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NetBSD/sys/netatalk/at_control.c
dyoung de87fe677d *** Summary *** 
When a link-layer address changes (e.g., ifconfig ex0 link
02🇩🇪ad:be:ef:02 active), send a gratuitous ARP and/or a Neighbor
Advertisement to update the network-/link-layer address bindings
on our LAN peers.

Refuse a change of ethernet address to the address 00:00:00:00:00:00
or to any multicast/broadcast address.  (Thanks matt@.)

Reorder ifnet ioctl operations so that driver ioctls may inherit
the functions of their "class"---ether_ioctl(), fddi_ioctl(), et
cetera---and the class ioctls may inherit from the generic ioctl,
ifioctl_common(), but both driver- and class-ioctls may override
the generic behavior.  Make network drivers share more code.

Distinguish a "factory" link-layer address from others for the
purposes of both protecting that address from deletion and computing
EUI64.

Return consistent, appropriate error codes from network drivers.

Improve readability.  KNF.

*** Details ***

In if_attach(), always initialize the interface ioctl routine,
ifnet->if_ioctl, if the driver has not already initialized it.
Delete if_ioctl == NULL tests everywhere else, because it cannot
happen.

In the ioctl routines of network interfaces, inherit common ioctl
behaviors by calling either ifioctl_common() or whichever ioctl
routine is appropriate for the class of interface---e.g., ether_ioctl()
for ethernets.

Stop (ab)using SIOCSIFADDR and start to use SIOCINITIFADDR.  In
the user->kernel interface, SIOCSIFADDR's argument was an ifreq,
but on the protocol->ifnet interface, SIOCSIFADDR's argument was
an ifaddr.  That was confusing, and it would work against me as I
make it possible for a network interface to overload most ioctls.
On the protocol->ifnet interface, replace SIOCSIFADDR with
SIOCINITIFADDR.  In ifioctl(), return EPERM if userland tries to
invoke SIOCINITIFADDR.

In ifioctl(), give the interface the first shot at handling most
interface ioctls, and give the protocol the second shot, instead
of the other way around. Finally, let compatibility code (COMPAT_OSOCK)
take a shot.

Pull device initialization out of switch statements under
SIOCINITIFADDR.  For example, pull ..._init() out of any switch
statement that looks like this:

        switch (...->sa_family) {
        case ...:
                ..._init();
                ...
                break;
        ...
        default:
                ..._init();
                ...
                break;
        }

Rewrite many if-else clauses that handle all permutations of IFF_UP
and IFF_RUNNING to use a switch statement,

        switch (x & (IFF_UP|IFF_RUNNING)) {
        case 0:
                ...
                break;
        case IFF_RUNNING:
                ...
                break;
        case IFF_UP:
                ...
                break;
        case IFF_UP|IFF_RUNNING:
                ...
                break;
        }

unifdef lots of code containing #ifdef FreeBSD, #ifdef NetBSD, and
#ifdef SIOCSIFMTU, especially in fwip(4) and in ndis(4).

In ipw(4), remove an if_set_sadl() call that is out of place.

In nfe(4), reuse the jumbo MTU logic in ether_ioctl().

Let ethernets register a callback for setting h/w state such as
promiscuous mode and the multicast filter in accord with a change
in the if_flags: ether_set_ifflags_cb() registers a callback that
returns ENETRESET if the caller should reset the ethernet by calling
if_init(), 0 on success, != 0 on failure.  Pull common code from
ex(4), gem(4), nfe(4), sip(4), tlp(4), vge(4) into ether_ioctl(),
and register if_flags callbacks for those drivers.

Return ENOTTY instead of EINVAL for inappropriate ioctls.  In
zyd(4), use ENXIO instead of ENOTTY to indicate that the device is
not any longer attached.

Add to if_set_sadl() a boolean 'factory' argument that indicates
whether a link-layer address was assigned by the factory or some
other source.  In a comment, recommend using the factory address
for generating an EUI64, and update in6_get_hw_ifid() to prefer a
factory address to any other link-layer address.

