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ddp.c
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ddp.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* DDP: An implementation of the AppleTalk DDP protocol for
* Ethernet 'ELAP'.
*
* Alan Cox <alan@lxorguk.ukuu.org.uk>
*
* With more than a little assistance from
*
* Wesley Craig <netatalk@umich.edu>
*
* Fixes:
* Neil Horman : Added missing device ioctls
* Michael Callahan : Made routing work
* Wesley Craig : Fix probing to listen to a
* passed node id.
* Alan Cox : Added send/recvmsg support
* Alan Cox : Moved at. to protinfo in
* socket.
* Alan Cox : Added firewall hooks.
* Alan Cox : Supports new ARPHRD_LOOPBACK
* Christer Weinigel : Routing and /proc fixes.
* Bradford Johnson : LocalTalk.
* Tom Dyas : Module support.
* Alan Cox : Hooks for PPP (based on the
* LocalTalk hook).
* Alan Cox : Posix bits
* Alan Cox/Mike Freeman : Possible fix to NBP problems
* Bradford Johnson : IP-over-DDP (experimental)
* Jay Schulist : Moved IP-over-DDP to its own
* driver file. (ipddp.c & ipddp.h)
* Jay Schulist : Made work as module with
* AppleTalk drivers, cleaned it.
* Rob Newberry : Added proxy AARP and AARP
* procfs, moved probing to AARP
* module.
* Adrian Sun/
* Michael Zuelsdorff : fix for net.0 packets. don't
* allow illegal ether/tokentalk
* port assignment. we lose a
* valid localtalk port as a
* result.
* Arnaldo C. de Melo : Cleanup, in preparation for
* shared skb support 8)
* Arnaldo C. de Melo : Move proc stuff to atalk_proc.c,
* use seq_file
*/
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/if_arp.h>
#include <linux/termios.h> /* For TIOCOUTQ/INQ */
#include <linux/compat.h>
#include <linux/slab.h>
#include <net/datalink.h>
#include <net/psnap.h>
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/route.h>
#include <linux/atalk.h>
#include <linux/highmem.h>
struct datalink_proto *ddp_dl, *aarp_dl;
static const struct proto_ops atalk_dgram_ops;
/**************************************************************************\
* *
* Handlers for the socket list. *
* *
\**************************************************************************/
HLIST_HEAD(atalk_sockets);
DEFINE_RWLOCK(atalk_sockets_lock);
static inline void __atalk_insert_socket(struct sock *sk)
{
sk_add_node(sk, &atalk_sockets);
}
static inline void atalk_remove_socket(struct sock *sk)
{
write_lock_bh(&atalk_sockets_lock);
sk_del_node_init(sk);
write_unlock_bh(&atalk_sockets_lock);
}
static struct sock *atalk_search_socket(struct sockaddr_at *to,
struct atalk_iface *atif)
{
struct sock *s;
read_lock_bh(&atalk_sockets_lock);
sk_for_each(s, &atalk_sockets) {
struct atalk_sock *at = at_sk(s);
if (to->sat_port != at->src_port)
continue;
if (to->sat_addr.s_net == ATADDR_ANYNET &&
to->sat_addr.s_node == ATADDR_BCAST)
goto found;
if (to->sat_addr.s_net == at->src_net &&
(to->sat_addr.s_node == at->src_node ||
to->sat_addr.s_node == ATADDR_BCAST ||
to->sat_addr.s_node == ATADDR_ANYNODE))
goto found;
/* XXXX.0 -- we got a request for this router. make sure
* that the node is appropriately set. */
if (to->sat_addr.s_node == ATADDR_ANYNODE &&
to->sat_addr.s_net != ATADDR_ANYNET &&
atif->address.s_node == at->src_node) {
to->sat_addr.s_node = atif->address.s_node;
goto found;
}
}
s = NULL;
found:
read_unlock_bh(&atalk_sockets_lock);
return s;
}
/**
* atalk_find_or_insert_socket - Try to find a socket matching ADDR
* @sk: socket to insert in the list if it is not there already
* @sat: address to search for
*
* Try to find a socket matching ADDR in the socket list, if found then return
* it. If not, insert SK into the socket list.
