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Diffstat (limited to 'src/libnet_build_802.1q.c')
| -rw-r--r-- | src/libnet_build_802.1q.c | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/src/libnet_build_802.1q.c b/src/libnet_build_802.1q.c new file mode 100644 index 0000000..6a36023 --- /dev/null +++ b/src/libnet_build_802.1q.c @@ -0,0 +1,102 @@ +/* + * $Id: libnet_build_802.1q.c,v 1.11 2004/04/13 17:32:28 mike Exp $ + * + * libnet + * libnet_build_802.1q.c - 802.1q 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_802_1q(const uint8_t *dst, const uint8_t *src, uint16_t tpi, +uint8_t priority, uint8_t cfi, uint16_t vlan_id, uint16_t len_proto, +const uint8_t* payload, uint32_t payload_s, libnet_t *l, libnet_ptag_t ptag) +{ + uint32_t n, h; + libnet_pblock_t *p; + struct libnet_802_1q_hdr _802_1q_hdr; + + if (l == NULL) + { + return (-1); + } + + n = LIBNET_802_1Q_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_802_1Q_H); + if (p == NULL) + { + return (-1); + } + + memset(&_802_1q_hdr, 0, sizeof(_802_1q_hdr)); + memcpy(_802_1q_hdr.vlan_dhost, dst, ETHER_ADDR_LEN); + memcpy(_802_1q_hdr.vlan_shost, src, ETHER_ADDR_LEN); + _802_1q_hdr.vlan_tpi = htons(tpi); + _802_1q_hdr.vlan_priority_c_vid = htons((priority << 13) | (cfi << 12) + | (vlan_id & LIBNET_802_1Q_VIDMASK)); + _802_1q_hdr.vlan_len = htons(len_proto); + + n = libnet_pblock_append(l, p, (uint8_t *)&_802_1q_hdr, LIBNET_802_1Q_H); + if (n == (uint32_t)-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 VLAN 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_802_1Q_H)); +bad: + libnet_pblock_delete(l, p); + return (-1); +} + + +/* EOF */ |