From 1a9fbac03c684f29cff9ac44875bd9504a89f54e Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Fri, 15 Mar 2013 10:41:48 +0100 Subject: all: import netsniff-ng 0.5.8-rc0 source We decided to get rid of the old Git history and start a new one for several reasons: *) Allow / enforce only high-quality commits (which was not the case for many commits in the history), have a policy that is more close to the one from the Linux kernel. With high quality commits, we mean code that is logically split into commits and commit messages that are signed-off and have a proper subject and message body. We do not allow automatic Github merges anymore, since they are total bullshit. However, we will either cherry-pick your patches or pull them manually. *) The old archive was about ~27MB for no particular good reason. This basically derived from the bad decision that also some PDF files where stored there. From this moment onwards, no binary objects are allowed to be stored in this repository anymore. The old archive is not wiped away from the Internet. You will still be able to find it, e.g. on git.cryptoism.org etc. Signed-off-by: Daniel Borkmann Signed-off-by: Tobias Klauser --- proto_ipv6_hop_by_hop.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 100 insertions(+) create mode 100644 proto_ipv6_hop_by_hop.c (limited to 'proto_ipv6_hop_by_hop.c') diff --git a/proto_ipv6_hop_by_hop.c b/proto_ipv6_hop_by_hop.c new file mode 100644 index 0000000..b0c5a0d --- /dev/null +++ b/proto_ipv6_hop_by_hop.c @@ -0,0 +1,100 @@ +/* + * netsniff-ng - the packet sniffing beast + * Copyright 2012 Markus Amend , Deutsche Flugsicherung GmbH + * Subject to the GPL, version 2. + * + * IPv6 Hop-By-Hop Header described in RFC2460 + */ + +#include +#include +#include /* for ntohs() */ + +#include "proto.h" +#include "protos.h" +#include "dissector_eth.h" +#include "built_in.h" +#include "pkt_buff.h" + +struct hop_by_hophdr { + uint8_t h_next_header; + uint8_t hdr_len; +} __packed; + +static void dissect_opt_hop (struct pkt_buff *pkt, ssize_t *opt_len) +{ + /* Have to been upgraded. + * http://tools.ietf.org/html/rfc2460#section-4.2 + * Look also for proto_ipv6_dest_opts.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 hop_by_hop(struct pkt_buff *pkt) +{ + uint16_t hdr_ext_len; + ssize_t opt_len; + struct hop_by_hophdr *hop_ops; + + hop_ops = (struct hop_by_hophdr *) pkt_pull(pkt, sizeof(*hop_ops)); + if (hop_ops == NULL) + return; + + /* Total Header Length in Bytes */ + hdr_ext_len = (hop_ops->hdr_len + 1) * 8; + /* Options length in Bytes */ + opt_len = hdr_ext_len - sizeof(*hop_ops); + + tprintf("\t [ Hop-by-Hop Options "); + tprintf("NextHdr (%u), ", hop_ops->h_next_header); + if (opt_len > pkt_len(pkt) || opt_len < 0){ + tprintf("HdrExtLen (%u, %u Bytes, %s)", hop_ops->hdr_len, + hdr_ext_len, colorize_start_full(black, red) + "invalid" colorize_end()); + return; + } + tprintf("HdrExtLen (%u, %u Bytes)", hop_ops->hdr_len, + hdr_ext_len); + + dissect_opt_hop(pkt, &opt_len); + + tprintf(" ]\n"); + + pkt_pull(pkt, opt_len); + pkt_set_proto(pkt, ð_lay3, hop_ops->h_next_header); +} + +static void hop_by_hop_less(struct pkt_buff *pkt) +{ + uint16_t hdr_ext_len; + ssize_t opt_len; + struct hop_by_hophdr *hop_ops; + + hop_ops = (struct hop_by_hophdr *) pkt_pull(pkt, sizeof(*hop_ops)); + if (hop_ops == NULL) + return; + + /* Total Header Length in Bytes */ + hdr_ext_len = (hop_ops->hdr_len + 1) * 8; + /* Options length in Bytes */ + opt_len = hdr_ext_len - sizeof(*hop_ops); + if (opt_len > pkt_len(pkt) || opt_len < 0) + return; + + tprintf(" Hop Ops"); + + pkt_pull(pkt, opt_len); + pkt_set_proto(pkt, ð_lay3, hop_ops->h_next_header); +} + +struct protocol ipv6_hop_by_hop_ops = { + .key = 0x0, + .print_full = hop_by_hop, + .print_less = hop_by_hop_less, +}; -- cgit v1.2.3-54-g00ecf