/*
* Copyright (c) 1998 by the University of Southern California.
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation in source and binary forms for lawful
* purposes and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both
* the copyright notice and this permission notice appear in supporting
* documentation, and that any documentation, advertising materials,
* and other materials related to such distribution and use acknowledge
* that the software was developed by the University of Southern
* California and/or Information Sciences Institute.
* The name of the University of Southern California may not
* be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
* ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
* PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
* NON-INFRINGEMENT.
*
* IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
* TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
* THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
* Other copyrights might apply to parts of this software and are so
* noted when applicable.
*/
/*
* Questions concerning this software should be directed to
* Pavlin Ivanov Radoslavov (pavlin@catarina.usc.edu)
*
* $Id: vif.c,v 1.1.1.1 2017/06/12 07:58:55 misho Exp $
*/
/*
* Part of this program has been derived from mrouted.
* The mrouted program is covered by the license in the accompanying file
* named "LICENSE.mrouted".
*
* The mrouted program is COPYRIGHT 1989 by The Board of Trustees of
* Leland Stanford Junior University.
*
*/
#include "defs.h"
/*
* Exported variables.
*/
struct uvif uvifs[MAXVIFS]; /* array of all virtual interfaces */
vifi_t numvifs; /* Number of vifs in use */
int vifs_down; /* 1=>some interfaces are down */
int phys_vif; /* An enabled vif */
int udp_socket; /* Since the honkin' kernel doesn't support */
/* ioctls on raw IP sockets, we need a UDP */
/* socket as well as our IGMP (raw) socket. */
/* How dumb. */
int total_interfaces; /* Number of all interfaces: including the
* non-configured, but excluding the
* loopback interface and the non-multicast
* capable interfaces.
*/
/*
* Forward declarations.
*/
static void start_vif __P((vifi_t vifi));
static void stop_vif __P((vifi_t vifi));
static void start_all_vifs __P(());
void
init_vifs()
{
vifi_t vifi;
struct uvif *v;
int enabled_vifs;
numvifs = 0;
vifs_down = FALSE;
/*
* Configure the vifs based on the interface configuration of the
* the kernel and the contents of the configuration file.
* (Open a UDP socket for ioctl use in the config procedures if
* the kernel can't handle IOCTL's on the IGMP socket.)
*/
#ifdef IOCTL_OK_ON_RAW_SOCKET
udp_socket = igmp_socket;
#else
if ((udp_socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
log(LOG_ERR, errno, "UDP socket");
#endif
/*
* Clean up all vifs
*/
for (vifi = 0, v = uvifs; vifi < MAXVIFS; ++vifi, ++v) {
v->uv_flags = 0;
v->uv_metric = DEFAULT_METRIC;
v->uv_admetric = 0;
v->uv_threshold = DEFAULT_THRESHOLD;
v->uv_rate_limit = DEFAULT_PHY_RATE_LIMIT;
v->uv_lcl_addr = INADDR_ANY_N;
v->uv_rmt_addr = INADDR_ANY_N;
v->uv_dst_addr = INADDR_ANY_N;
v->uv_subnet = INADDR_ANY_N;
v->uv_subnetmask = INADDR_ANY_N;
v->uv_subnetbcast = INADDR_ANY_N;
strncpy(v->uv_name, "", IFNAMSIZ);
v->uv_groups = (struct listaddr *)NULL;
v->uv_dvmrp_neighbors = (struct listaddr *)NULL;
NBRM_CLRALL(v->uv_nbrmap);
v->uv_querier = (struct listaddr *)NULL;
v->uv_igmpv1_warn = 0;
v->uv_prune_lifetime = 0;
v->uv_acl = (struct vif_acl *)NULL;
RESET_TIMER(v->uv_leaf_timer);
v->uv_addrs = (struct phaddr *)NULL;
v->uv_filter = (struct vif_filter *)NULL;
RESET_TIMER(v->uv_pim_hello_timer);
RESET_TIMER(v->uv_gq_timer);
v->uv_pim_neighbors = (struct pim_nbr_entry *)NULL;
v->uv_local_pref = default_source_preference;
v->uv_local_metric = default_source_metric;
}
log(LOG_INFO, 0, "Getting vifs from kernel");
config_vifs_from_kernel();
log(LOG_INFO, 0, "Getting vifs from %s", configfilename);
config_vifs_from_file();
/*
* Quit if there are fewer than two enabled vifs.
