/*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002-2007 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. * * 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 __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef IEEE80211_DEBUG #include /* * 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_flags & IEEE80211_F_SCAN); case IEEE80211_FC0_SUBTYPE_PROBE_REQ: return (ic->ic_opmode == IEEE80211_M_IBSS); } return 1; } static const uint8_t *ieee80211_getbssid(struct ieee80211com *, const struct ieee80211_frame *); #endif /* IEEE80211_DEBUG */ static struct mbuf *ieee80211_defrag(struct ieee80211com *, struct ieee80211_node *, struct mbuf *, int); static struct mbuf *ieee80211_decap(struct ieee80211com *, struct mbuf *, int); static void ieee80211_send_error(struct ieee80211com *, struct ieee80211_node *, const uint8_t *mac, int subtype, int arg); static struct mbuf *ieee80211_decap_fastframe(struct ieee80211com *, struct ieee80211_node *, struct mbuf *); static void ieee80211_recv_pspoll(struct ieee80211com *, struct ieee80211_node *, struct mbuf *); /* * 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. */ int ieee80211_input(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp) { #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0) #define HAS_SEQ(type) ((type & 0x4) == 0) struct ifnet *ifp = ic->ic_ifp; struct ieee80211_frame *wh; struct ieee80211_key *key; struct ether_header *eh; int hdrspace, need_tap; uint8_t dir, type, subtype, qos; uint8_t *bssid; uint16_t rxseq; if (m->m_flags & M_AMPDU) { /* * Fastpath for A-MPDU reorder q resubmission. Frames * w/ M_AMPDU marked have already passed through here * but were received out of order and been held on the * reorder queue. When resubmitted they are marked * with the M_AMPDU flag and we can bypass most of the * normal processing. */ wh = mtod(m, struct ieee80211_frame *); type = IEEE80211_FC0_TYPE_DATA; dir = wh->i_fc[1] & IEEE80211_FC1_DIR_MASK; subtype = IEEE80211_FC0_SUBTYPE_QOS; hdrspace = ieee80211_hdrspace(ic, wh); /* XXX optimize? */ need_tap = 0; goto resubmit_ampdu; } KASSERT(ni != NULL, ("null node")); ni->ni_inact = ni->ni_inact_reload; need_tap = 1; /* mbuf need to be tapped. */ type = -1; /* undefined */ /* * In monitor mode, send everything directly to bpf. * XXX may want to include the CRC */ if (ic->ic_opmode == IEEE80211_M_MONITOR) goto out; if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_min)) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, "too short (1): len %u", m->m_pkthdr.len); ic->ic_stats.is_rx_tooshort++; goto out; } /* * Bit of a cheat here, we use a pointer for a 3-address * frame format but don't reference fields past outside * ieee80211_frame_min w/o first validating the data is * present. */ wh = mtod(m, struct ieee80211_frame *); if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != IEEE80211_FC0_VERSION_0) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, "wrong version %x", 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; subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) { switch (ic->ic_opmode) { case IEEE80211_M_STA: bssid = wh->i_addr2; if (!IEEE80211_ADDR_EQ(bssid, ni->ni_bssid)) { /* not interested in */ IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, bssid, NULL, "%s", "not to bss"); ic->ic_stats.is_rx_wrongbss++; goto out; } break; case IEEE80211_M_IBSS: case IEEE80211_M_AHDEMO: case IEEE80211_M_HOSTAP: if (dir != IEEE80211_FC1_DIR_NODS) bssid = wh->i_addr1; else if (type == IEEE80211_FC0_TYPE_CTL) bssid = wh->i_addr1; else { if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, "too short (2): len %u", m->m_pkthdr.len); ic->ic_stats.is_rx_tooshort++; goto out; } bssid = wh->i_addr3; } if (type != IEEE80211_FC0_TYPE_DATA) break; /* * Data frame, validate the bssid. */ if (!IEEE80211_ADDR_EQ(bssid, ic->ic_bss->ni_bssid) && !IEEE80211_ADDR_EQ(bssid, ifp->if_broadcastaddr)) { /* not interested in */ IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, bssid, NULL, "%s", "not to bss"); ic->ic_stats.is_rx_wrongbss++; goto out; } /* * For adhoc mode we cons up a node when it doesn't * exist. This should probably done after an ACL check. */ if (ni == ic->ic_bss && ic->ic_opmode != IEEE80211_M_HOSTAP && !IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { /* * Fake up a node for this newly * discovered member of the IBSS. */ ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, wh->i_addr2); if (ni == NULL) { /* NB: stat kept for alloc failure */ goto err; } } break; default: goto out; } ni->ni_rssi = rssi; ni->ni_noise = noise; ni->ni_rstamp = rstamp; if (HAS_SEQ(type)) { uint8_t tid; if (IEEE80211_QOS_HAS_SEQ(wh)) { tid = ((struct ieee80211_qosframe *)wh)-> i_qos[0] & IEEE80211_QOS_TID; if (TID_TO_WME_AC(tid) >= WME_AC_VI) ic->ic_wme.wme_hipri_traffic++; tid++; } else tid = IEEE80211_NONQOS_TID; rxseq = le16toh(*(uint16_t *)wh->i_seq); if ((ni->ni_flags & IEEE80211_NODE_HT) == 0 && (wh->i_fc[1] & IEEE80211_FC1_RETRY) && SEQ_LEQ(rxseq, ni->ni_rxseqs[tid])) { /* duplicate, discard */ IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, bssid, "duplicate", "seqno <%u,%u> fragno <%u,%u> tid %u", rxseq >> IEEE80211_SEQ_SEQ_SHIFT, ni->ni_rxseqs[tid] >> IEEE80211_SEQ_SEQ_SHIFT, rxseq & IEEE80211_SEQ_FRAG_MASK, ni->ni_rxseqs[tid] & IEEE80211_SEQ_FRAG_MASK, tid); ic->ic_stats.is_rx_dup++; IEEE80211_NODE_STAT(ni, rx_dup); goto out; } ni->ni_rxseqs[tid] = rxseq; } } switch (type) { case IEEE80211_FC0_TYPE_DATA: hdrspace = ieee80211_hdrspace(ic, wh); if (m->m_len < hdrspace && (m = m_pullup(m, hdrspace)) == NULL) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, NULL, "data too short: expecting %u", hdrspace); ic->ic_stats.is_rx_tooshort++; goto out; /* XXX */ } switch (ic->ic_opmode) { case IEEE80211_M_STA: if (dir != IEEE80211_FC1_DIR_FROMDS) { IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "data", "unknown dir 0x%x", dir); ic->ic_stats.is_rx_wrongdir++; 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. */ IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, NULL, "%s", "multicast echo"); ic->ic_stats.is_rx_mcastecho++; goto out; } break; case IEEE80211_M_IBSS: case IEEE80211_M_AHDEMO: if (dir != IEEE80211_FC1_DIR_NODS) { IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "data", "unknown dir 0x%x", dir); ic->ic_stats.is_rx_wrongdir++; goto out; } /* XXX no power-save support */ break; case IEEE80211_M_HOSTAP: if (dir != IEEE80211_FC1_DIR_TODS) { IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "data", "unknown dir 0x%x", dir); ic->ic_stats.is_rx_wrongdir++; goto out; } /* check if source STA is associated */ if (ni == ic->ic_bss) { IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "data", "%s", "unknown src"); ieee80211_send_error(ic, ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_NOT_AUTHED); ic->ic_stats.is_rx_notassoc++; goto err; } if (ni->ni_associd == 0) { IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "data", "%s", "unassoc src"); IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DISASSOC, IEEE80211_REASON_NOT_ASSOCED); ic->ic_stats.is_rx_notassoc++; goto err; } /* * Check for power save state change. * XXX out-of-order A-MPDU frames? */ if (((wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) ^ (ni->ni_flags & IEEE80211_NODE_PWR_MGT))) ieee80211_node_pwrsave(ni, wh->i_fc[1] & IEEE80211_FC1_PWR_MGT); break; default: /* XXX here to keep compiler happy */ goto out; } /* * Handle A-MPDU re-ordering. The station must be * associated and negotiated HT. The frame must be * a QoS frame (not QoS null data) and not previously * processed for A-MPDU re-ordering. If the frame is * to be processed directly then ieee80211_ampdu_reorder * will return 0; otherwise it has consumed the mbuf * and we should do nothing more with it. */ if ((ni->ni_flags & IEEE80211_NODE_HT) && subtype == IEEE80211_FC0_SUBTYPE_QOS && ieee80211_ampdu_reorder(ni, m) != 0) { m = NULL; goto out; } resubmit_ampdu: /* * Handle privacy requirements. Note that we * must not be preempted from here until after * we (potentially) call ieee80211_crypto_demic; * otherwise we may violate assumptions in the * crypto cipher modules used to do delayed update * of replay sequence numbers. */ if (wh->i_fc[1] & IEEE80211_FC1_WEP) { if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { /* * Discard encrypted frames when privacy is off. */ IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "WEP", "%s", "PRIVACY off"); ic->ic_stats.is_rx_noprivacy++; IEEE80211_NODE_STAT(ni, rx_noprivacy); goto out; } key = ieee80211_crypto_decap(ic, ni, m, hdrspace); if (key == NULL) { /* NB: stats+msgs handled in crypto_decap */ IEEE80211_NODE_STAT(ni, rx_wepfail); goto out; } wh = mtod(m, struct ieee80211_frame *); wh->i_fc[1] &= ~IEEE80211_FC1_WEP; } else { /* XXX M_WEP and IEEE80211_F_PRIVACY */ key = NULL; } /* * Save QoS bits for use below--before we strip the header. */ if (subtype == IEEE80211_FC0_SUBTYPE_QOS) { qos = (dir == IEEE80211_FC1_DIR_DSTODS) ? ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] : ((struct ieee80211_qosframe *)wh)->i_qos[0]; } else qos = 0; /* * Next up, any fragmentation. */ if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) { m = ieee80211_defrag(ic, ni, m, hdrspace); if (m == NULL) { /* Fragment dropped or frame not complete yet */ goto out; } } wh = NULL; /* no longer valid, catch any uses */ /* * Next strip any MSDU crypto bits. */ if (key != NULL && !ieee80211_crypto_demic(ic, key, m, 0)) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, ni->ni_macaddr, "data", "%s", "demic error"); ic->ic_stats.is_rx_demicfail++; IEEE80211_NODE_STAT(ni, rx_demicfail); goto out; } /* copy to listener after decrypt */ if (bpf_peers_present(ic->ic_rawbpf)) bpf_mtap(ic->ic_rawbpf, m); need_tap = 0; /* * Finally, strip the 802.11 header. */ m = ieee80211_decap(ic, m, hdrspace); if (m == NULL) { /* don't count Null data frames as errors */ if (subtype == IEEE80211_FC0_SUBTYPE_NODATA || subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL) goto out; IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, ni->ni_macaddr, "data", "%s", "decap error"); ic->ic_stats.is_rx_decap++; IEEE80211_NODE_STAT(ni, rx_decap); goto err; } eh = mtod(m, struct ether_header *); if (!ieee80211_node_is_authorized(ni)) { /* * Deny any non-PAE frames received prior to * authorization. For open/shared-key * authentication the port is mark authorized * after authentication completes. For 802.1x * the port is not marked authorized by the * authenticator until the handshake has completed. */ if (eh->ether_type != htons(ETHERTYPE_PAE)) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_INPUT, eh->ether_shost, "data", "unauthorized port: ether type 0x%x len %u", eh->ether_type, m->m_pkthdr.len); ic->ic_stats.is_rx_unauth++; IEEE80211_NODE_STAT(ni, rx_unauth); goto err; } } else { /* * When denying unencrypted frames, discard * any non-PAE frames received without encryption. */ if ((ic->ic_flags & IEEE80211_F_DROPUNENC) && (key == NULL && (m->m_flags & M_WEP) == 0) && eh->ether_type != htons(ETHERTYPE_PAE)) { /* * Drop unencrypted frames. */ ic->ic_stats.is_rx_unencrypted++; IEEE80211_NODE_STAT(ni, rx_unencrypted); goto out; } } /* XXX require HT? */ if (qos & IEEE80211_QOS_AMSDU) { m = ieee80211_decap_amsdu(ni, m); if (m == NULL) return IEEE80211_FC0_TYPE_DATA; } else if ((ni->ni_ath_flags & IEEE80211_NODE_FF) && #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) m->m_pkthdr.len >= 3*FF_LLC_SIZE) { struct llc *llc; /* * Check for fast-frame tunnel encapsulation. */ if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, "fast-frame", "%s", "m_pullup(llc) failed"); ic->ic_stats.is_rx_tooshort++; return IEEE80211_FC0_TYPE_DATA; } llc = (struct llc *)(mtod(m, uint8_t *) + sizeof(struct ether_header)); if (llc->llc_snap.ether_type == htons(ATH_FF_ETH_TYPE)) { m_adj(m, FF_LLC_SIZE); m = ieee80211_decap_fastframe(ic, ni, m); if (m == NULL) return IEEE80211_FC0_TYPE_DATA; } } #undef FF_LLC_SIZE ieee80211_deliver_data(ic, ni, m); return IEEE80211_FC0_TYPE_DATA; case IEEE80211_FC0_TYPE_MGT: ic->ic_stats.is_rx_mgmt++; IEEE80211_NODE_STAT(ni, rx_mgmt); if (dir != IEEE80211_FC1_DIR_NODS) { IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "data", "unknown dir 0x%x", dir); ic->ic_stats.is_rx_wrongdir++; goto err; } if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, "mgt", "too short: len %u", m->m_pkthdr.len); ic->ic_stats.is_rx_tooshort++; goto out; } #ifdef IEEE80211_DEBUG if ((ieee80211_msg_debug(ic) && doprint(ic, subtype)) || ieee80211_msg_dumppkts(ic)) { if_printf(ic->ic_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 (wh->i_fc[1] & IEEE80211_FC1_WEP) { if (subtype != IEEE80211_FC0_SUBTYPE_AUTH) { /* * Only shared key auth frames with a challenge * should be encrypted, discard all others. */ IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], "%s", "WEP set but not permitted"); ic->ic_stats.is_rx_mgtdiscard++; /* XXX */ goto out; } if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { /* * Discard encrypted frames when privacy is off. */ IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, "mgt", "%s", "WEP set but PRIVACY off"); ic->ic_stats.is_rx_noprivacy++; goto out; } hdrspace = ieee80211_hdrspace(ic, wh); key = ieee80211_crypto_decap(ic, ni, m, hdrspace); if (key == NULL) { /* NB: stats+msgs handled in crypto_decap */ goto out; } wh = mtod(m, struct ieee80211_frame *); wh->i_fc[1] &= ~IEEE80211_FC1_WEP; } if (bpf_peers_present(ic->ic_rawbpf)) bpf_mtap(ic->ic_rawbpf, m); (*ic->ic_recv_mgmt)(ic, m, ni, subtype, rssi, noise, rstamp); m_freem(m); return IEEE80211_FC0_TYPE_MGT; case IEEE80211_FC0_TYPE_CTL: ic->ic_stats.is_rx_ctl++; IEEE80211_NODE_STAT(ni, rx_ctrl); if (ic->ic_opmode == IEEE80211_M_HOSTAP) { switch (subtype) { case IEEE80211_FC0_SUBTYPE_PS_POLL: ieee80211_recv_pspoll(ic, ni, m); break; case IEEE80211_FC0_SUBTYPE_BAR: ieee80211_recv_bar(ni, m); break; } } goto out; default: IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, wh, NULL, "bad frame type 0x%x", type); /* should not come here */ break; } err: ifp->if_ierrors++; out: if (m != NULL) { if (bpf_peers_present(ic->ic_rawbpf) && need_tap) bpf_mtap(ic->ic_rawbpf, m); m_freem(m); } return type; #undef SEQ_LEQ } /* * This function reassemble fragments. */ static struct mbuf * ieee80211_defrag(struct ieee80211com *ic, struct ieee80211_node *ni, struct mbuf *m, int hdrspace) { struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *); struct ieee80211_frame *lwh; uint16_t rxseq; uint8_t fragno; uint8_t more_frag = wh->i_fc[1] & IEEE80211_FC1_MORE_FRAG; struct mbuf *mfrag; KASSERT(!IEEE80211_IS_MULTICAST(wh->i_addr1), ("multicast fragm?")); rxseq = le16toh(*(uint16_t *)wh->i_seq); fragno = rxseq & IEEE80211_SEQ_FRAG_MASK; /* Quick way out, if there's nothing to defragment */ if (!more_frag && fragno == 0 && ni->ni_rxfrag[0] == NULL) return m; /* * Remove frag to insure it doesn't get reaped by timer. */ if (ni->ni_table == NULL) { /* * Should never happen. If the node is orphaned (not in * the table) then input packets should not reach here. * Otherwise, a concurrent request that yanks the table * should be blocked by other interlocking and/or by first * shutting the driver down. Regardless, be defensive * here and just bail */ /* XXX need msg+stat */ m_freem(m); return NULL; } IEEE80211_NODE_LOCK(ni->ni_table); mfrag = ni->ni_rxfrag[0]; ni->ni_rxfrag[0] = NULL; IEEE80211_NODE_UNLOCK(ni->ni_table); /* * Validate new fragment is in order and * related to the previous ones. */ if (mfrag != NULL) { uint16_t last_rxseq; lwh = mtod(mfrag, struct ieee80211_frame *); last_rxseq = le16toh(*(uint16_t *)lwh->i_seq); /* NB: check seq # and frag together */ if (rxseq != last_rxseq+1 || !IEEE80211_ADDR_EQ(wh->i_addr1, lwh->i_addr1) || !IEEE80211_ADDR_EQ(wh->i_addr2, lwh->i_addr2)) { /* * Unrelated fragment or no space for it, * clear current fragments. */ m_freem(mfrag); mfrag = NULL; } } if (mfrag == NULL) { if (fragno != 0) { /* !first fragment, discard */ ic->ic_stats.is_rx_defrag++; IEEE80211_NODE_STAT(ni, rx_defrag); m_freem(m); return NULL; } mfrag = m; } else { /* concatenate */ m_adj(m, hdrspace); /* strip header */ m_cat(mfrag, m); /* NB: m_cat doesn't update the packet header */ mfrag->m_pkthdr.len += m->m_pkthdr.len; /* track last seqnum and fragno */ lwh = mtod(mfrag, struct ieee80211_frame *); *(uint16_t *) lwh->i_seq = *(uint16_t *) wh->i_seq; } if (more_frag) { /* more to come, save */ ni->ni_rxfragstamp = ticks; ni->ni_rxfrag[0] = mfrag; mfrag = NULL; } return mfrag; } void ieee80211_deliver_data(struct ieee80211com *ic, struct ieee80211_node *ni, struct mbuf *m) { struct ether_header *eh = mtod(m, struct ether_header *); struct ifnet *ifp = ic->ic_ifp; /* * Do accounting. */ ifp->if_ipackets++; IEEE80211_NODE_STAT(ni, rx_data); IEEE80211_NODE_STAT_ADD(ni, rx_bytes, m->m_pkthdr.len); if (ETHER_IS_MULTICAST(eh->ether_dhost)) { m->m_flags |= M_MCAST; /* XXX M_BCAST? */ IEEE80211_NODE_STAT(ni, rx_mcast); } else IEEE80211_NODE_STAT(ni, rx_ucast); /* clear driver/net80211 flags before passing up */ m->m_flags &= ~M_80211_RX; /* perform as a bridge within the AP */ if (ic->ic_opmode == IEEE80211_M_HOSTAP && (ic->ic_flags & IEEE80211_F_NOBRIDGE) == 0) { struct mbuf *m1 = NULL; if (m->m_flags & M_MCAST) { m1 = m_dup(m, M_DONTWAIT); if (m1 == NULL) ifp->if_oerrors++; else m1->m_flags |= M_MCAST; } else { /* * Check if the destination is known; if so * and the port is authorized dispatch directly. */ struct ieee80211_node *sta = ieee80211_find_node(&ic->ic_sta, eh->ether_dhost); if (sta != NULL) { if (ieee80211_node_is_authorized(sta)) { /* * Beware of sending to ourself; this * needs to happen via the normal * input path. */ if (sta != ic->ic_bss) { m1 = m; m = NULL; } } else { ic->ic_stats.is_rx_unauth++; IEEE80211_NODE_STAT(sta, rx_unauth); } ieee80211_free_node(sta); } } if (m1 != NULL) { int error; /* XXX does not work well with WME */ IFQ_HANDOFF(ifp, m1, error); } } if (m != NULL) { m->m_pkthdr.rcvif = ifp; if (ni->ni_vlan != 0) { /* attach vlan tag */ m->m_pkthdr.ether_vtag = ni->ni_vlan; m->m_flags |= M_VLANTAG; } (*ifp->if_input)(ifp, m); } } static struct mbuf * ieee80211_decap(struct ieee80211com *ic, struct mbuf *m, int hdrlen) { struct ieee80211_qosframe_addr4 wh; /* Max size address frames */ struct ether_header *eh; struct llc *llc; if (m->m_len < hdrlen + sizeof(*llc) && (m = m_pullup(m, hdrlen + sizeof(*llc))) == NULL) { /* XXX stat, msg */ return NULL; } memcpy(&wh, mtod(m, caddr_t), hdrlen); llc = (struct llc *)(mtod(m, caddr_t) + hdrlen); 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, hdrlen + sizeof(struct llc) - sizeof(*eh)); llc = NULL; } else { m_adj(m, hdrlen - 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: IEEE80211_ADDR_COPY(eh->ether_dhost, wh.i_addr3); IEEE80211_ADDR_COPY(eh->ether_shost, wh.i_addr4); break; } #ifdef ALIGNED_POINTER if (!ALIGNED_POINTER(mtod(m, caddr_t) + sizeof(*eh), uint32_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; } M_MOVE_PKTHDR(n, m); 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; } /* * Decap a frame encapsulated in a fast-frame/A-MSDU. */ struct mbuf * ieee80211_decap1(struct mbuf *m, int *framelen) { #define FF_LLC_SIZE (sizeof(struct ether_header) + sizeof(struct llc)) struct ether_header *eh; struct llc *llc; /* * The frame has an 802.3 header followed by an 802.2 * LLC header. The encapsulated frame length is in the * first header type field; save that and overwrite it * with the true type field found in the second. Then * copy the 802.3 header up to where it belongs and * adjust the mbuf contents to remove the void. */ if (m->m_len < FF_LLC_SIZE && (m = m_pullup(m, FF_LLC_SIZE)) == NULL) return NULL; eh = mtod(m, struct ether_header *); /* 802.3 header is first */ llc = (struct llc *)&eh[1]; /* 802.2 header follows */ *framelen = ntohs(eh->ether_type) /* encap'd frame size */ + sizeof(struct ether_header) - sizeof(struct llc); eh->ether_type = llc->llc_un.type_snap.ether_type; ovbcopy(eh, mtod(m, uint8_t *) + sizeof(struct llc), sizeof(struct ether_header)); m_adj(m, sizeof(struct llc)); return m; #undef FF_LLC_SIZE } /* * Decap the encapsulated frame pair and dispatch the first * for delivery. The second frame is returned for delivery * via the normal path. */ static struct mbuf * ieee80211_decap_fastframe(struct ieee80211com *ic, struct ieee80211_node *ni, struct mbuf *m) { #define MS(x,f) (((x) & f) >> f##_S) uint32_t ath; struct mbuf *n; int framelen; m_copydata(m, 0, sizeof(uint32_t), (caddr_t) &ath); if (MS(ath, ATH_FF_PROTO) != ATH_FF_PROTO_L2TUNNEL) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, "fast-frame", "unsupport tunnel protocol, header 0x%x", ath); ic->ic_stats.is_ff_badhdr++; m_freem(m); return NULL; } /* NB: skip header and alignment padding */ m_adj(m, roundup(sizeof(uint32_t) - 2, 4) + 2); ic->ic_stats.is_ff_decap++; /* * Decap the first frame, bust it apart from the * second and deliver; then decap the second frame * and return it to the caller for normal delivery. */ m = ieee80211_decap1(m, &framelen); if (m == NULL) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, "fast-frame", "%s", "first decap failed"); ic->ic_stats.is_ff_tooshort++; return NULL; } n = m_split(m, framelen, M_NOWAIT); if (n == NULL) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, "fast-frame", "%s", "unable to split encapsulated frames"); ic->ic_stats.is_ff_split++; m_freem(m); /* NB: must reclaim */ return NULL; } ieee80211_deliver_data(ic, ni, m); /* 1st of pair */ /* * Decap second frame. */ m_adj(n, roundup2(framelen, 4) - framelen); /* padding */ n = ieee80211_decap1(n, &framelen); if (n == NULL) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_ANY, ni->ni_macaddr, "fast-frame", "%s", "second decap failed"); ic->ic_stats.is_ff_tooshort++; } /* XXX verify framelen against mbuf contents */ return n; /* 2nd delivered by caller */ #undef MS } /* * Install received rate set information in the node's state block. */ int ieee80211_setup_rates(struct ieee80211_node *ni, const uint8_t *rates, const uint8_t *xrates, int flags) { struct ieee80211com *ic = ni->ni_ic; 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) { uint8_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", ether_sprintf(ni->ni_macaddr), 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(ni, rs, flags); } static void ieee80211_auth_open(struct ieee80211com *ic, struct ieee80211_frame *wh, struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) { if (ni->ni_authmode == IEEE80211_AUTH_SHARED) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "open auth", "bad sta auth mode %u", ni->ni_authmode); ic->ic_stats.is_rx_bad_auth++; /* XXX */ if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* * Clear any challenge text that may be there if * a previous shared key auth failed and then an * open auth is attempted. */ if (ni->ni_challenge != NULL) { FREE(ni->ni_challenge, M_80211_NODE); ni->ni_challenge = NULL; } /* XXX hack to workaround calling convention */ ieee80211_send_error(ic, ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, (seq + 1) | (IEEE80211_STATUS_ALG<<16)); } return; } switch (ic->ic_opmode) { case IEEE80211_M_IBSS: case IEEE80211_M_AHDEMO: case IEEE80211_M_MONITOR: case IEEE80211_M_WDS: /* should not come here */ IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "open auth", "bad operating mode %u", ic->ic_opmode); break; case IEEE80211_M_HOSTAP: if (ic->ic_state != IEEE80211_S_RUN || seq != IEEE80211_AUTH_OPEN_REQUEST) { ic->ic_stats.is_rx_bad_auth++; return; } /* always accept open authentication requests */ if (ni == ic->ic_bss) { ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); if (ni == NULL) return; } else if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) (void) ieee80211_ref_node(ni); /* * Mark the node as referenced to reflect that it's * reference count has been bumped to insure it remains * after the transaction completes. */ ni->ni_flags |= IEEE80211_NODE_AREF; IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, "[%s] station authenticated (open)\n", ether_sprintf(ni->ni_macaddr)); /* * When 802.1x is not in use mark the port * authorized at this point so traffic can flow. */ if (ni->ni_authmode != IEEE80211_AUTH_8021X) ieee80211_node_authorize(ni); break; case IEEE80211_M_STA: if (ic->ic_state != IEEE80211_S_AUTH || seq != IEEE80211_AUTH_OPEN_RESPONSE) { ic->ic_stats.is_rx_bad_auth++; return; } if (status != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, "[%s] open auth failed (reason %d)\n", ether_sprintf(ni->ni_macaddr), status); /* XXX can this happen? */ if (ni != ic->ic_bss) ni->ni_fails++; ic->ic_stats.is_rx_auth_fail++; ieee80211_new_state(ic, IEEE80211_S_SCAN, IEEE80211_SCAN_FAIL_STATUS); } else ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); break; } } /* * Send a management frame error response to the specified * station. If ni is associated with the station then use * it; otherwise allocate a temporary node suitable for * transmitting the frame and then free the reference so * it will go away as soon as the frame has been transmitted. */ static void ieee80211_send_error(struct ieee80211com *ic, struct ieee80211_node *ni, const uint8_t *mac, int subtype, int arg) { int istmp; if (ni == ic->ic_bss) { ni = ieee80211_tmp_node(ic, mac); if (ni == NULL) { /* XXX msg */ return; } istmp = 1; } else istmp = 0; IEEE80211_SEND_MGMT(ic, ni, subtype, arg); if (istmp) ieee80211_free_node(ni); } static int alloc_challenge(struct ieee80211com *ic, struct ieee80211_node *ni) { if (ni->ni_challenge == NULL) MALLOC(ni->ni_challenge, uint32_t*, IEEE80211_CHALLENGE_LEN, M_80211_NODE, M_NOWAIT); if (ni->ni_challenge == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, "[%s] shared key challenge alloc failed\n", ether_sprintf(ni->ni_macaddr)); /* XXX statistic */ } return (ni->ni_challenge != NULL); } /* XXX TODO: add statistics */ static void ieee80211_auth_shared(struct ieee80211com *ic, struct ieee80211_frame *wh, uint8_t *frm, uint8_t *efrm, struct ieee80211_node *ni, int rssi, int noise, uint32_t rstamp, uint16_t seq, uint16_t status) { uint8_t *challenge; int allocbs, estatus; /* * NB: this can happen as we allow pre-shared key * authentication to be enabled w/o wep being turned * on so that configuration of these can be done * in any order. It may be better to enforce the * ordering in which case this check would just be * for sanity/consistency. */ if ((ic->ic_flags & IEEE80211_F_PRIVACY) == 0) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "%s", " PRIVACY is disabled"); estatus = IEEE80211_STATUS_ALG; goto bad; } /* * Pre-shared key authentication is evil; accept * it only if explicitly configured (it is supported * mainly for compatibility with clients like OS X). */ if (ni->ni_authmode != IEEE80211_AUTH_AUTO && ni->ni_authmode != IEEE80211_AUTH_SHARED) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "bad sta auth mode %u", ni->ni_authmode); ic->ic_stats.is_rx_bad_auth++; /* XXX maybe a unique error? */ estatus = IEEE80211_STATUS_ALG; goto bad; } challenge = NULL; if (frm + 1 < efrm) { if ((frm[1] + 2) > (efrm - frm)) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "ie %d/%d too long", frm[0], (frm[1] + 2) - (efrm - frm)); ic->ic_stats.is_rx_bad_auth++; estatus = IEEE80211_STATUS_CHALLENGE; goto bad; } 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_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "%s", "no challenge"); ic->ic_stats.is_rx_bad_auth++; estatus = IEEE80211_STATUS_CHALLENGE; goto bad; } if (challenge[1] != IEEE80211_CHALLENGE_LEN) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "bad challenge len %d", challenge[1]); ic->ic_stats.is_rx_bad_auth++; estatus = IEEE80211_STATUS_CHALLENGE; goto bad; } default: break; } switch (ic->ic_opmode) { case IEEE80211_M_MONITOR: case IEEE80211_M_AHDEMO: case IEEE80211_M_IBSS: case IEEE80211_M_WDS: IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "bad operating mode %u", ic->ic_opmode); return; case IEEE80211_M_HOSTAP: if (ic->ic_state != IEEE80211_S_RUN) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "bad state %u", ic->ic_state); estatus = IEEE80211_STATUS_ALG; /* XXX */ goto bad; } switch (seq) { case IEEE80211_AUTH_SHARED_REQUEST: if (ni == ic->ic_bss) { ni = ieee80211_dup_bss(&ic->ic_sta, wh->i_addr2); if (ni == NULL) { /* NB: no way to return an error */ return; } allocbs = 1; } else { if ((ni->ni_flags & IEEE80211_NODE_AREF) == 0) (void) ieee80211_ref_node(ni); allocbs = 0; } /* * Mark the node as referenced to reflect that it's * reference count has been bumped to insure it remains * after the transaction completes. */ ni->ni_flags |= IEEE80211_NODE_AREF; ni->ni_rssi = rssi; ni->ni_noise = noise; ni->ni_rstamp = rstamp; if (!alloc_challenge(ic, ni)) { /* NB: don't return error so they rexmit */ return; } get_random_bytes(ni->ni_challenge, IEEE80211_CHALLENGE_LEN); IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, "[%s] shared key %sauth request\n", ether_sprintf(ni->ni_macaddr), allocbs ? "" : "re"); break; case IEEE80211_AUTH_SHARED_RESPONSE: if (ni == ic->ic_bss) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key response", "%s", "unknown station"); /* NB: don't send a response */ return; } if (ni->ni_challenge == NULL) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key response", "%s", "no challenge recorded"); ic->ic_stats.is_rx_bad_auth++; estatus = IEEE80211_STATUS_CHALLENGE; goto bad; } if (memcmp(ni->ni_challenge, &challenge[2], challenge[1]) != 0) { IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key response", "%s", "challenge mismatch"); ic->ic_stats.is_rx_auth_fail++; estatus = IEEE80211_STATUS_CHALLENGE; goto bad; } IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, "[%s] station authenticated (shared key)\n", ether_sprintf(ni->ni_macaddr)); ieee80211_node_authorize(ni); break; default: IEEE80211_DISCARD_MAC(ic, IEEE80211_MSG_AUTH, ni->ni_macaddr, "shared key auth", "bad seq %d", seq); ic->ic_stats.is_rx_bad_auth++; estatus = IEEE80211_STATUS_SEQUENCE; goto bad; } 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_80211_NODE); ni->ni_challenge = NULL; } if (status != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_AUTH, "[%s] shared key auth failed (reason %d)\n", ether_sprintf(ieee80211_getbssid(ic, wh)), status); /* XXX can this happen? */ if (ni != ic->ic_bss) ni->ni_fails++; ic->ic_stats.is_rx_auth_fail++; return; } ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); break; case IEEE80211_AUTH_SHARED_CHALLENGE: if (!alloc_challenge(ic, ni)) return; /* XXX could optimize by passing recvd challenge */ memcpy(ni->ni_challenge, &challenge[2], challenge[1]); IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, seq + 1); break; default: IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH, wh, "shared key auth", "bad seq %d", seq); ic->ic_stats.is_rx_bad_auth++; return; } break; } return; bad: /* * Send an error response; but only when operating as an AP. */ if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* XXX hack to workaround calling convention */ ieee80211_send_error(ic, ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_AUTH, (seq + 1) | (estatus<<16)); } else if (ic->ic_opmode == IEEE80211_M_STA) { /* * Kick the state machine. This short-circuits * using the mgt frame timeout to trigger the * state transition. */ if (ic->ic_state == IEEE80211_S_AUTH) ieee80211_new_state(ic, IEEE80211_S_SCAN, IEEE80211_SCAN_FAIL_STATUS); } } /* * Convert a WPA cipher selector OUI to an internal * cipher algorithm. Where appropriate we also * record any key length. */ static int wpa_cipher(uint8_t *sel, uint8_t *keylen) { #define WPA_SEL(x) (((x)<<24)|WPA_OUI) uint32_t w = LE_READ_4(sel); switch (w) { case WPA_SEL(WPA_CSE_NULL): return IEEE80211_CIPHER_NONE; case WPA_SEL(WPA_CSE_WEP40): if (keylen) *keylen = 40 / NBBY; return IEEE80211_CIPHER_WEP; case WPA_SEL(WPA_CSE_WEP104): if (keylen) *keylen = 104 / NBBY; return IEEE80211_CIPHER_WEP; case WPA_SEL(WPA_CSE_TKIP): return IEEE80211_CIPHER_TKIP; case WPA_SEL(WPA_CSE_CCMP): return IEEE80211_CIPHER_AES_CCM; } return 32; /* NB: so 1<< is discarded */ #undef WPA_SEL } /* * Convert a WPA key management/authentication algorithm * to an internal code. */ static int wpa_keymgmt(uint8_t *sel) { #define WPA_SEL(x) (((x)<<24)|WPA_OUI) uint32_t w = LE_READ_4(sel); switch (w) { case WPA_SEL(WPA_ASE_8021X_UNSPEC): return WPA_ASE_8021X_UNSPEC; case WPA_SEL(WPA_ASE_8021X_PSK): return WPA_ASE_8021X_PSK; case WPA_SEL(WPA_ASE_NONE): return WPA_ASE_NONE; } return 0; /* NB: so is discarded */ #undef WPA_SEL } /* * Parse a WPA information element to collect parameters * and validate the parameters against what has been * configured for the system. */ static int ieee80211_parse_wpa(struct ieee80211com *ic, uint8_t *frm, struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) { uint8_t len = frm[1]; uint32_t w; int n; /* * Check the length once for fixed parts: OUI, type, * version, mcast cipher, and 2 selector counts. * Other, variable-length data, must be checked separately. */ if ((ic->ic_flags & IEEE80211_F_WPA1) == 0) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "not WPA, flags 0x%x", ic->ic_flags); return IEEE80211_REASON_IE_INVALID; } if (len < 14) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "too short, len %u", len); return IEEE80211_REASON_IE_INVALID; } frm += 6, len -= 4; /* NB: len is payload only */ /* NB: iswapoui already validated the OUI and type */ w = LE_READ_2(frm); if (w != WPA_VERSION) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "bad version %u", w); return IEEE80211_REASON_IE_INVALID; } frm += 2, len -= 2; /* multicast/group cipher */ w = wpa_cipher(frm, &rsn->rsn_mcastkeylen); if (w != rsn->rsn_mcastcipher) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "mcast cipher mismatch; got %u, expected %u", w, rsn->rsn_mcastcipher); return IEEE80211_REASON_IE_INVALID; } frm += 4, len -= 4; /* unicast ciphers */ n = LE_READ_2(frm); frm += 2, len -= 2; if (len < n*4+2) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "ucast cipher data too short; len %u, n %u", len, n); return IEEE80211_REASON_IE_INVALID; } w = 0; for (; n > 0; n--) { w |= 1<rsn_ucastkeylen); frm += 4, len -= 4; } w &= rsn->rsn_ucastcipherset; if (w == 0) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "%s", "ucast cipher set empty"); return IEEE80211_REASON_IE_INVALID; } if (w & (1<rsn_ucastcipher = IEEE80211_CIPHER_TKIP; else rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; /* key management algorithms */ n = LE_READ_2(frm); frm += 2, len -= 2; if (len < n*4) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "key mgmt alg data too short; len %u, n %u", len, n); return IEEE80211_REASON_IE_INVALID; } w = 0; for (; n > 0; n--) { w |= wpa_keymgmt(frm); frm += 4, len -= 4; } w &= rsn->rsn_keymgmtset; if (w == 0) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "%s", "no acceptable key mgmt alg"); return IEEE80211_REASON_IE_INVALID; } if (w & WPA_ASE_8021X_UNSPEC) rsn->rsn_keymgmt = WPA_ASE_8021X_UNSPEC; else rsn->rsn_keymgmt = WPA_ASE_8021X_PSK; if (len > 2) /* optional capabilities */ rsn->rsn_caps = LE_READ_2(frm); return 0; } /* * Convert an RSN cipher selector OUI to an internal * cipher algorithm. Where appropriate we also * record any key length. */ static int rsn_cipher(uint8_t *sel, uint8_t *keylen) { #define RSN_SEL(x) (((x)<<24)|RSN_OUI) uint32_t w = LE_READ_4(sel); switch (w) { case RSN_SEL(RSN_CSE_NULL): return IEEE80211_CIPHER_NONE; case RSN_SEL(RSN_CSE_WEP40): if (keylen) *keylen = 40 / NBBY; return IEEE80211_CIPHER_WEP; case RSN_SEL(RSN_CSE_WEP104): if (keylen) *keylen = 104 / NBBY; return IEEE80211_CIPHER_WEP; case RSN_SEL(RSN_CSE_TKIP): return IEEE80211_CIPHER_TKIP; case RSN_SEL(RSN_CSE_CCMP): return IEEE80211_CIPHER_AES_CCM; case RSN_SEL(RSN_CSE_WRAP): return IEEE80211_CIPHER_AES_OCB; } return 32; /* NB: so 1<< is discarded */ #undef WPA_SEL } /* * Convert an RSN key management/authentication algorithm * to an internal code. */ static int rsn_keymgmt(uint8_t *sel) { #define RSN_SEL(x) (((x)<<24)|RSN_OUI) uint32_t w = LE_READ_4(sel); switch (w) { case RSN_SEL(RSN_ASE_8021X_UNSPEC): return RSN_ASE_8021X_UNSPEC; case RSN_SEL(RSN_ASE_8021X_PSK): return RSN_ASE_8021X_PSK; case RSN_SEL(RSN_ASE_NONE): return RSN_ASE_NONE; } return 0; /* NB: so is discarded */ #undef RSN_SEL } /* * Parse a WPA/RSN information element to collect parameters * and validate the parameters against what has been * configured for the system. */ static int ieee80211_parse_rsn(struct ieee80211com *ic, uint8_t *frm, struct ieee80211_rsnparms *rsn, const struct ieee80211_frame *wh) { uint8_t len = frm[1]; uint32_t w; int n; /* * Check the length once for fixed parts: * version, mcast cipher, and 2 selector counts. * Other, variable-length data, must be checked separately. */ if ((ic->ic_flags & IEEE80211_F_WPA2) == 0) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "WPA", "not RSN, flags 0x%x", ic->ic_flags); return IEEE80211_REASON_IE_INVALID; } if (len < 10) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "RSN", "too short, len %u", len); return IEEE80211_REASON_IE_INVALID; } frm += 2; w = LE_READ_2(frm); if (w != RSN_VERSION) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "RSN", "bad version %u", w); return IEEE80211_REASON_IE_INVALID; } frm += 2, len -= 2; /* multicast/group cipher */ w = rsn_cipher(frm, &rsn->rsn_mcastkeylen); if (w != rsn->rsn_mcastcipher) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "RSN", "mcast cipher mismatch; got %u, expected %u", w, rsn->rsn_mcastcipher); return IEEE80211_REASON_IE_INVALID; } frm += 4, len -= 4; /* unicast ciphers */ n = LE_READ_2(frm); frm += 2, len -= 2; if (len < n*4+2) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "RSN", "ucast cipher data too short; len %u, n %u", len, n); return IEEE80211_REASON_IE_INVALID; } w = 0; for (; n > 0; n--) { w |= 1<rsn_ucastkeylen); frm += 4, len -= 4; } w &= rsn->rsn_ucastcipherset; if (w == 0) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "RSN", "%s", "ucast cipher set empty"); return IEEE80211_REASON_IE_INVALID; } if (w & (1<rsn_ucastcipher = IEEE80211_CIPHER_TKIP; else rsn->rsn_ucastcipher = IEEE80211_CIPHER_AES_CCM; /* key management algorithms */ n = LE_READ_2(frm); frm += 2, len -= 2; if (len < n*4) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "RSN", "key mgmt alg data too short; len %u, n %u", len, n); return IEEE80211_REASON_IE_INVALID; } w = 0; for (; n > 0; n--) { w |= rsn_keymgmt(frm); frm += 4, len -= 4; } w &= rsn->rsn_keymgmtset; if (w == 0) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WPA, wh, "RSN", "%s", "no acceptable key mgmt alg"); return IEEE80211_REASON_IE_INVALID; } if (w & RSN_ASE_8021X_UNSPEC) rsn->rsn_keymgmt = RSN_ASE_8021X_UNSPEC; else rsn->rsn_keymgmt = RSN_ASE_8021X_PSK; /* optional RSN capabilities */ if (len > 2) rsn->rsn_caps = LE_READ_2(frm); /* XXXPMKID */ return 0; } static int ieee80211_parse_wmeparams(struct ieee80211com *ic, uint8_t *frm, const struct ieee80211_frame *wh) { #define