void pwospf_flood_lsu(struct ip* ip_header, pwospf_header_t* pwospf_header, pwospf_lsu_packet_t* lsu_packet, neighbor_t* sending_neighbor, interface_t* intf) {
printf(" ** pwospf_flood_lsu(..) called\n");
// decrement ttl
uint16_t ttl = 0;
ttl = htons(lsu_packet->ttl);
ttl = ttl - 1;
ttl = ntohs(ttl);
lsu_packet->ttl = ttl;
pwospf_header->checksum = 0;
uint16_t pwospf_packet_len = pwospf_header->len;
// correct order
pwospf_header->len = htons(pwospf_header->len);
// generate raw packet
byte* pwospf_packet = (byte*) malloc_or_die(pwospf_packet_len);
memcpy(pwospf_packet, pwospf_header, sizeof(pwospf_header_t));
memcpy(pwospf_packet + sizeof(pwospf_header_t), lsu_packet, pwospf_packet_len - sizeof(pwospf_header_t));
printf(" ** pwospf_flood_lsu(..) pwospf packet with len %u generated \n", pwospf_packet_len);
// generate checksum
pwospf_header->checksum = htons(htons(inet_chksum((void*) pwospf_packet, pwospf_packet_len)));
memcpy(pwospf_packet, pwospf_header, sizeof(pwospf_header_t));
// check if ttl expired
if(lsu_packet->ttl < 1) {
printf(" ** pwospf_flood_lsu(..) ttl expired, not flooding\n");
} else {
// get instance of router
struct sr_instance* sr_inst = get_sr();
struct sr_router* router = (struct sr_router*)sr_get_subsystem(sr_inst);
node* first = NULL;
neighbor_t* neighbor = NULL;
int i;
// now iterate through each interface
for( i = 0; i < router->num_interfaces ; i++) {
// now iterate this interface's neighbors list
first = router->interface[i].neighbor_list;
pthread_mutex_lock(&router->interface[i].neighbor_lock);
while(first != NULL) {
// get neighbor
neighbor = (neighbor_t*) first->data;
if(neighbor != NULL) {
// ensure that the sending neighbour is excluded
if(neighbor->id != sending_neighbor->id) {
byte* ip_packet = (byte*) malloc_or_die(ip_header->ip_len);
ip_header->ip_dst.s_addr = neighbor->ip;
ip_header->ip_len = htons((ip_header->ip_len));
ip_header->ip_off = htons((ip_header->ip_off));
ip_header->ip_id = htons((ip_header->ip_id));
ip_header->ip_sum = htons((ip_header->ip_sum));
memcpy(ip_packet, ip_header, ip_header->ip_hl * 4);
memcpy(ip_packet + ip_header->ip_hl * 4, pwospf_packet, pwospf_packet_len);
ip_look_up_reply(ip_packet, ip_header, intf);
}
}
first = first->next;
}
pthread_mutex_unlock(&router->interface[i].neighbor_lock);
}
}
}
void ip_look_up_reply(byte* ip_packet, struct ip* ip_header, interface_t* intf) {
printf(" ** ip_lookup_reply(..) called \n");
// get ptr to global router instance
struct sr_router* subsystem = (struct sr_router*)sr_get_subsystem(get_sr());
// get dst ip object
addr_ip_t dst_ip;
memcpy(&dst_ip, &ip_header->ip_dst, 4);
// look up in routing table
