344 lines
11 KiB
C
344 lines
11 KiB
C
/* $FreeBSD$ */
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/* $KAME: net_osdep.h,v 1.68 2001/12/21 08:14:58 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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* glue for kernel code programming differences.
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*/
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/*
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* OS dependencies:
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* - ioctl
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* FreeBSD 3 and later warn when sys/ioctl.h is included in a kernel source
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* file. For socket ioctl, we are suggested to use sys/sockio.h.
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*
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* - RTFREE()
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* bsdi does not escape this macro using do-clause, so it is recommended
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* to escape the macro explicitly.
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* e.g.
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* if (rt) {
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* RTFREE(rt);
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* }
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*
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* - whether the IPv4 input routine convert the byte order of some fileds
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* of the IP header (x: convert to the host byte order, s: strip the header
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* length for possible reassembly)
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* ip_len ip_id ip_off
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* bsdi3: xs x x
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* bsdi4: xs x
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* freebsd[23]: xs x x
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* freebsd4: xs x
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* NetBSD: x x
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* OpenBSD: xs x x
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*
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* - ifa_ifwithaf()
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* bsdi[34], netbsd, and openbsd define it in sys/net/if.c
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* freebsd (all versions) does not have it.
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*
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* - struct rt_addrinfo
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* bsdi4, netbsd 1.5R and beyond: rti_addrs, rti_info[], rti_flags, rti_ifa,
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* rti_ifp, and rti_rtm.
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* others: rti_addrs and rti_info[] only.
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*
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* - ifa->ifa_rtrequest
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* bsdi4, netbsd 1.5R and beyond: rt_addrinfo *
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* others: sockaddr * (note that sys/net/route.c:rtrequest() has an unsafe
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* typecast code, from 4.3BSD-reno)
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*
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* - side effects of rtrequest{,1}(RTM_DELETE)
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* BSDI[34]: delete all cloned routes underneath the route.
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* FreeBSD[234]: delete all protocol-cloned routes underneath the route.
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* note that cloned routes from an interface direct route
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* still remain.
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* NetBSD: 1.5 have no side effects. KAME/netbsd15, and post-1.5R, have
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* the same effects as of BSDI.
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* OpenBSD: have no side effects. KAME/openbsd has the same effects as
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* of BSDI (the change is not merged - yet).
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*
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* - privileged process
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* NetBSD, FreeBSD 3
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* struct proc *p;
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* if (p && !suser(p->p_ucred, &p->p_acflag))
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* privileged;
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* FreeBSD 4
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* struct proc *p;
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* if (p && !suser(p))
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* privileged;
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* FreeBSD 5
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* struct thread *td;
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* if (suser(td))
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* privileged;
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* OpenBSD, BSDI [34], FreeBSD 2
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* struct socket *so;
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* if (so->so_state & SS_PRIV)
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* privileged;
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* - foo_control
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* NetBSD, FreeBSD 3
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* needs to give struct proc * as argument
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* OpenBSD, BSDI [34], FreeBSD 2
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* do not need struct proc *
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*
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* - bpf:
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* OpenBSD, NetBSD 1.5, BSDI [34]
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* need caddr_t * (= if_bpf **) and struct ifnet *
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* FreeBSD 2, FreeBSD 3, NetBSD post-1.5N
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* need only struct ifnet * as argument
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*
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* - struct ifnet
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* use queue.h? member names if name
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* --- --- ---
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* FreeBSD 2 no old standard if_name+unit
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* FreeBSD 3 yes strange if_name+unit
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* OpenBSD yes standard if_xname
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* NetBSD yes standard if_xname
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* BSDI [34] no old standard if_name+unit
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*
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* - usrreq
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* NetBSD, OpenBSD, BSDI [34], FreeBSD 2
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* single function with PRU_xx, arguments are mbuf
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* FreeBSD 3
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* separates functions, non-mbuf arguments
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*
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* - {set,get}sockopt
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* NetBSD, OpenBSD, BSDI [34], FreeBSD 2
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* manipulation based on mbuf
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* FreeBSD 3
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* non-mbuf manipulation using sooptcopy{in,out}()
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*
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* - timeout() and untimeout()
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* NetBSD 1.4.x, OpenBSD, BSDI [34], FreeBSD 2
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* timeout() is a void function
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* FreeBSD 3
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* timeout() is non-void, must keep returned value for untimeout()
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* callout_xx is also available (sys/callout.h)
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* NetBSD 1.5
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* timeout() is obsoleted, use callout_xx (sys/callout.h)
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* OpenBSD 2.8
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* timeout_{add,set,del} is encouraged (sys/timeout.h)
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*
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* - kernel internal time structure
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* FreeBSD 2, NetBSD, OpenBSD, BSD/OS
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* mono_time.tv_u?sec, time.tv_u?sec
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* FreeBSD [34]
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* time_second
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* if you need portability, #ifdef out FreeBSD[34], or use microtime(&tv)
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* then touch tv.tv_sec (note: microtime is an expensive operation).
