685 lines
19 KiB
C
685 lines
19 KiB
C
/*
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* Copyright (C) 2008-2009 B.A.T.M.A.N. contributors:
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*
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* Simon Wunderlich
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of version 2 of the GNU General Public
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* License as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA
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*
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*/
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#include "main.h"
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#include "send.h"
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#include "translation-table.h"
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#include "vis.h"
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#include "soft-interface.h"
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#include "hard-interface.h"
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#include "hash.h"
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/* Returns the smallest signed integer in two's complement with the sizeof x */
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#define smallest_signed_int(x) (1u << (7u + 8u * (sizeof(x) - 1u)))
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/* Checks if a sequence number x is a predecessor/successor of y.
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they handle overflows/underflows and can correctly check for a
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predecessor/successor unless the variable sequence number has grown by
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more then 2**(bitwidth(x)-1)-1.
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This means that for a uint8_t with the maximum value 255, it would think:
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* when adding nothing - it is neither a predecessor nor a successor
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* before adding more than 127 to the starting value - it is a predecessor,
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* when adding 128 - it is neither a predecessor nor a successor,
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* after adding more than 127 to the starting value - it is a successor */
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#define seq_before(x, y) ({typeof(x) _dummy = (x - y); \
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_dummy > smallest_signed_int(_dummy); })
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#define seq_after(x, y) seq_before(y, x)
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struct hashtable_t *vis_hash;
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DEFINE_SPINLOCK(vis_hash_lock);
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static DEFINE_SPINLOCK(recv_list_lock);
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static struct vis_info *my_vis_info;
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static struct list_head send_list; /* always locked with vis_hash_lock */
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static void start_vis_timer(void);
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/* free the info */
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static void free_info(struct kref *ref)
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{
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struct vis_info *info = container_of(ref, struct vis_info, refcount);
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struct recvlist_node *entry, *tmp;
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unsigned long flags;
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list_del_init(&info->send_list);
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spin_lock_irqsave(&recv_list_lock, flags);
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list_for_each_entry_safe(entry, tmp, &info->recv_list, list) {
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list_del(&entry->list);
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kfree(entry);
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}
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spin_unlock_irqrestore(&recv_list_lock, flags);
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kfree(info);
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}
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/* Compare two vis packets, used by the hashing algorithm */
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static int vis_info_cmp(void *data1, void *data2)
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{
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struct vis_info *d1, *d2;
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d1 = data1;
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d2 = data2;
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return compare_orig(d1->packet.vis_orig, d2->packet.vis_orig);
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}
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/* hash function to choose an entry in a hash table of given size */
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/* hash algorithm from http://en.wikipedia.org/wiki/Hash_table */
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static int vis_info_choose(void *data, int size)
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{
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struct vis_info *vis_info = data;
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unsigned char *key;
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uint32_t hash = 0;
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size_t i;
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key = vis_info->packet.vis_orig;
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for (i = 0; i < ETH_ALEN; i++) {
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hash += key[i];
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hash += (hash << 10);
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hash ^= (hash >> 6);
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}
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hash += (hash << 3);
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hash ^= (hash >> 11);
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hash += (hash << 15);
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return hash % size;
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}
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/* insert interface to the list of interfaces of one originator, if it
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* does not already exist in the list */
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void proc_vis_insert_interface(const uint8_t *interface,
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struct hlist_head *if_list,
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bool primary)
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{
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struct if_list_entry *entry;
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struct hlist_node *pos;
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hlist_for_each_entry(entry, pos, if_list, list) {
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if (compare_orig(entry->addr, (void *)interface))
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return;
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}
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/* its a new address, add it to the list */
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entry = kmalloc(sizeof(*entry), GFP_KERNEL);
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if (!entry)
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return;
