diff options
Diffstat (limited to 'libnet/src/libnet_build_mpls.c')
| -rw-r--r-- | libnet/src/libnet_build_mpls.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/libnet/src/libnet_build_mpls.c b/libnet/src/libnet_build_mpls.c new file mode 100644 index 0000000..48c1a3e --- /dev/null +++ b/libnet/src/libnet_build_mpls.c @@ -0,0 +1,99 @@ +/* + * $Id: libnet_build_mpls.c,v 1.10 2004/04/13 17:32:28 mike Exp $ + * + * libnet + * libnet_build_mpls.c - MPLS packet assembler + * + * Copyright (c) 1998 - 2004 Mike D. Schiffman <mike@infonexus.com> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + */ + +#if (HAVE_CONFIG_H) +#include "../include/config.h" +#endif +#if (!(_WIN32) || (__CYGWIN__)) +#include "../include/libnet.h" +#else +#include "../include/win32/libnet.h" +#endif + +libnet_ptag_t +libnet_build_mpls(u_int32_t label, u_int8_t experimental, u_int8_t bos, +u_int8_t ttl, u_int8_t *payload, u_int32_t payload_s, libnet_t *l, +libnet_ptag_t ptag) +{ + u_int32_t n, h; + libnet_pblock_t *p; + struct libnet_mpls_hdr mpls_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_MPLS_H + payload_s; + h = 0; + + /* + * Find the existing protocol block if a ptag is specified, or create + * a new one. + */ + p = libnet_pblock_probe(l, ptag, n, LIBNET_PBLOCK_MPLS_H); + if (p == NULL) + { + return (-1); + } + + memset(&mpls_hdr, 0, sizeof(mpls_hdr)); + mpls_hdr.mpls_les = htonl((((label & 0x000fffff) << 12) | + ((experimental & 0x07) << 9) | + ((bos & 0x01) << 8) | + ((ttl & 0xff)))); + + n = libnet_pblock_append(l, p, (u_int8_t *)&mpls_hdr, LIBNET_MPLS_H); + if (n == -1) + { + goto bad; + } + + /* boilerplate payload sanity check / append macro */ + LIBNET_DO_PAYLOAD(l, p); + + /* + * The link offset is actually 4 bytes further into the header than + * before (the MPLS header adds this 4 bytes). We need to update the + * link offset pointer. XXX - should we set this here? + * Probably not. We should make pblock_coalesce check the pblock type + * and adjust accordingly. + */ + l->link_offset += 4; + + return (ptag ? ptag : libnet_pblock_update(l, p, h, LIBNET_PBLOCK_MPLS_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + +/* EOF */ |