*
* This entire operation must execute atomically.
*/
static struct sock *atalk_find_or_insert_socket(struct sock *sk,
struct sockaddr_at *sat)
{
struct sock *s;
struct atalk_sock *at;
write_lock_bh(&atalk_sockets_lock);
sk_for_each(s, &atalk_sockets) {
at = at_sk(s);
if (at->src_net == sat->sat_addr.s_net &&
at->src_node == sat->sat_addr.s_node &&
at->src_port == sat->sat_port)
goto found;
}
s = NULL;
__atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
found:
write_unlock_bh(&atalk_sockets_lock);
return s;
}
static void atalk_destroy_timer(struct timer_list *t)
{
struct sock *sk = from_timer(sk, t, sk_timer);
if (sk_has_allocations(sk)) {
sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
add_timer(&sk->sk_timer);
} else
sock_put(sk);
}
static inline void atalk_destroy_socket(struct sock *sk)
{
atalk_remove_socket(sk);
skb_queue_purge(&sk->sk_receive_queue);
if (sk_has_allocations(sk)) {
timer_setup(&sk->sk_timer, atalk_destroy_timer, 0);
sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
add_timer(&sk->sk_timer);
} else
sock_put(sk);
}
/**************************************************************************\
* *
* Routing tables for the AppleTalk socket layer. *
* *
\**************************************************************************/
/* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
struct atalk_route *atalk_routes;
DEFINE_RWLOCK(atalk_routes_lock);
struct atalk_iface *atalk_interfaces;
DEFINE_RWLOCK(atalk_interfaces_lock);
/* For probing devices or in a routerless network */
struct atalk_route atrtr_default;
/* AppleTalk interface control */
/*
* Drop a device. Doesn't drop any of its routes - that is the caller's
* problem. Called when we down the interface or delete the address.
*/
static void atif_drop_device(struct net_device *dev)
{
struct atalk_iface **iface = &atalk_interfaces;
struct atalk_iface *tmp;
write_lock_bh(&atalk_interfaces_lock);
while ((tmp = *iface) != NULL) {
if (tmp->dev == dev) {
*iface = tmp->next;
dev_put(dev);
kfree(tmp);
dev->atalk_ptr = NULL;
} else
iface = &tmp->next;
}
write_unlock_bh(&atalk_interfaces_lock);
}
static struct atalk_iface *atif_add_device(struct net_device *dev,
struct atalk_addr *sa)
{
struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
if (!iface)
goto out;
dev_hold(dev);
iface->dev = dev;
dev->atalk_ptr = iface;
iface->address = *sa;
iface->status = 0;
write_lock_bh(&atalk_interfaces_lock);
iface->next = atalk_interfaces;
atalk_interfaces = iface;
write_unlock_bh(&atalk_interfaces_lock);
out:
return iface;
}
/* Perform phase 2 AARP probing on our tentative address */
static int atif_probe_device(struct atalk_iface *atif)
{
int netrange = ntohs(atif->nets.nr_lastnet) -
ntohs(atif->nets.nr_firstnet) + 1;
int probe_net = ntohs(atif->address.s_net);
int probe_node = atif->address.s_node;
int netct, nodect;
/* Offset the network we start probing with */
if (probe_net == ATADDR_ANYNET) {
probe_net = ntohs(atif->nets.nr_firstnet);
if (netrange)
probe_net += jiffies % netrange;
}
if (probe_node == ATADDR_ANYNODE)
probe_node = jiffies & 0xFF;
/* Scan the networks */
atif->status |= ATIF_PROBE;
for (netct = 0; netct <= netrange; netct++) {
/* Sweep the available nodes from a given start */
atif->address.s_net = htons(probe_net);
for (nodect = 0; nodect < 256; nodect++) {
atif->address.s_node = (nodect + probe_node) & 0xFF;
if (atif->address.s_node > 0 &&
atif->address.s_node < 254) {
/* Probe a proposed address */
aarp_probe_network(atif);
if (!(atif->status & ATIF_PROBE_FAIL)) {
atif->status &= ~ATIF_PROBE;