Add a routing message, RTM_LLINFO_UPD, that tells protocols to
update the binding of network-layer addresses to link-layer addresses.
Implement this message in IPv4 and IPv6 by sending a gratuitous
ARP or a neighbor advertisement, respectively.  Generate RTM_LLINFO_UPD
messages on a change of an interface's link-layer address.

In ether_ioctl(), do not let SIOCALIFADDR set a link-layer address
that is broadcast/multicast or equal to 00:00:00:00:00:00.

Make ether_ioctl() call ifioctl_common() to handle ioctls that it
does not understand.

In gif(4), initialize if_softc and use it, instead of assuming that
the gif_softc and ifp overlap.

Let ifioctl_common() handle SIOCGIFADDR.

Sprinkle rtcache_invariants(), which checks on DIAGNOSTIC kernels
that certain invariants on a struct route are satisfied.

In agr(4), rewrite agr_ioctl_filter() to be a bit more explicit
about the ioctls that we do not allow on an agr(4) member interface.

bzero -> memset.  Delete unnecessary casts to void *.  Use
sockaddr_in_init() and sockaddr_in6_init().  Compare pointers with
NULL instead of "testing truth".  Replace some instances of (type
*)0 with NULL.  Change some K&R prototypes to ANSI C, and join
lines.
2008-11-07 00:20:01 +00:00

