sys/net/net_osdep.h

   1 /*
   2  * $KAME: net_osdep.h,v 1.68 2001/12/21 08:14:58 itojun Exp $
   3  * $FreeBSD: src/sys/net/net_osdep.h,v 1.1.2.3 2002/04/28 05:40:25 suz Exp $
   4  * $DragonFly: src/sys/net/net_osdep.h,v 1.8 2008/03/07 11:34:19 sephe Exp $
   5  */
   6 /*
   7  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   8  * All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the project nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34 /*
  35  * glue for kernel code programming differences.
  36  */
  37
  38 /*
  39  * OS dependencies:
  40  * - ioctl
  41  *   FreeBSD 3 and later warn when sys/ioctl.h is included in a kernel source
  42  *   file.  For socket ioctl, we are suggested to use sys/sockio.h.
  43  *
  44  * - RTFREE()
  45  *   bsdi does not escape this macro using do-clause, so it is recommended
  46  *   to escape the macro explicitly.
  47  *   e.g.
  48  *      if (rt) {
  49  *              RTFREE(rt);
  50  *      }
  51  *
  52  * - whether the IPv4 input routine convert the byte order of some fileds
  53  *   of the IP header (x: convert to the host byte order, s: strip the header
  54  *   length for possible reassembly)
  55  *             ip_len ip_id ip_off
  56  * bsdi3:          xs     x      x
  57  * bsdi4:          xs            x
  58  * freebsd[23]:    xs     x      x
  59  * freebsd4:       xs            x
  60  * NetBSD:          x            x
  61  * OpenBSD:        xs     x      x
  62  *
  63  * - ifa_ifwithaf()
  64  *   bsdi[34], netbsd, and openbsd define it in sys/net/if.c
  65  *   freebsd (all versions) does not have it.
  66  *
  67  * - struct rt_addrinfo
  68  *   bsdi4, netbsd 1.5R and beyond: rti_addrs, rti_info[], rti_flags, rti_ifa,
  69  *      rti_ifp, and rti_rtm.
  70  *   others: rti_addrs and rti_info[] only.
  71  *
  72  * - ifa->ifa_rtrequest
  73  *   bsdi4, netbsd 1.5R and beyond: rt_addrinfo *
  74  *   others: sockaddr * (note that sys/net/route.c:rtrequest() has an unsafe
  75  *      typecast code, from 4.3BSD-reno)
  76  *
  77  * - side effects of rtrequest{,1}(RTM_DELETE)
  78  *      BSDI[34]: delete all cloned routes underneath the route.
  79  *      FreeBSD[234]: delete all protocol-cloned routes underneath the route.
  80  *                    note that cloned routes from an interface direct route
  81  *                    still remain.
  82  *      NetBSD: 1.5 have no side effects.  KAME/netbsd15, and post-1.5R, have
  83  *              the same effects as of BSDI.
  84  *      OpenBSD: have no side effects.  KAME/openbsd has the same effects as
  85  *              of BSDI (the change is not merged - yet).