MS(_v, _f) (((_v) & _f) >> _f##_S) struct ieee80211_wme_state *wme = &ic->ic_wme; u_int len = frm[1], qosinfo; int i; if (len < sizeof(struct ieee80211_wme_param)-2) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_WME, wh, "WME", "too short, len %u", len); return -1; } qosinfo = frm[__offsetof(struct ieee80211_wme_param, param_qosInfo)]; qosinfo &= WME_QOSINFO_COUNT; /* XXX do proper check for wraparound */ if (qosinfo == wme->wme_wmeChanParams.cap_info) return 0; frm += __offsetof(struct ieee80211_wme_param, params_acParams); for (i = 0; i < WME_NUM_AC; i++) { struct wmeParams *wmep = &wme->wme_wmeChanParams.cap_wmeParams[i]; /* NB: ACI not used */ wmep->wmep_acm = MS(frm[0], WME_PARAM_ACM); wmep->wmep_aifsn = MS(frm[0], WME_PARAM_AIFSN); wmep->wmep_logcwmin = MS(frm[1], WME_PARAM_LOGCWMIN); wmep->wmep_logcwmax = MS(frm[1], WME_PARAM_LOGCWMAX); wmep->wmep_txopLimit = LE_READ_2(frm+2); frm += 4; } wme->wme_wmeChanParams.cap_info = qosinfo; return 1; #undef MS } static int ieee80211_parse_athparams(struct ieee80211_node *ni, uint8_t *frm, const struct ieee80211_frame *wh) { struct ieee80211com *ic = ni->ni_ic; const struct ieee80211_ath_ie *ath; u_int len = frm[1]; int capschanged; uint16_t defkeyix; if (len < sizeof(struct ieee80211_ath_ie)-2) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_SUPERG, wh, "Atheros", "too short, len %u", len); return -1; } ath = (const struct ieee80211_ath_ie *)frm; capschanged = (ni->ni_ath_flags != ath->ath_capability); defkeyix = LE_READ_2(ath->ath_defkeyix); if (capschanged || defkeyix != ni->ni_ath_defkeyix) { ni->ni_ath_flags = ath->ath_capability; ni->ni_ath_defkeyix = defkeyix; IEEE80211_DPRINTF(ic, IEEE80211_MSG_SUPERG, "[%s] ath ie change: new caps 0x%x defkeyix 0x%x\n", ether_sprintf(ni->ni_macaddr), ni->ni_ath_flags, ni->ni_ath_defkeyix); } if (IEEE80211_ATH_CAP(ic, ni, ATHEROS_CAP_TURBO_PRIME)) { uint16_t curflags, newflags; /* * Check for turbo mode switch. Calculate flags * for the new mode and effect the switch. */ newflags = curflags = ic->ic_bsschan->ic_flags; /* NB: BOOST is not in ic_flags, so get it from the ie */ if (ath->ath_capability & ATHEROS_CAP_BOOST) newflags |= IEEE80211_CHAN_TURBO; else newflags &= ~IEEE80211_CHAN_TURBO; if (newflags != curflags) ieee80211_dturbo_switch(ic, newflags); } return capschanged; } void ieee80211_parse_ath(struct ieee80211_node *ni, uint8_t *ie) { const struct ieee80211_ath_ie *ath = (const struct ieee80211_ath_ie *) ie; ni->ni_ath_flags = ath->ath_capability; ni->ni_ath_defkeyix = LE_READ_2(&ath->ath_defkeyix); } /* XXX find a better place for definition */ struct l2_update_frame { struct ether_header eh; uint8_t dsap; uint8_t ssap; uint8_t control; uint8_t xid[3]; } __packed; /* * Deliver a TGf L2UF frame on behalf of a station. * This primes any bridge when the station is roaming * between ap's on the same wired network. */ static void ieee80211_deliver_l2uf(struct ieee80211_node *ni) { struct ieee80211com *ic = ni->ni_ic; struct ifnet *ifp = ic->ic_ifp; struct mbuf *m; struct l2_update_frame *l2uf; struct ether_header *eh; m = m_gethdr(M_NOWAIT, MT_DATA); if (m == NULL) { IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC, ni, "%s", "no mbuf for l2uf frame"); ic->ic_stats.is_rx_nobuf++; /* XXX not right */ return; } l2uf = mtod(m, struct l2_update_frame *); eh = &l2uf->eh; /* dst: Broadcast address */ IEEE80211_ADDR_COPY(eh->ether_dhost, ifp->if_broadcastaddr); /* src: associated STA */ IEEE80211_ADDR_COPY(eh->ether_shost, ni->ni_macaddr); eh->ether_type = htons(sizeof(*l2uf) - sizeof(*eh)); l2uf->dsap = 0; l2uf->ssap = 0; l2uf->control = 0xf5; l2uf->xid[0] = 0x81; l2uf->xid[1] = 0x80; l2uf->xid[2] = 0x00; m->m_pkthdr.len = m->m_len = sizeof(*l2uf); ieee80211_deliver_data(ic, ni, m); } static __inline int contbgscan(struct ieee80211com *ic) { return ((ic->ic_flags_ext & IEEE80211_FEXT_BGSCAN) && time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle)); } static __inline int startbgscan(struct ieee80211com *ic) { return ((ic->ic_flags & IEEE80211_F_BGSCAN) && !IEEE80211_IS_CHAN_DTURBO(ic->ic_curchan) && time_after(ticks, ic->ic_lastscan + ic->ic_bgscanintvl) && time_after(ticks, ic->ic_lastdata + ic->ic_bgscanidle)); } static void ratesetmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, int reassoc, int resp, const char *tag, int rate) { struct ieee80211com *ic = ni->ni_ic; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, "[%s] deny %s request, %s rate set mismatch, rate 0x%x\n", ether_sprintf(wh->i_addr2), reassoc ? "reassoc" : "assoc", tag, rate); IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_BASIC_RATE); ieee80211_node_leave(ic, ni); ic->ic_stats.is_rx_assoc_norate++; } static void capinfomismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, int reassoc, int resp, const char *tag, int capinfo) { struct ieee80211com *ic = ni->ni_ic; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, "[%s] deny %s request, %s mismatch 0x%x\n", ether_sprintf(wh->i_addr2), reassoc ? "reassoc" : "assoc", tag, capinfo); IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_CAPINFO); ieee80211_node_leave(ic, ni); ic->ic_stats.is_rx_assoc_capmismatch++; } static void htcapmismatch(struct ieee80211_node *ni, const struct ieee80211_frame *wh, int reassoc, int resp) { struct ieee80211com *ic = ni->ni_ic; IEEE80211_NOTE_MAC(ic, IEEE80211_MSG_ANY, wh->i_addr2, "deny %s request, %s missing HT ie", reassoc ? "reassoc" : "assoc"); /* XXX no better code */ IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_OTHER); ieee80211_node_leave(ic, ni); } void ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, int subtype, int rssi, int noise, uint32_t rstamp) { #define ISPROBE(_st) ((_st) == IEEE80211_FC0_SUBTYPE_PROBE_RESP) #define ISREASSOC(_st) ((_st) == IEEE80211_FC0_SUBTYPE_REASSOC_RESP) struct ieee80211_frame *wh; uint8_t *frm, *efrm, *sfrm; uint8_t *ssid, *rates, *xrates, *wpa, *rsn, *wme, *ath, *htcap, *htinfo; int reassoc, resp, allocbs; uint8_t rate; wh = mtod(m0, struct ieee80211_frame *); frm = (uint8_t *)&wh[1]; efrm = mtod(m0, uint8_t *) + m0->m_len; switch (subtype) { case IEEE80211_FC0_SUBTYPE_PROBE_RESP: case IEEE80211_FC0_SUBTYPE_BEACON: { struct ieee80211_scanparams scan; /* * We process beacon/probe response frames: * o when scanning, or * o station mode when associated (to collect state * updates such as 802.11g slot time), or * o adhoc mode (to discover neighbors) * Frames otherwise received are discarded. */ if (!((ic->ic_flags & IEEE80211_F_SCAN) || (ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd) || ic->ic_opmode == IEEE80211_M_IBSS)) { ic->ic_stats.is_rx_mgtdiscard++; return; } /* * 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 * [tlv] WME * [tlv] WPA or RSN * [tlv] HT capabilities * [tlv] HT information * [tlv] Atheros capabilities */ IEEE80211_VERIFY_LENGTH(efrm - frm, 12, return); memset(&scan, 0, sizeof(scan)); scan.tstamp = frm; frm += 8; scan.bintval = le16toh(*(uint16_t *)frm); frm += 2; scan.capinfo = le16toh(*(uint16_t *)frm); frm += 2; scan.bchan = IEEE80211_CHAN2IEEE(ic->ic_curchan); scan.curchan = ic->ic_curchan; scan.ies = frm; scan.ies_len = efrm - frm; while (efrm - frm > 1) { IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); switch (*frm) { case IEEE80211_ELEMID_SSID: scan.ssid = frm; break; case IEEE80211_ELEMID_RATES: scan.rates = frm; break; case IEEE80211_ELEMID_COUNTRY: scan.country = frm; break; case IEEE80211_ELEMID_FHPARMS: if (ic->ic_phytype == IEEE80211_T_FH) { scan.fhdwell = LE_READ_2(&frm[2]); scan.bchan = IEEE80211_FH_CHAN(frm[4], frm[5]); scan.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) scan.bchan = frm[2]; break; case IEEE80211_ELEMID_TIM: /* XXX ATIM? */ scan.tim = frm; scan.timoff = frm - mtod(m0, uint8_t *); break; case IEEE80211_ELEMID_IBSSPARMS: break; case IEEE80211_ELEMID_XRATES: scan.xrates = frm; break; case IEEE80211_ELEMID_ERP: if (frm[1] != 1) { IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID, wh, "ERP", "bad len %u", frm[1]); ic->ic_stats.is_rx_elem_toobig++; break; } scan.erp = frm[2]; break; case IEEE80211_ELEMID_HTCAP: scan.htcap = frm; break; case IEEE80211_ELEMID_RSN: scan.rsn = frm; break; case IEEE80211_ELEMID_HTINFO: scan.htinfo = frm; break; case IEEE80211_ELEMID_VENDOR: if (iswpaoui(frm)) scan.wpa = frm; else if (iswmeparam(frm) || iswmeinfo(frm)) scan.wme = frm; else if (isatherosoui(frm)) scan.ath = frm; else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { /* * Accept pre-draft HT ie's if the * standard ones have not been seen. */ if (ishtcapoui(frm)) { if (scan.htcap == NULL) scan.htcap = frm; } else if (ishtinfooui(frm)) { if (scan.htinfo == NULL) scan.htcap = frm; } } break; default: IEEE80211_DISCARD_IE(ic, IEEE80211_MSG_ELEMID, wh, "unhandled", "id %u, len %u", *frm, frm[1]); ic->ic_stats.is_rx_elem_unknown++; break; } frm += frm[1] + 2; } IEEE80211_VERIFY_ELEMENT(scan.rates, IEEE80211_RATE_MAXSIZE); if (scan.xrates != NULL) IEEE80211_VERIFY_ELEMENT(scan.xrates, IEEE80211_RATE_MAXSIZE - scan.rates[1]); IEEE80211_VERIFY_ELEMENT(scan.ssid, IEEE80211_NWID_LEN); #if IEEE80211_CHAN_MAX < 255 if (scan.chan > IEEE80211_CHAN_MAX) { IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID, wh, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], "invalid channel %u", scan.chan); ic->ic_stats.is_rx_badchan++; return; } #endif if (IEEE80211_CHAN2IEEE(scan.curchan) != scan.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_DISCARD(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, wh, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], "for off-channel %u", IEEE80211_CHAN2IEEE(scan.curchan)); ic->ic_stats.is_rx_chanmismatch++; return; } if (!