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packet-ip.h
1/* packet-ip.h
2 * Definitions for IP packet disassembly structures and routines
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11
12#ifndef __PACKET_IP_H__
13#define __PACKET_IP_H__
14
15#include "ws_symbol_export.h"
16#include "packet-ipv6.h"
17#include <epan/conversation.h>
18
19/*
20 * IP Version numbers, from
21 *
22 * https://www.iana.org/assignments/version-numbers/version-numbers.xhtml
23 */
24#define IP_VERSION_NUM_RESERVED 0 /* Reserved */
25#define IP_VERSION_NUM_INET 4 /* IP (IP version 4) */
26#define IP_VERSION_NUM_ST 5 /* ST Datagram Mode */
27#define IP_VERSION_NUM_INET6 6 /* IP6 (IP version 6) */
28#define IP_VERSION_NUM_TPIX 7 /* TP/IX: The Next Internet */
29#define IP_VERSION_NUM_PIP 8 /* The P Internet Protocol */
30#define IP_VERSION_NUM_TUBA 9 /* TUBA */
31
32extern const value_string ip_version_vals[];
33
34 typedef struct _ws_ip4
35{
36 uint8_t ip_ver; /* 4 */
37 uint8_t ip_tos; /* type of service */
38 uint32_t ip_len; /* total length */
39 uint16_t ip_id; /* identification */
40 uint16_t ip_off; /* fragment offset */
41 uint8_t ip_ttl; /* time-to-live */
42 uint8_t ip_proto; /* protocol */
43 uint16_t ip_sum; /* checksum */
44 address ip_src; /* source address */
45 address ip_dst; /* destination address */
46 uint32_t ip_stream; /* track conversations */
47} ws_ip4;
48
49#define WS_IP4_PTR(p) ((ws_ip4 *)(((p) && *(uint8_t *)(p) == 4) ? (p) : NULL))
50
51/* Differentiated Services Codepoint */
52#define IPDSFIELD_DSCP_MASK 0xFC
53#define IPDSFIELD_DSCP(dsfield) (((dsfield) & IPDSFIELD_DSCP_MASK) >> 2)
54
55/* Explicit Congestion Notification */
56#define IPDSFIELD_ECN_MASK 0x03
57#define IPDSFIELD_ECN(dsfield) ((dsfield) & IPDSFIELD_ECN_MASK)
58
59bool ip_try_dissect(bool heur_first, unsigned nxt, tvbuff_t *tvb,
60 packet_info *pinfo, proto_tree *tree, void *iph);
61
62/* Export the DSCP/ECN extended value-string table for other protocols */
63WS_DLL_PUBLIC value_string_ext dscp_vals_ext;
64WS_DLL_PUBLIC value_string_ext ecn_vals_ext;
65WS_DLL_PUBLIC value_string_ext dscp_short_vals_ext;
66WS_DLL_PUBLIC value_string_ext ecn_short_vals_ext;
67
68 typedef struct _ws_ip6
69{
70 uint8_t ip6_ver; /* 6 */
71 uint8_t ip6_tc; /* traffic class */
72 uint32_t ip6_flw; /* flow label */
73 uint32_t ip6_len; /* payload length */
74 uint8_t ip6_nxt; /* next header */
75 uint8_t ip6_hop; /* hop limit */
76 address ip6_src; /* source address */
77 address ip6_dst; /* destination address */
78 uint32_t ip6_stream; /* track conversations */
79} ws_ip6;
80
81#define WS_IP6_PTR(p) ((ws_ip6 *)(((p) && *(uint8_t *)(p) == 6) ? (p) : NULL))
82
83 struct ws_rthdr {
84 struct ws_ip6_rthdr hdr;
85 proto_item *ti_len;
86 proto_item *ti_type;
87 proto_item *ti_segleft;
88};
89
90typedef ws_ip6 ipv6_tap_info_t;
91
92/* Packet info for shared state between IPv6 header and extensions.
93 *
94 * frag_plen: This is the IPv6 header payload length of a fragment packet
95 * minus per-fragment *extension* headers (anything up to and including the
96 * Fragment extension header).
97 *
98 * See RFC 8200 Section 4.5:
99 * The Per-Fragment headers must consist of the IPv6 header plus any
100 * extension headers that must be processed by nodes en route to the
101 * destination, that is, all headers up to and including the Routing
102 * header if present, else the Hop-by-Hop Options header if present,
103 * else no extension headers.
104 */
105 typedef struct {
106 uint32_t jumbo_plen;
107 uint16_t ip6_plen; /* header payload length (can be zero) */
108 int frag_plen;
109 proto_tree *ipv6_tree;
110 int ipv6_item_len;
111} ipv6_pinfo_t;
112
113 ipv6_pinfo_t *p_get_ipv6_pinfo(packet_info *pinfo);
114
115 proto_tree *p_ipv6_pinfo_select_root(packet_info *pinfo, proto_tree *tree);
116
117 ipv6_pinfo_t *p_ipv6_pinfo_add_len(packet_info *pinfo, int exthdr_len);
118
119void ipv6_dissect_next(unsigned nxt, tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, ws_ip6 *iph);
120
121static inline int
122ws_ip_protocol(void *iph)
123{
124 ws_ip4 *ip4;
125 ws_ip6 *ip6;
126
127 if (iph != NULL) {
128 if ((ip4 = WS_IP4_PTR(iph)) != NULL)
129 return ip4->ip_proto;
130 if ((ip6 = WS_IP6_PTR(iph)) != NULL)
131 return ip6->ip6_nxt;
132 }
133 return -1;
134}
135
136 struct ip_analysis {
137
138 /* Initial frame starting this conversation
139 */
140 uint32_t initial_frame;
141
142 uint32_t stream;
143};
144
145WS_DLL_PUBLIC struct ip_analysis *get_ip_conversation_data(conversation_t *conv,
146 packet_info *pinfo);
147
148#endif /* __PACKET_IP_H__ */
149
150/*
151 * Editor modelines - https://www.wireshark.org/tools/modelines.html
152 *
153 * Local variables:
154 * c-basic-offset: 4
155 * tab-width: 8
156 * indent-tabs-mode: nil
157 * End:
158 *
159 * vi: set shiftwidth=4 tabstop=8 expandtab:
160 * :indentSize=4:tabSize=8:noTabs=true:
161 */
conversation.h
packet-ipv6.h
_address
Definition address.h:58
_packet_info
Definition packet_info.h:43
_proto_node
Definition proto.h:907
_value_string_ext
Extended metadata for a value_string array.
Definition value_string.h:325
_value_string
Mapping between a 32-bit integer value and its string representation.
Definition value_string.h:33
_ws_ip4
Definition packet-ip.h:35
_ws_ip6
Definition packet-ip.h:69
conversation
Definition conversation.h:230
ip_analysis
Definition packet-ip.h:136
ipv6_pinfo_t
Definition packet-ip.h:105
stream
Definition stream.c:41
tvbuff
Definition tvbuff-int.h:35
ws_ip6_rthdr
Definition packet-ipv6.h:44
ws_rthdr
Definition packet-ip.h:83