867 lines
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/* $NetBSD: at_control.c,v 1.27 2008/11/07 00:20:18 dyoung Exp $ */
/*
* Copyright (c) 1990,1994 Regents of The University of Michigan.
* All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software and
* its documentation for any purpose and without fee is hereby granted,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear
* in supporting documentation, and that the name of The University
* of Michigan not be used in advertising or publicity pertaining to
* distribution of the software without specific, written prior
* permission. This software is supplied as is without expressed or
* implied warranties of any kind.
*
* This product includes software developed by the University of
* California, Berkeley and its contributors.
*
* Research Systems Unix Group
* The University of Michigan
* c/o Wesley Craig
* 535 W. William Street
* Ann Arbor, Michigan
* +1-313-764-2278
* netatalk@umich.edu
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: at_control.c,v 1.27 2008/11/07 00:20:18 dyoung Exp $");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/errno.h>
#include <sys/ioctl.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/kauth.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_ether.h>
#include <netinet/in.h>
#undef s_net
#include <netatalk/at.h>
#include <netatalk/at_var.h>
#include <netatalk/aarp.h>
#include <netatalk/phase2.h>
#include <netatalk/at_extern.h>
static int aa_dorangeroute(struct ifaddr * ifa,
u_int first, u_int last, int cmd);
static int aa_addsingleroute(struct ifaddr * ifa,
struct at_addr * addr, struct at_addr * mask);
static int aa_delsingleroute(struct ifaddr * ifa,
struct at_addr * addr, struct at_addr * mask);
static int aa_dosingleroute(struct ifaddr * ifa, struct at_addr * addr,
struct at_addr * mask, int cmd, int flags);
static int at_scrub(struct ifnet * ifp, struct at_ifaddr * aa);
static int at_ifinit(struct ifnet *, struct at_ifaddr *,
const struct sockaddr_at *);
#if 0
static void aa_clean(void);
#endif
#define sateqaddr(a,b) ((a)->sat_len == (b)->sat_len && \
(a)->sat_family == (b)->sat_family && \
(a)->sat_addr.s_net == (b)->sat_addr.s_net && \
(a)->sat_addr.s_node == (b)->sat_addr.s_node )
int
at_control(cmd, data, ifp, l)
u_long cmd;
void * data;
struct ifnet *ifp;
struct lwp *l;
{
struct ifreq *ifr = (struct ifreq *) data;
const struct sockaddr_at *csat;
struct netrange *nr;
const struct netrange *cnr;
struct at_aliasreq *ifra = (struct at_aliasreq *) data;
struct at_ifaddr *aa0;
struct at_ifaddr *aa = 0;
/*
* If we have an ifp, then find the matching at_ifaddr if it exists
*/
if (ifp)
for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next)
if (aa->aa_ifp == ifp)
break;
/*
* In this first switch table we are basically getting ready for
* the second one, by getting the atalk-specific things set up
* so that they start to look more similar to other protocols etc.
*/
switch (cmd) {
case SIOCAIFADDR:
case SIOCDIFADDR:
/*
* If we have an appletalk sockaddr, scan forward of where
* we are now on the at_ifaddr list to find one with a matching
* address on this interface.
* This may leave aa pointing to the first address on the
* NEXT interface!
*/
if (ifra->ifra_addr.sat_family == AF_APPLETALK) {
for (; aa; aa = aa->aa_list.tqe_next)
if (aa->aa_ifp == ifp &&
sateqaddr(&aa->aa_addr, &ifra->ifra_addr))
break;
}
/*
* If we a retrying to delete an addres but didn't find such,