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memcpy(entry->addr, interface, ETH_ALEN);
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entry->primary = primary;
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hlist_add_head(&entry->list, if_list);
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}
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void proc_vis_read_prim_sec(struct seq_file *seq,
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struct hlist_head *if_list)
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{
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struct if_list_entry *entry;
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struct hlist_node *pos;
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char tmp_addr_str[ETH_STR_LEN];
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hlist_for_each_entry(entry, pos, if_list, list) {
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if (entry->primary)
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seq_printf(seq, "PRIMARY, ");
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else {
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addr_to_string(tmp_addr_str, entry->addr);
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seq_printf(seq, "SEC %s, ", tmp_addr_str);
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}
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}
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}
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/* read an entry */
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void proc_vis_read_entry(struct seq_file *seq,
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struct vis_info_entry *entry,
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uint8_t *src,
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bool primary)
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{
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char to[40];
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addr_to_string(to, entry->dest);
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if (primary && entry->quality == 0)
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seq_printf(seq, "HNA %s, ", to);
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else if (compare_orig(entry->src, src))
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seq_printf(seq, "TQ %s %d, ", to, entry->quality);
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}
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/* add the info packet to the send list, if it was not
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* already linked in. */
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static void send_list_add(struct vis_info *info)
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{
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if (list_empty(&info->send_list)) {
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kref_get(&info->refcount);
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list_add_tail(&info->send_list, &send_list);
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}
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}
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/* delete the info packet from the send list, if it was
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* linked in. */
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static void send_list_del(struct vis_info *info)
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{
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if (!list_empty(&info->send_list)) {
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list_del_init(&info->send_list);
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kref_put(&info->refcount, free_info);
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}
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}
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/* tries to add one entry to the receive list. */
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static void recv_list_add(struct list_head *recv_list, char *mac)
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{
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struct recvlist_node *entry;
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unsigned long flags;
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entry = kmalloc(sizeof(struct recvlist_node), GFP_ATOMIC);
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if (!entry)
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return;
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memcpy(entry->mac, mac, ETH_ALEN);
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spin_lock_irqsave(&recv_list_lock, flags);
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list_add_tail(&entry->list, recv_list);
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spin_unlock_irqrestore(&recv_list_lock, flags);
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}
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/* returns 1 if this mac is in the recv_list */
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static int recv_list_is_in(struct list_head *recv_list, char *mac)
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{
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struct recvlist_node *entry;
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unsigned long flags;
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spin_lock_irqsave(&recv_list_lock, flags);
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list_for_each_entry(entry, recv_list, list) {
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if (memcmp(entry->mac, mac, ETH_ALEN) == 0) {
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spin_unlock_irqrestore(&recv_list_lock, flags);
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return 1;
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}
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}
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spin_unlock_irqrestore(&recv_list_lock, flags);
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return 0;
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}
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/* try to add the packet to the vis_hash. return NULL if invalid (e.g. too old,
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* broken.. ). vis hash must be locked outside. is_new is set when the packet
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* is newer than old entries in the hash. */
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static struct vis_info *add_packet(struct vis_packet *vis_packet,
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int vis_info_len, int *is_new,
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int make_broadcast)
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{
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struct vis_info *info, *old_info;
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struct vis_info search_elem;
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*is_new = 0;
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/* sanity check */
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if (vis_hash == NULL)
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return NULL;
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/* see if the packet is already in vis_hash */
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memcpy(search_elem.packet.vis_orig, vis_packet->vis_orig, ETH_ALEN);
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old_info = hash_find(vis_hash, &search_elem);
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if (old_info != NULL) {
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if (!seq_after(vis_packet->seqno, old_info->packet.seqno)) {
