suricata
decode-ipv6.h
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1 /* Copyright (C) 2007-2013 Open Information Security Foundation
2  *
3  * You can copy, redistribute or modify this Program under the terms of
4  * the GNU General Public License version 2 as published by the Free
5  * Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * version 2 along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15  * 02110-1301, USA.
16  */
17 
18 /**
19  * \file
20  *
21  * \author Victor Julien <victor@inliniac.net>
22  */
23 
24 #ifndef __DECODE_IPV6_H__
25 #define __DECODE_IPV6_H__
26 
27 #define IPV6_HEADER_LEN 40
28 #define IPV6_MAXPACKET 65535 /* maximum packet size */
29 #define IPV6_MAX_OPT 40
30 
31 typedef struct IPV6Hdr_
32 {
33  union {
34  struct ip6_un1_ {
35  uint32_t ip6_un1_flow; /* 20 bits of flow-ID */
36  uint16_t ip6_un1_plen; /* payload length */
37  uint8_t ip6_un1_nxt; /* next header */
38  uint8_t ip6_un1_hlim; /* hop limit */
39  } ip6_un1;
40  uint8_t ip6_un2_vfc; /* 4 bits version, top 4 bits class */
41  } ip6_hdrun;
42 
43  union {
44  struct {
45  uint32_t ip6_src[4];
46  uint32_t ip6_dst[4];
47  } ip6_un2;
48  uint16_t ip6_addrs[16];
49  } ip6_hdrun2;
50 } IPV6Hdr;
51 
52 #define s_ip6_src ip6_hdrun2.ip6_un2.ip6_src
53 #define s_ip6_dst ip6_hdrun2.ip6_un2.ip6_dst
54 #define s_ip6_addrs ip6_hdrun2.ip6_addrs
55 
56 #define s_ip6_vfc ip6_hdrun.ip6_un2_vfc
57 #define s_ip6_flow ip6_hdrun.ip6_un1.ip6_un1_flow
58 #define s_ip6_plen ip6_hdrun.ip6_un1.ip6_un1_plen
59 #define s_ip6_nxt ip6_hdrun.ip6_un1.ip6_un1_nxt
60 #define s_ip6_hlim ip6_hdrun.ip6_un1.ip6_un1_hlim
61 
62 #define IPV6_GET_RAW_VER(ip6h) (((ip6h)->s_ip6_vfc & 0xf0) >> 4)
63 #define IPV6_GET_RAW_CLASS(ip6h) ((SCNtohl((ip6h)->s_ip6_flow) & 0x0FF00000) >> 20)
64 #define IPV6_GET_RAW_FLOW(ip6h) (SCNtohl((ip6h)->s_ip6_flow) & 0x000FFFFF)
65 #define IPV6_GET_RAW_NH(ip6h) ((ip6h)->s_ip6_nxt)
66 #define IPV6_GET_RAW_PLEN(ip6h) (SCNtohs((ip6h)->s_ip6_plen))
67 #define IPV6_GET_RAW_HLIM(ip6h) ((ip6h)->s_ip6_hlim)
68 
69 #define IPV6_SET_RAW_VER(ip6h, value) ((ip6h)->s_ip6_vfc = (((ip6h)->s_ip6_vfc & 0x0f) | (value << 4)))
70 #define IPV6_SET_RAW_NH(ip6h, value) ((ip6h)->s_ip6_nxt = (value))
71 
72 #define IPV6_SET_L4PROTO(p,proto) (p)->ip6vars.l4proto = (proto)
73 #define IPV6_SET_EXTHDRS_LEN(p,len) (p)->ip6vars.exthdrs_len = (len)
74 
75 
76 /* ONLY call these functions after making sure that:
77  * 1. p->ip6h is set
78  * 2. p->ip6h is valid (len is correct)
79  */
80 #define IPV6_GET_VER(p) \
81  IPV6_GET_RAW_VER((p)->ip6h)
82 #define IPV6_GET_CLASS(p) \
83  IPV6_GET_RAW_CLASS((p)->ip6h)
84 #define IPV6_GET_FLOW(p) \
85  IPV6_GET_RAW_FLOW((p)->ip6h)
86 #define IPV6_GET_NH(p) \
87  (IPV6_GET_RAW_NH((p)->ip6h))
88 #define IPV6_GET_PLEN(p) \
89  IPV6_GET_RAW_PLEN((p)->ip6h)
90 #define IPV6_GET_HLIM(p) \
91  (IPV6_GET_RAW_HLIM((p)->ip6h))
92 
93 #define IPV6_GET_L4PROTO(p) \
94  ((p)->ip6vars.l4proto)
95 #define IPV6_GET_EXTHDRS_LEN(p) \
96  ((p)->ip6vars.exthdrs_len)
97 
98 /** \brief get the highest proto/next header field we know */
99 //#define IPV6_GET_UPPER_PROTO(p) (p)->ip6eh.ip6_exthdrs_cnt ?