route_info_t route_info = rrtable_find_route(subsystem->rtable, dst_ip);
if(route_info.intf == NULL) {
printf(" ** ip_lookup_reply(..) Error! No route found \n");
} else {
// display output interface
printf(" ** ip_lookup_reply(..) output interface for ip: %s\n", quick_ip_to_string(dst_ip));
display_interface(route_info.intf);
// check if destination same as ip of the source interface and packet didn't originate from one of my interfaces
if(strcmp(route_info.intf->name, intf->name) == 0 && check_packet_source(ip_header->ip_src, subsystem) == FALSE) {
printf(" ** make_ip_packet_reply(..) error! destination interface same as source \n");
// send icmp destination host unreachable
uint8_t code = ICMP_TYPE_CODE_DST_UNREACH_HOST;
// reverse order
ip_header->ip_len = ntohs((ip_header->ip_len));
ip_header->ip_off = ntohs((ip_header->ip_off));
ip_header->ip_id = ntohs((ip_header->ip_id));
ip_header->ip_sum = ntohs((ip_header->ip_sum));
uint16_t packet_len = ip_header->ip_len;
icmp_type_dst_unreach_send(&code, ip_packet, &packet_len, ip_header);
} else {
// check if ttl expired
if(ip_header->ip_ttl == 1) {
printf(" ** ip_lookup_reply(..) ttl expired, sending ICMP ttl error message \n");
// reverse order
ip_header->ip_len = ntohs((ip_header->ip_len));
ip_header->ip_off = ntohs((ip_header->ip_off));
ip_header->ip_id = ntohs((ip_header->ip_id));
ip_header->ip_sum = ntohs((ip_header->ip_sum));
uint8_t code = ICMP_TYPE_CODE_TTL_TRANSIT;
uint16_t len = ip_header->ip_len;
icmp_type_ttl_send(&code, ip_packet, &len, ip_header);
} else {
printf(" ** ip_lookup_reply(..) decrementing ttl \n");
// create new ip header
struct ip* ip_header_ttl = (struct ip*) malloc_or_die(ip_header->ip_hl * 4);
memcpy(ip_header_ttl, ip_header, ip_header->ip_hl * 4);
// decrement ttl
ip_header_ttl->ip_ttl = ip_header_ttl->ip_ttl - 1;
// generate checksum
ip_header_ttl->ip_sum = 0;
ip_header_ttl->ip_sum = htons(htons(inet_chksum((void*)ip_header_ttl, ip_header_ttl->ip_hl * 4)));
// get payload
uint16_t payload_len = ntohs(ip_header_ttl->ip_len) - (ip_header_ttl->ip_hl * 4);
printf(" ** ip_lookup_reply(..) Payload size %u bytes \n", payload_len);
memcpy(ip_packet, ip_header_ttl, ip_header_ttl->ip_hl * 4);
// make new ip packet
send_ip_packet(ip_packet, ip_header_ttl, route_info);
}
}
}
}
void sr_integ_init(struct sr_instance* sr)
{
printf(" ** sr_integ_init(..) called \n");
/* Register router state with global instance */
struct sr_router* subsystem = (struct sr_router*)malloc(sizeof(struct sr_router));
assert(subsystem);
sr_set_subsystem(get_sr(), subsystem);
} /* -- sr_integ_init -- */
uint32_t sr_integ_findsrcip(uint32_t dest /* nbo */)
{
/* --
* e.g.
