100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
/* $OpenBSD: mpls_shim.c,v 1.8 2014/12/05 15:50:04 mpi Exp $ */
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/*
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* Copyright (C) 1999, 2000 and 2001 AYAME Project, WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include <sys/errno.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <netmpls/mpls.h>
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struct mbuf *
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mpls_shim_pop(struct mbuf *m)
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{
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/* shaves off top shim header from mbuf */
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m_adj(m, sizeof(struct shim_hdr));
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/* catch-up next shim_hdr */
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if (m->m_len < sizeof(struct shim_hdr))
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if ((m = m_pullup(m, sizeof(struct shim_hdr))) == NULL)
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return (NULL);
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/* return mbuf */
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return (m);
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}
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struct mbuf *
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mpls_shim_swap(struct mbuf *m, struct rt_mpls *rt_mpls)
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{
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struct shim_hdr *shim;
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/* pullup shim_hdr */
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if (m->m_len < sizeof(struct shim_hdr))
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if ((m = m_pullup(m, sizeof(struct shim_hdr))) == NULL)
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return (NULL);
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shim = mtod(m, struct shim_hdr *);
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/* swap label */
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shim->shim_label &= ~MPLS_LABEL_MASK;
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shim->shim_label |= rt_mpls->mpls_label & MPLS_LABEL_MASK;
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/* swap exp : XXX exp override */
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{
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u_int32_t t;
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shim->shim_label &= ~MPLS_EXP_MASK;
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t = rt_mpls->mpls_exp << MPLS_EXP_OFFSET;
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shim->shim_label |= htonl(t) & MPLS_EXP_MASK;
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}
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return (m);
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}
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struct mbuf *
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mpls_shim_push(struct mbuf *m, struct rt_mpls *rt_mpls)
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{
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struct shim_hdr *shim;
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M_PREPEND(m, sizeof(struct shim_hdr), M_DONTWAIT);
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if (m == NULL)
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return (NULL);
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shim = mtod(m, struct shim_hdr *);
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bzero((caddr_t)shim, sizeof(*shim));
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return (mpls_shim_swap(m, rt_mpls));
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}
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