1435 lines
45 KiB
C
1435 lines
45 KiB
C
/*-
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* Copyright (c) 2009 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Rui Paulo under sponsorship from the
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* FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifdef __FreeBSD__
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__FBSDID("$FreeBSD$");
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#endif
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/*
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* IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP.
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*
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* Based on March 2009, D3.0 802.11s draft spec.
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*/
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#include "opt_inet.h"
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#include "opt_wlan.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/socket.h>
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#include <sys/sockio.h>
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#include <sys/endian.h>
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#include <sys/errno.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_media.h>
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#include <net/if_llc.h>
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#include <net/ethernet.h>
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#include <net/bpf.h>
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#include <net80211/ieee80211_var.h>
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#include <net80211/ieee80211_action.h>
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#include <net80211/ieee80211_input.h>
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#include <net80211/ieee80211_mesh.h>
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static void hwmp_vattach(struct ieee80211vap *);
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static void hwmp_vdetach(struct ieee80211vap *);
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static int hwmp_newstate(struct ieee80211vap *,
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enum ieee80211_state, int);
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static int hwmp_send_action(struct ieee80211_node *,
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const uint8_t [IEEE80211_ADDR_LEN],
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const uint8_t [IEEE80211_ADDR_LEN],
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uint8_t *, size_t);
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static uint8_t * hwmp_add_meshpreq(uint8_t *,
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const struct ieee80211_meshpreq_ie *);
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static uint8_t * hwmp_add_meshprep(uint8_t *,
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const struct ieee80211_meshprep_ie *);
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static uint8_t * hwmp_add_meshperr(uint8_t *,
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const struct ieee80211_meshperr_ie *);
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static uint8_t * hwmp_add_meshrann(uint8_t *,
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const struct ieee80211_meshrann_ie *);
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static void hwmp_rootmode_setup(struct ieee80211vap *);
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static void hwmp_rootmode_cb(void *);
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static void hwmp_rootmode_rann_cb(void *);
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static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
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const struct ieee80211_frame *,
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const struct ieee80211_meshpreq_ie *);
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static int hwmp_send_preq(struct ieee80211_node *,
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const uint8_t [IEEE80211_ADDR_LEN],
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const uint8_t [IEEE80211_ADDR_LEN],
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struct ieee80211_meshpreq_ie *);
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static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
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const struct ieee80211_frame *,
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const struct ieee80211_meshprep_ie *);
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static int hwmp_send_prep(struct ieee80211_node *,
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const uint8_t [IEEE80211_ADDR_LEN],
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const uint8_t [IEEE80211_ADDR_LEN],
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struct ieee80211_meshprep_ie *);
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static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
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const struct ieee80211_frame *,
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const struct ieee80211_meshperr_ie *);
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static int hwmp_send_perr(struct ieee80211_node *,
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const uint8_t [IEEE80211_ADDR_LEN],
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const uint8_t [IEEE80211_ADDR_LEN],
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struct ieee80211_meshperr_ie *);
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static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
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const struct ieee80211_frame *,
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const struct ieee80211_meshrann_ie *);
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static int hwmp_send_rann(struct ieee80211_node *,
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const uint8_t [IEEE80211_ADDR_LEN],
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const uint8_t [IEEE80211_ADDR_LEN],
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struct ieee80211_meshrann_ie *);
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static struct ieee80211_node *
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hwmp_discover(struct ieee80211vap *,
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const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
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static void hwmp_peerdown(struct ieee80211_node *);
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static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
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static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
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/* unalligned little endian access */
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#define LE_WRITE_2(p, v) do { \
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((uint8_t *)(p))[0] = (v) & 0xff; \
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((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \
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} while (0)
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#define LE_WRITE_4(p, v) do { \
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((uint8_t *)(p))[0] = (v) & 0xff; \
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((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \
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((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \
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((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \
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} while (0)
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/* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
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static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] =
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{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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typedef uint32_t ieee80211_hwmp_seq;
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#define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0)
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#define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0)
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#define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0)
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#define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0)
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/*
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* Private extension of ieee80211_mesh_route.
