Ethereal-dev: [Ethereal-dev] TVB buffer question (for Nortel's Mutant IP)
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From: Charles Wilkinson <c_s_wilkinson@xxxxxxxxxxx>
Date: Thu, 1 Sep 2005 11:19:00 +0100 (BST)
Hi all, sorry once again but my monitor is close to a window, and before I throw it out of the window I'd like some help. Right first off I have dissected (ad-hocly) the entire 26 octets of a TVB. 20 of which ressemble IP, the next 6 are an addition to IP based on Nortels mutant form of IP.(which I know should have it's own ethertype... :) The questions I'd like to ask is: 1. Do I get everything past the dissection of a lower level protocol? i.e if I receive a tvb from the ethernet dissector, and I'm the IP dissector do I get the entire tvb starting at the version field of the IP header up to the VERY LAST octect of the packet? This seems to be so, but am I allowed to create tvb past the 20 bytes of the normal IP header (this is mutant IP remember;) 2. If so why can I not create a new tvb with hard coded values (which I counted by hand in the packet decode) and pass it to another dissector? I know there are 60 bytes of info after my header, I cut off the 26 bytes and say that there are 60 octets in the rest of the packet, I know this to be true yet I get a segmentation fault!!! I painstackingly counted every byte. I am posting the source, along with a an arp broadcast embedded in mutant Nortel IP embedded in Ethernet II with a vlan tag (the 26 octets I display are slightly incomplete but all the fields are displayed, even if in the wrong data types) In this source only the last 10 lines are of interest. So no one need waste their time reading it all a 'tail 10' on the file is all that is needed to tell me why what I am doing is wrong. Basically after I have dissected the 26 octets I have the begining of an arp broadcast with the destination of FF FF FF.... I know this arp broadcast is 60 bytes long why would a: next_tvb = tvb_new_subset( tvb, 26, 60,//replace with -6 to get this to work 60//replace with -6 to avoid segmentation fault ); call_dissector(eth_handle, next_tvb, pinfo,parent_tree); fail. There are 86 octets in total, (this I know from the iph->ip_len field and because I counted them) and I want to cut off the first 26 and pass on the remaining 60 octets. LET THIS BE CLEAR, I know what I want to acheive I am attaching the source only the last 10 lines are necessary to tell me why I am an idiot and what I am doing wrong :) I am also attaching a capture of an entire packet. MAC, followed by the vlan tag, followed by the Optical mutant IP, followed by an arp braodcast. This packet is a perfect example of what this in-house solution is supposed to be able to dissect. All Nortel care about is the outer header and the client packets inside the 6 bytes are rarely a problem. except for the poor suckers like me that have to find a solution to dissecting these packets!!! Please help, when you know that the packet is 60 bytes long and you get a segmentation fault, something possibily my sanity is failing... :) What is wrong with my call to tvb subset. Surely it is only cutting off the 26 bytes of header and passing the rest along... What is wrong!! Please help. All the best Charles ___________________________________________________________ To help you stay safe and secure online, we've developed the all new Yahoo! Security Centre. http://uk.security.yahoo.com
Attachment:
oe_arp_unicast.cap
Description: 836367727-oe_arp_unicast.cap
/* packet-ip.c * Routines for IP and miscellaneous IP protocol packet disassembly * * $Id: packet-ip.c 15007 2005-07-23 00:46:14Z sahlberg $ * * Ethereal - Network traffic analyzer * By Gerald Combs <gerald@xxxxxxxxxxxx> * Copyright 1998 Gerald Combs * * Monday, June 27, 2005 * Support for the ICMP extensions for MPLS * (http://www.ietf.org/proceedings/01aug/I-D/draft-ietf-mpls-icmp-02.txt) * by Maria-Luiza Crivat <luizacri@xxxxxxxxx> * & Brice Augustin <bricecotte@xxxxxxxxx> * * 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 <stdio.h> #include <string.h> #include <glib.h> #ifdef NEED_SNPRINTF_H # include "snprintf.h" #endif #include <epan/packet.h> #include <epan/addr_resolv.h> #include <epan/ipproto.h> #include "ip_opts.h" #include <epan/prefs.h> #include <epan/reassemble.h> #include "etypes.h" #include "greproto.h" #include "ppptypes.h" #include "llcsaps.h" #include "aftypes.h" #include "arcnet_pids.h" #include "packet-ip.h" #include "packet-ipsec.h" #include <epan/in_cksum.h> #include "nlpid.h" #include <epan/tap.h> static int ip_tap = -1; static void dissect_icmp(tvbuff_t *, packet_info *, proto_tree *); static void dissectOptical(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree); /* Decode the old IPv4 TOS field as the DiffServ DS Field (RFC2474/2475) */ static gboolean g_ip_dscp_actif = TRUE; /* Defragment fragmented IP datagrams */ static gboolean ip_defragment = FALSE; /* Place IP summary in proto tree */ static gboolean ip_summary_in_tree = TRUE; /* Decode the end of the ICMP payload as ICMP MPLS extensions if the packet in the payload has more than 128 bytes */ static gboolean favor_icmp_mpls_ext = FALSE; static int proto_ip = -1; static int hf_ip_version = -1; static int hf_ip_hdr_len = -1; static int hf_ip_dsfield = -1; static int hf_ip_dsfield_dscp = -1; static int hf_ip_dsfield_ect = -1; static int hf_ip_dsfield_ce = -1; static int hf_ip_tos = -1; static int hf_ip_tos_precedence = -1; static int hf_ip_tos_delay = -1; static int hf_ip_tos_throughput = -1; static int hf_ip_tos_reliability = -1; static int hf_ip_tos_cost = -1; static int hf_ip_len = -1; static int hf_ip_id = -1; static int hf_ip_dst = -1; static int hf_ip_dst_host = -1; static int hf_ip_src = -1; static int hf_ip_src_host = -1; static int hf_ip_addr = -1; static int hf_ip_host = -1; static int hf_ip_flags = -1; static int hf_ip_flags_rf = -1; static int hf_ip_flags_df = -1; static int hf_ip_flags_mf = -1; static int hf_ip_frag_offset = -1; static int hf_ip_ttl = -1; static int hf_ip_proto = -1; static int hf_ip_checksum = -1; static int hf_ip_checksum_bad = -1; static int hf_ip_fragments = -1; static int hf_ip_fragment = -1; static int hf_ip_fragment_overlap = -1; static int hf_ip_fragment_overlap_conflict = -1; static int hf_ip_fragment_multiple_tails = -1; static int hf_ip_fragment_too_long_fragment = -1; static int hf_ip_fragment_error = -1; static int hf_ip_reassembled_in = -1; static int hf_tls_tlsver = -1; static int hf_tls_flags1 = -1; static int hf_tls_flags2 = -1; static int hf_tls_MSG_CODE= -1; static int hf_tls_TDI = -1; static gint ett_ip = -1; static gint ett_ip_dsfield = -1; static gint ett_ip_tos = -1; static gint ett_ip_off = -1; static gint ett_ip_options = -1; static gint ett_ip_option_sec = -1; static gint ett_ip_option_route = -1; static gint ett_ip_option_timestamp = -1; static gint ett_ip_fragments = -1; static gint ett_ip_fragment = -1; static const fragment_items ip_frag_items = { &ett_ip_fragment, &ett_ip_fragments, &hf_ip_fragments, &hf_ip_fragment, &hf_ip_fragment_overlap, &hf_ip_fragment_overlap_conflict, &hf_ip_fragment_multiple_tails, &hf_ip_fragment_too_long_fragment, &hf_ip_fragment_error, &hf_ip_reassembled_in, "fragments" }; static dissector_table_t ip_dissector_table; static dissector_handle_t ip_handle; static dissector_handle_t data_handle; static int proto_icmp = -1; static int hf_icmp_type = -1; static int hf_icmp_code = -1; static int hf_icmp_checksum = -1; static int hf_icmp_checksum_bad = -1; static int hf_icmp_ident = -1; static int hf_icmp_seq_num = -1; static int hf_icmp_mtu = -1; static int hf_icmp_redir_gw = -1; /* Mobile ip */ static int hf_icmp_mip_type = -1; static int hf_icmp_mip_length = -1; static int hf_icmp_mip_prefix_length = -1; static int hf_icmp_mip_seq = -1; static int hf_icmp_mip_life = -1; static int hf_icmp_mip_flags = -1; static int hf_icmp_mip_r = -1; static int hf_icmp_mip_b = -1; static int hf_icmp_mip_h = -1; static int hf_icmp_mip_f = -1; static int hf_icmp_mip_m = -1; static int hf_icmp_mip_g = -1; static int hf_icmp_mip_v = -1; static int hf_icmp_mip_res = -1; static int hf_icmp_mip_reserved = -1; static int hf_icmp_mip_coa = -1; static int hf_icmp_mip_challenge = -1; /* MPLS extensions */ static int hf_icmp_mpls = -1; static int hf_icmp_mpls_version = -1; static int hf_icmp_mpls_reserved = -1; static int hf_icmp_mpls_checksum = -1; static int hf_icmp_mpls_checksum_bad = -1; static int hf_icmp_mpls_length = -1; static int hf_icmp_mpls_class = -1; static int hf_icmp_mpls_c_type = -1; static int hf_icmp_mpls_label = -1; static int hf_icmp_mpls_exp = -1; static int hf_icmp_mpls_s = -1; static int hf_icmp_mpls_ttl = -1; static gint ett_icmp = -1; static gint ett_icmp_mip = -1; static gint ett_icmp_mip_flags = -1; /* MPLS extensions */ static gint ett_icmp_mpls = -1; static gint ett_icmp_mpls_object = -1; static gint ett_icmp_mpls_stack_object = -1; /* ICMP definitions */ #define ICMP_ECHOREPLY 0 #define ICMP_UNREACH 3 #define ICMP_SOURCEQUENCH 4 #define ICMP_REDIRECT 5 #define ICMP_ECHO 8 #define ICMP_RTRADVERT 9 #define ICMP_RTRSOLICIT 10 #define ICMP_TIMXCEED 11 #define ICMP_PARAMPROB 12 #define ICMP_TSTAMP 13 #define ICMP_TSTAMPREPLY 14 #define ICMP_IREQ 15 #define ICMP_IREQREPLY 16 #define ICMP_MASKREQ 17 #define ICMP_MASKREPLY 18 /* ICMP UNREACHABLE */ #define ICMP_NET_UNREACH 0 /* Network Unreachable */ #define ICMP_HOST_UNREACH 1 /* Host Unreachable */ #define ICMP_PROT_UNREACH 2 /* Protocol Unreachable */ #define ICMP_PORT_UNREACH 