*
* struct sr_instance* sr = sr_get_global_instance();
* struct my_router* mr = (struct my_router*)
* sr_get_subsystem(sr);
* return my_findsrcip(mr, dest);
* -- */
struct sr_router* subsystem = (struct sr_router*)sr_get_subsystem(get_sr());
// look up in routing table
route_info_t route_info = rrtable_find_route(subsystem->rtable, dest);
return route_info.intf->ip;
} /* -- ip_findsrcip -- */
void pwospf_hello_type(struct ip* ip_header, byte* payload, uint16_t payload_len, pwospf_header_t* pwospf_header, interface_t* intf) {
printf(" ** pwospf_hello_type(..) called \n");
printf(" ** pwospf_hello_type(..) packet with length: %u \n", payload_len);
// make hello packet
pwospf_hello_packet_t* hello_packet = (pwospf_hello_packet_t*) malloc_or_die(sizeof(pwospf_hello_packet_t));
memcpy(&hello_packet->network_mask, payload, 4);
memcpy(&hello_packet->helloint, payload + 4, 2);
memcpy(&hello_packet->padding, payload + 6, 2);
// display packet
printf(" ** pwospf_hello_type(..) displayed header contents:\n");
display_hello_packet(hello_packet);
// check mask and hello interval
if(intf->subnet_mask == hello_packet->network_mask && intf->helloint == ntohs(hello_packet->helloint)) {
printf(" ** pwospf_hello_type(..) network mask and hello interval correct\n");
// if the interface has no neighbors
if(intf->neighbor_list == NULL) {
printf(" ** pwospf_hello_type(..) interface has no neighbors, adding new neighbor\n");
add_neighbor(intf, pwospf_header->router_id, ip_header->ip_src.s_addr, hello_packet->helloint, hello_packet->network_mask);
} else { // interface has existing neighbors
// generate neighbor object
neighbor_t* neighbor = make_neighbor(pwospf_header->router_id, ip_header->ip_src.s_addr, hello_packet->helloint, hello_packet->network_mask);
// get last instance so that lsu info can be put back
pthread_mutex_lock(&intf->neighbor_lock);
node* ret = llist_find( intf->neighbor_list, predicate_id_neighbor_t,(void*) &pwospf_header->router_id);
pthread_mutex_unlock(&intf->neighbor_lock);
if( ret!= NULL) {
neighbor_t *neighbor_ret = (neighbor_t*) ret->data;
neighbor->last_adverts = neighbor_ret->last_adverts;
neighbor->last_lsu_packet = neighbor_ret->last_lsu_packet;
}
// lock neighbor list
pthread_mutex_lock(&intf->neighbor_lock);
// if exists, then update, otherwise add
intf->neighbor_list = llist_update_beginning_delete(intf->neighbor_list, predicate_neighbor_t, (void*) neighbor);
pthread_mutex_unlock(&intf->neighbor_lock);
}
// update info in neighbor db
// get instance of router
struct sr_instance* sr_inst = get_sr();
struct sr_router* router = (struct sr_router*)sr_get_subsystem(sr_inst);
update_neighbor_vertex_t_rid(router, ip_header->ip_src.s_addr, pwospf_header->router_id);
} else {
printf(" ** pwospf_hello_type(..) network mask or hello interval incorrect\n");
}
}
void send_ip_packet(byte* ip_packet, struct ip* ip_header, route_info_t route_info) {
printf(" ** send_ip_packet(..) called \n");
// display generated packet len
addr_ip_t dst_ip, src_ip;
memcpy(&dst_ip, &ip_header->ip_dst, 4);
memcpy(&src_ip, &ip_header->ip_src, 4);
if(check_if_local_subnet(dst_ip, src_ip, route_info.intf->subnet_mask) == FALSE) { // non local subnet
printf(" ** send_ip_packet(..) destination on non-local subnet\n");
// check if dst directly connected
if(route_info.ip == 0)
printf(" ** send_ip_packet(..) destination directly connected\n");