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*
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* - sysctl
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* NetBSD, OpenBSD
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* foo_sysctl()
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* BSDI [34]
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* foo_sysctl() but with different style. sysctl_int_arr() takes
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* care of most of the cases.
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* FreeBSD
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* linker hack. however, there are freebsd version differences
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* (how wonderful!).
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* on FreeBSD[23] function arg #define includes paren.
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* int foo SYSCTL_HANDLER_ARGS;
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* on FreeBSD4, function arg #define does not include paren.
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* int foo(SYSCTL_HANDLER_ARGS);
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* on some versions, forward reference to the tree is okay.
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* on some versions, you need SYSCTL_DECL(). you need things
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* like this.
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* #ifdef SYSCTL_DECL
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* SYSCTL_DECL(net_inet_ip6);
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* #endif
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* it is hard to share functions between freebsd and non-freebsd.
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*
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* - if_ioctl
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* NetBSD, FreeBSD 3, BSDI [34]
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* 2nd argument is u_long cmd
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* FreeBSD 2
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* 2nd argument is int cmd
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*
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* - if attach routines
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* NetBSD
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* void xxattach(int);
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* FreeBSD 2, FreeBSD 3
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* void xxattach(void *);
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* PSEUDO_SET(xxattach, if_xx);
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*
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* - ovbcopy()
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* in NetBSD 1.4 or later, ovbcopy() is not supplied in the kernel.
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* we have updated sys/systm.h to include declaration.
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*
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* - splnet()
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* NetBSD 1.4 or later requires splsoftnet().
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* other operating systems use splnet().
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*
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* - splimp()
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* NetBSD-current (2001/4/13): use splnet() in network, splvm() in vm.
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* other operating systems: use splimp().
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*
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* - dtom()
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* NEVER USE IT!
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*
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* - struct ifnet for loopback interface
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* BSDI3: struct ifnet loif;
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* BSDI4: struct ifnet *loifp;
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* NetBSD, OpenBSD 2.8, FreeBSD2: struct ifnet loif[NLOOP];
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* OpenBSD 2.9: struct ifnet *lo0ifp;
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*
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* odd thing is that many of them refers loif as ifnet *loif,
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* not loif[NLOOP], from outside of if_loop.c.
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*
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* - number of bpf pseudo devices
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* others: bpfilter.h, NBPFILTER
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* FreeBSD4: bpf.h, NBPF
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* solution:
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* #if defined(__FreeBSD__) && __FreeBSD__ >= 4
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* #include "bpf.h"
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* #define NBPFILTER NBPF
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* #else
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* #include "bpfilter.h"
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* #endif
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*
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* - protosw for IPv4 (sys/netinet)
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* FreeBSD4: struct ipprotosw in netinet/ipprotosw.h
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* others: struct protosw in sys/protosw.h
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*
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* - protosw in general.
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* NetBSD 1.5 has extra member for ipfilter (netbsd-current dropped
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* it so it will go away in 1.6).
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* NetBSD 1.5 requires PR_LISTEN flag bit with protocols that permit
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* listen/accept (like tcp).
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*
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* - header files with defopt (opt_xx.h)
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* FreeBSD3: opt_{inet,ipsec,ip6fw,altq}.h
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* FreeBSD4: opt_{inet,inet6,ipsec,ip6fw,altq}.h
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* NetBSD: opt_{inet,ipsec,altq}.h
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* others: does not use defopt
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*
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* - IN_MULTICAST/IN_CLASS[A-D] macro.