return 0;
}
}
atif->status &= ~ATIF_PROBE_FAIL;
}
probe_net++;
if (probe_net > ntohs(atif->nets.nr_lastnet))
probe_net = ntohs(atif->nets.nr_firstnet);
}
atif->status &= ~ATIF_PROBE;
return -EADDRINUSE; /* Network is full... */
}
/* Perform AARP probing for a proxy address */
static int atif_proxy_probe_device(struct atalk_iface *atif,
struct atalk_addr *proxy_addr)
{
int netrange = ntohs(atif->nets.nr_lastnet) -
ntohs(atif->nets.nr_firstnet) + 1;
/* we probe the interface's network */
int probe_net = ntohs(atif->address.s_net);
int probe_node = ATADDR_ANYNODE; /* we'll take anything */
int netct, nodect;
/* Offset the network we start probing with */
if (probe_net == ATADDR_ANYNET) {
probe_net = ntohs(atif->nets.nr_firstnet);
if (netrange)
probe_net += jiffies % netrange;
}
if (probe_node == ATADDR_ANYNODE)
probe_node = jiffies & 0xFF;
/* Scan the networks */
for (netct = 0; netct <= netrange; netct++) {
/* Sweep the available nodes from a given start */
proxy_addr->s_net = htons(probe_net);
for (nodect = 0; nodect < 256; nodect++) {
proxy_addr->s_node = (nodect + probe_node) & 0xFF;
if (proxy_addr->s_node > 0 &&
proxy_addr->s_node < 254) {
/* Tell AARP to probe a proposed address */
int ret = aarp_proxy_probe_network(atif,
proxy_addr);
if (ret != -EADDRINUSE)
return ret;
}
}
probe_net++;
if (probe_net > ntohs(atif->nets.nr_lastnet))
probe_net = ntohs(atif->nets.nr_firstnet);
}
return -EADDRINUSE; /* Network is full... */
}
struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
{
struct atalk_iface *iface = dev->atalk_ptr;
return iface ? &iface->address : NULL;
}
static struct atalk_addr *atalk_find_primary(void)
{
struct atalk_iface *fiface = NULL;
struct atalk_addr *retval;
struct atalk_iface *iface;
/*
* Return a point-to-point interface only if
* there is no non-ptp interface available.
*/
read_lock_bh(&atalk_interfaces_lock);
for (iface = atalk_interfaces; iface; iface = iface->next) {
if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
fiface = iface;
if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
retval = &iface->address;
goto out;
}
}
if (fiface)
retval = &fiface->address;
else if (atalk_interfaces)
retval = &atalk_interfaces->address;
else
retval = NULL;
out:
read_unlock_bh(&atalk_interfaces_lock);
return retval;
}
/*
* Find a match for 'any network' - ie any of our interfaces with that
* node number will do just nicely.
*/
static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
{
struct atalk_iface *iface = dev->atalk_ptr;
if (!iface || iface->status & ATIF_PROBE)
goto out_err;
if (node != ATADDR_BCAST &&
iface->address.s_node != node &&
node != ATADDR_ANYNODE)
goto out_err;
out:
return iface;
out_err:
iface = NULL;
goto out;
}
/* Find a match for a specific network:node pair */
static struct atalk_iface *atalk_find_interface(__be16 net, int node)
{
struct atalk_iface *iface;
read_lock_bh(&atalk_interfaces_lock);
for (iface = atalk_interfaces; iface; iface = iface->next) {
if ((node == ATADDR_BCAST ||
node == ATADDR_ANYNODE ||
iface->address.s_node == node) &&
iface->address.s_net == net &&
!(iface->status & ATIF_PROBE))
break;
/* XXXX.0 -- net.0 returns the iface associated with net */
if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
ntohs(net) <= ntohs(iface->nets.nr_lastnet))
break;
}
read_unlock_bh(&atalk_interfaces_lock);
return iface;
}
/*
* Find a route for an AppleTalk packet. This ought to get cached in
* the socket (later on...). We know about host routes and the fact
* that a route must be direct to broadcast.
