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 /*      $FreeBSD: releng/6.0/sys/net/net_osdep.h 140043 2005-01-11 07:08:15Z ume $      */
    2 /*      $KAME: net_osdep.h,v 1.80 2003/08/09 17:06:39 suz Exp $ */
    3 
    4 /*-
    5  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. Neither the name of the project nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 /*
   33  * glue for kernel code programming differences.
   34  */
   35 
   36 /*
   37  * OS dependencies:
   38  * - ioctl
   39  *   FreeBSD 3 and later warn when sys/ioctl.h is included in a kernel source
   40  *   file.  For socket ioctl, we are suggested to use sys/sockio.h.
   41  *
   42  * - RTFREE()
   43  *   bsdi does not escape this macro using do-clause, so it is recommended
   44  *   to escape the macro explicitly.
   45  *   e.g.
   46  *      if (rt) {
   47  *              RTFREE(rt);
   48  *      }
   49  *
   50  * - whether the IPv4 input routine convert the byte order of some fileds
   51  *   of the IP header (x: convert to the host byte order, s: strip the header
   52  *   length for possible reassembly)
   53  *             ip_len ip_id ip_off
   54  * bsdi3:          xs     x      x
   55  * bsdi4:          xs            x
   56  * freebsd[23]:    xs     x      x 
   57  * freebsd4:       xs            x
   58  * NetBSD:          x            x
   59  * OpenBSD:        xs     x      x
   60  *
   61  * - ifa_ifwithaf()
   62  *   bsdi[34], netbsd, and openbsd define it in sys/net/if.c
   63  *   freebsd (all versions) does not have it.
   64  *  
   65  * - struct rt_addrinfo
   66  *   bsdi4, netbsd 1.5R and beyond: rti_addrs, rti_info[], rti_flags, rti_ifa,
   67  *      rti_ifp, and rti_rtm.
   68  *   others: rti_addrs and rti_info[] only.
   69  *
   70  * - ifa->ifa_rtrequest
   71  *   bsdi4, netbsd 1.5R and beyond: rt_addrinfo *
   72  *   others: sockaddr * (note that sys/net/route.c:rtrequest() has an unsafe
   73  *      typecast code, from 4.3BSD-reno)
   74  *
   75  * - side effects of rtrequest{,1}(RTM_DELETE)
   76  *      BSDI[34]: delete all cloned routes underneath the route.
   77  *      FreeBSD[234]: delete all protocol-cloned routes underneath the route.
   78  *                    note that cloned routes from an interface direct route
   79  *                    still remain.
   80  *      NetBSD: 1.5 have no side effects.  KAME/netbsd15, and post-1.5R, have
   81  *              the same effects as of BSDI.
   82  *      OpenBSD: have no side effects.  KAME/openbsd has the same effects as
   83  *              of BSDI (the change is not merged - yet).
   84  *
   85  * - privileged process
   86  *      NetBSD, FreeBSD 3
   87  *              struct proc *p;
   88  *              if (p && !suser(p->p_ucred, &p->p_acflag))
   89  *                      privileged;
   90  *      FreeBSD 4
   91  *              struct proc *p;
   92  *              if (p && !suser(p))
   93  *                      privileged;
   94  *      FreeBSD 5
   95  *              struct thread *td;
   96  *              if (suser(td))
   97  *                      privileged;
   98  *      OpenBSD, BSDI [34], FreeBSD 2
   99  *              struct socket *so;
  100  *              if (so->so_state & SS_PRIV)
  101  *                      privileged;
  102  * - foo_control
  103  *      NetBSD, FreeBSD 3
  104  *              needs to give struct proc * as argument
  105  *      OpenBSD, BSDI [34], FreeBSD 2
  106  *              do not need struct proc *
  107  *
  108  * - bpf:
  109  *      OpenBSD, NetBSD 1.5, BSDI [34]
  110  *              need caddr_t * (= if_bpf **) and struct ifnet *
  111  *      FreeBSD 2, FreeBSD 3, NetBSD post-1.5N
  112  *              need only struct ifnet * as argument
  113  *
  114  * - bpfattach:
  115  *      OpenBSD, NetBSD 1.5, BSDI [34]
  116  *              bpfattach(caddr_t *, struct ifnet *, u_int, u_int)
  117  *      FreeBSD, NetBSD 1.6:
  118  *              bpfattach(struct ifnet *, u_int, u_int)
  119  *
  120  * - bpf_mtap:
  121  *      OpenBSD, NetBSD, BSDI [34]
  122  *              bpf_mtap(caddr_t, struct mbuf *)
  123  *      FreeBSD
  124  *              bpf_mtap(struct ifnet *, struct mbuf *)
  125  *
  126  * - struct ifnet
  127  *                      use queue.h?    member names    if name
  128  *                      ---             ---             ---
  129  *      FreeBSD 2       no              old standard    if_name+unit
  130  *      FreeBSD 3       yes             strange         if_name+unit
  131  *      FreeBSD 4       yes             strange         if_name+unit
  132  *      FreeBSD 5       yes             standard        if_xname
