kernel-aodv_v2.2.2.tgz

/*************************************************************************** aodv_route.c - description ------------------- begin : Mon Jul 29 2002 copyright : (C) 2002 by Luke Klein-Berndt email : kleinb@nist.gov ***************************************************************************/ #include "aodv_route.h" aodv_route *aodv_route_table; extern u_int32_t g_broadcast_ip; rwlock_t route_lock = RW_LOCK_UNLOCKED; inline void route_read_lock() { read_lock_bh(&route_lock); } inline void route_read_unlock() { read_unlock_bh(&route_lock); } inline void route_write_lock() { write_lock_bh(&route_lock); } inline void route_write_unlock() { write_unlock_bh(&route_lock); } aodv_route *first_aodv_route() { return aodv_route_table; } int valid_aodv_route(aodv_route * tmp_route) { if (time_after(tmp_route->lifetime, getcurrtime()) && tmp_route->route_valid) { return 1; } else { return 0; } } int init_aodv_route_table(void) { aodv_route *tmp_route; u_int32_t lo; aodv_route_table = NULL; inet_aton("127.0.0.1",&lo); tmp_route = create_aodv_route(lo); tmp_route->next_hop = lo; tmp_route->metric = 0; tmp_route->self_route = TRUE; tmp_route->route_valid = TRUE; tmp_route->seq = 0; return 0; } void expire_aodv_route(aodv_route * tmp_route) { //marks a route as expired tmp_route->lifetime = (getcurrtime() + DELETE_PERIOD); tmp_route->seq++; tmp_route->route_valid = FALSE; } void remove_aodv_route(aodv_route * dead_route) { route_write_lock(); if (aodv_route_table == dead_route) { aodv_route_table = dead_route->next; } if (dead_route->prev != NULL) { dead_route->prev->next = dead_route->next; } if (dead_route->next!=NULL) { dead_route->next->prev = dead_route->prev; } route_write_unlock(); kfree(dead_route); } int cleanup_aodv_route_table() { aodv_route *dead_route, *tmp_route; //route_write_lock(); tmp_route = aodv_route_table; while (tmp_route!=NULL) { delete_kernel_route_entry(tmp_route->ip, tmp_route->next_hop, tmp_route->netmask); dead_route = tmp_route; tmp_route = tmp_route->next; kfree(dead_route); } aodv_route_table = NULL; //route_write_unlock(); return 0; } int flush_aodv_route_table() { u_int64_t currtime = getcurrtime(); aodv_route *dead_route, *tmp_route, *prev_route=NULL; //route_write_lock(); tmp_route = aodv_route_table; while (tmp_route!=NULL) { if (prev_route != tmp_route->prev) { printk("AODV: Routing table error! %s prev is wrong!\n",inet_ntoa(tmp_route->ip)); } prev_route = tmp_route; if (time_before(tmp_route->lifetime, currtime) && (!tmp_route->self_route)) { //printk("looking at route: %s\n",inet_ntoa(tmp_route->ip)); if (tmp_route->route_valid ) { expire_aodv_route(tmp_route); tmp_route = tmp_route->next; } else { delete_kernel_route_entry(tmp_route->ip, tmp_route->next_hop, tmp_route->netmask); dead_route = tmp_route; prev_route = tmp_route->prev; tmp_route = tmp_route->next; route_read_unlock(); remove_aodv_route(dead_route); route_read_lock(); } } else { tmp_route = tmp_route->next; } } // route_write_unlock(); return 0; } int delete_aodv_route(u_int32_t target_ip) { aodv_route *dead_route; route_read_lock(); dead_route = aodv_route_table; while ((dead_route != NULL) && (dead_route->ip <= target_ip)) { if (dead_route->ip == target_ip) { route_read_unlock(); remove_aodv_route(dead_route); return 