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* OpenBSD and NetBSD: net endian (kernel) or host endian (userland)
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* others: always host endian
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*
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* - (m->m_flags & M_EXT) != 0 does *not* mean that the max data length of
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* the mbuf == MCLBYTES.
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*
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* - sys/kern/uipc_mbuf.c:m_dup()
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* freebsd[34]: copies the whole mbuf chain.
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* netbsd: similar arg with m_copym().
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* others: no m_dup().
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*
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* - ifa_refcnt (struct ifaddr) management (IFAREF/IFAFREE).
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* NetBSD 1.5: always use IFAREF whenever reference gets added.
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* always use IFAFREE whenever reference gets freed.
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* IFAFREE frees ifaddr when ifa_refcnt reaches 0.
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* others: do not increase refcnt for ifp->if_addrlist and in_ifaddr.
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* use IFAFREE once when ifaddr is disconnected from
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* ifp->if_addrlist and in_ifaddr. IFAFREE frees ifaddr when
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* ifa_refcnt goes negative. in KAME environment, IFAREF is
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* provided as a compatibility wrapper (use it instead of
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* ifa_refcnt++ to reduce #ifdef).
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*
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* - ifnet.if_lastchange
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* freebsd, bsdi, netbsd-current (jun 14 2001-),
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* openbsd-current (jun 15 2001-): updated only when IFF_UP changes.
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* (RFC1573 ifLastChange interpretation)
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* netbsd151, openbsd29: updated whenever packets go through the interface.
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* (4.4BSD interpretation)
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*
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* - kernel compilation options ("options HOGE" in kernel config file)
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* freebsd4: sys/conf/options has to have mapping between option
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* and a header file (opt_hoge.h).
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* netbsd: by default, -DHOGE will go into
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* sys/arch/foo/compile/BAR/Makefile.
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* if you define mapping in sys/conf/files, you can create
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* a header file like opt_hoge.h to help make dependencies.
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* bsdi/openbsd: always use -DHOGE in Makefile. there's no need/way
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* to have opt_hoge.h.
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*
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* therefore, opt_hoge.h is mandatory on freebsd4 only.
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*
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* - MALLOC() macro
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* Use it only if the size of the allocation is constant.
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* When we do NOT collect statistics about kernel memory usage, the result
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* of macro expansion contains a large set of condition branches. If the
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* size is not constant, compilation optimization cannot be applied, and
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* a bunch of the large branch will be embedded in the kernel code.
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*
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* - M_COPY_PKTHDR
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* openbsd30: M_COPY_PKTHDR is deprecated. use M_MOVE_PKTHDR or
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* M_DUP_PKTHDR, depending on how you want to handle m_tag.
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* others: M_COPY_PKTHDR is available as usual.
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*/
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#ifndef __NET_NET_OSDEP_H_DEFINED_
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#define __NET_NET_OSDEP_H_DEFINED_
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#ifdef _KERNEL
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struct ifnet;
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extern const char *if_name(struct ifnet *);
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#define HAVE_OLD_BPF
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#define ifa_list ifa_link
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#define if_addrlist if_addrhead
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#define if_list if_link
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/* sys/net/if.h */
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#define IFAREF(ifa) do { ++(ifa)->ifa_refcnt; } while (0)
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#define WITH_CONVERT_AND_STRIP_IP_LEN
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#if 1 /* at this moment, all OSes do this */
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#define WITH_CONVERT_IP_OFF
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#endif
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/*
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* Deprecated.
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*/
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#include <sys/module.h>
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#define PSEUDO_SET(sym, name) \
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static int name ## _modevent(module_t mod, int type, void *data) \
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{ \
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void (*initfunc)(void *) = (void (*)(void *))data; \
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switch (type) { \
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case MOD_LOAD: \
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/* printf(#name " module load\n"); */ \
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initfunc(NULL); \
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break; \
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case MOD_UNLOAD: \
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printf(#name " module unload - not possible for this module type\n"); \
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return EINVAL; \
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} \
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return 0; \
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} \
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static moduledata_t name ## _mod = { \
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#name, \
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name ## _modevent, \
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(void *)sym \
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}; \
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DECLARE_MODULE(name, name ## _mod, SI_SUB_PSEUDO, SI_ORDER_ANY)
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#endif /*_KERNEL*/
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#endif /*__NET_NET_OSDEP_H_DEFINED_ */
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