100 // (p)->ip6eh.ip6_exthdrs[(p)->ip6eh.ip6_exthdrs_cnt - 1].next : IPV6_GET_NH((p))
101 
102 /* helper structure with parsed ipv6 info */
103 typedef struct IPV6Vars_
104 {
105  uint8_t l4proto; /**< the proto after the extension headers
106  * store while decoding so we don't have
107  * to loop through the exthdrs all the time */
108  uint16_t exthdrs_len; /**< length of the exthdrs */
109 } IPV6Vars;
110 
111 #define CLEAR_IPV6_PACKET(p) do { \
112  (p)->ip6h = NULL; \
113  (p)->ip6vars.l4proto = 0; \
114  (p)->ip6vars.exthdrs_len = 0; \
115  memset(&(p)->ip6eh, 0x00, sizeof((p)->ip6eh)); \
116 } while (0)
117 
118 /* Fragment header */
119 typedef struct IPV6FragHdr_
120 {
121  uint8_t ip6fh_nxt; /* next header */
122  uint8_t ip6fh_reserved; /* reserved field */
123  uint16_t ip6fh_offlg; /* offset, reserved, and flag */
124  uint32_t ip6fh_ident; /* identification */
125 } __attribute__((__packed__)) IPV6FragHdr;
126 
127 #define IPV6_EXTHDR_GET_FH_NH(p) (p)->ip6eh.fh_nh
128 #define IPV6_EXTHDR_GET_FH_OFFSET(p) (p)->ip6eh.fh_offset
129 #define IPV6_EXTHDR_GET_FH_FLAG(p) (p)->ip6eh.fh_more_frags_set
130 #define IPV6_EXTHDR_GET_FH_ID(p) (p)->ip6eh.fh_id
131 
132 /* rfc 1826 */
133 typedef struct IPV6AuthHdr_
134 {
135  uint8_t ip6ah_nxt; /* next header */
136  uint8_t ip6ah_len; /* header length in units of 8 bytes, not
137  including first 8 bytes. */
138  uint16_t ip6ah_reserved; /* reserved for future use */
139  uint32_t ip6ah_spi; /* SECURITY PARAMETERS INDEX (SPI) */
140  uint32_t ip6ah_seq; /* sequence number */
141 } __attribute__((__packed__)) IPV6AuthHdr;
142 
143 typedef struct IPV6EspHdr_
144 {
145  uint32_t ip6esph_spi; /* SECURITY PARAMETERS INDEX (SPI) */
146  uint32_t ip6esph_seq; /* sequence number */
147 } __attribute__((__packed__)) IPV6EspHdr;
148 
149 typedef struct IPV6RouteHdr_
150 {
151  uint8_t ip6rh_nxt; /* next header */
152  uint8_t ip6rh_len; /* header length in units of 8 bytes, not
153  including first 8 bytes. */
154  uint8_t ip6rh_type; /* routing type */
155  uint8_t ip6rh_segsleft; /* segments left */
156 } __attribute__((__packed__)) IPV6RouteHdr;
157 
158 
159 /* Hop-by-Hop header and Destination Options header use options that are
160  * defined here. */
161 
162 #define IPV6OPT_PAD1 0x00
163 #define IPV6OPT_PADN 0x01
164 #define IPV6OPT_RA 0x05
165 #define IPV6OPT_JUMBO 0xC2
166 #define IPV6OPT_HAO 0xC9
167 
168 /* Home Address Option */
169 typedef struct IPV6OptHAO_
170 {
171  uint8_t ip6hao_type; /* Option type */
172  uint8_t ip6hao_len; /* Option Data len (excludes type and len) */