* then return with an error
*/
if (cmd == SIOCDIFADDR && aa == 0)
return (EADDRNOTAVAIL);
/* FALLTHROUGH */
case SIOCSIFADDR:
/*
* If we are not superuser, then we don't get to do these
* ops.
*/
if (l && kauth_authorize_network(l->l_cred,
KAUTH_NETWORK_INTERFACE,
KAUTH_REQ_NETWORK_INTERFACE_SETPRIV, ifp, (void *)cmd,
NULL) != 0)
return (EPERM);
csat = satocsat(ifreq_getaddr(cmd, ifr));
cnr = (const struct netrange *)csat->sat_zero;
if (cnr->nr_phase == 1) {
/*
* Look for a phase 1 address on this interface.
* This may leave aa pointing to the first address on
* the NEXT interface!
*/
for (; aa; aa = aa->aa_list.tqe_next) {
if (aa->aa_ifp == ifp &&
(aa->aa_flags & AFA_PHASE2) == 0)
break;
}
} else { /* default to phase 2 */
/*
* Look for a phase 2 address on this interface.
* This may leave aa pointing to the first address on
* the NEXT interface!
*/
for (; aa; aa = aa->aa_list.tqe_next) {
if (aa->aa_ifp == ifp &&
(aa->aa_flags & AFA_PHASE2))
break;
}
}
if (ifp == 0)
panic("at_control");
/*
* If we failed to find an existing at_ifaddr entry, then we
* allocate a fresh one.
* XXX change this to use malloc
*/
if (aa == (struct at_ifaddr *) 0) {
aa = (struct at_ifaddr *)
malloc(sizeof(struct at_ifaddr), M_IFADDR,
M_WAITOK|M_ZERO);
if (aa == NULL)
return (ENOBUFS);
callout_init(&aa->aa_probe_ch, 0);
if ((aa0 = at_ifaddr.tqh_first) != NULL) {
/*
* Don't let the loopback be first, since the
* first address is the machine's default
* address for binding.
* If it is, stick ourself in front, otherwise
* go to the back of the list.
*/
if (aa0->aa_ifp->if_flags & IFF_LOOPBACK) {
TAILQ_INSERT_HEAD(&at_ifaddr, aa,
aa_list);
} else {
TAILQ_INSERT_TAIL(&at_ifaddr, aa,
aa_list);
}
} else {
TAILQ_INSERT_TAIL(&at_ifaddr, aa, aa_list);
}
IFAREF(&aa->aa_ifa);
/*
* Find the end of the interface's addresses
* and link our new one on the end
*/
ifa_insert(ifp, &aa->aa_ifa);
/*
* As the at_ifaddr contains the actual sockaddrs,
* and the ifaddr itself, link them al together
* correctly.
*/
aa->aa_ifa.ifa_addr =
(struct sockaddr *) &aa->aa_addr;
aa->aa_ifa.ifa_dstaddr =
(struct sockaddr *) &aa->aa_addr;
aa->aa_ifa.ifa_netmask =
(struct sockaddr *) &aa->aa_netmask;
/*
* Set/clear the phase 2 bit.
*/
if (cnr->nr_phase == 1)
aa->aa_flags &= ~AFA_PHASE2;
else
aa->aa_flags |= AFA_PHASE2;
/*
* and link it all together
*/
aa->aa_ifp = ifp;
} else {
/*
* If we DID find one then we clobber any routes
* dependent on it..
*/
at_scrub(ifp, aa);
}
break;
case SIOCGIFADDR:
csat = satocsat(ifreq_getaddr(cmd, ifr));
cnr = (const struct netrange *)csat->sat_zero;
if (cnr->nr_phase == 1) {
/*
* If the request is specifying phase 1, then
* only look at a phase one address
*/
for (; aa; aa = aa->aa_list.tqe_next) {
if (aa->aa_ifp == ifp &&
(aa->aa_flags & AFA_PHASE2) == 0)
break;
}
} else if (cnr->nr_phase == 2) {
/*
* If the request is specifying phase 2, then
* only look at a phase two address
*/
for (; aa; aa = aa->aa_list.tqe_next) {
if (aa->aa_ifp == ifp &&
(aa->aa_flags & AFA_PHASE2))
break;
}
} else {
/*
* default to everything
*/
for (; aa; aa = aa->aa_list.tqe_next) {
if (aa->aa_ifp == ifp)
break;
}
}
if (aa == (struct at_ifaddr *) 0)
return (EADDRNOTAVAIL);
break;
}
/*
* By the time this switch is run we should be able to assume that
* the "aa" pointer is valid when needed.
*/
switch (cmd) {
case SIOCGIFADDR: {
union {
struct sockaddr sa;
struct sockaddr_at sat;
} u;
/*
