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sys/net/route/mpath_ctl.c
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/*- | |||||
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD | |||||
* | |||||
* Copyright (c) 2020 Alexander V. Chernikov | |||||
* | |||||
* 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. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. | |||||
* | |||||
* $FreeBSD$ | |||||
*/ | |||||
#include "opt_inet.h" | |||||
#include "opt_route.h" | |||||
#include <sys/cdefs.h> | |||||
#include <sys/param.h> | |||||
#include <sys/systm.h> | |||||
#include <sys/lock.h> | |||||
#include <sys/rmlock.h> | |||||
#include <sys/rwlock.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/vnet.h> | |||||
#include <netinet/in.h> | |||||
#include <netinet/in_var.h> | |||||
#include <netinet/in_fib.h> | |||||
#include <net/route/nhop_utils.h> | |||||
#include <net/route/nhop.h> | |||||
#include <net/route/nhop_var.h> | |||||
/* | |||||
* This file contains the supporting functions for adding/deleting/updating | |||||
* multipath routes to the routing table. | |||||
*/ | |||||
SYSCTL_DECL(_net_route); | |||||
VNET_DEFINE(u_int, fib_hash_outbound) = 0; | |||||
SYSCTL_UINT(_net_route, OID_AUTO, hash_outbound, CTLFLAG_RD | CTLFLAG_VNET, | |||||
&VNET_NAME(fib_hash_outbound), 0, | |||||
"Compute flowid for locally-originated packets"); | |||||
/* Default entropy to add to the hash calculation for the outbound connections*/ | |||||
uint8_t mpath_entropy_key[MPATH_ENTROPY_KEY_LEN] = { | |||||
0x6d, 0x5a, 0x56, 0xda, 0x25, 0x5b, 0x0e, 0xc2, | |||||
0x41, 0x67, 0x25, 0x3d, 0x43, 0xa3, 0x8f, 0xb0, | |||||
0xd0, 0xca, 0x2b, 0xcb, 0xae, 0x7b, 0x30, 0xb4, | |||||
0x77, 0xcb, 0x2d, 0xa3, 0x80, 0x30, 0xf2, 0x0c, | |||||
0x6a, 0x42, 0xb7, 0x3b, 0xbe, 0xac, 0x01, 0xfa, | |||||
}; | |||||
/* | |||||
* Tries to add @rnd_add nhop to the existing set of nhops (@nh_orig) for the | |||||
* prefix specified by @rt. | |||||
* | |||||
* Return 0 ans consumes rt / rnd_add nhop references. @rc gets populated | |||||
* with the operation result. | |||||
* Otherwise errno is returned. | |||||
* | |||||
* caller responsibility is to unlock/free rt and | |||||
* rt->rt_nhop. | |||||
*/ | |||||
int | |||||
add_route_mpath(struct rib_head *rnh, struct rt_addrinfo *info, | |||||
struct rtentry *rt, struct route_nhop_data *rnd_add, | |||||
struct route_nhop_data *rnd_orig, struct rib_cmd_info *rc) | |||||
{ | |||||
RIB_RLOCK_TRACKER; | |||||
struct route_nhop_data rnd_new; | |||||
int error = 0; | |||||
/* | |||||
* It is possible that multiple rtsock speakers will try to update | |||||
* the same route simultaneously. Reduce the chance of failing the | |||||
* request by retrying the cycle multiple times. | |||||
*/ | |||||
for (int i = 0; i < RIB_MAX_RETRIES; i++) { | |||||
error = nhgrp_get_addition_group(rnh, rnd_orig, rnd_add, | |||||
&rnd_new); | |||||
if (error != 0) { | |||||
if (error != EAGAIN) | |||||
break; | |||||
/* | |||||
* Group creation failed, most probably because | |||||
* @rnd_orig data got scheduled for deletion. | |||||
* Refresh @rnd_orig data and retry. | |||||
*/ | |||||
RIB_RLOCK(rnh); | |||||
lookup_prefix(rnh, info, rnd_orig); | |||||
RIB_RUNLOCK(rnh); | |||||
continue; | |||||
} | |||||
error = change_route_conditional(rnh, rt, info, rnd_orig, | |||||
&rnd_new, rc); | |||||
if (error != EAGAIN) | |||||
break; | |||||
RTSTAT_INC(rts_add_retry); | |||||
} | |||||
if (V_fib_hash_outbound == 0 && error == 0 && | |||||
NH_IS_NHGRP(rc->rc_nh_new)) { | |||||
/* | |||||
* First multipath route got installed. Enable local | |||||
* outbound connections hashing. | |||||
*/ | |||||
if (bootverbose) | |||||
printf("FIB: enabled flowid calculation for locally-originated packets\n"); | |||||
V_fib_hash_outbound = 1; | |||||
} | |||||
return (error); | |||||
} | |||||
static bool | |||||
gw_filter_func(const struct nhop_object *nh, void *_data) | |||||
{ | |||||
struct sockaddr *gw = (struct sockaddr *)_data; | |||||
return (match_nhop_gw(nh, gw)); | |||||
} | |||||
/* | |||||
* Tries to delete matching paths from @nhg. | |||||
* Returns 0 on success and updates operation result in @rc. | |||||
*/ | |||||
int | |||||
del_route_mpath(struct rib_head *rh, struct rt_addrinfo *info, | |||||
struct rtentry *rt, struct nhgrp_object *nhg, | |||||
struct rib_cmd_info *rc) | |||||
{ | |||||
struct route_nhop_data rnd; | |||||
struct sockaddr *gw; | |||||
int error; | |||||
RIB_WLOCK_ASSERT(rh); | |||||
gw = info->rti_info[RTAX_GATEWAY]; | |||||
if (gw == NULL) | |||||
return (ESRCH); | |||||
error = nhgrp_get_filtered_group(rh, nhg, gw_filter_func, (void *)gw, | |||||
&rnd); | |||||
if (error == 0) | |||||
error = change_route_nhop(rh, rt, info, &rnd, rc); | |||||
return (error); | |||||
} | |||||