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freebsd-skq/sys/net80211/ieee80211_hwmp.c
Pawel Biernacki 08f5e6bb81 Mark more nodes as CTLFLAG_MPSAFE or CTLFLAG_NEEDGIANT (7 of many) 
r357614 added CTLFLAG_NEEDGIANT to make it easier to find nodes that are
still not MPSAFE (or already are but aren’t properly marked).
Use it in preparation for a general review of all nodes.

This is non-functional change that adds annotations to SYSCTL_NODE and
SYSCTL_PROC nodes using one of the soon-to-be-required flags.

Mark all low hanging fruits as MPSAFE.

Reviewed by:	markj
Approved by:	kib (mentor, blanket)
Differential Revision:	https://reviews.freebsd.org/D23626
2020-02-21 16:32:17 +00:00

2094 lines
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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2009 The FreeBSD Foundation
* All rights reserved.
*
* This software was developed by Rui Paulo under sponsorship from the
* FreeBSD Foundation.
*
* 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.
*/
#include <sys/cdefs.h>
#ifdef __FreeBSD__
__FBSDID("$FreeBSD$");
#endif
/*
* IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP.
*
* Based on March 2009, D3.0 802.11s draft spec.
*/
#include "opt_inet.h"
#include "opt_wlan.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/malloc.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/endian.h>
#include <sys/errno.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_media.h>
#include <net/if_llc.h>
#include <net/ethernet.h>
#include <net/bpf.h>
#include <net80211/ieee80211_var.h>
#include <net80211/ieee80211_action.h>
#include <net80211/ieee80211_input.h>
#include <net80211/ieee80211_mesh.h>
static void hwmp_vattach(struct ieee80211vap *);
static void hwmp_vdetach(struct ieee80211vap *);
static int hwmp_newstate(struct ieee80211vap *,
enum ieee80211_state, int);
static int hwmp_send_action(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN],
uint8_t *, size_t);
static uint8_t * hwmp_add_meshpreq(uint8_t *,
const struct ieee80211_meshpreq_ie *);
static uint8_t * hwmp_add_meshprep(uint8_t *,
const struct ieee80211_meshprep_ie *);
static uint8_t * hwmp_add_meshperr(uint8_t *,
const struct ieee80211_meshperr_ie *);
static uint8_t * hwmp_add_meshrann(uint8_t *,
const struct ieee80211_meshrann_ie *);
static void hwmp_rootmode_setup(struct ieee80211vap *);
static void hwmp_rootmode_cb(void *);
static void hwmp_rootmode_rann_cb(void *);
static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
const struct ieee80211_frame *,
const struct ieee80211_meshpreq_ie *);
static int hwmp_send_preq(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN],
struct ieee80211_meshpreq_ie *,
struct timeval *, struct timeval *);
static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
const struct ieee80211_frame *,
const struct ieee80211_meshprep_ie *);
static int hwmp_send_prep(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN],
struct ieee80211_meshprep_ie *);
static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
const struct ieee80211_frame *,
const struct ieee80211_meshperr_ie *);
static int hwmp_send_perr(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN],
struct ieee80211_meshperr_ie *);
static void hwmp_senderror(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN],
struct ieee80211_mesh_route *, int);
static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
const struct ieee80211_frame *,
const struct ieee80211_meshrann_ie *);
static int hwmp_send_rann(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN],
struct ieee80211_meshrann_ie *);
static struct ieee80211_node *
hwmp_discover(struct ieee80211vap *,
const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
static void hwmp_peerdown(struct ieee80211_node *);
static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
/* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] =
{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
typedef uint32_t ieee80211_hwmp_seq;
#define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0)
#define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0)
#define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0)
#define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0)
#define HWMP_SEQ_MAX(a, b) (a > b ? a : b)
/*
* Private extension of ieee80211_mesh_route.
*/
struct ieee80211_hwmp_route {
ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/
ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */
ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/
struct timeval hr_lastpreq; /* last time we sent a PREQ */
struct timeval hr_lastrootconf; /* last sent PREQ root conf */
int hr_preqretries; /* number of discoveries */
int hr_lastdiscovery; /* last discovery in ticks */
};
struct ieee80211_hwmp_state {
ieee80211_hwmp_seq hs_seq; /* next seq to be used */
ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */
int hs_rootmode; /* proactive HWMP */
struct timeval hs_lastperr; /* last time we sent a PERR */
struct callout hs_roottimer;
uint8_t hs_maxhops; /* max hop count */
};
static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD | CTLFLAG_MPSAFE, 0,
"IEEE 802.11s HWMP parameters");
static int ieee80211_hwmp_targetonly = 0;
SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW,
&ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
static int ieee80211_hwmp_pathtimeout = -1;
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
"path entry lifetime (ms)");
static int ieee80211_hwmp_maxpreq_retries = -1;
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I",
"maximum number of preq retries");
static int ieee80211_hwmp_net_diameter_traversaltime = -1;
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&ieee80211_hwmp_net_diameter_traversaltime, 0,
ieee80211_sysctl_msecs_ticks, "I",
"estimate travelse time across the MBSS (ms)");
static int ieee80211_hwmp_roottimeout = -1;
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
"root PREQ timeout (ms)");
static int ieee80211_hwmp_rootint = -1;
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
"root interval (ms)");
static int ieee80211_hwmp_rannint = -1;
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
&ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
"root announcement interval (ms)");
static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 };
static int ieee80211_hwmp_rootconfint_internal = -1;
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint,
CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
&ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I",
"root confirmation interval (ms) (read-only)");
#define IEEE80211_HWMP_DEFAULT_MAXHOPS 31
static ieee80211_recv_action_func hwmp_recv_action_meshpath;
static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
.mpp_descr = "HWMP",
.mpp_ie = IEEE80211_MESHCONF_PATH_HWMP,
.mpp_discover = hwmp_discover,
.mpp_peerdown = hwmp_peerdown,
.mpp_senderror = hwmp_senderror,
.mpp_vattach = hwmp_vattach,
.mpp_vdetach = hwmp_vdetach,
.mpp_newstate = hwmp_newstate,
.mpp_privlen = sizeof(struct ieee80211_hwmp_route),
};
SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact,
CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_NEEDGIANT,
&mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
"mesh route inactivity timeout (ms)");
static void
ieee80211_hwmp_init(void)
{
/* Default values as per amendment */
ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000);
ieee80211_hwmp_maxpreq_retries = 3;
/*
* (TU): A measurement of time equal to 1024 μs,
* 500 TU is 512 ms.
*/
ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512);
/*
* NB: I dont know how to make SYSCTL_PROC that calls ms to ticks
* and return a struct timeval...
*/
ieee80211_hwmp_rootconfint.tv_usec =
ieee80211_hwmp_rootconfint_internal * 1000;
/*
* Register action frame handler.
