349 lines
11 KiB
C
349 lines
11 KiB
C
/* $NetBSD: ipsec_osdep.h,v 1.6 2004/01/20 22:55:14 jonathan Exp $ */
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#ifndef NETIPSEC_OSDEP_H
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#define NETIPSEC_OSDEP_H
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/*
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* Hide porting differences across different 4.4BSD-derived platforms.
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*
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* 1. KASSERT() differences:
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* 2. Kernel Random-number API differences.
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* 3. Is packet data in an mbuf object writeable?
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* 4. Packet-header semantics.
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* 5. Fast mbuf-cluster allocation.
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* 6. Network packet-output macros.
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* 7. Elased time, in seconds.
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* 8. Test if a socket object opened by a privileged (super) user.
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* 9. Global SLIST of all open raw sockets.
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* 10. Global SLIST of known interface addresses.
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* 11. Type of initialization functions.
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*/
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/*
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* 1. KASSERT and spl differences
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*
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* FreeBSD takes an expression and parenthesized printf() argument-list.
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* NetBSD takes one arg: the expression being asserted.
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* FreeBSD's SPLASSERT() takes an SPL level as 1st arg and a
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* parenthesized printf-format argument list as the second argument.
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*
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* This difference is hidden by two 2-argument macros and one 1-arg macro:
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* IPSEC_ASSERT(expr, msg)
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* IPSEC_SPLASSERT(spl, msg)
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* One further difference is the spl names:
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* NetBSD splsoftnet equates to FreeBSD splnet;
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* NetBSD splnet equates to FreeBSD splimp.
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* which is hidden by the macro IPSEC_SPLASSERT_SOFTNET(msg).
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*/
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#ifdef __FreeBSD__
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#define IPSEC_SPLASSERT(x,y) SPLASSERT(x, y)
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#define IPSEC_ASSERT(c,m) KASSERT(c, m)
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#define IPSEC_SPLASSERT_SOFTNET(m) SPLASSERT(splnet, m)
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#endif /* __FreeBSD__ */
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#ifdef __NetBSD__
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#define IPSEC_SPLASSERT(x,y) (void)0
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#define IPSEC_ASSERT(c,m) KASSERT(c)
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#define IPSEC_SPLASSERT_SOFTNET(m) IPSEC_SPLASSERT(softnet, m)
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#endif /* __NetBSD__ */
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/*
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* 2. Kernel Randomness API.
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* FreeBSD uses:
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* u_int read_random(void *outbuf, int nbytes).
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*/
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#ifdef __FreeBSD__
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#include <sys/random.h>
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/* do nothing, use native random code. */
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#endif /* __FreeBSD__ */
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#ifdef __NetBSD__
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#include <sys/rnd.h>
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static __inline u_int read_random(void *p, u_int len);
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static __inline u_int
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read_random(void *bufp, u_int len)
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{
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return rnd_extract_data(bufp, len, RND_EXTRACT_ANY /*XXX FIXME */);
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}
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#endif /* __NetBSD__ */
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/*
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* 3. Test for mbuf mutability
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* FreeBSD 4.x uses: M_EXT_WRITABLE
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* NetBSD has M_READONLY(). Use !M_READONLY().
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* Not an exact match to FreeBSD semantics, but adequate for IPsec purposes.
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*
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*/
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#ifdef __NetBSD__
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/* XXX wrong, but close enough for restricted ipsec usage. */
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#define M_EXT_WRITABLE(m) (!M_READONLY(m))
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#endif /* __NetBSD__ */
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/*
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* 4. mbuf packet-header/packet-tag semantics.
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* Sam Leffler explains, in private email, some problems with
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* M_COPY_PKTHDR(), and why FreeBSD deprecated it and replaced it
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* with new, explicit macros M_MOVE_PKTHDR()/M_DUP_PKTHDR().
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* he original fast-ipsec source uses M_MOVE_PKTHDR.
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* NetBSD currently still uses M_COPY_PKTHDR(), so we define
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* M_MOVE_PKTHDR in terms of M_COPY_PKTHDR(). Fast-IPsec
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* will delete the source mbuf shortly after copying packet tags,
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* so we are safe for fast-ipsec but not in general..
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*/
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#ifdef __NetBSD__
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#define M_MOVE_PKTHDR(_f, _t) M_COPY_PKTHDR(_f, _t)
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#endif /* __NetBSD__ */
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/*
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* 5. Fast mbuf-cluster allocation.
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* FreeBSD 4.6 introduce m_getcl(), which performs `fast' allocation
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* mbuf clusters from a cache of recently-freed clusters. (If the cache
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* is empty, new clusters are allocated en-masse).
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* On NetBSD, for now, implement the `cache' as an inline function
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*using normal NetBSD mbuf/cluster allocation macros. Replace this
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* with fast-cache code, if and when NetBSD implements one.
