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NetBSD/sys/netipsec/ipsec_osdep.h

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/* $NetBSD: ipsec_osdep.h,v 1.3 2003/10/06 22:05:15 tls Exp $ */
#ifndef NETIPSEC_OSDEP_H
#define NETIPSEC_OSDEP_H
/*
* 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.
*/
/*
* 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.
* Sam Leffler explains, in private email, some problems with
* M_COPY_PKTHDR(), and why FreeBSD deprecated it and replaced it
* with new, explicit macros M_MOVE_PKTHDR()/M_DUP_PKTHDR().
* he original fast-ipsec source uses M_MOVE_PKTHDR.
* NetBSD currently still uses M_COPY_PKTHDR(), so we define
* M_MOVE_PKTHDR in terms of M_COPY_PKTHDR(). Fast-IPsec
* will delete the source mbuf shortly after copying packet tags,
* so we are safe for fast-ipsec but not in general..
*/
#ifdef __NetBSD__
#define M_MOVE_PKTHDR(_f, _t) M_COPY_PKTHDR(_f, _t)
#endif /* __NetBSD__ */
/*
* 5. Fast mbuf-cluster allocation.
* FreeBSD 4.6 introduce m_getcl(), which performs `fast' allocation
* mbuf clusters from a cache of recently-freed clusters. (If the cache
* is empty, new clusters are allocated en-masse).
* On NetBSD, for now, implement the `cache' as an inline function
*using normal NetBSD mbuf/cluster allocation macros. Replace this
* with fast-cache code, if and when NetBSD implements one.
*/
#ifdef __NetBSD__
static __inline struct mbuf *
m_getcl(int how, short type, int flags)
{
struct mbuf *mp;
if (flags & M_PKTHDR)
MGETHDR(mp, how, type);
else
MGET(mp, how, type);
if (mp == NULL)
return NULL;
MCLGET(mp, how);
return mp;
}
#endif /* __NetBSD__ */
/*
* 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(). NetBSD: kludge #define to use time_mono_time.tv_sec.
*/
#ifdef __NetBSD__
#include <sys/kernel.h>
#define time_second mono_time.tv_sec
#endif /* __NetBSD__ */
/* 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_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_ifaddread, 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__
/* For now, use FreeBSD-compatible names for raw interface list. */
#define in_ifaddrhead in_ifaddr
#define ia_link ia_list
#endif /* __NetBSD__ */
/*
* 11. Type of initialization functions.
*/
#ifdef __FreeBSD__
#define INITFN static
#endif
#ifdef __NetBSD__
#define INITFN extern
#endif
/*
* 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 /* NETIPSEC_OSDEP_H */
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