2 * netsniff-ng - the packet sniffing beast
3 * Copyright 2012 Markus Amend <markus@netsniff-ng.org>
4 * Subject to the GPL, version 2.
6 * IPv6 Destination Options Header described in RFC2460
9 #ifndef PROTO_IPV6_DEST_OPTS_H
10 #define PROTO_IPV6_DEST_OPTS_H
14 #include <netinet/in.h> /* for ntohs() */
16 #include "proto_struct.h"
17 #include "dissector_eth.h"
21 uint8_t h_next_header
;
26 static inline void dissect_opt(struct pkt_buff
*pkt
, uint8_t *opt_len
)
28 /* Have to been upgraded.
29 * http://tools.ietf.org/html/rfc2460#section-4.2
30 * Look also for proto_ipv6_hop_by_hop.h, it needs
34 tprintf(", Option(s) recognized ");
36 /* If adding dissector reduce opt_len for each using of pkt_pull
41 static inline void dest_opts(struct pkt_buff
*pkt
)
43 uint8_t hdr_ext_len
, opt_len
;
44 struct dest_optshdr
*dest_ops
;
46 dest_ops
= (struct dest_optshdr
*) pkt_pull(pkt
, sizeof(*dest_ops
));
48 /* Total Header Length in Bytes */
49 hdr_ext_len
= (dest_ops
->hdr_len
+ 1) * 8;
50 /* Options length in Bytes */
51 opt_len
= hdr_ext_len
- sizeof(*dest_ops
);
52 if (dest_ops
== NULL
|| opt_len
> pkt_len(pkt
))
55 tprintf("\t [ Destination Options ");
56 tprintf("NextHdr (%u), ", dest_ops
->h_next_header
);
57 tprintf("HdrExtLen (%u, %u Bytes)", dest_ops
->hdr_len
,
60 dissect_opt(pkt
, &opt_len
);
64 pkt_pull(pkt
, opt_len
);
65 pkt_set_proto(pkt
, ð_lay3
, dest_ops
->h_next_header
);
68 static inline void dest_opts_less(struct pkt_buff
*pkt
)
70 uint8_t hdr_ext_len
, opt_len
;
71 struct dest_optshdr
*dest_ops
;
73 dest_ops
= (struct dest_optshdr
*) pkt_pull(pkt
, sizeof(*dest_ops
));
75 /* Total Header Length in Bytes */
76 hdr_ext_len
= (dest_ops
->hdr_len
+ 1) * 8;
77 /* Options length in Bytes */
78 opt_len
= hdr_ext_len
- sizeof(*dest_ops
);
79 if (dest_ops
== NULL
|| opt_len
> pkt_len(pkt
))
84 pkt_pull(pkt
, opt_len
);
85 pkt_set_proto(pkt
, ð_lay3
, dest_ops
->h_next_header
);
88 struct protocol ipv6_dest_opts_ops
= {
90 .print_full
= dest_opts
,
91 .print_less
= dest_opts_less
,
94 #endif /* PROTO_IPV6_DEST_OPTS_H */