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*/
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#ifdef __NetBSD__
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static __inline struct mbuf *
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m_getcl(int how, short type, int flags)
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{
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struct mbuf *mp;
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if (flags & M_PKTHDR)
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MGETHDR(mp, how, type);
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else
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MGET(mp, how, type);
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if (mp == NULL)
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return NULL;
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MCLGET(mp, how);
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if ((mp->m_flags & M_EXT) == 0) {
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m_free(mp);
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mp = NULL;
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}
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return mp;
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}
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#endif /* __NetBSD__ */
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/*
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* 6. Network output macros
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* FreeBSD uses the IF_HANDOFF(), which raises SPL, enqueues
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* a packet, and updates interface counters. NetBSD has IFQ_ENQUE(),
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* which leaves SPL changes up to the caller.
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* For now, we provide an emulation of IF_HANOOFF() which works
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* for protocol input queues.
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*/
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#ifdef __FreeBSD__
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/* nothing to do */
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#endif /* __FreeBSD__ */
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#ifdef __NetBSD__
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#define IF_HANDOFF(ifq, m, f) if_handoff(ifq, m, f, 0)
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#include <net/if.h>
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static __inline int
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if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
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{
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int need_if_start = 0;
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int s = splnet();
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if (IF_QFULL(ifq)) {
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IF_DROP(ifq);
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splx(s);
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m_freem(m);
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return (0);
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}
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if (ifp != NULL) {
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ifp->if_obytes += m->m_pkthdr.len + adjust;
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if (m->m_flags & M_MCAST)
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ifp->if_omcasts++;
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need_if_start = !(ifp->if_flags & IFF_OACTIVE);
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}
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IF_ENQUEUE(ifq, m);
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if (need_if_start)
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(*ifp->if_start)(ifp);
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splx(s);
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return (1);
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}
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#endif /* __NetBSD__ */
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/*
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* 7. Elapsed Time: time_second as time in seconds.
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* Original FreeBSD fast-ipsec code references a FreeBSD kernel global,
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* time_second(). NetBSD: kludge #define to use time_mono_time.tv_sec.
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*/
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#ifdef __NetBSD__
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#include <sys/kernel.h>
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#define time_second mono_time.tv_sec
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#endif /* __NetBSD__ */
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/* protosw glue */
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#ifdef __NetBSD__
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#include <sys/protosw.h>
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#define ipprotosw protosw
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#endif /* __NetBSD__ */
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/*
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* 8. Test for "privileged" socket opened by superuser.
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* FreeBSD tests ((so)->so_cred && (so)->so_cred.cr_uid == 0),
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* NetBSD (1.6N) tests (so)->so_uid == 0).
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* This difference is wrapped inside the IPSEC_PRIVILEGED_SO() macro.
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*
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*/
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#ifdef __FreeBSD__
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#define IPSEC_PRIVILEGED_SO(so) ((so)->so_cred && (so)->so_cred.cr_uid == 0)
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#endif /* __FreeBSD__ */
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#ifdef __NetBSD__
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/* superuser opened socket? */
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#define IPSEC_PRIVILEGED_SO(so) ((so)->so_uid == 0)
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#endif /* __NetBSD__ */
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/*
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* 9. Raw socket list
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* FreeBSD uses: listhead = rawcb_list, SLIST()-next field "list".
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* NetBSD uses: listhead = rawcb, SLIST()-next field "list"
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*
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* This version of fast-ipsec source code uses rawcb_list as the head,
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* and (to avoid namespace collisions) uses rcb_list as the "next" field.
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*/
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#ifdef __FreeBSD__
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#define rcb_list list
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#endif /* __FreeBSD__ */
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#ifdef __NetBSD__
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#define rawcb_list rawcb
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#endif /* __NetBSD__ */
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/*
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* 10. List of all known network interfaces.
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* FreeBSD has listhead in_ifaddrhead, with ia_link as link.
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* NetBSD has listhead in_ifaddr, with ia_list as link.
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* No name-clahses, so just #define the appropriate names on NetBSD.
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* NB: Is it worth introducing iterator (find-first-list/find-next-list)
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* functions or macros to encapsulate these?
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*/
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#ifdef __FreeBSD__
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/* nothing to do for raw interface list */
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#endif /* FreeBSD */
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#ifdef __NetBSD__
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#define ia_link ia_list
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#endif /* __NetBSD__ */
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/*
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* 11. Type of initialization functions.
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*/
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#ifdef __FreeBSD__
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#define INITFN static
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#endif
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#ifdef __NetBSD__
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#define INITFN extern
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#endif
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/*
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* 12. IPv6 support, and "generic" inpcb vs. IPv4 pcb vs. IPv6 pcb.
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* To IPv6 V4-mapped addresses (and the KAME-derived implementation
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* of IPv6 v4-mapped addresses) we must support limited polymorphism:
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* partway down the stack we detect an IPv6 protocol address is really
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* a mapped V4 address, and then start dispatching that address to
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* native IPv4 PCB lookup. In KAME-derived IPsec (including fas-ipsec)
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* some functions must handle arguments which (dynamically) may be either
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* a IPv4 pcb (struct inpcb *) or an IPv6 pcb (struct in6pcb *).