3 /* Port Unreachable */ #define ICMP_FRAG_NEEDED 4 /* Fragmentation Needed/DF set */ #define ICMP_SR_FAILED 5 /* Source Route failed */ #define ICMP_NET_UNKNOWN 6 #define ICMP_HOST_UNKNOWN 7 #define ICMP_HOST_ISOLATED 8 #define ICMP_NET_ANO 9 #define ICMP_HOST_ANO 10 #define ICMP_NET_UNR_TOS 11 #define ICMP_HOST_UNR_TOS 12 #define ICMP_PKT_FILTERED 13 /* Packet filtered */ #define ICMP_PREC_VIOLATION 14 /* Precedence violation */ #define ICMP_PREC_CUTOFF 15 /* Precedence cut off */ /* IP structs and definitions */ /* Offsets of fields within an IP header. */ #define IPH_V_HL 0 #define IPH_TOS 1 #define IPH_LEN 2 #define IPH_ID 4 #define IPH_TTL 6 #define IPH_OFF 8 #define IPH_P 9 #define IPH_SUM 10 #define IPH_SRC 12 #define IPH_DST 16 /* Minimum IP header length. */ #define IPH_MIN_LEN 20 /* IP flags. */ #define IP_RF 0x8000 /* Flag: "Reserved bit" */ #define IP_DF 0x4000 /* Flag: "Don't Fragment" */ #define IP_MF 0x2000 /* Flag: "More Fragments" */ #define IP_OFFSET 0x1FFF /* "Fragment Offset" part */ /* Differentiated Services Field. See RFCs 2474, 2597 and 2598. */ #define IPDSFIELD_DSCP_MASK 0xFC #define IPDSFIELD_ECN_MASK 0x03 #define IPDSFIELD_DSCP_SHIFT 2 #define IPDSFIELD_DSCP(dsfield) (((dsfield)&IPDSFIELD_DSCP_MASK)>>IPDSFIELD_DSCP_SHIFT) #define IPDSFIELD_ECN(dsfield) ((dsfield)&IPDSFIELD_ECN_MASK) #define IPDSFIELD_DSCP_DEFAULT 0x00 #define IPDSFIELD_DSCP_CS1 0x08 #define IPDSFIELD_DSCP_CS2 0x10 #define IPDSFIELD_DSCP_CS3 0x18 #define IPDSFIELD_DSCP_CS4 0x20 #define IPDSFIELD_DSCP_CS5 0x28 #define IPDSFIELD_DSCP_CS6 0x30 #define IPDSFIELD_DSCP_CS7 0x38 #define IPDSFIELD_DSCP_AF11 0x0A #define IPDSFIELD_DSCP_AF12 0x0C #define IPDSFIELD_DSCP_AF13 0x0E #define IPDSFIELD_DSCP_AF21 0x12 #define IPDSFIELD_DSCP_AF22 0x14 #define IPDSFIELD_DSCP_AF23 0x16 #define IPDSFIELD_DSCP_AF31 0x1A #define IPDSFIELD_DSCP_AF32 0x1C #define IPDSFIELD_DSCP_AF33 0x1E #define IPDSFIELD_DSCP_AF41 0x22 #define IPDSFIELD_DSCP_AF42 0x24 #define IPDSFIELD_DSCP_AF43 0x26 #define IPDSFIELD_DSCP_EF 0x2E #define IPDSFIELD_ECT_MASK 0x02 #define IPDSFIELD_CE_MASK 0x01 /* IP TOS, superseded by the DS Field, RFC 2474. */ #define IPTOS_TOS_MASK 0x1E #define IPTOS_TOS(tos) ((tos) & IPTOS_TOS_MASK) #define IPTOS_NONE 0x00 #define IPTOS_LOWCOST 0x02 #define IPTOS_RELIABILITY 0x04 #define IPTOS_THROUGHPUT 0x08 #define IPTOS_LOWDELAY 0x10 #define IPTOS_SECURITY 0x1E #define IPTOS_PREC_MASK 0xE0 #define IPTOS_PREC_SHIFT 5 #define IPTOS_PREC(tos) (((tos)&IPTOS_PREC_MASK)>>IPTOS_PREC_SHIFT) #define IPTOS_PREC_NETCONTROL 7 #define IPTOS_PREC_INTERNETCONTROL 6 #define IPTOS_PREC_CRITIC_ECP 5 #define IPTOS_PREC_FLASHOVERRIDE 4 #define IPTOS_PREC_FLASH 3 #define IPTOS_PREC_IMMEDIATE 2 #define IPTOS_PREC_PRIORITY 1 #define IPTOS_PREC_ROUTINE 0 /* IP options */ #define IPOPT_COPY 0x80 #define IPOPT_CONTROL 0x00 #define IPOPT_RESERVED1 0x20 #define IPOPT_MEASUREMENT 0x40 #define IPOPT_RESERVED2 0x60 #define IPOPT_END (0 |IPOPT_CONTROL) #define IPOPT_NOOP (1 |IPOPT_CONTROL) #define IPOPT_SEC (2 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_LSRR (3 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_TIMESTAMP (4 |IPOPT_MEASUREMENT) #define IPOPT_RR (7 |IPOPT_CONTROL) #define IPOPT_SID (8 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_SSRR (9 |IPOPT_CONTROL|IPOPT_COPY) #define IPOPT_RA (20|IPOPT_CONTROL|IPOPT_COPY) /* IP option lengths */ #define IPOLEN_SEC 11 #define IPOLEN_LSRR_MIN 3 #define IPOLEN_TIMESTAMP_MIN 5 #define IPOLEN_RR_MIN 3 #define IPOLEN_SID 4 #define IPOLEN_SSRR_MIN 3 #define IPOLEN_RA 4 #define IPSEC_UNCLASSIFIED 0x0000 #define IPSEC_CONFIDENTIAL 0xF135 #define IPSEC_EFTO 0x789A #define IPSEC_MMMM 0xBC4D #define IPSEC_RESTRICTED 0xAF13 #define IPSEC_SECRET 0xD788 #define IPSEC_TOPSECRET 0x6BC5 #define IPSEC_RESERVED1 0x35E2 #define IPSEC_RESERVED2 0x9AF1 #define IPSEC_RESERVED3 0x4D78 #define IPSEC_RESERVED4 0x24BD #define IPSEC_RESERVED5 0x135E #define IPSEC_RESERVED6 0x89AF #define IPSEC_RESERVED7 0xC4D6 #define IPSEC_RESERVED8 0xE26B #define IPOPT_TS_TSONLY 0 /* timestamps only */ #define IPOPT_TS_TSANDADDR 1 /* timestamps and addresses */ #define IPOPT_TS_PRESPEC 3 /* specified modules only */ /* * defragmentation of IPv4 */ static GHashTable *ip_fragment_table = NULL; static GHashTable *ip_reassembled_table = NULL; static void ip_defragment_init(void) { fragment_table_init(&ip_fragment_table); reassembled_table_init(&ip_reassembled_table); } void capture_ip(const guchar *pd, int offset, int len, packet_counts *ld) { if (!BYTES_ARE_IN_FRAME(offset, len, IPH_MIN_LEN)) { ld->other++; return; } switch (pd[offset + 9]) { case IP_PROTO_SCTP: ld->sctp++; break; case IP_PROTO_TCP: ld->tcp++; break; case IP_PROTO_UDP: ld->udp++; break; case IP_PROTO_ICMP: case IP_PROTO_ICMPV6: /* XXX - separate counters? */ ld->icmp++; break; case IP_PROTO_OSPF: ld->ospf++; break; case IP_PROTO_GRE: ld->gre++; break; case IP_PROTO_VINES: ld->vines++; break; default: ld->other++; } } static void dissect_ipopt_security(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset, guint optlen, packet_info *pinfo _U_, proto_tree *opt_tree) { proto_tree *field_tree = NULL; proto_item *tf; guint val; static const value_string secl_vals[] = { {IPSEC_UNCLASSIFIED, "Unclassified"}, {IPSEC_CONFIDENTIAL, "Confidential"}, {IPSEC_EFTO, "EFTO" }, {IPSEC_MMMM, "MMMM" }, {IPSEC_RESTRICTED, "Restricted" }, {IPSEC_SECRET, "Secret" }, {IPSEC_TOPSECRET, "Top secret" }, {IPSEC_RESERVED1, "Reserved" }, {IPSEC_RESERVED2, "Reserved" }, {IPSEC_RESERVED3, "Reserved" }, {IPSEC_RESERVED4, "Reserved" }, {IPSEC_RESERVED5, "Reserved" }, {IPSEC_RESERVED6, "Reserved" }, {IPSEC_RESERVED7, "Reserved" }, {IPSEC_RESERVED8, "Reserved" }, {0, NULL } }; tf = proto_tree_add_text(opt_tree, tvb, offset, optlen, "%s:", optp->name); field_tree = proto_item_add_subtree(tf, *optp->subtree_index); offset += 2; val = tvb_get_ntohs(tvb, offset); proto_tree_add_text(field_tree, tvb, offset, 2, "Security: %s", val_to_str(val, secl_vals, "Unknown (0x%x)")); offset += 2; val = tvb_get_ntohs(tvb, offset); proto_tree_add_text(field_tree, tvb, offset, 2, "Compartments: %u", val); offset += 2; proto_tree_add_text(field_tree, tvb, offset, 2, "Handling restrictions: %c%c", tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1)); offset += 2; proto_tree_add_text(field_tree, tvb, offset, 3, "Transmission control code: %c%c%c", tvb_get_guint8(tvb, offset), tvb_get_guint8(tvb, offset + 1), tvb_get_guint8(tvb, offset + 2)); } static void dissect_ipopt_route(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset, guint optlen, packet_info *pinfo _U_, proto_tree *opt_tree) { proto_tree *field_tree = NULL; proto_item *tf; int ptr; int optoffset = 0; guint32 addr; tf = proto_tree_add_text(opt_tree, tvb, offset, optlen, "%s (%u bytes)", optp->name, optlen); field_tree = proto_item_add_subtree(tf, *optp->subtree_index); optoffset += 2; /* skip past type and length */ optlen -= 2; /* subtract size of type and length */ ptr = tvb_get_guint8(tvb, offset + optoffset); proto_tree_add_text(field_tree, tvb, offset + optoffset, 1, "Pointer: %d%s", ptr, ((ptr < 4) ? " (points before first address)" : ((ptr & 3) ? " (points to middle of address)" : ""))); optoffset++; optlen--; ptr--; /* ptr is 1-origin */ while (optlen > 0) { if (optlen < 4) { proto_tree_add_text(field_tree, tvb, offset, optlen, "(suboption would go past end of option)"); break; } /* Avoids alignment problems on many architectures. */ tvb_memcpy(tvb, (guint8 *)&addr, offset + optoffset, sizeof(addr)); proto_tree_add_text(field_tree, tvb, offset + optoffset, 4, "%s%s", ((addr == 0) ? "-" : (char *)get_hostname(addr)), ((optoffset == ptr) ? " <- (current)" : "")); optoffset += 4; optlen -= 4; } } static void dissect_ipopt_sid(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset, guint optlen, packet_info *pinfo _U_, proto_tree *opt_tree) { proto_tree_add_text(opt_tree, tvb, offset, optlen, "%s: %u", optp->name, tvb_get_ntohs(tvb, offset + 2)); return; } static void dissect_ipopt_timestamp(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset, guint optlen, packet_info *pinfo _U_, proto_tree *opt_tree) { proto_tree *field_tree = NULL; proto_item *tf; int ptr; int optoffset = 0; int flg; static const value_string flag_vals[] = { {IPOPT_TS_TSONLY, "Time stamps only" }, {IPOPT_TS_TSANDADDR, "Time stamp and address" }, {IPOPT_TS_PRESPEC, "Time stamps for prespecified addresses"}, {0, NULL } }; guint32 addr; guint ts; tf = proto_tree_add_text(opt_tree, tvb, offset, optlen, "%s:", optp->name); field_tree = proto_item_add_subtree(tf, *optp->subtree_index); optoffset += 2; /* skip past type and length */ optlen -= 2; /* subtract size of type and length */ ptr = tvb_get_guint8(tvb, offset + optoffset); proto_tree_add_text(field_tree, tvb, offset + optoffset, 1, "Pointer: %d%s", ptr, ((ptr < 5) ? " (points before first address)" : (((ptr - 1) & 3) ? " (points to middle of address)" : ""))); optoffset++; optlen--; ptr--; /* ptr is 1-origin */ flg = tvb_get_guint8(tvb, offset + optoffset); proto_tree_add_text(field_tree, tvb, offset + optoffset, 1, "Overflow: %u", flg >> 4); flg &= 0xF; proto_tree_add_text(field_tree, tvb, offset + optoffset, 1, "Flag: %s", val_to_str(flg, flag_vals, "Unknown (0x%x)")); optoffset++; optlen--; while (optlen > 0) { if (flg == IPOPT_TS_TSANDADDR) { if (optlen < 8) { proto_tree_add_text(field_tree, tvb, offset + optoffset, optlen, "(suboption would go past end of option)"); break; } tvb_memcpy(tvb, (guint8 *)&addr, offset + optoffset, sizeof(addr)); ts = tvb_get_ntohl(tvb, offset + optoffset + 4); optlen -= 8; proto_tree_add_text(field_tree, tvb, offset + optoffset, 8, "Address = %s, time stamp = %u", ((addr == 0) ? "-" : (char *)get_hostname(addr)), ts); optoffset += 8; } else { if (optlen < 4) { proto_tree_add_text(field_tree, tvb, offset + optoffset, optlen, "(suboption would go past end of option)"); break; } ts = tvb_get_ntohl(tvb, offset + optoffset); optlen -= 4; proto_tree_add_text(field_tree, tvb, offset + optoffset, 4, "Time stamp = %u", ts); optoffset += 4; } } } static void dissect_ipopt_ra(const ip_tcp_opt *optp, tvbuff_t *tvb, int offset, guint optlen, packet_info *pinfo _U_, proto_tree *opt_tree) { /* Router-Alert, as defined by RFC2113 */ int opt = tvb_get_ntohs(tvb, offset + 2); static const value_string ra_opts[] = { {0, "Every router examines packet"}, {0, NULL} }; proto_tree_add_text(opt_tree, tvb, offset, optlen, "%s: %s", optp->name, val_to_str(opt, ra_opts, "Unknown (%d)")); return; } static const ip_tcp_opt ipopts[] = { { IPOPT_END, "EOL", NULL, NO_LENGTH, 0, NULL, }, { IPOPT_NOOP, "NOP", NULL, NO_LENGTH, 0, NULL, }, { IPOPT_SEC, "Security", &ett_ip_option_sec, FIXED_LENGTH, IPOLEN_SEC, dissect_ipopt_security }, { IPOPT_SSRR, "Strict source route", &ett_ip_option_route, VARIABLE_LENGTH, IPOLEN_SSRR_MIN, dissect_ipopt_route }, { IPOPT_LSRR, "Loose source route", &ett_ip_option_route, VARIABLE_LENGTH, IPOLEN_LSRR_MIN, dissect_ipopt_route }, { IPOPT_RR, "Record route", &ett_ip_option_route, VARIABLE_LENGTH, IPOLEN_RR_MIN, dissect_ipopt_route }, { IPOPT_SID, "Stream identifier", NULL, FIXED_LENGTH, IPOLEN_SID, dissect_ipopt_sid }, { IPOPT_TIMESTAMP, "Time stamp", &ett_ip_option_timestamp, VARIABLE_LENGTH, IPOLEN_TIMESTAMP_MIN, dissect_ipopt_timestamp }, { IPOPT_RA, "Router Alert", NULL, FIXED_LENGTH, IPOLEN_RA, dissect_ipopt_ra }, }; #define N_IP_OPTS (sizeof ipopts / sizeof ipopts[0]) /* Dissect the IP or TCP options in a packet. */ void dissect_ip_tcp_options(tvbuff_t *tvb, int offset, guint length, const ip_tcp_opt *opttab, int nopts, int eol, packet_info *pinfo, proto_tree *opt_tree) { guchar opt; const ip_tcp_opt *optp; opt_len_type len_type; unsigned int optlen; char *name; char name_str[7+1+1+2+2+1+1]; /* "Unknown (0x%02x)" */ void (*dissect)(const struct ip_tcp_opt *, tvbuff_t *, int, guint, packet_info *, proto_tree *); guint len; while (length > 0) { opt = tvb_get_guint8(tvb, offset); for (optp = &opttab[0]; optp < &opttab[nopts]; optp++) { if (optp->optcode == opt) break; } if (optp == &opttab[nopts]) { /* We assume that the only NO_LENGTH options are EOL and NOP options, so that we can treat unknown options as VARIABLE_LENGTH with a minimum of 2, and at least be able to move on to the next option by using the length in the option. */ optp = NULL; /* indicate that we don't know this option */ len_type = VARIABLE_LENGTH; optlen = 2; snprintf(name_str, sizeof name_str, "Unknown (0x%02x)", opt); name = name_str; dissect = NULL; } else { len_type = optp->len_type; optlen = optp->optlen; name = optp->name; dissect = optp->dissect; } --length; /* account for type byte */ if (len_type != NO_LENGTH) { /* Option has a length. Is it in the packet? */ if (length == 0) { /* Bogus - packet must at least include option code byte and length byte! */ proto_tree_add_text(opt_tree, tvb, offset, 1, "%s (length byte past end of options)", name); return; } len = tvb_get_guint8(tvb, offset + 1); /* total including type, len */ --length; /* account for length byte */ if (len < 2) { /* Bogus - option length is too short to include option code and option length. */ proto_tree_add_text(opt_tree, tvb, offset, 2, "%s (with too-short option length = %u byte%s)", name, len, plurality(len, "", "s")); return; } else if (len - 2 > length) { /* Bogus - option goes past the end of the header. */ proto_tree_add_text(opt_tree, tvb, offset, length, "%s (option length = %u byte%s says option goes past end of options)", name, len, plurality(len, "", "s")); return; } else if (len_type == FIXED_LENGTH && len != optlen) { /* Bogus - option length isn't what it's supposed to be for this option. */ proto_tree_add_text(opt_tree, tvb, offset, len, "%s (with option length = %u byte%s; should be %u)", name, len, plurality(len, "", "s"), optlen); return; } else if (len_type == VARIABLE_LENGTH && len < optlen) { /* Bogus - option length is less than what it's supposed to be for this option. */ proto_tree_add_text(opt_tree, tvb, offset, len, "%s (with option length = %u byte%s; should be >= %u)", name, len, plurality(len, "", "s"), optlen); return; } else { if (optp == NULL) { proto_tree_add_text(opt_tree, tvb, offset, len, "%s (%u byte%s)", name, len, plurality(len, "", "s")); } else { if (dissect != NULL) { /* Option has a dissector. */ (*dissect)(optp, tvb, offset, len, pinfo, opt_tree); } else { /* Option has no data, hence no dissector. */ proto_tree_add_text(opt_tree, tvb, offset, len, "%s", name); } } len -= 2; /* subtract size of type and length */ offset += 2 + len; } length -= len; } else { proto_tree_add_text(opt_tree, tvb, offset, 1, "%s", name); offset += 1; } if (opt == eol) break; } } const value_string dscp_vals[] = { { IPDSFIELD_DSCP_DEFAULT, "Default" }, { IPDSFIELD_DSCP_CS1, "Class Selector 1" }, { IPDSFIELD_DSCP_CS2, "Class Selector 2" }, { IPDSFIELD_DSCP_CS3, "Class Selector 3" }, { IPDSFIELD_DSCP_CS4, "Class Selector 4" }, { IPDSFIELD_DSCP_CS5, "Class Selector 5" }, { IPDSFIELD_DSCP_CS6, "Class Selector 6" }, { IPDSFIELD_DSCP_CS7, "Class Selector 7" }, { IPDSFIELD_DSCP_AF11, "Assured Forwarding 11" }, { IPDSFIELD_DSCP_AF12, "Assured Forwarding 12" }, { IPDSFIELD_DSCP_AF13, "Assured Forwarding 13" }, { IPDSFIELD_DSCP_AF21, "Assured Forwarding 21" }, { IPDSFIELD_DSCP_AF22, "Assured Forwarding 22" }, { IPDSFIELD_DSCP_AF23, "Assured Forwarding 23" }, { IPDSFIELD_DSCP_AF31, "Assured Forwarding 31" }, { IPDSFIELD_DSCP_AF32, "Assured Forwarding 32" }, { IPDSFIELD_DSCP_AF33, "Assured Forwarding 33" }, { IPDSFIELD_DSCP_AF41, "Assured Forwarding 41" }, { IPDSFIELD_DSCP_AF42, "Assured Forwarding 42" }, { IPDSFIELD_DSCP_AF43, "Assured Forwarding 43" }, { IPDSFIELD_DSCP_EF, "Expedited Forwarding" }, { 0, NULL } }; static const value_string precedence_vals[] = { { IPTOS_PREC_ROUTINE, "routine" }, { IPTOS_PREC_PRIORITY, "priority" }, { IPTOS_PREC_IMMEDIATE, "immediate" }, { IPTOS_PREC_FLASH, "flash" }, { IPTOS_PREC_FLASHOVERRIDE, "flash override" }, { IPTOS_PREC_CRITIC_ECP, "CRITIC/ECP" }, { IPTOS_PREC_INTERNETCONTROL, "internetwork control" }, { IPTOS_PREC_NETCONTROL, "network control" }, { 0, NULL } }; static const value_string iptos_vals[] = { { IPTOS_NONE, "None" }, { IPTOS_LOWCOST, "Minimize cost" }, { IPTOS_RELIABILITY, "Maximize reliability" }, { IPTOS_THROUGHPUT, "Maximize throughput" }, { IPTOS_LOWDELAY, "Minimize delay" }, { IPTOS_SECURITY, "Maximize security" }, { 0, NULL } }; static const true_false_string tos_set_low = { "Low", "Normal" }; static const true_false_string tos_set_high = { "High", "Normal" }; static guint16 ip_checksum(const guint8 *ptr, int len) { vec_t cksum_vec[1]; cksum_vec[0].ptr = ptr; cksum_vec[0].len = len; return in_cksum(&cksum_vec[0], 1); }; static const true_false_string tls_flag1 [] = { "Multicast", "Unicast" }; static const true_false_string tls_flag2 [] = { "Data/Control", "Normal" }; static void dissect_ip(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) { proto_tree *ip_tree = NULL, *field_tree; proto_item *ti = NULL, *tf; guint32 addr; int offset = 0; guint hlen, optlen; guint16 flags; guint8 nxt; guint16 ipsum; fragment_data *ipfd_head=NULL; tvbuff_t *next_tvb; gboolean update_col_info = TRUE; gboolean save_fragmented; static e_ip eip_arr[4]; static int eip_current=0; e_ip *iph; const guchar *src_addr, *dst_addr; guint32 src32, dst32; proto_tree *tree; proto_item *item; /*Handle Optical Packets * Optical Ethernet packets have Protocol field == 129 * Handle disection and hand off back to ethertype to continue to dissect the customers packets * Coded by Charles Wilkinson: c_s_wilkinson@xxxxxxxxxxx */ if ( tvb_get_guint8(tvb, offset + 9) == 129) { dissectOptical(tvb, pinfo, parent_tree); return; } tree=parent_tree; eip_current++; if(eip_current==4){ eip_current=0; } iph=&eip_arr[eip_current]; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "IP"); if (check_col(pinfo->cinfo, COL_INFO)) col_clear(pinfo->cinfo, COL_INFO); iph->ip_v_hl = tvb_get_guint8(tvb, offset); hlen = lo_nibble(iph->ip_v_hl) * 4; /* IP header length, in bytes */ if (tree) { ti = proto_tree_add_item(tree, proto_ip, tvb, offset, hlen, FALSE); ip_tree = proto_item_add_subtree(ti, ett_ip); proto_tree_add_uint(ip_tree, hf_ip_version, tvb, offset, 1, hi_nibble(iph->ip_v_hl)); } /* if IP is not referenced from any filters we dont need to worry about generating any tree items. We must do this after we created the actual protocol above so that proto hier stat still works though. */ if(!proto_field_is_referenced(parent_tree, proto_ip)){ tree=NULL; } if (hlen < IPH_MIN_LEN) { if (check_col(pinfo->cinfo, COL_INFO)) col_add_fstr(pinfo->cinfo, COL_INFO, "Bogus IP header length (%u, must be at least %u)", hlen, IPH_MIN_LEN); if (tree) { proto_tree_add_uint_format(ip_tree, hf_ip_hdr_len, tvb, offset, 1, hlen, "Header length: %u bytes (bogus, must be at least %u)", hlen, IPH_MIN_LEN); } goto end_of_ip; } if (tree) { proto_tree_add_uint_format(ip_tree, hf_ip_hdr_len, tvb, offset, 1, hlen, "Header length: %u bytes", hlen); } iph->ip_tos = tvb_get_guint8(tvb, offset + 1); if (tree) { if (g_ip_dscp_actif) { tf = proto_tree_add_uint_format(ip_tree, hf_ip_dsfield, tvb, offset + 1, 1, iph->ip_tos, "Differentiated Services Field: 0x%02x (DSCP 0x%02x: %s; ECN: 0x%02x)", iph->ip_tos, IPDSFIELD_DSCP(iph->ip_tos), val_to_str(IPDSFIELD_DSCP(iph->ip_tos), dscp_vals, "Unknown DSCP"),IPDSFIELD_ECN(iph->ip_tos)); field_tree = proto_item_add_subtree(tf, ett_ip_dsfield); proto_tree_add_uint(field_tree, hf_ip_dsfield_dscp, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_uint(field_tree, hf_ip_dsfield_ect, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_uint(field_tree, hf_ip_dsfield_ce, tvb, offset + 1, 1, iph->ip_tos); } else { tf = proto_tree_add_uint_format(ip_tree, hf_ip_tos, tvb, offset + 1, 1, iph->ip_tos, "Type of service: 0x%02x (%s)", iph->ip_tos, val_to_str( IPTOS_TOS(iph->ip_tos), iptos_vals, "Unknown") ); field_tree = proto_item_add_subtree(tf, ett_ip_tos); proto_tree_add_uint(field_tree, hf_ip_tos_precedence, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_delay, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_throughput, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_reliability, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_cost, tvb, offset + 1, 1, iph->ip_tos); } } /* Length of IP datagram. XXX - what if this is greater than the reported length of the tvbuff? This could happen, for example, in an IP datagram inside an ICMP datagram; we need to somehow let the dissector we call know that, as it might want to avoid doing its checksumming. */ iph->ip_len = tvb_get_ntohs(tvb, offset + 2); /* Adjust the length of this tvbuff to include only the IP datagram. */ set_actual_length(tvb, iph->ip_len); if (iph->ip_len < hlen) { if (check_col(pinfo->cinfo, COL_INFO)) col_add_fstr(pinfo->cinfo, COL_INFO, "Bogus IP length (%u, less than header length %u)", iph->ip_len, hlen); if (tree) { proto_tree_add_uint_format(ip_tree, hf_ip_len, tvb, offset + 2, 2, iph->ip_len, "Total length: %u bytes (bogus, less than header length %u)", iph->ip_len, hlen); } goto end_of_ip; } if (tree) proto_tree_add_uint(ip_tree, hf_ip_len, tvb, offset + 2, 2, iph->ip_len); iph->ip_id = tvb_get_ntohs(tvb, offset + 4); if (tree) proto_tree_add_uint_format(ip_tree, hf_ip_id, tvb, offset + 4, 2, iph->ip_id, "Identification: 0x%04x (%d)", iph->ip_id, iph->ip_id); iph->ip_off = tvb_get_ntohs(tvb, offset + 6); if (tree) { flags = (iph->ip_off & (IP_RF | IP_DF | IP_MF)) >> 12; tf = proto_tree_add_uint(ip_tree, hf_ip_flags, tvb, offset + 6, 1, flags); field_tree = proto_item_add_subtree(tf, ett_ip_off); proto_tree_add_boolean(field_tree, hf_ip_flags_rf, tvb, offset + 6, 1, flags); if (flags & (IP_DF>>12)) proto_item_append_text(tf, " (Don't Fragment)"); proto_tree_add_boolean(field_tree, hf_ip_flags_df, tvb, offset + 6, 1, flags); if (flags & (IP_MF>>12)) proto_item_append_text(tf, " (More Fragments)"); proto_tree_add_boolean(field_tree, hf_ip_flags_mf, tvb, offset + 6, 1, flags); proto_tree_add_uint(ip_tree, hf_ip_frag_offset, tvb, offset + 6, 2, (iph->ip_off & IP_OFFSET)*8); } if (tree) proto_tree_add_item(ip_tree, hf_ip_ttl, tvb, offset + 8, 1, FALSE); iph->ip_p = tvb_get_guint8(tvb, offset + 9); if (tree) { proto_tree_add_uint_format(ip_tree, hf_ip_proto, tvb, offset + 9, 1, iph->ip_p, "Protocol: %s (0x%02x)", ipprotostr(iph->ip_p), iph->ip_p); } iph->ip_sum = tvb_get_ntohs(tvb, offset + 10); /* * If we have the entire IP header available, check the checksum. */ if (tvb_bytes_exist(tvb, offset, hlen)) { ipsum = ip_checksum(tvb_get_ptr(tvb, offset, hlen), hlen); if (tree) { if (ipsum == 0) { proto_tree_add_uint_format(ip_tree, hf_ip_checksum, tvb, offset + 10, 2, iph->ip_sum, "Header checksum: 0x%04x [correct]", iph->ip_sum); } else { proto_tree_add_uint_format(ip_tree, hf_ip_checksum, tvb, offset + 10, 2, iph->ip_sum, "Header checksum: 0x%04x [incorrect, should be 0x%04x]", iph->ip_sum, in_cksum_shouldbe(iph->ip_sum, ipsum)); item = proto_tree_add_boolean(ip_tree, hf_ip_checksum_bad, tvb, offset + 10, 2, TRUE); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); } } } else { ipsum = 0; if (tree) proto_tree_add_uint(ip_tree, hf_ip_checksum, tvb, offset + 10, 2, iph->ip_sum); } src_addr = tvb_get_ptr(tvb, offset + IPH_SRC, 4); src32 = tvb_get_ntohl(tvb, offset + IPH_SRC); SET_ADDRESS(&pinfo->net_src, AT_IPv4, 4, src_addr); SET_ADDRESS(&pinfo->src, AT_IPv4, 4, src_addr); SET_ADDRESS(&iph->ip_src, AT_IPv4, 4, src_addr); if (tree) { memcpy(&addr, iph->ip_src.data, 4); if (ip_summary_in_tree) { proto_item_append_text(ti, ", Src: %s (%s)", get_hostname(addr), ip_to_str(iph->ip_src.data)); } proto_tree_add_ipv4(ip_tree, hf_ip_src, tvb, offset + 12, 4, addr); item = proto_tree_add_ipv4(ip_tree, hf_ip_addr, tvb, offset + 12, 4, addr); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_src_host, tvb, offset + 12, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_host, tvb, offset + 12, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); } dst_addr = tvb_get_ptr(tvb, offset + IPH_DST, 4); dst32 = tvb_get_ntohl(tvb, offset + IPH_DST); SET_ADDRESS(&pinfo->net_dst, AT_IPv4, 4, dst_addr); SET_ADDRESS(&pinfo->dst, AT_IPv4, 4, dst_addr); SET_ADDRESS(&iph->ip_dst, AT_IPv4, 4, dst_addr); if (tree) { memcpy(&addr, iph->ip_dst.data, 4); if (ip_summary_in_tree) { proto_item_append_text(ti, ", Dst: %s (%s)", get_hostname(addr), ip_to_str(iph->ip_dst.data)); } proto_tree_add_ipv4(ip_tree, hf_ip_dst, tvb, offset + 16, 4, addr); item = proto_tree_add_ipv4(ip_tree, hf_ip_addr, tvb, offset + 16, 4, addr); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_dst_host, tvb, offset + 16, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_host, tvb, offset + 16, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); } if (tree) { /* Decode IP options, if any. */ if (hlen > IPH_MIN_LEN) { /* There's more than just the fixed-length header. Decode the options. */ optlen = hlen - IPH_MIN_LEN; /* length of options, in bytes */ tf = proto_tree_add_text(ip_tree, tvb, offset + 20, optlen, "Options: (%u bytes)", optlen); field_tree = proto_item_add_subtree(tf, ett_ip_options); dissect_ip_tcp_options(tvb, offset + 20, optlen, ipopts, N_IP_OPTS, IPOPT_END, pinfo, field_tree); } } pinfo->ipproto = iph->ip_p; pinfo->iplen = iph->ip_len; pinfo->iphdrlen = hlen; /* Skip over header + options */ offset += hlen; nxt = iph->ip_p; /* XXX - what if this isn't the same for all fragments? */ /* If ip_defragment is on, this is a fragment, we have all the data * in the fragment, and the header checksum is valid, then just add * the fragment to the hashtable. */ save_fragmented = pinfo->fragmented; if (ip_defragment && (iph->ip_off & (IP_MF|IP_OFFSET)) && tvb_bytes_exist(tvb, offset, pinfo->iplen - pinfo->iphdrlen) && ipsum == 0) { ipfd_head = fragment_add_check(tvb, offset, pinfo, iph->ip_id ^ src32 ^ dst32, ip_fragment_table, ip_reassembled_table, (iph->ip_off & IP_OFFSET)*8, pinfo->iplen - pinfo->iphdrlen, iph->ip_off & IP_MF); next_tvb = process_reassembled_data(tvb, offset, pinfo, "Reassembled IPv4", ipfd_head, &ip_frag_items, &update_col_info, ip_tree); } else { /* If this is the first fragment, dissect its contents, otherwise just show it as a fragment. XXX - if we eventually don't save the reassembled contents of all fragmented datagrams, we may want to always reassemble. */ if (iph->ip_off & IP_OFFSET) { /* Not the first fragment - don't dissect it. */ next_tvb = NULL; } else { /* First fragment, or not fragmented. Dissect what we have here. */ /* Get a tvbuff for the payload. */ next_tvb = tvb_new_subset(tvb, offset, -1, -1); /* * If this is the first fragment, but not the only fragment, * tell the next protocol that. */ if (iph->ip_off & IP_MF) pinfo->fragmented = TRUE; else pinfo->fragmented = FALSE; } } if (next_tvb == NULL) { /* Just show this as a fragment. */ if (check_col(pinfo->cinfo, COL_INFO)) { col_add_fstr(pinfo->cinfo, COL_INFO, "Fragmented IP protocol (proto=%s 0x%02x, off=%u)", ipprotostr(iph->ip_p), iph->ip_p, (iph->ip_off & IP_OFFSET) * 8); } if( ipfd_head && ipfd_head->reassembled_in != pinfo->fd->num ){ if (check_col(pinfo->cinfo, COL_INFO)) { col_append_fstr(pinfo->cinfo, COL_INFO, " [Reassembled in #%u]", ipfd_head->reassembled_in); } } call_dissector(data_handle, tvb_new_subset(tvb, offset, -1, -1), pinfo, parent_tree); pinfo->fragmented = save_fragmented; goto end_of_ip; } /* Hand off to the next protocol. XXX - setting the columns only after trying various dissectors means that if one of those dissectors throws an exception, the frame won't even be labelled as an IP frame; ideally, if a frame being dissected throws an exception, it'll be labelled as a mangled frame of the type in question. */ if (!dissector_try_port(ip_dissector_table, nxt, next_tvb, pinfo, parent_tree)) { /* Unknown protocol */ if (update_col_info) { if (check_col(pinfo->cinfo, COL_INFO)) col_add_fstr(pinfo->cinfo, COL_INFO, "%s (0x%02x)", ipprotostr(iph->ip_p), iph->ip_p); } call_dissector(data_handle,next_tvb, pinfo, parent_tree); } pinfo->fragmented = save_fragmented; end_of_ip: tap_queue_packet(ip_tap, pinfo, iph); } #define ICMP_MIP_EXTENSION_PAD 0 #define ICMP_MIP_MOB_AGENT_ADV 16 #define ICMP_MIP_PREFIX_LENGTHS 19 #define ICMP_MIP_CHALLENGE 24 static value_string mip_extensions[] = { { ICMP_MIP_EXTENSION_PAD, "One byte padding extension"}, /* RFC 2002 */ { ICMP_MIP_MOB_AGENT_ADV, "Mobility Agent Advertisement Extension"}, /* RFC 2002 */ { ICMP_MIP_PREFIX_LENGTHS, "Prefix Lengths Extension"}, /* RFC 2002 */ { ICMP_MIP_CHALLENGE, "Challenge Extension"}, /* RFC 3012 */ { 0, NULL} }; /* * Dissect the mobile ip advertisement extensions. */ static void dissect_mip_extensions(tvbuff_t *tvb, size_t offset, proto_tree *tree) { guint8 type; guint8 length; guint8 flags; proto_item *ti; proto_tree *mip_tree=NULL; proto_tree *flags_tree=NULL; gint numCOAs; gint i; /* Not much to do if we're not parsing everything */ if (!tree) return; while (tvb_reported_length_remaining(tvb, offset) > 0) { type = tvb_get_guint8(tvb, offset + 0); if (type) length = tvb_get_guint8(tvb, offset + 1); else length=0; ti = proto_tree_add_text(tree, tvb, offset, type?