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NetBSD/sys/netipsec/ipsec_osdep.h

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/* $NetBSD: ipsec_osdep.h,v 1.22 2008/01/20 18:09:12 joerg Exp $ */
/* $FreeBSD: /repoman/r/ncvs/src/sys/netipsec/ipsec_osdep.h,v 1.1 2003/09/29 22:47:45 sam Exp $ */
/*
* Copyright (c) 2003 Jonathan Stone (jonathan@cs.stanford.edu)
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
*/
#ifndef _NETIPSEC_OSDEP_H_
#define _NETIPSEC_OSDEP_H_
#ifdef _KERNEL
/*
* Hide porting differences across different 4.4BSD-derived platforms.
*
* 1. KASSERT() differences:
* 2. Kernel Random-number API differences.
* 3. Is packet data in an mbuf object writeable?
* 4. Packet-header semantics.
* 5. Fast mbuf-cluster allocation.
* 6. Network packet-output macros.
* 7. Elased time, in seconds.
* 8. Test if a socket object opened by a privileged (super) user.
* 9. Global SLIST of all open raw sockets.
* 10. Global SLIST of known interface addresses.
* 11. Type of initialization functions.
* 12. Byte order of ip_off
*/
/*
* 1. KASSERT and spl differences
*
* FreeBSD takes an expression and parenthesized printf() argument-list.
* NetBSD takes one arg: the expression being asserted.
* FreeBSD's SPLASSERT() takes an SPL level as 1st arg and a
* parenthesized printf-format argument list as the second argument.
*
* This difference is hidden by two 2-argument macros and one 1-arg macro:
* IPSEC_ASSERT(expr, msg)
* IPSEC_SPLASSERT(spl, msg)
* One further difference is the spl names:
* NetBSD splsoftnet equates to FreeBSD splnet;
* NetBSD splnet equates to FreeBSD splimp.
* which is hidden by the macro IPSEC_SPLASSERT_SOFTNET(msg).
*/
#ifdef __FreeBSD__
#define IPSEC_SPLASSERT(x,y) SPLASSERT(x, y)
#define IPSEC_ASSERT(c,m) KASSERT(c, m)
#define IPSEC_SPLASSERT_SOFTNET(m) SPLASSERT(splnet, m)
#endif /* __FreeBSD__ */
#ifdef __NetBSD__
#define IPSEC_SPLASSERT(x,y) (void)0
#define IPSEC_ASSERT(c,m) KASSERT(c)
#define IPSEC_SPLASSERT_SOFTNET(m) IPSEC_SPLASSERT(softnet, m)
#endif /* __NetBSD__ */
/*
* 2. Kernel Randomness API.
* FreeBSD uses:
* u_int read_random(void *outbuf, int nbytes).
*/
#ifdef __FreeBSD__
#include <sys/random.h>
/* do nothing, use native random code. */
#endif /* __FreeBSD__ */
#ifdef __NetBSD__
#include <sys/rnd.h>
static __inline u_int read_random(void *p, u_int len);
static __inline u_int
read_random(void *bufp, u_int len)
{
return rnd_extract_data(bufp, len, RND_EXTRACT_ANY /*XXX FIXME */);
}
#endif /* __NetBSD__ */
/*
* 3. Test for mbuf mutability
* FreeBSD 4.x uses: M_EXT_WRITABLE
* NetBSD has M_READONLY(). Use !M_READONLY().
* Not an exact match to FreeBSD semantics, but adequate for IPsec purposes.
*
*/
#ifdef __NetBSD__
/* XXX wrong, but close enough for restricted ipsec usage. */
#define M_EXT_WRITABLE(m) (!M_READONLY(m))
#endif /* __NetBSD__ */
/*
* 4. mbuf packet-header/packet-tag semantics.
*/
/*
* nothing.
*/
/*
* 5. Fast mbuf-cluster allocation.
*/
/*
* nothing.
*/
/*
* 6. Network output macros
* FreeBSD uses the IF_HANDOFF(), which raises SPL, enqueues
* a packet, and updates interface counters. NetBSD has IFQ_ENQUE(),
* which leaves SPL changes up to the caller.
* For now, we provide an emulation of IF_HANOOFF() which works
* for protocol input queues.