else
dst_ip = route_info.ip;
} else
printf(" ** send_ip_packet(..) destination on local subnet\n");
struct sr_router* subsystem = (struct sr_router*)sr_get_subsystem(get_sr());
arp_cache_handle_partial_frame(subsystem, route_info.intf, dst_ip, ip_packet, ntohs(ip_header->ip_len), ETHERTYPE_IP);
}
void ip_look_up(byte* ip_packet, struct ip* ip_header) {
printf(" ** ip_lookup(..) called \n");
// get ptr to global router instance
struct sr_router* subsystem = (struct sr_router*)sr_get_subsystem(get_sr());
// get dst ip object
addr_ip_t dst_ip;
memcpy(&dst_ip, &ip_header->ip_dst, 4);
// look up in routing table
route_info_t route_info = rrtable_find_route(subsystem->rtable, dst_ip);
if(route_info.intf == NULL) {
printf(" ** ip_lookup(..) Error! No route found \n");
} else {
// display output interface
printf(" ** ip_lookup(..) output interface for ip: %s\n", quick_ip_to_string(dst_ip));
display_interface(route_info.intf);
// set src ip as the ip of the output interface
memcpy(&ip_header->ip_src, &route_info.intf->ip, 4);
memcpy(ip_packet, ip_header, ip_header->ip_hl);
// check if ttl expired
if(ip_header->ip_ttl == 1) {
printf(" ** ip_lookup(..) ttl expired, sending ICMP ttl error message \n");
uint8_t code = ICMP_TYPE_CODE_TTL_TRANSIT;
uint16_t len = ntohs(ip_header->ip_len);
icmp_type_ttl_send(&code, ip_packet, &len, ip_header);
} else {
printf(" ** ip_lookup(..) decrementing ttl \n");
// create new ip header
struct ip* ip_header_ttl = (struct ip*) malloc_or_die(ip_header->ip_hl * 4);
memcpy(ip_header_ttl, ip_header, ip_header->ip_hl * 4);
// decrement ttl
ip_header_ttl->ip_ttl = ip_header_ttl->ip_ttl - 1;
// generate checksum
ip_header_ttl->ip_sum = 0;
ip_header_ttl->ip_sum = htons(htons(inet_chksum((void*)ip_header_ttl, ip_header_ttl->ip_hl * 4)));
// get payload
uint16_t payload_len = ntohs(ip_header_ttl->ip_len) - (ip_header_ttl->ip_hl * 4);
printf(" ** ip_lookup(..) Payload size %u bytes \n", payload_len);
memcpy(ip_packet, ip_header_ttl, ip_header_ttl->ip_hl * 4);
// make new ip packet
send_ip_packet(ip_packet, ip_header_ttl, route_info);
}
}
}
static void proc_go(PD *p)
{
struct gouser_stack *sp;
D(("BDOS: xexec - trying to load (and execute) a process on 0x%lx...\n", p->p_tbase));
p->p_parent = run;
/* create a stack at the end of the TPA */
sp = (struct gouser_stack *) (p->p_hitpa - sizeof(struct gouser_stack));
sp->basepage = p; /* the stack contains the basepage */
sp->retaddr = p->p_tbase; /* return address a3 is text start */
sp->sr = get_sr() & 0x0700; /* the process will start in user mode, same IPL */
/* the other stack is the supervisor stack */
sp->other_sp = (long) &supstk[SUPSIZ];
/* store this new stack in the saved a7 field of the PD */
p->p_areg[7-3] = (long) sp;
#if 1
/* the following settings are not documented, and hence theoretically
* the assignments below are not necessary.
* However, many programs test if A0 = 0 to check if they are running
* as a normal program or as an accessory, so we need to clear at least
* this register!
*/
{ /* d1-d7/a0-a2 and dummy return address set to zero */
int i;
for(i = 0; i < 11 ; i++)
sp->fill[i] = 0;
}
p->p_areg[6-3] = (long) sp; /* a6 to hold a copy of the stack */
p->p_areg[5-3] = p->p_dbase; /* a5 to point to the DATA segt */
p->p_areg[4-3] = p->p_bbase; /* a4 to point to the BSS segt */
#endif
/* the new process is the one to run */
run = (PD *) p;
