![Christoph Hellwig](/assets/img/avatar_default.png)
Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1964 lines
48 KiB
C
1964 lines
48 KiB
C
/*
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* DDP: An implementation of the AppleTalk DDP protocol for
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* Ethernet 'ELAP'.
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*
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* Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* With more than a little assistance from
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*
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* Wesley Craig <netatalk@umich.edu>
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*
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* Fixes:
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* Neil Horman : Added missing device ioctls
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* Michael Callahan : Made routing work
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* Wesley Craig : Fix probing to listen to a
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* passed node id.
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* Alan Cox : Added send/recvmsg support
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* Alan Cox : Moved at. to protinfo in
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* socket.
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* Alan Cox : Added firewall hooks.
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* Alan Cox : Supports new ARPHRD_LOOPBACK
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* Christer Weinigel : Routing and /proc fixes.
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* Bradford Johnson : LocalTalk.
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* Tom Dyas : Module support.
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* Alan Cox : Hooks for PPP (based on the
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* LocalTalk hook).
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* Alan Cox : Posix bits
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* Alan Cox/Mike Freeman : Possible fix to NBP problems
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* Bradford Johnson : IP-over-DDP (experimental)
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* Jay Schulist : Moved IP-over-DDP to its own
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* driver file. (ipddp.c & ipddp.h)
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* Jay Schulist : Made work as module with
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* AppleTalk drivers, cleaned it.
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* Rob Newberry : Added proxy AARP and AARP
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* procfs, moved probing to AARP
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* module.
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* Adrian Sun/
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* Michael Zuelsdorff : fix for net.0 packets. don't
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* allow illegal ether/tokentalk
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* port assignment. we lose a
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* valid localtalk port as a
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* result.
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* Arnaldo C. de Melo : Cleanup, in preparation for
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* shared skb support 8)
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* Arnaldo C. de Melo : Move proc stuff to atalk_proc.c,
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* use seq_file
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/if_arp.h>
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#include <linux/termios.h> /* For TIOCOUTQ/INQ */
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#include <linux/compat.h>
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#include <linux/slab.h>
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#include <net/datalink.h>
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#include <net/psnap.h>
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#include <net/sock.h>
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#include <net/tcp_states.h>
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#include <net/route.h>
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#include <linux/atalk.h>
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#include <linux/highmem.h>
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struct datalink_proto *ddp_dl, *aarp_dl;
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static const struct proto_ops atalk_dgram_ops;
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/**************************************************************************\
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* *
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* Handlers for the socket list. *
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* *
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\**************************************************************************/
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HLIST_HEAD(atalk_sockets);
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DEFINE_RWLOCK(atalk_sockets_lock);
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static inline void __atalk_insert_socket(struct sock *sk)
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{
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sk_add_node(sk, &atalk_sockets);
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}
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static inline void atalk_remove_socket(struct sock *sk)
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{
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write_lock_bh(&atalk_sockets_lock);
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sk_del_node_init(sk);
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write_unlock_bh(&atalk_sockets_lock);
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}
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static struct sock *atalk_search_socket(struct sockaddr_at *to,
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struct atalk_iface *atif)
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{
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struct sock *s;
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read_lock_bh(&atalk_sockets_lock);
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sk_for_each(s, &atalk_sockets) {
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struct atalk_sock *at = at_sk(s);
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if (to->sat_port != at->src_port)
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continue;
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if (to->sat_addr.s_net == ATADDR_ANYNET &&
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to->sat_addr.s_node == ATADDR_BCAST)
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goto found;
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if (to->sat_addr.s_net == at->src_net &&
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(to->sat_addr.s_node == at->src_node ||
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to->sat_addr.s_node == ATADDR_BCAST ||
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to->sat_addr.s_node == ATADDR_ANYNODE))
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goto found;
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/* XXXX.0 -- we got a request for this router. make sure
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* that the node is appropriately set. */
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if (to->sat_addr.s_node == ATADDR_ANYNODE &&
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to->sat_addr.s_net != ATADDR_ANYNET &&
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atif->address.s_node == at->src_node) {
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to->sat_addr.s_node = atif->address.s_node;
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goto found;
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}
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}
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s = NULL;
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found:
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read_unlock_bh(&atalk_sockets_lock);
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return s;
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}
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/**
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* atalk_find_or_insert_socket - Try to find a socket matching ADDR
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* @sk: socket to insert in the list if it is not there already
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* @sat: address to search for
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*
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* Try to find a socket matching ADDR in the socket list, if found then return
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* it. If not, insert SK into the socket list.
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*
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* This entire operation must execute atomically.
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*/
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static struct sock *atalk_find_or_insert_socket(struct sock *sk,
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struct sockaddr_at *sat)
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{
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struct sock *s;
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struct atalk_sock *at;
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write_lock_bh(&atalk_sockets_lock);
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sk_for_each(s, &atalk_sockets) {
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at = at_sk(s);
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if (at->src_net == sat->sat_addr.s_net &&
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at->src_node == sat->sat_addr.s_node &&
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at->src_port == sat->sat_port)
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goto found;
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}
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s = NULL;
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__atalk_insert_socket(sk); /* Wheee, it's free, assign and insert. */
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found:
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write_unlock_bh(&atalk_sockets_lock);
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return s;
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}
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static void atalk_destroy_timer(struct timer_list *t)
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{
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struct sock *sk = from_timer(sk, t, sk_timer);
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if (sk_has_allocations(sk)) {
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sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
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add_timer(&sk->sk_timer);
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} else
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sock_put(sk);
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}
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static inline void atalk_destroy_socket(struct sock *sk)
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{
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atalk_remove_socket(sk);
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skb_queue_purge(&sk->sk_receive_queue);
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if (sk_has_allocations(sk)) {
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timer_setup(&sk->sk_timer, atalk_destroy_timer, 0);
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sk->sk_timer.expires = jiffies + SOCK_DESTROY_TIME;
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add_timer(&sk->sk_timer);
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} else
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sock_put(sk);
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}
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/**************************************************************************\
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* *
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* Routing tables for the AppleTalk socket layer. *
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* *
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\**************************************************************************/
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/* Anti-deadlock ordering is atalk_routes_lock --> iface_lock -DaveM */
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struct atalk_route *atalk_routes;
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DEFINE_RWLOCK(atalk_routes_lock);
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struct atalk_iface *atalk_interfaces;
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DEFINE_RWLOCK(atalk_interfaces_lock);
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/* For probing devices or in a routerless network */
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struct atalk_route atrtr_default;
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/* AppleTalk interface control */
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/*
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* Drop a device. Doesn't drop any of its routes - that is the caller's
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* problem. Called when we down the interface or delete the address.
