/* $NetBSD: ieee80211_input.c,v 1.38 2005/02/26 22:45:09 perry Exp $ */ /*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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: src/sys/net80211/ieee80211_input.c,v 1.20 2004/04/02 23:35:24 sam Exp $"); #else __KERNEL_RCSID(0, "$NetBSD: ieee80211_input.c,v 1.38 2005/02/26 22:45:09 perry Exp $"); #endif #include "opt_inet.h" #ifdef __NetBSD__ #include "bpfilter.h" #endif /* __NetBSD__ */ #include #include #include #include #include #include #include #include #include #ifdef __FreeBSD__ #include #endif #include #include #ifdef __FreeBSD__ #include #endif #include #include #include #include #ifdef __FreeBSD__ #include #else #include #endif #include #include #include #if NBPFILTER > 0 #include #endif #ifdef INET #include #ifdef __FreeBSD__ #include #else #include #endif #endif const struct timeval ieee80211_merge_print_intvl = {.tv_sec = 1, .tv_usec = 0}; static void ieee80211_recv_pspoll(struct ieee80211com *, struct mbuf *, int, u_int32_t); #ifdef IEEE80211_DEBUG /* * Decide if a received management frame should be * printed when debugging is enabled. This filters some * of the less interesting frames that come frequently * (e.g. beacons). */ static __inline int doprint(struct ieee80211com *ic, int subtype) { switch (subtype) { case IEEE80211_FC0_SUBTYPE_BEACON: return (ic->ic_state == IEEE80211_S_SCAN); case IEEE80211_FC0_SUBTYPE_PROBE_REQ: return (ic->ic_opmode == IEEE80211_M_IBSS); } return 1; } #endif /* * Process a received frame. The node associated with the sender * should be supplied. If nothing was found in the node table then * the caller is assumed to supply a reference to ic_bss instead. * The RSSI and a timestamp are also supplied. The RSSI data is used * during AP scanning to select a AP to associate with; it can have * any units so long as values have consistent units and higher values * mean ``better signal''. The receive timestamp is currently not used * by the 802.11 layer. */ void ieee80211_input(struct ifnet *ifp, struct mbuf *m, struct ieee80211_node *ni, int rssi, u_int32_t rstamp) { struct ieee80211com *ic = (void *)ifp; struct ieee80211_frame *wh; struct ether_header *eh; struct mbuf *m1; int len; u_int8_t dir, type, subtype; u_int16_t rxseq; ALTQ_DECL(struct altq_pktattr pktattr;) IASSERT(ni != NULL, ("null node")); /* trim CRC here so WEP can find its own CRC at the end of packet. */ if (m->m_flags & M_HASFCS) { m_adj(m, -IEEE80211_CRC_LEN); m->m_flags &= ~M_HASFCS; } /* * In monitor mode, send everything directly to bpf. * Also do not process frames w/o i_addr2 any further. * XXX may want to include the CRC */ if (ic->ic_opmode == IEEE80211_M_MONITOR || m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) goto out; wh = mtod(m, struct ieee80211_frame *); if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != IEEE80211_FC0_VERSION_0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("receive packet with wrong version: %x\n", wh->i_fc[0])); ic->ic_stats.is_rx_badversion++; goto err; } dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK; /* * NB: We are not yet prepared to handle control frames, * but permitting drivers to send them to us allows * them to go through bpf tapping at the 802.11 layer. */ if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: frame too short, len %u\n", __func__, m->m_pkthdr.len)); ic->ic_stats.is_rx_tooshort++; goto out; } if (ic->ic_state != IEEE80211_S_SCAN) { ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; rxseq = ni->ni_rxseq; ni->ni_rxseq = le16toh(*(u_int16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; /* TODO: fragment */ if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && rxseq == ni->ni_rxseq) { /* duplicate, silently discarded */ ic->ic_stats.is_rx_dup++; /* XXX per-station stat */ goto out; } ni->ni_inact = 0; if (ic->ic_opmode == IEEE80211_M_MONITOR) goto out; } if (ic->ic_set_tim != NULL && (wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) && ni->ni_pwrsave == 0) { /* turn on power save mode */ if (ifp->if_flags & IFF_DEBUG) printf("%s: power save mode on for %s\n", ifp->if_xname, ether_sprintf(wh->i_addr2)); ni->ni_pwrsave = IEEE80211_PS_SLEEP; } if (ic->ic_set_tim != NULL && (wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) == 0 && ni->ni_pwrsave != 0) { /* turn off power save mode, dequeue stored packets */ ni->ni_pwrsave = 0; if (ic->ic_set_tim) ic->ic_set_tim(ic, ni->ni_associd, 0); if (ifp->if_flags & IFF_DEBUG) printf("%s: power save mode off for %s\n", ifp->if_xname, ether_sprintf(wh->i_addr2)); while (!IF_IS_EMPTY(&ni->ni_savedq)) { struct mbuf *m; IF_DEQUEUE(&ni->ni_savedq, m); IF_ENQUEUE(&ic->ic_pwrsaveq, m); (*ifp->if_start)(ifp); } } switch (type) { case IEEE80211_FC0_TYPE_DATA: switch (ic->ic_opmode) { case IEEE80211_M_STA: if (dir != IEEE80211_FC1_DIR_FROMDS) { ic->ic_stats.is_rx_wrongdir++; goto out; } if (ic->ic_state != IEEE80211_S_SCAN && !