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*/
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struct ieee80211_hwmp_route {
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ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/
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ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */
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ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/
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int hr_preqretries;
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};
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struct ieee80211_hwmp_state {
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ieee80211_hwmp_seq hs_seq; /* next seq to be used */
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ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */
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struct timeval hs_lastpreq; /* last time we sent a PREQ */
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struct timeval hs_lastperr; /* last time we sent a PERR */
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int hs_rootmode; /* proactive HWMP */
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struct callout hs_roottimer;
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uint8_t hs_maxhops; /* max hop count */
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};
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SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
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"IEEE 802.11s HWMP parameters");
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static int ieee80211_hwmp_targetonly = 0;
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SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW,
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&ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
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static int ieee80211_hwmp_replyforward = 1;
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SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, replyforward, CTLTYPE_INT | CTLFLAG_RW,
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&ieee80211_hwmp_replyforward, 0, "Set RF bit on generated PREQs");
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static int ieee80211_hwmp_pathtimeout = -1;
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SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
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&ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
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"path entry lifetime (ms)");
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static int ieee80211_hwmp_roottimeout = -1;
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SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
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&ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
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"root PREQ timeout (ms)");
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static int ieee80211_hwmp_rootint = -1;
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SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
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&ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
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"root interval (ms)");
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static int ieee80211_hwmp_rannint = -1;
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SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
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&ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
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"root announcement interval (ms)");
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#define IEEE80211_HWMP_DEFAULT_MAXHOPS 31
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static ieee80211_recv_action_func hwmp_recv_action_meshpath;
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static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
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.mpp_descr = "HWMP",
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.mpp_ie = IEEE80211_MESHCONF_PATH_HWMP,
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.mpp_discover = hwmp_discover,
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.mpp_peerdown = hwmp_peerdown,
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.mpp_vattach = hwmp_vattach,
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.mpp_vdetach = hwmp_vdetach,
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.mpp_newstate = hwmp_newstate,
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.mpp_privlen = sizeof(struct ieee80211_hwmp_route),
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};
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SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
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&mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
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"mesh route inactivity timeout (ms)");
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static void
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ieee80211_hwmp_init(void)
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{
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ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
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ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
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ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
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ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
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/*
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* Register action frame handler.
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*/
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ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH,
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IEEE80211_ACTION_MESHPATH_SEL, hwmp_recv_action_meshpath);
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/* NB: default is 5 secs per spec */
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mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
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/*
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* Register HWMP.
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*/
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ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
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}
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SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
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void
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hwmp_vattach(struct ieee80211vap *vap)
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{
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struct ieee80211_hwmp_state *hs;
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KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
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("not a mesh vap, opmode %d", vap->iv_opmode));
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hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
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M_NOWAIT | M_ZERO);
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if (hs == NULL) {
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printf("%s: couldn't alloc HWMP state\n", __func__);
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return;
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}
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hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
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callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE);
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vap->iv_hwmp = hs;
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}
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void
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hwmp_vdetach(struct ieee80211vap *vap)
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{
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struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
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callout_drain(&hs->hs_roottimer);
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free(vap->iv_hwmp, M_80211_VAP);
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vap->iv_hwmp = NULL;
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}
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int
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hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
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{
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enum ieee80211_state nstate = vap->iv_state;
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struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
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IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
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__func__, ieee80211_state_name[ostate],
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ieee80211_state_name[nstate], arg);
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if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
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callout_drain(&hs->hs_roottimer);
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if (nstate == IEEE80211_S_RUN)
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hwmp_rootmode_setup(vap);
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return 0;
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}
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static int
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hwmp_recv_action_meshpath(struct ieee80211_node *ni,
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const struct ieee80211_frame *wh,