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*/
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static void atif_drop_device(struct net_device *dev)
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{
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struct atalk_iface **iface = &atalk_interfaces;
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struct atalk_iface *tmp;
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write_lock_bh(&atalk_interfaces_lock);
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while ((tmp = *iface) != NULL) {
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if (tmp->dev == dev) {
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*iface = tmp->next;
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dev_put(dev);
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kfree(tmp);
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dev->atalk_ptr = NULL;
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} else
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iface = &tmp->next;
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}
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write_unlock_bh(&atalk_interfaces_lock);
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}
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static struct atalk_iface *atif_add_device(struct net_device *dev,
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struct atalk_addr *sa)
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{
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struct atalk_iface *iface = kzalloc(sizeof(*iface), GFP_KERNEL);
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if (!iface)
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goto out;
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dev_hold(dev);
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iface->dev = dev;
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dev->atalk_ptr = iface;
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iface->address = *sa;
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iface->status = 0;
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write_lock_bh(&atalk_interfaces_lock);
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iface->next = atalk_interfaces;
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atalk_interfaces = iface;
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write_unlock_bh(&atalk_interfaces_lock);
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out:
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return iface;
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}
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/* Perform phase 2 AARP probing on our tentative address */
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static int atif_probe_device(struct atalk_iface *atif)
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{
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int netrange = ntohs(atif->nets.nr_lastnet) -
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ntohs(atif->nets.nr_firstnet) + 1;
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int probe_net = ntohs(atif->address.s_net);
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int probe_node = atif->address.s_node;
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int netct, nodect;
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/* Offset the network we start probing with */
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if (probe_net == ATADDR_ANYNET) {
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probe_net = ntohs(atif->nets.nr_firstnet);
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if (netrange)
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probe_net += jiffies % netrange;
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}
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if (probe_node == ATADDR_ANYNODE)
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probe_node = jiffies & 0xFF;
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/* Scan the networks */
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atif->status |= ATIF_PROBE;
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for (netct = 0; netct <= netrange; netct++) {
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/* Sweep the available nodes from a given start */
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atif->address.s_net = htons(probe_net);
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for (nodect = 0; nodect < 256; nodect++) {
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atif->address.s_node = (nodect + probe_node) & 0xFF;
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if (atif->address.s_node > 0 &&
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atif->address.s_node < 254) {
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/* Probe a proposed address */
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aarp_probe_network(atif);
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if (!(atif->status & ATIF_PROBE_FAIL)) {
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atif->status &= ~ATIF_PROBE;
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return 0;
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}
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}
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atif->status &= ~ATIF_PROBE_FAIL;
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}
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probe_net++;
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if (probe_net > ntohs(atif->nets.nr_lastnet))
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probe_net = ntohs(atif->nets.nr_firstnet);
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}
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atif->status &= ~ATIF_PROBE;
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return -EADDRINUSE; /* Network is full... */
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}
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/* Perform AARP probing for a proxy address */
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static int atif_proxy_probe_device(struct atalk_iface *atif,
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struct atalk_addr *proxy_addr)
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{
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int netrange = ntohs(atif->nets.nr_lastnet) -
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ntohs(atif->nets.nr_firstnet) + 1;
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/* we probe the interface's network */
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int probe_net = ntohs(atif->address.s_net);
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int probe_node = ATADDR_ANYNODE; /* we'll take anything */
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int netct, nodect;
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/* Offset the network we start probing with */
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if (probe_net == ATADDR_ANYNET) {
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probe_net = ntohs(atif->nets.nr_firstnet);
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if (netrange)
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probe_net += jiffies % netrange;
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}
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if (probe_node == ATADDR_ANYNODE)
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probe_node = jiffies & 0xFF;
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/* Scan the networks */
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for (netct = 0; netct <= netrange; netct++) {
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/* Sweep the available nodes from a given start */
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proxy_addr->s_net = htons(probe_net);
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for (nodect = 0; nodect < 256; nodect++) {
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proxy_addr->s_node = (nodect + probe_node) & 0xFF;
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if (proxy_addr->s_node > 0 &&
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proxy_addr->s_node < 254) {
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/* Tell AARP to probe a proposed address */
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int ret = aarp_proxy_probe_network(atif,
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proxy_addr);
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if (ret != -EADDRINUSE)
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return ret;
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}
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}
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probe_net++;
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if (probe_net > ntohs(atif->nets.nr_lastnet))
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probe_net = ntohs(atif->nets.nr_firstnet);
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}
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return -EADDRINUSE; /* Network is full... */
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}
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struct atalk_addr *atalk_find_dev_addr(struct net_device *dev)
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{
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struct atalk_iface *iface = dev->atalk_ptr;
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return iface ? &iface->address : NULL;
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}
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static struct atalk_addr *atalk_find_primary(void)
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{
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struct atalk_iface *fiface = NULL;
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struct atalk_addr *retval;
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struct atalk_iface *iface;
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/*
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* Return a point-to-point interface only if
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* there is no non-ptp interface available.
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*/
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read_lock_bh(&atalk_interfaces_lock);
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for (iface = atalk_interfaces; iface; iface = iface->next) {
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if (!fiface && !(iface->dev->flags & IFF_LOOPBACK))
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fiface = iface;
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if (!(iface->dev->flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) {
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retval = &iface->address;
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goto out;
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}
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}
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if (fiface)
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retval = &fiface->address;
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else if (atalk_interfaces)
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retval = &atalk_interfaces->address;
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else
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retval = NULL;
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out:
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read_unlock_bh(&atalk_interfaces_lock);
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return retval;
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}
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/*
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* Find a match for 'any network' - ie any of our interfaces with that
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* node number will do just nicely.