gouser();
}
void sr_integ_init(struct sr_instance* sr)
{
printf(" ** sr_integ_init(..) called \n");
sr_router* subsystem = (sr_router*)malloc(sizeof(sr_router));
assert(subsystem);
sr_set_subsystem(get_sr(), subsystem);
// initialize arp and interfaces and routing table
arp_cache_init(subsystem);
interface_init(subsystem);
rrtable_init(subsystem);
hw_rrtable_init(subsystem);
//enable ospf by default
toggle_ospf_status(subsystem, TRUE);
//disable reroute/multipath
toggle_reroute_multipath_status(subsystem, FALSE);
//flush hw registers
#ifdef _CPUMODE_
hw_init(subsystem);
writeReg(&subsystem->hw_device, CPCI_REG_CTRL, 0x00010100);
usleep(2000);
#endif
} /* -- sr_integ_init -- */
void pwospf_lsu_type(struct ip* ip_header, byte* payload, uint16_t payload_len, pwospf_header_t* pwospf_header, interface_t* intf) {
printf(" ** pwospf_lsu_type(..) called \n");
printf(" ** pwospf_lsu_type(..) packet with length: %u \n", payload_len);
struct sr_instance* sr_inst = get_sr();
struct sr_router* router = (struct sr_router*)sr_get_subsystem(sr_inst);
// make lsu packet
pwospf_lsu_packet_t* lsu_packet = (pwospf_lsu_packet_t*) malloc_or_die(sizeof(pwospf_lsu_packet_t));
memcpy(&lsu_packet->seq, payload, 2);
memcpy(&lsu_packet->ttl, payload + 2, 2);
memcpy(&lsu_packet->no_of_adverts, payload + 4, 4);
// display packet
printf(" ** pwospf_lsu_type(..) displayed header contents:\n");
display_lsu_packet(lsu_packet);
// calculate number of adverts
int num_adverts = ((payload_len - 8)/sizeof(pwospf_ls_advert_t));
printf(" ** pwospf_lsu_type(..) number of adverts: %d\n", num_adverts);
// check if I generated the LSU
if(pwospf_header->router_id != intf->router_id) {
// not generated by self
// check if neighbor ever sent hello packet
pthread_mutex_lock(&intf->neighbor_lock);
node* ret = llist_find( intf->neighbor_list, predicate_id_neighbor_t,(void*) &pwospf_header->router_id);
pthread_mutex_unlock(&intf->neighbor_lock);
if(ret != NULL) {
// have received a hello packet from this neighbor in the recent past
neighbor_t *neighbor = (neighbor_t*) ret->data;
display_neighbor_t((void*) neighbor);
// check if lsu received for first time
if(neighbor->last_adverts == NULL) {
printf(" ** pwospf_lsu_type(..) first lsu received from this neighbor\n");
neighbor->last_lsu_packet = *lsu_packet;
neighbor->last_adverts = (byte*) malloc_or_die(payload_len - 8);
memcpy(neighbor->last_adverts, payload + 8, payload_len - 8);
// add to list
pthread_mutex_lock(&intf->neighbor_lock);
intf->neighbor_list = llist_update_beginning_delete(intf->neighbor_list, predicate_id_neighbor_t_neighbor_t, (void*) neighbor);
pthread_mutex_unlock(&intf->neighbor_lock);
display_neighbor_t((void*) neighbor);
// create router entry
router_entry_t router_entry;
router_entry.router_id = neighbor->id;
router_entry.area_id = 0;
//add vertex with router entry info
add_neighbor_vertex_t(router, router_entry);
//create subnet entry
subnet_entry_t* subnet_entry;
//add adverts to db
printf(" ** pwospf_lsu_type(..) adding adverts to neighbor db\n");
int i;
pwospf_ls_advert_t* ls_advert = (pwospf_ls_advert_t*) malloc_or_die(sizeof(pwospf_ls_advert_t));
for(i = 0; i < ntohl(lsu_packet->no_of_adverts) ; i++) {
memcpy(&ls_advert->subnet, payload + sizeof(pwospf_lsu_packet_t) + sizeof(pwospf_ls_advert_t) * i, 4);
memcpy(&ls_advert->mask, payload + sizeof(pwospf_lsu_packet_t) + 4 + sizeof(pwospf_ls_advert_t) * i, 4);