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if (old_info->packet.seqno == vis_packet->seqno) {
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recv_list_add(&old_info->recv_list,
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vis_packet->sender_orig);
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return old_info;
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} else {
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/* newer packet is already in hash. */
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return NULL;
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}
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}
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/* remove old entry */
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hash_remove(vis_hash, old_info);
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send_list_del(old_info);
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kref_put(&old_info->refcount, free_info);
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}
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info = kmalloc(sizeof(struct vis_info) + vis_info_len, GFP_ATOMIC);
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if (info == NULL)
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return NULL;
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kref_init(&info->refcount);
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INIT_LIST_HEAD(&info->send_list);
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INIT_LIST_HEAD(&info->recv_list);
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info->first_seen = jiffies;
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memcpy(&info->packet, vis_packet,
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sizeof(struct vis_packet) + vis_info_len);
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/* initialize and add new packet. */
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*is_new = 1;
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/* Make it a broadcast packet, if required */
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if (make_broadcast)
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memcpy(info->packet.target_orig, broadcastAddr, ETH_ALEN);
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/* repair if entries is longer than packet. */
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if (info->packet.entries * sizeof(struct vis_info_entry) > vis_info_len)
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info->packet.entries = vis_info_len /
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sizeof(struct vis_info_entry);
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recv_list_add(&info->recv_list, info->packet.sender_orig);
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/* try to add it */
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if (hash_add(vis_hash, info) < 0) {
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/* did not work (for some reason) */
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kref_put(&old_info->refcount, free_info);
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info = NULL;
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}
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return info;
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}
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/* handle the server sync packet, forward if needed. */
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void receive_server_sync_packet(struct vis_packet *vis_packet, int vis_info_len)
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{
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struct vis_info *info;
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int is_new, make_broadcast;
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unsigned long flags;
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int vis_server = atomic_read(&vis_mode);
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make_broadcast = (vis_server == VIS_TYPE_SERVER_SYNC);
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spin_lock_irqsave(&vis_hash_lock, flags);
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info = add_packet(vis_packet, vis_info_len, &is_new, make_broadcast);
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if (info == NULL)
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goto end;
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/* only if we are server ourselves and packet is newer than the one in
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* hash.*/
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if (vis_server == VIS_TYPE_SERVER_SYNC && is_new)
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send_list_add(info);
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end:
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spin_unlock_irqrestore(&vis_hash_lock, flags);
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}
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/* handle an incoming client update packet and schedule forward if needed. */
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void receive_client_update_packet(struct vis_packet *vis_packet,
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int vis_info_len)
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{
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struct vis_info *info;
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int is_new;
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unsigned long flags;
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int vis_server = atomic_read(&vis_mode);
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int are_target = 0;
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/* clients shall not broadcast. */
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if (is_bcast(vis_packet->target_orig))
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return;
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/* Are we the target for this VIS packet? */
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if (vis_server == VIS_TYPE_SERVER_SYNC &&
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is_my_mac(vis_packet->target_orig))
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are_target = 1;
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spin_lock_irqsave(&vis_hash_lock, flags);
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info = add_packet(vis_packet, vis_info_len, &is_new, are_target);
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if (info == NULL)
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goto end;
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/* note that outdated packets will be dropped at this point. */
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/* send only if we're the target server or ... */
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if (are_target && is_new) {
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info->packet.vis_type = VIS_TYPE_SERVER_SYNC; /* upgrade! */
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send_list_add(info);
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/* ... we're not the recipient (and thus need to forward). */
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} else if (!is_my_mac(info->packet.target_orig)) {
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send_list_add(info);
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}
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end:
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spin_unlock_irqrestore(&vis_hash_lock, flags);
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}
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/* Walk the originators and find the VIS server with the best tq. Set the packet
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* address to its address and return the best_tq.