173  struct in6_addr ip6hao_hoa; /* Home address. */
174 } IPV6OptHAO;
175 
176 /* Router Alert Option */
177 typedef struct IPV6OptRA_
178 {
179  uint8_t ip6ra_type; /* Option type */
180  uint8_t ip6ra_len; /* Option Data len (excludes type and len) */
181  uint16_t ip6ra_value; /* Router Alert value */
182 } IPV6OptRA;
183 
184 /* Jumbo Option */
185 typedef struct IPV6OptJumbo_
186 {
187  uint8_t ip6j_type; /* Option type */
188  uint8_t ip6j_len; /* Option Data len (excludes type and len) */
189  uint32_t ip6j_payload_len; /* Jumbo Payload Length */
190 } IPV6OptJumbo;
191 
192 typedef struct IPV6HopOptsHdr_
193 {
194  uint8_t ip6hh_nxt; /* next header */
195  uint8_t ip6hh_len; /* header length in units of 8 bytes, not
196  including first 8 bytes. */
197 } __attribute__((__packed__)) IPV6HopOptsHdr;
198 
199 typedef struct IPV6DstOptsHdr_
200 {
201  uint8_t ip6dh_nxt; /* next header */
202  uint8_t ip6dh_len; /* header length in units of 8 bytes, not
203  including first 8 bytes. */
204 } __attribute__((__packed__)) IPV6DstOptsHdr;
205 
206 typedef struct IPV6GenOptHdr_
207 {
208  uint8_t type;
209  uint8_t next;
210  uint8_t len;
211  uint8_t *data;
212 } IPV6GenOptHdr;
213 
214 typedef struct IPV6ExtHdrs_
215 {
216  _Bool rh_set;
217  uint8_t rh_type;
218 
219  _Bool fh_set;
221  uint8_t fh_nh;
222 
223  uint8_t fh_prev_nh;
225 
227  uint16_t fh_data_offset;
228  uint16_t fh_data_len;
229 
230  /* In fh_offset we store the offset of this extension into the packet past
231  * the ipv6 header. We use it in defrag for creating a defragmented packet
232  * without the frag header */
233  uint16_t fh_offset;
234  uint32_t fh_id;
235 
236 } IPV6ExtHdrs;
237 
238 #define IPV6_EXTHDR_SET_FH(p) (p)->ip6eh.fh_set = TRUE
239 #define IPV6_EXTHDR_ISSET_FH(p) (p)->ip6eh.fh_set
240 #define IPV6_EXTHDR_SET_RH(p) (p)->ip6eh.rh_set = TRUE
241 #define IPV6_EXTHDR_ISSET_RH(p) (p)->ip6eh.rh_set
242 
243 void DecodeIPV6RegisterTests(void);
244 
245 #endif /* __DECODE_IPV6_H__ */
246 
uint8_t ip6rh_nxt
Definition: decode-ipv6.h:151
union IPV6Hdr_::@37 ip6_hdrun
uint8_t ip6hao_len
Definition: decode-ipv6.h:172
uint8_t ip6_un1_nxt
Definition: decode-ipv6.h:37
uint8_t ip6hh_len
Definition: decode-ipv6.h:195
void DecodeIPV6RegisterTests(void)
this function registers unit tests for IPV6 decoder
Definition: decode-ipv6.c:921
uint32_t ip6esph_spi
Definition: decode-ipv6.h:145
struct IPV6OptHAO_ IPV6OptHAO
uint8_t ip6ah_nxt
Definition: decode-ipv6.h:135
struct IPV6Hdr_::@37::ip6_un1_ ip6_un1
