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9ffc93f203
Remove all #inclusions of asm/system.h preparatory to splitting and killing it. Performed with the following command: perl -p -i -e 's!^#\s*include\s*<asm/system[.]h>.*\n!!' `grep -Irl '^#\s*include\s*<asm/system[.]h>' *` Signed-off-by: David Howells <dhowells@redhat.com>
1173 lines
25 KiB
C
1173 lines
25 KiB
C
/*
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* An implementation of the Acorn Econet and AUN protocols.
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* Philip Blundell <philb@gnu.org>
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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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#define pr_fmt(fmt) fmt
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/route.h>
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#include <linux/inet.h>
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#include <linux/etherdevice.h>
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#include <linux/if_arp.h>
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#include <linux/wireless.h>
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#include <linux/skbuff.h>
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#include <linux/udp.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <net/sock.h>
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#include <net/inet_common.h>
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#include <linux/stat.h>
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#include <linux/init.h>
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#include <linux/if_ec.h>
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#include <net/udp.h>
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#include <net/ip.h>
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#include <linux/spinlock.h>
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#include <linux/rcupdate.h>
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#include <linux/bitops.h>
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#include <linux/mutex.h>
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#include <linux/uaccess.h>
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static const struct proto_ops econet_ops;
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static struct hlist_head econet_sklist;
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static DEFINE_SPINLOCK(econet_lock);
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static DEFINE_MUTEX(econet_mutex);
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/* Since there are only 256 possible network numbers (or fewer, depends
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how you count) it makes sense to use a simple lookup table. */
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static struct net_device *net2dev_map[256];
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#define EC_PORT_IP 0xd2
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#ifdef CONFIG_ECONET_AUNUDP
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static DEFINE_SPINLOCK(aun_queue_lock);
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static struct socket *udpsock;
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#define AUN_PORT 0x8000
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struct aunhdr {
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unsigned char code; /* AUN magic protocol byte */
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unsigned char port;
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unsigned char cb;
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unsigned char pad;
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unsigned long handle;
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};
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static unsigned long aun_seq;
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/* Queue of packets waiting to be transmitted. */
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static struct sk_buff_head aun_queue;
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static struct timer_list ab_cleanup_timer;
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#endif /* CONFIG_ECONET_AUNUDP */
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/* Per-packet information */
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struct ec_cb {
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struct sockaddr_ec sec;
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unsigned long cookie; /* Supplied by user. */
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#ifdef CONFIG_ECONET_AUNUDP
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int done;
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unsigned long seq; /* Sequencing */
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unsigned long timeout; /* Timeout */
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unsigned long start; /* jiffies */
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#endif
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#ifdef CONFIG_ECONET_NATIVE
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void (*sent)(struct sk_buff *, int result);
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#endif
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};
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static void econet_remove_socket(struct hlist_head *list, struct sock *sk)
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{
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spin_lock_bh(&econet_lock);
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sk_del_node_init(sk);
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spin_unlock_bh(&econet_lock);
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}
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static void econet_insert_socket(struct hlist_head *list, struct sock *sk)
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{
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spin_lock_bh(&econet_lock);
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sk_add_node(sk, list);
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spin_unlock_bh(&econet_lock);
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}
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/*
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* Pull a packet from our receive queue and hand it to the user.
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* If necessary we block.
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*/
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static int econet_recvmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len, int flags)
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{
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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size_t copied;
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int err;
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msg->msg_namelen = sizeof(struct sockaddr_ec);
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mutex_lock(&econet_mutex);
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/*
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* Call the generic datagram receiver. This handles all sorts
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* of horrible races and re-entrancy so we can forget about it
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* in the protocol layers.
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*
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* Now it will return ENETDOWN, if device have just gone down,
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* but then it will block.
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*/
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skb = skb_recv_datagram(sk, flags, flags & MSG_DONTWAIT, &err);
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/*
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* An error occurred so return it. Because skb_recv_datagram()
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* handles the blocking we don't see and worry about blocking
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* retries.
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*/
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if (skb == NULL)
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goto out;
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/*
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* You lose any data beyond the buffer you gave. If it worries a
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* user program they can ask the device for its MTU anyway.