*/
ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH,
IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath);
/* NB: default is 5 secs per spec */
mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
/*
* Register HWMP.
*/
ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
}
SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
static void
hwmp_vattach(struct ieee80211vap *vap)
{
struct ieee80211_hwmp_state *hs;
KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
("not a mesh vap, opmode %d", vap->iv_opmode));
hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
if (hs == NULL) {
printf("%s: couldn't alloc HWMP state\n", __func__);
return;
}
hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
callout_init(&hs->hs_roottimer, 1);
vap->iv_hwmp = hs;
}
static void
hwmp_vdetach(struct ieee80211vap *vap)
{
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
callout_drain(&hs->hs_roottimer);
IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP);
vap->iv_hwmp = NULL;
}
static int
hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
{
enum ieee80211_state nstate = vap->iv_state;
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
__func__, ieee80211_state_name[ostate],
ieee80211_state_name[nstate], arg);
if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
callout_drain(&hs->hs_roottimer);
if (nstate == IEEE80211_S_RUN)
hwmp_rootmode_setup(vap);
return 0;
}
/*
* Verify the length of an HWMP PREQ and return the number
* of destinations >= 1, if verification fails -1 is returned.
*/
static int
verify_mesh_preq_len(struct ieee80211vap *vap,
const struct ieee80211_frame *wh, const uint8_t *iefrm)
{
int alloc_sz = -1;
int ndest = -1;
if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
/* Originator External Address present */
alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE;
ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
} else {
/* w/o Originator External Address */
alloc_sz = IEEE80211_MESHPREQ_BASE_SZ;
ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
}
alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
if(iefrm[1] != (alloc_sz)) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
wh, NULL, "PREQ (AE=%s) with wrong len",
iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0");
return (-1);
}
return ndest;
}
/*
* Verify the length of an HWMP PREP and returns 1 on success,
* otherwise -1.
*/
static int
verify_mesh_prep_len(struct ieee80211vap *vap,
const struct ieee80211_frame *wh, const uint8_t *iefrm)
{
int alloc_sz = -1;
if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
} else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
if(alloc_sz < 0) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
wh, NULL, "PREP (AE=%s) with wrong len",
iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0");
return (-1);
}
return (1);
}
/*
* Verify the length of an HWMP PERR and return the number
* of destinations >= 1, if verification fails -1 is returned.
*/
static int
verify_mesh_perr_len(struct ieee80211vap *vap,
const struct ieee80211_frame *wh, const uint8_t *iefrm)
{
int alloc_sz = -1;
const uint8_t *iefrm_t = iefrm;
uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
int i;
if(ndest > IEEE80211_MESHPERR_MAXDEST) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
wh, NULL, "PERR with wrong number of destionat (>19), %u",
ndest);
return (-1);
}
iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
/* We need to check each destionation flag to know size */
for(i = 0; i<ndest; i++) {
if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
else
iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
}
alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
if(alloc_sz != iefrm[1]) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
wh, NULL, "%s", "PERR with wrong len");
return (-1);
}
return ndest;
}
static int
hwmp_recv_action_meshpath(struct ieee80211_node *ni,
const struct ieee80211_frame *wh,
const uint8_t *frm, const uint8_t *efrm)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_meshpreq_ie *preq;
struct ieee80211_meshprep_ie *prep;
struct ieee80211_meshperr_ie *perr;
struct ieee80211_meshrann_ie rann;
const uint8_t *iefrm = frm + 2; /* action + code */
const uint8_t *iefrm_t = iefrm; /* temporary pointer */
int ndest = -1;
int found = 0;
while (efrm - iefrm > 1) {
IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
switch (*iefrm) {
case IEEE80211_ELEMID_MESHPREQ:
{
int i = 0;
iefrm_t = iefrm;
ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
if (ndest < 0) {
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
preq = IEEE80211_MALLOC(sizeof(*preq) +
(ndest - 1) * sizeof(*preq->preq_targets),
M_80211_MESH_PREQ,
IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
KASSERT(preq != NULL, ("preq == NULL"));
preq->preq_ie = *iefrm_t++;
preq->preq_len = *iefrm_t++;
preq->preq_flags = *iefrm_t++;
preq->preq_hopcount = *iefrm_t++;
preq->preq_ttl = *iefrm_t++;
preq->preq_id = le32dec(iefrm_t); iefrm_t += 4;
IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
iefrm_t += 6;
preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4;
/* NB: may have Originator Proxied Address */
if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
IEEE80211_ADDR_COPY(
preq->preq_orig_ext_addr, iefrm_t);
iefrm_t += 6;
}
preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4;
preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4;
preq->preq_tcount = *iefrm_t++;
for (i = 0; i < preq->preq_tcount; i++) {
preq->preq_targets[i].target_flags = *iefrm_t++;
IEEE80211_ADDR_COPY(
preq->preq_targets[i].target_addr, iefrm_t);
iefrm_t += 6;
preq->preq_targets[i].target_seq =
le32dec(iefrm_t);
iefrm_t += 4;
}
hwmp_recv_preq(vap, ni, wh, preq);
IEEE80211_FREE(preq, M_80211_MESH_PREQ);
found++;
break;
}
case IEEE80211_ELEMID_MESHPREP:
{
iefrm_t = iefrm;
ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
if (ndest < 0) {
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
prep = IEEE80211_MALLOC(sizeof(*prep),
M_80211_MESH_PREP,
IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
KASSERT(prep != NULL, ("prep == NULL"));