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const uint8_t *frm, const uint8_t *efrm)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211_meshpreq_ie preq;
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struct ieee80211_meshprep_ie prep;
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struct ieee80211_meshperr_ie perr;
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struct ieee80211_meshrann_ie rann;
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const uint8_t *iefrm = frm + 2; /* action + code */
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int found = 0;
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while (efrm - iefrm > 1) {
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IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
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switch (*iefrm) {
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case IEEE80211_ELEMID_MESHPREQ:
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{
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const struct ieee80211_meshpreq_ie *mpreq =
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(const struct ieee80211_meshpreq_ie *) iefrm;
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/* XXX > 1 target */
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if (mpreq->preq_len !=
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sizeof(struct ieee80211_meshpreq_ie) - 2) {
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IEEE80211_DISCARD(vap,
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IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
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wh, NULL, "%s", "PREQ with wrong len");
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vap->iv_stats.is_rx_mgtdiscard++;
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break;
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}
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memcpy(&preq, mpreq, sizeof(preq));
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preq.preq_id = LE_READ_4(&mpreq->preq_id);
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preq.preq_origseq = LE_READ_4(&mpreq->preq_origseq);
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preq.preq_lifetime = LE_READ_4(&mpreq->preq_lifetime);
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preq.preq_metric = LE_READ_4(&mpreq->preq_metric);
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preq.preq_targets[0].target_seq =
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LE_READ_4(&mpreq->preq_targets[0].target_seq);
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hwmp_recv_preq(vap, ni, wh, &preq);
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found++;
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break;
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}
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case IEEE80211_ELEMID_MESHPREP:
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{
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const struct ieee80211_meshprep_ie *mprep =
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(const struct ieee80211_meshprep_ie *) iefrm;
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if (mprep->prep_len !=
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sizeof(struct ieee80211_meshprep_ie) - 2) {
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IEEE80211_DISCARD(vap,
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IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
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wh, NULL, "%s", "PREP with wrong len");
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vap->iv_stats.is_rx_mgtdiscard++;
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break;
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}
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memcpy(&prep, mprep, sizeof(prep));
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prep.prep_targetseq = LE_READ_4(&mprep->prep_targetseq);
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prep.prep_lifetime = LE_READ_4(&mprep->prep_lifetime);
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prep.prep_metric = LE_READ_4(&mprep->prep_metric);
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prep.prep_origseq = LE_READ_4(&mprep->prep_origseq);
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hwmp_recv_prep(vap, ni, wh, &prep);
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found++;
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break;
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}
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case IEEE80211_ELEMID_MESHPERR:
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{
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const struct ieee80211_meshperr_ie *mperr =
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(const struct ieee80211_meshperr_ie *) iefrm;
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/* XXX > 1 target */
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if (mperr->perr_len !=
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sizeof(struct ieee80211_meshperr_ie) - 2) {
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IEEE80211_DISCARD(vap,
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IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
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wh, NULL, "%s", "PERR with wrong len");
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vap->iv_stats.is_rx_mgtdiscard++;
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break;
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}
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memcpy(&perr, mperr, sizeof(perr));
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perr.perr_dests[0].dest_seq =
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LE_READ_4(&mperr->perr_dests[0].dest_seq);
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hwmp_recv_perr(vap, ni, wh, &perr);
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found++;
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break;
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}
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case IEEE80211_ELEMID_MESHRANN:
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{
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const struct ieee80211_meshrann_ie *mrann =
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(const struct ieee80211_meshrann_ie *) iefrm;
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if (mrann->rann_len !=
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sizeof(struct ieee80211_meshrann_ie) - 2) {
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IEEE80211_DISCARD(vap,
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IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
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wh, NULL, "%s", "RAN with wrong len");
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vap->iv_stats.is_rx_mgtdiscard++;
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return 1;
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}
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memcpy(&rann, mrann, sizeof(rann));
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rann.rann_seq = LE_READ_4(&mrann->rann_seq);
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rann.rann_metric = LE_READ_4(&mrann->rann_metric);
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hwmp_recv_rann(vap, ni, wh, &rann);
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found++;
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break;
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}
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}
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iefrm += iefrm[1] + 2;
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}
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if (!found) {
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IEEE80211_DISCARD(vap,
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IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
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wh, NULL, "%s", "PATH SEL action without IE");
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vap->iv_stats.is_rx_mgtdiscard++;
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}
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return 0;
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}
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static int
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hwmp_send_action(struct ieee80211_node *ni,
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const uint8_t sa[IEEE80211_ADDR_LEN],
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const uint8_t da[IEEE80211_ADDR_LEN],
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uint8_t *ie, size_t len)
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{
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struct ieee80211vap *vap = ni->ni_vap;
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struct ieee80211com *ic = ni->ni_ic;
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struct ieee80211_bpf_params params;
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struct mbuf *m;
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uint8_t *frm;
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if (vap->iv_state == IEEE80211_S_CAC) {
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IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
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"block %s frame in CAC state", "HWMP action");
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vap->iv_stats.is_tx_badstate++;
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return EIO; /* XXX */
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}
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KASSERT(ni != NULL, ("null node"));
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/*
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* Hold a reference on the node so it doesn't go away until after
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* the xmit is complete all the way in the driver. On error we
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* will remove our reference.