  133  *      OpenBSD         yes             standard        if_xname
  134  *      NetBSD          yes             standard        if_xname
  135  *      BSDI [34]       no              old standard    if_name+unit
  136  *
  137  * - usrreq
  138  *      NetBSD, OpenBSD, BSDI [34], FreeBSD 2
  139  *              single function with PRU_xx, arguments are mbuf
  140  *      FreeBSD 3
  141  *              separates functions, non-mbuf arguments
  142  *
  143  * - {set,get}sockopt
  144  *      NetBSD, OpenBSD, BSDI [34], FreeBSD 2
  145  *              manipulation based on mbuf
  146  *      FreeBSD 3
  147  *              non-mbuf manipulation using sooptcopy{in,out}()
  148  *
  149  * - timeout() and untimeout()
  150  *      NetBSD 1.4.x, OpenBSD, BSDI [34], FreeBSD 2
  151  *              timeout() is a void function
  152  *      FreeBSD 3
  153  *              timeout() is non-void, must keep returned value for untimeout()
  154  *              callout_xx is also available (sys/callout.h)
  155  *      NetBSD 1.5
  156  *              timeout() is obsoleted, use callout_xx (sys/callout.h)
  157  *      OpenBSD 2.8
  158  *              timeout_{add,set,del} is encouraged (sys/timeout.h)
  159  *
  160  * - kernel internal time structure
  161  *      FreeBSD 2, NetBSD, OpenBSD, BSD/OS
  162  *              mono_time.tv_u?sec, time.tv_u?sec
  163  *      FreeBSD [34]
  164  *              time_second
  165  *      if you need portability, #ifdef out FreeBSD[34], or use microtime(&tv)
  166  *      then touch tv.tv_sec (note: microtime is an expensive operation, so
  167  *      the use of mono_time is preferred).
  168  *
  169  * - sysctl
  170  *      NetBSD, OpenBSD
  171  *              foo_sysctl()
  172  *      BSDI [34]
  173  *              foo_sysctl() but with different style.  sysctl_int_arr() takes
  174  *              care of most of the cases.
  175  *      FreeBSD
  176  *              linker hack.  however, there are freebsd version differences
  177  *              (how wonderful!).
  178  *              on FreeBSD[23] function arg #define includes paren.
  179  *                      int foo SYSCTL_HANDLER_ARGS;
  180  *              on FreeBSD4, function arg #define does not include paren.
  181  *                      int foo(SYSCTL_HANDLER_ARGS);
  182  *              on some versions, forward reference to the tree is okay.
  183  *              on some versions, you need SYSCTL_DECL().  you need things
  184  *              like this.
  185  *                      #ifdef SYSCTL_DECL
  186  *                      SYSCTL_DECL(net_inet_ip6);
  187  *                      #endif
  188  *              it is hard to share functions between freebsd and non-freebsd.
  189  *
  190  * - if_ioctl
  191  *      NetBSD, FreeBSD 3, BSDI [34]
  192  *              2nd argument is u_long cmd
  193  *      FreeBSD 2
  194  *              2nd argument is int cmd
  195  *
  196  * - if attach routines
  197  *      NetBSD
  198  *              void xxattach(int);
  199  *      FreeBSD 2, FreeBSD 3
  200  *              void xxattach(void *);
  201  *              PSEUDO_SET(xxattach, if_xx);
  202  *
  203  * - ovbcopy()
  204  *      in NetBSD 1.4 or later, ovbcopy() is not supplied in the kernel.
  205  *      we have updated sys/systm.h to include declaration.
  206  *
  207  * - splnet()
  208  *      NetBSD 1.4 or later, and OpenBSD, requires splsoftnet().
  209  *      other operating systems use splnet().
  210  *
  211  * - splimp()
  212  *      NetBSD 1.6: use splnet() in network, splvm() in vm.
  213  *      other operating systems: use splimp().
  214  *
  215  * - dtom()
  216  *      NEVER USE IT!
  217  *
  218  * - struct ifnet for loopback interface
  219  *      BSDI3: struct ifnet loif;
  220  *      BSDI4: struct ifnet *loifp;
  221  *      NetBSD, OpenBSD 2.8, FreeBSD2: struct ifnet loif[NLOOP];
  222  *      OpenBSD 2.9: struct ifnet *lo0ifp;
  223  *
  224  *      odd thing is that many of them refers loif as ifnet *loif,
  225  *      not loif[NLOOP], from outside of if_loop.c.
  226  *
  227  * - number of bpf pseudo devices
  228  *      others: bpfilter.h, NBPFILTER
  229  *      FreeBSD4: bpf.h, NBPF
  230  *      solution:
  231  *              #if defined(__FreeBSD__) && __FreeBSD__ >= 4
  232  *              #include "bpf.h"
  233  *              #define NBPFILTER       NBPF
  234  *              #else
  235  *              #include "bpfilter.h"
  236  *              #endif
  237  *
  238  * - protosw for IPv4 (sys/netinet)
  239  *      FreeBSD4: struct ipprotosw in netinet/ipprotosw.h
  240  *      others: struct protosw in sys/protosw.h
  241  *
  242  * - protosw in general.