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*
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* Must be called with the originator hash locked */
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static int find_best_vis_server(struct vis_info *info)
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{
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HASHIT(hashit);
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struct orig_node *orig_node;
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int best_tq = -1;
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while (hash_iterate(orig_hash, &hashit)) {
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orig_node = hashit.bucket->data;
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if ((orig_node != NULL) &&
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(orig_node->router != NULL) &&
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(orig_node->flags & VIS_SERVER) &&
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(orig_node->router->tq_avg > best_tq)) {
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best_tq = orig_node->router->tq_avg;
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memcpy(info->packet.target_orig, orig_node->orig,
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ETH_ALEN);
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}
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}
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return best_tq;
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}
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/* Return true if the vis packet is full. */
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static bool vis_packet_full(struct vis_info *info)
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{
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if (info->packet.entries + 1 >
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(1000 - sizeof(struct vis_info)) / sizeof(struct vis_info_entry))
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return true;
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return false;
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}
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/* generates a packet of own vis data,
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* returns 0 on success, -1 if no packet could be generated */
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static int generate_vis_packet(void)
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{
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HASHIT(hashit_local);
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HASHIT(hashit_global);
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struct orig_node *orig_node;
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struct vis_info *info = (struct vis_info *)my_vis_info;
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struct vis_info_entry *entry, *entry_array;
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struct hna_local_entry *hna_local_entry;
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int best_tq = -1;
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unsigned long flags;
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info->first_seen = jiffies;
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info->packet.vis_type = atomic_read(&vis_mode);
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spin_lock_irqsave(&orig_hash_lock, flags);
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memcpy(info->packet.target_orig, broadcastAddr, ETH_ALEN);
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info->packet.ttl = TTL;
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info->packet.seqno++;
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info->packet.entries = 0;
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if (info->packet.vis_type == VIS_TYPE_CLIENT_UPDATE) {
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best_tq = find_best_vis_server(info);
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if (best_tq < 0) {
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spin_unlock_irqrestore(&orig_hash_lock, flags);
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return -1;
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}
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}
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entry_array = (struct vis_info_entry *)
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((char *)info + sizeof(struct vis_info));
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while (hash_iterate(orig_hash, &hashit_global)) {
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orig_node = hashit_global.bucket->data;
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if (orig_node->router != NULL
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&& compare_orig(orig_node->router->addr,
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orig_node->orig)
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&& orig_node->batman_if
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&& (orig_node->batman_if->if_active == IF_ACTIVE)
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&& orig_node->router->tq_avg > 0) {
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/* fill one entry into buffer. */
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entry = &entry_array[info->packet.entries];
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memcpy(entry->src,