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*/
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#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);
|
|
|
|
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_MESHPATH;
|
|
*frm++ = IEEE80211_ACTION_MESHPATH_SEL;
|
|
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_DONTWAIT);
|
|
if (m == NULL) {
|
|
ieee80211_free_node(ni);
|
|
vap->iv_stats.is_tx_nobuf++;
|
|
return ENOMEM;
|
|
}
|
|
ieee80211_send_setup(ni, m,
|
|
IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
|
|
IEEE80211_NONQOS_TID, sa, da, sa);
|
|
|
|
m->m_flags |= M_ENCAP; /* mark encapsulated */
|
|
IEEE80211_NODE_STAT(ni, tx_mgmt);
|
|
|
|
memset(¶ms, 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;
|
|
return ic->ic_raw_xmit(ni, m, ¶ms);
|
|
}
|
|
|
|
#define ADDSHORT(frm, v) do { \
|
|
frm[0] = (v) & 0xff; \
|
|
frm[1] = (v) >> 8; \
|
|
frm += 2; \
|
|
} while (0)
|
|
#define ADDWORD(frm, v) do { \
|
|
LE_WRITE_4(frm, v); \
|
|
frm += 4; \
|
|
} while (0)
|
|
/*
|
|
* Add a Mesh Path Request IE to a frame.
|
|
*/
|
|
static uint8_t *
|
|
hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
|
|
{
|
|
int i;
|
|
|
|
*frm++ = IEEE80211_ELEMID_MESHPREQ;
|
|
*frm++ = sizeof(struct ieee80211_meshpreq_ie) - 2 +
|
|
(preq->preq_tcount - 1) * sizeof(*preq->preq_targets);
|
|
*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);
|
|
ADDWORD(frm, preq->preq_lifetime);
|
|
ADDWORD(frm, preq->preq_metric);
|
|
*frm++ = preq->preq_tcount;
|
|
for (i = 0; i < preq->preq_tcount; i++) {
|
|
*frm++ = preq->preq_targets[i].target_flags;
|
|
IEEE80211_ADDR_COPY(frm, preq->preq_targets[i].target_addr);
|
|
frm += 6;
|
|
ADDWORD(frm, preq->preq_targets[i].target_seq);
|
|
}
|
|
return frm;
|
|
}
|
|
|
|
/*
|
|
* 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++ = sizeof(struct ieee80211_meshprep_ie) - 2;
|
|
*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);
|
|
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.
|
|
*/
|
|
static uint8_t *
|
|
hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
|
|
{
|
|
int i;
|
|
|
|
*frm++ = IEEE80211_ELEMID_MESHPERR;
|
|
*frm++ = sizeof(struct ieee80211_meshperr_ie) - 2 +
|
|
(perr->perr_ndests - 1) * sizeof(*perr->perr_dests);
|
|
*frm++ = perr->perr_ttl;
|
|
*frm++ = perr->perr_ndests;
|
|
for (i = 0; i < perr->perr_ndests; i++) {
|
|
*frm++ = perr->perr_dests[i].dest_flags;
|
|
IEEE80211_ADDR_COPY(frm, perr->perr_dests[i].dest_addr);
|
|
frm += 6;
|
|
ADDWORD(frm, perr->perr_dests[i].dest_seq);
|
|
ADDSHORT(frm, perr->perr_dests[i].dest_rcode);
|
|
}
|
|
return frm;
|
|
}
|
|
|
|
/*
|
|
* 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++ = sizeof(struct ieee80211_meshrann_ie) - 2;
|
|
*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_metric);
|
|
return frm;
|
|
}
|
|
|
|
static void
|
|
hwmp_rootmode_setup(struct ieee80211vap *vap)
|
|
{
|
|
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
|
|
|
|
switch (hs->hs_rootmode) {
|
|
case IEEE80211_HWMP_ROOTMODE_DISABLED:
|
|
callout_drain(&hs->hs_roottimer);
|
|
break;
|
|
case IEEE80211_HWMP_ROOTMODE_NORMAL:
|
|
case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
|
|
callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
|
|
hwmp_rootmode_cb, vap);
|
|
break;
|
|
case IEEE80211_HWMP_ROOTMODE_RANN:
|
|
callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
|
|
hwmp_rootmode_rann_cb, vap);
|
|
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 = IEEE80211_MESHPREQ_FLAGS_AM;
|
|
if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
|
|
preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PR;
|
|
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_RF;
|
|
PREQ_TSEQ(0) = 0;
|
|
vap->iv_stats.is_hwmp_rootreqs++;
|
|
hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq);
|
|
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_PORTAL)
|
|
rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR;
|
|
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_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
|
|
|
|
vap->iv_stats.is_hwmp_rootrann++;
|
|
hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann);
|
|
hwmp_rootmode_setup(vap);
|
|
}
|
|
|
|
#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 *rt = NULL;
|
|
struct ieee80211_mesh_route *rtorig = NULL;
|
|
struct ieee80211_hwmp_route *hrorig;
|
|
struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
|
|
struct ieee80211_meshprep_ie prep;
|
|
|
|
if (ni == vap->iv_bss ||
|
|
ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
|
|
return;
|
|
/*
|
|
* 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, source %s", ether_sprintf(preq->preq_origaddr));
|
|
|
|
/*
|
|
* Acceptance criteria: if the PREQ is not for us and
|
|
* forwarding is disabled, discard this PREQ.