*/
enabled_vifs = 0;
phys_vif = -1;
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN))
continue;
if (phys_vif == -1)
phys_vif = vifi;
enabled_vifs++;
}
if (enabled_vifs < 2)
log(LOG_ERR, 0, "can't forward: %s",
enabled_vifs == 0 ? "no enabled vifs" : "only one enabled vif");
k_init_pim(igmp_socket); /* Call to kernel to initiliaze structures */
start_all_vifs();
}
static void
start_all_vifs()
{
vifi_t vifi;
struct uvif *v;
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
/* Start vif if not DISABLED or DOWN */
if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN)) {
if (v->uv_flags & VIFF_DISABLED)
log(LOG_INFO, 0,
"%s is DISABLED; vif #%u out of service",
v->uv_name, vifi);
else
log(LOG_INFO, 0,
"%s is DOWN; vif #%u out of service",
v->uv_name, vifi);
}
else
start_vif(vifi);
}
}
/*
* stop all vifs
*/
void
stop_all_vifs()
{
vifi_t vifi;
for (vifi = 0; vifi < numvifs; vifi++) {
stop_vif(vifi);
}
}
/*
* Initialize the vif and add to the kernel. The vif can be either
* physical, tunnel (tunnels will be used in the future
* when this code becomes PIM multicast boarder router.
*/
static void
start_vif(vifi)
vifi_t vifi;
{
struct uvif *v;
u_int32 src;
v = &uvifs[vifi];
src = v->uv_lcl_addr;
/* Initialy no router on any vif */
v->uv_flags = (v->uv_flags | VIFF_DR | VIFF_NONBRS) & ~VIFF_DOWN;
SET_TIMER(v->uv_pim_hello_timer, 1 + RANDOM() % PIM_TIMER_HELLO_PERIOD);
RESET_TIMER(v->uv_gq_timer);
v->uv_pim_neighbors = (pim_nbr_entry_t *)NULL;
/* Tell kernel to add, i.e. start this vif */
k_add_vif(igmp_socket, vifi, &uvifs[vifi]);
log(LOG_INFO, 0, "%s comes up; vif #%u now in service", v->uv_name, vifi);
/*
* Join the PIM multicast group on the interface.
*/
k_join(igmp_socket, allpimrouters_group, src);
/*
* Join the ALL-ROUTERS multicast group on the interface.
* This allows mtrace requests to loop back if they are run
* on the multicast router.
*/
k_join(igmp_socket, allrouters_group, src);
/*
* Until neighbors are discovered, assume responsibility for sending
* periodic group membership queries to the subnet. Send the first
* query.
*/
v->uv_flags |= VIFF_QUERIER;
query_groups(v);
/*
* Send a probe via the new vif to look for neighbors.
*/
send_pim_hello(v, PIM_TIMER_HELLO_HOLDTIME);
}
/*
* Stop a vif (either physical interface or tunnel).
* If we are running only PIM we don't have tunnels.
*/
static void
stop_vif(vifi)
vifi_t vifi;
{
struct uvif *v;
struct listaddr *a;
register pim_nbr_entry_t *n, *next;
struct vif_acl *acl;
/*
* TODO: make sure that the kernel viftable is
* consistent with the daemon table
*/
v = &uvifs[vifi];
k_leave(igmp_socket, allpimrouters_group, v->uv_lcl_addr);
k_leave(igmp_socket, allrouters_group, v->uv_lcl_addr);
/*
* Discard all group addresses. (No need to tell kernel;
* the k_del_vif() call will clean up kernel state.)
*/
while (v->uv_groups != NULL) {
a = v->uv_groups;
v->uv_groups = a->al_next;
free((char *)a);
}
/*
* TODO: inform (eventually) the neighbors I am going down by sending
* PIM_HELLO with holdtime=0 so someone else should become a DR.
*/
/* TODO: dummy! Implement it!! Any problems if don't use it? */
delete_vif_from_mrt(vifi);
/*
* Delete the interface from the kernel's vif structure.
*/
k_del_vif(igmp_socket, vifi);
v->uv_flags = (v->uv_flags & ~VIFF_DR & ~VIFF_QUERIER & ~VIFF_NONBRS )
| VIFF_DOWN;
RESET_TIMER(v->uv_pim_hello_timer);
RESET_TIMER(v->uv_gq_timer);
for (n = v->uv_pim_neighbors; n != NULL; n = next) {
next = n->next; /* Free the space for each neighbour */
free((char *)n);
}
v->uv_pim_neighbors = NULL;
/* TODO: currently not used */
/* The Access Control List (list with the scoped addresses) */
while (v->uv_acl != NULL) {
acl = v->uv_acl;
v->uv_acl = acl->acl_next;
free((char *)acl);
}
vifs_down = TRUE;
log(LOG_INFO, 0,
"%s goes down; vif #%u out of service", v->uv_name, vifi);
}
/*
* See if any interfaces have changed from up state to down, or vice versa,
* including any non-multicast-capable interfaces that are in use as local
* tunnel end-points. Ignore interfaces that have been administratively
* disabled.