prep->prep_ie = *iefrm_t++;
prep->prep_len = *iefrm_t++;
prep->prep_flags = *iefrm_t++;
prep->prep_hopcount = *iefrm_t++;
prep->prep_ttl = *iefrm_t++;
IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
iefrm_t += 6;
prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4;
/* NB: May have Target Proxied Address */
if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
IEEE80211_ADDR_COPY(
prep->prep_target_ext_addr, iefrm_t);
iefrm_t += 6;
}
prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4;
prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4;
IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
iefrm_t += 6;
prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4;
hwmp_recv_prep(vap, ni, wh, prep);
IEEE80211_FREE(prep, M_80211_MESH_PREP);
found++;
break;
}
case IEEE80211_ELEMID_MESHPERR:
{
int i = 0;
iefrm_t = iefrm;
ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
if (ndest < 0) {
vap->iv_stats.is_rx_mgtdiscard++;
break;
}
perr = IEEE80211_MALLOC(sizeof(*perr) +
(ndest - 1) * sizeof(*perr->perr_dests),
M_80211_MESH_PERR,
IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
KASSERT(perr != NULL, ("perr == NULL"));
perr->perr_ie = *iefrm_t++;
perr->perr_len = *iefrm_t++;
perr->perr_ttl = *iefrm_t++;
perr->perr_ndests = *iefrm_t++;
for (i = 0; i<perr->perr_ndests; i++) {
perr->perr_dests[i].dest_flags = *iefrm_t++;
IEEE80211_ADDR_COPY(
perr->perr_dests[i].dest_addr, iefrm_t);
iefrm_t += 6;
perr->perr_dests[i].dest_seq = le32dec(iefrm_t);
iefrm_t += 4;
/* NB: May have Target Proxied Address */
if (perr->perr_dests[i].dest_flags &
IEEE80211_MESHPERR_FLAGS_AE) {
IEEE80211_ADDR_COPY(
perr->perr_dests[i].dest_ext_addr,
iefrm_t);
iefrm_t += 6;
}
perr->perr_dests[i].dest_rcode =
le16dec(iefrm_t);
iefrm_t += 2;
}
hwmp_recv_perr(vap, ni, wh, perr);
IEEE80211_FREE(perr, M_80211_MESH_PERR);
found++;
break;
}
case IEEE80211_ELEMID_MESHRANN:
{
const struct ieee80211_meshrann_ie *mrann =
(const struct ieee80211_meshrann_ie *) iefrm;
if (mrann->rann_len !=
sizeof(struct ieee80211_meshrann_ie) - 2) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
wh, NULL, "%s", "RAN with wrong len");
vap->iv_stats.is_rx_mgtdiscard++;
return 1;
}
memcpy(&rann, mrann, sizeof(rann));
rann.rann_seq = le32dec(&mrann->rann_seq);
rann.rann_interval = le32dec(&mrann->rann_interval);
rann.rann_metric = le32dec(&mrann->rann_metric);
hwmp_recv_rann(vap, ni, wh, &rann);
found++;
break;
}
}
iefrm += iefrm[1] + 2;
}
if (!found) {
IEEE80211_DISCARD(vap,
IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
wh, NULL, "%s", "PATH SEL action without IE");
vap->iv_stats.is_rx_mgtdiscard++;
}
return 0;
}
static int
hwmp_send_action(struct ieee80211vap *vap,
const uint8_t da[IEEE80211_ADDR_LEN],
uint8_t *ie, size_t len)
{
struct ieee80211_node *ni;
struct ieee80211com *ic;
struct ieee80211_bpf_params params;
struct mbuf *m;
uint8_t *frm;
int ret;
if (IEEE80211_IS_MULTICAST(da)) {
ni = ieee80211_ref_node(vap->iv_bss);
#ifdef IEEE80211_DEBUG_REFCNT
IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
"ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
__func__, __LINE__,
ni, ether_sprintf(ni->ni_macaddr),
ieee80211_node_refcnt(ni)+1);
#endif
ieee80211_ref_node(ni);
}
else
ni = ieee80211_mesh_find_txnode(vap, da);
if (vap->iv_state == IEEE80211_S_CAC) {
IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
"block %s frame in CAC state", "HWMP action");
vap->iv_stats.is_tx_badstate++;
return EIO; /* XXX */
}
KASSERT(ni != NULL, ("null node"));
ic = ni->ni_ic;
m = ieee80211_getmgtframe(&frm,
ic->ic_headroom + sizeof(struct ieee80211_frame),
sizeof(struct ieee80211_action) + len
);
if (m == NULL) {
ieee80211_free_node(ni);
vap->iv_stats.is_tx_nobuf++;
return ENOMEM;
}
*frm++ = IEEE80211_ACTION_CAT_MESH;
*frm++ = IEEE80211_ACTION_MESH_HWMP;
switch (*ie) {
case IEEE80211_ELEMID_MESHPREQ:
frm = hwmp_add_meshpreq(frm,
(struct ieee80211_meshpreq_ie *)ie);
break;
case IEEE80211_ELEMID_MESHPREP:
frm = hwmp_add_meshprep(frm,
(struct ieee80211_meshprep_ie *)ie);
break;
case IEEE80211_ELEMID_MESHPERR:
frm = hwmp_add_meshperr(frm,
(struct ieee80211_meshperr_ie *)ie);
break;
case IEEE80211_ELEMID_MESHRANN:
frm = hwmp_add_meshrann(frm,
(struct ieee80211_meshrann_ie *)ie);
break;
}
m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
if (m == NULL) {
ieee80211_free_node(ni);
vap->iv_stats.is_tx_nobuf++;
return ENOMEM;
}
IEEE80211_TX_LOCK(ic);
ieee80211_send_setup(ni, m,
IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr);
m->m_flags |= M_ENCAP; /* mark encapsulated */
IEEE80211_NODE_STAT(ni, tx_mgmt);
memset(&params, 0, sizeof(params));
params.ibp_pri = WME_AC_VO;
params.ibp_rate0 = ni->ni_txparms->mgmtrate;
if (IEEE80211_IS_MULTICAST(da))
params.ibp_try0 = 1;
else
params.ibp_try0 = ni->ni_txparms->maxretry;
params.ibp_power = ni->ni_txpower;
ret = ieee80211_raw_output(vap, ni, m, &params);
IEEE80211_TX_UNLOCK(ic);
return (ret);
}
#define ADDSHORT(frm, v) do { \
le16enc(frm, v); \
frm += 2; \
} while (0)
#define ADDWORD(frm, v) do { \
le32enc(frm, v); \
frm += 4; \
} while (0)
/*
* Add a Mesh Path Request IE to a frame.
*/
#define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
#define PREQ_TADDR(n) preq->preq_targets[n].target_addr
#define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
static uint8_t *
hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
{
int i;
*frm++ = IEEE80211_ELEMID_MESHPREQ;
*frm++ = preq->preq_len; /* len already calculated */
*frm++ = preq->preq_flags;
*frm++ = preq->preq_hopcount;
*frm++ = preq->preq_ttl;
ADDWORD(frm, preq->preq_id);
IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
ADDWORD(frm, preq->preq_origseq);
if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
frm += 6;
}
ADDWORD(frm, preq->preq_lifetime);
ADDWORD(frm, preq->preq_metric);
*frm++ = preq->preq_tcount;
for (i = 0; i < preq->preq_tcount; i++) {
*frm++ = PREQ_TFLAGS(i);
IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
frm += 6;
ADDWORD(frm, PREQ_TSEQ(i));
}
return frm;
}
#undef PREQ_TFLAGS
#undef PREQ_TADDR
#undef PREQ_TSEQ
/*
* Add a Mesh Path Reply IE to a frame.