|
|
*/
|
|
if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) &&
|
|
!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
|
|
IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
|
|
preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
|
|
return;
|
|
}
|
|
rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
|
|
if (rtorig == NULL)
|
|
rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
|
|
hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
|
|
/*
|
|
* Sequence number validation.
|
|
*/
|
|
if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) &&
|
|
HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"discard PREQ from %s, old seq no %u <= %u",
|
|
ether_sprintf(preq->preq_origaddr),
|
|
preq->preq_origseq, hrorig->hr_seq);
|
|
return;
|
|
}
|
|
hrorig->hr_preqid = preq->preq_id;
|
|
hrorig->hr_seq = preq->preq_origseq;
|
|
|
|
/*
|
|
* Check if the PREQ is addressed to us.
|
|
*/
|
|
if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"reply to %s", ether_sprintf(preq->preq_origaddr));
|
|
/*
|
|
* Build and send a PREP frame.
|
|
*/
|
|
prep.prep_flags = 0;
|
|
prep.prep_hopcount = 0;
|
|
prep.prep_ttl = ms->ms_ttl;
|
|
IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
|
|
prep.prep_targetseq = ++hs->hs_seq;
|
|
prep.prep_lifetime = preq->preq_lifetime;
|
|
prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
|
|
IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
|
|
prep.prep_origseq = preq->preq_origseq;
|
|
hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep);
|
|
/*
|
|
* Build the reverse path, if we don't have it already.
|
|
*/
|
|
rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
|
|
if (rt == NULL)
|
|
hwmp_discover(vap, preq->preq_origaddr, NULL);
|
|
else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0)
|
|
hwmp_discover(vap, rt->rt_dest, NULL);
|
|
return;
|
|
}
|
|
/*
|
|
* 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_MESHPREQ_TFLAGS_RF) ==
|
|
(IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) {
|
|
uint8_t rootmac[IEEE80211_ADDR_LEN];
|
|
|
|
IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr);
|
|
rt = ieee80211_mesh_rt_find(vap, rootmac);
|
|
if (rt == NULL) {
|
|
rt = ieee80211_mesh_rt_add(vap, rootmac);
|
|
if (rt == NULL) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"unable to add root mesh path to %s",
|
|
ether_sprintf(rootmac));
|
|
vap->iv_stats.is_mesh_rtaddfailed++;
|
|
return;
|
|
}
|
|
}
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"root mesh station @ %s", ether_sprintf(rootmac));
|
|
|
|
/*
|
|
* Reply with a PREP if we don't have a path to the root
|
|
* or if the root sent us a proactive PREQ.
|
|
*/
|
|
if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
|
|
(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
|
|
prep.prep_flags = 0;
|
|
prep.prep_hopcount = 0;
|
|
prep.prep_ttl = ms->ms_ttl;
|
|
IEEE80211_ADDR_COPY(prep.prep_origaddr, rootmac);
|
|
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->iv_bss, vap->iv_myaddr,
|
|
broadcastaddr, &prep);
|
|
}
|
|
hwmp_discover(vap, rootmac, NULL);
|
|
return;
|
|
}
|
|
rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
|
|
|
|
/*
|
|
* Forwarding and Intermediate reply for PREQs with 1 target.
|
|
*/
|
|
if (preq->preq_tcount == 1) {
|
|
struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
|
|
|
|
memcpy(&ppreq, preq, sizeof(ppreq));
|
|
/*
|
|
* We have a valid route to this node.
|
|
*/
|
|
if (rt != NULL &&
|
|
(rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
|
|
if (preq->preq_ttl > 1 &&
|
|
preq->preq_hopcount < hs->hs_maxhops) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"forward PREQ from %s",
|
|
ether_sprintf(preq->preq_origaddr));
|
|
/*
|
|
* Propagate the original PREQ.