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*/
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copied = skb->len;
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if (copied > len) {
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copied = len;
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msg->msg_flags |= MSG_TRUNC;
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}
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/* We can't use skb_copy_datagram here */
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err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
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if (err)
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goto out_free;
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sk->sk_stamp = skb->tstamp;
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if (msg->msg_name)
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memcpy(msg->msg_name, skb->cb, msg->msg_namelen);
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/*
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* Free or return the buffer as appropriate. Again this
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* hides all the races and re-entrancy issues from us.
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*/
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err = copied;
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out_free:
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skb_free_datagram(sk, skb);
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out:
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mutex_unlock(&econet_mutex);
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return err;
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}
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/*
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* Bind an Econet socket.
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*/
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static int econet_bind(struct socket *sock, struct sockaddr *uaddr,
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int addr_len)
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{
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struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
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struct sock *sk;
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struct econet_sock *eo;
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/*
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* Check legality
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*/
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if (addr_len < sizeof(struct sockaddr_ec) ||
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sec->sec_family != AF_ECONET)
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return -EINVAL;
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mutex_lock(&econet_mutex);
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sk = sock->sk;
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eo = ec_sk(sk);
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eo->cb = sec->cb;
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eo->port = sec->port;
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eo->station = sec->addr.station;
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eo->net = sec->addr.net;
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mutex_unlock(&econet_mutex);
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return 0;
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}
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#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
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/*
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* Queue a transmit result for the user to be told about.
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*/
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static void tx_result(struct sock *sk, unsigned long cookie, int result)
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{
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struct sk_buff *skb = alloc_skb(0, GFP_ATOMIC);
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struct ec_cb *eb;
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struct sockaddr_ec *sec;
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if (skb == NULL) {
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pr_debug("econet: memory squeeze, transmit result dropped\n");
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return;
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}
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eb = (struct ec_cb *)&skb->cb;
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sec = (struct sockaddr_ec *)&eb->sec;
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memset(sec, 0, sizeof(struct sockaddr_ec));
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sec->cookie = cookie;
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sec->type = ECTYPE_TRANSMIT_STATUS | result;
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sec->sec_family = AF_ECONET;
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if (sock_queue_rcv_skb(sk, skb) < 0)
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kfree_skb(skb);
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}
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#endif
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#ifdef CONFIG_ECONET_NATIVE
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/*
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* Called by the Econet hardware driver when a packet transmit
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* has completed. Tell the user.
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*/
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static void ec_tx_done(struct sk_buff *skb, int result)
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{
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struct ec_cb *eb = (struct ec_cb *)&skb->cb;
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tx_result(skb->sk, eb->cookie, result);
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}
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#endif
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/*
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* Send a packet. We have to work out which device it's going out on
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* and hence whether to use real Econet or the UDP emulation.
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*/
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static int econet_sendmsg(struct kiocb *iocb, struct socket *sock,
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struct msghdr *msg, size_t len)
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{
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struct sockaddr_ec *saddr = (struct sockaddr_ec *)msg->msg_name;
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struct net_device *dev;
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struct ec_addr addr;
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int err;
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unsigned char port, cb;
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#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
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struct sock *sk = sock->sk;
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struct sk_buff *skb;
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struct ec_cb *eb;
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#endif
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#ifdef CONFIG_ECONET_AUNUDP
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struct msghdr udpmsg;
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struct iovec iov[2];
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struct aunhdr ah;
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struct sockaddr_in udpdest;
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__kernel_size_t size;
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mm_segment_t oldfs;
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char *userbuf;
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#endif
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/*
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* Check the flags.
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*/
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if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_CMSG_COMPAT))
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return -EINVAL;
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/*
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* Get and verify the address.