* copy the contents of the sockaddr blindly.
*/
sockaddr_copy(&u.sa, sizeof(u),
(const struct sockaddr *)&aa->aa_addr);
/*
* and do some cleanups
*/
nr = (struct netrange *)&u.sat.sat_zero;
nr->nr_phase = (aa->aa_flags & AFA_PHASE2) ? 2 : 1;
nr->nr_firstnet = aa->aa_firstnet;
nr->nr_lastnet = aa->aa_lastnet;
ifreq_setaddr(cmd, ifr, &u.sa);
break;
}
case SIOCSIFADDR:
return at_ifinit(ifp, aa,
(const struct sockaddr_at *)ifreq_getaddr(cmd, ifr));
case SIOCAIFADDR:
if (sateqaddr(&ifra->ifra_addr, &aa->aa_addr))
return 0;
return at_ifinit(ifp, aa,
(const struct sockaddr_at *)ifreq_getaddr(cmd, ifr));
case SIOCDIFADDR:
at_purgeaddr(&aa->aa_ifa);
break;
default:
return ENOTTY;
}
return (0);
}
void
at_purgeaddr(struct ifaddr *ifa)
{
struct ifnet *ifp = ifa->ifa_ifp;
struct at_ifaddr *aa = (void *) ifa;
/*
* scrub all routes.. didn't we just DO this? XXX yes, del it
* XXX above XXX not necessarily true anymore
*/
at_scrub(ifp, aa);
/*
* remove the ifaddr from the interface
*/
ifa_remove(ifp, &aa->aa_ifa);
TAILQ_REMOVE(&at_ifaddr, aa, aa_list);
IFAFREE(&aa->aa_ifa);
}
void
at_purgeif(struct ifnet *ifp)
{
if_purgeaddrs(ifp, AF_APPLETALK, at_purgeaddr);
}
/*
* Given an interface and an at_ifaddr (supposedly on that interface) remove
* any routes that depend on this. Why ifp is needed I'm not sure, as
* aa->at_ifaddr.ifa_ifp should be the same.
*/
static int
at_scrub(ifp, aa)
struct ifnet *ifp;
struct at_ifaddr *aa;
{
int error = 0;
if (aa->aa_flags & AFA_ROUTE) {
if (ifp->if_flags & IFF_LOOPBACK)
error = aa_delsingleroute(&aa->aa_ifa,
&aa->aa_addr.sat_addr, &aa->aa_netmask.sat_addr);
else if (ifp->if_flags & IFF_POINTOPOINT)
error = rtinit(&aa->aa_ifa, RTM_DELETE, RTF_HOST);
else if (ifp->if_flags & IFF_BROADCAST)
error = aa_dorangeroute(&aa->aa_ifa,
ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
RTM_DELETE);
aa->aa_ifa.ifa_flags &= ~IFA_ROUTE;
aa->aa_flags &= ~AFA_ROUTE;
}
return error;
}
/*
* given an at_ifaddr,a sockaddr_at and an ifp,
* bang them all together at high speed and see what happens
*/
static int
at_ifinit(ifp, aa, sat)
struct ifnet *ifp;
struct at_ifaddr *aa;
const struct sockaddr_at *sat;
{
struct netrange nr, onr;
struct sockaddr_at oldaddr;
int s = splnet(), error = 0, i, j;
int netinc, nodeinc, nnets;
u_short net;
/*
* save the old addresses in the at_ifaddr just in case we need them.
*/
oldaddr = aa->aa_addr;
onr.nr_firstnet = aa->aa_firstnet;
onr.nr_lastnet = aa->aa_lastnet;
/*
* take the address supplied as an argument, and add it to the
* at_ifnet (also given). Remember ing to update
* those parts of the at_ifaddr that need special processing
*/
bzero(AA_SAT(aa), sizeof(struct sockaddr_at));
bcopy(sat->sat_zero, &nr, sizeof(struct netrange));
bcopy(sat->sat_zero, AA_SAT(aa)->sat_zero, sizeof(struct netrange));
nnets = ntohs(nr.nr_lastnet) - ntohs(nr.nr_firstnet) + 1;
aa->aa_firstnet = nr.nr_firstnet;
aa->aa_lastnet = nr.nr_lastnet;
#ifdef NETATALKDEBUG
printf("at_ifinit: %s: %u.%u range %u-%u phase %d\n",
ifp->if_xname,
ntohs(sat->sat_addr.s_net), sat->sat_addr.s_node,
ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet),
(aa->aa_flags & AFA_PHASE2) ? 2 : 1);
#endif
/*
* We could eliminate the need for a second phase 1 probe (post
* autoconf) if we check whether we're resetting the node. Note
* that phase 1 probes use only nodes, not net.node pairs. Under
* phase 2, both the net and node must be the same.
*/
AA_SAT(aa)->sat_len = sat->sat_len;
