diff options
Diffstat (limited to 'contrib/tcpdump/print-802_11.c')
-rw-r--r-- | contrib/tcpdump/print-802_11.c | 858 |
1 files changed, 858 insertions, 0 deletions
diff --git a/contrib/tcpdump/print-802_11.c b/contrib/tcpdump/print-802_11.c new file mode 100644 index 0000000..b9c2bb8 --- /dev/null +++ b/contrib/tcpdump/print-802_11.c @@ -0,0 +1,858 @@ +/* + * Copyright (c) 2001 + * Fortress Technologies, Inc. All rights reserved. + * Charlie Lenahan (clenahan@fortresstech.com) + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that: (1) source code distributions + * retain the above copyright notice and this paragraph in its entirety, (2) + * distributions including binary code include the above copyright notice and + * this paragraph in its entirety in the documentation or other materials + * provided with the distribution, and (3) all advertising materials mentioning + * features or use of this software display the following acknowledgement: + * ``This product includes software developed by the University of California, + * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of + * the University nor the names of its contributors may be used to endorse + * or promote products derived from this software without specific prior + * written permission. + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. + */ + +#ifndef lint +static const char rcsid[] = + "@(#) $Header: /tcpdump/master/tcpdump/print-802_11.c,v 1.6 2001/09/17 21:57:53 fenner Exp $ (LBL)"; +#endif + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <sys/param.h> +#include <sys/time.h> +#include <sys/socket.h> + +#include <netinet/in.h> + +#include <stdio.h> +#include <pcap.h> +#include <string.h> + +#include "interface.h" +#include "addrtoname.h" +#include "ethertype.h" + +#include "extract.h" + +#include "ieee802_11.h" + +#define RATEStoBUF(p, buf) \ +do { \ + int z = 0; \ + for (z = 0 ; z < p.rates.length ; z++) \ + snprintf(buf, sizeof(buf), "%s %2.1f", buf, (.5 * (p.rates.rate[z] & 0x7f))); \ +} while (0) + +static const char *auth_alg_text[]={"Open System","Shared Key","EAP"}; +static const char *subtype_text[]={ + "Assoc Request", + "Assoc Response", + "ReAssoc Request", + "ReAssoc Response", + "Probe Request", + "Probe Response", + "RESERVED", + "RESERVED", + "Beacon", + "ATIM", + "Disassociation", + "Authentication", + "DeAuthentication", + "RESERVED", + "RESERVED" +}; + +static const char *status_text[] = { + "Succesful", /* 0 */ + "Unspecified failure", /* 1 */ + "Reserved", /* 2 */ + "Reserved", /* 3 */ + "Reserved", /* 4 */ + "Reserved", /* 5 */ + "Reserved", /* 6 */ + "Reserved", /* 7 */ + "Reserved", /* 8 */ + "Reserved", /* 9 */ + "Cannot Support all requested capabilities in the Capability Information field", /* 10 */ + "Reassociation denied due to inability to confirm that association exists", /* 11 */ + "Association denied due to reason outside the scope of the standard", /* 12 */ + "Responding station does not support the specified authentication algorithm ", /* 13 */ + "Received an Authentication frame with authentication transaction " \ + "sequence number out of expected sequence", /* 14 */ + "Authentication rejected because of challenge failure", /* 15 */ + "Authentication rejected due to timeout waiting for next frame in sequence", /* 16 */ + "Association denied because AP is unable to handle additional associated stations", /* 17 */ + "Association denied due to requesting station not supporting all of the " \ + "data rates in BSSBasicRateSet parameter", /* 