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*/
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mutex_lock(&econet_mutex);
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if (saddr == NULL || msg->msg_namelen < sizeof(struct sockaddr_ec)) {
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mutex_unlock(&econet_mutex);
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return -EINVAL;
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}
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addr.station = saddr->addr.station;
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addr.net = saddr->addr.net;
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port = saddr->port;
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cb = saddr->cb;
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/* Look for a device with the right network number. */
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dev = net2dev_map[addr.net];
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/* If not directly reachable, use some default */
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if (dev == NULL) {
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dev = net2dev_map[0];
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/* No interfaces at all? */
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if (dev == NULL) {
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mutex_unlock(&econet_mutex);
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return -ENETDOWN;
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}
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}
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if (dev->type == ARPHRD_ECONET) {
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/* Real hardware Econet. We're not worthy etc. */
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#ifdef CONFIG_ECONET_NATIVE
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unsigned short proto = 0;
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int hlen, tlen;
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int res;
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if (len + 15 > dev->mtu) {
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mutex_unlock(&econet_mutex);
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return -EMSGSIZE;
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}
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dev_hold(dev);
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hlen = LL_RESERVED_SPACE(dev);
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tlen = dev->needed_tailroom;
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skb = sock_alloc_send_skb(sk, len + hlen + tlen,
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msg->msg_flags & MSG_DONTWAIT, &err);
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if (skb == NULL)
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goto out_unlock;
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skb_reserve(skb, hlen);
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skb_reset_network_header(skb);
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eb = (struct ec_cb *)&skb->cb;
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eb->cookie = saddr->cookie;
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eb->sec = *saddr;
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eb->sent = ec_tx_done;
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err = -EINVAL;
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res = dev_hard_header(skb, dev, ntohs(proto), &addr, NULL, len);
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if (res < 0)
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goto out_free;
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if (res > 0) {
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struct ec_framehdr *fh;
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/* Poke in our control byte and
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port number. Hack, hack. */
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fh = (struct ec_framehdr *)skb->data;
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fh->cb = cb;
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fh->port = port;
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if (sock->type != SOCK_DGRAM) {
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skb_reset_tail_pointer(skb);
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skb->len = 0;
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}
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}
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/* Copy the data. Returns -EFAULT on error */
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err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len);
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skb->protocol = proto;
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skb->dev = dev;
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skb->priority = sk->sk_priority;
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if (err)
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goto out_free;
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err = -ENETDOWN;
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if (!(dev->flags & IFF_UP))
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goto out_free;
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/*
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* Now send it
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*/
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dev_queue_xmit(skb);
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dev_put(dev);
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mutex_unlock(&econet_mutex);
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return len;
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out_free:
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kfree_skb(skb);
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out_unlock:
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if (dev)
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dev_put(dev);
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#else
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err = -EPROTOTYPE;
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#endif
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mutex_unlock(&econet_mutex);
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return err;
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}
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#ifdef CONFIG_ECONET_AUNUDP
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/* AUN virtual Econet. */
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if (udpsock == NULL) {
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mutex_unlock(&econet_mutex);
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return -ENETDOWN; /* No socket - can't send */
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}
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if (len > 32768) {
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err = -E2BIG;
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goto error;
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}
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/* Make up a UDP datagram and hand it off to some higher intellect. */
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memset(&udpdest, 0, sizeof(udpdest));