  243  *      NetBSD 1.5 has extra member for ipfilter (netbsd-current dropped
  244  *      it so it went away in 1.6).
  245  *      NetBSD 1.5 requires PR_LISTEN flag bit with protocols that permit
  246  *      listen/accept (like tcp).
  247  *
  248  * - header files with defopt (opt_xx.h)
  249  *      FreeBSD3: opt_{inet,ipsec,ip6fw,altq}.h
  250  *      FreeBSD4: opt_{inet,inet6,ipsec,ip6fw,altq}.h
  251  *      NetBSD: opt_{inet,ipsec,altq}.h
  252  *      others: does not use defopt
  253  *
  254  * - IN_MULTICAST/IN_CLASS[A-D] macro.
  255  *      OpenBSD and NetBSD: net endian (kernel) or host endian (userland)
  256  *      others: always host endian
  257  *
  258  * - (m->m_flags & M_EXT) != 0 does *not* mean that the max data length of
  259  *   the mbuf == MCLBYTES.
  260  *
  261  * - sys/kern/uipc_mbuf.c:m_dup()
  262  *      freebsd[34]: copies the whole mbuf chain.
  263  *      netbsd: similar arg with m_copym().
  264  *      others: no m_dup().
  265  *
  266  * - ifa_refcnt (struct ifaddr) management (IFAREF/IFAFREE).
  267  *      NetBSD 1.5: always use IFAREF whenever reference gets added.
  268  *              always use IFAFREE whenever reference gets freed.
  269  *              IFAFREE frees ifaddr when ifa_refcnt reaches 0.
  270  *      others: do not increase refcnt for ifp->if_addrlist and in_ifaddr.
  271  *              use IFAFREE once when ifaddr is disconnected from
  272  *              ifp->if_addrlist and in_ifaddr.  IFAFREE frees ifaddr when
  273  *              ifa_refcnt goes negative.  in KAME environment, IFAREF is
  274  *              provided as a compatibility wrapper (use it instead of
  275  *              ifa_refcnt++ to reduce #ifdef).
  276  *
  277  * - ifnet.if_lastchange
  278  *      freebsd, bsdi, netbsd-current (jun 14 2001-),
  279  *      openbsd-current (jun 15 2001-): updated only when IFF_UP changes.
  280  *              (RFC1573 ifLastChange interpretation)
  281  *      netbsd151, openbsd29: updated whenever packets go through the interface.
  282  *              (4.4BSD interpretation)
  283  *
  284  * - kernel compilation options ("options HOGE" in kernel config file)
  285  *      freebsd4: sys/conf/options has to have mapping between option
  286  *              and a header file (opt_hoge.h).
  287  *      netbsd: by default, -DHOGE will go into
  288  *              sys/arch/foo/compile/BAR/Makefile.
  289  *              if you define mapping in sys/conf/files, you can create
  290  *              a header file like opt_hoge.h to help make dependencies.
  291  *      bsdi/openbsd: always use -DHOGE in Makefile.  there's no need/way
  292  *              to have opt_hoge.h.
  293  *
  294  *      therefore, opt_hoge.h is mandatory on freebsd4 only.
  295  *
  296  * - MALLOC() macro
  297  *      Use it only if the size of the allocation is constant.
  298  *      When we do NOT collect statistics about kernel memory usage, the result
  299  *      of macro expansion contains a large set of condition branches.  If the
  300  *      size is not constant, compilation optimization cannot be applied, and
  301  *      a bunch of the large branch will be embedded in the kernel code.
  302  *
  303  * - M_COPY_PKTHDR
  304  *      openbsd30, freebsd4(after 4.8): M_COPY_PKTHDR is deprecated.
  305  *              use M_MOVE_PKTHDR or M_DUP_PKTHDR, depending on how you want
  306  *              to handle m_tag.
  307  *      others: M_COPY_PKTHDR is available as usual.
  308  *
  309  * - M_READONLY() macro
  310  *      OpenBSD 3.0 and NetBSD 1.6 has it.
  311  *      FreeBSD 4.x uses M_WRITABLE() macro, which is opposite (NIH!).
  312  *      KAME tree has it for all platforms except FreeBSD 4.x.
  313  *
  314  * - TAILQ_EMPTY
  315  *      BSD/OS 4.x does not have this macro.
  316  */
  317 
  318 #ifndef __NET_NET_OSDEP_H_DEFINED_
  319 #define __NET_NET_OSDEP_H_DEFINED_
  320 #ifdef _KERNEL
  321 
  322 #define if_name(ifp)    ((ifp)->if_xname)
  323 
  324 #define HAVE_NEW_BPFATTACH
  325 
  326 #define ifa_list        ifa_link
  327 #define if_addrlist     if_addrhead
  328 #define if_list         if_link
  329 
  330 #define HAVE_PPSRATECHECK
  331 
  332 /* sys/net/if.h */
  333 #define WITH_CONVERT_AND_STRIP_IP_LEN
  334 #define WITH_CONVERT_IP_OFF
  335 
  336 #endif /*_KERNEL*/
  337 #endif /*__NET_NET_OSDEP_H_DEFINED_ */

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