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*/
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static struct atalk_iface *atalk_find_anynet(int node, struct net_device *dev)
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{
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struct atalk_iface *iface = dev->atalk_ptr;
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if (!iface || iface->status & ATIF_PROBE)
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goto out_err;
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if (node != ATADDR_BCAST &&
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iface->address.s_node != node &&
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node != ATADDR_ANYNODE)
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goto out_err;
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out:
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return iface;
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out_err:
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iface = NULL;
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goto out;
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}
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/* Find a match for a specific network:node pair */
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static struct atalk_iface *atalk_find_interface(__be16 net, int node)
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{
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struct atalk_iface *iface;
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read_lock_bh(&atalk_interfaces_lock);
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for (iface = atalk_interfaces; iface; iface = iface->next) {
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if ((node == ATADDR_BCAST ||
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node == ATADDR_ANYNODE ||
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iface->address.s_node == node) &&
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iface->address.s_net == net &&
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!(iface->status & ATIF_PROBE))
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break;
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/* XXXX.0 -- net.0 returns the iface associated with net */
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if (node == ATADDR_ANYNODE && net != ATADDR_ANYNET &&
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ntohs(iface->nets.nr_firstnet) <= ntohs(net) &&
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ntohs(net) <= ntohs(iface->nets.nr_lastnet))
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break;
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}
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read_unlock_bh(&atalk_interfaces_lock);
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return iface;
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}
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/*
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* Find a route for an AppleTalk packet. This ought to get cached in
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* the socket (later on...). We know about host routes and the fact
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* that a route must be direct to broadcast.
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*/
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static struct atalk_route *atrtr_find(struct atalk_addr *target)
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{
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/*
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* we must search through all routes unless we find a
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* host route, because some host routes might overlap
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* network routes
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*/
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struct atalk_route *net_route = NULL;
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struct atalk_route *r;
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read_lock_bh(&atalk_routes_lock);
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for (r = atalk_routes; r; r = r->next) {
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if (!(r->flags & RTF_UP))
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continue;
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if (r->target.s_net == target->s_net) {
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if (r->flags & RTF_HOST) {
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/*
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* if this host route is for the target,
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* the we're done
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*/
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if (r->target.s_node == target->s_node)
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goto out;
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} else
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/*
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* this route will work if there isn't a
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* direct host route, so cache it
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*/
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net_route = r;
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}
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}
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/*
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* if we found a network route but not a direct host
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* route, then return it
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*/
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if (net_route)
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r = net_route;
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else if (atrtr_default.dev)
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r = &atrtr_default;
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else /* No route can be found */
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r = NULL;
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out:
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read_unlock_bh(&atalk_routes_lock);
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return r;
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}
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/*
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* Given an AppleTalk network, find the device to use. This can be
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* a simple lookup.
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*/
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struct net_device *atrtr_get_dev(struct atalk_addr *sa)
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{
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struct atalk_route *atr = atrtr_find(sa);
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return atr ? atr->dev : NULL;
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}
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/* Set up a default router */
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static void atrtr_set_default(struct net_device *dev)
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{
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atrtr_default.dev = dev;
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atrtr_default.flags = RTF_UP;
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atrtr_default.gateway.s_net = htons(0);
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atrtr_default.gateway.s_node = 0;
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}
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/*
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* Add a router. Basically make sure it looks valid and stuff the
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* entry in the list. While it uses netranges we always set them to one
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* entry to work like netatalk.
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*/
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static int atrtr_create(struct rtentry *r, struct net_device *devhint)
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{
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struct sockaddr_at *ta = (struct sockaddr_at *)&r->rt_dst;
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struct sockaddr_at *ga = (struct sockaddr_at *)&r->rt_gateway;
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struct atalk_route *rt;
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struct atalk_iface *iface, *riface;
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int retval = -EINVAL;
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/*
|
|
* 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);
|
|
}
|
|
|
|
static struct proto ddp_proto = {
|
|
.name = "DDP",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct atalk_sock),
|
|
};
|
|
|
|
/*
|
|
* Create a socket. Initialise the socket, blank the addresses
|
|
* set the state.
|
|
*/
|
|
static int atalk_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
int rc = -ESOCKTNOSUPPORT;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EAFNOSUPPORT;
|
|
|
|
/*
|
|
* We permit SOCK_DGRAM and RAW is an extension. It is trivial to do
|
|
* and gives you the full ELAP frame. Should be handy for CAP 8)
|
|
*/
|
|
if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
|
|
goto out;
|
|
rc = -ENOMEM;
|
|
sk = sk_alloc(net, PF_APPLETALK, GFP_KERNEL, &ddp_proto, kern);
|
|
if (!sk)
|
|
goto out;
|
|
rc = 0;
|
|
sock->ops = &atalk_dgram_ops;
|
|
sock_init_data(sock, sk);
|
|
|
|
/* Checksums on by default */
|
|
sock_set_flag(sk, SOCK_ZAPPED);
|
|
out:
|
|
return rc;
|
|
}
|
|
|
|
/* Free a socket. No work needed */
|
|
static int atalk_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (sk) {
|
|
sock_hold(sk);
|
|
lock_sock(sk);
|
|
|
|
sock_orphan(sk);
|
|
sock->sk = NULL;
|
|
atalk_destroy_socket(sk);
|
|
|
|
release_sock(sk);
|
|
sock_put(sk);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* atalk_pick_and_bind_port - Pick a source port when one is not given
|
|
* @sk: socket to insert into the tables
|
|
* @sat: address to search for
|
|
*
|
|
* Pick a source port when one is not given. If we can find a suitable free
|
|
* one, we insert the socket into the tables using it.
|
|
*
|
|
* This whole operation must be atomic.