|
|
*/
|
|
ppreq.preq_hopcount += 1;
|
|
ppreq.preq_ttl -= 1;
|
|
ppreq.preq_metric +=
|
|
ms->ms_pmetric->mpm_metric(ni);
|
|
/*
|
|
* Set TO and unset RF bits because we are going
|
|
* to send a PREP next.
|
|
*/
|
|
ppreq.preq_targets[0].target_flags |=
|
|
IEEE80211_MESHPREQ_TFLAGS_TO;
|
|
ppreq.preq_targets[0].target_flags &=
|
|
~IEEE80211_MESHPREQ_TFLAGS_RF;
|
|
hwmp_send_preq(ni, vap->iv_myaddr,
|
|
broadcastaddr, &ppreq);
|
|
}
|
|
/*
|
|
* Check if we can send an intermediate Path Reply,
|
|
* i.e., Target Only bit is not set.
|
|
*/
|
|
if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
|
|
struct ieee80211_meshprep_ie prep;
|
|
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"intermediate reply for PREQ from %s",
|
|
ether_sprintf(preq->preq_origaddr));
|
|
prep.prep_flags = 0;
|
|
prep.prep_hopcount = rt->rt_nhops + 1;
|
|
prep.prep_ttl = ms->ms_ttl;
|
|
IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
|
|
PREQ_TADDR(0));
|
|
prep.prep_targetseq = hrorig->hr_seq;
|
|
prep.prep_lifetime = preq->preq_lifetime;
|
|
prep.prep_metric = rt->rt_metric +
|
|
ms->ms_pmetric->mpm_metric(ni);
|
|
IEEE80211_ADDR_COPY(&prep.prep_origaddr,
|
|
preq->preq_origaddr);
|
|
prep.prep_origseq = hrorig->hr_seq;
|
|
hwmp_send_prep(ni, vap->iv_myaddr,
|
|
broadcastaddr, &prep);
|
|
}
|
|
/*
|
|
* We have no information about this path,
|
|
* propagate the PREQ.
|
|
*/
|
|
} else if (preq->preq_ttl > 1 &&
|
|
preq->preq_hopcount < hs->hs_maxhops) {
|
|
if (rt == NULL) {
|
|
rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0));
|
|
if (rt == NULL) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
|
|
ni, "unable to add PREQ path to %s",
|
|
ether_sprintf(PREQ_TADDR(0)));
|
|
vap->iv_stats.is_mesh_rtaddfailed++;
|
|
return;
|
|
}
|
|
}
|
|
rt->rt_metric = preq->preq_metric;
|
|
rt->rt_lifetime = preq->preq_lifetime;
|
|
hrorig = IEEE80211_MESH_ROUTE_PRIV(rt,
|
|
struct ieee80211_hwmp_route);
|
|
hrorig->hr_seq = preq->preq_origseq;
|
|
hrorig->hr_preqid = preq->preq_id;
|
|
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"forward PREQ from %s",
|
|
ether_sprintf(preq->preq_origaddr));
|
|
ppreq.preq_hopcount += 1;
|
|
ppreq.preq_ttl -= 1;
|
|
ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
|
|
hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr,
|
|
&ppreq);
|
|
}
|
|
}
|
|
|
|
}
|
|
#undef PREQ_TFLAGS
|
|
#undef PREQ_TADDR
|
|
#undef PREQ_TSEQ
|
|
|
|
static int
|
|
hwmp_send_preq(struct ieee80211_node *ni,
|
|
const uint8_t sa[IEEE80211_ADDR_LEN],
|
|
const uint8_t da[IEEE80211_ADDR_LEN],
|
|
struct ieee80211_meshpreq_ie *preq)
|
|
{
|
|
struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
|
|
|
|
/*
|
|
* Enforce PREQ interval.
|
|
*/
|
|
if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0)
|
|
return EALREADY;
|
|
getmicrouptime(&hs->hs_lastpreq);
|
|
|
|
/*
|
|
* 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;
|
|
return hwmp_send_action(ni, sa, da, (uint8_t *)preq,
|
|
sizeof(struct ieee80211_meshpreq_ie));
|
|
}
|
|
|
|
static void
|
|
hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
|
|
const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
|
|
{
|
|
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 ieee80211com *ic = vap->iv_ic;
|
|
struct ifnet *ifp = vap->iv_ifp;
|
|
struct mbuf *m, *next;
|
|
|
|
/*
|
|
* Acceptance criteria: if the corresponding PREQ was not generated
|
|
* by us and forwarding is disabled, discard this PREP.