1; } dead_route = dead_route->next; } route_read_unlock(); return 0; } void insert_aodv_route(aodv_route * new_route) { aodv_route *tmp_route; aodv_route *prev_route = NULL; route_write_lock(); tmp_route = aodv_route_table; while ((tmp_route != NULL) && (tmp_route->ip < new_route->ip)) { prev_route = tmp_route; tmp_route = tmp_route->next; } if (aodv_route_table && (tmp_route == aodv_route_table)) // if it goes in the first spot in the table { aodv_route_table->prev = new_route; new_route->next = aodv_route_table; aodv_route_table = new_route; } if (aodv_route_table == NULL) // if the routing table is empty { aodv_route_table = new_route; } if (prev_route!=NULL) { if (prev_route->next) { prev_route->next->prev = new_route; } new_route->next = prev_route->next; new_route->prev = prev_route; prev_route->next = new_route; } route_write_unlock(); return; } aodv_route *create_aodv_route(uint32_t ip) { aodv_route *tmp_entry; /* Allocate memory for new entry */ if ((tmp_entry = (aodv_route *) kmalloc(sizeof(aodv_route), GFP_ATOMIC)) == NULL) { printk(KERN_WARNING "AODV: Error getting memory for new route\n"); return NULL; } tmp_entry->self_route = FALSE; tmp_entry->rreq_id = 0; tmp_entry->metric = 0; tmp_entry->seq = 0; tmp_entry->ip = ip; tmp_entry->next_hop = ip; tmp_entry->dev = NULL; tmp_entry->route_valid = FALSE; tmp_entry->netmask = g_broadcast_ip; tmp_entry->route_seq_valid = FALSE; tmp_entry->prev = NULL; tmp_entry->next = NULL; if (ip) { insert_aodv_route(tmp_entry); } return tmp_entry; } int update_aodv_route(u_int32_t ip, u_int32_t next_hop_ip, u_int8_t metric, u_int32_t seq, struct net_device *dev) { aodv_route *tmp_route; u_int64_t curr_time; /*lock table */ tmp_route = find_aodv_route(ip); /* Get eprev_route->next->prev = new_route;ntry from RT if there is one */ if (!valid_aodv_neigh(next_hop_ip)) { printk(KERN_INFO "AODV: Failed to update route: %s \n", inet_ntoa(ip)); return 0; } if (tmp_route && seq_greater(tmp_route->seq, seq)) { return 0; } if (tmp_route && tmp_route->route_valid) { if ((seq == tmp_route->seq) && (metric >= tmp_route->metric)) { return 0; } } if (tmp_route == NULL) { tmp_route = create_aodv_route(ip); if (tmp_route == NULL) return -ENOMEM; tmp_route->ip = ip; } if (tmp_route->self_route) { printk("updating a SELF-ROUTE!!! %s hopcount %d\n", inet_ntoa(next_hop_ip), metric); if (!tmp_route->route_valid) printk("because route was invalid!\n"); if (!tmp_route->route_seq_valid) printk("because seq was invalid!\n"); if (seq_greater(seq, tmp_route->seq)) printk("because seq of route was lower!\n"); if ((seq == tmp_route->seq) && (metric < tmp_route->metric)) printk("becase seq same but hop lower!\n"); } /* Update values in the RT entry */ tmp_route->seq = seq; tmp_route->next_hop = next_hop_ip; tmp_route->metric = metric; tmp_route->dev = dev; tmp_route->route_valid = TRUE; tmp_route->route_seq_valid = TRUE; delete_kernel_route_entry(tmp_route->ip, tmp_route->next_hop, tmp_route->netmask); insert_kernel_route_entry(tmp_route->ip, tmp_route->next_hop, tmp_route->netmask, tmp_route->dev->name); ipq_send_ip(ip); curr_time = getcurrtime(); /* Get current time */ /* Check if the lifetime in RT is valid, if not update it */ tmp_route->lifetime = curr_time + ACTIVE_ROUTE_TIMEOUT;