memcpy(&ls_advert->router_id, payload + sizeof(pwospf_lsu_packet_t) + 8 + sizeof(pwospf_ls_advert_t) * i, 4);
display_ls_advert(ls_advert);
subnet_entry = create_subnet_entry_t_advert(ls_advert);
add_subnet_entry_t(router, router_entry, subnet_entry);
}
// update vertices
update_neighbor_vertex_t(router, router_entry);
//calculate new routing table via Dijkstra
calculate_routing_table(router);
//check if route/multipath is enabled
if(router->reroute_multipath_status == TRUE) {
//run multipath
reroute_multipath(router);
}
//dijkstra2(router);
//free(lsu_packet);
//free(ret);
//free(neighbor);
//free(ls_advert);
} else {
// check if the previous seq was same
if(neighbor->last_lsu_packet.seq != lsu_packet->seq) {
// nope, new seq
neighbor->last_lsu_packet = *lsu_packet;
// flood to all neighbors
pwospf_flood_lsu(ip_header, pwospf_header, lsu_packet, neighbor, intf);
// check if content the same
printf("last adverts :%s\n", (char*) neighbor->last_adverts);
printf("new: %s\n", (char*) (payload + 8));
if(memcmp(neighbor->last_adverts, payload + 8, payload_len - 8) != 0) {
// nope new content
printf(" ** pwospf_lsu_type(..) new content neighbor db\n");
if(ntohl(neighbor->last_lsu_packet.no_of_adverts) != ntohl(lsu_packet->no_of_adverts)) {
// free mem, as new adverts might need different memory
free(neighbor->last_adverts);
// now allocate new mem space
neighbor->last_adverts = (byte*) malloc_or_die(payload_len - 8);
}
memcpy(neighbor->last_adverts, payload + 8, payload_len - 8);
neighbor->last_lsu_packet = *lsu_packet;
// update packet info in neighbor list
pthread_mutex_lock(&intf->neighbor_lock);
intf->neighbor_list = llist_update_beginning_delete(intf->neighbor_list, predicate_id_neighbor_t_neighbor_t, (void*) neighbor);
pthread_mutex_unlock(&intf->neighbor_lock);
// check if entry exists in DB
// create router entry
router_entry_t router_entry;
router_entry.router_id = neighbor->id;
router_entry.area_id = 0;
//refresh vertex with router entry info, clear previous subnets
refresh_neighbor_vertex_t(router, router_entry);
//create subnet entry
subnet_entry_t* subnet_entry;
int i;
pwospf_ls_advert_t* ls_advert = (pwospf_ls_advert_t*) malloc_or_die(sizeof(pwospf_ls_advert_t));
if(check_neighbor_vertex_t_router_entry_t_id(router, neighbor->id) == 1) {
printf(" ** pwospf_lsu_type(..) neighbor already known, checking if any new adverts\n");
//neighbor present in db, check if any new adverts
for(i = 0; i < ntohl(lsu_packet->no_of_adverts) ; i++) {
memcpy(&ls_advert->subnet, payload + sizeof(pwospf_lsu_packet_t) + sizeof(pwospf_ls_advert_t) * i, 4);
memcpy(&ls_advert->mask, payload + sizeof(pwospf_lsu_packet_t) + 4
+ sizeof(pwospf_ls_advert_t) * i, 4);
memcpy(&ls_advert->router_id, payload + sizeof(pwospf_lsu_packet_t) + 8 + sizeof(pwospf_ls_advert_t) * i, 4);
display_ls_advert(ls_advert);
subnet_entry = create_subnet_entry_t_advert(ls_advert);
add_subnet_entry_t(router, router_entry, subnet_entry);
}
// update vertices
update_neighbor_vertex_t(router, router_entry);
}
//run Djikstra's algo to calculate new routing table
calculate_routing_table(router);
//check if route/multipath is enabled
if(router->reroute_multipath_status == TRUE) {
//run multipath
reroute_multipath(router);
}
//dijkstra2(router);
} else {
printf(" ** pwospf_lsu_type(..) error, content same as previous from this neighbor, only updating time stamp in DB\n");