*/
static struct atalk_route *atrtr_find(struct atalk_addr *target)
{
/*
* we must search through all routes unless we find a
* host route, because some host routes might overlap
* network routes
*/
struct atalk_route *net_route = NULL;
struct atalk_route *r;
read_lock_bh(&atalk_routes_lock);
for (r = atalk_routes; r; r = r->next) {
if (!(r->flags & RTF_UP))
continue;
if (r->target.s_net == target->s_net) {
if (r->flags & RTF_HOST) {
/*
* if this host route is for the target,
* the we're done
*/
if (r->target.s_node == target->s_node)
goto out;
} else
/*
* this route will work if there isn't a
* direct host route, so cache it
*/
net_route = r;
}
}
/*
* if we found a network route but not a direct host
* route, then return it
*/
if (net_route)
r = net_route;
else if (atrtr_default.dev)
r = &atrtr_default;
else /* No route can be found */
r = NULL;
out:
read_unlock_bh(&atalk_routes_lock);
return r;
}
/*
* Given an AppleTalk network, find the device to use. This can be
* a simple lookup.
*/
struct net_device *atrtr_get_dev(struct atalk_addr *sa)
{
struct atalk_route *atr = atrtr_find(sa);
return atr ? atr->dev : NULL;
}
/* Set up a default router */
static void atrtr_set_default(struct net_device *dev)
{
atrtr_default.dev = dev;
atrtr_default.flags = RTF_UP;
atrtr_default.gateway.s_net = htons(0);
atrtr_default.gateway.s_node = 0;
}
/*
* Add a router. Basically make sure it looks valid and stuff the
* entry in the list. While it uses netranges we always set them to one
* entry to work like netatalk.
*/
static int atrtr_create(struct rtentry *r, struct net_device *devhint)
{
struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
struct atalk_route *rt;
struct atalk_iface *iface, *riface;
int retval = -EINVAL;
/*
* Fixme: Raise/Lower a routing change semaphore for these
* operations.
*/
/* Validate the request */
if (ta->sat_family != AF_APPLETALK ||
(!devhint && ga->sat_family != AF_APPLETALK))
goto out;
/* Now walk the routing table and make our decisions */
write_lock_bh(&atalk_routes_lock);
for (rt = atalk_routes; rt; rt = rt->next) {
if (r->rt_flags != rt->flags)
continue;
if (ta->sat_addr.s_net == rt->target.s_net) {
if (!(rt->flags & RTF_HOST))
break;
if (ta->sat_addr.s_node == rt->target.s_node)
break;
}
}
if (!devhint) {
riface = NULL;
read_lock_bh(&atalk_interfaces_lock);
for (iface = atalk_interfaces; iface; iface = iface->next) {
if (!riface &&
ntohs(ga->sat_addr.s_net) >=
ntohs(iface->nets.nr_firstnet) &&
ntohs(ga->sat_addr.s_net) <=
ntohs(iface->nets.nr_lastnet))
riface = iface;
if (ga->sat_addr.s_net == iface->address.s_net &&
ga->sat_addr.s_node == iface->address.s_node)
riface = iface;
}
read_unlock_bh(&atalk_interfaces_lock);
retval = -ENETUNREACH;
if (!riface)
goto out_unlock;
devhint = riface->dev;
}
if (!rt) {
rt = kzalloc(sizeof(*rt), GFP_ATOMIC);
retval = -ENOBUFS;
if (!rt)
goto out_unlock;
rt->next = atalk_routes;
atalk_routes = rt;
}
/* Fill in the routing entry */
rt->target = ta->sat_addr;
dev_hold(devhint);
rt->dev = devhint;
rt->flags = r->rt_flags;
rt->gateway = ga->sat_addr;
retval = 0;
out_unlock:
write_unlock_bh(&atalk_routes_lock);
out:
return retval;
}
/* Delete a route. Find it and discard it */
static int atrtr_delete(struct atalk_addr *addr)
{
struct atalk_route **r = &atalk_routes;
int retval = 0;
struct atalk_route *tmp;
write_lock_bh(&atalk_routes_lock);
while ((tmp = *r) != NULL) {
if (tmp->target.s_net == addr->s_net &&
(!(tmp->flags&RTF_GATEWAY) ||
tmp->target.s_node == addr->s_node)) {
*r = tmp->next;
dev_put(tmp->dev);
kfree(tmp);
goto out;
}
r = &tmp->next;
}
retval = -ENOENT;
out:
write_unlock_bh(&atalk_routes_lock);
return retval;
}
/*
* Called when a device is downed. Just throw away any routes
* via it.
