/* $OpenBSD: ieee80211_input.c,v 1.100 2008/08/14 16:07:58 damien Exp $ */ /*- * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting * Copyright (c) 2007, 2008 Damien Bergamini * 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. * * 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 "bpfilter.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if NBPFILTER > 0 #include #endif #ifdef INET #include #include #endif #include #include void ieee80211_deliver_data(struct ieee80211com *, struct mbuf *, struct ieee80211_node *); int ieee80211_parse_edca_params_body(struct ieee80211com *, const u_int8_t *); int ieee80211_parse_edca_params(struct ieee80211com *, const u_int8_t *); int ieee80211_parse_wmm_params(struct ieee80211com *, const u_int8_t *); enum ieee80211_cipher ieee80211_parse_rsn_cipher(const u_int8_t[]); enum ieee80211_akm ieee80211_parse_rsn_akm(const u_int8_t[]); int ieee80211_parse_rsn_body(struct ieee80211com *, const u_int8_t *, u_int, struct ieee80211_rsnparams *); int ieee80211_save_ie(const u_int8_t *, u_int8_t **); void ieee80211_recv_pspoll(struct ieee80211com *, struct mbuf *, struct ieee80211_node *); void ieee80211_recv_probe_resp(struct ieee80211com *, struct mbuf *, struct ieee80211_node *, struct ieee80211_rxinfo *, int); void ieee80211_recv_probe_req(struct ieee80211com *, struct mbuf *, struct ieee80211_node *, struct ieee80211_rxinfo *); void ieee80211_recv_auth(struct ieee80211com *, struct mbuf *, struct ieee80211_node *, struct ieee80211_rxinfo *); void ieee80211_recv_assoc_req(struct ieee80211com *, struct mbuf *, struct ieee80211_node *, struct ieee80211_rxinfo *, int); void ieee80211_recv_assoc_resp(struct ieee80211com *, struct mbuf *, struct ieee80211_node *, int); void ieee80211_recv_deauth(struct ieee80211com *, struct mbuf *, struct ieee80211_node *); void ieee80211_recv_disassoc(struct ieee80211com *, struct mbuf *, struct ieee80211_node *); void ieee80211_recv_action(struct ieee80211com *, struct mbuf *, struct ieee80211_node *); /* * Retrieve the length in bytes of a 802.11 header. */ u_int ieee80211_get_hdrlen(const void *data) { const u_int8_t *fc = data; u_int size = sizeof(struct ieee80211_frame); /* NB: doesn't work with control frames */ KASSERT((fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL); if ((fc[1] & IEEE80211_FC1_DIR_MASK) == IEEE80211_FC1_DIR_DSTODS) size += IEEE80211_ADDR_LEN; /* i_addr4 */ if ((fc[0] & (IEEE80211_FC0_TYPE_MASK | IEEE80211_FC0_SUBTYPE_QOS)) == (IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS)) { size += sizeof(u_int16_t); /* i_qos */ if (fc[1] & IEEE80211_FC1_ORDER) size += sizeof(u_int32_t); /* i_ht */ } else if ((fc[0] & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_MGT && (fc[1] & IEEE80211_FC1_ORDER)) size += sizeof(u_int32_t); /* i_ht */ return size; } /* * 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, struct ieee80211_rxinfo *rxi) { struct ieee80211com *ic = (void *)ifp; struct ieee80211_frame *wh; u_int16_t *orxseq, nrxseq; u_int8_t dir, type, subtype, tid; int hdrlen; #ifdef DIAGNOSTIC if (ni == NULL) panic("null node"); #endif /* in monitor mode, send everything directly to bpf */ if (ic->ic_opmode == IEEE80211_M_MONITOR) goto out; /* * Do not process frames without an Address 2 field any further. * Only CTS and ACK control frames do not have this field. */ if (m->m_len < sizeof(struct ieee80211_frame_min)) { DPRINTF(("frame too short, len %u\n", m->m_len)); ic->ic_stats.is_rx_tooshort++; goto out; } wh = mtod(m, struct ieee80211_frame *); if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) != IEEE80211_FC0_VERSION_0) { DPRINTF(("frame 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; if (type != IEEE80211_FC0_TYPE_CTL) { hdrlen = ieee80211_get_hdrlen(wh); if (m->m_len < hdrlen) { DPRINTF(("frame too short, len %u\n", m->m_len)); ic->ic_stats.is_rx_tooshort++; goto err; } } /* check and save sequence control field, if present */ if (ic->ic_state != IEEE80211_S_SCAN && type != IEEE80211_FC0_TYPE_CTL) { nrxseq = letoh16(*(u_int16_t *)wh->i_seq) >> IEEE80211_SEQ_SEQ_SHIFT; if ((wh->i_fc[0] & (IEEE80211_FC0_TYPE_MASK | IEEE80211_FC0_SUBTYPE_QOS)) == (IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS)) { if (dir == IEEE80211_FC1_DIR_DSTODS) { struct ieee80211_qosframe_addr4 *qwh4 = (struct ieee80211_qosframe_addr4 *)wh; tid = qwh4->i_qos[0] & 0x0f; } else { struct ieee80211_qosframe *qwh = (struct ieee80211_qosframe *)wh; tid = qwh->i_qos[0] & 0x0f; } orxseq = &ni->ni_qos_rxseqs[tid]; } else orxseq = &ni->ni_rxseq; if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) && nrxseq == *orxseq) { /* duplicate, silently discarded */ ic->ic_stats.is_rx_dup++; goto out; } *orxseq = nrxseq; } if (ic->ic_state != IEEE80211_S_SCAN) { ni->ni_rssi = rxi->rxi_rssi; ni->ni_rstamp = rxi->rxi_tstamp; ni->ni_inact = 0; } if ((ic->ic_caps & IEEE80211_C_PMGT) && ic->ic_opmode == IEEE80211_M_HOSTAP && ni->ni_state == IEEE80211_STA_ASSOC) { if (wh->i_fc[1] & IEEE80211_FC1_PWR_MGT) { if (ni->ni_pwrsave == IEEE80211_PS_AWAKE) { /* turn on PS mode */ ni->ni_pwrsave = IEEE80211_PS_DOZE; ic->ic_pssta++; DPRINTF(("PS mode on for %s, count %d\n", ether_sprintf(wh->i_addr2), ic->ic_pssta)); } } else if (ni->ni_pwrsave == IEEE80211_PS_DOZE) { /* turn off PS mode */ ni->ni_pwrsave = IEEE80211_PS_AWAKE; ic->ic_pssta--; DPRINTF(("PS mode off for %s, count %d\n", ether_sprintf(wh->i_addr2), ic->ic_pssta)); (*ic->ic_set_tim)(ic, ni->ni_associd, 