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid)) { /* Source address is not our BSS. */ IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, ("%s: discard frame from SA %s\n", __func__, ether_sprintf(wh->i_addr2))); ic->ic_stats.is_rx_wrongbss++; goto out; } if ((ifp->if_flags & IFF_SIMPLEX) && IEEE80211_IS_MULTICAST(wh->i_addr1) && IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_myaddr)) { /* * In IEEE802.11 network, multicast packet * sent from me is broadcasted from AP. * It should be silently discarded for * SIMPLEX interface. */ ic->ic_stats.is_rx_mcastecho++; goto out; } break; case IEEE80211_M_IBSS: case IEEE80211_M_AHDEMO: if (dir != IEEE80211_FC1_DIR_NODS) { ic->ic_stats.is_rx_wrongdir++; goto out; } if (ic->ic_state != IEEE80211_S_SCAN && !IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid) && !IEEE80211_ADDR_EQ(wh->i_addr3, ifp->if_broadcastaddr)) { /* Destination is not our BSS or broadcast. */ IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, ("%s: discard data frame to DA %s\n", __func__, ether_sprintf(wh->i_addr3))); ic->ic_stats.is_rx_wrongbss++; goto out; } break; case IEEE80211_M_HOSTAP: if (dir != IEEE80211_FC1_DIR_TODS) { ic->ic_stats.is_rx_wrongdir++; goto out; } if (ic->ic_state != IEEE80211_S_SCAN && !IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_bss->ni_bssid) && !IEEE80211_ADDR_EQ(wh->i_addr1, ifp->if_broadcastaddr)) { /* BSS is not us or broadcast. */ IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, ("%s: discard data frame to BSS %s\n", __func__, ether_sprintf(wh->i_addr1))); ic->ic_stats.is_rx_wrongbss++; goto out; } /* check if source STA is associated */ if (ni == ic->ic_bss) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, ("%s: data from unknown src %s\n", __func__, ether_sprintf(wh->i_addr2))); /* NB: caller deals with reference */ ni = ieee80211_dup_bss(ic, wh->i_addr2); if (ni != NULL) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_NOT_AUTHED); } ic->ic_stats.is_rx_notassoc++; goto err; } if (ni->ni_associd == 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, ("%s: data from unassoc src %s\n", __func__, ether_sprintf(wh->i_addr2))); IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DISASSOC, IEEE80211_REASON_NOT_ASSOCED); ic->ic_stats.is_rx_notassoc++; goto err; } break; case IEEE80211_M_MONITOR: break; } if (wh->i_fc[1] & IEEE80211_FC1_WEP) { if (ic->ic_flags & IEEE80211_F_PRIVACY) { m = ieee80211_wep_crypt(ifp, m, 0); if (m == NULL) { ic->ic_stats.is_rx_wepfail++; goto err; } wh = mtod(m, struct ieee80211_frame *); } else { ic->ic_stats.is_rx_nowep++; goto out; } } #if NBPFILTER > 0 /* copy to listener after decrypt */ if (ic->ic_rawbpf) bpf_mtap(ic->ic_rawbpf, m); #endif m = ieee80211_decap(ifp, m); if (m == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_INPUT, ("%s: decapsulation error for src %s\n", __func__, ether_sprintf(wh->i_addr2))); ic->ic_stats.is_rx_decap++; goto err; } ifp->if_ipackets++; /* perform as a bridge within the AP */ m1 = NULL; if (ic->ic_opmode == IEEE80211_M_HOSTAP) { eh = mtod(m, struct ether_header *); if (ETHER_IS_MULTICAST(eh->ether_dhost)) { m1 = m_copypacket(m, M_DONTWAIT); if (m1 == NULL) ifp->if_oerrors++; else m1->m_flags |= M_MCAST; } else { ni = ieee80211_find_node(ic, eh->ether_dhost); if (ni != NULL) { if (ni->ni_associd != 0) { m1 = m; m = NULL; } } } if (m1 != NULL) { #ifdef ALTQ if (ALTQ_IS_ENABLED(&ifp->if_snd)) altq_etherclassify(&ifp->if_snd, m1, &pktattr); #endif len = m1->m_pkthdr.len; IF_ENQUEUE(&ifp->if_snd, m1); if (m != NULL) ifp->if_omcasts++; ifp->if_obytes += len; } } if (m != NULL) { #if NBPFILTER > 0 /* * If we forward packet into transmitter of the AP, * we don't need to duplicate for DLT_EN10MB. */ if (ifp->if_bpf && m1 == NULL) bpf_mtap(ifp->if_bpf, m); #endif (*ifp->if_input)(ifp, m); } return; case IEEE80211_FC0_TYPE_MGT: if (dir != IEEE80211_FC1_DIR_NODS) { ic->ic_stats.is_rx_wrongdir++; goto err; } if (ic->ic_opmode == IEEE80211_M_AHDEMO) { ic->ic_stats.is_rx_ahdemo_mgt++; goto out; } subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; /* drop frames without interest */ if (ic->ic_state == IEEE80211_S_SCAN) { if (subtype != IEEE80211_FC0_SUBTYPE_BEACON && subtype != IEEE80211_FC0_SUBTYPE_PROBE_RESP) { ic->ic_stats.is_rx_mgtdiscard++; goto out; } } #ifdef IEEE80211_DEBUG if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) || ieee80211_msg_dumppkts(ic)) { if_printf(ifp, "received %s from %s rssi %d\n", ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], ether_sprintf(wh->i_addr2), rssi); } #endif #if NBPFILTER > 0 if (ic->ic_rawbpf) bpf_mtap(ic->ic_rawbpf, m); #endif (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, rstamp); m_freem(m); return; case IEEE80211_FC0_TYPE_CTL: ic->ic_stats.is_rx_ctl++; if (ic->ic_opmode != IEEE80211_M_HOSTAP) goto out; subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; if (subtype == IEEE80211_FC0_SUBTYPE_PS_POLL) { /* XXX statistic */ /* Dump out a single packet from the host */ if (ifp->if_flags & IFF_DEBUG) printf("%s: got power save probe from %s\n", ifp->if_xname, ether_sprintf(wh->i_addr2)); ieee80211_recv_pspoll(ic, m, rssi, rstamp); } goto out; default: IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: bad frame type %x\n", __func__, type)); /* should not come here */ break; } err: ifp->if_ierrors++; out: if (m != NULL) { #if NBPFILTER > 0 if (ic->ic_rawbpf) bpf_mtap(ic->ic_rawbpf, m); #endif m_freem(m); } } struct mbuf * ieee80211_decap(struct ifnet *ifp, struct mbuf *m) { struct ether_header *eh; struct ieee80211_frame wh; struct llc *llc; if (m->m_len < sizeof(wh) + sizeof(*llc)) { m = m_pullup(m, sizeof(wh) + sizeof(*llc)); if (m == NULL) return NULL; } memcpy(&wh, mtod(m, caddr_t), sizeof(wh)); llc = (struct llc *)(mtod(m, caddr_t) + sizeof(wh)); if (llc->llc_dsap == LLC_SNAP_LSAP && llc->llc_ssap == LLC_SNAP_LSAP && llc->llc_control == LLC_UI && llc->llc_snap.org_code[0] == 0 && llc->llc_snap.org_code[1] == 0 && llc->llc_snap.org_code[2] == 0) { m_adj(m, sizeof(wh) + sizeof(struct llc) - sizeof(*eh)); llc = NULL; } else { m_adj(m, sizeof(wh) - sizeof(*eh)); } eh = mtod(m, struct ether_header *); switch (wh.i_fc[1] & IEEE80211_FC1_DIR_MASK) { case IEEE80211_FC1_DIR_NODS: IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); break; case IEEE80211_FC1_DIR_TODS: IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr2); break; case IEEE80211_FC1_DIR_FROMDS: IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr1); IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr3); break; case IEEE80211_FC1_DIR_DSTODS: /* not yet supported */ IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: discard DS to DS frame\n", __func__)); m_freem(m); return NULL; } #ifdef ALIGNED_POINTER if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), u_int32_t)) { struct mbuf *n, *n0, **np; caddr_t newdata; int off, pktlen; n0 = NULL; np = &n0; off = 0; pktlen = m->m_pkthdr.len; while (pktlen > off) { if (n0 == NULL) { MGETHDR(n, M_DONTWAIT, MT_DATA); if (n == NULL) { m_freem(m); return NULL; } #ifdef __FreeBSD__ M_MOVE_PKTHDR(n, m); #else M_COPY_PKTHDR(n, m); #endif n->m_len = MHLEN; } else { MGET(n, M_DONTWAIT, MT_DATA); if (n == NULL) { m_freem(m); m_freem(n0); return NULL; } n->m_len = MLEN; } if (pktlen - off >= MINCLSIZE) { MCLGET(n, M_DONTWAIT); if (n->m_flags & M_EXT) n->m_len = n->m_ext.ext_size; } if (n0 == NULL) { newdata = (caddr_t)ALIGN(n->m_data + sizeof(*eh)) - sizeof(*eh); n->m_len -= newdata - n->m_data; n->m_data = newdata; } if (n->m_len > pktlen - off) n->m_len = pktlen - off; m_copydata(m, off, n->m_len, mtod(n, caddr_t)); off += n->m_len; *np = n; np = &n->m_next; } m_freem(m); m = n0; } #endif /* ALIGNED_POINTER */ if (llc != NULL) { eh = mtod(m, struct ether_header *); eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); } return m; } /* * Install received rate set information in the node's state block. */ static int ieee80211_setup_rates(struct ieee80211com *ic, struct ieee80211_node *ni, u_int8_t *rates, u_int8_t *xrates, int flags) { struct ieee80211_rateset *rs = &ni->ni_rates; memset(rs, 0, sizeof(*rs)); rs->rs_nrates = rates[1]; memcpy(rs->rs_rates, rates + 2, rs->rs_nrates); if (xrates != NULL) { u_int8_t nxrates; /* * Tack on 11g extended supported rate element. */ nxrates = xrates[1]; if (rs->rs_nrates + nxrates > IEEE80211_RATE_MAXSIZE) { nxrates = IEEE80211_RATE_MAXSIZE - rs->rs_nrates; IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, ("%s: extended rate set too large;" " only using %u of %u rates\n", __func__, nxrates, xrates[1])); ic->ic_stats.is_rx_rstoobig++; } memcpy(rs->rs_rates + rs->rs_nrates, xrates+2, nxrates); rs->rs_nrates += nxrates; } return ieee80211_fix_rate(ic, ni, flags); } /* Verify the existence and length of __elem or get out. */ #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do { \ if ((__elem) == NULL) { \ IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, \ ("%s: no " #__elem "in %s frame\n", \ __func__, ieee80211_mgt_subtype_name[subtype >> \ IEEE80211_FC0_SUBTYPE_SHIFT])); \ ic->ic_stats.is_rx_elem_missing++; \ return; \ } \ if ((__elem)[1] > (__maxlen)) { \ IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, \ ("%s: bad " #__elem " len %d in %s frame from %s\n",\ __func__, (__elem)[1], \ ieee80211_mgt_subtype_name[subtype >> \ IEEE80211_FC0_SUBTYPE_SHIFT], \ ether_sprintf(wh->i_addr2))); \ ic->ic_stats.is_rx_elem_toobig++; \ return; \ } \ } while (0) #define IEEE80211_VERIFY_LENGTH(_len, _minlen) do { \ if ((_len) < (_minlen)) { \ IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, \ ("%s: %s frame too short from %s\n", \ __func__, \ ieee80211_mgt_subtype_name[subtype >> \ IEEE80211_FC0_SUBTYPE_SHIFT], \ ether_sprintf(wh->i_addr2))); \ ic->ic_stats.is_rx_elem_toosmall++; \ return; \ } \ } while (0) #ifdef IEEE80211_DEBUG static void ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag, u_int8_t mac[IEEE80211_ADDR_LEN], u_int8_t *ssid) { printf("[%s] %s