AA_SAT(aa)->sat_family = AF_APPLETALK;
if (ifp->if_flags & IFF_LOOPBACK) {
AA_SAT(aa)->sat_addr.s_net = sat->sat_addr.s_net;
AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
#if 0
} else if (fp->if_flags & IFF_POINTOPOINT) {
/* unimplemented */
/*
* we'd have to copy the dstaddr field over from the sat
* but it's not clear that it would contain the right info..
*/
#endif
} else {
/*
* We are a normal (probably ethernet) interface.
* apply the new address to the interface structures etc.
* We will probe this address on the net first, before
* applying it to ensure that it is free.. If it is not, then
* we will try a number of other randomly generated addresses
* in this net and then increment the net. etc.etc. until
* we find an unused address.
*/
aa->aa_flags |= AFA_PROBING; /* if not loopback we Must
* probe? */
if (aa->aa_flags & AFA_PHASE2) {
if (sat->sat_addr.s_net == ATADDR_ANYNET) {
/*
* If we are phase 2, and the net was not
* specified * then we select a random net
* within the supplied netrange.
* XXX use /dev/random?
*/
if (nnets != 1) {
net = ntohs(nr.nr_firstnet) +
time_second % (nnets - 1);
} else {
net = ntohs(nr.nr_firstnet);
}
} else {
/*
* if a net was supplied, then check that it
* is within the netrange. If it is not then
* replace the old values and return an error
*/
if (ntohs(sat->sat_addr.s_net) <
ntohs(nr.nr_firstnet) ||
ntohs(sat->sat_addr.s_net) >
ntohs(nr.nr_lastnet)) {
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx(s);
return (EINVAL);
}
/*
* otherwise just use the new net number..
*/
net = ntohs(sat->sat_addr.s_net);
}
} else {
/*
* we must be phase one, so just use whatever we were
* given. I guess it really isn't going to be used...
* RIGHT?
*/
net = ntohs(sat->sat_addr.s_net);
}
/*
* set the node part of the address into the ifaddr. If it's
* not specified, be random about it... XXX use /dev/random?
*/
if (sat->sat_addr.s_node == ATADDR_ANYNODE) {
AA_SAT(aa)->sat_addr.s_node = time_second;
} else {
AA_SAT(aa)->sat_addr.s_node = sat->sat_addr.s_node;
}
/*
* step through the nets in the range starting at the
* (possibly random) start point.
*/
for (i = nnets, netinc = 1; i > 0; net = ntohs(nr.nr_firstnet) +
((net - ntohs(nr.nr_firstnet) + netinc) % nnets), i--) {
AA_SAT(aa)->sat_addr.s_net = htons(net);
/*
* using a rather strange stepping method,
* stagger through the possible node addresses
* Once again, starting at the (possibly random)
* initial node address.
*/
for (j = 0, nodeinc = time_second | 1; j < 256;
j++, AA_SAT(aa)->sat_addr.s_node += nodeinc) {
if (AA_SAT(aa)->sat_addr.s_node > 253 ||
AA_SAT(aa)->sat_addr.s_node < 1) {
continue;
}
aa->aa_probcnt = 10;
/*
* start off the probes as an asynchronous
* activity. though why wait 200mSec?
*/
callout_reset(&aa->aa_probe_ch, hz / 5,
aarpprobe, ifp);
if (tsleep(aa, PPAUSE | PCATCH, "at_ifinit",
0)) {
/*
* theoretically we shouldn't time out
* here so if we returned with an error.
*/
printf("at_ifinit: timeout?!\n");
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx(s);
return (EINTR);
}
/*
* The async activity should have woken us
* up. We need to see if it was successful in
* finding a free spot, or if we need to
* iterate to the next address to try.
*/
if ((aa->aa_flags & AFA_PROBING) == 0)
break;
}
/*
* of course we need to break out through two loops...
*/
if ((aa->aa_flags & AFA_PROBING) == 0)
break;
/* reset node for next network */
AA_SAT(aa)->sat_addr.s_node = time_second;