|
|
*/
|
|
static int atalk_pick_and_bind_port(struct sock *sk, struct sockaddr_at *sat)
|
|
{
|
|
int retval;
|
|
|
|
write_lock_bh(&atalk_sockets_lock);
|
|
|
|
for (sat->sat_port = ATPORT_RESERVED;
|
|
sat->sat_port < ATPORT_LAST;
|
|
sat->sat_port++) {
|
|
struct sock *s;
|
|
|
|
sk_for_each(s, &atalk_sockets) {
|
|
struct atalk_sock *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 try_next_port;
|
|
}
|
|
|
|
/* Wheee, it's free, assign and insert. */
|
|
__atalk_insert_socket(sk);
|
|
at_sk(sk)->src_port = sat->sat_port;
|
|
retval = 0;
|
|
goto out;
|
|
|
|
try_next_port:;
|
|
}
|
|
|
|
retval = -EBUSY;
|
|
out:
|
|
write_unlock_bh(&atalk_sockets_lock);
|
|
return retval;
|
|
}
|
|
|
|
static int atalk_autobind(struct sock *sk)
|
|
{
|
|
struct atalk_sock *at = at_sk(sk);
|
|
struct sockaddr_at sat;
|
|
struct atalk_addr *ap = atalk_find_primary();
|
|
int n = -EADDRNOTAVAIL;
|
|
|
|
if (!ap || ap->s_net == htons(ATADDR_ANYNET))
|
|
goto out;
|
|
|
|
at->src_net = sat.sat_addr.s_net = ap->s_net;
|
|
at->src_node = sat.sat_addr.s_node = ap->s_node;
|
|
|
|
n = atalk_pick_and_bind_port(sk, &sat);
|
|
if (!n)
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
out:
|
|
return n;
|
|
}
|
|
|
|
/* Set the address 'our end' of the connection */
|
|
static int atalk_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
|
|
{
|
|
struct sockaddr_at *addr = (struct sockaddr_at *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct atalk_sock *at = at_sk(sk);
|
|
int err;
|
|
|
|
if (!sock_flag(sk, SOCK_ZAPPED) ||
|
|
addr_len != sizeof(struct sockaddr_at))
|
|
return -EINVAL;
|
|
|
|
if (addr->sat_family != AF_APPLETALK)
|
|
return -EAFNOSUPPORT;
|
|
|
|
lock_sock(sk);
|
|
if (addr->sat_addr.s_net == htons(ATADDR_ANYNET)) {
|
|
struct atalk_addr *ap = atalk_find_primary();
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
if (!ap)
|
|
goto out;
|
|
|
|
at->src_net = addr->sat_addr.s_net = ap->s_net;
|
|
at->src_node = addr->sat_addr.s_node = ap->s_node;
|
|
} else {
|
|
err = -EADDRNOTAVAIL;
|
|
if (!atalk_find_interface(addr->sat_addr.s_net,
|
|
addr->sat_addr.s_node))
|
|
goto out;
|
|
|
|
at->src_net = addr->sat_addr.s_net;
|
|
at->src_node = addr->sat_addr.s_node;
|
|
}
|
|
|
|
if (addr->sat_port == ATADDR_ANYPORT) {
|
|
err = atalk_pick_and_bind_port(sk, addr);
|
|
|
|
if (err < 0)
|
|
goto out;
|
|
} else {
|
|
at->src_port = addr->sat_port;
|
|
|
|
err = -EADDRINUSE;
|
|
if (atalk_find_or_insert_socket(sk, addr))
|
|
goto out;
|
|
}
|
|
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
err = 0;
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
/* Set the address we talk to */
|
|
static int atalk_connect(struct socket *sock, struct sockaddr *uaddr,
|
|
int addr_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct atalk_sock *at = at_sk(sk);
|
|
struct sockaddr_at *addr;
|
|
int err;
|
|
|
|
sk->sk_state = TCP_CLOSE;
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
if (addr_len != sizeof(*addr))
|
|
return -EINVAL;
|
|
|
|
addr = (struct sockaddr_at *)uaddr;
|
|
|
|
if (addr->sat_family != AF_APPLETALK)
|
|
return -EAFNOSUPPORT;
|
|
|
|
if (addr->sat_addr.s_node == ATADDR_BCAST &&
|
|
!sock_flag(sk, SOCK_BROADCAST)) {
|
|
#if 1
|
|
pr_warn("atalk_connect: %s is broken and did not set SO_BROADCAST.\n",
|
|
current->comm);
|
|
#else
|
|
return -EACCES;
|
|
#endif
|
|
}
|
|
|
|
lock_sock(sk);
|
|
err = -EBUSY;
|
|
if (sock_flag(sk, SOCK_ZAPPED))
|
|
if (atalk_autobind(sk) < 0)
|
|
goto out;
|
|
|
|
err = -ENETUNREACH;
|
|
if (!atrtr_get_dev(&addr->sat_addr))
|
|
goto out;
|
|
|
|
at->dest_port = addr->sat_port;
|
|
at->dest_net = addr->sat_addr.s_net;
|
|
at->dest_node = addr->sat_addr.s_node;
|
|
|
|
sock->state = SS_CONNECTED;
|
|
sk->sk_state = TCP_ESTABLISHED;
|
|
err = 0;
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Find the name of an AppleTalk socket. Just copy the right
|
|
* fields into the sockaddr.
