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// SPDX-License-Identifier: MIT
/*
Copyright 2007, 2008 by Grégoire Henry, Julien Cristau and Juliusz Chroboczek
Copyright 2011, 2012 by Matthieu Boutier and Juliusz Chroboczek
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/time.h>
#include <sys/param.h>
#include <time.h>
#include "babeld.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <zebra.h>
#include "prefix.h"
#include "zclient.h"
#include "kernel.h"
#include "privs.h"
#include "command.h"
#include "vty.h"
#include "memory.h"
#include "thread.h"
#include "nexthop.h"
#include "util.h"
#include "babel_interface.h"
#include "babel_zebra.h"
static int
zebra_route(int add, int familt, const unsigned char *pref, unsigned short plen,
const unsigned char *gate, int ifindex, unsigned int metric);
int
kernel_interface_operational(struct interface *interface)
{
return if_is_operative(interface);
}
int
kernel_interface_mtu(struct interface *interface)
{
return MIN(interface->mtu, interface->mtu6);
}
int
kernel_interface_wireless(struct interface *interface)
{
return 0;
}
int
kernel_route(enum babel_kernel_routes operation, const unsigned char *pref,
unsigned short plen, const unsigned char *gate, int ifindex,
unsigned int metric, const unsigned char *newgate, int newifindex,
unsigned int newmetric)
{
int rc;
int family;
/* Check that the protocol family is consistent. */
if(plen >= 96 && v4mapped(pref)) {
if(!v4mapped(gate)) {
errno = EINVAL;
return -1;
}
family = AF_INET;
} else {
if(v4mapped(gate)) {
errno = EINVAL;
return -1;
}
family = AF_INET6;
}
switch (operation) {
case ROUTE_ADD:
return zebra_route(1, family, pref, plen, gate, ifindex, metric);
case ROUTE_FLUSH:
return zebra_route(0, family, pref, plen, gate, ifindex, metric);
case ROUTE_MODIFY:
if(newmetric == metric && memcmp(newgate, gate, 16) == 0 &&
newifindex == ifindex)
return 0;
debugf(BABEL_DEBUG_ROUTE, "Modify route: delete old; add new.");
rc = zebra_route(0, family, pref, plen, gate, ifindex, metric);
if (rc < 0)
return -1;
rc = zebra_route(1, family, pref, plen, newgate, newifindex,
newmetric);
return rc;
}
return 0;
}
static int
zebra_route(int add, int family, const unsigned char *pref, unsigned short plen,
const unsigned char *gate, int ifindex, unsigned int metric)
{
struct zapi_route api; /* quagga's communication system */
struct prefix quagga_prefix; /* quagga's prefix */
union g_addr babel_prefix_addr; /* babeld's prefix addr */
struct zapi_nexthop *api_nh; /* next router to go - no ECMP */
api_nh = &api.nexthops[0];
/* convert to be understandable by quagga */
/* convert given addresses */
switch (family) {
case AF_INET:
uchar_to_inaddr(&babel_prefix_addr.ipv4, pref);
break;
case AF_INET6:
uchar_to_in6addr(&babel_prefix_addr.ipv6, pref);
break;
}
/* make prefix structure */
memset (&quagga_prefix, 0, sizeof(quagga_prefix));
quagga_prefix.family = family;
switch (family) {
case AF_INET:
IPV4_ADDR_COPY (&quagga_prefix.u.prefix4, &babel_prefix_addr.ipv4);
/* our plen is for v4mapped's addr */
quagga_prefix.prefixlen = plen - 96;
break;
case AF_INET6:
IPV6_ADDR_COPY (&quagga_prefix.u.prefix6, &babel_prefix_addr.ipv6);
quagga_prefix.prefixlen = plen;
break;
}
apply_mask(&quagga_prefix);
memset(&api, 0, sizeof(api));
api.type = ZEBRA_ROUTE_BABEL;
api.safi = SAFI_UNICAST;
api.vrf_id = VRF_DEFAULT;
api.prefix = quagga_prefix;
if(metric >= KERNEL_INFINITY) {
zapi_route_set_blackhole(&api, BLACKHOLE_REJECT);
} else {
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
api.nexthop_num = 1;
api_nh->ifindex = ifindex;
api_nh->vrf_id = VRF_DEFAULT;
switch (family) {
case AF_INET:
uchar_to_inaddr(&api_nh->gate.ipv4, gate);
if (IPV4_ADDR_SAME(&api_nh->gate.ipv4, &quagga_prefix.u.prefix4)
&& quagga_prefix.prefixlen == IPV4_MAX_BITLEN) {
api_nh->type = NEXTHOP_TYPE_IFINDEX;
} else {
api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
}
break;
case AF_INET6:
uchar_to_in6addr(&api_nh->gate.ipv6, gate);
/* difference to IPv4: always leave the linklocal as nexthop */
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
break;
}
SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
api.metric = metric;
}
debugf(BABEL_DEBUG_ROUTE, "%s route (%s) to zebra",
add ? "adding" : "removing",
(family == AF_INET) ? "ipv4" : "ipv6");
return zclient_route_send (add ? ZEBRA_ROUTE_ADD : ZEBRA_ROUTE_DELETE,
zclient, &api);
}
int
if_eui64(int ifindex, unsigned char *eui)
{
struct interface *ifp = if_lookup_by_index(ifindex, VRF_DEFAULT);
if (ifp == NULL) {
return -1;
}
uint8_t len = (uint8_t)ifp->hw_addr_len;
char *tmp = (void*) ifp->hw_addr;
if (len == 8) {
memcpy(eui, tmp, 8);
eui[0] ^= 2;
} else if (len == 6) {
memcpy(eui, tmp, 3);
eui[3] = 0xFF;
eui[4] = 0xFE;
memcpy(eui+5, tmp+3, 3);
} else {
return -1;
}
return 0;
}
/* Like gettimeofday, but returns monotonic time. If POSIX clocks are not
available, falls back to gettimeofday but enforces monotonicity. */
void
gettime(struct timeval *tv)
{
monotime(tv);
}
/* If /dev/urandom doesn't exist, this will fail with ENOENT, which the
caller will deal with gracefully. */
int
read_random_bytes(void *buf, size_t len)
{
int fd;
int rc;
fd = open("/dev/urandom", O_RDONLY);
if(fd < 0) {
rc = -1;
} else {
rc = read(fd, buf, len);
if(rc < 0 || (unsigned) rc < len)
rc = -1;
close(fd);
}
return rc;
}
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