*/
#ifdef __FreeBSD__
/* nothing to do */
#endif /* __FreeBSD__ */
#ifdef __NetBSD__
#define IF_HANDOFF(ifq, m, f) if_handoff(ifq, m, f, 0)
#include <net/if.h>
static __inline int
if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
{
int need_if_start = 0;
int s = splnet();
if (IF_QFULL(ifq)) {
IF_DROP(ifq);
splx(s);
m_freem(m);
return (0);
}
if (ifp != NULL) {
ifp->if_obytes += m->m_pkthdr.len + adjust;
if (m->m_flags & M_MCAST)
ifp->if_omcasts++;
need_if_start = !(ifp->if_flags & IFF_OACTIVE);
}
IF_ENQUEUE(ifq, m);
if (need_if_start)
(*ifp->if_start)(ifp);
splx(s);
return (1);
}
#endif /* __NetBSD__ */
/*
* 7. Elapsed Time: time_second as time in seconds.
* Original FreeBSD fast-ipsec code references a FreeBSD kernel global,
* time_second().
* XXX is this the right time scale - shouldn't we measure timeout/life times
* using a monotonic time scale (time_uptime, mono_time) - why if the FreeBSD
* base code using UTC based time for this ?
*/
/* protosw glue */
#ifdef __NetBSD__
#include <sys/protosw.h>
#define ipprotosw protosw
#endif /* __NetBSD__ */
/*
* 8. Test for "privileged" socket opened by superuser.
* FreeBSD tests ((so)->so_cred && (so)->so_cred.cr_uid == 0),
* NetBSD (1.6N) tests (so)->so_uid == 0).
* This difference is wrapped inside the IPSEC_PRIVILEGED_SO() macro.
*
*/
#ifdef __FreeBSD__
#define IPSEC_PRIVILEGED_SO(so) ((so)->so_cred && (so)->so_cred.cr_uid == 0)
#endif /* __FreeBSD__ */
#ifdef __NetBSD__
/* superuser opened socket? */
#define IPSEC_PRIVILEGED_SO(so) ((so)->so_uidinfo->ui_uid == 0)
#endif /* __NetBSD__ */
/*
* 9. Raw socket list
* FreeBSD uses: listhead = rawcb_list, SLIST()-next field "list".
* NetBSD uses: listhead = rawcb, SLIST()-next field "list"
*
* This version of fast-ipsec source code uses rawcb_list as the head,
* and (to avoid namespace collisions) uses rcb_list as the "next" field.
*/
#ifdef __FreeBSD__
#define rcb_list list
#endif /* __FreeBSD__ */
#ifdef __NetBSD__
#define rawcb_list rawcb
#endif /* __NetBSD__ */
/*
* 10. List of all known network interfaces.
* FreeBSD has listhead in_ifaddrhead, with ia_link as link.
* NetBSD has listhead in_ifaddr, with ia_list as link.
* No name-clahses, so just #define the appropriate names on NetBSD.
* NB: Is it worth introducing iterator (find-first-list/find-next-list)
* functions or macros to encapsulate these?
*/
#ifdef __FreeBSD__
/* nothing to do for raw interface list */
#endif /* FreeBSD */
#ifdef __NetBSD__
#define ia_link ia_list
#endif /* __NetBSD__ */
/*
* 11. Type of initialization functions.
*/
#ifdef __FreeBSD__
#define INITFN static
#endif
#ifdef __NetBSD__
#define INITFN extern
#endif
/* 12. On FreeBSD, ip_off assumed in host endian;
* it is converted (if necessary) by ip_input().
* On NetBSD, ip_off is in network byte order.
* We hide the difference with the macro IP_OFF_CONVERT
*/
#ifdef __FreeBSD__
#define IP_OFF_CONVERT(x) (x)
#endif
#ifdef __NetBSD__
#define IP_OFF_CONVERT(x) (htons(x))
#endif
/*
* 13. IPv6 support, and "generic" inpcb vs. IPv4 pcb vs. IPv6 pcb.
* To IPv6 V4-mapped addresses (and the KAME-derived implementation
* of IPv6 v4-mapped addresses) we must support limited polymorphism:
* partway down the stack we detect an IPv6 protocol address is really
* a mapped V4 address, and then start dispatching that address to
* native IPv4 PCB lookup. In KAME-derived IPsec (including fas-ipsec)
* some functions must handle arguments which (dynamically) may be either
* a IPv4 pcb (struct inpcb *) or an IPv6 pcb (struct in6pcb *).
*
* In FreeBSD 4.x, sgtrucr in6pcb is syntactic sugar for struct inpcb,
* so punning between struct inpcb* and struct in6pcb* is trivial.
