/* * Copyright (c) 2001 Atsushi Onoe * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * Alternatively, this software may be distributed under the terms of the * GNU General Public License ("GPL") version 2 as published by the Free * Software Foundation. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * * $FreeBSD: src/sys/net80211/ieee80211_proto.c,v 1.8 2004/04/02 20:22:25 sam Exp $ * $DragonFly: src/sys/netproto/802_11/Attic/ieee80211_proto.c,v 1.1 2004/07/26 16:30:17 joerg Exp $ */ /* * IEEE 802.11 protocol support. */ #include "opt_inet.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET #include #include #endif #define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2) const char *ieee80211_mgt_subtype_name[] = { "assoc_req", "assoc_resp", "reassoc_req", "reassoc_resp", "probe_req", "probe_resp", "reserved#6", "reserved#7", "beacon", "atim", "disassoc", "auth", "deauth", "reserved#13", "reserved#14", "reserved#15" }; const char *ieee80211_state_name[IEEE80211_S_MAX] = { "INIT", /* IEEE80211_S_INIT */ "SCAN", /* IEEE80211_S_SCAN */ "AUTH", /* IEEE80211_S_AUTH */ "ASSOC", /* IEEE80211_S_ASSOC */ "RUN" /* IEEE80211_S_RUN */ }; static int ieee80211_newstate(struct ieee80211com *, enum ieee80211_state, int); void ieee80211_proto_attach(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; ifp->if_hdrlen = sizeof(struct ieee80211_frame); #ifdef notdef ic->ic_rtsthreshold = IEEE80211_RTS_DEFAULT; #else ic->ic_rtsthreshold = IEEE80211_RTS_MAX; #endif ic->ic_fragthreshold = 2346; /* XXX not used yet */ ic->ic_fixed_rate = -1; /* no fixed rate */ ic->ic_protmode = IEEE80211_PROT_CTSONLY; /* protocol state change handler */ ic->ic_newstate = ieee80211_newstate; /* initialize management frame handlers */ ic->ic_recv_mgmt = ieee80211_recv_mgmt; ic->ic_send_mgmt = ieee80211_send_mgmt; } void ieee80211_proto_detach(struct ifnet *ifp) { struct ieee80211com *ic = (void *)ifp; IF_DRAIN(&ic->ic_mgtq); } void ieee80211_print_essid(uint8_t *essid, int len) { int i; uint8_t *p; if (len > IEEE80211_NWID_LEN) len = IEEE80211_NWID_LEN; /* determine printable or not */ for (i = 0, p = essid; i < len; i++, p++) { if (*p < ' ' || *p > 0x7e) break; } if (i == len) { printf("\""); for (i = 0, p = essid; i < len; i++, p++) printf("%c", *p); printf("\""); } else { printf("0x"); for (i = 0, p = essid; i < len; i++, p++) printf("%02x", *p); } } void ieee80211_dump_pkt(uint8_t *buf, int len, int rate, int rssi) { struct ieee80211_frame *wh; int i; wh = (struct ieee80211_frame *)buf; switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) { case IEEE80211_FC1_DIR_NODS: printf("NODS %6D->%6D(%6D)", wh->i_addr2, ":", wh->i_addr1, ":", wh->i_addr3, ":"); break; case IEEE80211_FC1_DIR_TODS: printf("TODS %6D->%6D(%6D)", wh->i_addr2, ":", wh->i_addr3, ":", wh->i_addr1, ":"); break; case IEEE80211_FC1_DIR_FROMDS: printf("FRDS %6D->%6D(%6D)", wh->i_addr3, ":", wh->i_addr1, ":", wh->i_addr2, ":"); break; case IEEE80211_FC1_DIR_DSTODS: printf("DSDS %6D->%6D(%6D->%6D)", (uint8_t *)&wh[1], ":", wh->i_addr3, ":", wh->i_addr2, ":", wh->i_addr1, ":"); break; } switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) { case IEEE80211_FC0_TYPE_DATA: printf(" data"); break; case IEEE80211_FC0_TYPE_MGT: printf(" %s", ieee80211_mgt_subtype_name[ (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) >> IEEE80211_FC0_SUBTYPE_SHIFT]); break; default: printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK); break; } if (wh->i_fc[1] & IEEE80211_FC1_WEP) printf(" WEP"); if (rate >= 0) printf(" %dM", rate / 2); if (rssi >= 0) printf(" +%d", rssi); printf("\n"); if (len > 0) { for (i = 0; i < len; i++) { if ((i & 1) == 0) printf(" "); printf("%02x", buf[i]); } printf("\n"); } } int ieee80211_fix_rate(struct ieee80211com *ic, struct ieee80211_node *ni, int flags) { #define RV(v) ((v) & IEEE80211_RATE_VAL) int i, j, ignore, error; int okrate, badrate; struct ieee80211_rateset *srs, *nrs; uint8_t r; error = 0; okrate = badrate = 0; srs = &ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)]; nrs = &ni->ni_rates; for (i = 0; i < nrs->rs_nrates; ) { ignore = 0; if (flags & IEEE80211_F_DOSORT) { /* * Sort rates. */ for (j = i + 1; j < nrs->rs_nrates; j++) { if (RV(nrs->rs_rates[i]) > RV(nrs->rs_rates[j])) { r = nrs->rs_rates[i]; nrs->rs_rates[i] = nrs->rs_rates[j]; nrs->rs_rates[j] = r; } } } r = nrs->rs_rates[i] & IEEE80211_RATE_VAL; badrate = r; if (flags & IEEE80211_F_DOFRATE) { /* * Apply fixed rate constraint. Note that we do * not apply the constraint to basic rates as * otherwise we may not be able to associate if * the rate set we submit to the AP is invalid * (e.g. fix rate at 36Mb/s which is not a basic * rate for 11a operation). */ if ((nrs->rs_rates[i] & IEEE80211_RATE_BASIC) == 0 && ic->ic_fixed_rate >= 0 && r != RV(srs->rs_rates[ic->ic_fixed_rate])) ignore++; } if (flags & IEEE80211_F_DONEGO) { /* * Check against supported rates. */ for (j = 0; j < srs->rs_nrates; j++) { if (r == RV(srs->rs_rates[j])) { /* * Overwrite with the supported rate * value so any basic rate bit is set. * This insures that response we send * to stations have the necessary basic * rate bit set. */ nrs->rs_rates[i] = srs->rs_rates[j]; break; } } if (j == srs->rs_nrates) { /* * A rate in the node's rate set is not * supported. If this is a basic rate and we * are operating as an AP then this is an error. * Otherwise we just discard/ignore the rate. * Note that this is important for 11b stations * when they want to associate with an 11g AP. */ if (ic->ic_opmode == IEEE80211_M_HOSTAP && (nrs->rs_rates[i] & IEEE80211_RATE_BASIC)) error++; ignore++; } } if (flags & IEEE80211_F_DODEL) { /* * Delete unacceptable rates. */ if (ignore) { nrs->rs_nrates--; for (j = i; j < nrs->rs_nrates; j++) nrs->rs_rates[j] = nrs->rs_rates[j + 1]; nrs->rs_rates[j] = 0; continue; } } if (!ignore) okrate = nrs->rs_rates[i]; i++; } if (okrate == 0 || error != 0) return badrate | IEEE80211_RATE_BASIC; else return RV(okrate); #undef RV } static int ieee80211_newstate(struct ieee80211com *ic, enum ieee80211_state nstate, int mgt) { struct ifnet *ifp = &ic->ic_if; struct ieee80211_node *ni; enum ieee80211_state ostate; struct lwkt_tokref ilock; ostate = ic->ic_state; IEEE80211_DPRINTF(("%s: %s -> %s\n", __func__, ieee80211_state_name[ostate], ieee80211_state_name[nstate])); ic->ic_state = nstate; /* state transition */ ni = ic->ic_bss; /* NB: no reference held */ switch (nstate) { case IEEE80211_S_INIT: switch (ostate) { case IEEE80211_S_INIT: break; case IEEE80211_S_RUN: switch (ic->ic_opmode) { case IEEE80211_M_STA: IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DISASSOC, IEEE80211_REASON_ASSOC_LEAVE); break; case IEEE80211_M_HOSTAP: lwkt_gettoken(&ilock, &ic->ic_nodetoken); TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { if (ni->ni_associd == 0) continue; IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DISASSOC, IEEE80211_REASON_ASSOC_LEAVE); } lwkt_reltoken(&ilock); break; default: break; } /* FALLTHRU */ case IEEE80211_S_ASSOC: switch (ic->ic_opmode) { case IEEE80211_M_STA: IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_AUTH_LEAVE); break; case IEEE80211_M_HOSTAP: lwkt_gettoken(&ilock, &ic->ic_nodetoken); TAILQ_FOREACH(ni, &ic->ic_node, ni_list) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_DEAUTH, IEEE80211_REASON_AUTH_LEAVE); } lwkt_reltoken(&ilock); break; default: break; } /* FALLTHRU */ case IEEE80211_S_AUTH: case IEEE80211_S_SCAN: ic->ic_mgt_timer = 0; IF_DRAIN(&ic->ic_mgtq); if (ic->ic_wep_ctx != NULL) { free(ic->ic_wep_ctx, M_DEVBUF); ic->ic_wep_ctx = NULL; } ieee80211_free_allnodes(ic); break; } break; case IEEE80211_S_SCAN: ic->ic_flags &= ~IEEE80211_F_SIBSS; /* initialize bss for probe request */ IEEE80211_ADDR_COPY(ni->ni_macaddr, ifp->if_broadcastaddr); IEEE80211_ADDR_COPY(ni->ni_bssid, ifp->if_broadcastaddr); ni->ni_rates = ic->ic_sup_rates[ ieee80211_chan2mode(ic, ni->ni_chan)]; ni->ni_associd = 0; ni->ni_rstamp = 0; switch (ostate) { case IEEE80211_S_INIT: if (ic->ic_opmode == IEEE80211_M_HOSTAP && ic->ic_des_chan != IEEE80211_CHAN_ANYC) { /* * AP operation and we already have a channel; * bypass the scan and startup immediately. */ ieee80211_create_ibss(ic, ic->ic_des_chan); } else { ieee80211_begin_scan(ifp); } break; case IEEE80211_S_SCAN: /* scan next */ if (ic->ic_flags & IEEE80211_F_ASCAN) { IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_PROBE_REQ, 0); } break; case IEEE80211_S_RUN: /* beacon miss */ if (ifp->if_flags & IFF_DEBUG) { /* XXX bssid clobbered above */ if_printf(ifp, "no recent beacons from %6D;" " rescanning\n", ic->ic_bss->ni_bssid, ":"); } ieee80211_free_allnodes(ic); /* FALLTHRU */ case IEEE80211_S_AUTH: case IEEE80211_S_ASSOC: /* timeout restart scan */ ni = ieee80211_find_node(ic, ic->ic_bss->ni_macaddr); if (ni != NULL) { ni->ni_fails++; ieee80211_unref_node(&ni); } ieee80211_begin_scan(ifp); break; } break; case IEEE80211_S_AUTH: switch (ostate) { case IEEE80211_S_INIT: IEEE80211_DPRINTF(("%s: invalid transition\n", __func__)); break; case IEEE80211_S_SCAN: IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); break; case IEEE80211_S_AUTH: case IEEE80211_S_ASSOC: switch (mgt) { case IEEE80211_FC0_SUBTYPE_AUTH: /* ??? */ IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, 2); break; case IEEE80211_FC0_SUBTYPE_DEAUTH: /* ignore and retry scan on timeout */ break; } break; case IEEE80211_S_RUN: switch (mgt) { case IEEE80211_FC0_SUBTYPE_AUTH: IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, 2); ic->ic_state = ostate; /* stay RUN */ break; case IEEE80211_FC0_SUBTYPE_DEAUTH: /* try to reauth */ IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_AUTH, 1); break; } break; } break; case IEEE80211_S_ASSOC: switch (ostate) { case IEEE80211_S_INIT: case IEEE80211_S_SCAN: case IEEE80211_S_ASSOC: IEEE80211_DPRINTF(("%s: invalid transition\n", __func__)); break; case IEEE80211_S_AUTH: IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 0); break; case IEEE80211_S_RUN: IEEE80211_SEND_MGMT(ic, ni, IEEE80211_FC0_SUBTYPE_ASSOC_REQ, 1); break; } break; case IEEE80211_S_RUN: switch (ostate) { case IEEE80211_S_INIT: case IEEE80211_S_AUTH: case IEEE80211_S_RUN: IEEE80211_DPRINTF(("%s: invalid transition\n", __func__)); break; case IEEE80211_S_SCAN: /* adhoc/hostap mode */ case IEEE80211_S_ASSOC: /* infra mode */ KASSERT(ni->ni_txrate < ni->ni_rates.rs_nrates, ("%s: bogus xmit rate %u setup\n", __func__, ni->ni_txrate)); if (ifp->if_flags & IFF_DEBUG) { if_printf(ifp, " "); if (ic->ic_opmode == IEEE80211_M_STA) printf("associated "); else printf("synchronized "); printf("with %6D ssid ", ni->ni_bssid, ":"); ieee80211_print_essid(ic->ic_bss->ni_essid, ni->ni_esslen); printf(" channel %d start %uMb\n", ieee80211_chan2ieee(ic, ni->ni_chan), IEEE80211_RATE2MBS(ni->ni_rates.rs_rates[ni->ni_txrate])); } ic->ic_mgt_timer = 0; (*ifp->if_start)(ifp); break; } break; } return 0; }