0); /* dequeue buffered unicast frames */ 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. */ DPRINTF(("discard frame from SA %s\n", 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 frame * 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, etherbroadcastaddr)) { /* Destination is not our BSS or broadcast. */ DPRINTF(("discard data frame to DA %s\n", 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, etherbroadcastaddr)) { /* BSS is not us or broadcast. */ DPRINTF(("discard data frame to BSS %s\n", ether_sprintf(wh->i_addr1))); ic->ic_stats.is_rx_wrongbss++; goto out; } /* check if source STA is associated */ if (ni == ic->ic_bss) { DPRINTF(("data from unknown src %s\n", 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) { DPRINTF(("data from unassoc src %s\n", 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: /* can't get there */ goto out; } if ((ic->ic_flags & IEEE80211_F_WEPON) || ((ic->ic_flags & IEEE80211_F_RSNON) && (ni->ni_flags & IEEE80211_NODE_RXPROT))) { /* protection is on for Rx */ if (!(rxi->rxi_flags & IEEE80211_RXI_HWDEC)) { if (!(wh->i_fc[1] & IEEE80211_FC1_PROTECTED)) { /* drop unencrypted */ ic->ic_stats.is_rx_unencrypted++; goto err; } /* do software decryption */ m = ieee80211_decrypt(ic, m, ni); if (m == NULL) { ic->ic_stats.is_rx_wepfail++; goto err; } wh = mtod(m, struct ieee80211_frame *); } } else if ((wh->i_fc[1] & IEEE80211_FC1_PROTECTED) || (rxi->rxi_flags & IEEE80211_RXI_HWDEC)) { /* frame encrypted but protection off for Rx */ 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, BPF_DIRECTION_IN); #endif m = ieee80211_decap(ifp, m, hdrlen); if (m == NULL) { DPRINTF(("decapsulation error for src %s\n", ether_sprintf(wh->i_addr2))); ic->ic_stats.is_rx_decap++; goto err; } ieee80211_deliver_data(ic, m, ni); 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; } } if (ni->ni_flags & IEEE80211_NODE_RXMGMTPROT) { /* MMPDU protection is on for Rx */ if (subtype == IEEE80211_FC0_SUBTYPE_DISASSOC || subtype == IEEE80211_FC0_SUBTYPE_DEAUTH || subtype == IEEE80211_FC0_SUBTYPE_ACTION) { if (!IEEE80211_IS_MULTICAST(wh->i_addr1) && !(wh->i_fc[1] & IEEE80211_FC1_PROTECTED)) { /* unicast mgmt not encrypted */ goto out; } /* do software decryption */ m = ieee80211_decrypt(ic, m, ni); if (m == NULL) { /* XXX stats */ goto out; } wh = mtod(m, struct ieee80211_frame *); } } else if ((ic->ic_flags & IEEE80211_F_RSNON) && (wh->i_fc[1] & IEEE80211_FC1_PROTECTED)) { /* encrypted but MMPDU Rx protection off for TA */ goto out; } if (ifp->if_flags & IFF_DEBUG) { /* avoid to print too many frames */ int doprint = 0; switch (subtype) { case IEEE80211_FC0_SUBTYPE_BEACON: if (ic->ic_state == IEEE80211_S_SCAN) doprint = 1; break; case IEEE80211_FC0_SUBTYPE_PROBE_REQ: if (ic->ic_opmode == IEEE80211_M_IBSS) doprint = 1; break; default: doprint = 1; break; } #ifdef IEEE80211_DEBUG doprint += ieee80211_debug; #endif if (doprint) printf("%s: received %s from %s rssi %d mode %s\n", ifp->if_xname, ieee80211_mgt_subtype_name[subtype >> IEEE80211_FC0_SUBTYPE_SHIFT], ether_sprintf(wh->i_addr2), rxi->rxi_rssi, ieee80211_phymode_name[ieee80211_chan2mode(ic, ic->ic_bss->ni_chan)]); } #if NBPFILTER > 0 if (ic->ic_rawbpf) bpf_mtap(ic->ic_rawbpf, m, BPF_DIRECTION_IN); /* * Drop mbuf if it was filtered by bpf. Normally, this is * done in ether_input() but IEEE 802.11 management frames * are a special case. */ if (m->m_flags & M_FILDROP) { m_freem(m); return; } #endif (*ic->ic_recv_mgmt)(ic, m, ni, rxi, subtype); m_freem(m); return; case IEEE80211_FC0_TYPE_CTL: ic->ic_stats.is_rx_ctl++; subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK; switch (subtype) { case IEEE80211_FC0_SUBTYPE_PS_POLL: ieee80211_recv_pspoll(ic, m, ni); break; case IEEE80211_FC0_SUBTYPE_BAR: /* NYI */ break; case IEEE80211_FC0_SUBTYPE_BA: /* NYI */ break; } goto out; default: DPRINTF(("bad frame type %x\n", 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, BPF_DIRECTION_IN); #endif m_freem(m); } } void ieee80211_deliver_data(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) { struct ifnet *ifp = &ic->ic_if; struct ieee80211_node *ni1; struct ether_header *eh; struct mbuf *m1; int error, len; eh = mtod(m, struct ether_header *); if ((ic->ic_flags & IEEE80211_F_RSNON) && !ni->ni_port_valid && eh->ether_type != htons(ETHERTYPE_PAE)) { DPRINTF(("port not valid: %s\n", ether_sprintf(eh->ether_dhost))); ic->ic_stats.is_rx_unauth++; m_freem(m); return; } ifp->if_ipackets++; /* * Perform as a bridge within the AP. Notice that we do not * bridge EAPOL frames as suggested in C.1.1 of IEEE Std 802.1X. */ m1 = NULL; if (ic->ic_opmode == IEEE80211_M_HOSTAP && !