/* * netsniff-ng - the packet sniffing beast * Copyright 2012 Markus Amend , Deutsche Flugsicherung GmbH * Subject to the GPL, version 2. * * IPv6 Destination Options Header described in RFC2460 */ #include #include #include /* for ntohs() */ #include "proto.h" #include "dissector_eth.h" #include "built_in.h" #include "pkt_buff.h" struct dest_optshdr { uint8_t h_next_header; uint8_t hdr_len; } __packed; static void dissect_opt_dest(struct pkt_buff *pkt __maybe_unused, ssize_t *opt_len) { /* Have to been upgraded. * http://tools.ietf.org/html/rfc2460#section-4.2 * Look also for proto_ipv6_hop_by_hop.h, it needs * dissect_opt(), too. */ if (*opt_len) tprintf(", Option(s) recognized "); /* If adding dissector reduce opt_len for each using of pkt_pull * to the same size. */ } static void dest_opts(struct pkt_buff *pkt) { uint16_t hdr_ext_len; ssize_t opt_len; struct dest_optshdr *dest_ops; dest_ops = (struct dest_optshdr *) pkt_pull(pkt, sizeof(*dest_ops)); if (dest_ops == NULL) return; /* Total Header Length in Bytes */ hdr_ext_len = (dest_ops->hdr_len + 1) * 8; /* Options length in Bytes */ opt_len = hdr_ext_len - sizeof(*dest_ops); tprintf("\t [ Destination Options "); tprintf("NextHdr (%u), ", dest_ops->h_next_header); if (opt_len > pkt_len(pkt) || opt_len < 0) { tprintf("HdrExtLen (%u, %u Bytes, %s)", dest_ops->hdr_len, hdr_ext_len, colorize_start_full(black, red) "invalid" colorize_end()); return; } tprintf("HdrExtLen (%u, %u Bytes)", dest_ops->hdr_len, hdr_ext_len); dissect_opt_dest(pkt, &opt_len); tprintf(" ]\n"); pkt_pull(pkt, opt_len); pkt_set_dissector(pkt, ð_lay3, dest_ops->h_next_header); } static void dest_opts_less(struct pkt_buff *pkt) { uint16_t hdr_ext_len; ssize_t opt_len; struct dest_optshdr *dest_ops; dest_ops = (struct dest_optshdr *) pkt_pull(pkt, sizeof(*dest_ops)); if (dest_ops == NULL) return; /* Total Header Length in Bytes */ hdr_ext_len = (dest_ops->hdr_len + 1) * 8; /* Options length in Bytes */ opt_len = hdr_ext_len - sizeof(*dest_ops); if (opt_len > pkt_len(pkt) || opt_len < 0) return; tprintf(" Dest Ops"); pkt_pull(pkt, opt_len); pkt_set_dissector(pkt, ð_lay3, dest_ops->h_next_header); } struct protocol ipv6_dest_opts_ops = { .key = 0x3C, .print_full = dest_opts, .print_less = dest_opts_less, }; txt' type='search' size='10' name='q' value=''/>
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authorAlexander Aring <alex.aring@gmail.com>2015-09-18 11:30:42 +0200
committerMarcel Holtmann <marcel@holtmann.org>2015-09-22 11:51:20 +0200
commit838b83d63d2909f9136f3030dc4fffa8230c31da (patch)
tree7efa76e2b2a2df882e4ad941ef01806ad0664e94 /net/mac802154
parenta1da67b8117ddbe88c770b48b5b1527393b8c9c0 (diff)
ieee802154: introduce wpan_dev_header_ops
The current header_ops callback structure of net device are used mostly from 802.15.4 upper-layers. Because this callback structure is a very generic one, which is also used by e.g. DGRAM AF_PACKET sockets, we can't make this callback structure 802.15.4 specific which is currently is. I saw the smallest "constraint" for calling this callback with dev_hard_header/dev_parse_header by AF_PACKET which assign a 8 byte array for address void pointers. Currently 802.15.4 specific protocols like af802154 and 6LoWPAN will assign the "struct ieee802154_addr" as these parameters which is greater than 8 bytes. The current callback implementation for header_ops.create assumes always a complete "struct ieee802154_addr" which AF_PACKET can't never handled and is greater than 8 bytes. For that reason we introduce now a "generic" create/parse header_ops callback which allows handling with intra-pan extended addresses only. This allows a small use-case with AF_PACKET to send "somehow" a valid dataframe over DGRAM. To keeping the current dev_hard_header behaviour we introduce a similar callback structure "wpan_dev_header_ops" which contains 802.15.4 specific upper-layer header creation functionality, which can be called by wpan_dev_hard_header. Signed-off-by: Alexander Aring <alex.aring@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Diffstat (limited to 'net/mac802154')