The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/net_osdep.h

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    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  * - ovbcopy()
  187  *      in NetBSD 1.4 or later, ovbcopy() is not supplied in the kernel.
  188  *      we have updated sys/systm.h to include declaration.
  189  *
  190  * - splnet()
  191  *      NetBSD 1.4 or later requires splsoftnet().
  192  *      other operating systems use splnet().
  193  *
  194  * - splimp()
  195  *      NetBSD-current (2001/4/13): use splnet() in network, splvm() in vm.
  196  *      other operating systems: use splimp().
  197  *
  198  * - struct ifnet for loopback interface
  199  *      BSDI3: struct ifnet loif;
  200  *      BSDI4: struct ifnet *loifp;
  201  *      NetBSD, OpenBSD 2.8, FreeBSD2: struct ifnet loif[NLOOP];
  202  *      OpenBSD 2.9: struct ifnet *lo0ifp;
  203  *
  204  *      odd thing is that many of them refers loif as ifnet *loif,
  205  *      not loif[NLOOP], from outside of if_loop.c.
  206  *
  207  * - number of bpf pseudo devices
  208  *      others: bpfilter.h, NBPFILTER
  209  *      FreeBSD4: use_bpf.h, NBPF
  210  *      solution:
  211  *              #if defined(__FreeBSD__) && __FreeBSD__ >= 4
  212  *              #include "use_bpf.h"
  213  *              #define NBPFILTER       NBPF
  214  *              #else
  215  *              #include "bpfilter.h"
  216  *              #endif
  217  *
  218  * - protosw for IPv4 (sys/netinet)
  219  *      FreeBSD4: struct ipprotosw in netinet/ipprotosw.h
  220  *      others: struct protosw in sys/protosw.h
  221  *
  222  * - protosw in general.
  223  *      NetBSD 1.5 has extra member for ipfilter (netbsd-current dropped
  224  *      it so it will go away in 1.6).
  225  *      NetBSD 1.5 requires PR_LISTEN flag bit with protocols that permit
  226  *      listen/accept (like tcp).
  227  *
  228  * - header files with defopt (opt_xx.h)
  229  *      FreeBSD3: opt_{inet,ipsec,ip6fw,altq}.h
  230  *      FreeBSD4: opt_{inet,inet6,ipsec,ip6fw,altq}.h
  231  *      NetBSD: opt_{inet,ipsec,altq}.h
  232  *      others: does not use defopt
  233  *
  234  * - (m->m_flags & M_EXT) != 0 does *not* mean that the max data length of
  235  *   the mbuf == MCLBYTES.
  236  *
  237  * - sys/kern/uipc_mbuf.c:m_dup()
  238  *      freebsd[34]: copies the whole mbuf chain.
  239  *      netbsd: similar arg with m_copym().
  240  *      others: no m_dup().
  241  *
  242  * - ifa_refcnt (struct ifaddr) management (IFAREF/IFAFREE).
  243  *      NetBSD 1.5: always use IFAREF whenever reference gets added.
  244  *              always use IFAFREE whenever reference gets freed.
  245  *              IFAFREE frees ifaddr when ifa_refcnt reaches 0.
  246  *      others: do not increase refcnt for ifp->if_addrlist and in_ifaddr.
  247  *              use IFAFREE once when ifaddr is disconnected from
  248  *              ifp->if_addrlist and in_ifaddr.  IFAFREE frees ifaddr when
  249  *              ifa_refcnt goes negative.  in KAME environment, IFAREF is
  250  *              provided as a compatibility wrapper (use it instead of
  251  *              ifa_refcnt++ to reduce #ifdef).
  252  *
  253  * - ifnet.if_lastchange
  254  *      freebsd, bsdi, netbsd-current (jun 14 2001-),
  255  *      openbsd-current (jun 15 2001-): updated only when IFF_UP changes.
  256  *              (RFC1573 ifLastChange interpretation)
  257  *      netbsd151, openbsd29: updated whenever packets go through the interface.
  258  *              (4.4BSD interpretation)
  259  *
  260  * - kernel compilation options ("options HOGE" in kernel config file)
  261  *      freebsd4: sys/conf/options has to have mapping between option
  262  *              and a header file (opt_hoge.h).
  263  *      netbsd: by default, -DHOGE will go into
  264  *              sys/arch/foo/compile/BAR/Makefile.
  265  *              if you define mapping in sys/conf/files, you can create
  266  *              a header file like opt_hoge.h to help make dependencies.
  267  *      bsdi/openbsd: always use -DHOGE in Makefile.  there's no need/way
  268  *              to have opt_hoge.h.
  269  *
  270  *      therefore, opt_hoge.h is mandatory on freebsd4 only.
  271  *
  272  * - MALLOC() macro
  273  *      Use it only if the size of the allocation is constant.
  274  *      When we do NOT collect statistics about kernel memory usage, the result
  275  *      of macro expansion contains a large set of condition branches.  If the
  276  *      size is not constant, compilation optimization cannot be applied, and
  277  *      a bunch of the large branch will be embedded in the kernel code.
  278  *
  279  * - M_COPY_PKTHDR
  280  *      openbsd30: M_COPY_PKTHDR is deprecated.  use M_MOVE_PKTHDR or
  281  *              M_DUP_PKTHDR, depending on how you want to handle m_tag.
  282  *      others: M_COPY_PKTHDR is available as usual.
  283  */
  284 
  285 #ifndef _NET_NET_OSDEP_H_
  286 #define _NET_NET_OSDEP_H_
  287 #ifdef _KERNEL
  288 
  289 struct ifnet;
  290 extern const char *if_name (struct ifnet *);
  291 
  292 #define HAVE_OLD_BPF
  293 
  294 #define if_list         if_link
  295 
  296 #define WITH_CONVERT_AND_STRIP_IP_LEN
  297 
  298 #if 1                           /* at this moment, all OSes do this */
  299 #define WITH_CONVERT_IP_OFF
  300 #endif
  301 
  302 #endif /*_KERNEL*/
  303 #endif /*_NET_NET_OSDEP_H_*/

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