req ssid mismatch: ", ether_sprintf(mac), tag); ieee80211_print_essid(ssid + 2, ssid[1]); printf("\n"); } #define IEEE80211_VERIFY_SSID(_ni, _ssid, _packet_type) do { \ if ((_ssid)[1] != 0 && \ ((_ssid)[1] != (_ni)->ni_esslen || \ memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ if (ieee80211_msg_input(ic)) \ ieee80211_ssid_mismatch(ic, _packet_type, \ wh->i_addr2, _ssid); \ ic->ic_stats.is_rx_ssidmismatch++; \ return; \ } \ } while (0) #else /* !IEEE80211_DEBUG */ #define IEEE80211_VERIFY_SSID(_ni, _ssid, _packet_type) do { \ if ((_ssid)[1] != 0 && \ ((_ssid)[1] != (_ni)->ni_esslen || \ memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \ ic->ic_stats.is_rx_ssidmismatch++; \ return; \ } \ } while (0) #endif /* !IEEE80211_DEBUG */ static void ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, struct ieee80211_node *ni, int rssi, u_int32_t rstamp, u_int16_t seq, u_int16_t status) { switch (ic->ic_opmode) { case IEEE80211_M_IBSS: if (ic->ic_state != IEEE80211_S_RUN || seq != IEEE80211_AUTH_OPEN_REQUEST) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: discard auth from %s; state %u, seq %u\n", __func__, ether_sprintf(wh->i_addr2), ic->ic_state, seq)); ic->ic_stats.is_rx_bad_auth++; return; } ieee80211_new_state(ic, IEEE80211_S_AUTH, wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); break; case IEEE80211_M_AHDEMO: /* should not come here */ break; case IEEE80211_M_HOSTAP: if (ic->ic_state != IEEE80211_S_RUN || seq != IEEE80211_AUTH_OPEN_REQUEST) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: discard auth from %s; state %u, seq %u\n", __func__, ether_sprintf(wh->i_addr2), ic->ic_state, seq)); ic->ic_stats.is_rx_bad_auth++; return; } if (ni == ic->ic_bss) { ni = ieee80211_alloc_node(ic, wh->i_addr2); if (ni == NULL) { ic->ic_stats.is_rx_nodealloc++; return; } IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; ni->ni_chan = ic->ic_bss->ni_chan; } IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ("station %s %s authenticated (open)\n", ether_sprintf(ni->ni_macaddr), ((ni->ni_state != IEEE80211_STA_CACHE) ? "newly" : "already"))); ieee80211_node_newstate(ni, IEEE80211_STA_AUTH); break; case IEEE80211_M_STA: if (ic->ic_state != IEEE80211_S_AUTH || seq != IEEE80211_AUTH_OPEN_RESPONSE) { ic->ic_stats.is_rx_bad_auth++; IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: discard auth from %s; state %u, seq %u\n", __func__, ether_sprintf(wh->i_addr2), ic->ic_state, seq)); return; } if (status != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ("open authentication failed (reason %d) for %s\n", status, ether_sprintf(wh->i_addr3))); if (ni != ic->ic_bss) ni->ni_fails++; ic->ic_stats.is_rx_auth_fail++; return; } ieee80211_new_state(ic, IEEE80211_S_ASSOC, wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); break; case IEEE80211_M_MONITOR: break; } } /* TBD send appropriate responses on error? */ static void ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, u_int8_t *frm, u_int8_t *efrm, struct ieee80211_node *ni, int rssi, u_int32_t rstamp, u_int16_t seq, u_int16_t status) { u_int8_t *challenge = NULL; int i; if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: WEP is off\n", __func__)); return; } if (frm + 1 < efrm) { if (frm[1] + 2 > efrm - frm) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: elt %d %d bytes too long\n", __func__, frm[0], (frm[1] + 2) - (int)(efrm - frm))); ic->ic_stats.is_rx_bad_auth++; return; } if (*frm == IEEE80211_ELEMID_CHALLENGE) challenge = frm; frm += frm[1] + 2; } switch (seq) { case IEEE80211_AUTH_SHARED_CHALLENGE: case IEEE80211_AUTH_SHARED_RESPONSE: if (challenge == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: no challenge sent\n", __func__)); ic->ic_stats.is_rx_bad_auth++; return; } if (challenge[1] != IEEE80211_CHALLENGE_LEN) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: bad challenge len %d\n", __func__, challenge[1])); ic->ic_stats.is_rx_bad_auth++; return; } default: break; } switch (ic->ic_opmode) { case IEEE80211_M_MONITOR: case IEEE80211_M_AHDEMO: case IEEE80211_M_IBSS: IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: unexpected operating mode\n", __func__)); return; case IEEE80211_M_HOSTAP: if (ic->ic_state != IEEE80211_S_RUN) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: not running\n", __func__)); return; } switch (seq) { case IEEE80211_AUTH_SHARED_REQUEST: if (ni == ic->ic_bss) { ni = ieee80211_alloc_node(ic, wh->i_addr2); if (ni == NULL) { ic->ic_stats.is_rx_nodealloc++; return; } IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid); ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; ni->ni_chan = ic->ic_bss->ni_chan; } if (ni->ni_challenge == NULL) ni->ni_challenge = (u_int32_t*)malloc( IEEE80211_CHALLENGE_LEN, M_DEVBUF, M_NOWAIT); if (ni->ni_challenge == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: challenge alloc failed\n", __func__)); /* XXX statistic */ return; } for (i = IEEE80211_CHALLENGE_LEN / sizeof(u_int32_t); --i >= 0; ) ni->ni_challenge[i] = arc4random(); IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ("shared key %sauth request from station %s\n", ((ni->ni_state != IEEE80211_STA_CACHE) ? "" : "re"), ether_sprintf(ni->ni_macaddr))); break; case IEEE80211_AUTH_SHARED_RESPONSE: if (ni == ic->ic_bss) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: unknown STA\n", __func__)); return; } if (ni->ni_challenge == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: no challenge recorded\n", __func__)); ic->ic_stats.is_rx_bad_auth++; return; } if (memcmp(ni->ni_challenge, &challenge[2], challenge[1]) != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: challenge mismatch\n", __func__)); ic->ic_stats.is_rx_auth_fail++; return; } IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ("station %s authenticated (shared key)\n", ether_sprintf(ni->ni_macaddr))); ieee80211_node_newstate(ni, IEEE80211_STA_AUTH); break; default: IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: bad shared key auth seq %d from %s\n", __func__, seq, ether_sprintf(wh->i_addr2))); ic->ic_stats.is_rx_bad_auth++; return; } IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); break; case IEEE80211_M_STA: if (ic->ic_state != IEEE80211_S_AUTH) return; switch (seq) { case IEEE80211_AUTH_SHARED_PASS: if (ni->ni_challenge != NULL) { FREE(ni->ni_challenge, M_DEVBUF); ni->ni_challenge = NULL; } if (status != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, ("%s: auth failed (reason %d) for %s\n", __func__, status, ether_sprintf(wh->i_addr3))); if (ni != ic->ic_bss) ni->ni_fails++; ic->ic_stats.is_rx_auth_fail++; return; } ieee80211_new_state(ic, IEEE80211_S_ASSOC, wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); break; case IEEE80211_AUTH_SHARED_CHALLENGE: if (ni->ni_challenge == NULL) ni->ni_challenge = (u_int32_t*)malloc( challenge[1], M_DEVBUF, M_NOWAIT); if (ni->ni_challenge == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: challenge alloc failed\n", __func__)); /* XXX statistic */ return; } memcpy(ni->ni_challenge, &challenge[2], challenge[1]); IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); break; default: IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: bad seq %d from %s\n", __func__, seq, ether_sprintf(wh->i_addr2))); ic->ic_stats.is_rx_bad_auth++; return; } break; } } void ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, int subtype, int rssi, u_int32_t rstamp) { #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) struct ieee80211_frame *wh; u_int8_t *frm, *efrm; u_int8_t *ssid, *rates, *xrates; int is_new, reassoc, resp; wh = mtod(m0, struct ieee80211_frame *); frm = (u_int8_t *)&wh[1]; efrm = mtod(m0, u_int8_t *) + m0->m_len; switch (subtype) { case IEEE80211_FC0_SUBTYPE_PROBE_RESP: case IEEE80211_FC0_SUBTYPE_BEACON: { u_int8_t *tstamp, *bintval, *capinfo, *country; u_int8_t chan, bchan, fhindex, erp; u_int16_t fhdwell; /* * We process beacon/probe response frames for: * o station mode: to collect state * updates such as 802.11g slot time and for passive * scanning of APs * o adhoc mode: to discover neighbors * o hostap mode: for passive scanning of neighbor APs * o when scanning * In other words, in all modes other than monitor (which * does not process incoming packets) and adhoc-demo (which * does not use management frames at all). */ #ifdef DIAGNOSTIC if (ic->ic_opmode != IEEE80211_M_STA && ic->ic_opmode != IEEE80211_M_IBSS && ic->ic_opmode != IEEE80211_M_HOSTAP && ic->ic_state != IEEE80211_S_SCAN) { panic("%s: impossible", __func__); } #endif /* * beacon/probe response frame format * [8] time stamp * [2] beacon interval * [2] capability information * [tlv] ssid * [tlv] supported rates * [tlv] country information * [tlv] parameter set (FH/DS) * [tlv] erp information * [tlv] extended supported rates */ IEEE80211_VERIFY_LENGTH(efrm - frm, 12); tstamp = frm; frm += 8; bintval = frm; frm += 2; capinfo = frm; frm += 2; ssid = rates = xrates = country = NULL; bchan = ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan); chan = bchan; fhdwell = 0; fhindex = 0; erp = 0; while (frm < efrm) { switch (*frm) { case IEEE80211_ELEMID_SSID: ssid = frm; break; case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_COUNTRY: country = frm; break; case IEEE80211_ELEMID_FHPARMS: if (ic->ic_phytype == IEEE80211_T_FH) { fhdwell = (frm[3] << 8) | frm[2]; chan = IEEE80211_FH_CHAN(frm[4], frm[5]); fhindex = frm[6]; } break; case IEEE80211_ELEMID_DSPARMS: /* * XXX hack this since depending on phytype * is problematic for multi-mode devices. */ if (ic->ic_phytype != IEEE80211_T_FH) chan = frm[2]; break; case IEEE80211_ELEMID_TIM: break; case IEEE80211_ELEMID_IBSSPARMS: break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; case IEEE80211_ELEMID_ERP: if (frm[1] != 1) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, ("%s: invalid ERP element; " "length %u, expecting 1\n", __func__, frm[1])); ic->ic_stats.is_rx_elem_toobig++; break; } erp = frm[2]; break; default: IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, ("%s: element id %u/len %u ignored\n", __func__, *frm, frm[1])); ic->ic_stats.is_rx_elem_unknown++; break; } frm += frm[1] + 2; } IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); if ( #if IEEE80211_CHAN_MAX < 255 chan > IEEE80211_CHAN_MAX || #endif isclr(ic->ic_chan_active, chan)) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, ("%s: ignore %s with invalid channel %u\n", __func__, ISPROBE(subtype) ? "probe response" : "beacon", chan)); ic->ic_stats.is_rx_badchan++; return; } if (chan != bchan && ic->ic_phytype != IEEE80211_T_FH) { /* * Frame was received on a channel different from the * one indicated in the DS params element id; * silently discard it. * * NB: this can happen due to signal leakage. * But we should take it for FH phy because * the rssi value should be correct even for * different hop pattern in FH. */ IEEE80211_DPRINTF(ic, IEEE80211_MSG_ELEMID, ("%s: ignore %s on channel %u marked " "for channel %u\n", __func__, ISPROBE(subtype) ? "probe response" : "beacon", bchan, chan)); ic->ic_stats.is_rx_chanmismatch++; return; } /* * Use mac and channel for lookup so we collect all * potential AP's when scanning. Otherwise we may * see the same AP on multiple channels and will only * record the last one. We could filter APs here based * on rssi, etc. but leave that to the end of the scan * so we can keep the selection criteria in one spot. * This may result in a bloat of the scanned AP list but * it shouldn't be too much. */ ni = ieee80211_find_node_for_beacon(ic, wh->i_addr2, &ic->ic_channels[chan], ssid); #ifdef IEEE80211_DEBUG if (ieee80211_debug && (ni == NULL || ic->ic_state == IEEE80211_S_SCAN)) { printf("%s: %s%s on chan %u (bss chan %u) ", __func__, (ni == NULL ? "new " : ""), ISPROBE(subtype) ? "probe response" : "beacon", chan, bchan); ieee80211_print_essid(ssid + 2, ssid[1]); printf(" from %s\n", ether_sprintf(wh->i_addr2)); printf("%s: caps 0x%x bintval %u erp 0x%x\n", __func__, le16toh(*(u_int16_t *)capinfo), le16toh(*(u_int16_t *)bintval), erp); if (country) { int i; printf("%s: country info", __func__); for (i = 0; i < country[1]; i++) printf(" %02x", country[i+2]); printf("\n"); } } #endif if (ni == NULL) { ni = ieee80211_alloc_node(ic, wh->i_addr2); if (ni == NULL) return; is_new = 1; } else is_new = 0; if (ssid[1] != 0 && ni->ni_esslen == 0) { /* * Update ESSID at probe response to adopt hidden AP by * Lucent/Cisco, which announces null ESSID in beacon. */ ni->ni_esslen = ssid[1]; memset(ni->ni_essid, 0, sizeof(ni->ni_essid)); memcpy(ni->ni_essid, ssid + 2, ssid[1]); } IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; memcpy(ni->ni_tstamp, tstamp, sizeof(ni->ni_tstamp)); ni->ni_intval = le16toh(*(u_int16_t *)bintval); ni->ni_capinfo = le16toh(*(u_int16_t *)capinfo); /* XXX validate channel # */ ni->ni_chan = &ic->ic_channels[chan]; ni->ni_fhdwell = fhdwell; ni->ni_fhindex = fhindex; ni->ni_erp = erp; /* NB: must be after ni_chan is setup */ ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT); /* * When scanning we record results (nodes) with a zero * refcnt. Otherwise we want to hold the reference for * ibss neighbors so the nodes don't get released prematurely. * Anything else can be discarded (XXX and should be handled * above so we don't do so much work). */ if (ic->ic_opmode == IEEE80211_M_IBSS || (is_new && ISPROBE(subtype))) { /* * Fake an association so the driver can setup it's * private state. The rate set has been setup above; * there is no handshake as in ap/station operation. */ if (ic->ic_newassoc) (*ic->ic_newassoc)(ic, ni, 1); } break; } case IEEE80211_FC0_SUBTYPE_PROBE_REQ: { u_int8_t rate; if (ic->ic_opmode == IEEE80211_M_STA) return; if (ic->ic_state != IEEE80211_S_RUN) return; /* * prreq frame format * [tlv] ssid * [tlv] supported rates * [tlv] extended supported rates */ ssid = rates = xrates = NULL; while (frm < efrm) { switch (*frm) { case IEEE80211_ELEMID_SSID: ssid = frm; break; case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; } frm += frm[1] + 2; } IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); IEEE80211_VERIFY_SSID(ic->ic_bss, ssid, "probe"); if (ni == ic->ic_bss) { ni = ieee80211_dup_bss(ic, wh->i_addr2); if (ni == NULL) return; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, ("%s: new probe req from %s\n", __func__, ether_sprintf(wh->i_addr2))); } ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; rate = ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (rate & IEEE80211_RATE_BASIC) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_XRATE, ("%s: rate negotiation failed: %s\n", __func__,ether_sprintf(wh->i_addr2))); } else { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); } break; } case IEEE80211_FC0_SUBTYPE_AUTH: { u_int16_t algo, seq, status; /* * auth frame format * [2] algorithm * [2] sequence * [2] status * [tlv*] challenge */ IEEE80211_VERIFY_LENGTH(efrm - frm, 