*/
static uint8_t *
hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
{
*frm++ = IEEE80211_ELEMID_MESHPREP;
*frm++ = prep->prep_len; /* len already calculated */
*frm++ = prep->prep_flags;
*frm++ = prep->prep_hopcount;
*frm++ = prep->prep_ttl;
IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
ADDWORD(frm, prep->prep_targetseq);
if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
frm += 6;
}
ADDWORD(frm, prep->prep_lifetime);
ADDWORD(frm, prep->prep_metric);
IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
ADDWORD(frm, prep->prep_origseq);
return frm;
}
/*
* Add a Mesh Path Error IE to a frame.
*/
#define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
#define PERR_DADDR(n) perr->perr_dests[n].dest_addr
#define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
#define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
#define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode
static uint8_t *
hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
{
int i;
*frm++ = IEEE80211_ELEMID_MESHPERR;
*frm++ = perr->perr_len; /* len already calculated */
*frm++ = perr->perr_ttl;
*frm++ = perr->perr_ndests;
for (i = 0; i < perr->perr_ndests; i++) {
*frm++ = PERR_DFLAGS(i);
IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
frm += 6;
ADDWORD(frm, PERR_DSEQ(i));
if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
frm += 6;
}
ADDSHORT(frm, PERR_DRCODE(i));
}
return frm;
}
#undef PERR_DFLAGS
#undef PERR_DADDR
#undef PERR_DSEQ
#undef PERR_EXTADDR
#undef PERR_DRCODE
/*
* Add a Root Annoucement IE to a frame.
*/
static uint8_t *
hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
{
*frm++ = IEEE80211_ELEMID_MESHRANN;
*frm++ = rann->rann_len;
*frm++ = rann->rann_flags;
*frm++ = rann->rann_hopcount;
*frm++ = rann->rann_ttl;
IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
ADDWORD(frm, rann->rann_seq);
ADDWORD(frm, rann->rann_interval);
ADDWORD(frm, rann->rann_metric);
return frm;
}
static void
hwmp_rootmode_setup(struct ieee80211vap *vap)
{
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
struct ieee80211_mesh_state *ms = vap->iv_mesh;
switch (hs->hs_rootmode) {
case IEEE80211_HWMP_ROOTMODE_DISABLED:
callout_drain(&hs->hs_roottimer);
ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT;
break;
case IEEE80211_HWMP_ROOTMODE_NORMAL:
case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
hwmp_rootmode_cb, vap);
ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
break;
case IEEE80211_HWMP_ROOTMODE_RANN:
callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
hwmp_rootmode_rann_cb, vap);
ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
break;
}
}
/*
* Send a broadcast Path Request to find all nodes on the mesh. We are
* called when the vap is configured as a HWMP root node.
*/
#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
#define PREQ_TADDR(n) preq.preq_targets[n].target_addr
#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
static void
hwmp_rootmode_cb(void *arg)
{
struct ieee80211vap *vap = (struct ieee80211vap *)arg;
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_meshpreq_ie preq;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
"%s", "send broadcast PREQ");
preq.preq_flags = 0;
if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
preq.preq_hopcount = 0;
preq.preq_ttl = ms->ms_ttl;
preq.preq_id = ++hs->hs_preqid;
IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
preq.preq_origseq = ++hs->hs_seq;
preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
preq.preq_tcount = 1;
IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
IEEE80211_MESHPREQ_TFLAGS_USN;
PREQ_TSEQ(0) = 0;
vap->iv_stats.is_hwmp_rootreqs++;
/* NB: we enforce rate check ourself */
hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL);
hwmp_rootmode_setup(vap);
}
#undef PREQ_TFLAGS
#undef PREQ_TADDR
#undef PREQ_TSEQ
/*
* Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
* called when the vap is configured as a HWMP RANN root node.
*/
static void
hwmp_rootmode_rann_cb(void *arg)
{
struct ieee80211vap *vap = (struct ieee80211vap *)arg;
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_meshrann_ie rann;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
"%s", "send broadcast RANN");
rann.rann_flags = 0;
if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
rann.rann_hopcount = 0;
rann.rann_ttl = ms->ms_ttl;
IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
rann.rann_seq = ++hs->hs_seq;
rann.rann_interval = ieee80211_hwmp_rannint;
rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
vap->iv_stats.is_hwmp_rootrann++;
hwmp_send_rann(vap, broadcastaddr, &rann);
hwmp_rootmode_setup(vap);
}
/*
* Update forwarding information to TA if metric improves.
*/
static void
hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni,
const char *hwmp_frame)
{
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */
int metric = 0;
rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
if (rttran == NULL) {
rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr);
if (rttran == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"unable to add path to transmitter %6D of %s",
ni->ni_macaddr, ":", hwmp_frame);
vap->iv_stats.is_mesh_rtaddfailed++;
return;
}
}
metric = ms->ms_pmetric->mpm_metric(ni);
if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) ||
rttran->rt_metric > metric)
{
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"%s path to transmitter %6D of %s, metric %d:%d",
rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
"prefer" : "update", ni->ni_macaddr, ":", hwmp_frame,
rttran->rt_metric, metric);
IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr);
rttran->rt_metric = metric;
rttran->rt_nhops = 1;
ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact);
rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
}
}
#define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
#define PREQ_TADDR(n) preq->preq_targets[n].target_addr
#define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
static void
hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
{
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_mesh_route *rtorig = NULL;
struct ieee80211_mesh_route *rtorig_ext = NULL;
struct ieee80211_mesh_route *rttarg = NULL;
struct ieee80211_hwmp_route *hrorig = NULL;
struct ieee80211_hwmp_route *hrtarg = NULL;
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
ieee80211_hwmp_seq preqid; /* last seen preqid for orig */
uint32_t metric = 0;
/*
* Ignore PREQs from us. Could happen because someone forward it
* back to us.
*/
if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
return;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
PREQ_TADDR(0), ":");
/*
* Acceptance criteria: (if the PREQ is not for us or not broadcast,
* or an external mac address not proxied by us),
* AND forwarding is disabled, discard this PREQ.
*/
rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
(!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
!IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
(rttarg != NULL &&
rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
return;
}
/*
* Acceptance criteria: if unicast addressed
* AND no valid forwarding for Target of PREQ, discard this PREQ.
*/
if(rttarg != NULL)
hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
struct ieee80211_hwmp_route);
/* Address mode: ucast */
if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
rttarg == NULL &&
!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
preq->preq_origaddr, NULL,
"unicast addressed PREQ of unknown target %6D",
PREQ_TADDR(0), ":");
return;
}
/* PREQ ACCEPTED */
rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
if (rtorig == NULL) {
rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
if (rtorig == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"unable to add orig path to %6D",
preq->preq_origaddr, ":");
vap->iv_stats.is_mesh_rtaddfailed++;
return;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"adding originator %6D", preq->preq_origaddr, ":");
}
hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
/* record last seen preqid */
preqid = hrorig->hr_preqid;
hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
/* Data creation and update of forwarding information
* according to Table 11C-8 for originator mesh STA.
