routes[i].obs_count, + nr_node->routes[i].neighbour->number); + } + nr_node_unlock(nr_node); + + seq_puts(seq, "\n"); + } + return 0; +} + +static struct seq_operations nr_node_seqops = { + .start = nr_node_start, + .next = nr_node_next, + .stop = nr_node_stop, + .show = nr_node_show, +}; + +static int nr_node_info_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &nr_node_seqops); +} + +struct file_operations nr_nodes_fops = { + .owner = THIS_MODULE, + .open = nr_node_info_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +static void *nr_neigh_start(struct seq_file *seq, loff_t *pos) +{ + struct nr_neigh *nr_neigh; + struct hlist_node *node; + int i = 1; + + spin_lock_bh(&nr_neigh_list_lock); + if (*pos == 0) + return SEQ_START_TOKEN; + + nr_neigh_for_each(nr_neigh, node, &nr_neigh_list) { + if (i == *pos) + return nr_neigh; + } + return NULL; +} + +static void *nr_neigh_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct hlist_node *node; + ++*pos; + + node = (v == SEQ_START_TOKEN) + ? nr_neigh_list.first + : ((struct nr_neigh *)v)->neigh_node.next; + + return hlist_entry(node, struct nr_neigh, neigh_node); +} + +static void nr_neigh_stop(struct seq_file *seq, void *v) +{ + spin_unlock_bh(&nr_neigh_list_lock); +} + +static int nr_neigh_show(struct seq_file *seq, void *v) +{ + int i; + + if (v == SEQ_START_TOKEN) + seq_puts(seq, "addr callsign dev qual lock count failed digipeaters\n"); + else { + struct nr_neigh *nr_neigh = v; + + seq_printf(seq, "%05d %-9s %-4s %3d %d %3d %3d", + nr_neigh->number, + ax2asc(&nr_neigh->callsign), + nr_neigh->dev ? nr_neigh->dev->name : "???", + nr_neigh->quality, + nr_neigh->locked, + nr_neigh->count, + nr_neigh->failed); + + if (nr_neigh->digipeat != NULL) { + for (i = 0; i < nr_neigh->digipeat->ndigi; i++) + seq_printf(seq, " %s", + ax2asc(&nr_neigh->digipeat->calls[i])); + } + + seq_puts(seq, "\n"); + } + return 0; +} + +static struct seq_operations nr_neigh_seqops = { + .start = nr_neigh_start, + .next = nr_neigh_next, + .stop = nr_neigh_stop, + .show = nr_neigh_show, +}; + +static int nr_neigh_info_open(struct inode *inode, struct file *file) +{ + return seq_open(file, &nr_neigh_seqops); +} + +struct file_operations nr_neigh_fops = { + .owner = THIS_MODULE, + .open = nr_neigh_info_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + +#endif + +/* + * Free all memory associated with the nodes and routes lists. + */ +void __exit nr_rt_free(void) +{ + struct nr_neigh *s = NULL; + struct nr_node *t = NULL; + struct hlist_node *node, *nodet; + + spin_lock_bh(&nr_neigh_list_lock); + spin_lock_bh(&nr_node_list_lock); + nr_node_for_each_safe(t, node, nodet, &nr_node_list) { + nr_node_lock(t); + nr_remove_node_locked(t); + nr_node_unlock(t); + } + nr_neigh_for_each_safe(s, node, nodet, &nr_neigh_list) { + while(s->count) { + s->count--; + nr_neigh_put(s); + } + nr_remove_neigh_locked(s); + } + spin_unlock_bh(&nr_node_list_lock); + spin_unlock_bh(&nr_neigh_list_lock); +} |
