diff options
author | etxrab <etxrab@f5534014-38df-0310-8fa8-9805f1628bb7> | 2008-08-12 04:44:35 +0000 |
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committer | etxrab <etxrab@f5534014-38df-0310-8fa8-9805f1628bb7> | 2008-08-12 04:44:35 +0000 |
commit | 40084ae7753e009353606ee40305cdafb3d1b88f (patch) | |
tree | 6d6b85f9c2dd3a8f248f104e4d79dd0b8c8f6769 /epan/dissectors/packet-i2c.c | |
parent | 81670aaf1103819ae2a7a334061d241db8a0e1a3 (diff) |
From Alexey Neyman:
Implement dissector for IPMB (DLT_IPMB_LINUX, 209).
git-svn-id: http://anonsvn.wireshark.org/wireshark/trunk@25986 f5534014-38df-0310-8fa8-9805f1628bb7
Diffstat (limited to 'epan/dissectors/packet-i2c.c')
-rw-r--r-- | epan/dissectors/packet-i2c.c | 306 |
1 files changed, 306 insertions, 0 deletions
diff --git a/epan/dissectors/packet-i2c.c b/epan/dissectors/packet-i2c.c new file mode 100644 index 0000000000..02dcfa4508 --- /dev/null +++ b/epan/dissectors/packet-i2c.c @@ -0,0 +1,306 @@ +/* packet-i2c.c + * Routines for I2C captures (using libpcap extensions) + * + * Pigeon Point Systems <www.pigeonpoint.com> + * + * $Id$ + * + * Ethereal - Network traffic analyzer + * By Gerald Combs <gerald@ethereal.com> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA + * 02111-1307, USA. + * + */ + +#ifdef HAVE_CONFIG_H +# include "config.h" +#endif + +#include <glib.h> +#include <epan/packet.h> +#include <epan/prefs.h> + +#include "packet-i2c.h" + +static int proto_i2c = -1; + +static int hf_i2c_bus = -1; +static int hf_i2c_event = -1; +static int hf_i2c_flags = -1; +static int hf_i2c_addr = -1; + +static gint ett_i2c = -1; + +enum { + SUB_DATA = 0, + SUB_IPMB, + + SUB_MAX +}; + +typedef gboolean (*sub_checkfunc_t)(packet_info *); + +static dissector_handle_t sub_handles[SUB_MAX]; +static gint sub_selected = SUB_IPMB; + +/* I2C packet flags. */ +#define I2C_FLAG_RD 0x00000001 +#define I2C_FLAG_TEN 0x00000010 +#define I2C_FLAG_REV_DIR_ADDR 0x00002000 +#define I2C_FLAG_NOSTART 0x00004000 + +/* I2C events. */ +#define I2C_EVENT_PROM_ON (1 << 0) /* Promiscuous mode: on */ +#define I2C_EVENT_PROM_OFF (1 << 1) /* Promiscuous mode: off */ +#define I2C_EVENT_ONLINE_ON (1 << 2) /* Online state: on */ +#define I2C_EVENT_ONLINE_OFF (1 << 3) /* Online state: off */ +#define I2C_EVENT_ATTACHED_ON (1 << 4) /* Attached state: on */ +#define I2C_EVENT_ATTACHED_OFF (1 << 5) /* Attached state: off */ +#define I2C_EVENT_PROM_OVFL_ON (1 << 6) /* Prom. queue overflow: on */ +#define I2C_EVENT_PROM_OVFL_OFF (1 << 7) /* Prom. queue overflow: off */ +#define I2C_EVENT_OVFL_ON (1 << 8) /* Queue overflow: on */ +#define I2C_EVENT_OVFL_OFF (1 << 9) /* Queue overflow: off */ + +/* I2C errors. */ +#define I2C_EVENT_ERR_DATA_LO (1 << 16) /* Unable to drive data LO */ +#define I2C_EVENT_ERR_DATA_HI (1 << 17) /* Unable to drive data HI */ +#define I2C_EVENT_ERR_CLOCK_LO (1 << 18) /* Unable to drive clock LO */ +#define I2C_EVENT_ERR_CLOCK_HI (1 << 19) /* Unable to drive clock HI */ +#define I2C_EVENT_ERR_CLOCK_TO (1 << 20) /* Clock low timeout */ +#define I2C_EVENT_ERR_PHYS (1 << 21) /* The I2C bus controller + has been physically + disconnected from the bus */ +#define