|
|
*/
|
|
static int atalk_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int peer)
|
|
{
|
|
struct sockaddr_at sat;
|
|
struct sock *sk = sock->sk;
|
|
struct atalk_sock *at = at_sk(sk);
|
|
int err;
|
|
|
|
lock_sock(sk);
|
|
err = -ENOBUFS;
|
|
if (sock_flag(sk, SOCK_ZAPPED))
|
|
if (atalk_autobind(sk) < 0)
|
|
goto out;
|
|
|
|
memset(&sat, 0, sizeof(sat));
|
|
|
|
if (peer) {
|
|
err = -ENOTCONN;
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
goto out;
|
|
|
|
sat.sat_addr.s_net = at->dest_net;
|
|
sat.sat_addr.s_node = at->dest_node;
|
|
sat.sat_port = at->dest_port;
|
|
} else {
|
|
sat.sat_addr.s_net = at->src_net;
|
|
sat.sat_addr.s_node = at->src_node;
|
|
sat.sat_port = at->src_port;
|
|
}
|
|
|
|
sat.sat_family = AF_APPLETALK;
|
|
memcpy(uaddr, &sat, sizeof(sat));
|
|
err = sizeof(struct sockaddr_at);
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_IPDDP)
|
|
static __inline__ int is_ip_over_ddp(struct sk_buff *skb)
|
|
{
|
|
return skb->data[12] == 22;
|
|
}
|
|
|
|
static int handle_ip_over_ddp(struct sk_buff *skb)
|
|
{
|
|
struct net_device *dev = __dev_get_by_name(&init_net, "ipddp0");
|
|
struct net_device_stats *stats;
|
|
|
|
/* This needs to be able to handle ipddp"N" devices */
|
|
if (!dev) {
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb_pull(skb, 13);
|
|
skb->dev = dev;
|
|
skb_reset_transport_header(skb);
|
|
|
|
stats = netdev_priv(dev);
|
|
stats->rx_packets++;
|
|
stats->rx_bytes += skb->len + 13;
|
|
return netif_rx(skb); /* Send the SKB up to a higher place. */
|
|
}
|
|
#else
|
|
/* make it easy for gcc to optimize this test out, i.e. kill the code */
|
|
#define is_ip_over_ddp(skb) 0
|
|
#define handle_ip_over_ddp(skb) 0
|
|
#endif
|
|
|
|
static int atalk_route_packet(struct sk_buff *skb, struct net_device *dev,
|
|
struct ddpehdr *ddp, __u16 len_hops, int origlen)
|
|
{
|
|
struct atalk_route *rt;
|
|
struct atalk_addr ta;
|
|
|
|
/*
|
|
* Don't route multicast, etc., packets, or packets sent to "this
|
|
* network"
|
|
*/
|
|
if (skb->pkt_type != PACKET_HOST || !ddp->deh_dnet) {
|
|
/*
|
|
* FIXME:
|
|
*
|
|
* Can it ever happen that a packet is from a PPP iface and
|
|
* needs to be broadcast onto the default network?
|
|
*/
|
|
if (dev->type == ARPHRD_PPP)
|
|
printk(KERN_DEBUG "AppleTalk: didn't forward broadcast "
|
|
"packet received from PPP iface\n");
|
|
goto free_it;
|
|
}
|
|
|
|
ta.s_net = ddp->deh_dnet;
|
|
ta.s_node = ddp->deh_dnode;
|
|
|
|
/* Route the packet */
|
|
rt = atrtr_find(&ta);
|
|
/* increment hops count */
|
|
len_hops += 1 << 10;
|
|
if (!rt || !(len_hops & (15 << 10)))
|
|
goto free_it;
|
|
|
|
/* FIXME: use skb->cb to be able to use shared skbs */
|
|
|
|
/*
|
|
* Route goes through another gateway, so set the target to the
|
|
* gateway instead.
|
|
*/
|
|
|
|
if (rt->flags & RTF_GATEWAY) {
|
|
ta.s_net = rt->gateway.s_net;
|
|
ta.s_node = rt->gateway.s_node;
|
|
}
|
|
|
|
/* Fix up skb->len field */
|
|
skb_trim(skb, min_t(unsigned int, origlen,
|
|
(rt->dev->hard_header_len +
|
|
ddp_dl->header_length + (len_hops & 1023))));
|
|
|
|
/* FIXME: use skb->cb to be able to use shared skbs */
|
|
ddp->deh_len_hops = htons(len_hops);
|
|
|
|
/*
|
|
* Send the buffer onwards
|
|
*
|
|
* Now we must always be careful. If it's come from LocalTalk to
|
|
* EtherTalk it might not fit
|
|
*
|
|
* Order matters here: If a packet has to be copied to make a new
|
|
* headroom (rare hopefully) then it won't need unsharing.
|
|
*
|
|
* Note. ddp-> becomes invalid at the realloc.
|
|
*/
|
|
if (skb_headroom(skb) < 22) {
|
|
/* 22 bytes - 12 ether, 2 len, 3 802.2 5 snap */
|
|
struct sk_buff *nskb = skb_realloc_headroom(skb, 32);
|
|
kfree_skb(skb);
|
|
skb = nskb;
|
|
} else
|
|
skb = skb_unshare(skb, GFP_ATOMIC);
|
|
|
|
/*
|
|
* If the buffer didn't vanish into the lack of space bitbucket we can
|
|
* send it.
|
|
*/
|
|
if (skb == NULL)
|
|
goto drop;
|
|
|
|
if (aarp_send_ddp(rt->dev, skb, &ta, NULL) == NET_XMIT_DROP)
|
|
return NET_RX_DROP;
|
|
return NET_RX_SUCCESS;
|
|
free_it:
|
|
kfree_skb(skb);
|
|
drop:
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
/**
|
|
* atalk_rcv - Receive a packet (in skb) from device dev
|
|
* @skb - packet received
|
|
* @dev - network device where the packet comes from
|
|
* @pt - packet type
|
|
*
|
|
* Receive a packet (in skb) from device dev. This has come from the SNAP
|
|
* decoder, and on entry skb->transport_header is the DDP header, skb->len
|
|
* is the DDP header, skb->len is the DDP length. The physical headers
|
|
* have been extracted. PPP should probably pass frames marked as for this
|
|
* layer. [ie ARPHRD_ETHERTALK]
|
|
*/
|
|
static int atalk_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct ddpehdr *ddp;
|
|
struct sock *sock;
|
|
struct atalk_iface *atif;
|
|
struct sockaddr_at tosat;
|
|
int origlen;
|
|
__u16 len_hops;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
goto drop;
|
|
|
|
/* Don't mangle buffer if shared */
|
|
if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
|
|
goto out;
|
|
|
|
/* Size check and make sure header is contiguous */
|
|
if (!pskb_may_pull(skb, sizeof(*ddp)))
|
|
goto drop;
|
|
|
|
ddp = ddp_hdr(skb);
|
|
|
|
len_hops = ntohs(ddp->deh_len_hops);
|
|
|
|
/* Trim buffer in case of stray trailing data */
|
|
origlen = skb->len;
|
|
skb_trim(skb, min_t(unsigned int, skb->len, len_hops & 1023));
|
|
|
|
/*
|
|
* Size check to see if ddp->deh_len was crap
|
|
* (Otherwise we'll detonate most spectacularly
|
|
* in the middle of atalk_checksum() or recvmsg()).