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udpdest.sin_family = AF_INET;
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udpdest.sin_port = htons(AUN_PORT);
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/* At the moment we use the stupid Acorn scheme of Econet address
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y.x maps to IP a.b.c.x. This should be replaced with something
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more flexible and more aware of subnet masks. */
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{
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struct in_device *idev;
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unsigned long network = 0;
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rcu_read_lock();
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idev = __in_dev_get_rcu(dev);
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if (idev) {
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if (idev->ifa_list)
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network = ntohl(idev->ifa_list->ifa_address) &
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0xffffff00; /* !!! */
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}
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rcu_read_unlock();
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udpdest.sin_addr.s_addr = htonl(network | addr.station);
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}
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memset(&ah, 0, sizeof(ah));
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ah.port = port;
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ah.cb = cb & 0x7f;
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ah.code = 2; /* magic */
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/* tack our header on the front of the iovec */
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size = sizeof(struct aunhdr);
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iov[0].iov_base = (void *)&ah;
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iov[0].iov_len = size;
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userbuf = vmalloc(len);
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if (userbuf == NULL) {
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err = -ENOMEM;
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goto error;
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}
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iov[1].iov_base = userbuf;
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iov[1].iov_len = len;
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err = memcpy_fromiovec(userbuf, msg->msg_iov, len);
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if (err)
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goto error_free_buf;
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/* Get a skbuff (no data, just holds our cb information) */
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skb = sock_alloc_send_skb(sk, 0, msg->msg_flags & MSG_DONTWAIT, &err);
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if (skb == NULL)
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goto error_free_buf;
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eb = (struct ec_cb *)&skb->cb;
|
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eb->cookie = saddr->cookie;
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eb->timeout = 5 * HZ;
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eb->start = jiffies;
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ah.handle = aun_seq;
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eb->seq = (aun_seq++);
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eb->sec = *saddr;
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skb_queue_tail(&aun_queue, skb);
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udpmsg.msg_name = (void *)&udpdest;
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udpmsg.msg_namelen = sizeof(udpdest);
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udpmsg.msg_iov = &iov[0];
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udpmsg.msg_iovlen = 2;
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udpmsg.msg_control = NULL;
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udpmsg.msg_controllen = 0;
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udpmsg.msg_flags = 0;
|
|
|
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oldfs = get_fs();
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set_fs(KERNEL_DS); /* More privs :-) */
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err = sock_sendmsg(udpsock, &udpmsg, size);
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set_fs(oldfs);
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error_free_buf:
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vfree(userbuf);
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error:
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#else
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err = -EPROTOTYPE;
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#endif
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mutex_unlock(&econet_mutex);
|
|
|
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return err;
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}
|
|
|
|
/*
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* Look up the address of a socket.
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|
*/
|
|
|
|
static int econet_getname(struct socket *sock, struct sockaddr *uaddr,
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int *uaddr_len, int peer)
|
|
{
|
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struct sock *sk;
|
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struct econet_sock *eo;
|
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struct sockaddr_ec *sec = (struct sockaddr_ec *)uaddr;
|
|
|
|
if (peer)
|
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return -EOPNOTSUPP;
|
|
|
|
memset(sec, 0, sizeof(*sec));
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mutex_lock(&econet_mutex);
|
|
|
|
sk = sock->sk;
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eo = ec_sk(sk);
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|
|
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sec->sec_family = AF_ECONET;
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sec->port = eo->port;
|
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sec->addr.station = eo->station;
|
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sec->addr.net = eo->net;
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|
|
|
mutex_unlock(&econet_mutex);
|
|
|
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*uaddr_len = sizeof(*sec);
|
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return 0;
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}
|
|
|
|
static void econet_destroy_timer(unsigned long data)
|
|
{
|
|
struct sock *sk = (struct sock *)data;
|
|
|
|
if (!sk_has_allocations(sk)) {
|
|
sk_free(sk);
|
|
return;
|
|
}
|
|
|
|
sk->sk_timer.expires = jiffies + 10 * HZ;
|
|
add_timer(&sk->sk_timer);
|
|
pr_debug("econet: socket destroy delayed\n");
|
|
}
|
|
|
|
/*
|
|
* Close an econet socket.
|
|
*/
|
|
|
|
static int econet_release(struct socket *sock)
|
|
{
|
|
struct sock *sk;
|
|
|
|
mutex_lock(&econet_mutex);
|
|
|
|
sk = sock->sk;
|
|
if (!sk)
|
|
goto out_unlock;
|
|
|
|
econet_remove_socket(&econet_sklist, sk);
|
|
|
|
/*
|
|
* Now the socket is dead. No more input will appear.