6); algo = le16toh(*(u_int16_t *)frm); seq = le16toh(*(u_int16_t *)(frm + 2)); status = le16toh(*(u_int16_t *)(frm + 4)); IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("%s: algorithm %d seq %d from %s\n", __func__, algo, seq, ether_sprintf(wh->i_addr2))); if (algo == IEEE80211_AUTH_ALG_SHARED) ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, rstamp, seq, status); else if (algo == IEEE80211_AUTH_ALG_OPEN) ieee80211_auth_open(ic, wh, ni, rssi, rstamp, seq, status); else { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: unsupported auth algorithm %d from %s\n", __func__, algo, ether_sprintf(wh->i_addr2))); ic->ic_stats.is_rx_auth_unsupported++; return; } break; } case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { u_int16_t capinfo, bintval; if (ic->ic_opmode != IEEE80211_M_HOSTAP || (ic->ic_state != IEEE80211_S_RUN)) return; if (subtype == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) { reassoc = 1; resp = IEEE80211_FC0_SUBTYPE_REASSOC_RESP; } else { reassoc = 0; resp = IEEE80211_FC0_SUBTYPE_ASSOC_RESP; } /* * asreq frame format * [2] capability information * [2] listen interval * [6*] current AP address (reassoc only) * [tlv] ssid * [tlv] supported rates * [tlv] extended supported rates */ IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4)); if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: ignore assoc request with bss %s not " "our own\n", __func__, ether_sprintf(wh->i_addr2))); ic->ic_stats.is_rx_assoc_bss++; return; } capinfo = le16toh(*(u_int16_t *)frm); frm += 2; bintval = le16toh(*(u_int16_t *)frm); frm += 2; if (reassoc) frm += 6; /* ignore current AP info */ ssid = rates = xrates = NULL; while (frm < efrm) { switch (*frm) { case IEEE80211_ELEMID_SSID: ssid = frm; break; case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; } frm += frm[1] + 2; } IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); IEEE80211_VERIFY_SSID(ic->ic_bss, ssid, reassoc ? "reassoc" : "assoc"); if (ni->ni_state != IEEE80211_STA_AUTH && ni->ni_state != IEEE80211_STA_ASSOC) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: deny %sassoc from %s, not authenticated\n", __func__, reassoc ? "re" : "", ether_sprintf(wh->i_addr2))); ni = ieee80211_dup_bss(ic, wh->i_addr2); if (ni != NULL) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_ASSOC_NOT_AUTHED); } ic->ic_stats.is_rx_assoc_notauth++; return; } /* discard challenge after association */ if (ni->ni_challenge != NULL) { FREE(ni->ni_challenge, M_DEVBUF); ni->ni_challenge = NULL; } /* XXX per-node cipher suite */ /* XXX some stations use the privacy bit for handling APs that suport both encrypted and unencrypted traffic */ if ((capinfo & IEEE80211_CAPINFO_ESS) == 0 || (capinfo & IEEE80211_CAPINFO_PRIVACY) != ((ic->ic_flags & IEEE80211_F_PRIVACY) ? IEEE80211_CAPINFO_PRIVACY : 0)) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: capability mismatch %x for %s\n", __func__, capinfo, ether_sprintf(wh->i_addr2))); IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_CAPINFO); ieee80211_node_leave(ic, ni); ic->ic_stats.is_rx_assoc_capmismatch++; return; } ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (ni->ni_rates.rs_nrates == 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: rate mismatch for %s\n", __func__, ether_sprintf(wh->i_addr2))); /* XXX what rate will we send this at? */ IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_BASIC_RATE); ieee80211_node_leave(ic, ni); ic->ic_stats.is_rx_assoc_norate++; return; } ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; ni->ni_intval = bintval; ni->ni_capinfo = capinfo; ni->ni_chan = ic->ic_bss->ni_chan; ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; ni->ni_fhindex = ic->ic_bss->ni_fhindex; ieee80211_node_join(ic, ni, resp); break; } case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { u_int16_t status; if (ic->ic_opmode != IEEE80211_M_STA || ic->ic_state != IEEE80211_S_ASSOC) { ic->ic_stats.is_rx_mgtdiscard++; return; } /* * asresp frame format * [2] capability information * [2] status * [2] association ID * [tlv] supported rates * [tlv] extended supported rates */ IEEE80211_VERIFY_LENGTH(efrm - frm, 6); ni = ic->ic_bss; ni->ni_capinfo = le16toh(*(u_int16_t *)frm); frm += 2; status = le16toh(*(u_int16_t *)frm); frm += 2; if (status != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, ("%sassociation failed (reason %d) for %s\n", ISREASSOC(subtype) ? "re" : "", status, ether_sprintf(wh->i_addr3))); if (ni != ic->ic_bss) ni->ni_fails++; ic->ic_stats.is_rx_auth_fail++; return; } ni->ni_associd = le16toh(*(u_int16_t *)frm); frm += 2; rates = xrates = NULL; while (frm < efrm) { switch (*frm) { case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; } frm += frm[1] + 2; } IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); ieee80211_setup_rates(ic, ni, rates, xrates, IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (ni->ni_rates.rs_nrates != 0) ieee80211_new_state(ic, IEEE80211_S_RUN, wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); break; } case IEEE80211_FC0_SUBTYPE_DEAUTH: { u_int16_t reason; /* * deauth frame format * [2] reason */ IEEE80211_VERIFY_LENGTH(efrm - frm, 2); reason = le16toh(*(u_int16_t *)frm); ic->ic_stats.is_rx_deauth++; switch (ic->ic_opmode) { case IEEE80211_M_STA: ieee80211_new_state(ic, IEEE80211_S_AUTH, wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); break; case IEEE80211_M_HOSTAP: if (ni != ic->ic_bss) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, ("station %s deauthenticated by " "peer (reason %d)\n", ether_sprintf(ni->ni_macaddr), reason)); ieee80211_node_leave(ic, ni); } break; default: break; } break; } case IEEE80211_FC0_SUBTYPE_DISASSOC: { u_int16_t reason; /* * disassoc frame format * [2] reason */ IEEE80211_VERIFY_LENGTH(efrm - frm, 2); reason = le16toh(*(u_int16_t *)frm); ic->ic_stats.is_rx_disassoc++; switch (ic->ic_opmode) { case IEEE80211_M_STA: ieee80211_new_state(ic, IEEE80211_S_ASSOC, wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK); break; case IEEE80211_M_HOSTAP: if (ni != ic->ic_bss) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, ("station %s disassociated by " "peer (reason %d)\n", ether_sprintf(ni->ni_macaddr), reason)); ieee80211_node_leave(ic, ni); } break; default: break; } break; } default: IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, ("%s: mgmt frame with subtype 0x%x not handled\n", __func__, subtype)); ic->ic_stats.is_rx_badsubtype++; break; } } static void ieee80211_recv_pspoll(struct ieee80211com *ic, struct mbuf *m0, int rssi, u_int32_t rstamp) { struct ifnet *ifp = &ic->ic_if; struct ieee80211_frame *wh; struct ieee80211_node *ni; struct mbuf *m; u_int16_t aid; if (ic->ic_set_tim == NULL) /* No powersaving functionality */ return; wh = mtod(m0, struct ieee80211_frame *); if ((ni = ieee80211_find_node(ic, wh->i_addr2)) == NULL) { if (ifp->if_flags & IFF_DEBUG) printf("%s: station %s sent bogus power save poll\n", ifp->if_xname, ether_sprintf(wh->i_addr2)); return; } memcpy(&aid, wh->i_dur, sizeof(wh->i_dur)); if ((aid & 0xc000) != 0xc000) { if (ifp->if_flags & IFF_DEBUG) printf("%s: station %s sent bogus aid %x\n", ifp->if_xname, ether_sprintf(wh->i_addr2), aid); return; } if (aid != ni->ni_associd) { if (ifp->if_flags & IFF_DEBUG) printf("%s: station %s aid %x doesn't match pspoll " "aid %x\n", ifp->if_xname, ether_sprintf(wh->i_addr2), ni->ni_associd, aid); return; } /* Okay, take the first queued packet and put it out... */ IF_DEQUEUE(&ni->ni_savedq, m); if (m == NULL) { if (ifp->if_flags & IFF_DEBUG) printf("%s: station %s sent pspoll, " "but no packets are saved\n", ifp->if_xname, ether_sprintf(wh->i_addr2)); return; } wh = mtod(m, struct ieee80211_frame *); /* * If this is the last packet, turn off the TIM fields. * If there are more packets, set the more packets bit. */ if (IF_IS_EMPTY(&ni->ni_savedq)) { if (ic->ic_set_tim) ic->ic_set_tim(ic, ni->ni_associd, 0); } else { wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; } if (ifp->if_flags & IFF_DEBUG) printf("%s: enqueued power saving packet for station %s\n", ifp->if_xname, ether_sprintf(ni->ni_macaddr)); IF_ENQUEUE(&ic->ic_pwrsaveq, m); (*ifp->if_start)(ifp); } static int do_slow_print(struct ieee80211com *ic, int *did_print) { if ((ic->ic_if.if_flags & IFF_LINK0) == 0) return 0; if (!*did_print && (ic->ic_if.if_flags & IFF_DEBUG) == 0 && !ratecheck(&ic->ic_last_merge_print, &ieee80211_merge_print_intvl)) return 0; *did_print = 1; return 1; } /* ieee80211_ibss_merge helps merge 802.11 ad hoc networks. The * convention, set by the Wireless Ethernet Compatibility Alliance * (WECA), is that an 802.11 station will change its BSSID to match * the "oldest" 802.11 ad hoc network, on the same channel, that * has the station's desired SSID. The "oldest" 802.11 network * sends beacons with the greatest TSF timestamp. * * Return ENETRESET if the BSSID changed, 0 otherwise. * * XXX Perhaps we should compensate for the time that elapses * between the MAC receiving the beacon and the host processing it * in ieee80211_ibss_merge. */ int ieee80211_ibss_merge(struct ieee80211com *ic, struct ieee80211_node *ni) { int did_print = 0; if (memcmp(ni->ni_bssid, ic->ic_bss->ni_bssid, IEEE80211_ADDR_LEN) == 0) return 0; if (ieee80211_match_bss(ic, ni) != 0) return 0; ic->ic_flags &= ~IEEE80211_F_SIBSS; /* negotiate rates with new IBSS */ ieee80211_fix_rate(ic, ni, IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (ni->ni_rates.rs_nrates == 0) { if (do_slow_print(ic, &did_print)) { printf("%s: rates mismatch, BSSID %s\n", ic->ic_if.if_xname, ether_sprintf(ni->ni_bssid)); } return 0; } printf("%s: bss merge %s -> ", ic->ic_if.if_xname, ether_sprintf(ic->ic_bss->ni_bssid)); (*ic->ic_node_copy)(ic, ic->ic_bss, ni); ieee80211_node_newstate(ic->ic_bss, IEEE80211_STA_BSS); printf("%s\n", ether_sprintf(ic->ic_bss->ni_bssid)); return ENETRESET; } #undef IEEE80211_VERIFY_LENGTH #undef IEEE80211_VERIFY_ELEMENT