|
|
*/
|
|
if (skb->len < sizeof(*ddp) || skb->len < (len_hops & 1023)) {
|
|
pr_debug("AppleTalk: dropping corrupted frame (deh_len=%u, "
|
|
"skb->len=%u)\n", len_hops & 1023, skb->len);
|
|
goto drop;
|
|
}
|
|
|
|
/*
|
|
* Any checksums. Note we don't do htons() on this == is assumed to be
|
|
* valid for net byte orders all over the networking code...
|
|
*/
|
|
if (ddp->deh_sum &&
|
|
atalk_checksum(skb, len_hops & 1023) != ddp->deh_sum)
|
|
/* Not a valid AppleTalk frame - dustbin time */
|
|
goto drop;
|
|
|
|
/* Check the packet is aimed at us */
|
|
if (!ddp->deh_dnet) /* Net 0 is 'this network' */
|
|
atif = atalk_find_anynet(ddp->deh_dnode, dev);
|
|
else
|
|
atif = atalk_find_interface(ddp->deh_dnet, ddp->deh_dnode);
|
|
|
|
if (!atif) {
|
|
/* Not ours, so we route the packet via the correct
|
|
* AppleTalk iface
|
|
*/
|
|
return atalk_route_packet(skb, dev, ddp, len_hops, origlen);
|
|
}
|
|
|
|
/* if IP over DDP is not selected this code will be optimized out */
|
|
if (is_ip_over_ddp(skb))
|
|
return handle_ip_over_ddp(skb);
|
|
/*
|
|
* Which socket - atalk_search_socket() looks for a *full match*
|
|
* of the <net, node, port> tuple.
|
|
*/
|
|
tosat.sat_addr.s_net = ddp->deh_dnet;
|
|
tosat.sat_addr.s_node = ddp->deh_dnode;
|
|
tosat.sat_port = ddp->deh_dport;
|
|
|
|
sock = atalk_search_socket(&tosat, atif);
|
|
if (!sock) /* But not one of our sockets */
|
|
goto drop;
|
|
|
|
/* Queue packet (standard) */
|
|
if (sock_queue_rcv_skb(sock, skb) < 0)
|
|
goto drop;
|
|
|
|
return NET_RX_SUCCESS;
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
out:
|
|
return NET_RX_DROP;
|
|
|
|
}
|
|
|
|
/*
|
|
* Receive a LocalTalk frame. We make some demands on the caller here.
|
|
* Caller must provide enough headroom on the packet to pull the short
|
|
* header and append a long one.
|
|
*/
|
|
static int ltalk_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
goto freeit;
|
|
|
|
/* Expand any short form frames */
|
|
if (skb_mac_header(skb)[2] == 1) {
|
|
struct ddpehdr *ddp;
|
|
/* Find our address */
|
|
struct atalk_addr *ap = atalk_find_dev_addr(dev);
|
|
|
|
if (!ap || skb->len < sizeof(__be16) || skb->len > 1023)
|
|
goto freeit;
|
|
|
|
/* Don't mangle buffer if shared */
|
|
if (!(skb = skb_share_check(skb, GFP_ATOMIC)))
|
|
return 0;
|
|
|
|
/*
|
|
* The push leaves us with a ddephdr not an shdr, and
|
|
* handily the port bytes in the right place preset.
|
|
*/
|
|
ddp = skb_push(skb, sizeof(*ddp) - 4);
|
|
|
|
/* Now fill in the long header */
|
|
|
|
/*
|
|
* These two first. The mac overlays the new source/dest
|
|
* network information so we MUST copy these before
|
|
* we write the network numbers !
|
|
*/
|
|
|
|
ddp->deh_dnode = skb_mac_header(skb)[0]; /* From physical header */
|
|
ddp->deh_snode = skb_mac_header(skb)[1]; /* From physical header */
|
|
|
|
ddp->deh_dnet = ap->s_net; /* Network number */
|
|
ddp->deh_snet = ap->s_net;
|
|
ddp->deh_sum = 0; /* No checksum */
|
|
/*
|
|
* Not sure about this bit...
|
|
*/
|
|
/* Non routable, so force a drop if we slip up later */
|
|
ddp->deh_len_hops = htons(skb->len + (DDP_MAXHOPS << 10));
|
|
}
|
|
skb_reset_transport_header(skb);
|
|
|
|
return atalk_rcv(skb, dev, pt, orig_dev);
|
|
freeit:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int atalk_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct atalk_sock *at = at_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_at *, usat, msg->msg_name);
|
|
int flags = msg->msg_flags;
|
|
int loopback = 0;
|
|
struct sockaddr_at local_satalk, gsat;
|
|
struct sk_buff *skb;
|
|
struct net_device *dev;
|
|
struct ddpehdr *ddp;
|
|
int size;
|
|
struct atalk_route *rt;
|
|
int err;
|
|
|
|
if (flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
|
|
return -EINVAL;
|
|
|
|
if (len > DDP_MAXSZ)
|
|
return -EMSGSIZE;
|
|
|
|
lock_sock(sk);
|
|
if (usat) {
|
|
err = -EBUSY;
|
|
if (sock_flag(sk, SOCK_ZAPPED))
|
|
if (atalk_autobind(sk) < 0)
|
|
goto out;
|
|
|
|
err = -EINVAL;
|
|
if (msg->msg_namelen < sizeof(*usat) ||
|
|
usat->sat_family != AF_APPLETALK)
|
|
goto out;
|
|
|
|
err = -EPERM;
|
|
/* netatalk didn't implement this check */
|
|
if (usat->sat_addr.s_node == ATADDR_BCAST &&
|
|
!sock_flag(sk, SOCK_BROADCAST)) {
|
|
goto out;
|
|
}
|
|
} else {
|
|
err = -ENOTCONN;
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
goto out;
|
|
usat = &local_satalk;
|
|