// update timestamp
// create router entry
router_entry_t router_entry;
router_entry.router_id = neighbor->id;
router_entry.area_id = 0;
update_neighbor_vertex_t_timestamp(router, router_entry);
}
} else {
printf(" ** pwospf_lsu_type(..) error, seq same as previous one from this neighbor, dropping\n");
}
}
} else {
printf(" ** pwospf_lsu_type(..) error, neighbor hasn't said hello recently, dropping\n");
}
} else {
//drop packet
printf(" ** pwospf_lsu_type(..) error, LSU generated by self. dropping\n");
//free stuff
free(lsu_packet);
}
}
void pwospf_send_lsu() {
printf(" ** pwospf_send_lsu(..) called\n");
// get instance of router
struct sr_instance* sr_inst = get_sr();
struct sr_router* router = (struct sr_router*)sr_get_subsystem(sr_inst);
int num_adverts = 0;
byte* ls_adverts = get_ls_adverts_src(router, &num_adverts);
int i = 0;
node* first = NULL;
neighbor_t* neighbor = NULL;
printf(" ** pwospf_send_lsu(..) number of adverts: %d\n", num_adverts);
printf(" ** pwospf_send_lsu(..) adverts:\n");
display_neighbor_vertices_src(router);
// now create lsu_packet
pwospf_lsu_packet_t *lsu_packet = (pwospf_lsu_packet_t*) malloc_or_die(sizeof(pwospf_lsu_packet_t));
//increment lsu sequence
router->ls_info.lsu_seq = router->ls_info.lsu_seq + 1;
lsu_packet->seq = htons(router->ls_info.lsu_seq);
uint16_t ttl = PWOSPF_LSU_TTL;
lsu_packet->ttl = htons(ttl);
lsu_packet->no_of_adverts = htonl(num_adverts);
// calculate length of entire pwospf packet
uint16_t pwospf_packet_len = sizeof(pwospf_lsu_packet_t) + sizeof(pwospf_header_t) + sizeof(pwospf_ls_advert_t) * num_adverts;
//make pwospf header
pwospf_header_t* pwospf_header = (pwospf_header_t*) malloc_or_die(sizeof(pwospf_header_t));
pwospf_header->version = PWOSPF_VER;
pwospf_header->type = PWOSPF_TYPE_LSU;
pwospf_header->len = htons(pwospf_packet_len);
pwospf_header->router_id = router->ls_info.router_id;
pwospf_header->area_id = router->ls_info.area_id;
pwospf_header->checksum = 0;
pwospf_header->au_type = PWOSPF_AU_TYPE;
pwospf_header->authentication = PWOSPF_AUTHEN;
// generate raw packet
byte* pwospf_packet = (byte*) malloc_or_die(pwospf_packet_len);
memcpy(pwospf_packet, pwospf_header, sizeof(pwospf_header_t));
memcpy(pwospf_packet + sizeof(pwospf_header_t), lsu_packet, sizeof(pwospf_lsu_packet_t));
memcpy(pwospf_packet + sizeof(pwospf_header_t) + sizeof(pwospf_lsu_packet_t), ls_adverts, sizeof(pwospf_ls_advert_t) * num_adverts);
// generate checksum
pwospf_header->checksum = htons(htons(inet_chksum((void*) pwospf_packet, pwospf_packet_len)));
memcpy(pwospf_packet, pwospf_header, sizeof(pwospf_header_t));
free(ls_adverts);
free(lsu_packet);
free(pwospf_header);
printf(" ** pwospf_send_lsu(..) pwospf packet with length %u generated\n", pwospf_packet_len);
// now iterate through each interface
for( i = 0; i < router->num_interfaces ; i++) {
// now iterate this interface's neighbors list
first = router->interface[i].neighbor_list;
pthread_mutex_lock(&router->interface[i].neighbor_lock);
while(first != NULL) {
// get neighbor
neighbor = (neighbor_t*) first->data;
if(neighbor != NULL) {
struct in_addr src, dst;
src.s_addr = router->interface[i].ip;
dst.s_addr = neighbor->ip;
make_ip_packet(pwospf_packet, pwospf_packet_len, dst, src, IP_PROTOCOL_OSPF);
}
first = first->next;
}
pthread_mutex_unlock(&router->interface[i].neighbor_lock);
}
}