  86  *
  87  * - privileged process
  88  *      NetBSD, FreeBSD 3
  89  *              struct proc *p;
  90  *              if (p && !suser(p->p_ucred, &p->p_acflag))
  91  *                      privileged;
  92  *      FreeBSD 4
  93  *              struct proc *p;
  94  *              if (p && !suser(p))
  95  *                      privileged;
  96  *      OpenBSD, BSDI [34], FreeBSD 2
  97  *              struct socket *so;
  98  *              if (so->so_state & SS_PRIV)
  99  *                      privileged;
 100  * - foo_control
 101  *      NetBSD, FreeBSD 3
 102  *              needs to give struct proc * as argument
 103  *      OpenBSD, BSDI [34], FreeBSD 2
 104  *              do not need struct proc *
 105  *
 106  * - bpf:
 107  *      OpenBSD, NetBSD 1.5, BSDI [34]
 108  *              need caddr_t * (= if_bpf **) and struct ifnet *
 109  *      FreeBSD 2, FreeBSD 3, NetBSD post-1.5N
 110  *              need only struct ifnet * as argument
 111  *
 112  * - struct ifnet
 113  *                      use queue.h?    member names    if name
 114  *                      ---             ---             ---
 115  *      FreeBSD 2       no              old standard    if_name+unit
 116  *      FreeBSD 3       yes             strange         if_name+unit
 117  *      OpenBSD         yes             standard        if_xname
 118  *      NetBSD          yes             standard        if_xname
 119  *      BSDI [34]       no              old standard    if_name+unit
 120  *
 121  * - usrreq
 122  *      NetBSD, OpenBSD, BSDI [34], FreeBSD 2
 123  *              single function with PRU_xx, arguments are mbuf
 124  *      FreeBSD 3
 125  *              separates functions, non-mbuf arguments
 126  *
 127  * - {set,get}sockopt
 128  *      NetBSD, OpenBSD, BSDI [34], FreeBSD 2
 129  *              manipulation based on mbuf
 130  *      FreeBSD 3
 131  *              non-mbuf manipulation using sooptcopy{in,out}()
 132  *
 133  * - timeout() and untimeout()
 134  *      NetBSD 1.4.x, OpenBSD, BSDI [34], FreeBSD 2
 135  *              timeout() is a void function
 136  *      FreeBSD 3
 137  *              timeout() is non-void, must keep returned value for untimeout()
 138  *              callout_xx is also available (sys/callout.h)
 139  *      NetBSD 1.5
 140  *              timeout() is obsoleted, use callout_xx (sys/callout.h)
 141  *      OpenBSD 2.8
 142  *              timeout_{add,set,del} is encouraged (sys/timeout.h)
 143  *
 144  * - kernel internal time structure
 145  *      FreeBSD 2, NetBSD, OpenBSD, BSD/OS
 146  *              mono_time.tv_u?sec, time.tv_u?sec
 147  *      FreeBSD [34]
 148  *              time_second
 149  *      if you need portability, #ifdef out FreeBSD[34], or use microtime(&tv)
 150  *      then touch tv.tv_sec (note: microtime is an expensive operation).
 151  *
 152  * - sysctl
 153  *      NetBSD, OpenBSD
 154  *              foo_sysctl()
 155  *      BSDI [34]
 156  *              foo_sysctl() but with different style.  sysctl_int_arr() takes
 157  *              care of most of the cases.
 158  *      FreeBSD
 159  *              linker hack.  however, there are freebsd version differences
 160  *              (how wonderful!).
 161  *              on FreeBSD[23] function arg #define includes paren.
 162  *                      int foo SYSCTL_HANDLER_ARGS;
 163  *              on FreeBSD4, function arg #define does not include paren.
 164  *                      int foo(SYSCTL_HANDLER_ARGS);
 165  *              on some versions, forward reference to the tree is okay.
 166  *              on some versions, you need SYSCTL_DECL().  you need things
 167  *              like this.
 168  *                      #ifdef SYSCTL_DECL
 169  *                      SYSCTL_DECL(net_inet_ip6);
 170  *                      #endif
 171  *              it is hard to share functions between freebsd and non-freebsd.
 172  *
 173  * - if_ioctl
 174  *      NetBSD, FreeBSD 3, BSDI [34]
 175  *              2nd argument is u_long cmd
 176  *      FreeBSD 2
 177  *              2nd argument is int cmd
 178  *
 179  * - if attach routines
 180  *      NetBSD
 181  *              void xxattach(int);
 182  *      FreeBSD 2, FreeBSD 3
 183  *              void xxattach(void *);
 184  *              PSEUDO_SET(xxattach, if_xx);
 185  *
 186  * - protosw for IPv4 (sys/netinet)
 187  *      FreeBSD4: struct ipprotosw in netinet/ipprotosw.h
 188  *      others: struct protosw in sys/protosw.h
 189  *
 190  * - protosw in general.
 191  *      NetBSD 1.5 has extra member for ipfilter (netbsd-current dropped
 192  *      it so it will go away in 1.6).
 193  *      NetBSD 1.5 requires PR_LISTEN flag bit with protocols that permit
 194  *      listen/accept (like tcp).