*/
metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
(HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
metric < rtorig->rt_metric)) {
hrorig->hr_seq = preq->preq_origseq;
IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
rtorig->rt_metric = metric;
rtorig->rt_nhops = preq->preq_hopcount + 1;
ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
/* Path to orig is valid now.
* NB: we know it can't be Proxy, and if it is GATE
* it will be marked below.
*/
rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
} else if ((hrtarg != NULL &&
!HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
(rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
preqid >= preq->preq_id)) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"discard PREQ from %6D, old seqno %u <= %u,"
" or old preqid %u < %u",
preq->preq_origaddr, ":",
preq->preq_origseq, hrorig->hr_seq,
preq->preq_id, preqid);
return;
}
/* Update forwarding information to TA if metric improves. */
hwmp_update_transmitter(vap, ni, "PREQ");
/*
* Check if the PREQ is addressed to us.
* or a Proxy currently gated by us.
*/
if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
(ms->ms_flags & IEEE80211_MESHFLAGS_GATE &&
rttarg != NULL &&
IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) &&
rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
struct ieee80211_meshprep_ie prep;
/*
* When we are the target we shall update our own HWMP seq
* number with max of (current and preq->seq) + 1
*/
hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
prep.prep_flags = 0;
prep.prep_hopcount = 0;
prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
if (rttarg != NULL && /* if NULL it means we are the target */
rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"reply for proxy %6D", rttarg->rt_dest, ":");
prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
rttarg->rt_dest);
/* update proxy seqno to HWMP seqno */
rttarg->rt_ext_seq = hs->hs_seq;
prep.prep_hopcount = rttarg->rt_nhops;
prep.prep_metric = rttarg->rt_metric;
IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
}
/*
* Build and send a PREP frame.
*/
prep.prep_ttl = ms->ms_ttl;
prep.prep_targetseq = hs->hs_seq;
prep.prep_lifetime = preq->preq_lifetime;
IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
prep.prep_origseq = preq->preq_origseq;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"reply to %6D", preq->preq_origaddr, ":");
hwmp_send_prep(vap, wh->i_addr2, &prep);
return;
}
/* we may update our proxy information for the orig external */
else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
rtorig_ext =
ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
if (rtorig_ext == NULL) {
rtorig_ext = ieee80211_mesh_rt_add(vap,
preq->preq_orig_ext_addr);
if (rtorig_ext == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"unable to add orig ext proxy to %6D",
preq->preq_orig_ext_addr, ":");
vap->iv_stats.is_mesh_rtaddfailed++;
return;
}
IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
preq->preq_origaddr);
}
rtorig_ext->rt_ext_seq = preq->preq_origseq;
ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
}
/*
* Proactive PREQ: reply with a proactive PREP to the
* root STA if requested.
*/
if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"root mesh station @ %6D", preq->preq_origaddr, ":");
/* Check if root is a mesh gate, mark it */
if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) {
struct ieee80211_mesh_gate_route *gr;
rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr,
rtorig);
gr->gr_lastseq = 0; /* NOT GANN */
}
/*
* Reply with a PREP if we don't have a path to the root
* or if the root sent us a proactive PREQ.
*/
if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
struct ieee80211_meshprep_ie prep;
prep.prep_flags = 0;
prep.prep_hopcount = 0;
prep.prep_ttl = ms->ms_ttl;
IEEE80211_ADDR_COPY(prep.prep_origaddr,
preq->preq_origaddr);
prep.prep_origseq = preq->preq_origseq;
prep.prep_lifetime = preq->preq_lifetime;
prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
IEEE80211_ADDR_COPY(prep.prep_targetaddr,
vap->iv_myaddr);
prep.prep_targetseq = ++hs->hs_seq;
hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
}
}
/*
* Forwarding and Intermediate reply for PREQs with 1 target.
*/
if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
memcpy(&ppreq, preq, sizeof(ppreq));
/*
* We have a valid route to this node.
* NB: if target is proxy dont reply.
*/
if (rttarg != NULL &&
rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
!(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
/*
* Check if we can send an intermediate Path Reply,
* i.e., Target Only bit is not set and target is not
* the MAC broadcast address.
*/
if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
!IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
struct ieee80211_meshprep_ie prep;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"intermediate reply for PREQ from %6D",
preq->preq_origaddr, ":");
prep.prep_flags = 0;
prep.prep_hopcount = rttarg->rt_nhops;
prep.prep_ttl = ms->ms_ttl;
IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
PREQ_TADDR(0));
prep.prep_targetseq = hrtarg->hr_seq;
prep.prep_lifetime = preq->preq_lifetime;
prep.prep_metric =rttarg->rt_metric;
IEEE80211_ADDR_COPY(&prep.prep_origaddr,
preq->preq_origaddr);
prep.prep_origseq = hrorig->hr_seq;
hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
/*
* Set TO and unset RF bits because we have
* sent a PREP.
*/
ppreq.preq_targets[0].target_flags |=
IEEE80211_MESHPREQ_TFLAGS_TO;
}
}
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"forward PREQ from %6D",
preq->preq_origaddr, ":");
ppreq.preq_hopcount += 1;
ppreq.preq_ttl -= 1;
ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
/* don't do PREQ ratecheck when we propagate */
hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL);
}
}
#undef PREQ_TFLAGS
#undef PREQ_TADDR
#undef PREQ_TSEQ
static int
hwmp_send_preq(struct ieee80211vap *vap,
const uint8_t da[IEEE80211_ADDR_LEN],
struct ieee80211_meshpreq_ie *preq,
struct timeval *last, struct timeval *minint)
{
/*
* Enforce PREQ interval.
* NB: Proactive ROOT PREQs rate is handled by cb task.
*/
if (last != NULL && minint != NULL) {
if (ratecheck(last, minint) == 0)
return EALREADY; /* XXX: we should postpone */
getmicrouptime(last);
}
/*
* mesh preq action frame format
* [6] da
* [6] sa
* [6] addr3 = sa
* [1] action
* [1] category
* [tlv] mesh path request
*/
preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2);
}
static void
hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
{
#define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
#define PROXIED_BY_US(rt) \
(IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
struct ieee80211_mesh_route *rt = NULL;
struct ieee80211_mesh_route *rtorig = NULL;
struct ieee80211_mesh_route *rtext = NULL;
struct ieee80211_hwmp_route *hr;
struct ieee80211com *ic = vap->iv_ic;
struct mbuf *m, *next;
uint32_t metric = 0;
const uint8_t *addr;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
prep->prep_targetaddr, ":");
/*
* Acceptance criteria: (If the corresponding PREP was not generated
* by us OR not generated by an external mac that is not proxied by us)
* AND forwarding is disabled, discard this PREP.