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*
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* In FreeBSD 4.x, sgtrucr in6pcb is syntactic sugar for struct inpcb,
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* so punning between struct inpcb* and struct in6pcb* is trivial.
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* NetBSD until recently used completely different structs for IPv4
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* and IPv6 PCBs. To simplify fast-ipsec coexisting with IPv6,
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* NetBSD's struct inpcb and struct in6pcb were changed to both have
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* common struct, struct inpcb_hdr, as their first member. NetBSD can
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* thus pass arguments as struct inpcb_hdr*, and dispatch on a v4/v6
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* flag in the inpcb_hdr at runtime.
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*
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* We hide the NetBSD-vs-FreeBSD differences inside the following abstraction:
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*
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* PCB_T: a macro name for a struct type which is used as a "generic"
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* argument for actual arguments an in4pcb or an in6pcb.
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*
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* PCB_FAMILY(p): given a "generic" pcb_t p, returns the protocol
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* family (AF_INET, AF_INET6) of the unperlying inpcb/in6pcb.
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*
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* PCB_TO_IN4PCB(p): given generic pcb_t *p, returns a struct inpcb *
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* PCB_TO_IN6PCB(p): given generic pcb_t *p, returns a struct in6pcb *
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*
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* IN4PCB_TO_PCB(inp): given a struct inpcb *inp, returns a pcb_t *
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* IN6PCB_TO_PCB(in6p): given a struct in6pcb *in6p, returns a pcb_t *
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*/
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#ifdef __FreeBSD__
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#define PCB_T struct inpcb
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#define PCB_FAMILY(p) ((p)->inp_socket->so_proto->pr_domain->dom_family)
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/* Convert generic pcb to IPv4/IPv6 pcb */
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#define PCB_TO_IN4PCB(p) (p)
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#define PCB_TO_IN6PCB(p) (p)
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/* Convert IPv4/IPv6 pcb to generic pcb, for callers of fast-ipsec */
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#define IN4PCB_TO_PCB(p) (p)
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#define IN6PCB_TO_PCB(p) (p)
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#endif /* __FreeBSD__ */
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#ifdef __NetBSD__
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#ifndef notyet
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# define PCB_T struct inpcb_hdr
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# define PCB_FAMILY(p) ((p)->inph_af)
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#else
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# define PCB_T struct inpcb
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# define PCB_FAMILY(p) ((p)->inp_head.inph_af)
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#endif
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#define PCB_TO_IN4PCB(p) ((struct inpcb *)(p))
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#define PCB_TO_IN6PCB(p) ((struct in6pcb *)(p))
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#define IN4PCB_TO_PCB(p) ((PCB_T *)(&(p)->inp_head))
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#define IN6PCB_TO_PCB(p) ((PCB_T *)(&(p)->in6p_head))
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#endif /* __NetBSD__ */
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/*
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* Differences that we don't attempt to hide:
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*
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* A. Initialization code. This is the largest difference of all.
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*
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* FreeBSD uses compile/link-time perl hackery to generate special
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* .o files with linker sections that give the moral equivalent of
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* C++ file-level-object constructors. NetBSD has no such facility.
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*
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* Either we implement it (ideally, in a way that can emulate
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* FreeBSD's SYSINIT() macros), or we must take other means
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* to have the per-file init functions called at some appropriate time.
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*
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* In the absence of SYSINIT(), all the file-level init functions
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* now have "extern" linkage. There is a new fast-ipsec init()
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* function which calls each of the per-file in an appropriate order.
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* init_main will arrange to call the fast-ipsec init function
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* after the crypto framework has registered its transforms (including
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* any autoconfigured hardware crypto accelerators) but before
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* initializing the network stack to send or receive packet.
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*
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* B. Protosw() differences.
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* CSRG-style BSD TCP/IP uses a generic protocol-dispatch-function
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* where the specific request is identified by an enum argument.
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* FreeBSD replaced that with an array of request-specific
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* function pointers.
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*
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* These differences affect the handlers for key-protocol user requests
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* so pervasively that I gave up on the fast-ipsec code, and re-worked the
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* NetBSD KAME code to match the (relative few) API differences
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* between NetBSD and FreeBSD's KAME netkey, and Fast-IPsec netkey.
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*
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* C. Timeout() versus callout(9):
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* The FreeBSD 4.x netipsec/ code still uses timeout().
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* FreeBSD 4.7 has callout(9), so I just replaced
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* timeout_*() with the nearest callout_*() equivalents,
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* and added a callout handle to the ipsec context.
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*
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* D. SPL name differences.
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* FreeBSD splnet() equates directly to NetBSD's splsoftnet();
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* FreeBSD uses splimp() where (for networking) NetBSD would use splnet().
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*/
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#endif /* NETIPSEC_OSDEP_H */
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