(ic->ic_flags & IEEE80211_F_NOBRIDGE) && eh->ether_type != htons(ETHERTYPE_PAE)) { if (ETHER_IS_MULTICAST(eh->ether_dhost)) { m1 = m_copym(m, 0, M_COPYALL, M_DONTWAIT); if (m1 == NULL) ifp->if_oerrors++; else m1->m_flags |= M_MCAST; } else { ni1 = ieee80211_find_node(ic, eh->ether_dhost); if (ni1 != NULL && ni1->ni_state == IEEE80211_STA_ASSOC) { m1 = m; m = NULL; } } if (m1 != NULL) { len = m1->m_pkthdr.len; IFQ_ENQUEUE(&ifp->if_snd, m1, NULL, error); if (error) ifp->if_oerrors++; else { if (m != NULL) ifp->if_omcasts++; ifp->if_obytes += len; if_start(ifp); } } } if (m != NULL) { #if NBPFILTER > 0 /* * If we forward frame 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, BPF_DIRECTION_IN); #endif if ((ic->ic_flags & IEEE80211_F_RSNON) && eh->ether_type == htons(ETHERTYPE_PAE)) ieee80211_eapol_key_input(ic, m, ni); else ether_input_mbuf(ifp, m); } } struct mbuf * ieee80211_decap(struct ifnet *ifp, struct mbuf *m, int hdrlen) { struct ieee80211_qosframe_addr4 wh; /* largest 802.11 header */ struct ether_header *eh; struct llc *llc; if (m->m_len < hdrlen + LLC_SNAPFRAMELEN) { m = m_pullup(m, hdrlen + LLC_SNAPFRAMELEN); if (m == NULL) 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 + LLC_SNAPFRAMELEN - 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; } 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; } M_DUP_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; } if (llc != NULL) { eh = mtod(m, struct ether_header *); eh->ether_type = htons(m->m_pkthdr.len - sizeof(*eh)); } return m; } /* * Parse an EDCA Parameter Set element (see 7.3.2.27). */ int ieee80211_parse_edca_params_body(struct ieee80211com *ic, const u_int8_t *frm) { u_int updtcount; int aci; /* * Check if EDCA parameters have changed XXX if we miss more than * 15 consecutive beacons, we might not detect changes to EDCA * parameters due to wraparound of the 4-bit Update Count field. */ updtcount = frm[0] & 0xf; if (updtcount == ic->ic_edca_updtcount) return 0; /* no changes to EDCA parameters, ignore */ ic->ic_edca_updtcount = updtcount; frm += 2; /* skip QoS Info & Reserved fields */ /* parse AC Parameter Records */ for (aci = 0; aci < EDCA_NUM_AC; aci++) { struct ieee80211_edca_ac_params *ac = &ic->ic_edca_ac[aci]; ac->ac_acm = (frm[0] >> 4) & 0x1; ac->ac_aifsn = frm[0] & 0xf; ac->ac_ecwmin = frm[1] & 0xf; ac->ac_ecwmax = frm[1] >> 4; ac->ac_txoplimit = LE_READ_2(frm + 2); frm += 4; } /* give drivers a chance to update their settings */ if ((ic->ic_flags & IEEE80211_F_QOS) && ic->ic_updateedca != NULL) (*ic->ic_updateedca)(ic); return 0; } int ieee80211_parse_edca_params(struct ieee80211com *ic, const u_int8_t *frm) { if (frm[1] < 18) { ic->ic_stats.is_rx_elem_toosmall++; return IEEE80211_REASON_IE_INVALID; } return ieee80211_parse_edca_params_body(ic, frm + 2); } int ieee80211_parse_wmm_params(struct ieee80211com *ic, const u_int8_t *frm) { if (frm[1] < 24) { ic->ic_stats.is_rx_elem_toosmall++; return IEEE80211_REASON_IE_INVALID; } return ieee80211_parse_edca_params_body(ic, frm + 8); } enum ieee80211_cipher ieee80211_parse_rsn_cipher(const u_int8_t selector[4]) { if (memcmp(selector, MICROSOFT_OUI, 3) == 0) { /* WPA */ switch (selector[3]) { case 0: /* use group data cipher suite */ return IEEE80211_CIPHER_USEGROUP; case 1: /* WEP-40 */ return IEEE80211_CIPHER_WEP40; case 2: /* TKIP */ return IEEE80211_CIPHER_TKIP; case 4: /* CCMP (RSNA default) */ return IEEE80211_CIPHER_CCMP; case 5: /* WEP-104 */ return IEEE80211_CIPHER_WEP104; } } else if (memcmp(selector, IEEE80211_OUI, 3) == 0) { /* RSN */ /* from IEEE Std 802.11 - Table 20da */ switch (selector[3]) { case 0: /* use group data cipher suite */ return IEEE80211_CIPHER_USEGROUP; case 1: /* WEP-40 */ return IEEE80211_CIPHER_WEP40; case 2: /* TKIP */ return IEEE80211_CIPHER_TKIP; case 4: /* CCMP (RSNA default) */ return IEEE80211_CIPHER_CCMP; case 5: /* WEP-104 */ return IEEE80211_CIPHER_WEP104; case 6: /* AES-128-CMAC */ return IEEE80211_CIPHER_AES128_CMAC; } } return IEEE80211_CIPHER_NONE; /* ignore unknown ciphers */ } enum ieee80211_akm ieee80211_parse_rsn_akm(const u_int8_t selector[4]) { if (memcmp(selector, MICROSOFT_OUI, 3) == 0) { /* WPA */ switch (selector[3]) { case 1: /* IEEE 802.1X (RSNA default) */ return IEEE80211_AKM_8021X; case 2: /* PSK */ return IEEE80211_AKM_PSK; } } else if (memcmp(selector, IEEE80211_OUI, 3) == 0) { /* RSN */ /* from IEEE Std 802.11i-2004 - Table 20dc */ switch (selector[3]) { case 1: /* IEEE 802.1X (RSNA default) */ return IEEE80211_AKM_8021X; case 2: /* PSK */ return IEEE80211_AKM_PSK; case 3: /* Fast BSS Transition IEEE 802.1X */ return IEEE80211_AKM_FBT_8021X; case 4: /* Fast BSS Transition PSK */ return IEEE80211_AKM_FBT_PSK; case 5: /* IEEE 802.1X with SHA256 KDF */ return IEEE80211_AKM_SHA256_8021X; case 6: /* PSK with SHA256 KDF */ return IEEE80211_AKM_SHA256_PSK; } } return IEEE80211_AKM_NONE; /* ignore unknown AKMs */ } /* * Parse an RSN element (see 7.3.2.25). */ int ieee80211_parse_rsn_body(struct ieee80211com *ic, const u_int8_t *frm, u_int len, struct ieee80211_rsnparams *rsn) { const u_int8_t *efrm; u_int16_t m, n, s; efrm = frm + len; /* check Version field */ if (LE_READ_2(frm) != 1) return IEEE80211_STATUS_RSN_IE_VER_UNSUP; frm += 2; /* all fields after the Version field are optional */ /* if Cipher Suite missing, default to CCMP */ rsn->rsn_groupcipher = IEEE80211_CIPHER_CCMP; rsn->rsn_nciphers = 1; rsn->rsn_ciphers = IEEE80211_CIPHER_CCMP; /* if Group Management Cipher Suite missing, defaut to AES-128-CMAC */ rsn->rsn_groupmgmtcipher = IEEE80211_CIPHER_AES128_CMAC; /* if AKM Suite missing, default to 802.1X */ rsn->rsn_nakms = 1; rsn->rsn_akms = IEEE80211_AKM_8021X; /* if RSN capabilities missing, default to 0 */ rsn->rsn_caps = 0; /* read Group Data Cipher Suite field */ if (frm + 4 > efrm) return 0; rsn->rsn_groupcipher = ieee80211_parse_rsn_cipher(frm); if (rsn->rsn_groupcipher == IEEE80211_CIPHER_USEGROUP) return IEEE80211_STATUS_BAD_GROUP_CIPHER; frm += 4; /* read Pairwise Cipher Suite Count field */ if (frm + 2 > efrm) return 0; m = rsn->rsn_nciphers = LE_READ_2(frm); frm += 2; /* read Pairwise Cipher Suite List */ if (frm + m * 4 > efrm) return IEEE80211_STATUS_IE_INVALID; rsn->rsn_ciphers = IEEE80211_CIPHER_NONE; while (m-- > 0) { rsn->rsn_ciphers |= ieee80211_parse_rsn_cipher(frm); frm += 4; } if (rsn->rsn_ciphers & IEEE80211_CIPHER_USEGROUP) { if (rsn->rsn_ciphers != IEEE80211_CIPHER_USEGROUP) return IEEE80211_STATUS_BAD_PAIRWISE_CIPHER; if (rsn->rsn_groupcipher == IEEE80211_CIPHER_CCMP) return IEEE80211_STATUS_BAD_PAIRWISE_CIPHER; } /* read AKM Suite List Count field */ if (frm + 2 > efrm) return 0; n = rsn->rsn_nakms = LE_READ_2(frm); frm += 2; /* read AKM Suite List */ if (frm + n * 4 > efrm) return IEEE80211_STATUS_IE_INVALID; rsn->rsn_akms = IEEE80211_AKM_NONE; while (n-- > 0) { rsn->rsn_akms |= ieee80211_parse_rsn_akm(frm); frm += 4; } /* read RSN Capabilities field */ if (frm + 2 > efrm) return 0; rsn->rsn_caps = LE_READ_2(frm); frm += 2; /* read PMKID Count field */ if (frm + 2 > efrm) return 0; s = LE_READ_2(frm); frm += 2; /* read PMKID List */ if (frm + s * IEEE80211_PMKID_LEN > efrm) return IEEE80211_STATUS_IE_INVALID; while (s-- > 0) { /* ignore PMKIDs for now */ frm += IEEE80211_PMKID_LEN; } /* read Group Management Cipher Suite field */ if (frm + 4 > efrm) return 0; rsn->rsn_groupmgmtcipher = ieee80211_parse_rsn_cipher(frm); return IEEE80211_STATUS_SUCCESS; } int ieee80211_parse_rsn(struct ieee80211com *ic, const u_int8_t *frm, struct ieee80211_rsnparams *rsn) { if (frm[1] < 2) { ic->ic_stats.is_rx_elem_toosmall++; return IEEE80211_STATUS_IE_INVALID; } return ieee80211_parse_rsn_body(ic, frm + 2, frm[1], rsn); } int ieee80211_parse_wpa(struct ieee80211com *ic, const u_int8_t *frm, struct ieee80211_rsnparams *rsn) { if (frm[1] < 6) { ic->ic_stats.is_rx_elem_toosmall++; return IEEE80211_STATUS_IE_INVALID; } return ieee80211_parse_rsn_body(ic, frm + 6, frm[1] - 4, rsn); } /* * Create (or update) a copy of an information element. */ int ieee80211_save_ie(const u_int8_t *frm, u_int8_t **ie) { if (*ie == NULL || (*ie)[1] != frm[1]) { if (*ie != NULL) free(*ie, M_DEVBUF); *ie = malloc(2 + frm[1], M_DEVBUF, M_NOWAIT); if (*ie == NULL) return ENOMEM; } memcpy(*ie, frm, 2 + frm[1]); return 0; } /*- * Beacon/Probe response frame format: * [8] Timestamp * [2] Beacon interval * [2] Capability * [tlv] Service Set Identifier (SSID) * [tlv] Supported rates * [tlv*] Frequency-Hopping (FH) Parameter Set * [tlv*] DS Parameter Set (802.11g) * [tlv] ERP Information (802.11g) * [tlv] Extended Supported Rates (802.11g) * [tlv] RSN (802.11i) * [tlv] EDCA Parameter Set (802.11e) * [tlv] QoS Capability (Beacon only, 802.11e) */ void ieee80211_recv_probe_resp(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi, int isprobe) { const struct ieee80211_frame *wh; const u_int8_t *frm, *efrm; const u_int8_t *tstamp, *ssid, *rates, *xrates, *edcaie, *wmmie; const u_int8_t *rsnie, *wpaie; u_int16_t capinfo, bintval, fhdwell; u_int8_t chan, bchan, fhindex, erp; int is_new; /* * 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 frames) 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 operating mode", __func__); } #endif /* make sure all mandatory fixed fields are present */ if (m0->m_len < sizeof(*wh) + 12) { DPRINTF(("frame too short\n")); return; } wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; efrm = mtod(m0, u_int8_t *) + m0->m_len; tstamp = frm; frm += 8; bintval = LE_READ_2(frm); frm += 2; capinfo = LE_READ_2(frm); frm += 2; ssid = rates = xrates = edcaie = wmmie = rsnie = wpaie = NULL; bchan = ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan); chan = bchan; fhdwell = 0; fhindex = 0; erp = 0; while (frm + 2 <= efrm) { if (frm + 2 + frm[1] > efrm) { ic->ic_stats.is_rx_elem_toosmall++; break; } switch (frm[0]) { case IEEE80211_ELEMID_SSID: ssid = frm; break; case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_FHPARMS: if (ic->ic_phytype != IEEE80211_T_FH) break; if (frm[1] < 5) { ic->ic_stats.is_rx_elem_toosmall++; break; } fhdwell = LE_READ_2(frm + 2); chan = IEEE80211_FH_CHAN(frm[4], frm[5]); fhindex = frm[6]; break; case IEEE80211_ELEMID_DSPARMS: if (ic->ic_phytype == IEEE80211_T_FH) break; if (frm[1] < 1) { ic->ic_stats.is_rx_elem_toosmall++; break; } 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) { ic->ic_stats.is_rx_elem_toosmall++; break; } erp = frm[2]; break; case IEEE80211_ELEMID_RSN: rsnie = frm; break; case IEEE80211_ELEMID_EDCAPARMS: edcaie = frm; break; case IEEE80211_ELEMID_QOS_CAP: break; case IEEE80211_ELEMID_VENDOR: if (frm[1] < 4) { ic->ic_stats.is_rx_elem_toosmall++; break; } if (memcmp(frm + 2, MICROSOFT_OUI, 3) == 0) { if (frm[5] == 1) wpaie = frm; else if (frm[1] >= 5 && frm[5] == 2 && frm[6] == 1) wmmie = frm; } break; default: DPRINTF(("element id %u/len %u ignored\n", frm[0], frm[1])); ic->ic_stats.is_rx_elem_unknown++; break; } frm += 2 + frm[1]; } /* supported rates element is mandatory */ if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { DPRINTF(("invalid supported rates element\n")); return; } /* SSID element is mandatory */ if (ssid == NULL || ssid[1] > IEEE80211_NWID_LEN) { DPRINTF(("invalid SSID element\n")); return; } if ( #if IEEE80211_CHAN_MAX < 255 chan > IEEE80211_CHAN_MAX || #endif isclr(ic->ic_chan_active, chan)) { DPRINTF(("ignore %s with invalid channel %u\n", isprobe ? "probe response" : "beacon", chan)); ic->ic_stats.is_rx_badchan++; return; } if ((ic->ic_state != IEEE80211_S_SCAN || !