}
/*
* if we are still trying to probe, then we have finished all
* the possible addresses, so we need to give up
*/
if (aa->aa_flags & AFA_PROBING) {
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx(s);
return (EADDRINUSE);
}
}
/*
* Now that we have selected an address, we need to tell the
* interface about it, just in case it needs to adjust something.
*/
if ((error = (*ifp->if_ioctl)(ifp, SIOCINITIFADDR, aa)) != 0) {
/*
* of course this could mean that it objects violently
* so if it does, we back out again..
*/
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx(s);
return (error);
}
/*
* set up the netmask part of the at_ifaddr and point the appropriate
* pointer in the ifaddr to it. probably pointless, but what the
* heck.. XXX
*/
bzero(&aa->aa_netmask, sizeof(aa->aa_netmask));
aa->aa_netmask.sat_len = sizeof(struct sockaddr_at);
aa->aa_netmask.sat_family = AF_APPLETALK;
aa->aa_netmask.sat_addr.s_net = 0xffff;
aa->aa_netmask.sat_addr.s_node = 0;
#if 0
aa->aa_ifa.ifa_netmask = (struct sockaddr *) &(aa->aa_netmask);/* XXX */
#endif
/*
* Initialize broadcast (or remote p2p) address
*/
bzero(&aa->aa_broadaddr, sizeof(aa->aa_broadaddr));
aa->aa_broadaddr.sat_len = sizeof(struct sockaddr_at);
aa->aa_broadaddr.sat_family = AF_APPLETALK;
aa->aa_ifa.ifa_metric = ifp->if_metric;
if (ifp->if_flags & IFF_BROADCAST) {
aa->aa_broadaddr.sat_addr.s_net = htons(0);
aa->aa_broadaddr.sat_addr.s_node = 0xff;
aa->aa_ifa.ifa_broadaddr =
(struct sockaddr *) &aa->aa_broadaddr;
/* add the range of routes needed */
error = aa_dorangeroute(&aa->aa_ifa,
ntohs(aa->aa_firstnet), ntohs(aa->aa_lastnet), RTM_ADD);
} else if (ifp->if_flags & IFF_POINTOPOINT) {
struct at_addr rtaddr, rtmask;
bzero(&rtaddr, sizeof(rtaddr));
bzero(&rtmask, sizeof(rtmask));
/* fill in the far end if we know it here XXX */
aa->aa_ifa.ifa_dstaddr = (struct sockaddr *) & aa->aa_dstaddr;
error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
} else if (ifp->if_flags & IFF_LOOPBACK) {
struct at_addr rtaddr, rtmask;
bzero(&rtaddr, sizeof(rtaddr));
bzero(&rtmask, sizeof(rtmask));
rtaddr.s_net = AA_SAT(aa)->sat_addr.s_net;
rtaddr.s_node = AA_SAT(aa)->sat_addr.s_node;
rtmask.s_net = 0xffff;
rtmask.s_node = 0x0;
error = aa_addsingleroute(&aa->aa_ifa, &rtaddr, &rtmask);
}
/*
* of course if we can't add these routes we back out, but it's getting
* risky by now XXX
*/
if (error) {
at_scrub(ifp, aa);
aa->aa_addr = oldaddr;
aa->aa_firstnet = onr.nr_firstnet;
aa->aa_lastnet = onr.nr_lastnet;
splx(s);
return (error);
}
/*
* note that the address has a route associated with it....
*/
aa->aa_ifa.ifa_flags |= IFA_ROUTE;
aa->aa_flags |= AFA_ROUTE;
splx(s);
return (0);
}
/*
* check whether a given address is a broadcast address for us..
*/
int
at_broadcast(const struct sockaddr_at *sat)
{
struct at_ifaddr *aa;
/*
* If the node is not right, it can't be a broadcast
*/
if (sat->sat_addr.s_node != ATADDR_BCAST)
return 0;
/*
* If the node was right then if the net is right, it's a broadcast
*/
if (sat->sat_addr.s_net == ATADDR_ANYNET)
return 1;
/*
* failing that, if the net is one we have, it's a broadcast as well.
*/
for (aa = at_ifaddr.tqh_first; aa; aa = aa->aa_list.tqe_next) {
if ((aa->aa_ifp->if_flags & IFF_BROADCAST)
&& (ntohs(sat->sat_addr.s_net) >= ntohs(aa->aa_firstnet)
&& ntohs(sat->sat_addr.s_net) <= ntohs(aa->aa_lastnet)))
return 1;
}
return 0;
}
/*
* aa_dorangeroute()
*