(length + 2):1, "Ext: %s", val_to_str(type, mip_extensions, "Unknown ext %u")); mip_tree = proto_item_add_subtree(ti, ett_icmp_mip); switch (type) { case ICMP_MIP_EXTENSION_PAD: /* One byte padding extension */ /* Add our fields */ /* type */ proto_tree_add_item(mip_tree, hf_icmp_mip_type, tvb, offset, 1, FALSE); offset++; break; case ICMP_MIP_MOB_AGENT_ADV: /* Mobility Agent Advertisement Extension (RFC 2002)*/ /* Add our fields */ /* type */ proto_tree_add_item(mip_tree, hf_icmp_mip_type, tvb, offset, 1, FALSE); offset++; /* length */ proto_tree_add_item(mip_tree, hf_icmp_mip_length, tvb, offset, 1, FALSE); offset++; /* sequence number */ proto_tree_add_item(mip_tree, hf_icmp_mip_seq, tvb, offset, 2, FALSE); offset+=2; /* Registration Lifetime */ proto_tree_add_item(mip_tree, hf_icmp_mip_life, tvb, offset, 2, FALSE); offset+=2; /* flags */ flags = tvb_get_guint8(tvb, offset); ti = proto_tree_add_item(mip_tree, hf_icmp_mip_flags, tvb, offset, 1, FALSE); flags_tree = proto_item_add_subtree(ti, ett_icmp_mip_flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_r, tvb, offset, 1, flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_b, tvb, offset, 1, flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_h, tvb, offset, 1, flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_f, tvb, offset, 1, flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_m, tvb, offset, 1, flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_g, tvb, offset, 1, flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_v, tvb, offset, 1, flags); proto_tree_add_boolean(flags_tree, hf_icmp_mip_res, tvb, offset, 1, flags); offset++; /* Reserved */ proto_tree_add_item(mip_tree, hf_icmp_mip_reserved, tvb, offset, 1, FALSE); offset++; /* COAs */ numCOAs = (length - 6) / 4; for (i=0; i<numCOAs; i++) { proto_tree_add_item(mip_tree, hf_icmp_mip_coa, tvb, offset, 4, FALSE); offset+=4; } break; case ICMP_MIP_PREFIX_LENGTHS: /* Prefix-Lengths Extension (RFC 2002)*/ /* Add our fields */ /* type */ proto_tree_add_item(mip_tree, hf_icmp_mip_type, tvb, offset, 1, FALSE); offset++; /* length */ proto_tree_add_item(mip_tree, hf_icmp_mip_length, tvb, offset, 1, FALSE); offset++; /* prefix lengths */ for(i=0; i<length; i++) { proto_tree_add_item(mip_tree, hf_icmp_mip_prefix_length, tvb, offset, 1, FALSE); offset++; } break; case ICMP_MIP_CHALLENGE: /* Challenge Extension (RFC 3012)*/ /* type */ proto_tree_add_item(mip_tree, hf_icmp_mip_type, tvb, offset, 1, FALSE); offset++; /* length */ proto_tree_add_item(mip_tree, hf_icmp_mip_length, tvb, offset, 1, FALSE); offset++; /* challenge */ proto_tree_add_item(mip_tree, hf_icmp_mip_challenge, tvb, offset, length, FALSE); offset+=length; break; default: g_warning("Unknown type(%u)! I hope the length is right (%u)", type, length); offset += length + 2; break; } /* switch type */ } /* end while */ } /* dissect_mip_extensions */ #define MPLS_STACK_ENTRY_OBJECT_CLASS 1 #define MPLS_EXTENDED_PAYLOAD_OBJECT_CLASS 2 #define MPLS_STACK_ENTRY_C_TYPE 1 #define MPLS_EXTENDED_PAYLOAD_C_TYPE 1 /* XXX no header defines these macros ??? */ #ifndef min #define min(a,b) (((a)<(b))?(a):(b)) #endif #ifndef max #define max(a,b) (((a)>(b))?(a):(b)) #endif /* * Dissect the MPLS extensions */ static void dissect_mpls_extensions(tvbuff_t *tvb, size_t offset, proto_tree *tree) { guint8 version; guint8 class_num; guint8 c_type; guint8 ttl; guint8 tmp; guint16 reserved; guint16 cksum, computed_cksum; guint16 obj_length, obj_trunc_length; proto_item *ti, *tf_object, *tf_entry; proto_tree *mpls_tree=NULL, *mpls_object_tree, *mpls_stack_object_tree; guint obj_end_offset; guint reported_length; guint label; gboolean unknown_object; if (!tree) return; reported_length = tvb_reported_length_remaining(tvb, offset); if (reported_length < 4 /* Common header */) { proto_tree_add_text(tree, tvb, offset, reported_length, "MPLS Extensions (truncated)"); return; } /* Add a tree for the MPLS extensions */ ti = proto_tree_add_none_format(tree, hf_icmp_mpls, tvb, offset, reported_length, "MPLS Extensions"); mpls_tree = proto_item_add_subtree(ti, ett_icmp_mpls); /* Version */ version = hi_nibble(tvb_get_guint8(tvb, offset)); proto_tree_add_uint(mpls_tree, hf_icmp_mpls_version, tvb, offset, 1, version); /* Reserved */ reserved = tvb_get_ntohs(tvb, offset) & 0x0fff; proto_tree_add_uint_format(mpls_tree, hf_icmp_mpls_reserved, tvb, offset, 2, reserved, "Reserved: 0x%03x", reserved); /* Checksum */ cksum = tvb_get_ntohs(tvb, offset + 2); computed_cksum = ip_checksum(tvb_get_ptr(tvb, offset, reported_length), reported_length); if (computed_cksum == 0) { proto_tree_add_uint_format(mpls_tree, hf_icmp_mpls_checksum, tvb, offset + 2, 2, cksum, "Checksum: 0x%04x [correct]", cksum); } else { proto_tree_add_boolean_hidden(mpls_tree, hf_icmp_mpls_checksum_bad, tvb, offset + 2, 2, TRUE); proto_tree_add_uint_format(mpls_tree, hf_icmp_mpls_checksum, tvb, offset + 2, 2, cksum, "Checksum: 0x%04x [incorrect, should be 0x%04x]", cksum, in_cksum_shouldbe(cksum, computed_cksum)); } if (version != 1 && version != 2) { /* Unsupported version */ proto_item_append_text(ti, " (unsupported version)"); return; } /* Skip the common header */ offset += 4; /* While there is enough room to read an object */ while (tvb_reported_length_remaining(tvb, offset) >= 4 /* Object header */) { /* Object length */ obj_length = tvb_get_ntohs(tvb, offset); obj_trunc_length = min(obj_length, tvb_reported_length_remaining(tvb, offset)); obj_end_offset = offset + obj_trunc_length; /* Add a subtree for this object (the text will be reset later) */ tf_object = proto_tree_add_text(mpls_tree, tvb, offset, max(obj_trunc_length, 4), "Unknown object"); mpls_object_tree = proto_item_add_subtree(tf_object, ett_icmp_mpls_object); proto_tree_add_uint(mpls_object_tree, hf_icmp_mpls_length, tvb, offset, 2, obj_length); /* Class */ class_num = tvb_get_guint8(tvb, offset + 2); proto_tree_add_uint(mpls_object_tree, hf_icmp_mpls_class, tvb, offset + 2, 1, class_num); /* C-Type */ c_type = tvb_get_guint8(tvb, offset + 3); proto_tree_add_uint(mpls_object_tree, hf_icmp_mpls_c_type, tvb, offset + 3, 1, c_type); if (obj_length < 4 /* Object header */) { /* Thanks doc/README.developer :)) */ proto_item_set_text(tf_object, "Object with bad length"); break; } /* Skip the object header */ offset += 4; /* Default cases will set this flag to TRUE */ unknown_object = FALSE; switch (class_num) { case MPLS_STACK_ENTRY_OBJECT_CLASS: switch (c_type) { case MPLS_STACK_ENTRY_C_TYPE: proto_item_set_text(tf_object, "MPLS Stack Entry"); /* For each entry */ while (offset + 4 <= obj_end_offset) { if (tvb_reported_length_remaining(tvb, offset) < 4) { /* Not enough room in the packet ! */ break; } /* Create a subtree for each entry (the text will be set later) */ tf_entry = proto_tree_add_text(mpls_object_tree, tvb, offset, 4, " "); mpls_stack_object_tree = proto_item_add_subtree(tf_entry, ett_icmp_mpls_stack_object); /* Label */ label = (guint)tvb_get_ntohs(tvb, offset); tmp = tvb_get_guint8(tvb, offset + 2); label = (label << 4) + (tmp >> 4); proto_tree_add_uint(mpls_stack_object_tree, hf_icmp_mpls_label, tvb, offset, 3, label << 4); proto_item_set_text(tf_entry, "Label: %u", label); /* Experimental field (also called "CoS") */ proto_tree_add_uint(mpls_stack_object_tree, hf_icmp_mpls_exp, tvb, offset + 2, 1, tmp); proto_item_append_text(tf_entry, ", Exp: %u", (tmp >> 1) & 0x07); /* Stack bit */ proto_tree_add_boolean(mpls_stack_object_tree, hf_icmp_mpls_s, tvb, offset + 2, 1, tmp); proto_item_append_text(tf_entry, ", S: %u", tmp & 0x01); /* TTL */ ttl = tvb_get_guint8(tvb, offset + 3); proto_tree_add_item(mpls_stack_object_tree, hf_icmp_mpls_ttl, tvb, offset + 3, 1, FALSE); proto_item_append_text(tf_entry, ", TTL: %u", ttl); /* Skip the entry */ offset += 4; } /* end while */ if (offset < obj_end_offset) proto_tree_add_text(mpls_object_tree, tvb, offset, obj_end_offset - offset, "%ld junk bytes", (long)(obj_end_offset - offset)); break; default: unknown_object = TRUE; break; } /* end switch c_type */ break; case MPLS_EXTENDED_PAYLOAD_OBJECT_CLASS: switch (c_type) { case MPLS_EXTENDED_PAYLOAD_C_TYPE: proto_item_set_text(tf_object, "Extended Payload"); /* This object contains some portion of the original packet that could not fit in the 128 bytes of the ICMP payload */ if (obj_trunc_length > 4) proto_tree_add_text(mpls_object_tree, tvb, offset, obj_trunc_length - 4, "Data (%d bytes)", obj_trunc_length - 4); break; default: unknown_object = TRUE; break; } /* end switch c_type */ break; default: unknown_object = TRUE; break; } /* end switch class_num */ /* The switches couldn't decode the object */ if (unknown_object == TRUE) { proto_item_set_text(tf_object, "Unknown object (%d/%d)", class_num, c_type); if (obj_trunc_length > 4) proto_tree_add_text(mpls_object_tree, tvb, offset, obj_trunc_length - 4, "Data (%d bytes)", obj_trunc_length - 4); } /* */ if (obj_trunc_length < obj_length) proto_item_append_text(tf_object, " (truncated)"); /* Go