18 */ + NULL +}; + +static const char *reason_text[] = { + "Reserved", /* 0 */ + "Unspecified reason", /* 1 */ + "Previous authentication no longer valid", /* 2 */ + "Deauthenticated because sending station is leaving (or has left) IBSS or ESS", /* 3 */ + "Disassociated due to inactivity", /* 4 */ + "Disassociated because AP is unable to handle all currently associated stations", /* 5 */ + "Class 2 frame receivedfrom nonauthenticated station", /* 6 */ + "Class 3 frame received from nonassociated station", /* 7 */ + "Disassociated because sending station is leaving (or has left) BSS", /* 8 */ + "Station requesting (re)association is not authenticated with responding station", /* 9 */ + NULL +}; + +static int wep_print(const u_char *p,u_int length) +{ + u_int32_t iv; + + if (!TTEST2(*p, 4)) + return 0; + iv = EXTRACT_LE_32BITS(p); + + printf("Data IV:%3x Pad %x KeyID %x", IV_IV(iv), IV_PAD(iv), + IV_KEYID(iv)); + + return 1; +} + + +static int parse_elements(struct mgmt_body_t *pbody,const u_char *p,int offset) +{ + for (;;) { + if (!TTEST2(*(p + offset), 1)) + return 0; + if (*(p + offset) == 0xff) + break; + switch (*(p + offset)) { + case E_SSID: + if (!TTEST2(*(p+offset), 2)) + return 0; + memcpy(&(pbody->ssid),p+offset,2); offset += 2; + if (pbody->ssid.length > 0) + { + if (!TTEST2(*(p+offset), pbody->ssid.length)) + return 0; + memcpy(&(pbody->ssid.ssid),p+offset,pbody->ssid.length); offset += pbody->ssid.length; + pbody->ssid.ssid[pbody->ssid.length]='\0'; + } + break; + case E_CHALLENGE: + if (!TTEST2(*(p+offset), 2)) + return 0; + memcpy(&(pbody->challenge),p+offset,2); offset += 2; + if (pbody->challenge.length > 0) + { + if (!TTEST2(*(p+offset), pbody->challenge.length)) + return 0; + memcpy(&(pbody->challenge.text),p+offset,pbody->challenge.length); offset += pbody->challenge.length; + pbody->challenge.text[pbody->challenge.length]='\0'; + } + break; + case E_RATES: + if (!TTEST2(*(p+offset), 2)) + return 0; + memcpy(&(pbody->rates),p+offset,2); offset += 2; + if (pbody->rates.length > 0) { + if (!TTEST2(*(p+offset), pbody->rates.length)) + return 0; + memcpy(&(pbody->rates.rate),p+offset,pbody->rates.length); offset += pbody->rates.length; + } + break; + case E_DS: + if (!TTEST2(*(p+offset), 3)) + return 0; + memcpy(&(pbody->ds),p+offset,3); offset +=3; + break; + case E_CF: + if (!TTEST2(*(p+offset), 8)) + return 0; + memcpy(&(pbody->cf),p+offset,8); offset +=8; + break; + case E_TIM: + if (!TTEST2(*(p+offset), 2)) + return 0; + memcpy(&(pbody->tim),p+offset,2); offset +=2; + if (!TTEST2(*(p+offset), 3)) + return 0; + memcpy(&(pbody->tim.count),p+offset,3); offset +=3; + + if ((pbody->tim.length -3) > 0) + { + if (!TTEST2(*(p+offset), pbody->tim.length -3)) + return 0; + memcpy((pbody->tim.bitmap),p+(pbody->tim.length -3),(pbody->tim.length -3)); + offset += pbody->tim.length -3; + } + + break; + default: +#if 0 + printf("(1) unhandled element_id (%d) ", *(p+offset) ); +#endif + offset+= *(p+offset+1) + 2; + break; + } + } + return 1; +} + +/********************************************************************************* + * Print Handle functions for the management frame types + *********************************************************************************/ + +static int handle_beacon(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + char buf[128]; + + memset(buf, 0, sizeof(buf)); + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 12)) + return 0; + memcpy(&pbody.timestamp, p, 8); + offset += 8; + pbody.beacon_interval = EXTRACT_LE_16BITS(p+offset); + offset += 2; + pbody.capability_info = EXTRACT_LE_16BITS(p+offset); + offset += 2; + + if (!parse_elements(&pbody,p,offset)) + return 0; + + RATEStoBUF(pbody, buf); + + printf("%s (%s) [%s Mbit] %s CH: %x %s", + subtype_text[FC_SUBTYPE(fc)], pbody.ssid.ssid, buf, + CAPABILITY_ESS(pbody.capability_info) ? "ESS" : "IBSS", + pbody.ds.channel, + CAPABILITY_PRIVACY(pbody.capability_info) ? ", PRIVACY" : "" ); + + return 1; +} + +static int handle_assoc_request(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + char buf[128]; + + memset(buf, 0, sizeof(buf)); + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 4)) + return 0; + pbody.capability_info = EXTRACT_LE_16BITS(p); + offset += 2; + pbody.listen_interval = EXTRACT_LE_16BITS(p+offset); + offset += 2; + + if (!parse_elements(&pbody,p,offset)) + return 0; + + RATEStoBUF(pbody,buf); + + printf("%s (%s) [%s Mbit] ", + subtype_text[FC_SUBTYPE(fc)], pbody.ssid.ssid,buf); + return 1; +} + +static int handle_assoc_response(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 6)) + return 0; + pbody.capability_info = EXTRACT_LE_16BITS(p); + offset += 2; + pbody.status_code = EXTRACT_LE_16BITS(p+offset); + offset += 2; + pbody.aid = EXTRACT_LE_16BITS(p+offset); + offset += 2; + + if (!parse_elements(&pbody,p,offset)) + return 0; + + printf("%s AID(%x) :%s: %s ", subtype_text[FC_SUBTYPE(fc)], + ((u_int16_t)(pbody.aid << 2 )) >> 2 , + CAPABILITY_PRIVACY(pbody.capability_info) ? " PRIVACY " : "", + (pbody.status_code < 19 ? status_text[pbody.status_code] : "n/a")); + + return 1; +} + + +static int handle_reassoc_request(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 10)) + return 0; + pbody.capability_info = EXTRACT_LE_16BITS(p); + offset += 2; + pbody.listen_interval = EXTRACT_LE_16BITS(p+offset); + offset += 2; + memcpy(&pbody.ap,p+offset,6); + offset += 6; + + if (!parse_elements(&pbody,p,offset)) + return 0; + + printf("%s (%s) AP : %s",subtype_text[FC_SUBTYPE(fc)], pbody.ssid.ssid, etheraddr_string( pbody.ap )); + + return 1; +} + +static int handle_reassoc_response(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + /* Same as a Association Reponse */ + return handle_assoc_response(fc,pmh,p); +} + +static int handle_probe_request(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + char buf[128]; + + memset(buf, 0, sizeof(buf)); + + memset(&pbody, 0, sizeof(pbody)); + + if (!parse_elements(&pbody, p, offset)) + return 0; + + RATEStoBUF(pbody, buf); + + printf("%s (%s) [%s Mbit] ", subtype_text[FC_SUBTYPE(fc)], + pbody.ssid.ssid,buf); + + return 1; +} + +static int handle_probe_response(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + char buf[128]; + + memset(buf, 0, sizeof(buf)); + + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 12)) + return 0; + memcpy(&pbody.timestamp,p,8); + offset += 8; + pbody.beacon_interval = EXTRACT_LE_16BITS(p+offset); + offset += 2; + pbody.capability_info = EXTRACT_LE_16BITS(p+offset); + offset += 2; + + if (!parse_elements(&pbody, p, offset)) + return 0; + + printf("%s (%s) CH: %x %s", subtype_text[FC_SUBTYPE(fc)], pbody.ssid.ssid,pbody.ds.channel, + CAPABILITY_PRIVACY(pbody.capability_info) ? ",PRIVACY " : "" ); + + return 1; +} + +static int handle_atim(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + /* the frame body for ATIM is null. */ + printf("ATIM"); + return 1; +} + +static int handle_disassoc(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 2)) + return 0; + pbody.reason_code = EXTRACT_LE_16BITS(p); + offset += 2; + + printf("%s: %s ", subtype_text[FC_SUBTYPE(fc)], + pbody.reason_code < 10 ? reason_text[pbody.reason_code] : "Reserved" ); + + return 1; +} + +static int handle_auth(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 6)) + return 0; + pbody.auth_alg = EXTRACT_LE_16BITS(p); + offset += 2; + pbody.auth_trans_seq_num = EXTRACT_LE_16BITS(p + offset); + offset += 2; + pbody.status_code = EXTRACT_LE_16BITS(p + offset); + offset += 2; + + if (!parse_elements(&pbody,p,offset)) + return 0; + + if ((pbody.auth_alg == 1) && + ((pbody.auth_trans_seq_num == 2) || (pbody.auth_trans_seq_num == 3))) { + printf("%s (%s)-%x [Challenge Text] %s", + subtype_text[FC_SUBTYPE(fc)], + pbody.auth_alg < 4 ? auth_alg_text[pbody.auth_alg] : "Reserved" , + pbody.auth_trans_seq_num, + ((pbody.auth_trans_seq_num % 2) ? + (pbody.status_code < 19 ? status_text[pbody.status_code] : "n/a") : "" )); + } else { + printf("%s (%s)-%x: %s", + subtype_text[FC_SUBTYPE(fc)], + pbody.auth_alg < 4 ? auth_alg_text[pbody.auth_alg] : "Reserved" , + pbody.auth_trans_seq_num, + ((pbody.auth_trans_seq_num % 2) ? (pbody.status_code < 19 ? status_text[pbody.status_code] : "n/a") : "")); + } + + return 1; +} + +static int handle_deauth(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p) +{ + struct mgmt_body_t pbody; + int offset = 0; + + memset(&pbody, 0, sizeof(pbody)); + + if (!TTEST2(*p, 2)) + return 0; + pbody.reason_code = EXTRACT_LE_16BITS(p); + offset += 2; + + if (eflag) { + printf("%s: %s", + subtype_text[FC_SUBTYPE(fc)], + pbody.reason_code < 10 ? reason_text[pbody.reason_code] : "Reserved" ); + } else { + printf("%s (%s): %s", + subtype_text[FC_SUBTYPE(fc)], etheraddr_string(pmh->sa), + pbody.reason_code < 10 ? reason_text[pbody.reason_code] : "Reserved" ); + } + + return 1; +} + + +/********************************************************************************* + * Print Body funcs + *********************************************************************************/ + + +static int mgmt_body_print(u_int16_t fc, const struct mgmt_header_t *pmh, + const u_char *p, u_int length) +{ + switch (FC_SUBTYPE(fc)) { + case ST_ASSOC_REQUEST: + return (handle_assoc_request(fc, pmh, p)); + case ST_ASSOC_RESPONSE: + return (handle_assoc_response(fc, pmh, p)); + case ST_REASSOC_REQUEST: + return (handle_reassoc_request(fc, pmh, p)); + case ST_REASSOC_RESPONSE: + return (handle_reassoc_response(fc, pmh, p)); + case ST_PROBE_REQUEST: + return (handle_probe_request(fc, pmh, p)); + case ST_PROBE_RESPONSE: + return (handle_probe_response(fc, pmh, p)); + case ST_BEACON: + return (handle_beacon(fc, pmh, p)); + case ST_ATIM: + return (handle_atim(fc, pmh, p)); + case ST_DISASSOC: + return (handle_disassoc(fc, pmh, p)); + case ST_AUTH: + if (!TTEST2(*p, 3)) + return 0; + if ((p[0] == 0 ) && (p[1] == 0) && (p[2] == 0)) { + printf("Authentication (Shared-Key)-3 "); + return (wep_print(p, length)); + } + else + return (handle_auth(fc, pmh, p)); + case ST_DEAUTH: + return (handle_deauth(fc, pmh, p)); + break; + default: + printf("Unhandled Managment subtype(%x)", + FC_SUBTYPE(fc)); + return 1; + } +} + + +/********************************************************************************* + * Handles printing all the control frame types + *********************************************************************************/ + +static int ctrl_body_print(u_int16_t fc,const u_char *p, u_int length) +{ + switch (FC_SUBTYPE(fc)) { + case CTRL_PS_POLL: + if (!TTEST2(*p, CTRL_PS_POLL_LEN)) + return 