gems-kernel/source/THIRDPARTY/xnu/bsd/net/net_osdep.h
2024-06-03 11:29:39 -05:00

274 lines
9.5 KiB
C

/*
* Copyright (c) 2000-2010 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. The rights granted to you under the License
* may not be used to create, or enable the creation or redistribution of,
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
*
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* 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.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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.
*/
/*
* glue for kernel code programming differences.
*/
/*
* OS dependencies:
*
* - whether the IPv4 input routine convert the byte order of some fileds
* of the IP header (x: convert to the host byte order, s: strip the header
* length for possible reassembly)
* ip_len ip_id ip_off
* bsdi3: xs x x
* bsdi4: xs x
* FreeBSD: xs x
* NetBSD: x x
* OpenBSD: xs x x
*
* - ifa_ifwithaf()
* bsdi[34], netbsd, and openbsd define it in sys/net/if.c
* freebsd (all versions) does not have it.
*
* - struct rt_addrinfo
* bsdi4, netbsd 1.5R and beyond: rti_addrs, rti_info[], rti_flags, rti_ifa,
* rti_ifp, and rti_rtm.
* others: rti_addrs and rti_info[] only.
*
* - ifa->ifa_rtrequest
* bsdi4, netbsd 1.5R and beyond: rt_addrinfo *
* others: sockaddr * (note that sys/net/route.c:rtrequest() has an unsafe
* typecast code, from 4.3BSD-reno)
*
* - side effects of rtrequest{,1}(RTM_DELETE)
* BSDI[34]: delete all cloned routes underneath the route.
* FreeBSD[234]: delete all protocol-cloned routes underneath the route.
* note that cloned routes from an interface direct route
* still remain.
* NetBSD: 1.5 have no side effects. KAME/netbsd15, and post-1.5R, have
* the same effects as of BSDI.
* OpenBSD: have no side effects. KAME/openbsd has the same effects as
* of BSDI (the change is not merged - yet).
*
* - privileged process
* NetBSD, FreeBSD 3
* struct proc *p;
* if (p && !suser(p->p_ucred, &p->p_acflag))
* privileged;
* FreeBSD 4
* struct proc *p;
* if (p && !suser(p))
* privileged;
* OpenBSD, BSDI [34], FreeBSD 2
* struct socket *so;
* if (so->so_state & SS_PRIV)
* privileged;
* - foo_control
* NetBSD, FreeBSD 3
* needs to give struct proc * as argument
* OpenBSD, BSDI [34], FreeBSD 2
* do not need struct proc *
*
* - bpf:
* OpenBSD, NetBSD 1.5, BSDI [34]
* need caddr_t * (= if_bpf **) and struct ifnet *
* FreeBSD 2, FreeBSD 3, NetBSD post-1.5N
* need only struct ifnet * as argument
*
* - struct ifnet
* use queue.h? member names if name
* --- --- ---
* FreeBSD 2 no old standard if_name+unit
* FreeBSD 3 yes strange if_name+unit
* OpenBSD yes standard if_xname
* NetBSD yes standard if_xname
* BSDI [34] no old standard if_name+unit
*
* - usrreq
* NetBSD, OpenBSD, BSDI [34], FreeBSD 2
* single function with PRU_xx, arguments are mbuf
* FreeBSD 3
* separates functions, non-mbuf arguments
*
* - {set,get}sockopt
* NetBSD, OpenBSD, BSDI [34], FreeBSD 2
* manipulation based on mbuf
* FreeBSD 3
* non-mbuf manipulation using sooptcopy{in,out}()
*
* - timeout() and untimeout()
* NetBSD 1.4.x, OpenBSD, BSDI [34], FreeBSD 2
* timeout() is a void function
* FreeBSD 3
* timeout() is non-void, must keep returned value for untimeout()
* callout_xx is also available (sys/callout.h)
* NetBSD 1.5
* timeout() is obsoleted, use callout_xx (sys/callout.h)
* OpenBSD 2.8
* timeout_{add,set,del} is encouraged (sys/timeout.h)
*
* - sysctl
* NetBSD, OpenBSD
* foo_sysctl()
* BSDI [34]
* foo_sysctl() but with different style. sysctl_int_arr() takes
* care of most of the cases.
* FreeBSD
* linker hack. however, there are freebsd version differences
* (how wonderful!).
* on FreeBSD[23] function arg #define includes paren.