*/
rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
(rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"discard PREP, orig(%6D) not proxied or generated by us",
prep->prep_origaddr, ":");
return;
}
/* PREP ACCEPTED */
/*
* If accepted shall create or update the active forwarding information
* it maintains for the target mesh STA of the PREP (according to the
* rules defined in 13.10.8.4). If the conditions for creating or
* updating the forwarding information have not been met in those
* rules, no further steps are applied to the PREP.
*/
rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
if (rt == NULL) {
rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
if (rt == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"unable to add PREP path to %6D",
prep->prep_targetaddr, ":");
vap->iv_stats.is_mesh_rtaddfailed++;
return;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"adding target %6D", prep->prep_targetaddr, ":");
}
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
/* update path metric */
metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"discard PREP from %6D, old seq no %u < %u",
prep->prep_targetaddr, ":",
prep->prep_targetseq, hr->hr_seq);
return;
} else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
metric > rt->rt_metric) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"discard PREP from %6D, new metric %u > %u",
prep->prep_targetaddr, ":",
metric, rt->rt_metric);
return;
}
}
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"%s path to %6D, hopcount %d:%d metric %d:%d",
rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
"prefer" : "update",
prep->prep_targetaddr, ":",
rt->rt_nhops, prep->prep_hopcount + 1,
rt->rt_metric, metric);
hr->hr_seq = prep->prep_targetseq;
hr->hr_preqretries = 0;
IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
rt->rt_metric = metric;
rt->rt_nhops = prep->prep_hopcount + 1;
ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
/* discovery complete */
rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
}
rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
/* Update forwarding information to TA if metric improves */
hwmp_update_transmitter(vap, ni, "PREP");
/*
* If it's NOT for us, propagate the PREP
*/
if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
prep->prep_ttl > 1 &&
prep->prep_hopcount < hs->hs_maxhops) {
struct ieee80211_meshprep_ie pprep; /* propagated PREP */
/*
* NB: We should already have setup the path to orig
* mesh STA when we propagated PREQ to target mesh STA,
* no PREP is generated without a corresponding PREQ.
* XXX: for now just ignore.
*/
if (rtorig == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"received PREP for an unknown orig(%6D)",
prep->prep_origaddr, ":");
return;
}
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"propagate PREP from %6D",
prep->prep_targetaddr, ":");
memcpy(&pprep, prep, sizeof(pprep));
pprep.prep_hopcount += 1;
pprep.prep_ttl -= 1;
pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep);
/* precursor list for the Target Mesh STA Address is updated */
}
/*
* Check if we received a PREP w/ AE and store target external address.
* We may store target external address if recevied PREP w/ AE
* and we are not final destination
*/
if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
rtext = ieee80211_mesh_rt_find(vap,
prep->prep_target_ext_addr);
if (rtext == NULL) {
rtext = ieee80211_mesh_rt_add(vap,
prep->prep_target_ext_addr);
if (rtext == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"unable to add PREP path to proxy %6D",
prep->prep_targetaddr, ":");
vap->iv_stats.is_mesh_rtaddfailed++;
return;
}
}
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"%s path to %6D, hopcount %d:%d metric %d:%d",
rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
"prefer" : "update",
prep->prep_target_ext_addr, ":",
rtext->rt_nhops, prep->prep_hopcount + 1,
rtext->rt_metric, metric);
rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
IEEE80211_MESHRT_FLAGS_VALID;
IEEE80211_ADDR_COPY(rtext->rt_dest,
prep->prep_target_ext_addr);
IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
prep->prep_targetaddr);
IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
rtext->rt_metric = metric;
rtext->rt_lifetime = prep->prep_lifetime;
rtext->rt_nhops = prep->prep_hopcount + 1;
rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
/*
* XXX: proxy entries have no HWMP priv data,
* nullify them to be sure?
*/
}
/*
* Check for frames queued awaiting path discovery.
* XXX probably can tell exactly and avoid remove call
* NB: hash may have false matches, if so they will get
* stuck back on the stageq because there won't be
* a path.
*/
addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
prep->prep_target_ext_addr : prep->prep_targetaddr;
m = ieee80211_ageq_remove(&ic->ic_stageq,
(struct ieee80211_node *)(uintptr_t)
ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
/*
* All frames in the stageq here should be non-M_ENCAP; or things
* will get very unhappy.
*/
for (; m != NULL; m = next) {
next = m->m_nextpkt;
m->m_nextpkt = NULL;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"flush queued frame %p len %d", m, m->m_pkthdr.len);
/*
* If the mbuf has M_ENCAP set, ensure we free it.
* Note that after if_transmit() is called, m is invalid.
*/
(void) ieee80211_vap_xmitpkt(vap, m);
}
#undef IS_PROXY
#undef PROXIED_BY_US
}
static int
hwmp_send_prep(struct ieee80211vap *vap,
const uint8_t da[IEEE80211_ADDR_LEN],
struct ieee80211_meshprep_ie *prep)
{
/* NB: there's no PREP minimum interval. */
/*
* mesh prep action frame format
* [6] da
* [6] sa
* [6] addr3 = sa
* [1] action
* [1] category
* [tlv] mesh path reply
*/
prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2);
}
#define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
#define PERR_DADDR(n) perr.perr_dests[n].dest_addr
#define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
#define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
static void
hwmp_peerdown(struct ieee80211_node *ni)
{
struct ieee80211vap *vap = ni->ni_vap;
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_meshperr_ie perr;
struct ieee80211_mesh_route *rt;
struct ieee80211_hwmp_route *hr;
rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
if (rt == NULL)
return;
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"%s", "delete route entry");
perr.perr_ttl = ms->ms_ttl;
perr.perr_ndests = 1;
PERR_DFLAGS(0) = 0;
if (hr->hr_seq == 0)
PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
PERR_DSEQ(0) = ++hr->hr_seq;
PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
/* NB: flush everything passing through peer */
ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
hwmp_send_perr(vap, broadcastaddr, &perr);
}
#undef PERR_DFLAGS
#undef PERR_DADDR
#undef PERR_DSEQ
#undef PERR_DRCODE
#define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
#define PERR_DADDR(n) perr->perr_dests[n].dest_addr
#define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
#define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr
static void
hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
{
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_mesh_route *rt = NULL;
struct ieee80211_mesh_route *rt_ext = NULL;
struct ieee80211_hwmp_route *hr;
struct ieee80211_meshperr_ie *pperr = NULL;
int i, j = 0, forward = 0;
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"received PERR from %6D", wh->i_addr2, ":");
/*
* if forwarding is true, prepare pperr
*/
if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
forward = 1;
pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */
}
/*
* Acceptance criteria: check if we have forwarding information
* stored about destination, and that nexthop == TA of this PERR.
