diff options
| author | Guy Harris <guy@alum.mit.edu> | 2003-09-24 23:35:39 +0000 |
|---|---|---|
| committer | Guy Harris <guy@alum.mit.edu> | 2003-09-24 23:35:39 +0000 |
| commit | 54b276060b40391964aabd842aeed27f446d83a5 (patch) | |
| tree | 7d8c7f8e961fd3960289ed388c900cf00cf32e6e /packet-lwapp.c | |
| parent | 30265de991173a8dc351ca770018721e2a27d19a (diff) | |
From David Frascone: have an 802.11 dissector that byte-swaps the frame
control field, and have a preference in the LWAPP dissector to specify
whether to use it or the regular 802.11 dissector, as some hardware
sends out LWAPP-encapsulated 802.11 packets with a byte-swapped FC field.
svn path=/trunk/; revision=8534
Diffstat (limited to 'packet-lwapp.c')
| -rw-r--r-- | packet-lwapp.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/packet-lwapp.c b/packet-lwapp.c index 6b31068d2f..9208922935 100644 --- a/packet-lwapp.c +++ b/packet-lwapp.c @@ -3,7 +3,7 @@ * Routines for LWAPP encapsulated packet disassembly * draft-calhoun-seamoby-lwapp-N (the current draft is 3) * - * $Id: packet-lwapp.c,v 1.3 2003/09/10 20:07:10 guy Exp $ + * $Id: packet-lwapp.c,v 1.4 2003/09/24 23:35:39 guy Exp $ * * Copyright (c) 2003 by David Frascone <dave@frascone.com> * @@ -75,8 +75,12 @@ static gint hf_lwapp_control_length = -1; static dissector_handle_t eth_handle; static dissector_handle_t wlan_handle; +static dissector_handle_t wlan_bsfc_handle; static dissector_handle_t data_handle; +/* Set by preferences */ +static gboolean swap_frame_control; + typedef struct { guint8 flags; guint8 fragmentId; @@ -421,11 +425,11 @@ static void dissect_lwapp(tvbuff_t *tvb, packet_info *pinfo, } /* tree */ + next_client = tvb_new_subset(tvb, sizeof(LWAPP_Header), -1, -1); if ((header.flags & LWAPP_FLAGS_T) == 0) { - next_client = tvb_new_subset(tvb, sizeof(LWAPP_Header), -1, -1); - call_dissector(wlan_handle, next_client, pinfo, tree); + call_dissector(swap_frame_control ? wlan_bsfc_handle : wlan_handle, + next_client, pinfo, tree); } else { - next_client = tvb_new_subset(tvb, sizeof(LWAPP_Header), -1, -1); dissect_control(next_client, pinfo, tree); } return; @@ -485,6 +489,7 @@ proto_register_lwapp(void) &ett_lwapp_control, &ett_lwapp_flags }; + module_t *lwapp_module; proto_lwapp = proto_register_protocol ("LWAPP Encapsulated Packet", "LWAPP", "lwapp"); @@ -497,6 +502,12 @@ proto_register_lwapp(void) proto_register_field_array(proto_lwapp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); + lwapp_module = prefs_register_protocol(proto_lwapp, NULL); + + prefs_register_bool_preference(lwapp_module,"swap_fc","Swap Frame Control", + "Swap frame control bytes (needed for some APs", + &swap_frame_control); + } /* proto_register_diameter */ void @@ -506,13 +517,13 @@ proto_reg_handoff_lwapp(void) dissector_handle_t lwapp_handle; /* - * Get handles for the Ethernet, and wireless dissectors. + * Get handles for the Ethernet and wireless dissectors. */ eth_handle = find_dissector("eth"); wlan_handle = find_dissector("wlan"); + wlan_bsfc_handle = find_dissector("wlan_bsfc"); data_handle = find_dissector("data"); - /* This dissector assumes lwapp packets in an 802.3 frame */ lwapp_l3_handle = create_dissector_handle(dissect_lwapp_l3, proto_lwapp_l3); |