* int foo SYSCTL_HANDLER_ARGS;
* on FreeBSD4, function arg #define does not include paren.
* int foo(SYSCTL_HANDLER_ARGS);
* on some versions, forward reference to the tree is okay.
* on some versions, you need SYSCTL_DECL(). you need things
* like this.
* #ifdef SYSCTL_DECL
* SYSCTL_DECL(net_inet_ip6);
* #endif
* it is hard to share functions between freebsd and non-freebsd.
*
* - if_ioctl
* NetBSD, FreeBSD 3, BSDI [34]
* 2nd argument is u_long cmd
* FreeBSD 2
* 2nd argument is int cmd
*
* - if attach routines
* NetBSD
* void xxattach(int);
* FreeBSD 2, FreeBSD 3
* void xxattach(void *);
* PSEUDO_SET(xxattach, if_xx);
*
* - ovbcopy()
* in NetBSD 1.4 or later, ovbcopy() is not supplied in the kernel.
* bcopy() is safe against overwrites.
*
* - splnet()
* NetBSD 1.4 or later requires splsoftnet().
* other operating systems use splnet().
*
* - struct ifnet for loopback interface
* BSDI3: struct ifnet loif;
* BSDI4: struct ifnet *loifp;
* NetBSD, OpenBSD 2.8, FreeBSD2: struct ifnet loif[NLOOP];
* OpenBSD 2.9: struct ifnet *lo0ifp;
*
* odd thing is that many of them refers loif as ifnet *loif,
* not loif[NLOOP], from outside of if_loop.c.
*
* - number of bpf pseudo devices
* others: bpfilter.h, NBPFILTER
* FreeBSD4: bpf.h, NBPF
* solution:
* #if defined(__FreeBSD__) && __FreeBSD__ >= 4
* #include "bpf.h"
* #define NBPFILTER NBPF
* #else
* #include "bpfilter.h"
* #endif
*
* - protosw for IPv4 (sys/netinet)
* FreeBSD4: struct ipprotosw in netinet/ipprotosw.h
* others: struct protosw in sys/protosw.h
*
* - protosw in general.
* NetBSD 1.5 has extra member for ipfilter (netbsd-current dropped
* it so it will go away in 1.6).
* NetBSD 1.5 requires PR_LISTEN flag bit with protocols that permit
* listen/accept (like tcp).
*
* - header files with defopt (opt_xx.h)
* FreeBSD3: opt_{inet,ipsec,ip6fw,altq}.h
* FreeBSD4: opt_{inet,inet6,ipsec,ip6fw,altq}.h
* NetBSD: opt_{inet,ipsec,altq}.h
* others: does not use defopt
*
* - (m->m_flags & M_EXT) != 0 does *not* mean that the max data length of
* the mbuf == MCLBYTES.
*
* - sys/kern/uipc_mbuf.c:m_dup()
* freebsd[34]: copies the whole mbuf chain.
* netbsd: similar arg with m_copym().
* others: no m_dup().
*
* - ifa_refcnt (struct ifaddr) management (IFAREF/IFAFREE).
* NetBSD 1.5: always use IFAREF whenever reference gets added.
* always use IFAFREE whenever reference gets freed.
* IFAFREE frees ifaddr when ifa_refcnt reaches 0.
* Darwin: always use ifa_addref whenever reference gets added.
* always use ifa_remref whenever reference gets freed.
* ifa_addref and ifa_remref are responsible for determining
* when to free.
* others: do not increase refcnt for ifp->if_addrlist and in_ifaddr.
* use IFAFREE once when ifaddr is disconnected from
* ifp->if_addrlist and in_ifaddr. IFAFREE frees ifaddr when
* ifa_refcnt goes negative.
*/
#ifndef __NET_NET_OSDEP_H_DEFINED_
#define __NET_NET_OSDEP_H_DEFINED_
#include <sys/appleapiopts.h>
#ifdef KERNEL_PRIVATE
struct ifnet;
#define HAVE_OLD_BPF
#define ifa_list ifa_link
#define if_addrlist if_addrhead
#define if_list if_link
#define WITH_CONVERT_AND_STRIP_IP_LEN
#if 1 /* at this moment, all OSes do this */
#define WITH_CONVERT_IP_OFF
#endif
#endif /* KERNEL_PRIVATE */
#endif /*__NET_NET_OSDEP_H_DEFINED_ */