#include /*- * 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 #ifdef __FreeBSD__ __FBSDID("$FreeBSD$"); #endif /* * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP. * * Based on March 2009, D3.0 802.11s draft spec. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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 ieee80211_node *, const uint8_t [IEEE80211_ADDR_LEN], 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 ieee80211_node *, const uint8_t [IEEE80211_ADDR_LEN], const uint8_t [IEEE80211_ADDR_LEN], struct ieee80211_meshpreq_ie *); 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 ieee80211_node *, const uint8_t [IEEE80211_ADDR_LEN], 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 ieee80211_node *, const uint8_t [IEEE80211_ADDR_LEN], const uint8_t [IEEE80211_ADDR_LEN], struct ieee80211_meshperr_ie *); 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 ieee80211_node *, const uint8_t [IEEE80211_ADDR_LEN], 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 }; /* unalligned little endian access */ #define LE_WRITE_2(p, v) do { \ ((uint8_t *)(p))[0] = (v) & 0xff; \ ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ } while (0) #define LE_WRITE_4(p, v) do { \ ((uint8_t *)(p))[0] = (v) & 0xff; \ ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \ ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \ ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \ } while (0) /* 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_GT(a, b) ((int32_t)((a)-(b)) > 0) #define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0) /* * 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*/ int hr_preqretries; }; 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 */ struct timeval hs_lastpreq; /* last time we sent a PREQ */ struct timeval hs_lastperr; /* last time we sent a PERR */ int hs_rootmode; /* proactive HWMP */ struct callout hs_roottimer; uint8_t hs_maxhops; /* max hop count */ }; SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0, "IEEE 802.11s HWMP parameters"); static int ieee80211_hwmp_targetonly = 0; SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs"); static int ieee80211_hwmp_replyforward = 1; SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, replyforward, CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_replyforward, 0, "Set RF bit on generated PREQs"); static int ieee80211_hwmp_pathtimeout = -1; SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I", "path entry lifetime (ms)"); static int ieee80211_hwmp_roottimeout = -1; SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW, &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, &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, &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I", "root announcement interval (ms)"); #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_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, &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I", "mesh route inactivity timeout (ms)"); static void ieee80211_hwmp_init(void) { 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); /* * Register action frame handler. */ ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH, IEEE80211_ACTION_MESHPATH_SEL, 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); 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 = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP, M_NOWAIT | 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, CALLOUT_MPSAFE); vap->iv_hwmp = hs; } void hwmp_vdetach(struct ieee80211vap *vap) { struct ieee80211_hwmp_state *hs = vap->iv_hwmp; callout_drain(&hs->hs_roottimer); free(vap->iv_hwmp, M_80211_VAP); vap->iv_hwmp = NULL; } 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; } 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 */ int found = 0; while (efrm - iefrm > 1) { IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0); switch (*iefrm) { case IEEE80211_ELEMID_MESHPREQ: { const struct ieee80211_meshpreq_ie *mpreq = (const struct ieee80211_meshpreq_ie *) iefrm; /* XXX > 1 target */ if (mpreq->preq_len != sizeof(struct ieee80211_meshpreq_ie) - 2) { IEEE80211_DISCARD(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, wh, NULL, "%s", "PREQ with wrong len"); vap->iv_stats.is_rx_mgtdiscard++; break; } memcpy(&preq, mpreq, sizeof(preq)); preq.preq_id = LE_READ_4(&mpreq->preq_id); preq.preq_origseq = LE_READ_4(&mpreq->preq_origseq); preq.preq_lifetime = LE_READ_4(&mpreq->preq_lifetime); preq.preq_metric = LE_READ_4(&mpreq->preq_metric); preq.preq_targets[0].target_seq = LE_READ_4(&mpreq->preq_targets[0].target_seq); hwmp_recv_preq(vap, ni, wh, &preq); found++; break; } case IEEE80211_ELEMID_MESHPREP: { const struct ieee80211_meshprep_ie *mprep = (const struct ieee80211_meshprep_ie *) iefrm; if (mprep->prep_len != sizeof(struct ieee80211_meshprep_ie) - 2) { IEEE80211_DISCARD(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, wh, NULL, "%s", "PREP with wrong len"); vap->iv_stats.is_rx_mgtdiscard++; break; } memcpy(&prep, mprep, sizeof(prep)); prep.prep_targetseq = LE_READ_4(&mprep->prep_targetseq); prep.prep_lifetime = LE_READ_4(&mprep->prep_lifetime); prep.prep_metric = LE_READ_4(&mprep->prep_metric); prep.prep_origseq = LE_READ_4(&mprep->prep_origseq); hwmp_recv_prep(vap, ni, wh, &prep); found++; break; } case IEEE80211_ELEMID_MESHPERR: { const struct ieee80211_meshperr_ie *mperr = (const struct ieee80211_meshperr_ie *) iefrm; /* XXX > 1 target */ if (mperr->perr_len != sizeof(struct ieee80211_meshperr_ie) - 2) { IEEE80211_DISCARD(vap, IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP, wh, NULL, "%s", "PERR with wrong len"); vap->iv_stats.is_rx_mgtdiscard++; break; } memcpy(&perr, mperr, sizeof(perr)); perr.perr_dests[0].dest_seq = LE_READ_4(&mperr->perr_dests[0].dest_seq); hwmp_recv_perr(vap, ni, wh, &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 = LE_READ_4(&mrann->rann_seq); rann.rann_metric = LE_READ_4(&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 ieee80211_node *ni, const uint8_t sa[IEEE80211_ADDR_LEN], const uint8_t da[IEEE80211_ADDR_LEN], uint8_t *ie, size_t len) { struct ieee80211vap *vap = ni->ni_vap; struct ieee80211com *ic = ni->ni_ic; struct ieee80211_bpf_params params; struct mbuf *m; uint8_t *frm; 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")); /* * Hold a reference on the node so it doesn't go away until after * the xmit is complete all the way in the driver. On error we * will remove our reference. */ #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); if (rtorig == NULL) { /* XXX stat */ return; } 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 ? "" : 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);