* NB: we also build a new PERR to propagate in case we should forward.
*/
for (i = 0; i < perr->perr_ndests; i++) {
rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
if (rt == NULL)
continue;
if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
continue;
/* found and accepted a PERR ndest element, process it... */
if (forward)
memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
sizeof(*perr->perr_dests));
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
switch(PERR_DFLAGS(i)) {
case (IEEE80211_REASON_MESH_PERR_NO_FI):
if (PERR_DSEQ(i) == 0) {
hr->hr_seq++;
if (forward) {
pperr->perr_dests[j].dest_seq =
hr->hr_seq;
}
} else {
hr->hr_seq = PERR_DSEQ(i);
}
rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
j++;
break;
case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
hr->hr_seq = PERR_DSEQ(i);
rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
j++;
}
break;
case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
if (rt_ext != NULL) {
rt_ext->rt_flags &=
~IEEE80211_MESHRT_FLAGS_VALID;
j++;
}
break;
default:
IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
"PERR, unknown reason code %u\n", PERR_DFLAGS(i));
goto done; /* XXX: stats?? */
}
ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i));
KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
}
if (j == 0) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
"PERR not accepted");
goto done; /* XXX: stats?? */
}
/*
* Propagate the PERR if we previously found it on our routing table.
*/
if (forward && perr->perr_ttl > 1) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
"propagate PERR from %6D", wh->i_addr2, ":");
pperr->perr_ndests = j;
pperr->perr_ttl--;
hwmp_send_perr(vap, broadcastaddr, pperr);
}
done:
if (pperr != NULL)
IEEE80211_FREE(pperr, M_80211_MESH_PERR);
}
#undef PERR_DFLAGS
#undef PERR_DADDR
#undef PERR_DSEQ
#undef PERR_DEXTADDR
static int
hwmp_send_perr(struct ieee80211vap *vap,
const uint8_t da[IEEE80211_ADDR_LEN],
struct ieee80211_meshperr_ie *perr)
{
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
int i;
uint8_t length = 0;
/*
* Enforce PERR interval.
*/
if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
return EALREADY;
getmicrouptime(&hs->hs_lastperr);
/*
* mesh perr action frame format
* [6] da
* [6] sa
* [6] addr3 = sa
* [1] action
* [1] category
* [tlv] mesh path error
*/
perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
length = IEEE80211_MESHPERR_BASE_SZ;
for (i = 0; i<perr->perr_ndests; i++) {
if (perr->perr_dests[i].dest_flags &
IEEE80211_MESHPERR_FLAGS_AE) {
length += IEEE80211_MESHPERR_DEST_SZ_AE;
continue ;
}
length += IEEE80211_MESHPERR_DEST_SZ;
}
perr->perr_len =length;
return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2);
}
/*
* Called from the rest of the net80211 code (mesh code for example).
* NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
* a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
*/
#define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
#define PERR_DADDR(n) perr.perr_dests[n].dest_addr
#define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
#define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr
#define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
static void
hwmp_senderror(struct ieee80211vap *vap,
const uint8_t addr[IEEE80211_ADDR_LEN],
struct ieee80211_mesh_route *rt, int rcode)
{
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_hwmp_route *hr = NULL;
struct ieee80211_meshperr_ie perr;
if (rt != NULL)
hr = IEEE80211_MESH_ROUTE_PRIV(rt,
struct ieee80211_hwmp_route);
perr.perr_ndests = 1;
perr.perr_ttl = ms->ms_ttl;
PERR_DFLAGS(0) = 0;
PERR_DRCODE(0) = rcode;
switch (rcode) {
case IEEE80211_REASON_MESH_PERR_NO_FI:
IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
PERR_DSEQ(0) = 0; /* reserved */
break;
case IEEE80211_REASON_MESH_PERR_NO_PROXY:
KASSERT(rt != NULL, ("no proxy info for sending PERR"));
KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
("route is not marked proxy"));
PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
PERR_DSEQ(0) = rt->rt_ext_seq;
IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
break;
case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
KASSERT(rt != NULL, ("no route info for sending PERR"));
IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
PERR_DSEQ(0) = hr->hr_seq;
break;
default:
KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
}
hwmp_send_perr(vap, broadcastaddr, &perr);
}
#undef PERR_DFLAGS
#undef PEER_DADDR
#undef PERR_DSEQ
#undef PERR_DEXTADDR
#undef PERR_DRCODE
static void
hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
{
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
struct ieee80211_mesh_route *rt = NULL;
struct ieee80211_hwmp_route *hr;
struct ieee80211_meshpreq_ie preq;
struct ieee80211_meshrann_ie prann;
if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
return;
rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
/* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
"RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
return;
}
/* Acceptance criteria: if RANN.seq == stored seq AND
* RANN.metric > stored metric, discard RANN */
if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
rann->rann_metric > rt->rt_metric) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
"RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
return;
}
}
/* RANN ACCEPTED */
ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
if (rt == NULL) {
rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
if (rt == NULL) {
IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
"unable to add mac for RANN root %6D",
rann->rann_addr, ":");
vap->iv_stats.is_mesh_rtaddfailed++;
return;
}
}
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
/* Check if root is a mesh gate, mark it */
if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) {
struct ieee80211_mesh_gate_route *gr;
rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr,
rt);
gr->gr_lastseq = 0; /* NOT GANN */
}
/* discovery timeout */
ieee80211_mesh_rt_update(rt,
ticks_to_msecs(ieee80211_hwmp_roottimeout));
preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
preq.preq_hopcount = 0;
preq.preq_ttl = ms->ms_ttl;
preq.preq_id = 0; /* reserved */
IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
preq.preq_origseq = ++hs->hs_seq;
preq.preq_lifetime = ieee80211_hwmp_roottimeout;
preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
preq.preq_tcount = 1;
preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
/* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
preq.preq_targets[0].target_seq = rann->rann_seq;
/* XXX: if rootconfint have not passed, we built this preq in vain */
hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf,
&ieee80211_hwmp_rootconfint);
/* propagate a RANN */
if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
rann->rann_ttl > 1 &&
ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
hr->hr_seq = rann->rann_seq;
memcpy(&prann, rann, sizeof(prann));
prann.rann_hopcount += 1;
prann.rann_ttl -= 1;
prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
hwmp_send_rann(vap, broadcastaddr, &prann);
}
}
static int
hwmp_send_rann(struct ieee80211vap *vap,
const uint8_t da[IEEE80211_ADDR_LEN],
struct ieee80211_meshrann_ie *rann)
{
/*
* mesh rann action frame format
* [6] da
* [6] sa
* [6] addr3 = sa
* [1] action
* [1] category
* [tlv] root annoucement
*/
rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2);
}
#define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
#define PREQ_TADDR(n) preq.preq_targets[n].target_addr
#define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
static void
hwmp_rediscover_cb(void *arg)
{
struct ieee80211_mesh_route *rt = arg;
struct ieee80211vap *vap = rt->rt_vap;
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_hwmp_route *hr;
struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
return ; /* nothing to do */
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
if (hr->hr_preqretries >=
ieee80211_hwmp_maxpreq_retries) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY,
rt->rt_dest, "%s",
"max number of discovery, send queued frames to GATE");
ieee80211_mesh_forward_to_gates(vap, rt);
vap->iv_stats.is_mesh_fwd_nopath++;
return ; /* XXX: flush queue? */
}
hr->hr_preqretries++;
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
"start path rediscovery , target seq %u", hr->hr_seq);
/*
* Try to discover the path for this node.
