151 lines
4.5 KiB
C
151 lines
4.5 KiB
C
/* $NetBSD: if_gif.h,v 1.35 2020/02/01 02:57:45 riastradh Exp $ */
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/* $KAME: if_gif.h,v 1.23 2001/07/27 09:21:42 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 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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* 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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/*
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* if_gif.h
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*/
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#ifndef _NET_IF_GIF_H_
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#define _NET_IF_GIF_H_
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#include <sys/queue.h>
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#include <sys/percpu.h>
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#ifdef _KERNEL
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#include <sys/pserialize.h>
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#include <sys/psref.h>
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#endif
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#ifdef _KERNEL_OPT
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#include "opt_inet.h"
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#endif
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#include <netinet/in.h>
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/* xxx sigh, why route have struct route instead of pointer? */
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extern struct psref_class *gv_psref_class;
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struct encaptab;
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struct gif_variant {
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struct gif_softc *gv_softc;
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struct sockaddr *gv_psrc; /* Physical src addr */
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struct sockaddr *gv_pdst; /* Physical dst addr */
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const struct encaptab *gv_encap_cookie4;
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const struct encaptab *gv_encap_cookie6;
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int (*gv_output)(struct gif_variant *, int, struct mbuf *);
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struct psref_target gv_psref;
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};
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struct gif_softc {
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struct ifnet gif_if; /* common area - must be at the top */
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percpu_t *gif_ro_percpu; /* struct tunnel_ro */
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struct gif_variant *gif_var; /*
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* reader must use gif_getref_variant()
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* instead of direct dereference.
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*/
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kmutex_t gif_lock; /* writer lock for gif_var */
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pserialize_t gif_psz;
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int gif_pmtu;
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LIST_ENTRY(gif_softc) gif_list; /* list of all gifs */
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};
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#define GIF_ROUTE_TTL 10
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#define GIF_MTU (1280) /* Default MTU */
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#define GIF_MTU_MIN (1280) /* Minimum MTU */
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#define GIF_MTU_MAX (8192) /* Maximum MTU */
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/*
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* Get gif_variant from gif_softc.
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*
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* Never return NULL by contract.
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* gif_variant itself is protected not to be freed by gv_psref.
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* Once a reader dereference sc->sc_var by this API, the reader must not
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* re-dereference form sc->sc_var.
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*/
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static __inline struct gif_variant *
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gif_getref_variant(struct gif_softc *sc, struct psref *psref)
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{
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struct gif_variant *var;
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int s;
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s = pserialize_read_enter();
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var = atomic_load_consume(&sc->gif_var);
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KASSERT(var != NULL);
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psref_acquire(psref, &var->gv_psref, gv_psref_class);
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pserialize_read_exit(s);
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return var;
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}
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static __inline void
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gif_putref_variant(struct gif_variant *var, struct psref *psref)
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{
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KASSERT(var != NULL);
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psref_release(psref, &var->gv_psref, gv_psref_class);
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}
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static __inline bool
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gif_heldref_variant(struct gif_variant *var)
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{
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return psref_held(&var->gv_psref, gv_psref_class);
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}
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/* Prototypes */
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void gif_input(struct mbuf *, int, struct ifnet *);
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#ifdef GIF_ENCAPCHECK
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int gif_encapcheck(struct mbuf *, int, int, void *);
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#endif
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/*
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* Locking notes:
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* + gif_softc_list is protected by gif_softcs.lock (an adaptive mutex)
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* gif_softc_list is list of all gif_softcs. It is used by ioctl
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* context only.
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* + gif_softc->gif_var is protected by
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* - gif_softc->gif_lock (an adaptive mutex) for writer
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* - gif_var->gv_psref for reader
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* gif_softc->gif_var is used for variant values while the gif tunnel
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* exists.
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* + Each CPU's tunnel_ro.tr_ro of gif_ro_percpu are protected by
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* percpu'ed tunnel_ro.tr_lock.
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*
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* Locking order:
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* - encap_lock => gif_softc->gif_lock => gif_softcs.lock
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*/
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#endif /* !_NET_IF_GIF_H_ */
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