* NetBSD until recently used completely different structs for IPv4
* and IPv6 PCBs. To simplify fast-ipsec coexisting with IPv6,
* NetBSD's struct inpcb and struct in6pcb were changed to both have
* common struct, struct inpcb_hdr, as their first member. NetBSD can
* thus pass arguments as struct inpcb_hdr*, and dispatch on a v4/v6
* flag in the inpcb_hdr at runtime.
*
* We hide the NetBSD-vs-FreeBSD differences inside the following abstraction:
*
* PCB_T: a macro name for a struct type which is used as a "generic"
* argument for actual arguments an in4pcb or an in6pcb.
*
* PCB_FAMILY(p): given a "generic" pcb_t p, returns the protocol
* family (AF_INET, AF_INET6) of the unperlying inpcb/in6pcb.
*
* PCB_SOCKET(p): given a "generic" pcb_t p, returns the associated
* socket pointer
*
* PCB_TO_IN4PCB(p): given generic pcb_t *p, returns a struct inpcb *
* PCB_TO_IN6PCB(p): given generic pcb_t *p, returns a struct in6pcb *
*
* IN4PCB_TO_PCB(inp): given a struct inpcb *inp, returns a pcb_t *
* IN6PCB_TO_PCB(in6p): given a struct in6pcb *in6p, returns a pcb_t *
*/
#ifdef __FreeBSD__
#define PCB_T struct inpcb
#define PCB_FAMILY(p) ((p)->inp_socket->so_proto->pr_domain->dom_family)
#define PCB_SOCKET(p) ((p)->inp_socket)
/* Convert generic pcb to IPv4/IPv6 pcb */
#define PCB_TO_IN4PCB(p) (p)
#define PCB_TO_IN6PCB(p) (p)
/* Convert IPv4/IPv6 pcb to generic pcb, for callers of fast-ipsec */
#define IN4PCB_TO_PCB(p) (p)
#define IN6PCB_TO_PCB(p) (p)
#endif /* __FreeBSD__ */
#ifdef __NetBSD__
#define PCB_T struct inpcb_hdr
#define PCB_FAMILY(p) ((p)->inph_af)
#define PCB_SOCKET(p) ((p)->inph_socket)
#define PCB_TO_IN4PCB(p) ((struct inpcb *)(p))
#define PCB_TO_IN6PCB(p) ((struct in6pcb *)(p))
#define IN4PCB_TO_PCB(p) ((PCB_T *)(&(p)->inp_head))
#define IN6PCB_TO_PCB(p) ((PCB_T *)(&(p)->in6p_head))
#endif /* __NetBSD__ */
/*
* Differences that we don't attempt to hide:
*
* A. Initialization code. This is the largest difference of all.
*
* FreeBSD uses compile/link-time perl hackery to generate special
* .o files with linker sections that give the moral equivalent of
* C++ file-level-object constructors. NetBSD has no such facility.
*
* Either we implement it (ideally, in a way that can emulate
* FreeBSD's SYSINIT() macros), or we must take other means
* to have the per-file init functions called at some appropriate time.
*
* In the absence of SYSINIT(), all the file-level init functions
* now have "extern" linkage. There is a new fast-ipsec init()
* function which calls each of the per-file in an appropriate order.
* init_main will arrange to call the fast-ipsec init function
* after the crypto framework has registered its transforms (including
* any autoconfigured hardware crypto accelerators) but before
* initializing the network stack to send or receive packet.
*
* B. Protosw() differences.
* CSRG-style BSD TCP/IP uses a generic protocol-dispatch-function
* where the specific request is identified by an enum argument.
* FreeBSD replaced that with an array of request-specific
* function pointers.
*
* These differences affect the handlers for key-protocol user requests
* so pervasively that I gave up on the fast-ipsec code, and re-worked the
* NetBSD KAME code to match the (relative few) API differences
* between NetBSD and FreeBSD's KAME netkey, and Fast-IPsec netkey.
*
* C. Timeout() versus callout(9):
* The FreeBSD 4.x netipsec/ code still uses timeout().
* FreeBSD 4.7 has callout(9), so I just replaced
* timeout_*() with the nearest callout_*() equivalents,
* and added a callout handle to the ipsec context.
*
* D. SPL name differences.
* FreeBSD splnet() equates directly to NetBSD's splsoftnet();
* FreeBSD uses splimp() where (for networking) NetBSD would use splnet().
*/
#endif /* _KERNEL */
#endif /* !_NETIPSEC_OSDEP_H_ */
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