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orig_node->batman_if->net_dev->dev_addr,
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ETH_ALEN);
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memcpy(entry->dest, orig_node->orig, ETH_ALEN);
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entry->quality = orig_node->router->tq_avg;
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info->packet.entries++;
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if (vis_packet_full(info)) {
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spin_unlock_irqrestore(&orig_hash_lock, flags);
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return 0;
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}
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}
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}
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spin_unlock_irqrestore(&orig_hash_lock, flags);
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spin_lock_irqsave(&hna_local_hash_lock, flags);
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while (hash_iterate(hna_local_hash, &hashit_local)) {
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hna_local_entry = hashit_local.bucket->data;
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entry = &entry_array[info->packet.entries];
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memset(entry->src, 0, ETH_ALEN);
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memcpy(entry->dest, hna_local_entry->addr, ETH_ALEN);
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entry->quality = 0; /* 0 means HNA */
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info->packet.entries++;
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if (vis_packet_full(info)) {
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spin_unlock_irqrestore(&hna_local_hash_lock, flags);
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return 0;
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}
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}
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spin_unlock_irqrestore(&hna_local_hash_lock, flags);
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return 0;
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}
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/* free old vis packets. Must be called with this vis_hash_lock
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* held */
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static void purge_vis_packets(void)
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{
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HASHIT(hashit);
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struct vis_info *info;
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while (hash_iterate(vis_hash, &hashit)) {
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info = hashit.bucket->data;
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if (info == my_vis_info) /* never purge own data. */
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continue;
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if (time_after(jiffies,
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info->first_seen + (VIS_TIMEOUT*HZ)/1000)) {
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hash_remove_bucket(vis_hash, &hashit);
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send_list_del(info);
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kref_put(&info->refcount, free_info);
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}
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}
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}
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static void broadcast_vis_packet(struct vis_info *info, int packet_length)
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{
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HASHIT(hashit);
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struct orig_node *orig_node;
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unsigned long flags;
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struct batman_if *batman_if;
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uint8_t dstaddr[ETH_ALEN];
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spin_lock_irqsave(&orig_hash_lock, flags);
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/* send to all routers in range. */
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while (hash_iterate(orig_hash, &hashit)) {
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orig_node = hashit.bucket->data;
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/* if it's a vis server and reachable, send it. */
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if ((!orig_node) || (!orig_node->batman_if) ||
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(!orig_node->router))
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continue;
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if (!(orig_node->flags & VIS_SERVER))
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continue;
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/* don't send it if we already received the packet from
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* this node. */
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if (recv_list_is_in(&info->recv_list, orig_node->orig))
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continue;