*/
void
check_vif_state()
{
register vifi_t vifi;
register struct uvif *v;
struct ifreq ifr;
static int checking_vifs = 0;
/*
* XXX: TODO: True only for DVMRP?? Check.
* If we get an error while checking, (e.g. two interfaces go down
* at once, and we decide to send a prune out one of the failed ones)
* then don't go into an infinite loop!
*/
if (checking_vifs)
return;
vifs_down = FALSE;
checking_vifs = 1;
/* TODO: Check all potential interfaces!!! */
/* Check the physical and tunnels only */
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (v->uv_flags & VIFF_DISABLED)
continue;
strncpy(ifr.ifr_name, v->uv_name, IFNAMSIZ);
/* get the interface flags */
if (ioctl(udp_socket, SIOCGIFFLAGS, (char *)&ifr) < 0)
log(LOG_ERR, errno,
"check_vif_state: ioctl SIOCGIFFLAGS for %s", ifr.ifr_name);
if (v->uv_flags & VIFF_DOWN) {
if (ifr.ifr_flags & IFF_UP) {
start_vif(vifi);
}
else vifs_down = TRUE;
}
else {
if (!(ifr.ifr_flags & IFF_UP)) {
log(LOG_NOTICE, 0,
"%s has gone down; vif #%u taken out of service",
v->uv_name, vifi);
stop_vif(vifi);
vifs_down = TRUE;
}
}
}
checking_vifs = 0;
}
/*
* If the source is directly connected to us, find the vif number for
* the corresponding physical interface (tunnels excluded).
* Local addresses are excluded.
* Return the vif number or NO_VIF if not found.
*/
vifi_t
find_vif_direct(src)
u_int32 src;
{
vifi_t vifi;
register struct uvif *v;
register struct phaddr *p;
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_TUNNEL))
continue;
if (src == v->uv_lcl_addr)
return (NO_VIF); /* src is one of our IP addresses */
if ((src & v->uv_subnetmask) == v->uv_subnet &&
((v->uv_subnetmask == 0xffffffff) ||
(src != v->uv_subnetbcast)))
return(vifi);
/* Check the extra subnets for this vif */
/* TODO: don't think currently pimd can handle extra subnets */
for (p = v->uv_addrs; p; p = p->pa_next) {
if ((src & p->pa_subnetmask) == p->pa_subnet &&
((p->pa_subnetmask == 0xffffffff) ||
(src != p->pa_subnetbcast)))
return(vifi);
}
}
return (NO_VIF);
}
/*
* Checks if src is local address. If "yes" return the vif index,
* otherwise return value is NO_VIF.
*/
vifi_t
local_address(src)
u_int32 src;
{
vifi_t vifi;
register struct uvif *v;
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN))
continue;
if (src != v->uv_lcl_addr)
continue;
else
return(vifi);
}
/* Returning NO_VIF means not a local address */
return (NO_VIF);
}
/*
* If the source is directly connected, or is local address,
* find the vif number for the corresponding physical interface
* (tunnels excluded).
* Return the vif number or NO_VIF if not found.
*/
vifi_t
find_vif_direct_local(src)
u_int32 src;
{
vifi_t vifi;
register struct uvif *v;
register struct phaddr *p;
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN | VIFF_TUNNEL))
continue;
if (src == v->uv_lcl_addr)
return (vifi); /* src is one of our IP addresses */
if ((src & v->uv_subnetmask) == v->uv_subnet &&
((v->uv_subnetmask == 0xffffffff) ||
(src != v->uv_subnetbcast)))
return(vifi);
/* Check the extra subnets for this vif */
/* TODO: don't think currently pimd can handle extra subnets */
for (p = v->uv_addrs; p; p = p->pa_next) {
if ((src & p->pa_subnetmask) == p->pa_subnet &&
((p->pa_subnetmask == 0xffffffff) ||
(src != p->pa_subnetbcast)))
return(vifi);
}
}
return (NO_VIF);
}
/*
* Returns the highest address of local vif that is UP and ENABLED.
*/
u_int32
max_local_address()
{
vifi_t vifi;
struct uvif *v;
u_int32 max_address = 0;
for (vifi = 0, v = uvifs; vifi < numvifs; ++vifi, ++v) {
/* Count vif if not DISABLED or DOWN */
if (v->uv_flags & (VIFF_DISABLED | VIFF_DOWN))
continue;
if (ntohl(v->uv_lcl_addr) > ntohl(max_address))
max_address = v->uv_lcl_addr;
}
return(max_address);
}
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