*/
static void atrtr_device_down(struct net_device *dev)
{
struct atalk_route **r = &atalk_routes;
struct atalk_route *tmp;
write_lock_bh(&atalk_routes_lock);
while ((tmp = *r) != NULL) {
if (tmp->dev == dev) {
*r = tmp->next;
dev_put(dev);
kfree(tmp);
} else
r = &tmp->next;
}
write_unlock_bh(&atalk_routes_lock);
if (atrtr_default.dev == dev)
atrtr_set_default(NULL);
}
/* Actually down the interface */
static inline void atalk_dev_down(struct net_device *dev)
{
atrtr_device_down(dev); /* Remove all routes for the device */
aarp_device_down(dev); /* Remove AARP entries for the device */
atif_drop_device(dev); /* Remove the device */
}
/*
* A device event has occurred. Watch for devices going down and
* delete our use of them (iface and route).
*/
static int ddp_device_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
if (!net_eq(dev_net(dev), &init_net))
return NOTIFY_DONE;
if (event == NETDEV_DOWN)
/* Discard any use of this */
atalk_dev_down(dev);
return NOTIFY_DONE;
}
/* ioctl calls. Shouldn't even need touching */
/* Device configuration ioctl calls */
static int atif_ioctl(int cmd, void __user *arg)
{
static char aarp_mcast[6] = { 0x09, 0x00, 0x00, 0xFF, 0xFF, 0xFF };
struct ifreq atreq;
struct atalk_netrange *nr;
struct sockaddr_at *sa;
struct net_device *dev;
struct atalk_iface *atif;
int ct;
int limit;
struct rtentry rtdef;
int add_route;
if (copy_from_user(&atreq, arg, sizeof(atreq)))
return -EFAULT;
dev = __dev_get_by_name(&init_net, atreq.ifr_name);
if (!dev)
return -ENODEV;
sa = (struct sockaddr_at *)&atreq.ifr_addr;
atif = atalk_find_dev(dev);
switch (cmd) {
case SIOCSIFADDR:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (sa->sat_family != AF_APPLETALK)
return -EINVAL;
if (dev->type != ARPHRD_ETHER &&
dev->type != ARPHRD_LOOPBACK &&
dev->type != ARPHRD_LOCALTLK &&
dev->type != ARPHRD_PPP)
return -EPROTONOSUPPORT;
nr = (struct atalk_netrange *)&sa->sat_zero[0];
add_route = 1;
/*
* if this is a point-to-point iface, and we already
* have an iface for this AppleTalk address, then we
* should not add a route
*/
if ((dev->flags & IFF_POINTOPOINT) &&
atalk_find_interface(sa->sat_addr.s_net,
sa->sat_addr.s_node)) {
printk(KERN_DEBUG "AppleTalk: point-to-point "
"interface added with "
"existing address\n");
add_route = 0;
}
/*
* Phase 1 is fine on LocalTalk but we don't do
* EtherTalk phase 1. Anyone wanting to add it go ahead.