(IEEE80211_BINTVAL_MIN <= scan.bintval && scan.bintval <= IEEE80211_BINTVAL_MAX)) { IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID | IEEE80211_MSG_INPUT, wh, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], "bogus beacon interval", scan.bintval); ic->ic_stats.is_rx_badbintval++; return; } /* * Process HT ie's. This is complicated by our * accepting both the standard ie's and the pre-draft * vendor OUI ie's that some vendors still use/require. */ if (scan.htcap != NULL) { IEEE80211_VERIFY_LENGTH(scan.htcap[1], scan.htcap[0] == IEEE80211_ELEMID_VENDOR ? 4 + sizeof(struct ieee80211_ie_htcap)-2 : sizeof(struct ieee80211_ie_htcap)-2, scan.htcap = NULL); } if (scan.htinfo != NULL) { IEEE80211_VERIFY_LENGTH(scan.htinfo[1], scan.htinfo[0] == IEEE80211_ELEMID_VENDOR ? 4 + sizeof(struct ieee80211_ie_htinfo)-2 : sizeof(struct ieee80211_ie_htinfo)-2, scan.htinfo = NULL); } /* * Count frame now that we know it's to be processed. */ if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) { ic->ic_stats.is_rx_beacon++; /* XXX remove */ IEEE80211_NODE_STAT(ni, rx_beacons); } else IEEE80211_NODE_STAT(ni, rx_proberesp); /* * When operating in station mode, check for state updates. * Be careful to ignore beacons received while doing a * background scan. We consider only 11g/WMM stuff right now. */ if (ic->ic_opmode == IEEE80211_M_STA && ni->ni_associd != 0 && ((ic->ic_flags & IEEE80211_F_SCAN) == 0 || IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_bssid))) { /* record tsf of last beacon */ memcpy(ni->ni_tstamp.data, scan.tstamp, sizeof(ni->ni_tstamp)); /* count beacon frame for s/w bmiss handling */ ic->ic_swbmiss_count++; ic->ic_bmiss_count = 0; if (ni->ni_erp != scan.erp) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] erp change: was 0x%x, now 0x%x\n", ether_sprintf(wh->i_addr2), ni->ni_erp, scan.erp); if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) ic->ic_flags |= IEEE80211_F_USEPROT; else ic->ic_flags &= ~IEEE80211_F_USEPROT; ni->ni_erp = scan.erp; /* XXX statistic */ } if ((ni->ni_capinfo ^ scan.capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] capabilities change: before 0x%x," " now 0x%x\n", ether_sprintf(wh->i_addr2), ni->ni_capinfo, scan.capinfo); /* * NB: we assume short preamble doesn't * change dynamically */ ieee80211_set_shortslottime(ic, IEEE80211_IS_CHAN_A(ic->ic_bsschan) || (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); ni->ni_capinfo = (ni->ni_capinfo &~ IEEE80211_CAPINFO_SHORT_SLOTTIME) | (scan.capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME); /* XXX statistic */ } if (scan.wme != NULL && (ni->ni_flags & IEEE80211_NODE_QOS) && ieee80211_parse_wmeparams(ic, scan.wme, wh) > 0) ieee80211_wme_updateparams(ic); if (scan.ath != NULL) ieee80211_parse_athparams(ni, scan.ath, wh); if (scan.htcap != NULL) ieee80211_parse_htcap(ni, scan.htcap); if (scan.htinfo != NULL) { ieee80211_parse_htinfo(ni, scan.htinfo); if (ni->ni_chan != ic->ic_bsschan) { /* * Channel has been adjusted based on * negotiated HT parameters; force the * channel state to follow. */ ieee80211_setbsschan(ic, ni->ni_chan); } } if (scan.tim != NULL) { struct ieee80211_tim_ie *tim = (struct ieee80211_tim_ie *) scan.tim; #if 0 int aid = IEEE80211_AID(ni->ni_associd); int ix = aid / NBBY; int min = tim->tim_bitctl &~ 1; int max = tim->tim_len + min - 4; if ((tim->tim_bitctl&1) || (min <= ix && ix <= max && isset(tim->tim_bitmap - min, aid))) { /* * XXX Do not let bg scan kick off * we are expecting data. */ ic->ic_lastdata = ticks; ieee80211_sta_pwrsave(ic, 0); } #endif ni->ni_dtim_count = tim->tim_count; ni->ni_dtim_period = tim->tim_period; } /* * If scanning, pass the info to the scan module. * Otherwise, check if it's the right time to do * a background scan. Background scanning must * be enabled and we must not be operating in the * turbo phase of dynamic turbo mode. Then, * it's been a while since the last background * scan and if no data frames have come through * recently, kick off a scan. Note that this * is the mechanism by which a background scan * is started _and_ continued each time we * return on-channel to receive a beacon from * our ap. */ if (ic->ic_flags & IEEE80211_F_SCAN) { ieee80211_add_scan(ic, &scan, wh, subtype, rssi, noise, rstamp); } else if (contbgscan(ic)) { ieee80211_bg_scan(ic); } else if (startbgscan(ic)) { #if 0 /* wakeup if we are sleeing */ ieee80211_set_pwrsave(ic, 0); #endif ieee80211_bg_scan(ic); } return; } /* * If scanning, just pass information to the scan module. */ if (ic->ic_flags & IEEE80211_F_SCAN) { if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) { /* * Actively scanning a channel marked passive; * send a probe request now that we know there * is 802.11 traffic present. * * XXX check if the beacon we recv'd gives * us what we need and suppress the probe req */ ieee80211_probe_curchan(ic, 1); ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN; } ieee80211_add_scan(ic, &scan, wh, subtype, rssi, noise, rstamp); return; } if (scan.capinfo & IEEE80211_CAPINFO_IBSS) { if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { /* * Create a new entry in the neighbor table. */ ni = ieee80211_add_neighbor(ic, wh, &scan); } else if (ni->ni_capinfo == 0) { /* * Update faked node created on transmit. * Note this also updates the tsf. */ ieee80211_init_neighbor(ni, wh, &scan); } else { /* * Record tsf for potential resync. */ memcpy(ni->ni_tstamp.data, scan.tstamp, sizeof(ni->ni_tstamp)); } if (ni != NULL) { ni->ni_rssi = rssi; ni->ni_noise = noise; ni->ni_rstamp = rstamp; } } break; } case IEEE80211_FC0_SUBTYPE_PROBE_REQ: if (ic->ic_opmode == IEEE80211_M_STA || ic->ic_state != IEEE80211_S_RUN) { ic->ic_stats.is_rx_mgtdiscard++; return; } if (IEEE80211_IS_MULTICAST(wh->i_addr2)) { /* frame must be directed */ ic->ic_stats.is_rx_mgtdiscard++; /* XXX stat */ return; } /* * prreq frame format * [tlv] ssid * [tlv] supported rates * [tlv] extended supported rates */ ssid = rates = xrates = NULL; while (efrm - frm > 1) { IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); 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); if (xrates != NULL) IEEE80211_VERIFY_ELEMENT(xrates, IEEE80211_RATE_MAXSIZE - rates[1]); IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); if ((ic->ic_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) { IEEE80211_DISCARD(ic, IEEE80211_MSG_INPUT, wh, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], "%s", "no ssid with ssid suppression enabled"); ic->ic_stats.is_rx_ssidmismatch++; /*XXX*/ return; } allocbs = 0; if (ni == ic->ic_bss) { if (ic->ic_opmode != IEEE80211_M_IBSS) { ni = ieee80211_tmp_node(ic, wh->i_addr2); allocbs = 1; } else if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) { /* * XXX Cannot tell if the sender is operating * in ibss mode. But we need a new node to * send the response so blindly add them to the * neighbor table. */ ni = ieee80211_fakeup_adhoc_node(&ic->ic_sta, wh->i_addr2); } if (ni == NULL) return; } IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] recv probe req\n", ether_sprintf(wh->i_addr2)); ni->ni_rssi = rssi; ni->ni_rstamp = rstamp; rate = ieee80211_setup_rates(ni, rates, xrates, IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (rate & IEEE80211_RATE_BASIC) { IEEE80211_DISCARD(ic, IEEE80211_MSG_XRATE, wh, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], "%s", "recv'd rate set invalid"); } else { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); } if (allocbs) { /* * Temporary node created just to send a * response, reclaim immediately. */ ieee80211_free_node(ni); } break; case IEEE80211_FC0_SUBTYPE_AUTH: { uint16_t algo, seq, status; /* * auth frame format * [2] algorithm * [2] sequence * [2] status * [tlv*] challenge */ IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); algo = le16toh(*(uint16_t *)frm); seq = le16toh(*(uint16_t *)(frm + 2)); status = le16toh(*(uint16_t *)(frm + 4)); IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, "[%s] recv auth frame with algorithm %d seq %d\n", ether_sprintf(wh->i_addr2), algo, seq); /* * Consult the ACL policy module if setup. */ if (ic->ic_acl != NULL && !ic->ic_acl->iac_check(ic, wh->i_addr2)) { IEEE80211_DISCARD(ic, IEEE80211_MSG_ACL, wh, "auth", "%s", "disallowed by ACL"); ic->ic_stats.is_rx_acl++; if (ic->ic_opmode == IEEE80211_M_HOSTAP) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, (seq+1) | (IEEE80211_STATUS_UNSPECIFIED<<16)); } return; } if (ic->ic_flags & IEEE80211_F_COUNTERM) { IEEE80211_DISCARD(ic, IEEE80211_MSG_AUTH | IEEE80211_MSG_CRYPTO, wh, "auth", "%s", "TKIP countermeasures enabled"); ic->ic_stats.is_rx_auth_countermeasures++; if (ic->ic_opmode == IEEE80211_M_HOSTAP) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, IEEE80211_REASON_MIC_FAILURE); } return; } if (algo == IEEE80211_AUTH_ALG_SHARED) ieee80211_auth_shared(ic, wh, frm + 6, efrm, ni, rssi, noise, rstamp, seq, status); else if (algo == IEEE80211_AUTH_ALG_OPEN) ieee80211_auth_open(ic, wh, ni, rssi, noise, rstamp, seq, status); else { IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, wh, "auth", "unsupported alg %d", algo); ic->ic_stats.is_rx_auth_unsupported++; if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* XXX not right */ IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, (seq+1) | (IEEE80211_STATUS_ALG<<16)); } return; } break; } case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: { uint16_t capinfo, lintval; struct ieee80211_rsnparms rsnparms; uint8_t reason; int badwparsn; if (ic->ic_opmode != IEEE80211_M_HOSTAP || ic->ic_state != IEEE80211_S_RUN) { ic->ic_stats.is_rx_mgtdiscard++; 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 * [tlv] WPA or RSN * [tlv] HT capabilities * [tlv] Atheros capabilities */ IEEE80211_VERIFY_LENGTH(efrm - frm, (reassoc ? 