* Add a route for a range of networks from bot to top - 1.
* Algorithm:
*
* Split the range into two subranges such that the middle
* of the two ranges is the point where the highest bit of difference
* between the two addresses, makes it's transition
* Each of the upper and lower ranges might not exist, or might be
* representable by 1 or more netmasks. In addition, if both
* ranges can be represented by the same netmask, then teh can be merged
* by using the next higher netmask..
*/
static int
aa_dorangeroute(ifa, bot, top, cmd)
struct ifaddr *ifa;
u_int bot;
u_int top;
int cmd;
{
u_int mask1;
struct at_addr addr;
struct at_addr mask;
int error;
/*
* slight sanity check
*/
if (bot > top)
return (EINVAL);
addr.s_node = 0;
mask.s_node = 0;
/*
* just start out with the lowest boundary
* and keep extending the mask till it's too big.
*/
while (bot <= top) {
mask1 = 1;
while (((bot & ~mask1) >= bot)
&& ((bot | mask1) <= top)) {
mask1 <<= 1;
mask1 |= 1;
}
mask1 >>= 1;
mask.s_net = htons(~mask1);
addr.s_net = htons(bot);
if (cmd == RTM_ADD) {
error = aa_addsingleroute(ifa, &addr, &mask);
if (error) {
/* XXX clean up? */
return (error);
}
} else {
error = aa_delsingleroute(ifa, &addr, &mask);
}
bot = (bot | mask1) + 1;
}
return 0;
}
static int
aa_addsingleroute(ifa, addr, mask)
struct ifaddr *ifa;
struct at_addr *addr;
struct at_addr *mask;
{
int error;
#ifdef NETATALKDEBUG
printf("aa_addsingleroute: %x.%x mask %x.%x ...",
ntohs(addr->s_net), addr->s_node,
ntohs(mask->s_net), mask->s_node);
#endif
error = aa_dosingleroute(ifa, addr, mask, RTM_ADD, RTF_UP);
#ifdef NETATALKDEBUG
if (error)
printf("aa_addsingleroute: error %d\n", error);
#endif
return (error);
}
static int
aa_delsingleroute(ifa, addr, mask)
struct ifaddr *ifa;
struct at_addr *addr;
struct at_addr *mask;
{
int error;
#ifdef NETATALKDEBUG
printf("aa_delsingleroute: %x.%x mask %x.%x ...",
ntohs(addr->s_net), addr->s_node,
ntohs(mask->s_net), mask->s_node);
#endif
error = aa_dosingleroute(ifa, addr, mask, RTM_DELETE, 0);
#ifdef NETATALKDEBUG
if (error)
printf("aa_delsingleroute: error %d\n", error);
#endif
return (error);
}
static int
aa_dosingleroute(ifa, at_addr, at_mask, cmd, flags)
struct ifaddr *ifa;
struct at_addr *at_addr;
struct at_addr *at_mask;
int cmd;
int flags;
{
struct sockaddr_at addr, mask, *gate;
bzero(&addr, sizeof(addr));
bzero(&mask, sizeof(mask));
addr.sat_family = AF_APPLETALK;
addr.sat_len = sizeof(struct sockaddr_at);
addr.sat_addr.s_net = at_addr->s_net;
addr.sat_addr.s_node = at_addr->s_node;
mask.sat_family = AF_APPLETALK;
mask.sat_len = sizeof(struct sockaddr_at);
mask.sat_addr.s_net = at_mask->s_net;
mask.sat_addr.s_node = at_mask->s_node;
if (at_mask->s_node) {
gate = satosat(ifa->ifa_dstaddr);
flags |= RTF_HOST;
} else {
gate = satosat(ifa->ifa_addr);
}
#ifdef NETATALKDEBUG
printf("on %s %x.%x\n", (flags & RTF_HOST) ? "host" : "net",
ntohs(gate->sat_addr.s_net), gate->sat_addr.s_node);
#endif
return (rtrequest(cmd, (struct sockaddr *) &addr,
(struct sockaddr *) gate, (struct sockaddr *) &mask, flags, NULL));
}
#if 0
static void
aa_clean()
{
struct at_ifaddr *aa;
struct ifaddr *ifa;
struct ifnet *ifp;
while ((aa = TAILQ_FIRST(&at_ifaddr)) != NULL) {
TAILQ_REMOVE(&at_ifaddr, aa, aa_list);
ifp = aa->aa_ifp;
at_scrub(ifp, aa);
IFADDR_FOREACH(ifa, ifp) {
if (ifa == &aa->aa_ifa)
break;
}
if (ifa == NULL)
panic("aa not present");
ifa_remove(ifp, ifa);
}
}
#endif
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