to the end of the object */ offset = obj_end_offset; } /* end while */ } /* end dissect_mpls_extensions */ static const gchar *unreach_str[] = {"Network unreachable", "Host unreachable", "Protocol unreachable", "Port unreachable", "Fragmentation needed", "Source route failed", "Destination network unknown", "Destination host unknown", "Source host isolated", "Network administratively prohibited", "Host administratively prohibited", "Network unreachable for TOS", "Host unreachable for TOS", "Communication administratively filtered", "Host precedence violation", "Precedence cutoff in effect"}; #define N_UNREACH (sizeof unreach_str / sizeof unreach_str[0]) static const gchar *redir_str[] = {"Redirect for network", "Redirect for host", "Redirect for TOS and network", "Redirect for TOS and host"}; #define N_REDIRECT (sizeof redir_str / sizeof redir_str[0]) static const gchar *ttl_str[] = {"Time to live exceeded in transit", "Fragment reassembly time exceeded"}; #define N_TIMXCEED (sizeof ttl_str / sizeof ttl_str[0]) static const gchar *par_str[] = {"IP header bad", "Required option missing"}; #define N_PARAMPROB (sizeof par_str / sizeof par_str[0]) /* * RFC 792 for basic ICMP. * RFC 1191 for ICMP_FRAG_NEEDED (with MTU of next hop). * RFC 1256 for router discovery messages. * RFC 2002 and 3012 for Mobile IP stuff. */ static void dissect_icmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree) { proto_tree *icmp_tree; proto_item *ti; guint8 icmp_type; guint8 icmp_code; guint length, reported_length; guint16 cksum, computed_cksum; gchar type_str[64], code_str[64] = ""; guint8 num_addrs = 0; guint8 addr_entry_size = 0; int i; gboolean save_in_error_pkt; tvbuff_t *next_tvb; proto_item *item; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "ICMP"); if (check_col(pinfo->cinfo, COL_INFO)) col_clear(pinfo->cinfo, COL_INFO); /* To do: check for runts, errs, etc. */ icmp_type = tvb_get_guint8(tvb, 0); icmp_code = tvb_get_guint8(tvb, 1); cksum = tvb_get_ntohs(tvb, 2); switch (icmp_type) { case ICMP_ECHOREPLY: strcpy(type_str, "Echo (ping) reply"); break; case ICMP_UNREACH: strcpy(type_str, "Destination unreachable"); if (icmp_code < N_UNREACH) { sprintf(code_str, "(%s)", unreach_str[icmp_code]); } else { strcpy(code_str, "(Unknown - error?)"); } break; case ICMP_SOURCEQUENCH: strcpy(type_str, "Source quench (flow control)"); break; case ICMP_REDIRECT: strcpy(type_str, "Redirect"); if (icmp_code < N_REDIRECT) { sprintf(code_str, "(%s)", redir_str[icmp_code]); } else { strcpy(code_str, "(Unknown - error?)"); } break; case ICMP_ECHO: strcpy(type_str, "Echo (ping) request"); break; case ICMP_RTRADVERT: switch (icmp_code) { case 16: /* Mobile-Ip */ strcpy(type_str, "Mobile IP Advertisement"); break; default: strcpy(type_str, "Router advertisement"); break; } /* switch icmp_code */ break; case ICMP_RTRSOLICIT: strcpy(type_str, "Router solicitation"); break; case ICMP_TIMXCEED: strcpy(type_str, "Time-to-live exceeded"); if (icmp_code < N_TIMXCEED) { sprintf(code_str, "(%s)", ttl_str[icmp_code]); } else { strcpy(code_str, "(Unknown - error?)"); } break; case ICMP_PARAMPROB: strcpy(type_str, "Parameter problem"); if (icmp_code < N_PARAMPROB) { sprintf(code_str, "(%s)", par_str[icmp_code]); } else { strcpy(code_str, "(Unknown - error?)"); } break; case ICMP_TSTAMP: strcpy(type_str, "Timestamp request"); break; case ICMP_TSTAMPREPLY: strcpy(type_str, "Timestamp reply"); break; case ICMP_IREQ: strcpy(type_str, "Information request"); break; case ICMP_IREQREPLY: strcpy(type_str, "Information reply"); break; case ICMP_MASKREQ: strcpy(type_str, "Address mask request"); break; case ICMP_MASKREPLY: strcpy(type_str, "Address mask reply"); break; default: strcpy(type_str, "Unknown ICMP (obsolete or malformed?)"); break; } if (check_col(pinfo->cinfo, COL_INFO)) { col_add_str(pinfo->cinfo, COL_INFO, type_str); if (type_str[0] != '\0') col_append_fstr(pinfo->cinfo, COL_INFO, " %s", code_str); } if (tree) { length = tvb_length(tvb); reported_length = tvb_reported_length(tvb); ti = proto_tree_add_item(tree, proto_icmp, tvb, 0, length, FALSE); icmp_tree = proto_item_add_subtree(ti, ett_icmp); proto_tree_add_uint_format(icmp_tree, hf_icmp_type, tvb, 0, 1, icmp_type, "Type: %u (%s)", icmp_type, type_str); proto_tree_add_uint_format(icmp_tree, hf_icmp_code, tvb, 1, 1, icmp_code, "Code: %u %s", icmp_code, code_str); if (!pinfo->fragmented && length >= reported_length) { /* The packet isn't part of a fragmented datagram and isn't truncated, so we can checksum it. */ computed_cksum = ip_checksum(tvb_get_ptr(tvb, 0, reported_length), reported_length); if (computed_cksum == 0) { proto_tree_add_uint_format(icmp_tree, hf_icmp_checksum, tvb, 2, 2, cksum, "Checksum: 0x%04x [correct]", cksum); } else { item = proto_tree_add_boolean(icmp_tree, hf_icmp_checksum_bad, tvb, 2, 2, TRUE); PROTO_ITEM_SET_HIDDEN(item); proto_tree_add_uint_format(icmp_tree, hf_icmp_checksum, tvb, 2, 2, cksum, "Checksum: 0x%04x [incorrect, should be 0x%04x]", cksum, in_cksum_shouldbe(cksum, computed_cksum)); } } else { proto_tree_add_uint(icmp_tree, hf_icmp_checksum, tvb, 2, 2, cksum); } /* Decode the second 4 bytes of the packet. */ switch (icmp_type) { case ICMP_ECHOREPLY: case ICMP_ECHO: case ICMP_TSTAMP: case ICMP_TSTAMPREPLY: case ICMP_IREQ: case ICMP_IREQREPLY: case ICMP_MASKREQ: case ICMP_MASKREPLY: proto_tree_add_item(icmp_tree, hf_icmp_ident, tvb, 4, 2, FALSE); proto_tree_add_item(icmp_tree, hf_icmp_seq_num, tvb, 6, 2, FALSE); break; case ICMP_UNREACH: switch (icmp_code) { case ICMP_FRAG_NEEDED: proto_tree_add_item(icmp_tree, hf_icmp_mtu, tvb, 6, 2, FALSE); break; } break; case ICMP_RTRADVERT: num_addrs = tvb_get_guint8(tvb, 4); proto_tree_add_text(icmp_tree, tvb, 4, 1, "Number of addresses: %u", num_addrs); addr_entry_size = tvb_get_guint8(tvb, 5); proto_tree_add_text(icmp_tree, tvb, 5, 1, "Address entry size: %u", addr_entry_size); proto_tree_add_text(icmp_tree, tvb, 6, 2, "Lifetime: %s", time_secs_to_str(tvb_get_ntohs(tvb, 6))); break; case ICMP_PARAMPROB: proto_tree_add_text(icmp_tree, tvb, 4, 1, "Pointer: %u", tvb_get_guint8(tvb, 4)); break; case ICMP_REDIRECT: proto_tree_add_item(icmp_tree, hf_icmp_redir_gw, tvb, 4, 4, FALSE); break; } /* Decode the additional information in the packet. */ switch (icmp_type) { case ICMP_UNREACH: case ICMP_TIMXCEED: case ICMP_PARAMPROB: case ICMP_SOURCEQUENCH: case ICMP_REDIRECT: /* Save the current value of the "we're inside an error packet" flag, and set that flag; subdissectors may treat packets that are the payload of error packets differently from "real" packets. */ save_in_error_pkt = pinfo->in_error_pkt; pinfo->in_error_pkt = TRUE; /* Decode the IP header and first 64 bits of data from the original datagram. */ next_tvb = tvb_new_subset(tvb, 8, -1, -1); /* There is a collision between RFC 1812 and draft-ietf-mpls-icmp-02. We don't know how to decode the 128th and following bytes of the ICMP payload. According to draft-ietf-mpls-icmp-02, these bytes should be decoded as MPLS extensions whereas RFC 1812 tells us to decode them as a portion of the original packet. Let the user decide. Here the user decided to favor MPLS extensions. Force the IP dissector to decode only the first 128 bytes. */ if ((tvb_reported_length(tvb) > 8 + 128) && favor_icmp_mpls_ext && (tvb_get_ntohs(tvb, 8 + 2) > 128)) set_actual_length(next_tvb, 128); call_dissector(ip_handle, next_tvb, pinfo, icmp_tree); /* Restore the "we're inside an error packet" flag. */ pinfo->in_error_pkt = save_in_error_pkt; /* Decode MPLS extensions if the payload has at least 128 bytes, and - the original packet in the ICMP payload has less than 128 bytes, or - the user favors the MPLS extensions analysis */ if ((tvb_reported_length(tvb) > 8 + 128) && (tvb_get_ntohs(tvb, 8 + 2) <= 128 || favor_icmp_mpls_ext)) dissect_mpls_extensions(tvb, 8 + 128, icmp_tree); break; case ICMP_ECHOREPLY: case ICMP_ECHO: call_dissector(data_handle, tvb_new_subset(tvb, 8, -1, -1), pinfo, icmp_tree); break; case ICMP_RTRADVERT: if (addr_entry_size == 2) { for (i = 0; i < num_addrs; i++) { proto_tree_add_text(icmp_tree, tvb, 8 + (i*8), 4, "Router address: %s", ip_to_str(tvb_get_ptr(tvb, 8 + (i*8), 4))); proto_tree_add_text(icmp_tree, tvb, 12 + (i*8), 4, "Preference level: %d", tvb_get_ntohl(tvb, 12 + (i*8))); } if (icmp_code == 16) { /* Mobile-Ip */ dissect_mip_extensions(tvb, 8 + i*8, icmp_tree); } } else call_dissector(data_handle, tvb_new_subset(tvb, 8, -1, -1), pinfo, icmp_tree); break; case ICMP_TSTAMP: case ICMP_TSTAMPREPLY: proto_tree_add_text(icmp_tree, tvb, 8, 4, "Originate timestamp: %u", tvb_get_ntohl(tvb, 8)); proto_tree_add_text(icmp_tree, tvb, 12, 4, "Receive timestamp: %u", tvb_get_ntohl(tvb, 12)); proto_tree_add_text(icmp_tree, tvb, 16, 4, "Transmit timestamp: %u", tvb_get_ntohl(tvb, 16)); break; case ICMP_MASKREQ: case ICMP_MASKREPLY: proto_tree_add_text(icmp_tree, tvb, 8, 4, "Address mask: %s (0x%08x)", ip_to_str(tvb_get_ptr(tvb, 8, 4)), tvb_get_ntohl(tvb, 8)); break; } } } void proto_register_ip(void) { static hf_register_info hf[] = { { &hf_ip_version, { "Version", "ip.version", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_ip_hdr_len, { "Header Length", "ip.hdr_len", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_ip_dsfield, { "Differentiated Services field", "ip.dsfield", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_ip_dsfield_dscp, { "Differentiated Services Codepoint", "ip.dsfield.dscp", FT_UINT8, BASE_HEX, VALS(dscp_vals), IPDSFIELD_DSCP_MASK, "", HFILL }}, { &hf_ip_dsfield_ect, { "ECN-Capable