(ic->ic_caps & IEEE80211_C_SCANALL)) && 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. */ DPRINTF(("ignore %s on channel %u marked for channel %u\n", isprobe ? "probe response" : "beacon", bchan, chan)); ic->ic_stats.is_rx_chanmismatch++; return; } /* * Use mac, channel and rssi so we collect only the * best potential AP with the equal bssid while scanning. * Collecting all potential APs may result in bloat of * the node tree. This call will return NULL if the node * for this APs does not exist or if the new node is the * potential better one. */ if ((ni = ieee80211_find_node_for_beacon(ic, wh->i_addr2, &ic->ic_channels[chan], ssid, rxi->rxi_rssi)) != NULL) return; #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 ? "probe response" : "beacon", chan, bchan); ieee80211_print_essid(ssid + 2, ssid[1]); printf(" from %s\n", ether_sprintf((u_int8_t *)wh->i_addr2)); printf("%s: caps 0x%x bintval %u erp 0x%x\n", __func__, capinfo, bintval, erp); } #endif if ((ni = ieee80211_find_node(ic, wh->i_addr2)) == NULL) { ni = ieee80211_alloc_node(ic, wh->i_addr2); if (ni == NULL) return; is_new = 1; } else is_new = 0; /* * When operating in station mode, check for state updates * while we're associated. We consider only 11g stuff right * now. */ if (ic->ic_opmode == IEEE80211_M_STA && ic->ic_state == IEEE80211_S_RUN && ni->ni_state == IEEE80211_STA_BSS) { /* * Check if protection mode has changed since last beacon. */ if (ni->ni_erp != erp) { DPRINTF(("[%s] erp change: was 0x%x, now 0x%x\n", ether_sprintf((u_int8_t *)wh->i_addr2), ni->ni_erp, erp)); if (ic->ic_curmode == IEEE80211_MODE_11G && (erp & IEEE80211_ERP_USE_PROTECTION)) ic->ic_flags |= IEEE80211_F_USEPROT; else ic->ic_flags &= ~IEEE80211_F_USEPROT; ic->ic_bss->ni_erp = erp; } /* * Check if AP short slot time setting has changed * since last beacon and give the driver a chance to * update the hardware. */ if ((ni->ni_capinfo ^ capinfo) & IEEE80211_CAPINFO_SHORT_SLOTTIME) { ieee80211_set_shortslottime(ic, ic->ic_curmode == IEEE80211_MODE_11A || (capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); } } /* * We do not try to update EDCA parameters if QoS was not negotiated * with the AP at association time. */ if (ni->ni_flags & IEEE80211_NODE_QOS) { /* always prefer EDCA IE over Wi-Fi Alliance WMM IE */ if (edcaie != NULL) ieee80211_parse_edca_params(ic, edcaie); else if (wmmie != NULL) ieee80211_parse_wmm_params(ic, wmmie); } if (ic->ic_state == IEEE80211_S_SCAN && ic->ic_opmode != IEEE80211_M_HOSTAP && (ic->ic_flags & IEEE80211_F_RSNON)) { struct ieee80211_rsnparams rsn; const u_int8_t *saveie = NULL; /* * If the AP advertises both RSN and WPA IEs (WPA1+WPA2), * we only store the parameters of the highest protocol * version we support. */ if (rsnie != NULL && (ic->ic_rsnprotos & IEEE80211_PROTO_RSN)) { if (ieee80211_parse_rsn(ic, rsnie, &rsn) == 0) { ni->ni_rsnprotos = IEEE80211_PROTO_RSN; saveie = rsnie; } } else if (wpaie != NULL && (ic->ic_rsnprotos & IEEE80211_PROTO_WPA)) { if (ieee80211_parse_wpa(ic, wpaie, &rsn) == 0) { ni->ni_rsnprotos = IEEE80211_PROTO_WPA; saveie = wpaie; } } if (saveie != NULL && ieee80211_save_ie(saveie, &ni->ni_rsnie) == 0) { ni->ni_rsnakms = rsn.rsn_akms; ni->ni_rsnciphers = rsn.rsn_ciphers; ni->ni_rsngroupcipher = rsn.rsn_groupcipher; ni->ni_rsngroupmgmtcipher = rsn.rsn_groupmgmtcipher; ni->ni_rsncaps = rsn.rsn_caps; } else ni->ni_rsnprotos = IEEE80211_PROTO_NONE; } else if (ic->ic_state == IEEE80211_S_SCAN) ni->ni_rsnprotos = IEEE80211_PROTO_NONE; if (ssid[1] != 0 && ni->ni_esslen == 0) { ni->ni_esslen = ssid[1]; memset(ni->ni_essid, 0, sizeof(ni->ni_essid)); /* we know that ssid[1] <= IEEE80211_NWID_LEN */ memcpy(ni->ni_essid, &ssid[2], ssid[1]); } IEEE80211_ADDR_COPY(ni->ni_bssid, wh->i_addr3); ni->ni_rssi = rxi->rxi_rssi; ni->ni_rstamp = rxi->rxi_tstamp; memcpy(ni->ni_tstamp, tstamp, sizeof(ni->ni_tstamp)); ni->ni_intval = bintval; ni->ni_capinfo = 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)) { /* * 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); } } /*- * Probe request frame format: * [tlv] SSID * [tlv] Supported rates * [tlv] Extended Supported Rates (802.11g) */ void ieee80211_recv_probe_req(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi) { const struct ieee80211_frame *wh; const u_int8_t *frm, *efrm; const u_int8_t *ssid, *rates, *xrates; u_int8_t rate; if (ic->ic_opmode == IEEE80211_M_STA || ic->ic_state != IEEE80211_S_RUN) return; wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; efrm = mtod(m0, u_int8_t *) + m0->m_len; ssid = rates = xrates = NULL; while (frm + 2 <= efrm) { if (frm + 2 + frm[1] > efrm) { ic->ic_stats.is_rx_elem_toosmall++; break; } switch (frm[0]) { case IEEE80211_ELEMID_SSID: ssid = frm; break; case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; } frm += 2 + frm[1]; } /* supported rates element is mandatory */ if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { DPRINTF(("invalid supported rates element\n")); return; } /* SSID element is mandatory */ if (ssid == NULL || ssid[1] > IEEE80211_NWID_LEN) { DPRINTF(("invalid SSID element\n")); return; } /* check that the specified SSID (if not wildcard) matches ours */ if (ssid[1] != 0 && (ssid[1] != ic->ic_bss->ni_esslen || memcmp(&ssid[2], ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen))) { DPRINTF(("SSID mismatch\n")); ic->ic_stats.is_rx_ssidmismatch++; return; } /* refuse wildcard SSID if we're hiding our SSID in beacons */ if (ssid[1] == 0 && (ic->ic_flags & IEEE80211_F_HIDENWID)) { DPRINTF(("wildcard SSID rejected")); ic->ic_stats.is_rx_ssidmismatch++; return; } if (ni == ic->ic_bss) { ni = ieee80211_dup_bss(ic, wh->i_addr2); if (ni == NULL) return; DPRINTF(("new probe req from %s\n", ether_sprintf((u_int8_t *)wh->i_addr2))); } ni->ni_rssi = rxi->rxi_rssi; ni->ni_rstamp = rxi->rxi_tstamp; 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) { DPRINTF(("rate mismatch for %s\n", ether_sprintf((u_int8_t *)wh->i_addr2))); return; } IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_PROBE_RESP, 0); } /*- * Authentication frame format: * [2] Authentication algorithm number * [2] Authentication transaction sequence number * [2] Status code */ void ieee80211_recv_auth(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi) { const struct ieee80211_frame *wh; const u_int8_t *frm; u_int16_t algo, seq, status; /* make sure all mandatory fixed fields are present */ if (m0->m_len < sizeof(*wh) + 6) { DPRINTF(("frame too short\n")); return; } wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; algo = LE_READ_2(frm); frm += 2; seq = LE_READ_2(frm); frm += 2; status = LE_READ_2(frm); frm += 2; DPRINTF(("auth %d seq %d from %s\n", algo, seq, ether_sprintf((u_int8_t *)wh->i_addr2))); /* only "open" auth mode is supported */ if (algo != IEEE80211_AUTH_ALG_OPEN) { DPRINTF(("unsupported auth algorithm %d from %s\n", algo, ether_sprintf((u_int8_t *)wh->i_addr2))); ic->ic_stats.is_rx_auth_unsupported++; if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* XXX hack to workaround calling convention */ IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, (seq+1) | (IEEE80211_STATUS_ALG<<16)); } return; } ieee80211_auth_open(ic, wh, ni, rxi, seq, status); } /*- * (Re)Association request frame format: * [2] Capability information * [2] Listen interval * [6*] Current AP address (Reassociation only) * [tlv] SSID * [tlv] Supported rates * [tlv] Extended Supported Rates (802.11g) * [tlv] RSN (802.11i) * [tlv] QoS Capability (802.11e) */ void ieee80211_recv_assoc_req(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi, int reassoc) { const struct ieee80211_frame *wh; const u_int8_t *frm, *efrm; const u_int8_t *ssid, *rates, *xrates, *rsnie, *wpaie; u_int16_t capinfo, bintval; int resp, status = 0; struct ieee80211_rsnparams rsn; u_int8_t rate; if (ic->ic_opmode != IEEE80211_M_HOSTAP || ic->ic_state != IEEE80211_S_RUN) return; /* make sure all mandatory fixed fields are present */ if (m0->m_len < sizeof(*wh) + (reassoc ? 10 : 4)) { DPRINTF(("frame too short\n")); return; } wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; efrm = mtod(m0, u_int8_t *) + m0->m_len; if (!IEEE80211_ADDR_EQ(wh->i_addr3, ic->ic_bss->ni_bssid)) { DPRINTF(("ignore other bss from %s\n", ether_sprintf((u_int8_t *)wh->i_addr2))); ic->ic_stats.is_rx_assoc_bss++; return; } capinfo = LE_READ_2(frm); frm += 2; bintval = LE_READ_2(frm); frm += 2; if (reassoc) frm += IEEE80211_ADDR_LEN; /* skip current AP address */ ssid = rates = xrates = rsnie = wpaie = NULL; while (frm + 2 <= efrm) { if (frm + 2 + frm[1] > efrm) { ic->ic_stats.is_rx_elem_toosmall++; break; } switch (frm[0]) { case IEEE80211_ELEMID_SSID: ssid = frm; break; case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; case IEEE80211_ELEMID_RSN: rsnie = frm; break; case IEEE80211_ELEMID_QOS_CAP: break; case IEEE80211_ELEMID_VENDOR: if (frm[1] < 4) { ic->ic_stats.is_rx_elem_toosmall++; break; } if (memcmp(frm + 2, MICROSOFT_OUI, 3) == 0) { if (frm[5] == 1) wpaie = frm; } break; } frm += 2 + frm[1]; } /* supported rates element is mandatory */ if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { DPRINTF(("invalid supported rates element\n")); return; } /* SSID element is mandatory */ if (ssid == NULL || ssid[1] > IEEE80211_NWID_LEN) { DPRINTF(("invalid SSID element\n")); return; } /* check that the specified SSID matches ours */ if (ssid[1] != ic->ic_bss->ni_esslen || memcmp(&ssid[2], ic->ic_bss->ni_essid, ic->ic_bss->ni_esslen)) { DPRINTF(("SSID mismatch\n")); ic->ic_stats.is_rx_ssidmismatch++; return; } if (ni->ni_state != IEEE80211_STA_AUTH && ni->ni_state != IEEE80211_STA_ASSOC) { DPRINTF(("deny %sassoc from %s, not authenticated\n", reassoc ? "re" : "", ether_sprintf((u_int8_t *)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; } if (!(capinfo & IEEE80211_CAPINFO_ESS)) { ic->ic_stats.is_rx_assoc_capmismatch++; status = IEEE80211_STATUS_CAPINFO; goto end; } 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) { ic->ic_stats.is_rx_assoc_norate++; status = IEEE80211_STATUS_BASIC_RATE; goto end; } if (ic->ic_flags & IEEE80211_F_RSNON) { const u_int8_t *saveie; /* * A station should never include both a WPA and an RSN IE * in its (Re)Association Requests, but if it does, we only * consider the IE of the highest version of the protocol * that is allowed (ie RSN over WPA). */ if (rsnie != NULL && (ic->ic_rsnprotos & IEEE80211_PROTO_RSN)) { status = ieee80211_parse_rsn(ic, rsnie, &rsn); if (status != 0) goto end; ni->ni_rsnprotos = IEEE80211_PROTO_RSN; saveie = rsnie; } else if (wpaie != NULL && (ic->ic_rsnprotos & IEEE80211_PROTO_WPA)) { status = ieee80211_parse_wpa(ic, wpaie, &rsn); if (status != 0) goto end; ni->ni_rsnprotos = IEEE80211_PROTO_WPA; saveie = wpaie; } else { /* * In an RSN, an AP shall not associate with STAs * that fail to include the RSN IE in the * (Re)Association Request. */ status = IEEE80211_STATUS_IE_INVALID; goto end; } /* * The initiating STA's RSN IE shall include one authentication * and pairwise cipher suite among those advertised by the * targeted AP. It shall also specify the group cipher suite * specified by the targeted AP. */ if (rsn.rsn_nakms != 1 || !