usat->sat_family = AF_APPLETALK;
|
|
usat->sat_port = at->dest_port;
|
|
usat->sat_addr.s_node = at->dest_node;
|
|
usat->sat_addr.s_net = at->dest_net;
|
|
}
|
|
|
|
/* Build a packet */
|
|
SOCK_DEBUG(sk, "SK %p: Got address.\n", sk);
|
|
|
|
/* For headers */
|
|
size = sizeof(struct ddpehdr) + len + ddp_dl->header_length;
|
|
|
|
if (usat->sat_addr.s_net || usat->sat_addr.s_node == ATADDR_ANYNODE) {
|
|
rt = atrtr_find(&usat->sat_addr);
|
|
} else {
|
|
struct atalk_addr at_hint;
|
|
|
|
at_hint.s_node = 0;
|
|
at_hint.s_net = at->src_net;
|
|
|
|
rt = atrtr_find(&at_hint);
|
|
}
|
|
err = -ENETUNREACH;
|
|
if (!rt)
|
|
goto out;
|
|
|
|
dev = rt->dev;
|
|
|
|
SOCK_DEBUG(sk, "SK %p: Size needed %d, device %s\n",
|
|
sk, size, dev->name);
|
|
|
|
size += dev->hard_header_len;
|
|
release_sock(sk);
|
|
skb = sock_alloc_send_skb(sk, size, (flags & MSG_DONTWAIT), &err);
|
|
lock_sock(sk);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
skb_reserve(skb, ddp_dl->header_length);
|
|
skb_reserve(skb, dev->hard_header_len);
|
|
skb->dev = dev;
|
|
|
|
SOCK_DEBUG(sk, "SK %p: Begin build.\n", sk);
|
|
|
|
ddp = skb_put(skb, sizeof(struct ddpehdr));
|
|
ddp->deh_len_hops = htons(len + sizeof(*ddp));
|
|
ddp->deh_dnet = usat->sat_addr.s_net;
|
|
ddp->deh_snet = at->src_net;
|
|
ddp->deh_dnode = usat->sat_addr.s_node;
|
|
ddp->deh_snode = at->src_node;
|
|
ddp->deh_dport = usat->sat_port;
|
|
ddp->deh_sport = at->src_port;
|
|
|
|
SOCK_DEBUG(sk, "SK %p: Copy user data (%zd bytes).\n", sk, len);
|
|
|
|
err = memcpy_from_msg(skb_put(skb, len), msg, len);
|
|
if (err) {
|
|
kfree_skb(skb);
|
|
err = -EFAULT;
|
|
goto out;
|
|
}
|
|
|
|
if (sk->sk_no_check_tx)
|
|
ddp->deh_sum = 0;
|
|
else
|
|
ddp->deh_sum = atalk_checksum(skb, len + sizeof(*ddp));
|
|
|
|
/*
|
|
* Loopback broadcast packets to non gateway targets (ie routes
|
|
* to group we are in)
|
|
*/
|
|
if (ddp->deh_dnode == ATADDR_BCAST &&
|
|
!(rt->flags & RTF_GATEWAY) && !(dev->flags & IFF_LOOPBACK)) {
|
|
struct sk_buff *skb2 = skb_copy(skb, GFP_KERNEL);
|
|
|
|
if (skb2) {
|
|
loopback = 1;
|
|
SOCK_DEBUG(sk, "SK %p: send out(copy).\n", sk);
|
|
/*
|
|
* If it fails it is queued/sent above in the aarp queue
|
|
*/
|
|
aarp_send_ddp(dev, skb2, &usat->sat_addr, NULL);
|
|
}
|
|
}
|
|
|
|
if (dev->flags & IFF_LOOPBACK || loopback) {
|
|
SOCK_DEBUG(sk, "SK %p: Loop back.\n", sk);
|
|
/* loop back */
|
|
skb_orphan(skb);
|
|
if (ddp->deh_dnode == ATADDR_BCAST) {
|
|
struct atalk_addr at_lo;
|
|
|
|
at_lo.s_node = 0;
|
|
at_lo.s_net = 0;
|
|
|
|
rt = atrtr_find(&at_lo);
|
|
if (!rt) {
|
|
kfree_skb(skb);
|
|
err = -ENETUNREACH;
|
|
goto out;
|
|
}
|
|
dev = rt->dev;
|
|
skb->dev = dev;
|
|
}
|
|
ddp_dl->request(ddp_dl, skb, dev->dev_addr);
|
|
} else {
|
|
SOCK_DEBUG(sk, "SK %p: send out.\n", sk);
|
|
if (rt->flags & RTF_GATEWAY) {
|
|
gsat.sat_addr = rt->gateway;
|
|
usat = &gsat;
|
|
}
|
|
|
|
/*
|
|
* If it fails it is queued/sent above in the aarp queue
|
|
*/
|
|
aarp_send_ddp(dev, skb, &usat->sat_addr, NULL);
|
|
}
|
|
SOCK_DEBUG(sk, "SK %p: Done write (%zd).\n", sk, len);
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err ? : len;
|
|
}
|
|
|
|
static int atalk_recvmsg(struct socket *sock, struct msghdr *msg, size_t size,
|
|
int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct ddpehdr *ddp;
|
|
int copied = 0;
|
|
int offset = 0;
|
|
int err = 0;
|
|
struct sk_buff *skb;
|
|
|
|
skb = skb_recv_datagram(sk, flags & ~MSG_DONTWAIT,
|
|
flags & MSG_DONTWAIT, &err);
|
|
lock_sock(sk);
|
|
|
|
if (!skb)
|
|
goto out;
|
|
|
|
/* FIXME: use skb->cb to be able to use shared skbs */
|
|
ddp = ddp_hdr(skb);
|
|
copied = ntohs(ddp->deh_len_hops) & 1023;
|
|
|
|
if (sk->sk_type != SOCK_RAW) {
|
|
offset = sizeof(*ddp);
|
|
copied -= offset;
|
|
}
|
|
|
|
if (copied > size) {
|
|
copied = size;
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
}
|
|
err = skb_copy_datagram_msg(skb, offset, msg, copied);
|
|
|
|
if (!err && msg->msg_name) {
|
|
DECLARE_SOCKADDR(struct sockaddr_at *, sat, msg->msg_name);
|
|
sat->sat_family = AF_APPLETALK;
|
|
sat->sat_port = ddp->deh_sport;
|
|
sat->sat_addr.s_node = ddp->deh_snode;
|
|
sat->sat_addr.s_net = ddp->deh_snet;
|
|
msg->msg_namelen = sizeof(*sat);
|
|
}
|
|
|
|
skb_free_datagram(sk, skb); /* Free the datagram. */
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err ? : copied;
|
|
}
|
|
|
|
|
|
/*
|
|
* AppleTalk ioctl calls.