Transport (ECT)", "ip.dsfield.ect", FT_UINT8, BASE_DEC, NULL, IPDSFIELD_ECT_MASK, "", HFILL }}, { &hf_ip_dsfield_ce, { "ECN-CE", "ip.dsfield.ce", FT_UINT8, BASE_DEC, NULL, IPDSFIELD_CE_MASK, "", HFILL }}, { &hf_ip_tos, { "Type of Service", "ip.tos", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_ip_tos_precedence, { "Precedence", "ip.tos.precedence", FT_UINT8, BASE_DEC, VALS(precedence_vals), IPTOS_PREC_MASK, "", HFILL }}, { &hf_ip_tos_delay, { "Delay", "ip.tos.delay", FT_BOOLEAN, 8, TFS(&tos_set_low), IPTOS_LOWDELAY, "", HFILL }}, { &hf_ip_tos_throughput, { "Throughput", "ip.tos.throughput", FT_BOOLEAN, 8, TFS(&tos_set_high), IPTOS_THROUGHPUT, "", HFILL }}, { &hf_ip_tos_reliability, { "Reliability", "ip.tos.reliability", FT_BOOLEAN, 8, TFS(&tos_set_high), IPTOS_RELIABILITY, "", HFILL }}, { &hf_ip_tos_cost, { "Cost", "ip.tos.cost", FT_BOOLEAN, 8, TFS(&tos_set_low), IPTOS_LOWCOST, "", HFILL }}, { &hf_ip_len, { "Total Length", "ip.len", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_ip_id, { "Identification", "ip.id", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_ip_dst, { "Destination", "ip.dst", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_ip_dst_host, { "Destination Host", "ip.dst_host", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_ip_src, { "Source", "ip.src", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_ip_src_host, { "Source Host", "ip.src_host", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_ip_addr, { "Source or Destination Address", "ip.addr", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_ip_host, { "Source or Destination Host", "ip.host", FT_STRING, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_ip_flags, { "Flags", "ip.flags", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_ip_flags_rf, { "Reserved bit", "ip.flags.rb", FT_BOOLEAN, 4, TFS(&flags_set_truth), IP_RF >> 12, "", HFILL }}, { &hf_ip_flags_df, { "Don't fragment", "ip.flags.df", FT_BOOLEAN, 4, TFS(&flags_set_truth), IP_DF >> 12, "", HFILL }}, { &hf_ip_flags_mf, { "More fragments", "ip.flags.mf", FT_BOOLEAN, 4, TFS(&flags_set_truth), IP_MF >> 12, "", HFILL }}, { &hf_ip_frag_offset, { "Fragment offset", "ip.frag_offset", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_ip_ttl, { "Time to live", "ip.ttl", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_ip_proto, { "Protocol", "ip.proto", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_ip_checksum, { "Header checksum", "ip.checksum", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_ip_checksum_bad, { "Bad Header checksum", "ip.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_ip_fragment_overlap, { "Fragment overlap", "ip.fragment.overlap", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Fragment overlaps with other fragments", HFILL }}, { &hf_ip_fragment_overlap_conflict, { "Conflicting data in fragment overlap", "ip.fragment.overlap.conflict", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Overlapping fragments contained conflicting data", HFILL }}, { &hf_ip_fragment_multiple_tails, { "Multiple tail fragments found", "ip.fragment.multipletails", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Several tails were found when defragmenting the packet", HFILL }}, { &hf_ip_fragment_too_long_fragment, { "Fragment too long", "ip.fragment.toolongfragment", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "Fragment contained data past end of packet", HFILL }}, { &hf_ip_fragment_error, { "Defragmentation error", "ip.fragment.error", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "Defragmentation error due to illegal fragments", HFILL }}, { &hf_ip_fragment, { "IP Fragment", "ip.fragment", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "IP Fragment", HFILL }}, { &hf_ip_fragments, { "IP Fragments", "ip.fragments", FT_NONE, BASE_NONE, NULL, 0x0, "IP Fragments", HFILL }}, { &hf_ip_reassembled_in, { "Reassembled IP in frame", "ip.reassembled_in", FT_FRAMENUM, BASE_NONE, NULL, 0x0, "This IP packet is reassembled in this frame", HFILL }}, { &hf_tls_tlsver, { "Tls Version", "ip.tls.tlsver", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_tls_flags1, { "Multicast flag", "ip.tls.flags", FT_BOOLEAN, BASE_NONE, TFS(&tls_flag1), NULL, 0x0, "", HFILL }}, { &hf_tls_flags2, { "Data/Control flag", "ip.tls.flags2", FT_BOOLEAN, BASE_NONE, TFS(&tls_flag2), NULL, 0x0, "", HFILL }}, { &hf_tls_MSG_CODE, { "Message Code", "ip.tls.MSG_CODE", FT_BOOLEAN, 2, NULL, 0xff, "", HFILL }}, { &hf_tls_TDI, { "TDI", "ip.tls.TDI", FT_BOOLEAN, 3, NULL, 0xfff, "", HFILL }} }; static gint *ett[] = { &ett_ip, &ett_ip_dsfield, &ett_ip_tos, &ett_ip_off, &ett_ip_options, &ett_ip_option_sec, &ett_ip_option_route, &ett_ip_option_timestamp, &ett_ip_fragments, &ett_ip_fragment, }; module_t *ip_module; proto_ip = proto_register_protocol("Internet Protocol", "IP", "ip"); proto_register_field_array(proto_ip, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); /* subdissector code */ ip_dissector_table = register_dissector_table("ip.proto", "IP protocol", FT_UINT8, BASE_DEC); /* Register configuration options */ ip_module = prefs_register_protocol(proto_ip, NULL); prefs_register_bool_preference(ip_module, "decode_tos_as_diffserv", "Decode IPv4 TOS field as DiffServ field", "Whether the IPv4 type-of-service field should be decoded as a Differentiated Services field (see RFC2474/RFC2475)", &g_ip_dscp_actif); prefs_register_bool_preference(ip_module, "defragment", "Reassemble fragmented IP datagrams", "Whether fragmented IP datagrams should be reassembled", &ip_defragment); prefs_register_bool_preference(ip_module, "summary_in_tree", "Show IP summary in protocol tree", "Whether the IP summary line should be shown in the protocol tree", &ip_summary_in_tree); register_dissector("ip", dissect_ip, proto_ip); register_init_routine(ip_defragment_init); ip_tap=register_tap("ip"); } void proto_reg_handoff_ip(void) { dissector_handle_t ip_handle; data_handle = find_dissector("data"); ip_handle = find_dissector("ip"); dissector_add("ethertype", ETHERTYPE_IP, ip_handle); dissector_add("ppp.protocol", PPP_IP, ip_handle); dissector_add("ppp.protocol", ETHERTYPE_IP, ip_handle); dissector_add("gre.proto", ETHERTYPE_IP, ip_handle); dissector_add("gre.proto", GRE_WCCP, ip_handle); dissector_add("llc.dsap", SAP_IP, ip_handle); dissector_add("ip.proto", IP_PROTO_IPIP, ip_handle); dissector_add("null.type", BSD_AF_INET, ip_handle); dissector_add("chdlctype", ETHERTYPE_IP, ip_handle); dissector_add("osinl.excl", NLPID_IP, ip_handle); dissector_add("fr.ietf", NLPID_IP, ip_handle); dissector_add("x.25.spi", NLPID_IP, ip_handle); dissector_add("arcnet.protocol_id", ARCNET_PROTO_IP_1051, ip_handle); dissector_add("arcnet.protocol_id", ARCNET_PROTO_IP_1201, ip_handle); dissector_add_handle("udp.port", ip_handle); } void proto_register_icmp(void) { static hf_register_info hf[] = { { &hf_icmp_type, { "Type", "icmp.type", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_icmp_code, { "Code", "icmp.code", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_icmp_checksum, { "Checksum", "icmp.checksum", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_icmp_checksum_bad, { "Bad Checksum", "icmp.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_icmp_ident, {"Identifier", "icmp.ident", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_icmp_seq_num, {"Sequence number", "icmp.seq", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_icmp_mtu, {"MTU of next hop", "icmp.mtu", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}}, { &hf_icmp_redir_gw, {"Gateway address", "icmp.redir_gw", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_icmp_mip_type, { "Extension Type", "icmp.mip.type", FT_UINT8, BASE_DEC, VALS(mip_extensions), 0x0,"", HFILL}}, { &hf_icmp_mip_length, { "Length", "icmp.mip.length", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}}, { &hf_icmp_mip_prefix_length, { "Prefix Length", "icmp.mip.prefixlength", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL}}, { &hf_icmp_mip_seq, { "Sequence Number", "icmp.mip.seq", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}}, { &hf_icmp_mip_life, { "Registration Lifetime", "icmp.mip.life", FT_UINT16, BASE_DEC, NULL, 0x0, "", HFILL}}, { &hf_icmp_mip_flags, { "Flags", "icmp.mip.flags", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL}}, { &hf_icmp_mip_r, { "Registration Required", "icmp.mip.r", FT_BOOLEAN, 8, NULL, 128, "Registration with this FA is required", HFILL }}, { &hf_icmp_mip_b, { "Busy", "icmp.mip.b", FT_BOOLEAN, 8, NULL, 64, "This FA will not accept requests at this time", HFILL }}, { &hf_icmp_mip_h, { "Home Agent", "icmp.mip.h", FT_BOOLEAN, 8, NULL, 32, "Home Agent Services Offered", HFILL }}, { &hf_icmp_mip_f, { "Foreign Agent", "icmp.mip.f", FT_BOOLEAN, 8, NULL, 16, "Foreign Agent Services Offered", HFILL }}, { &hf_icmp_mip_m, { "Minimal Encapsulation", "icmp.mip.m", FT_BOOLEAN, 8, NULL, 8, "Minimal encapsulation tunneled datagram support", HFILL }}, { &hf_icmp_mip_g, { "GRE", "icmp.mip.g", FT_BOOLEAN, 8, NULL, 4, "GRE encapsulated tunneled datagram support", HFILL }}, { &hf_icmp_mip_v, { "VJ Comp", "icmp.mip.v", FT_BOOLEAN, 8, NULL, 2, "Van Jacobson Header Compression Support", HFILL }}, { &hf_icmp_mip_res, { "Reserved", "icmp.mip.res", FT_BOOLEAN, 8, NULL, 1, "Reserved", HFILL }}, { &hf_icmp_mip_reserved, { "Reserved", "icmp.mip.reserved", FT_UINT8, BASE_HEX, NULL, 0x0, "", HFILL}}, { &hf_icmp_mip_coa, { "Care-Of-Address", "icmp.mip.coa", FT_IPv4, BASE_NONE, NULL, 