uint16_t ip6_addrs[16]
Definition: decode-ipv6.h:48
struct IPV6OptJumbo_ IPV6OptJumbo
uint8_t ip6dh_len
Definition: decode-ipv6.h:202
uint32_t ip6esph_seq
Definition: decode-ipv6.h:146
uint16_t exthdrs_len
Definition: decode-ipv6.h:108
uint8_t ip6fh_nxt
Definition: decode-ipv6.h:121
uint8_t ip6fh_reserved
Definition: decode-ipv6.h:122
uint32_t ip6fh_ident
Definition: decode-ipv6.h:124
struct IPV6GenOptHdr_ IPV6GenOptHdr
uint8_t ip6rh_len
Definition: decode-ipv6.h:152
uint8_t ip6ra_type
Definition: decode-ipv6.h:179
uint16_t ip6ah_reserved
Definition: decode-ipv6.h:138
uint32_t ip6_dst[4]
Definition: decode-ipv6.h:46
struct IPV6Hdr_::@38::@39 ip6_un2
uint8_t ip6hh_nxt
Definition: decode-ipv6.h:194
uint16_t ip6fh_offlg
Definition: decode-ipv6.h:123
uint16_t fh_data_len
Definition: decode-ipv6.h:228
uint8_t fh_nh
Definition: decode-ipv6.h:221
uint16_t ip6ra_value
Definition: decode-ipv6.h:181
uint16_t fh_header_offset
Definition: decode-ipv6.h:226
struct IPV6Hdr_ IPV6Hdr
uint32_t ip6ah_seq
Definition: decode-ipv6.h:140
uint8_t fh_prev_nh
Definition: decode-ipv6.h:223
uint8_t ip6_un1_hlim
Definition: decode-ipv6.h:38
uint8_t ip6j_len
Definition: decode-ipv6.h:188
uint8_t ip6dh_nxt
Definition: decode-ipv6.h:201
uint32_t ip6_un1_flow
Definition: decode-ipv6.h:35
uint32_t ip6_src[4]
Definition: decode-ipv6.h:45
uint8_t ip6j_type
Definition: decode-ipv6.h:187
_Bool fh_more_frags_set
Definition: decode-ipv6.h:220
uint32_t ip6ah_spi
Definition: decode-ipv6.h:139
uint16_t ip6_un1_plen
Definition: decode-ipv6.h:36
uint8_t ip6ah_len
Definition: decode-ipv6.h:136
struct IPV6OptRA_ IPV6OptRA
uint8_t rh_type
Definition: decode-ipv6.h:217
struct IPV6ExtHdrs_ IPV6ExtHdrs
get the highest proto/next header field we know
Definition: decode-ipv6.h:103
uint32_t ip6j_payload_len
Definition: decode-ipv6.h:189
union IPV6Hdr_::@38 ip6_hdrun2
uint8_t ip6hao_type
Definition: decode-ipv6.h:171
struct IPV6Vars_ IPV6Vars
get the highest proto/next header field we know
uint16_t fh_offset
Definition: decode-ipv6.h:233
uint8_t ip6rh_type
Definition: decode-ipv6.h:154
uint16_t fh_data_offset
Definition: decode-ipv6.h:227
uint8_t ip6rh_segsleft
Definition: decode-ipv6.h:155
uint16_t fh_prev_hdr_offset
Definition: decode-ipv6.h:224
uint8_t ip6ra_len
Definition: decode-ipv6.h:180
uint32_t fh_id
Definition: decode-ipv6.h:234
uint8_t ip6_un2_vfc
Definition: decode-ipv6.h:40
uint8_t * data
Definition: decode-ipv6.h:211
struct IPV6FragHdr_ __attribute__((__packed__)) IPV6FragHdr
DNP3 link header.
uint8_t l4proto
Definition: decode-ipv6.h:105