*/
if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
return -EPROTONOSUPPORT;
if (sa->sat_addr.s_node == ATADDR_BCAST ||
sa->sat_addr.s_node == 254)
return -EINVAL;
if (atif) {
/* Already setting address */
if (atif->status & ATIF_PROBE)
return -EBUSY;
atif->address.s_net = sa->sat_addr.s_net;
atif->address.s_node = sa->sat_addr.s_node;
atrtr_device_down(dev); /* Flush old routes */
} else {
atif = atif_add_device(dev, &sa->sat_addr);
if (!atif)
return -ENOMEM;
}
atif->nets = *nr;
/*
* Check if the chosen address is used. If so we
* error and atalkd will try another.
*/
if (!(dev->flags & IFF_LOOPBACK) &&
!(dev->flags & IFF_POINTOPOINT) &&
atif_probe_device(atif) < 0) {
atif_drop_device(dev);
return -EADDRINUSE;
}
/* Hey it worked - add the direct routes */
sa = (struct sockaddr_at *)&rtdef.rt_gateway;
sa->sat_family = AF_APPLETALK;
sa->sat_addr.s_net = atif->address.s_net;
sa->sat_addr.s_node = atif->address.s_node;
sa = (struct sockaddr_at *)&rtdef.rt_dst;
rtdef.rt_flags = RTF_UP;
sa->sat_family = AF_APPLETALK;
sa->sat_addr.s_node = ATADDR_ANYNODE;
if (dev->flags & IFF_LOOPBACK ||
dev->flags & IFF_POINTOPOINT)
rtdef.rt_flags |= RTF_HOST;
/* Routerless initial state */
if (nr->nr_firstnet == htons(0) &&
nr->nr_lastnet == htons(0xFFFE)) {
sa->sat_addr.s_net = atif->address.s_net;
atrtr_create(&rtdef, dev);
atrtr_set_default(dev);
} else {
limit = ntohs(nr->nr_lastnet);
if (limit - ntohs(nr->nr_firstnet) > 4096) {
printk(KERN_WARNING "Too many routes/"
"iface.\n");
return -EINVAL;
}
if (add_route)
for (ct = ntohs(nr->nr_firstnet);
ct <= limit; ct++) {
sa->sat_addr.s_net = htons(ct);
atrtr_create(&rtdef, dev);
}
}
dev_mc_add_global(dev, aarp_mcast);
return 0;
case SIOCGIFADDR:
if (!atif)
return -EADDRNOTAVAIL;
sa->sat_family = AF_APPLETALK;
sa->sat_addr = atif->address;
break;
case SIOCGIFBRDADDR:
if (!atif)
return -EADDRNOTAVAIL;
sa->sat_family = AF_APPLETALK;
sa->sat_addr.s_net = atif->address.s_net;
sa->sat_addr.s_node = ATADDR_BCAST;
break;
case SIOCATALKDIFADDR:
case SIOCDIFADDR:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (sa->sat_family != AF_APPLETALK)
return -EINVAL;
atalk_dev_down(dev);
break;
case SIOCSARP:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (sa->sat_family != AF_APPLETALK)
return -EINVAL;
/*
* for now, we only support proxy AARP on ELAP;
* we should be able to do it for LocalTalk, too.
*/
if (dev->type != ARPHRD_ETHER)
return -EPROTONOSUPPORT;
/*
* atif points to the current interface on this network;
* we aren't concerned about its current status (at
* least for now), but it has all the settings about
* the network we're going to probe. Consequently, it
* must exist.
*/
if (!atif)
return -EADDRNOTAVAIL;
nr = (struct atalk_netrange *)&(atif->nets);
/*
* Phase 1 is fine on Localtalk but we don't do
* Ethertalk phase 1. Anyone wanting to add it go ahead.
*/
if (dev->type == ARPHRD_ETHER && nr->nr_phase != 2)
return -EPROTONOSUPPORT;
if (sa->sat_addr.s_node == ATADDR_BCAST ||
sa->sat_addr.s_node == 254)
return -EINVAL;
/*
* Check if the chosen address is used. If so we
* error and ATCP will try another.