0x0, "", HFILL}}, { &hf_icmp_mip_challenge, { "Challenge", "icmp.mip.challenge", FT_BYTES, BASE_NONE, NULL, 0x0, "", HFILL}}, { &hf_icmp_mpls, { "ICMP Extensions for MPLS", "icmp.mpls", FT_NONE, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_version, { "Version", "icmp.mpls.version", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_reserved, { "Reserved", "icmp.mpls.res", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_checksum, { "Checksum", "icmp.mpls.checksum", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_checksum_bad, { "Bad Checksum", "icmp.mpls.checksum_bad", FT_BOOLEAN, BASE_NONE, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_length, { "Length", "icmp.mpls.length", FT_UINT16, BASE_HEX, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_class, { "Class", "icmp.mpls.class", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_c_type, { "C-Type", "icmp.mpls.ctype", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }}, { &hf_icmp_mpls_label, { "Label", "icmp.mpls.label", FT_UINT24, BASE_DEC, NULL, 0x00fffff0, "", HFILL }}, { &hf_icmp_mpls_exp, { "Experimental", "icmp.mpls.exp", FT_UINT24, BASE_DEC, NULL, 0x0e, "", HFILL }}, { &hf_icmp_mpls_s, { "Stack bit", "icmp.mpls.s", FT_BOOLEAN, 24, TFS(&flags_set_truth), 0x01, "", HFILL }}, { &hf_icmp_mpls_ttl, { "Time to live", "icmp.mpls.ttl", FT_UINT8, BASE_DEC, NULL, 0x0, "", HFILL }} }; static gint *ett[] = { &ett_icmp, &ett_icmp_mip, &ett_icmp_mip_flags, /* MPLS extensions */ &ett_icmp_mpls, &ett_icmp_mpls_object, &ett_icmp_mpls_stack_object }; module_t *icmp_module; proto_icmp = proto_register_protocol("Internet Control Message Protocol", "ICMP", "icmp"); proto_register_field_array(proto_icmp, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); icmp_module = prefs_register_protocol(proto_icmp, NULL); prefs_register_bool_preference(icmp_module, "favor_icmp_mpls", "Favor ICMP extensions for MPLS", "Whether the 128th and following bytes of the ICMP payload should be decoded as MPLS extensions or as a portion of the original packet", &favor_icmp_mpls_ext); } void proto_reg_handoff_icmp(void) { dissector_handle_t icmp_handle; /* * Get handle for the IP dissector. */ ip_handle = find_dissector("ip"); icmp_handle = create_dissector_handle(dissect_icmp, proto_icmp); dissector_add("ip.proto", IP_PROTO_ICMP, icmp_handle); } static void dissectOptical(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) { proto_tree *ip_tree = NULL, *field_tree; proto_item *ti = NULL, *tf; guint32 addr; int offset = 0; guint hlen, optlen; guint16 flags; guint8 nxt; guint16 ipsum; fragment_data *ipfd_head=NULL; tvbuff_t *next_tvb; gboolean update_col_info = TRUE; gboolean save_fragmented; static e_ip eip_arr[4]; static int eip_current=0; e_ip *iph; const guchar *src_addr, *dst_addr; guint32 src32, dst32; proto_tree *tree; proto_item *item; if (check_col(pinfo->cinfo, COL_PROTOCOL)) col_set_str(pinfo->cinfo, COL_PROTOCOL, "Optical Ethernet"); if (check_col(pinfo->cinfo, COL_INFO)) col_clear(pinfo->cinfo, COL_INFO); tree=parent_tree; eip_current++; if(eip_current==4){ eip_current=0; } iph=&eip_arr[eip_current]; iph->ip_v_hl = tvb_get_guint8(tvb, offset); hlen = lo_nibble(iph->ip_v_hl) * 4; if (tree) { ti = proto_tree_add_item(tree, proto_ip, tvb, offset, hlen, FALSE); ip_tree = proto_item_add_subtree(ti, ett_ip); proto_tree_add_uint(ip_tree, hf_ip_version, tvb, offset, 1, hi_nibble(iph->ip_v_hl)); } if (tree) { } if (tree) { proto_tree_add_uint_format(ip_tree, hf_ip_hdr_len, tvb, offset, 1, hlen, "Header length: %u bytes", hlen); } iph->ip_tos = tvb_get_guint8(tvb, offset + 1); if (tree) { if (g_ip_dscp_actif) { tf = proto_tree_add_uint_format(ip_tree, hf_ip_dsfield, tvb, offset + 1, 1, iph->ip_tos, "Class of Service field: 0x%02x (DSCP 0x%02x: %s; ECN: 0x%02x)", iph->ip_tos, IPDSFIELD_DSCP(iph->ip_tos), val_to_str(IPDSFIELD_DSCP(iph->ip_tos), dscp_vals, "Unknown DSCP"),IPDSFIELD_ECN(iph->ip_tos)); field_tree = proto_item_add_subtree(tf, ett_ip_dsfield); proto_tree_add_uint(field_tree, hf_ip_dsfield_dscp, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_uint(field_tree, hf_ip_dsfield_ect, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_uint(field_tree, hf_ip_dsfield_ce, tvb, offset + 1, 1, iph->ip_tos); } else { tf = proto_tree_add_uint_format(ip_tree, hf_ip_tos, tvb, offset + 1, 1, iph->ip_tos, "Class of service: 0x%02x (%s)", iph->ip_tos, val_to_str( IPTOS_TOS(iph->ip_tos), iptos_vals, "Unknown") ); field_tree = proto_item_add_subtree(tf, ett_ip_tos); proto_tree_add_uint(field_tree, hf_ip_tos_precedence, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_delay, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_throughput, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_reliability, tvb, offset + 1, 1, iph->ip_tos); proto_tree_add_boolean(field_tree, hf_ip_tos_cost, tvb, offset + 1, 1, iph->ip_tos); } } /* Length of IP datagram. XXX - what if this is greater than the reported length of the tvbuff? This could happen, for example, in an IP datagram inside an ICMP datagram; we need to somehow let the dissector we call know that, as it might want to avoid doing its checksumming. */ iph->ip_len = tvb_get_ntohs(tvb, offset + 2); /* Adjust the length of this tvbuff to include only the IP datagram. */ set_actual_length(tvb, iph->ip_len); /* Length of IP datagram. XXX - what if this is greater than the reported length of the tvbuff? This could happen, for example, in an IP datagram inside an ICMP datagram; we need to somehow let the dissector we call know that, as it might want to avoid doing its checksumming. */ iph->ip_len = tvb_get_ntohs(tvb, offset + 2); if (tree) proto_tree_add_uint(ip_tree, hf_ip_len, tvb, offset + 2, 2, iph->ip_len); iph->ip_p = tvb_get_guint8(tvb, offset + 9); if (tree) { proto_tree_add_uint_format(ip_tree, hf_ip_proto, tvb, offset + 9, 1, iph->ip_p, "Protocol: %s (0x%02x)", "Optical Ethernet", iph->ip_p);/*Optical ethernet in place of ippotostr?*/ } iph->ip_sum = tvb_get_ntohs(tvb, offset + 10); /* * If we have the entire IP header available, check the checksum. */ if (tvb_bytes_exist(tvb, offset, hlen)) { ipsum = ip_checksum(tvb_get_ptr(tvb, offset, hlen), hlen); if (tree) { if (ipsum == 0) { proto_tree_add_uint_format(ip_tree, hf_ip_checksum, tvb, offset + 10, 2, iph->ip_sum, "Header checksum: 0x%04x [correct]", iph->ip_sum); } else { proto_tree_add_uint_format(ip_tree, hf_ip_checksum, tvb, offset + 10, 2, iph->ip_sum, "Header checksum: 0x%04x [incorrect, should be 0x%04x]", iph->ip_sum, in_cksum_shouldbe(iph->ip_sum, ipsum)); item = proto_tree_add_boolean(ip_tree, hf_ip_checksum_bad, tvb, offset + 10, 2, TRUE); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); } } } else { ipsum = 0; if (tree) proto_tree_add_uint(ip_tree, hf_ip_checksum, tvb, offset + 10, 2, iph->ip_sum); } /*Source and Destination addresses*/ src_addr = tvb_get_ptr(tvb, offset + IPH_SRC, 4); src32 = tvb_get_ntohl(tvb, offset + IPH_SRC); SET_ADDRESS(&pinfo->net_src, AT_IPv4, 4, src_addr); SET_ADDRESS(&pinfo->src, AT_IPv4, 4, src_addr); SET_ADDRESS(&iph->ip_src, AT_IPv4, 4, src_addr); if (tree) { memcpy(&addr, iph->ip_src.data, 4); if (ip_summary_in_tree) { proto_item_set_text(ti, "Optical Ethernet"); proto_item_append_text(ti, ", Src: %s (%s)", get_hostname(addr), ip_to_str(iph->ip_src.data)); } proto_tree_add_ipv4(ip_tree, hf_ip_src, tvb, offset + 12, 4, addr); item = proto_tree_add_ipv4(ip_tree, hf_ip_addr, tvb, offset + 12, 4, addr); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_src_host, tvb, offset + 12, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_host, tvb, offset + 12, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); } dst_addr = tvb_get_ptr(tvb, offset + IPH_DST, 4); dst32 = tvb_get_ntohl(tvb, offset + IPH_DST); SET_ADDRESS(&pinfo->net_dst, AT_IPv4, 4, dst_addr); SET_ADDRESS(&pinfo->dst, AT_IPv4, 4, dst_addr); SET_ADDRESS(&iph->ip_dst, AT_IPv4, 4, dst_addr); if (tree) { memcpy(&addr, iph->ip_dst.data, 4); if (ip_summary_in_tree) { proto_item_append_text(ti, ", Dst: %s (%s)", get_hostname(addr), ip_to_str(iph->ip_dst.data)); } proto_tree_add_ipv4(ip_tree, hf_ip_dst, tvb, offset + 16, 4, addr); item = proto_tree_add_ipv4(ip_tree, hf_ip_addr, tvb, offset + 16, 4, addr); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_dst_host, tvb, offset + 16, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); item = proto_tree_add_string(ip_tree, hf_ip_host, tvb, offset + 16, 4, get_hostname(addr)); PROTO_ITEM_SET_GENERATED(item); PROTO_ITEM_SET_HIDDEN(item); } /*TLS header*/ guint8 tlsver = tvb_get_guint8(tvb, 20); int multicast = (tlsver & 0x2); int datacontrolbit = (tlsver & 0x1); tlsver = (tlsver & 0xfc); if (tree) { proto_tree_add_uint(ip_tree, hf_tls_tlsver, tvb, 20, 1, tlsver); } if (tree) { proto_tree_add_boolean(ip_tree, hf_tls_flags1, tvb, 20,1, multicast); proto_tree_add_boolean(ip_tree, hf_tls_flags2, tvb, 20,1, datacontrolbit); } guint16 MSG_CODE = tvb_get_ntohs(tvb,21); if (tree) { proto_tree_add_boolean(ip_tree, hf_tls_MSG_CODE, tvb, 21, 2, MSG_CODE); } guint32 TDI = tvb_get_ntoh24(tvb,23); if (tree) { proto_tree_add_boolean(ip_tree, hf_tls_TDI, tvb, 23, 3, TDI); } //set_actual_length(tvb, iph->ip_len); static dissector_handle_t eth_handle; eth_handle = find_dissector("eth"); int available_length = tvb_length(tvb) - 26;/*20 for the ip header and 6 for the TLS*/ int reported_length = tvb_length(tvb) - 26;//hlen-26; next_tvb = tvb_new_subset( tvb, 26, -6, -6 ); call_dissector(eth_handle, next_tvb, pinfo,parent_tree); }
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