10 : 4), return); if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, wh, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], "%s", "wrong bssid"); ic->ic_stats.is_rx_assoc_bss++; return; } capinfo = le16toh(*(uint16_t *)frm); frm += 2; lintval = le16toh(*(uint16_t *)frm); frm += 2; if (reassoc) frm += 6; /* ignore current AP info */ ssid = rates = xrates = wpa = rsn = wme = ath = htcap = NULL; sfrm = frm; while (efrm - frm > 1) { IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); switch (*frm) { case IEEE80211_ELEMID_SSID: ssid = frm; break; case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; /* XXX verify only one of RSN and WPA ie's? */ case IEEE80211_ELEMID_RSN: rsn = frm; break; case IEEE80211_ELEMID_HTCAP: htcap = frm; break; case IEEE80211_ELEMID_VENDOR: if (iswpaoui(frm)) wpa = frm; else if (iswmeinfo(frm)) wme = frm; else if (isatherosoui(frm)) ath = frm; else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { if (ishtcapoui(frm) && htcap == NULL) htcap = frm; } break; } frm += frm[1] + 2; } IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); if (xrates != NULL) IEEE80211_VERIFY_ELEMENT(xrates, IEEE80211_RATE_MAXSIZE - rates[1]); IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN); IEEE80211_VERIFY_SSID(ic->ic_bss, ssid); if (htcap != NULL) { IEEE80211_VERIFY_LENGTH(htcap[1], htcap[0] == IEEE80211_ELEMID_VENDOR ? 4 + sizeof(struct ieee80211_ie_htcap)-2 : sizeof(struct ieee80211_ie_htcap)-2, return); /* XXX just NULL out? */ } if (ni == ic->ic_bss) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY, "[%s] deny %s request, sta not authenticated\n", ether_sprintf(wh->i_addr2), reassoc ? "reassoc" : "assoc"); ieee80211_send_error(ic, ni, wh->i_addr2, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_ASSOC_NOT_AUTHED); ic->ic_stats.is_rx_assoc_notauth++; return; } /* assert right association security credentials */ badwparsn = 0; switch (ic->ic_flags & IEEE80211_F_WPA) { case IEEE80211_F_WPA1: if (wpa == NULL) badwparsn = 1; break; case IEEE80211_F_WPA2: if (rsn == NULL) badwparsn = 1; break; case IEEE80211_F_WPA1|IEEE80211_F_WPA2: if (wpa == NULL && rsn == NULL) badwparsn = 1; break; } if (badwparsn) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, "[%s] no WPA/RSN IE in association request\n", ether_sprintf(wh->i_addr2)); IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_IE_INVALID); ieee80211_node_leave(ic, ni); ic->ic_stats.is_rx_assoc_badwpaie++; return; } if (wpa != NULL || rsn != NULL) { /* * Parse WPA/RSN information element. Note that * we initialize the param block from the node * state so that information in the IE overrides * our defaults. The resulting parameters are * installed below after the association is assured. */ rsnparms = ni->ni_rsn; if (wpa != NULL) reason = ieee80211_parse_wpa(ic, wpa, &rsnparms, wh); else reason = ieee80211_parse_rsn(ic, rsn, &rsnparms, wh); if (reason != 0) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, reason); ieee80211_node_leave(ic, ni); /* XXX distinguish WPA/RSN? */ ic->ic_stats.is_rx_assoc_badwpaie++; return; } IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_WPA, "[%s] %s ie: mc %u/%u uc %u/%u key %u caps 0x%x\n", ether_sprintf(wh->i_addr2), wpa != NULL ? "WPA" : "RSN", rsnparms.rsn_mcastcipher, rsnparms.rsn_mcastkeylen, rsnparms.rsn_ucastcipher, rsnparms.rsn_ucastkeylen, rsnparms.rsn_keymgmt, rsnparms.rsn_caps); } /* discard challenge after association */ if (ni->ni_challenge != NULL) { FREE(ni->ni_challenge, M_80211_NODE); ni->ni_challenge = NULL; } /* NB: 802.11 spec says to ignore station's privacy bit */ if ((capinfo & IEEE80211_CAPINFO_ESS) == 0) { capinfomismatch(ni, wh, reassoc, resp, "capability", capinfo); return; } /* * Disallow re-associate w/ invalid slot time setting. */ if (ni->ni_associd != 0 && IEEE80211_IS_CHAN_ANYG(ic->ic_bsschan) && ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME)) { capinfomismatch(ni, wh, reassoc, resp, "slot time", capinfo); return; } rate = ieee80211_setup_rates(ni, rates, xrates, IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (rate & IEEE80211_RATE_BASIC) { ratesetmismatch(ni, wh, reassoc, resp, "basic", rate); return; } /* * If constrained to 11g-only stations reject an * 11b-only station. We cheat a bit here by looking * at the max negotiated xmit rate and assuming anyone * with a best rate <24Mb/s is an 11b station. */ if ((ic->ic_flags & IEEE80211_F_PUREG) && rate < 48) { ratesetmismatch(ni, wh, reassoc, resp, "11g", rate); return; } /* XXX enforce PUREN */ /* 802.11n-specific rateset handling */ if (IEEE80211_IS_CHAN_HT(ic->ic_curchan) && htcap != NULL) { rate = ieee80211_setup_htrates(ni, htcap, IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DOBRS); if (rate & IEEE80211_RATE_BASIC) { /* XXX 11n-specific stat */ ratesetmismatch(ni, wh, reassoc, resp, "HT", rate); return; } ieee80211_ht_node_init(ni, htcap); } else if (ni->ni_flags & IEEE80211_NODE_HT) ieee80211_ht_node_cleanup(ni); /* * Allow AMPDU operation only with unencrypted traffic * or AES-CCM; the 11n spec only specifies these ciphers * so permitting any others is undefined and can lead * to interoperability problems. * * NB: We check for AES by looking at the GTK cipher * since the WPA/11i specs say the PTK cipher has * to be "as good or better". */ if ((ni->ni_flags & IEEE80211_NODE_HT) && (((ic->ic_flags & IEEE80211_F_WPA) && rsnparms.rsn_mcastcipher != IEEE80211_CIPHER_AES_CCM) || (ic->ic_flags & (IEEE80211_F_WPA|IEEE80211_F_PRIVACY)) == IEEE80211_F_PRIVACY)) { IEEE80211_NOTE(ic, IEEE80211_MSG_ASSOC | IEEE80211_MSG_11N, ni, "disallow HT use because WEP or TKIP requested, " "capinfo 0x%x mcastcipher %d", capinfo, rsnparms.rsn_mcastcipher); ieee80211_ht_node_cleanup(ni); ic->ic_stats.is_ht_assoc_downgrade++; } /* * If constrained to 11n-only stations reject legacy stations. */ if ((ic->ic_flags_ext & IEEE80211_FEXT_PUREN) && (ni->ni_flags & IEEE80211_NODE_HT) == 0) { htcapmismatch(ni, wh, reassoc, resp); ic->ic_stats.is_ht_assoc_nohtcap++; return; } ni->ni_rssi = rssi; ni->ni_noise = noise; ni->ni_rstamp = rstamp; ni->ni_intval = lintval; ni->ni_capinfo = capinfo; ni->ni_chan = ic->ic_bsschan; ni->ni_fhdwell = ic->ic_bss->ni_fhdwell; ni->ni_fhindex = ic->ic_bss->ni_fhindex; /* * Store the IEs. * XXX maybe better to just expand */ if (ieee80211_ies_init(&ni->ni_ies, sfrm, efrm - sfrm)) { #define setie(_ie, _off) ieee80211_ies_setie(ni->ni_ies, _ie, _off) if (wpa != NULL) { setie(wpa_ie, wpa - sfrm); ni->ni_rsn = rsnparms; } if (rsn != NULL) { setie(rsn_ie, rsn - sfrm); ni->ni_rsn = rsnparms; } if (htcap != NULL) setie(htcap_ie, htcap - sfrm); if (wme != NULL) { setie(wme_ie, wme - sfrm); /* * Mark node as capable of QoS. */ ni->ni_flags |= IEEE80211_NODE_QOS; } else ni->ni_flags &= ~IEEE80211_NODE_QOS; if (ath != NULL) { setie(ath_ie, ath - sfrm); /* * Parse ATH station parameters. */ ieee80211_parse_ath(ni, ni->ni_ies.ath_ie); } else ni->ni_ath_flags = 0; #undef setie } else { ni->ni_flags &= ~IEEE80211_NODE_QOS; ni->ni_ath_flags = 0; } ieee80211_node_join(ic, ni, resp); ieee80211_deliver_l2uf(ni); break; } case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: { uint16_t capinfo, associd; uint16_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 * [tlv] WME * [tlv] HT capabilities * [tlv] HT info */ IEEE80211_VERIFY_LENGTH(efrm - frm, 6, return); ni = ic->ic_bss; capinfo = le16toh(*(uint16_t *)frm); frm += 2; status = le16toh(*(uint16_t *)frm); frm += 2; if (status != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] %sassoc failed (reason %d)\n", ether_sprintf(wh->i_addr2), ISREASSOC(subtype) ? "re" : "", status); if (ni != ic->ic_bss) /* XXX never true? */ ni->ni_fails++; ic->ic_stats.is_rx_auth_fail++; /* XXX */ return; } associd = le16toh(*(uint16_t *)frm); frm += 2; rates = xrates = wme = htcap = htinfo = NULL; while (efrm - frm > 1) { IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return); switch (*frm) { case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; case IEEE80211_ELEMID_HTCAP: htcap = frm; break; case IEEE80211_ELEMID_HTINFO: htinfo = frm; break; case IEEE80211_ELEMID_VENDOR: if (iswmeoui(frm)) wme = frm; else if (ic->ic_flags_ext & IEEE80211_FEXT_HTCOMPAT) { /* * Accept pre-draft HT ie's if the * standard ones have not been seen. */ if (ishtcapoui(frm)) { if (htcap == NULL) htcap = frm; } else if (ishtinfooui(frm)) { if (htinfo == NULL) htcap = frm; } } /* XXX Atheros OUI support */ break; } frm += frm[1] + 2; } IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE); if (xrates != NULL) IEEE80211_VERIFY_ELEMENT(xrates, IEEE80211_RATE_MAXSIZE - rates[1]); rate = ieee80211_setup_rates(ni, rates, xrates, IEEE80211_F_JOIN | IEEE80211_F_DOSORT | IEEE80211_F_DOFRATE | IEEE80211_F_DONEGO | IEEE80211_F_DODEL); if (rate & IEEE80211_RATE_BASIC) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] %sassoc failed (rate set mismatch)\n", ether_sprintf(wh->i_addr2), ISREASSOC(subtype) ? "re" : ""); if (ni != ic->ic_bss) /* XXX never true? */ ni->ni_fails++; ic->ic_stats.is_rx_assoc_norate++; ieee80211_new_state(ic, IEEE80211_S_SCAN, IEEE80211_SCAN_FAIL_STATUS); return; } ni->ni_capinfo = capinfo; ni->ni_associd = associd; if (wme != NULL && ieee80211_parse_wmeparams(ic, wme, wh) >= 0) { ni->ni_flags |= IEEE80211_NODE_QOS; ieee80211_wme_updateparams(ic); } else ni->ni_flags &= ~IEEE80211_NODE_QOS; /* * Setup HT state according to the negotiation. */ if ((ic->ic_htcaps & IEEE80211_HTC_HT) && htcap != NULL && htinfo != NULL) { ieee80211_ht_node_init(ni, htcap); ieee80211_parse_htinfo(ni, htinfo); ieee80211_setup_htrates(ni, htcap, IEEE80211_F_JOIN | IEEE80211_F_DOBRS); ieee80211_setup_basic_htrates(ni, htinfo); if (ni->ni_chan != ic->ic_bsschan) { /* * Channel has been adjusted based on * negotiated HT parameters; force the * channel state to follow. */ ieee80211_setbsschan(ic, ni->ni_chan); } } /* * Configure state now that