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memcpy(info->packet.target_orig, orig_node->orig, ETH_ALEN);
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batman_if = orig_node->batman_if;
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|
memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
|
|
spin_unlock_irqrestore(&orig_hash_lock, flags);
|
|
|
|
send_raw_packet((unsigned char *)&info->packet,
|
|
packet_length, batman_if, dstaddr);
|
|
|
|
spin_lock_irqsave(&orig_hash_lock, flags);
|
|
|
|
}
|
|
spin_unlock_irqrestore(&orig_hash_lock, flags);
|
|
memcpy(info->packet.target_orig, broadcastAddr, ETH_ALEN);
|
|
}
|
|
|
|
static void unicast_vis_packet(struct vis_info *info, int packet_length)
|
|
{
|
|
struct orig_node *orig_node;
|
|
unsigned long flags;
|
|
struct batman_if *batman_if;
|
|
uint8_t dstaddr[ETH_ALEN];
|
|
|
|
spin_lock_irqsave(&orig_hash_lock, flags);
|
|
orig_node = ((struct orig_node *)
|
|
hash_find(orig_hash, info->packet.target_orig));
|
|
|
|
if ((!orig_node) || (!orig_node->batman_if) || (!orig_node->router))
|
|
goto out;
|
|
|
|
/* don't lock while sending the packets ... we therefore
|
|
* copy the required data before sending */
|
|
batman_if = orig_node->batman_if;
|
|
memcpy(dstaddr, orig_node->router->addr, ETH_ALEN);
|
|
spin_unlock_irqrestore(&orig_hash_lock, flags);
|
|
|
|
send_raw_packet((unsigned char *)&info->packet,
|
|
packet_length, batman_if, dstaddr);
|
|
return;
|
|
|
|
out:
|
|
spin_unlock_irqrestore(&orig_hash_lock, flags);
|
|
}
|
|
|
|
/* only send one vis packet. called from send_vis_packets() */
|
|
static void send_vis_packet(struct vis_info *info)
|
|
{
|
|
int packet_length;
|
|
|
|
if (info->packet.ttl < 2) {
|
|
printk(KERN_WARNING "batman-adv: Error - can't send vis packet: ttl exceeded\n");
|
|
return;
|
|
}
|
|
|
|
memcpy(info->packet.sender_orig, mainIfAddr, ETH_ALEN);
|
|
info->packet.ttl--;
|
|
|
|
packet_length = sizeof(struct vis_packet) +
|
|
info->packet.entries * sizeof(struct vis_info_entry);
|
|
|
|
if (is_bcast(info->packet.target_orig))
|
|
broadcast_vis_packet(info, packet_length);
|
|
else
|
|
unicast_vis_packet(info, packet_length);
|
|
info->packet.ttl++; /* restore TTL */
|
|
}
|
|
|
|
/* called from timer; send (and maybe generate) vis packet. */
|
|
static void send_vis_packets(struct work_struct *work)
|
|
{
|
|
struct vis_info *info, *temp;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&vis_hash_lock, flags);
|
|
|
|
purge_vis_packets();
|
|
|
|
if (generate_vis_packet() == 0) {
|
|
/* schedule if generation was successful */
|
|
send_list_add(my_vis_info);
|
|
}
|
|
|
|
list_for_each_entry_safe(info, temp, &send_list, send_list) {
|
|
|
|
kref_get(&info->refcount);
|
|
spin_unlock_irqrestore(&vis_hash_lock, flags);
|
|
|
|
send_vis_packet(info);
|
|
|
|
spin_lock_irqsave(&vis_hash_lock, flags);
|
|
send_list_del(info);
|
|
kref_put(&info->refcount, free_info);
|
|
}
|
|
spin_unlock_irqrestore(&vis_hash_lock, flags);
|
|
start_vis_timer();
|
|
}
|
|
static DECLARE_DELAYED_WORK(vis_timer_wq, send_vis_packets);
|
|
|
|
/* init the vis server. this may only be called when if_list is already
|
|
* initialized (e.g. bat0 is initialized, interfaces have been added) */
|
|
int vis_init(void)
|
|
{
|
|
unsigned long flags;
|
|
if (vis_hash)
|
|
return 1;
|
|
|
|
spin_lock_irqsave(&vis_hash_lock, flags);
|
|
|
|
vis_hash = hash_new(256, vis_info_cmp, vis_info_choose);
|
|
if (!vis_hash) {
|
|
printk(KERN_ERR "batman-adv:Can't initialize vis_hash\n");
|
|
goto err;
|
|
}
|
|
|
|
my_vis_info = kmalloc(1000, GFP_ATOMIC);
|
|
if (!my_vis_info) {
|
|
printk(KERN_ERR "batman-adv:Can't initialize vis packet\n");
|
|
goto err;
|
|
}
|
|
|
|
/* prefill the vis info */
|
|
my_vis_info->first_seen = jiffies - atomic_read(&vis_interval);
|
|
INIT_LIST_HEAD(&my_vis_info->recv_list);
|
|
INIT_LIST_HEAD(&my_vis_info->send_list);
|
|
kref_init(&my_vis_info->refcount);
|
|
my_vis_info->packet.version = COMPAT_VERSION;
|
|
my_vis_info->packet.packet_type = BAT_VIS;
|
|
my_vis_info->packet.ttl = TTL;
|
|
my_vis_info->packet.seqno = 0;
|
|
my_vis_info->packet.entries = 0;
|
|
|
|
INIT_LIST_HEAD(&send_list);
|
|
|
|
memcpy(my_vis_info->packet.vis_orig, mainIfAddr, ETH_ALEN);
|
|
memcpy(my_vis_info->packet.sender_orig, mainIfAddr, ETH_ALEN);
|
|
|
|
if (hash_add(vis_hash, my_vis_info) < 0) {
|
|
printk(KERN_ERR
|
|
"batman-adv:Can't add own vis packet into hash\n");
|
|
/* not in hash, need to remove it manually. */
|
|
kref_put(&my_vis_info->refcount, free_info);
|
|
goto err;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&vis_hash_lock, flags);
|
|
start_vis_timer();
|
|
return 1;
|
|
|
|
err:
|
|
spin_unlock_irqrestore(&vis_hash_lock, flags);
|
|
vis_quit();
|
|
return 0;
|
|
}
|
|
|
|
/* Decrease the reference count on a hash item info */
|
|
static void free_info_ref(void *data)
|
|
{
|
|
struct vis_info *info = data;
|
|
|
|
send_list_del(info);
|
|
kref_put(&info->refcount, free_info);
|
|
}
|
|
|
|
/* shutdown vis-server */
|
|
void vis_quit(void)
|
|
{
|
|
unsigned long flags;
|
|
if (!vis_hash)
|
|
return;
|
|
|
|
cancel_delayed_work_sync(&vis_timer_wq);
|
|
|
|
spin_lock_irqsave(&vis_hash_lock, flags);
|
|
/* properly remove, kill timers ... */
|
|
hash_delete(vis_hash, free_info_ref);
|
|
vis_hash = NULL;
|
|
my_vis_info = NULL;
|
|
spin_unlock_irqrestore(&vis_hash_lock, flags);
|
|
}
|
|
|
|
/* schedule packets for (re)transmission */
|
|
static void start_vis_timer(void)
|
|
{
|
|
queue_delayed_work(bat_event_workqueue, &vis_timer_wq,
|
|
(atomic_read(&vis_interval) * HZ) / 1000);
|
|
}
|