I2C_EVENT_ERR_FAIL (1 << 22) /* Undiagnosed failure */ + +void +capture_i2c(union wtap_pseudo_header *pseudo_header, packet_counts *ld) +{ + if (pseudo_header->i2c.is_event) { + ld->i2c_event++; + } else { + ld->i2c_data++; + } +} + +static const char * +i2c_get_event_desc(int event) +{ + const char *desc; + + switch (event & 0x0000ffff) { + case I2C_EVENT_PROM_ON: + desc = "Promiscuous mode is enabled"; + break; + case I2C_EVENT_PROM_OFF: + desc = "Promiscuous mode is disabled"; + break; + case I2C_EVENT_ONLINE_ON: + desc = "The I2C controller is operational"; + break; + case I2C_EVENT_ONLINE_OFF: + desc = "The I2C controller is non-operational"; + break; + case I2C_EVENT_ATTACHED_ON: + desc = "The I2C controller is attached to an I2C bus"; + break; + case I2C_EVENT_ATTACHED_OFF: + desc = "The I2C controller is detached from an I2C bus"; + if (event & I2C_EVENT_ERR_DATA_LO) { + desc = "The I2C controller is detached from an I2C bus: " + "unable to drive data LO"; + } else if (event & I2C_EVENT_ERR_DATA_HI) { + desc = "The I2C controller is detached from an I2C bus: " + "unable to drive data HI"; + } else if (event & I2C_EVENT_ERR_CLOCK_LO) { + desc = "The I2C controller is detached from an I2C bus: " + "unable to drive clock LO"; + } else if (event & I2C_EVENT_ERR_CLOCK_HI) { + desc = "The I2C controller is detached from an I2C bus: " + "unable to drive clock HI"; + } else if (event & I2C_EVENT_ERR_CLOCK_TO) { + desc = "The I2C controller is detached from an I2C bus: " + "clock low timeout"; + } else if (event & I2C_EVENT_ERR_PHYS) { + desc = "The I2C controller is detached from an I2C bus: " + "the I2C bus controller has been physically " + "disconnected from the bus"; + } else if (event & I2C_EVENT_ERR_FAIL) { + desc = "The I2C controller is detached from an I2C bus: " + "undiagnosed failure"; + } + break; + case I2C_EVENT_PROM_OVFL_ON: + desc = "The incoming promiscuous data buffer has been overrun; " + "some data is lost"; + break; + case I2C_EVENT_PROM_OVFL_OFF: + desc = "The incoming promiscuous data buffer is available"; + break; + case I2C_EVENT_OVFL_ON: + desc = "The incoming I2C data buffer has been overrun; " + "some data is lost"; + break; + case I2C_EVENT_OVFL_OFF: + desc = "The incoming I2C data buffer is available"; + break; + default: + desc = "<unknown state event>"; + break; + } + + return desc; +} + +static gboolean +sub_check_ipmb(packet_info *pinfo) +{ + if (pinfo->pseudo_header->i2c.flags & I2C_FLAG_RD) { + /* Master-receive transactions are not possible on IPMB */ + return FALSE; + } + + return TRUE; +} + +static sub_checkfunc_t sub_check[SUB_MAX] = { + NULL, /* raw data */ + sub_check_ipmb /* IPMI */ +}; + +static void +dissect_i2c(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) +{ + proto_item *ti; + proto_tree *i2c_tree = NULL; + int is_event, bus, flags, addr, len; + + is_event = pinfo->pseudo_header->i2c.is_event; + flags = pinfo->pseudo_header->i2c.flags; + bus = pinfo->pseudo_header->i2c.bus; + len = tvb_length(tvb); + if (is_event) { + addr = 0; + } else { + if (len == 0) { + THROW(ReportedBoundsError); + } + /* Report 7-bit hardware address */ + addr = tvb_get_guint8(tvb, 0) >> 1; + } + + pinfo->ptype = PT_I2C; + + if (check_col(pinfo->cinfo, COL_PROTOCOL)) { + if (is_event) + col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "I2C Event"); + else + col_add_fstr(pinfo->cinfo, COL_PROTOCOL, "I2C %s", + (flags & I2C_FLAG_RD) ? "Read" : "Write"); + } + + if (check_col(pinfo->cinfo, COL_DEF_SRC)) { + col_add_fstr(pinfo->cinfo, COL_DEF_SRC, "I2C-%d", bus); + } + + if (check_col(pinfo->cinfo, COL_DEF_DST)) { + if (is_event) + col_add_fstr(pinfo->cinfo, COL_DEF_DST, "----"); + else + col_add_fstr(pinfo->cinfo, COL_DEF_DST, "0x%02x", addr); + } + + if (check_col(pinfo->cinfo, COL_INFO)) { + if (is_event) + col_add_fstr(pinfo->cinfo, COL_INFO, "%s", + i2c_get_event_desc(flags)); + else + col_add_fstr(pinfo->cinfo, COL_INFO, "I2C %s, %d bytes", + (flags & I2C_FLAG_RD) ? "Read" : "Write", len); + } + + if (tree) { + ti = proto_tree_add_protocol_format(tree, proto_i2c, tvb, 0, -1, + "Inter-Integrated Circuit (%s)", + is_event ? "Event" : "Data"); + + i2c_tree = proto_item_add_subtree(ti, ett_i2c); + proto_tree_add_uint_format(i2c_tree, hf_i2c_bus, tvb, 0, 0, bus, + "Bus: I2C-%d", bus); + + if (is_event) { + proto_tree_add_uint_format(i2c_tree, hf_i2c_event, tvb, 0, 0, + flags, "Event: %s (0x%08x)", + i2c_get_event_desc(flags), flags); + } else { + proto_tree_add_uint_format_value(i2c_tree, hf_i2c_addr, tvb, 0, 1, + addr, "0x%02x%s", addr, addr ? "" : " (General Call)"); + proto_tree_add_uint_format(i2c_tree, hf_i2c_flags, tvb, 0, 0, + flags, "Flags: 0x%08x", flags); + } + } + + if (!is_event) { + if (!sub_check[sub_selected] || sub_check[sub_selected](pinfo)) { + call_dissector(sub_handles[sub_selected], tvb, pinfo, tree); + } else { + call_dissector(sub_handles[SUB_DATA], tvb, pinfo, tree); + } + } +} + +void +proto_register_i2c(void) +{ + static hf_register_info hf[] = { + { &hf_i2c_bus, { "Bus ID", "i2c.bus", FT_UINT8, BASE_DEC, NULL, 0, "", HFILL }}, + { &hf_i2c_addr, { "Target address", "i2c.addr", FT_UINT8, BASE_HEX, NULL, 0, "", HFILL }}, + { &hf_i2c_event, { "Event", "i2c.event", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL }}, + { &hf_i2c_flags, { "Flags", "i2c.flags", FT_UINT32, BASE_HEX, NULL, 0, "", HFILL }}, + }; + static gint *ett[] = { + &ett_i2c + }; + static const enum_val_t sub_enum_vals[] = { + { "none", "None (raw I2C)", SUB_DATA }, + { "ipmb", "IPMB", SUB_IPMB }, + { NULL, NULL, 0 } + }; + module_t *m; + + proto_i2c = proto_register_protocol("Inter-Integrated Circuit", "I2C", "i2c"); + proto_register_field_array(proto_i2c, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + m = prefs_register_protocol(proto_i2c, NULL); + prefs_register_enum_preference(m, "type", "Bus type", "How the I2C messages are interpreted", + &sub_selected, sub_enum_vals, FALSE); +} + +void +proto_reg_handoff_i2c(void) +{ + static gboolean inited = FALSE; + if (!inited) { + dissector_handle_t i2c_handle; + + sub_handles[SUB_DATA] = find_dissector("data"); + sub_handles[SUB_IPMB] = find_dissector("ipmi"); + i2c_handle = create_dissector_handle(dissect_i2c, proto_i2c); + dissector_add("wtap_encap", WTAP_ENCAP_I2C, i2c_handle); + inited = TRUE; + } +} |