*/
if (atif_proxy_probe_device(atif, &(sa->sat_addr)) < 0)
return -EADDRINUSE;
/*
* We now have an address on the local network, and
* the AARP code will defend it for us until we take it
* down. We don't set up any routes right now, because
* ATCP will install them manually via SIOCADDRT.
*/
break;
case SIOCDARP:
if (!capable(CAP_NET_ADMIN))
return -EPERM;
if (sa->sat_family != AF_APPLETALK)
return -EINVAL;
if (!atif)
return -EADDRNOTAVAIL;
/* give to aarp module to remove proxy entry */
aarp_proxy_remove(atif->dev, &(sa->sat_addr));
return 0;
}
return copy_to_user(arg, &atreq, sizeof(atreq)) ? -EFAULT : 0;
}
/* Routing ioctl() calls */
static int atrtr_ioctl(unsigned int cmd, void __user *arg)
{
struct rtentry rt;
if (copy_from_user(&rt, arg, sizeof(rt)))
return -EFAULT;
switch (cmd) {
case SIOCDELRT:
if (rt.rt_dst.sa_family != AF_APPLETALK)
return -EINVAL;
return atrtr_delete(&((struct sockaddr_at *)
&rt.rt_dst)->sat_addr);
case SIOCADDRT: {
struct net_device *dev = NULL;
if (rt.rt_dev) {
char name[IFNAMSIZ];
if (copy_from_user(name, rt.rt_dev, IFNAMSIZ-1))
return -EFAULT;
name[IFNAMSIZ-1] = '\0';
dev = __dev_get_by_name(&init_net, name);
if (!dev)
return -ENODEV;
}
return atrtr_create(&rt, dev);
}
}
return -EINVAL;
}
/**************************************************************************\
* *
* Handling for system calls applied via the various interfaces to an *
* AppleTalk socket object. *
* *
\**************************************************************************/
/*
* Checksum: This is 'optional'. It's quite likely also a good
* candidate for assembler hackery 8)
*/
static unsigned long atalk_sum_partial(const unsigned char *data,
int len, unsigned long sum)
{
/* This ought to be unwrapped neatly. I'll trust gcc for now */
while (len--) {
sum += *data++;
sum = rol16(sum, 1);
}
return sum;
}
/* Checksum skb data -- similar to skb_checksum */
static unsigned long atalk_sum_skb(const struct sk_buff *skb, int offset,
int len, unsigned long sum)
{
int start = skb_headlen(skb);
struct sk_buff *frag_iter;
int i, copy;
/* checksum stuff in header space */
if ((copy = start - offset) > 0) {
if (copy > len)
copy = len;
sum = atalk_sum_partial(skb->data + offset, copy, sum);
if ((len -= copy) == 0)
return sum;
offset += copy;
}
/* checksum stuff in frags */
for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
int end;
const skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
WARN_ON(start > offset + len);
end = start + skb_frag_size(frag);
if ((copy = end - offset) > 0) {
u8 *vaddr;
if (copy > len)
copy = len;
vaddr = kmap_atomic(skb_frag_page(frag));
sum = atalk_sum_partial(vaddr + frag->page_offset +
offset - start, copy, sum);
kunmap_atomic(vaddr);
if (!(len -= copy))
return sum;
offset += copy;
}
start = end;
}
skb_walk_frags(skb, frag_iter) {
int end;
WARN_ON(start > offset + len);
end = start + frag_iter->len;
if ((copy = end - offset) > 0) {
if (copy > len)
copy = len;
sum = atalk_sum_skb(frag_iter, offset - start,
copy, sum);
if ((len -= copy) == 0)
return sum;
offset += copy;
}
start = end;
}
BUG_ON(len > 0);
return sum;
}
static __be16 atalk_checksum(const struct sk_buff *skb, int len)
{
unsigned long sum;
/* skip header 4 bytes */
sum = atalk_sum_skb(skb, 4, len-4, 0);
/* Use 0xFFFF for 0. 0 itself means none */
return sum ? htons((unsigned short)sum) : htons(0xFFFF);
}