0; + printf("Power Save-Poll AID(%x)", + EXTRACT_LE_16BITS(&(((const struct ctrl_ps_poll_t *)p)->aid))); + break; + case CTRL_RTS: + if (!TTEST2(*p, CTRL_RTS_LEN)) + return 0; + if (eflag) + printf("Request-To-Send"); + else + printf("Request-To-Send TA:%s ", + etheraddr_string(((const struct ctrl_rts_t *)p)->ta)); + break; + case CTRL_CTS: + if (!TTEST2(*p, CTRL_CTS_LEN)) + return 0; + if (eflag) + printf("Clear-To-Send"); + else + printf("Clear-To-Send RA:%s ", + etheraddr_string(((const struct ctrl_cts_t *)p)->ra)); + break; + case CTRL_ACK: + if (!TTEST2(*p, CTRL_ACK_LEN)) + return 0; + if (eflag) + printf("Acknowledgment"); + else + printf("Acknowledgment RA:%s ", + etheraddr_string(((const struct ctrl_ack_t *)p)->ra)); + break; + case CTRL_CF_END: + if (!TTEST2(*p, CTRL_END_LEN)) + return 0; + if (eflag) + printf("CF-End"); + else + printf("CF-End RA:%s ", + etheraddr_string(((const struct ctrl_end_t *)p)->ra)); + break; + case CTRL_END_ACK: + if (!TTEST2(*p, CTRL_END_ACK_LEN)) + return 0; + if (eflag) + printf("CF-End+CF-Ack"); + else + printf("CF-End+CF-Ack RA:%s ", + etheraddr_string(((const struct ctrl_end_ack_t *)p)->ra)); + break; + default: + printf("(B) Unknown Ctrl Subtype"); + } + return 1; +} + + + +/* + * Print Header funcs + */ + +/* + * Data Frame - Address field contents + * + * To Ds | From DS | Addr 1 | Addr 2 | Addr 3 | Addr 4 + * 0 | 0 | DA | SA | BSSID | n/a + * 0 | 1 | DA | BSSID | SA | n/a + * 1 | 0 | BSSID | SA | DA | n/a + * 1 | 1 | RA | TA | DA | SA + */ + +static void data_header_print(u_int16_t fc,const u_char *p, u_int length) +{ +#define ADDR1 (p + 4) +#define ADDR2 (p + 10) +#define ADDR3 (p + 16) +#define ADDR4 (p + 24) + + if (!FC_TO_DS(fc)) { + if (!FC_FROM_DS(fc)) + printf("DA:%s SA:%s BSSID:%s ", + etheraddr_string(ADDR1), etheraddr_string(ADDR2), + etheraddr_string(ADDR3)); + else + printf("DA:%s BSSID:%s SA:%s ", + etheraddr_string(ADDR1), etheraddr_string(ADDR2), + etheraddr_string(ADDR3)); + } else { + if (!FC_FROM_DS(fc)) + printf("BSSID:%s SA:%s DA:%s ", + etheraddr_string(ADDR1), etheraddr_string(ADDR2), + etheraddr_string(ADDR3)); + else + printf("RA:%s TA:%s DA:%s SA:%s ", + etheraddr_string(ADDR1), etheraddr_string(ADDR2), + etheraddr_string(ADDR3), etheraddr_string(ADDR4)); + } + +#undef ADDR1 +#undef ADDR2 +#undef ADDR3 +#undef ADDR4 +} + + +static void mgmt_header_print(const u_char *p, u_int length) +{ + const struct mgmt_header_t *hp = (const struct mgmt_header_t *) p; + + printf("BSSID:%s DA:%s SA:%s ", + etheraddr_string((hp)->bssid), etheraddr_string((hp)->da), + etheraddr_string((hp)->sa)); +} + +static void ctrl_header_print(u_int16_t fc,const u_char *p, u_int length) +{ + switch (FC_SUBTYPE(fc)) { + case CTRL_PS_POLL: + printf("BSSID:%s TA:%s ", + etheraddr_string(((const struct ctrl_ps_poll_t *)p)->bssid), + etheraddr_string(((const struct ctrl_ps_poll_t *)p)->ta)); + break; + case CTRL_RTS: + printf("RA:%s TA:%s ", + etheraddr_string(((const struct ctrl_rts_t *)p)->ra), + etheraddr_string(((const struct ctrl_rts_t *)p)->ta)); + break; + case CTRL_CTS: + printf("RA:%s ", + etheraddr_string(((const struct ctrl_cts_t *)p)->ra)); + break; + case CTRL_ACK: + printf("RA:%s ", + etheraddr_string(((const struct ctrl_ack_t *)p)->ra)); + break; + case CTRL_CF_END: + printf("RA:%s BSSID:%s ", + etheraddr_string(((const struct ctrl_end_t *)p)->ra), + etheraddr_string(((const struct ctrl_end_t *)p)->bssid)); + break; + case CTRL_END_ACK: + printf("RA:%s BSSID:%s ", + etheraddr_string(((const struct