|
|
*/
|
|
if (ni == vap->iv_bss ||
|
|
ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
|
|
return;
|
|
if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
|
|
!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
|
|
return;
|
|
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"received PREP from %s", ether_sprintf(prep->prep_targetaddr));
|
|
|
|
rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
|
|
if (rt == NULL) {
|
|
/*
|
|
* If we have no entry this could be a reply to a root PREQ.
|
|
*/
|
|
if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) {
|
|
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 %s",
|
|
ether_sprintf(prep->prep_targetaddr));
|
|
vap->iv_stats.is_mesh_rtaddfailed++;
|
|
return;
|
|
}
|
|
IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
|
|
rt->rt_nhops = prep->prep_hopcount;
|
|
rt->rt_lifetime = prep->prep_lifetime;
|
|
rt->rt_metric = prep->prep_metric;
|
|
rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"add root path to %s nhops %d metric %d (PREP)",
|
|
ether_sprintf(prep->prep_targetaddr),
|
|
rt->rt_nhops, rt->rt_metric);
|
|
return;
|
|
}
|
|
return;
|
|
}
|
|
/*
|
|
* Sequence number validation.
|
|
*/
|
|
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
|
|
if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq)) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"discard PREP from %s, old seq no %u <= %u",
|
|
ether_sprintf(prep->prep_targetaddr),
|
|
prep->prep_targetseq, hr->hr_seq);
|
|
return;
|
|
}
|
|
hr->hr_seq = prep->prep_targetseq;
|
|
/*
|
|
* 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 */
|
|
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"propagate PREP from %s",
|
|
ether_sprintf(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);
|
|
IEEE80211_ADDR_COPY(pprep.prep_targetaddr, vap->iv_myaddr);
|
|
hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep);
|
|
}
|
|
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
|
|
if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
|
|
/* NB: never clobber a proxy entry */;
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"discard PREP for %s, route is marked PROXY",
|
|
ether_sprintf(prep->prep_targetaddr));
|
|
vap->iv_stats.is_hwmp_proxy++;
|
|
} else if (prep->prep_origseq == hr->hr_origseq) {
|
|
/*
|
|
* Check if we already have a path to this node.
|
|
* If we do, check if this path reply contains a
|
|
* better route.
|
|
*/
|
|
if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
|
|
(prep->prep_hopcount < rt->rt_nhops ||
|
|
prep->prep_metric < rt->rt_metric)) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"%s path to %s, hopcount %d:%d metric %d:%d",
|
|
rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
|
|
"prefer" : "update",
|
|
ether_sprintf(prep->prep_origaddr),
|
|
rt->rt_nhops, prep->prep_hopcount,
|
|
rt->rt_metric, prep->prep_metric);
|
|
IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
|
|
rt->rt_nhops = prep->prep_hopcount;
|
|
rt->rt_lifetime = prep->prep_lifetime;
|
|
rt->rt_metric = prep->prep_metric;
|
|
rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
|
|
} else {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"ignore PREP for %s, hopcount %d:%d metric %d:%d",
|
|
ether_sprintf(prep->prep_targetaddr),
|
|
rt->rt_nhops, prep->prep_hopcount,
|
|
rt->rt_metric, prep->prep_metric);
|
|
}
|
|
} else {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"discard PREP for %s, wrong seqno %u != %u",
|
|
ether_sprintf(prep->prep_targetaddr), prep->prep_origseq,
|
|
hr->hr_seq);
|
|
vap->iv_stats.is_hwmp_wrongseq++;
|
|
}
|
|
/*
|
|
* 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.
|
|
*/
|
|
m = ieee80211_ageq_remove(&ic->ic_stageq,
|
|
(struct ieee80211_node *)(uintptr_t)
|
|
ieee80211_mac_hash(ic, rt->rt_dest));
|
|
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);
|
|
ifp->if_transmit(ifp, m);
|
|
}
|
|
}
|
|
|
|
static int
|
|
hwmp_send_prep(struct ieee80211_node *ni,
|
|
const uint8_t sa[IEEE80211_ADDR_LEN],
|
|
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;
|
|
return hwmp_send_action(ni, sa, da, (uint8_t *)prep,
|
|
sizeof(struct ieee80211_meshprep_ie));
|
|
}
|
|
|
|
#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->iv_bss, vap->iv_myaddr, 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_DRCODE(n) perr->perr_dests[n].dest_rcode
|
|
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_hwmp_route *hr;
|
|
struct ieee80211_meshperr_ie pperr;
|
|
int i, forward = 0;
|
|
|
|
/*
|
|
* Acceptance criteria: check if we received a PERR from a
|
|
* neighbor and forwarding is enabled.
