/*-
* Copyright (c) 2015
* Alexander V. Chernikov <melifaro@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/kernel.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/route/route_ctl.h>
#include <net/route/route_var.h>
#include <net/route/nhop.h>
#include <net/toeplitz.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet/ip_mroute.h>
#include <netinet/ip6.h>
#include <netinet6/in6_fib.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#include <netinet6/scope6_var.h>
#include <net/if_types.h>
#ifdef INET6
CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst);
#ifdef ROUTE_MPATH
struct _hash_5tuple_ipv6 {
struct in6_addr src;
struct in6_addr dst;
unsigned short src_port;
unsigned short dst_port;
char proto;
char spare[3];
};
_Static_assert(sizeof(struct _hash_5tuple_ipv6) == 40,
"_hash_5tuple_ipv6 size is wrong");
uint32_t
fib6_calc_software_hash(const struct in6_addr *src, const struct in6_addr *dst,
unsigned short src_port, unsigned short dst_port, char proto,
uint32_t *phashtype)
{
struct _hash_5tuple_ipv6 data;
data.src = *src;
data.dst = *dst;
data.src_port = src_port;
data.dst_port = dst_port;
data.proto = proto;
data.spare[0] = data.spare[1] = data.spare[2] = 0;
*phashtype = M_HASHTYPE_OPAQUE_HASH;
return (toeplitz_hash(MPATH_ENTROPY_KEY_LEN, mpath_entropy_key,
sizeof(data), (uint8_t *)&data));
}
#endif
/*
* Looks up path in fib @fibnum specified by @dst.
* Assumes scope is deembedded and provided in @scopeid.
*
* Returns path nexthop on success. Nexthop is safe to use
* within the current network epoch. If longer lifetime is required,
* one needs to pass NHR_REF as a flag. This will return referenced
* nexthop.
*/
struct nhop_object *
fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6,
uint32_t scopeid, uint32_t flags, uint32_t flowid)
{
RIB_RLOCK_TRACKER;
struct rib_head *rh;
struct radix_node *rn;
struct nhop_object *nh;
struct sockaddr_in6 sin6;
KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
rh = rt_tables_get_rnh(fibnum, AF_INET6);
if (rh == NULL)
return (NULL);
/* TODO: radix changes */
//addr = *dst6;
/* Prepare lookup key */
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *dst6;
/* Assume scopeid is valid and embed it directly */
if (IN6_IS_SCOPE_LINKLOCAL(dst6))
sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
RIB_RLOCK(rh);
rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
nh = nhop_select((RNTORT(rn))->rt_nhop, flowid);
/* Ensure route & ifp is UP */
if (RT_LINK_IS_UP(nh->nh_ifp)) {
if (flags & NHR_REF)
nhop_ref_object(nh);
RIB_RUNLOCK(rh);
return (nh);
}
}
RIB_RUNLOCK(rh);
RTSTAT_INC(rts_unreach);
return (NULL);
}
inline static int
check_urpf_nhop(const struct nhop_object *nh, uint32_t flags,
const struct ifnet *src_if)
{
if (src_if != NULL && nh->nh_aifp == src_if) {
return (1);
}
if (src_if == NULL) {
if ((flags & NHR_NODEFAULT) == 0)
return (1);
else if ((nh->nh_flags & NHF_DEFAULT) == 0)
return (1);
}
return (0);
}
static int
check_urpf(struct nhop_object *nh, uint32_t flags,
const struct ifnet *src_if)
{
#ifdef ROUTE_MPATH
if (NH_IS_NHGRP(nh)) {
struct weightened_nhop *wn;
uint32_t num_nhops;
wn = nhgrp_get_nhops((struct nhgrp_object *)nh, &num_nhops);
for (int i = 0; i < num_nhops; i++) {
if (check_urpf_nhop(wn[i].nh, flags, src_if) != 0)
return (1);
}
return (0);
} else
#endif
return (check_urpf_nhop(nh, flags, src_if));
}
/*
* Performs reverse path forwarding lookup.
* If @src_if is non-zero, verifies that at least 1 path goes via
* this interface.
* If @src_if is zero, verifies that route exist.
* if @flags contains NHR_NOTDEFAULT, do not consider default route.
*
* Returns 1 if route matching conditions is found, 0 otherwise.
*/
int
fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6,
uint32_t scopeid, uint32_t flags, const struct ifnet *src_if)
{
RIB_RLOCK_TRACKER;
struct rib_head *rh;
struct radix_node *rn;
struct sockaddr_in6 sin6;
int ret;
KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum"));
rh = rt_tables_get_rnh(fibnum, AF_INET6);
if (rh == NULL)
return (0);
/* TODO: radix changes */
/* Prepare lookup key */
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *dst6;
/* Assume scopeid is valid and embed it directly */
if (IN6_IS_SCOPE_LINKLOCAL(dst6))
sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
RIB_RLOCK(rh);
rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
ret = check_urpf(RNTORT(rn)->rt_nhop, flags, src_if);
RIB_RUNLOCK(rh);
return (ret);
}
RIB_RUNLOCK(rh);
return (0);
}
struct nhop_object *
fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6,
uint32_t scopeid, uint32_t flags)
{
struct rib_head *rh;
struct radix_node *rn;
struct nhop_object *nh;
struct sockaddr_in6 sin6;
KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum"));
rh = rt_tables_get_rnh(fibnum, AF_INET6);
if (rh == NULL)
return (NULL);
/* TODO: radix changes */
//addr = *dst6;
/* Prepare lookup key */
memset(&sin6, 0, sizeof(sin6));
sin6.sin6_len = sizeof(struct sockaddr_in6);
sin6.sin6_addr = *dst6;
/* Assume scopeid is valid and embed it directly */
if (IN6_IS_SCOPE_LINKLOCAL(dst6))
sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff);
rn = rh->rnh_matchaddr((void *)&sin6, &rh->head);
if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
nh = nhop_select((RNTORT(rn))->rt_nhop, 0);
/* Ensure route & ifp is UP */
if (RT_LINK_IS_UP(nh->nh_ifp)) {
if (flags & NHR_REF)
nhop_ref_object(nh);
return (nh);
}
}
return (NULL);
}
#endif