 195  *
 196  * - header files with defopt (opt_xx.h)
 197  *      FreeBSD3: opt_{inet,ipsec,ip6fw,altq}.h
 198  *      FreeBSD4: opt_{inet,inet6,ipsec,ip6fw,altq}.h
 199  *      NetBSD: opt_{inet,ipsec,altq}.h
 200  *      others: does not use defopt
 201  *
 202  * - (m->m_flags & M_EXT) != 0 does *not* mean that the max data length of
 203  *   the mbuf == MCLBYTES.
 204  *
 205  * - sys/kern/uipc_mbuf.c:m_dup()
 206  *      freebsd[34]: copies the whole mbuf chain.
 207  *      netbsd: similar arg with m_copym().
 208  *      others: no m_dup().
 209  *
 210  * - ifa_refcnt (struct ifaddr) management (IFAREF/IFAFREE).
 211  *      NetBSD 1.5: always use IFAREF whenever reference gets added.
 212  *              always use IFAFREE whenever reference gets freed.
 213  *              IFAFREE frees ifaddr when ifa_refcnt reaches 0.
 214  *      others: do not increase refcnt for ifp->if_addrlist and in_ifaddr.
 215  *              use IFAFREE once when ifaddr is disconnected from
 216  *              ifp->if_addrlist and in_ifaddr.  IFAFREE frees ifaddr when
 217  *              ifa_refcnt goes negative.  in KAME environment, IFAREF is
 218  *              provided as a compatibility wrapper (use it instead of
 219  *              ifa_refcnt++ to reduce #ifdef).
 220  *
 221  * - ifnet.if_lastchange
 222  *      freebsd, bsdi, netbsd-current (jun 14 2001-),
 223  *      openbsd-current (jun 15 2001-): updated only when IFF_UP changes.
 224  *              (RFC1573 ifLastChange interpretation)
 225  *      netbsd151, openbsd29: updated whenever packets go through the interface.
 226  *              (4.4BSD interpretation)
 227  *
 228  * - kernel compilation options ("options HOGE" in kernel config file)
 229  *      freebsd4: sys/conf/options has to have mapping between option
 230  *              and a header file (opt_hoge.h).
 231  *      netbsd: by default, -DHOGE will go into
 232  *              sys/arch/foo/compile/BAR/Makefile.
 233  *              if you define mapping in sys/conf/files, you can create
 234  *              a header file like opt_hoge.h to help make dependencies.
 235  *      bsdi/openbsd: always use -DHOGE in Makefile.  there's no need/way
 236  *              to have opt_hoge.h.
 237  *
 238  *      therefore, opt_hoge.h is mandatory on freebsd4 only.
 239  *
 240  * - MALLOC() macro
 241  *      Use it only if the size of the allocation is constant.
 242  *      When we do NOT collect statistics about kernel memory usage, the result
 243  *      of macro expansion contains a large set of condition branches.  If the
 244  *      size is not constant, compilation optimization cannot be applied, and
 245  *      a bunch of the large branch will be embedded in the kernel code.
 246  *
 247  * - M_COPY_PKTHDR
 248  *      openbsd30: M_COPY_PKTHDR is deprecated.  use M_MOVE_PKTHDR or
 249  *              M_DUP_PKTHDR, depending on how you want to handle m_tag.
 250  *      others: M_COPY_PKTHDR is available as usual.
 251  */
 252
 253 #ifndef _NET_NET_OSDEP_H_
 254 #define _NET_NET_OSDEP_H_
 255 #ifdef _KERNEL
 256
 257 struct ifnet;
 258 extern const char *if_name (struct ifnet *);
 259
 260 #define HAVE_OLD_BPF
 261
 262 #define if_list         if_link
 263
 264 #define WITH_CONVERT_AND_STRIP_IP_LEN
 265
 266 #if 1                           /* at this moment, all OSes do this */
 267 #define WITH_CONVERT_IP_OFF
 268 #endif
 269
 270 #endif /*_KERNEL*/
 271 #endif /*_NET_NET_OSDEP_H_*/