|
|
*/
|
|
static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
int rc = -ENOIOCTLCMD;
|
|
struct sock *sk = sock->sk;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
/* Protocol layer */
|
|
case TIOCOUTQ: {
|
|
long amount = sk->sk_sndbuf - sk_wmem_alloc_get(sk);
|
|
|
|
if (amount < 0)
|
|
amount = 0;
|
|
rc = put_user(amount, (int __user *)argp);
|
|
break;
|
|
}
|
|
case TIOCINQ: {
|
|
/*
|
|
* These two are safe on a single CPU system as only
|
|
* user tasks fiddle here
|
|
*/
|
|
struct sk_buff *skb = skb_peek(&sk->sk_receive_queue);
|
|
long amount = 0;
|
|
|
|
if (skb)
|
|
amount = skb->len - sizeof(struct ddpehdr);
|
|
rc = put_user(amount, (int __user *)argp);
|
|
break;
|
|
}
|
|
case SIOCGSTAMP:
|
|
rc = sock_get_timestamp(sk, argp);
|
|
break;
|
|
case SIOCGSTAMPNS:
|
|
rc = sock_get_timestampns(sk, argp);
|
|
break;
|
|
/* Routing */
|
|
case SIOCADDRT:
|
|
case SIOCDELRT:
|
|
rc = -EPERM;
|
|
if (capable(CAP_NET_ADMIN))
|
|
rc = atrtr_ioctl(cmd, argp);
|
|
break;
|
|
/* Interface */
|
|
case SIOCGIFADDR:
|
|
case SIOCSIFADDR:
|
|
case SIOCGIFBRDADDR:
|
|
case SIOCATALKDIFADDR:
|
|
case SIOCDIFADDR:
|
|
case SIOCSARP: /* proxy AARP */
|
|
case SIOCDARP: /* proxy AARP */
|
|
rtnl_lock();
|
|
rc = atif_ioctl(cmd, argp);
|
|
rtnl_unlock();
|
|
break;
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
/*
|
|
* SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
|
|
* cannot handle it in common code. The data we access if ifreq
|
|
* here is compatible, so we can simply call the native
|
|
* handler.
|
|
*/
|
|
if (cmd == SIOCATALKDIFADDR)
|
|
return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
#endif
|
|
|
|
|
|
static const struct net_proto_family atalk_family_ops = {
|
|
.family = PF_APPLETALK,
|
|
.create = atalk_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct proto_ops atalk_dgram_ops = {
|
|
.family = PF_APPLETALK,
|
|
.owner = THIS_MODULE,
|
|
.release = atalk_release,
|
|
.bind = atalk_bind,
|
|
.connect = atalk_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = atalk_getname,
|
|
.poll_mask = datagram_poll_mask,
|
|
.ioctl = atalk_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = atalk_compat_ioctl,
|
|
#endif
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = sock_no_setsockopt,
|
|
.getsockopt = sock_no_getsockopt,
|
|
.sendmsg = atalk_sendmsg,
|
|
.recvmsg = atalk_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
static struct notifier_block ddp_notifier = {
|
|
.notifier_call = ddp_device_event,
|
|
};
|
|
|
|
static struct packet_type ltalk_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_LOCALTALK),
|
|
.func = ltalk_rcv,
|
|
};
|
|
|
|
static struct packet_type ppptalk_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_PPPTALK),
|
|
.func = atalk_rcv,
|
|
};
|
|
|
|
static unsigned char ddp_snap_id[] = { 0x08, 0x00, 0x07, 0x80, 0x9B };
|
|
|
|
/* Export symbols for use by drivers when AppleTalk is a module */
|
|
EXPORT_SYMBOL(atrtr_get_dev);
|
|
EXPORT_SYMBOL(atalk_find_dev_addr);
|
|
|
|
static const char atalk_err_snap[] __initconst =
|
|
KERN_CRIT "Unable to register DDP with SNAP.\n";
|
|
|
|
/* Called by proto.c on kernel start up */
|
|
static int __init atalk_init(void)
|
|
{
|
|
int rc = proto_register(&ddp_proto, 0);
|
|
|
|
if (rc != 0)
|
|
goto out;
|
|
|
|
(void)sock_register(&atalk_family_ops);
|
|
ddp_dl = register_snap_client(ddp_snap_id, atalk_rcv);
|
|
if (!ddp_dl)
|
|
printk(atalk_err_snap);
|
|
|
|
dev_add_pack(<alk_packet_type);
|
|
dev_add_pack(&ppptalk_packet_type);
|
|
|
|
register_netdevice_notifier(&ddp_notifier);
|
|
aarp_proto_init();
|
|
atalk_proc_init();
|
|
atalk_register_sysctl();
|
|
out:
|
|
return rc;
|
|
}
|
|
module_init(atalk_init);
|
|
|
|
/*
|
|
* No explicit module reference count manipulation is needed in the
|
|
* protocol. Socket layer sets module reference count for us
|
|
* and interfaces reference counting is done
|
|
* by the network device layer.
|
|
*
|
|
* Ergo, before the AppleTalk module can be removed, all AppleTalk
|
|
* sockets be closed from user space.
|
|
*/
|
|
static void __exit atalk_exit(void)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
atalk_unregister_sysctl();
|
|
#endif /* CONFIG_SYSCTL */
|
|
atalk_proc_exit();
|
|
aarp_cleanup_module(); /* General aarp clean-up. */
|
|
unregister_netdevice_notifier(&ddp_notifier);
|
|
dev_remove_pack(<alk_packet_type);
|
|
dev_remove_pack(&ppptalk_packet_type);
|
|
unregister_snap_client(ddp_dl);
|
|
sock_unregister(PF_APPLETALK);
|
|
proto_unregister(&ddp_proto);
|
|
}
|
|
module_exit(atalk_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Alan Cox <alan@lxorguk.ukuu.org.uk>");
|
|
MODULE_DESCRIPTION("AppleTalk 0.20\n");
|
|
MODULE_ALIAS_NETPROTO(PF_APPLETALK);
|