(rsn.rsn_akms & ic->ic_bss->ni_rsnakms)) { status = IEEE80211_STATUS_BAD_AKMP; goto end; } if (rsn.rsn_nciphers != 1 || !(rsn.rsn_ciphers & ic->ic_bss->ni_rsnciphers)) { status = IEEE80211_STATUS_BAD_PAIRWISE_CIPHER; goto end; } if (rsn.rsn_groupcipher != ic->ic_bss->ni_rsngroupcipher) { status = IEEE80211_STATUS_BAD_GROUP_CIPHER; goto end; } if (!(rsn.rsn_caps & IEEE80211_RSNCAP_MFPC) && (ic->ic_bss->ni_rsncaps & IEEE80211_RSNCAP_MFPR)) { status = IEEE80211_REASON_MFP_POLICY; /* XXX */ goto end; } if ((ic->ic_bss->ni_rsncaps & IEEE80211_RSNCAP_MFPC) && (rsn.rsn_caps & (IEEE80211_RSNCAP_MFPC | IEEE80211_RSNCAP_MFPR)) == IEEE80211_RSNCAP_MFPR) { /* STA advertises an invalid setting */ status = IEEE80211_REASON_MFP_POLICY; /* XXX */ goto end; } if ((rsn.rsn_caps & IEEE80211_RSNCAP_MFPC) && rsn.rsn_groupmgmtcipher != ic->ic_bss->ni_rsngroupmgmtcipher) { /* XXX satus not reason?! */ status = IEEE80211_REASON_BAD_GROUP_MGMT_CIPHER; goto end; } /* * Disallow new associations using TKIP if countermeasures * are active. */ if ((ic->ic_flags & IEEE80211_F_COUNTERM) && (rsn.rsn_ciphers == IEEE80211_CIPHER_TKIP || rsn.rsn_groupcipher == IEEE80211_CIPHER_TKIP)) { status = IEEE80211_STATUS_CIPHER_REJ_POLICY; goto end; } /* everything looks fine, save IE and parameters */ if (ieee80211_save_ie(saveie, &ni->ni_rsnie) != 0) { status = IEEE80211_STATUS_TOOMANY; goto end; } ni->ni_rsnakms = rsn.rsn_akms; ni->ni_rsnciphers = rsn.rsn_ciphers; ni->ni_rsngroupcipher = ic->ic_bss->ni_rsngroupcipher; ni->ni_rsngroupmgmtcipher = ic->ic_bss->ni_rsngroupmgmtcipher; ni->ni_rsncaps = rsn.rsn_caps; } else ni->ni_rsnprotos = IEEE80211_PROTO_NONE; ni->ni_rssi = rxi->rxi_rssi; ni->ni_rstamp = rxi->rxi_tstamp; 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; end: resp = reassoc ? IEEE80211_FC0_SUBTYPE_REASSOC_RESP : IEEE80211_FC0_SUBTYPE_ASSOC_RESP; if (status != 0) { IEEE80211_SEND_MGMT(ic, ni, resp, status); ieee80211_node_leave(ic, ni); } else ieee80211_node_join(ic, ni, resp); } /*- * (Re)Association response frame format: * [2] Capability information * [2] Status code * [2] Association ID (AID) * [tlv] Supported rates * [tlv] Extended Supported Rates (802.11g) * [tlv] EDCA Parameter Set (802.11e) */ void ieee80211_recv_assoc_resp(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, int reassoc) { struct ifnet *ifp = &ic->ic_if; const struct ieee80211_frame *wh; const u_int8_t *frm, *efrm; const u_int8_t *rates, *xrates, *edcaie, *wmmie; u_int16_t capinfo, status, associd; u_int8_t rate; if (ic->ic_opmode != IEEE80211_M_STA || ic->ic_state != IEEE80211_S_ASSOC) { ic->ic_stats.is_rx_mgtdiscard++; return; } /* make sure all mandatory fixed fields are present */ if (m0->m_len < sizeof(*wh) + 6) { DPRINTF(("frame too short\n")); return; } wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; efrm = mtod(m0, u_int8_t *) + m0->m_len; capinfo = LE_READ_2(frm); frm += 2; status = LE_READ_2(frm); frm += 2; if (status != IEEE80211_STATUS_SUCCESS) { if (ifp->if_flags & IFF_DEBUG) printf("%s: %sassociation failed (reason %d)" " for %s\n", ifp->if_xname, reassoc ? "re" : "", status, ether_sprintf((u_int8_t *)wh->i_addr3)); if (ni != ic->ic_bss) ni->ni_fails++; ic->ic_stats.is_rx_auth_fail++; return; } associd = LE_READ_2(frm); frm += 2; rates = xrates = edcaie = wmmie = NULL; while (frm + 2 <= efrm) { if (frm + 2 + frm[1] > efrm) { ic->ic_stats.is_rx_elem_toosmall++; break; } switch (frm[0]) { case IEEE80211_ELEMID_RATES: rates = frm; break; case IEEE80211_ELEMID_XRATES: xrates = frm; break; case IEEE80211_ELEMID_EDCAPARMS: edcaie = frm; break; case IEEE80211_ELEMID_VENDOR: if (frm[1] < 4) { ic->ic_stats.is_rx_elem_toosmall++; break; } if (memcmp(frm + 2, MICROSOFT_OUI, 3) == 0) { if (frm[1] >= 5 && frm[5] == 2 && frm[6] == 1) wmmie = frm; } break; } frm += 2 + frm[1]; } /* supported rates element is mandatory */ if (rates == NULL || rates[1] > IEEE80211_RATE_MAXSIZE) { DPRINTF(("invalid supported rates element\n")); return; } 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) { DPRINTF(("rate mismatch for %s\n", ether_sprintf((u_int8_t *)wh->i_addr2))); ic->ic_stats.is_rx_assoc_norate++; return; } ni->ni_capinfo = capinfo; ni->ni_associd = associd; if (edcaie != NULL || wmmie != NULL) { /* force update of EDCA parameters */ ic->ic_edca_updtcount = -1; if ((edcaie != NULL && ieee80211_parse_edca_params(ic, edcaie) == 0) || (wmmie != NULL && ieee80211_parse_wmm_params(ic, wmmie) == 0)) ni->ni_flags |= IEEE80211_NODE_QOS; else /* for Reassociation */ ni->ni_flags &= ~IEEE80211_NODE_QOS; } /* * Configure state now that we are associated. */ if (ic->ic_curmode == IEEE80211_MODE_11A || (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE)) ic->ic_flags |= IEEE80211_F_SHPREAMBLE; else ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE; ieee80211_set_shortslottime(ic, ic->ic_curmode == IEEE80211_MODE_11A || (ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)); /* * Honor ERP protection. */ if (ic->ic_curmode == IEEE80211_MODE_11G && (ni->ni_erp & IEEE80211_ERP_USE_PROTECTION)) ic->ic_flags |= IEEE80211_F_USEPROT; else ic->ic_flags &= ~IEEE80211_F_USEPROT; /* * If not an RSNA, mark the port as valid, otherwise wait for * 802.1X authentication and 4-way handshake to complete.. */ if (ic->ic_flags & IEEE80211_F_RSNON) { /* XXX ic->ic_mgt_timer = 5; */ } else if (ic->ic_flags & IEEE80211_F_WEPON) ni->ni_flags |= IEEE80211_NODE_TXRXPROT; ieee80211_new_state(ic, IEEE80211_S_RUN, IEEE80211_FC0_SUBTYPE_ASSOC_RESP); } /*- * Deauthentication frame format: * [2] Reason code */ void ieee80211_recv_deauth(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni) { struct ifnet *ifp = &ic->ic_if; const struct ieee80211_frame *wh; const u_int8_t *frm; u_int16_t reason; /* make sure all mandatory fixed fields are present */ if (m0->m_len < sizeof(*wh) + 2) { DPRINTF(("frame too short\n")); return; } wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; reason = LE_READ_2(frm); ic->ic_stats.is_rx_deauth++; switch (ic->ic_opmode) { case IEEE80211_M_STA: ieee80211_new_state(ic, IEEE80211_S_AUTH, IEEE80211_FC0_SUBTYPE_DEAUTH); break; case IEEE80211_M_HOSTAP: if (ni != ic->ic_bss) { if (ifp->if_flags & IFF_DEBUG) printf("%s: station %s deauthenticated " "by peer (reason %d)\n", ifp->if_xname, ether_sprintf(ni->ni_macaddr), reason); ieee80211_node_leave(ic, ni); } break; default: break; } } /*- * Disassociation frame format: * [2] Reason code */ void ieee80211_recv_disassoc(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni) { struct ifnet *ifp = &ic->ic_if; const struct ieee80211_frame *wh; const u_int8_t *frm; u_int16_t reason; /* make sure all mandatory fixed fields are present */ if (m0->m_len < sizeof(*wh) + 2) { DPRINTF(("frame too short\n")); return; } wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; reason = LE_READ_2(frm); ic->ic_stats.is_rx_disassoc++; switch (ic->ic_opmode) { case IEEE80211_M_STA: ieee80211_new_state(ic, IEEE80211_S_ASSOC, IEEE80211_FC0_SUBTYPE_DISASSOC); break; case IEEE80211_M_HOSTAP: if (ni != ic->ic_bss) { if (ifp->if_flags & IFF_DEBUG) printf("%s: station %s disassociated " "by peer (reason %d)\n", ifp->if_xname, ether_sprintf(ni->ni_macaddr), reason); ieee80211_node_leave(ic, ni); } break; default: break; } } /*- * Action frame format: * [1] Category * [1] Action */ void ieee80211_recv_action(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni) { const struct ieee80211_frame *wh; const u_int8_t *frm; if (m0->m_len < sizeof(*wh) + 2) { DPRINTF(("frame too short\n")); return; } wh = mtod(m0, struct ieee80211_frame *); frm = (const u_int8_t *)&wh[1]; switch (frm[0]) { case IEEE80211_CATEG_BA: switch (frm[1]) { case IEEE80211_ACTION_ADDBA_REQ: /* NYI */ break; case IEEE80211_ACTION_ADDBA_RESP: /* NYI */ break; case IEEE80211_ACTION_DELBA: /* NYI */ break; } break; case IEEE80211_CATEG_HT: switch (frm[1]) { case IEEE80211_ACTION_NOTIFYCW: /* NYI */ break; } break; case IEEE80211_CATEG_SALT: switch (frm[1]) { case IEEE80211_ACTION_SALT_REQ: /* NYI */ break; case IEEE80211_ACTION_SALT_RESP: /* NYI */ break; } break; default: DPRINTF(("action frame category %d not handled\n", categ)); break; } } void ieee80211_recv_mgmt(struct ieee80211com *ic, struct mbuf *m0, struct ieee80211_node *ni, struct ieee80211_rxinfo *rxi, int subtype) { switch (subtype) { case IEEE80211_FC0_SUBTYPE_BEACON: ieee80211_recv_probe_resp(ic, m0, ni, rxi, 0); break; case IEEE80211_FC0_SUBTYPE_PROBE_RESP: ieee80211_recv_probe_resp(ic, m0, ni, rxi, 1); break; case IEEE80211_FC0_SUBTYPE_PROBE_REQ: ieee80211_recv_probe_req(ic, m0, ni, rxi); break; case IEEE80211_FC0_SUBTYPE_AUTH: ieee80211_recv_auth(ic, m0, ni, rxi); break; case IEEE80211_FC0_SUBTYPE_ASSOC_REQ: ieee80211_recv_assoc_req(ic, m0, ni, rxi, 0); break; case IEEE80211_FC0_SUBTYPE_REASSOC_REQ: ieee80211_recv_assoc_req(ic, m0, ni, rxi, 1); break; case IEEE80211_FC0_SUBTYPE_ASSOC_RESP: ieee80211_recv_assoc_resp(ic, m0, ni, 0); break; case IEEE80211_FC0_SUBTYPE_REASSOC_RESP: ieee80211_recv_assoc_resp(ic, m0, ni, 1); break; case IEEE80211_FC0_SUBTYPE_DEAUTH: ieee80211_recv_deauth(ic, m0, ni); break; case IEEE80211_FC0_SUBTYPE_DISASSOC: ieee80211_recv_disassoc(ic, m0, ni); break; case IEEE80211_FC0_SUBTYPE_ACTION: ieee80211_recv_action(ic, m0, ni); break; default: DPRINTF(("mgmt frame with subtype 0x%x not handled\n", subtype)); ic->ic_stats.is_rx_badsubtype++; break; } } /* * Process an incoming PS-Poll control frame (see 11.2). */ void ieee80211_recv_pspoll(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni) { struct ifnet *ifp = &ic->ic_if; struct ieee80211_frame_pspoll *psp; struct ieee80211_frame *wh; u_int16_t aid; if (!(ic->ic_caps & IEEE80211_C_PMGT) || ic->ic_opmode != IEEE80211_M_HOSTAP || ni->ni_state != IEEE80211_STA_ASSOC) return; if (m->m_len < sizeof(*psp)) { DPRINTF(("frame too short, len %u\n", m->m_len)); ic->ic_stats.is_rx_tooshort++; return; } psp = mtod(m, struct ieee80211_frame_pspoll *); if (!IEEE80211_ADDR_EQ(psp->i_bssid, ic->ic_bss->ni_bssid)) { DPRINTF(("discard pspoll frame to BSS %s\n", ether_sprintf(psp->i_bssid))); ic->ic_stats.is_rx_wrongbss++; return; } aid = letoh16(*(u_int16_t *)psp->i_aid); if (aid != ni->ni_associd) { DPRINTF(("invalid pspoll aid %x from %s\n", aid, ether_sprintf(psp->i_ta))); return; } /* take the first queued frame and put it out.. */ IF_DEQUEUE(&ni->ni_savedq, m); if (m == NULL) return; if (IF_IS_EMPTY(&ni->ni_savedq)) { /* last queued frame, turn off the TIM bit */ (*ic->ic_set_tim)(ic, ni->ni_associd, 0); } else { /* more queued frames, set the more data bit */ wh = mtod(m, struct ieee80211_frame *); wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA; } IF_ENQUEUE(&ic->ic_pwrsaveq, m); (*ifp->if_start)(ifp); }