* Group addressed PREQ Case A
*/
preq.preq_flags = 0;
preq.preq_hopcount = 0;
preq.preq_ttl = ms->ms_ttl;
preq.preq_id = ++hs->hs_preqid;
IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
preq.preq_origseq = hr->hr_origseq;
preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
preq.preq_tcount = 1;
IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
PREQ_TFLAGS(0) = 0;
if (ieee80211_hwmp_targetonly)
PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
/* XXX check return value */
hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq,
&ieee80211_hwmp_preqminint);
callout_reset(&rt->rt_discovery,
ieee80211_hwmp_net_diameter_traversaltime * 2,
hwmp_rediscover_cb, rt);
}
static struct ieee80211_node *
hwmp_discover(struct ieee80211vap *vap,
const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
{
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
struct ieee80211_mesh_state *ms = vap->iv_mesh;
struct ieee80211_mesh_route *rt = NULL;
struct ieee80211_hwmp_route *hr;
struct ieee80211_meshpreq_ie preq;
struct ieee80211_node *ni;
int sendpreq = 0;
KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
("not a mesh vap, opmode %d", vap->iv_opmode));
KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
("%s: discovering self!", __func__));
ni = NULL;
if (!IEEE80211_IS_MULTICAST(dest)) {
rt = ieee80211_mesh_rt_find(vap, dest);
if (rt == NULL) {
rt = ieee80211_mesh_rt_add(vap, dest);
if (rt == NULL) {
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
ni, "unable to add discovery path to %6D",
dest, ":");
vap->iv_stats.is_mesh_rtaddfailed++;
goto done;
}
}
hr = IEEE80211_MESH_ROUTE_PRIV(rt,
struct ieee80211_hwmp_route);
if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
"%s", "already discovering queue frame until path found");
sendpreq = 1;
goto done;
}
if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
if (hr->hr_lastdiscovery != 0 &&
(ticks - hr->hr_lastdiscovery <
(ieee80211_hwmp_net_diameter_traversaltime * 2))) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
dest, NULL, "%s",
"too frequent discovery requeust");
sendpreq = 1;
goto done;
}
hr->hr_lastdiscovery = ticks;
if (hr->hr_preqretries >=
ieee80211_hwmp_maxpreq_retries) {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
dest, NULL, "%s",
"no valid path , max number of discovery");
vap->iv_stats.is_mesh_fwd_nopath++;
goto done;
}
rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
hr->hr_preqretries++;
if (hr->hr_origseq == 0)
hr->hr_origseq = ++hs->hs_seq;
rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
sendpreq = 1;
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
"start path discovery (src %s), target seq %u",
m == NULL ? "<none>" : ether_sprintf(
mtod(m, struct ether_header *)->ether_shost),
hr->hr_seq);
/*
* Try to discover the path for this node.
* Group addressed PREQ Case A
*/
preq.preq_flags = 0;
preq.preq_hopcount = 0;
preq.preq_ttl = ms->ms_ttl;
preq.preq_id = ++hs->hs_preqid;
IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
preq.preq_origseq = hr->hr_origseq;
preq.preq_lifetime =
ticks_to_msecs(ieee80211_hwmp_pathtimeout);
preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
preq.preq_tcount = 1;
IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
PREQ_TFLAGS(0) = 0;
if (ieee80211_hwmp_targetonly)
PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
/* XXX check return value */
hwmp_send_preq(vap, broadcastaddr, &preq,
&hr->hr_lastpreq, &ieee80211_hwmp_preqminint);
callout_reset(&rt->rt_discovery,
ieee80211_hwmp_net_diameter_traversaltime * 2,
hwmp_rediscover_cb, rt);
}
if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
} else {
ni = ieee80211_find_txnode(vap, dest);
/* NB: if null then we leak mbuf */
KASSERT(ni != NULL, ("leak mcast frame"));
return ni;
}
done:
if (ni == NULL && m != NULL) {
if (sendpreq) {
struct ieee80211com *ic = vap->iv_ic;
/*
* Queue packet for transmit when path discovery
* completes. If discovery never completes the
* frame will be flushed by way of the aging timer.
*/
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
"%s", "queue frame until path found");
MPASS((m->m_pkthdr.csum_flags & CSUM_SND_TAG) == 0);
m->m_pkthdr.rcvif = (void *)(uintptr_t)
ieee80211_mac_hash(ic, dest);
/* XXX age chosen randomly */
ieee80211_ageq_append(&ic->ic_stageq, m,
IEEE80211_INACT_WAIT);
} else {
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
dest, NULL, "%s", "no valid path to this node");
m_freem(m);
}
}
return ni;
}
#undef PREQ_TFLAGS
#undef PREQ_TADDR
#undef PREQ_TSEQ
static int
hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
{
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
int error;
if (vap->iv_opmode != IEEE80211_M_MBSS)
return ENOSYS;
error = 0;
switch (ireq->i_type) {
case IEEE80211_IOC_HWMP_ROOTMODE:
ireq->i_val = hs->hs_rootmode;
break;
case IEEE80211_IOC_HWMP_MAXHOPS:
ireq->i_val = hs->hs_maxhops;
break;
default:
return ENOSYS;
}
return error;
}
IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
static int
hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
{
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
int error;
if (vap->iv_opmode != IEEE80211_M_MBSS)
return ENOSYS;
error = 0;
switch (ireq->i_type) {
case IEEE80211_IOC_HWMP_ROOTMODE:
if (ireq->i_val < 0 || ireq->i_val > 3)
return EINVAL;
hs->hs_rootmode = ireq->i_val;
hwmp_rootmode_setup(vap);
break;
case IEEE80211_IOC_HWMP_MAXHOPS:
if (ireq->i_val <= 0 || ireq->i_val > 255)
return EINVAL;
hs->hs_maxhops = ireq->i_val;
break;
default:
return ENOSYS;
}
return error;
}
IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);
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