|
|
*/
|
|
if (ni == vap->iv_bss ||
|
|
ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
|
|
!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
|
|
return;
|
|
/*
|
|
* Find all routing entries that match and delete them.
|
|
*/
|
|
for (i = 0; i < perr->perr_ndests; i++) {
|
|
rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
|
|
if (rt == NULL)
|
|
continue;
|
|
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
|
|
if (!(PERR_DFLAGS(0) & IEEE80211_MESHPERR_DFLAGS_USN) &&
|
|
HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) {
|
|
ieee80211_mesh_rt_del(vap, rt->rt_dest);
|
|
ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest);
|
|
rt = NULL;
|
|
forward = 1;
|
|
}
|
|
}
|
|
/*
|
|
* Propagate the PERR if we previously found it on our routing table.
|
|
* XXX handle ndest > 1
|
|
*/
|
|
if (forward && perr->perr_ttl > 1) {
|
|
IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
|
|
"propagate PERR from %s", ether_sprintf(wh->i_addr2));
|
|
memcpy(&pperr, perr, sizeof(*perr));
|
|
pperr.perr_ttl--;
|
|
hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr,
|
|
&pperr);
|
|
}
|
|
}
|
|
#undef PEER_DADDR
|
|
#undef PERR_DSEQ
|
|
|
|
static int
|
|
hwmp_send_perr(struct ieee80211_node *ni,
|
|
const uint8_t sa[IEEE80211_ADDR_LEN],
|
|
const uint8_t da[IEEE80211_ADDR_LEN],
|
|
struct ieee80211_meshperr_ie *perr)
|
|
{
|
|
struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
|
|
|
|
/*
|
|
* 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;
|
|
return hwmp_send_action(ni, sa, da, (uint8_t *)perr,
|
|
sizeof(struct ieee80211_meshperr_ie));
|
|
}
|
|
|
|
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_meshrann_ie prann;
|
|
|
|
if (ni == vap->iv_bss ||
|
|
ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
|
|
IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
|
|
return;
|
|
|
|
rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
|
|
/*
|
|
* Discover the path to the root mesh STA.
|
|
* If we already know it, propagate the RANN element.
|
|
*/
|
|
if (rt == NULL) {
|
|
hwmp_discover(vap, rann->rann_addr, NULL);
|
|
return;
|
|
}
|
|
hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
|
|
if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq)) {
|
|
hr->hr_seq = rann->rann_seq;
|
|
if (rann->rann_ttl > 1 &&
|
|
rann->rann_hopcount < hs->hs_maxhops &&
|
|
(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
|
|
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->iv_bss, vap->iv_myaddr,
|
|
broadcastaddr, &prann);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
hwmp_send_rann(struct ieee80211_node *ni,
|
|
const uint8_t sa[IEEE80211_ADDR_LEN],
|
|
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;
|
|
return hwmp_send_action(ni, sa, da, (uint8_t *)rann,
|
|
sizeof(struct ieee80211_meshrann_ie));
|
|
}
|
|
|
|
#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 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 %s",
|
|
ether_sprintf(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_VALID) == 0) {
|
|
if (hr->hr_origseq == 0)
|
|
hr->hr_origseq = ++hs->hs_seq;
|
|
rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
|
|
rt->rt_lifetime =
|
|
ticks_to_msecs(ieee80211_hwmp_pathtimeout);
|
|
/* XXX check preq retries */
|
|
sendpreq = 1;
|
|
IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
|
|
"start path discovery (src %s)",
|
|
m == NULL ? "<none>" : ether_sprintf(
|
|
mtod(m, struct ether_header *)->ether_shost));
|
|
/*
|
|
* Try to discover the path for this node.
|
|
*/
|
|
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 = rt->rt_lifetime;
|
|
preq.preq_metric = rt->rt_metric;
|
|
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;
|
|
if (ieee80211_hwmp_replyforward)
|
|
PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF;
|
|
PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
|
|
PREQ_TSEQ(0) = 0;
|
|
/* XXX check return value */
|
|
hwmp_send_preq(vap->iv_bss, vap->iv_myaddr,
|
|
broadcastaddr, &preq);
|
|
}
|
|
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");
|
|
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);
|