we are associated. * * XXX may need different/additional driver callbacks? */ if (IEEE80211_IS_CHAN_A(ic->ic_curchan) || (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) { ic->ic_flags |= IEEE80211_F_SHPREAMBLE; ic->ic_flags &= ~IEEE80211_F_USEBARKER; } else { ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; ic->ic_flags |= IEEE80211_F_USEBARKER; } ieee80211_set_shortslottime(ic, IEEE80211_IS_CHAN_A(ic->ic_curchan) || (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); /* * Honor ERP protection. * * NB: ni_erp should zero for non-11g operation. */ if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) && (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) ic->ic_flags |= IEEE80211_F_USEPROT; else ic->ic_flags &= ~IEEE80211_F_USEPROT; IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] %sassoc success: %s preamble, %s slot time%s%s%s%s\n", ether_sprintf(wh->i_addr2), ISREASSOC(subtype) ? "re" : "", ic->ic_flags&IEEE80211_F_SHPREAMBLE ? "short" : "long", ic->ic_flags&IEEE80211_F_SHSLOT ? "short" : "long", ic->ic_flags&IEEE80211_F_USEPROT ? ", protection" : "", ni->ni_flags & IEEE80211_NODE_QOS ? ", QoS" : "", ni->ni_flags & IEEE80211_NODE_HT ? (ni->ni_chw == 20 ? ", HT20" : ", HT40") : "", ni->ni_flags & IEEE80211_NODE_AMPDU ? " (+AMPDU)" : "", IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_FF) ? ", fast-frames" : "", IEEE80211_ATH_CAP(ic, ni, IEEE80211_NODE_TURBOP) ? ", turbo" : "" ); ieee80211_new_state(ic, IEEE80211_S_RUN, subtype); break; } case IEEE80211_FC0_SUBTYPE_DEAUTH: { uint16_t reason; if (ic->ic_state == IEEE80211_S_SCAN) { ic->ic_stats.is_rx_mgtdiscard++; return; } /* * deauth frame format * [2] reason */ IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); reason = le16toh(*(uint16_t *)frm); ic->ic_stats.is_rx_deauth++; IEEE80211_NODE_STAT(ni, rx_deauth); if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { /* NB: can happen when in promiscuous mode */ ic->ic_stats.is_rx_mgtdiscard++; break; } IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH, "[%s] recv deauthenticate (reason %d)\n", ether_sprintf(ni->ni_macaddr), reason); switch (ic->ic_opmode) { case IEEE80211_M_STA: ieee80211_new_state(ic, IEEE80211_S_AUTH, (reason << 8) | IEEE80211_FC0_SUBTYPE_DEAUTH); break; case IEEE80211_M_HOSTAP: if (ni != ic->ic_bss) ieee80211_node_leave(ic, ni); break; default: ic->ic_stats.is_rx_mgtdiscard++; break; } break; } case IEEE80211_FC0_SUBTYPE_DISASSOC: { uint16_t reason; if (ic->ic_state != IEEE80211_S_RUN && ic->ic_state != IEEE80211_S_ASSOC && ic->ic_state != IEEE80211_S_AUTH) { ic->ic_stats.is_rx_mgtdiscard++; return; } /* * disassoc frame format * [2] reason */ IEEE80211_VERIFY_LENGTH(efrm - frm, 2, return); reason = le16toh(*(uint16_t *)frm); ic->ic_stats.is_rx_disassoc++; IEEE80211_NODE_STAT(ni, rx_disassoc); if (!IEEE80211_ADDR_EQ(wh->i_addr1, ic->ic_myaddr)) { /* NB: can happen when in promiscuous mode */ ic->ic_stats.is_rx_mgtdiscard++; break; } IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC, "[%s] recv disassociate (reason %d)\n", ether_sprintf(ni->ni_macaddr), reason); switch (ic->ic_opmode) { case IEEE80211_M_STA: ieee80211_new_state(ic, IEEE80211_S_ASSOC, 0); break; case IEEE80211_M_HOSTAP: if (ni != ic->ic_bss) ieee80211_node_leave(ic, ni); break; default: ic->ic_stats.is_rx_mgtdiscard++; break; } break; } case IEEE80211_FC0_SUBTYPE_ACTION: { const struct ieee80211_action *ia; if (ic->ic_state != IEEE80211_S_RUN && ic->ic_state != IEEE80211_S_ASSOC && ic->ic_state != IEEE80211_S_AUTH) { ic->ic_stats.is_rx_mgtdiscard++; return; } /* * action frame format: * [1] category * [1] action * [tlv] parameters */ IEEE80211_VERIFY_LENGTH(efrm - frm, sizeof(struct ieee80211_action), return); ia = (const struct ieee80211_action *) frm; ic->ic_stats.is_rx_action++; IEEE80211_NODE_STAT(ni, rx_action); /* verify frame payloads but defer processing */ /* XXX maybe push this to method */ switch (ia->ia_category) { case IEEE80211_ACTION_CAT_BA: switch (ia->ia_action) { case IEEE80211_ACTION_BA_ADDBA_REQUEST: IEEE80211_VERIFY_LENGTH(efrm - frm, sizeof(struct ieee80211_action_ba_addbarequest), return); break; case IEEE80211_ACTION_BA_ADDBA_RESPONSE: IEEE80211_VERIFY_LENGTH(efrm - frm, sizeof(struct ieee80211_action_ba_addbaresponse), return); break; case IEEE80211_ACTION_BA_DELBA: IEEE80211_VERIFY_LENGTH(efrm - frm, sizeof(struct ieee80211_action_ba_delba), return); break; } break; case IEEE80211_ACTION_CAT_HT: switch (ia->ia_action) { case IEEE80211_ACTION_HT_TXCHWIDTH: IEEE80211_VERIFY_LENGTH(efrm - frm, sizeof(struct ieee80211_action_ht_txchwidth), return); break; } break; } ic->ic_recv_action(ni, frm, efrm); break; } default: IEEE80211_DISCARD(ic, IEEE80211_MSG_ANY, wh, "mgt", "subtype 0x%x not handled", subtype); ic->ic_stats.is_rx_badsubtype++; break; } #undef ISREASSOC #undef ISPROBE } #undef IEEE80211_VERIFY_LENGTH #undef IEEE80211_VERIFY_ELEMENT /* * Process a received ps-poll frame. */ static void ieee80211_recv_pspoll(struct ieee80211com *ic, struct ieee80211_node *ni, struct mbuf *m0) { struct ieee80211_frame_min *wh; struct mbuf *m; uint16_t aid; int qlen; wh = mtod(m0, struct ieee80211_frame_min *); if (ni->ni_associd == 0) { IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, (struct ieee80211_frame *) wh, "ps-poll", "%s", "unassociated station"); ic->ic_stats.is_ps_unassoc++; IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_NOT_ASSOCED); return; } aid = le16toh(*(uint16_t *)wh->i_dur); if (aid != ni->ni_associd) { IEEE80211_DISCARD(ic, IEEE80211_MSG_POWER | IEEE80211_MSG_DEBUG, (struct ieee80211_frame *) wh, "ps-poll", "aid mismatch: sta aid 0x%x poll aid 0x%x", ni->ni_associd, aid); ic->ic_stats.is_ps_badaid++; /* * NB: We used to deauth the station but it turns out * the Blackberry Curve 8230 (and perhaps other devices) * sometimes send the wrong AID when WME is negotiated. * Being more lenient here seems ok as we already check * the station is associated and we only return frames * queued for the station (i.e. we don't use the AID). */ return; } /* Okay, take the first queued packet and put it out... */ IEEE80211_NODE_SAVEQ_DEQUEUE(ni, m, qlen); if (m == NULL) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] recv ps-poll, but queue empty\n", ether_sprintf(wh->i_addr2)); ieee80211_send_nulldata(ieee80211_ref_node(ni)); ic->ic_stats.is_ps_qempty++; /* XXX node stat */ if (ic->ic_set_tim != NULL) ic->ic_set_tim(ni, 0); /* just in case */ return; } /* * If there are more packets, set the more packets bit * in the packet dispatched to the station; otherwise * turn off the TIM bit. */ if (qlen != 0) { IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] recv ps-poll, send packet, %u still queued\n", ether_sprintf(ni->ni_macaddr), qlen); m->m_flags |= M_MORE_DATA; } else { IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER, "[%s] recv ps-poll, send packet, queue empty\n", ether_sprintf(ni->ni_macaddr)); if (ic->ic_set_tim != NULL) ic->ic_set_tim(ni, 0); } m->m_flags |= M_PWR_SAV; /* bypass PS handling */ IF_ENQUEUE(&ic->ic_ifp->if_snd, m); } #ifdef IEEE80211_DEBUG /* * Debugging support. */ void ieee80211_ssid_mismatch(struct ieee80211com *ic, const char *tag, uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid) { printf("[%s] discard %s frame, ssid mismatch: ", ether_sprintf(mac), tag); ieee80211_print_essid(ssid + 2, ssid[1]); printf("\n"); } /* * Return the bssid of a frame. */ static const uint8_t * ieee80211_getbssid(struct ieee80211com *ic, const struct ieee80211_frame *wh) { if (ic->ic_opmode == IEEE80211_M_STA) return wh->i_addr2; if ((wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) != IEEE80211_FC1_DIR_NODS) return wh->i_addr1; if ((wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) == IEEE80211_FC0_SUBTYPE_PS_POLL) return wh->i_addr1; return wh->i_addr3; } void ieee80211_note(struct ieee80211com *ic, const char *fmt, ...) { char buf[128]; /* XXX */ va_list ap; va_start(ap, fmt); vsnprintf(buf, sizeof(buf), fmt, ap); va_end(ap); if_printf(ic->ic_ifp, "%s", buf); /* NB: no \n */ } void ieee80211_note_frame(struct ieee80211com *ic, const struct ieee80211_frame *wh, const char *fmt, ...) { char buf[128]; /* XXX */ va_list ap; va_start(ap, fmt); vsnprintf(buf, sizeof(buf), fmt, ap); va_end(ap); if_printf(ic->ic_ifp, "[%s] %s\n", ether_sprintf(ieee80211_getbssid(ic, wh)), buf); } void ieee80211_note_mac(struct ieee80211com *ic, const uint8_t mac[IEEE80211_ADDR_LEN], const char *fmt, ...) { char buf[128]; /* XXX */ va_list ap; va_start(ap, fmt); vsnprintf(buf, sizeof(buf), fmt, ap); va_end(ap); if_printf(ic->ic_ifp, "[%s] %s\n", ether_sprintf(mac), buf); } void ieee80211_discard_frame(struct ieee80211com *ic, const struct ieee80211_frame *wh, const char *type, const char *fmt, ...) { va_list ap; printf("[%s:%s] discard ", ic->ic_ifp->if_xname, ether_sprintf(ieee80211_getbssid(ic, wh))); if (type != NULL) printf("%s frame, ", type); else printf("frame, "); va_start(ap, fmt); vprintf(fmt, ap); va_end(ap); printf("\n"); } void ieee80211_discard_ie(struct ieee80211com *ic, const struct ieee80211_frame *wh, const char *type, const char *fmt, ...) { va_list ap; printf("[%s:%s] discard ", ic->ic_ifp->if_xname, ether_sprintf(ieee80211_getbssid(ic, wh))); if (type != NULL) printf("%s information element, ", type); else printf("information element, "); va_start(ap, fmt); vprintf(fmt, ap); va_end(ap); printf("\n"); } void ieee80211_discard_mac(struct ieee80211com *ic, const uint8_t mac[IEEE80211_ADDR_LEN], const char *type, const char *fmt, ...) { va_list ap; printf("[%s:%s] discard ", ic->ic_ifp->if_xname, ether_sprintf(mac)); if (type != NULL) printf("%s frame, ", type); else printf("frame, "); va_start(ap, fmt); vprintf(fmt, ap); va_end(ap); printf("\n"); } #endif /* IEEE80211_DEBUG */