ctrl_end_ack_t *)p)->ra), + etheraddr_string(((const struct ctrl_end_ack_t *)p)->bssid)); + break; + default: + printf("(H) Unknown Ctrl Subtype"); + } +} + +static int GetHeaderLength(u_int16_t fc) +{ + int iLength=0; + + switch (FC_TYPE(fc)) { + case T_MGMT: + iLength = MGMT_HEADER_LEN; + break; + case T_CTRL: + switch (FC_SUBTYPE(fc)) { + case CTRL_PS_POLL: + iLength = CTRL_PS_POLL_LEN; + break; + case CTRL_RTS: + iLength = CTRL_RTS_LEN; + break; + case CTRL_CTS: + iLength = CTRL_CTS_LEN; + break; + case CTRL_ACK: + iLength = CTRL_ACK_LEN; + break; + case CTRL_CF_END: + iLength = CTRL_END_LEN; + break; + case CTRL_END_ACK: + iLength = CTRL_END_ACK_LEN; + break; + default: + iLength = 0; + break; + } + break; + case T_DATA: + if (FC_TO_DS(fc) && FC_FROM_DS(fc)) + iLength = 30; + else + iLength = 24; + break; + default: + printf("unknown IEEE802.11 frame type (%d)", + FC_TYPE(fc)); + break; + } + + return iLength; +} + +/* + * Print the 802.11 MAC header + */ +static inline void +ieee_802_11_print(u_int16_t fc, const u_char *p, u_int length) +{ + switch (FC_TYPE(fc)) { + case T_MGMT: + mgmt_header_print(p, length); + break; + + case T_CTRL: + ctrl_header_print(fc, p, length); + break; + + case T_DATA: + data_header_print(fc, p, length); + break; + + default: + printf("(header) unknown IEEE802.11 frame type (%d)", + FC_TYPE(fc)); + break; + } +} + +/* + * This is the top level routine of the printer. 'p' is the points + * to the ether header of the packet, 'h->tv' is the timestamp, + * 'h->length' is the length of the packet off the wire, and 'h->caplen' + * is the number of bytes actually captured. + */ +void +ieee802_11_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) +{ + u_int caplen = h->caplen; + u_int length = h->len; + u_int16_t fc; + u_int HEADER_LENGTH; + u_short extracted_ethertype; + + ++infodelay; + ts_print(&h->ts); + + if (caplen < IEEE802_11_FC_LEN) { + printf("[|802.11]"); + goto out; + } + + fc=EXTRACT_LE_16BITS(p); + + if (eflag) + ieee_802_11_print(fc, p, length); + + /* + * Some printers want to get back at the ethernet addresses, + * and/or check that they're not walking off the end of the packet. + * Rather than pass them all the way down, we set these globals. + */ + packetp = p; + snapend = p + caplen; + + HEADER_LENGTH=GetHeaderLength(fc); + + length -= HEADER_LENGTH; + caplen -= HEADER_LENGTH; + p += HEADER_LENGTH; + + switch (FC_TYPE(fc)) { + case T_MGMT: + if (!mgmt_body_print(fc, (const struct mgmt_header_t *)packetp, + p, length)) { + printf("[|802.11]"); + goto out; + } + break; + + case T_CTRL: + if (!ctrl_body_print(fc, p - HEADER_LENGTH, + length + HEADER_LENGTH)) { + printf("[|802.11]"); + goto out; + } + break; + + case T_DATA: + /* There may be a problem w/ AP not having this bit set */ + if (FC_WEP(fc)) { + if (!wep_print(p,length)) { + printf("[|802.11]"); + goto out; + } + } else { + if (llc_print(p, length, caplen, packetp + 10, + packetp + 4, &extracted_ethertype) == 0) { + /* + * Some kinds of LLC packet we cannot + * handle intelligently + */ + if (!eflag) + ieee_802_11_print(fc, p - HEADER_LENGTH, + length + HEADER_LENGTH); + if (extracted_ethertype) { + printf("(LLC %s) ", + etherproto_string(htons(extracted_ethertype))); + } + if (!xflag && !qflag) + default_print(p, caplen); + } + } + break; + + default: + printf("(body) unhandled IEEE802.11 frame type (%d)", + FC_TYPE(fc)); + break; + } + + if (xflag) + default_print(p, caplen); + out: + putchar('\n'); + --infodelay; + if (infoprint) + info(0); +} |