|
|
*/
|
|
|
|
sk->sk_state_change(sk); /* It is useless. Just for sanity. */
|
|
|
|
sock_orphan(sk);
|
|
|
|
/* Purge queues */
|
|
|
|
skb_queue_purge(&sk->sk_receive_queue);
|
|
|
|
if (sk_has_allocations(sk)) {
|
|
sk->sk_timer.data = (unsigned long)sk;
|
|
sk->sk_timer.expires = jiffies + HZ;
|
|
sk->sk_timer.function = econet_destroy_timer;
|
|
add_timer(&sk->sk_timer);
|
|
|
|
goto out_unlock;
|
|
}
|
|
|
|
sk_free(sk);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&econet_mutex);
|
|
return 0;
|
|
}
|
|
|
|
static struct proto econet_proto = {
|
|
.name = "ECONET",
|
|
.owner = THIS_MODULE,
|
|
.obj_size = sizeof(struct econet_sock),
|
|
};
|
|
|
|
/*
|
|
* Create an Econet socket
|
|
*/
|
|
|
|
static int econet_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
struct econet_sock *eo;
|
|
int err;
|
|
|
|
if (!net_eq(net, &init_net))
|
|
return -EAFNOSUPPORT;
|
|
|
|
/* Econet only provides datagram services. */
|
|
if (sock->type != SOCK_DGRAM)
|
|
return -ESOCKTNOSUPPORT;
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
err = -ENOBUFS;
|
|
sk = sk_alloc(net, PF_ECONET, GFP_KERNEL, &econet_proto);
|
|
if (sk == NULL)
|
|
goto out;
|
|
|
|
sk->sk_reuse = 1;
|
|
sock->ops = &econet_ops;
|
|
sock_init_data(sock, sk);
|
|
|
|
eo = ec_sk(sk);
|
|
sock_reset_flag(sk, SOCK_ZAPPED);
|
|
sk->sk_family = PF_ECONET;
|
|
eo->num = protocol;
|
|
|
|
econet_insert_socket(&econet_sklist, sk);
|
|
return 0;
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Handle Econet specific ioctls
|
|
*/
|
|
|
|
static int ec_dev_ioctl(struct socket *sock, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct ifreq ifr;
|
|
struct ec_device *edev;
|
|
struct net_device *dev;
|
|
struct sockaddr_ec *sec;
|
|
int err;
|
|
|
|
/*
|
|
* Fetch the caller's info block into kernel space
|
|
*/
|
|
|
|
if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
|
|
dev = dev_get_by_name(&init_net, ifr.ifr_name);
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
sec = (struct sockaddr_ec *)&ifr.ifr_addr;
|
|
|
|
mutex_lock(&econet_mutex);
|
|
|
|
err = 0;
|
|
switch (cmd) {
|
|
case SIOCSIFADDR:
|
|
if (!capable(CAP_NET_ADMIN)) {
|
|
err = -EPERM;
|
|
break;
|
|
}
|
|
|
|
edev = dev->ec_ptr;
|
|
if (edev == NULL) {
|
|
/* Magic up a new one. */
|
|
edev = kzalloc(sizeof(struct ec_device), GFP_KERNEL);
|
|
if (edev == NULL) {
|
|
err = -ENOMEM;
|
|
break;
|
|
}
|
|
dev->ec_ptr = edev;
|
|
} else
|
|
net2dev_map[edev->net] = NULL;
|
|
edev->station = sec->addr.station;
|
|
edev->net = sec->addr.net;
|
|
net2dev_map[sec->addr.net] = dev;
|
|
if (!net2dev_map[0])
|
|
net2dev_map[0] = dev;
|
|
break;
|
|
|
|
case SIOCGIFADDR:
|
|
edev = dev->ec_ptr;
|
|
if (edev == NULL) {
|
|
err = -ENODEV;
|
|
break;
|
|
}
|
|
memset(sec, 0, sizeof(struct sockaddr_ec));
|
|
sec->addr.station = edev->station;
|
|
sec->addr.net = edev->net;
|
|
sec->sec_family = AF_ECONET;
|
|
dev_put(dev);
|
|
if (copy_to_user(arg, &ifr, sizeof(struct ifreq)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
mutex_unlock(&econet_mutex);
|
|
|
|
dev_put(dev);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Handle generic ioctls
|
|
*/
|
|
|
|
static int econet_ioctl(struct socket *sock, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
void __user *argp = (void __user *)arg;
|
|
|
|
switch (cmd) {
|
|
case SIOCGSTAMP:
|
|
return sock_get_timestamp(sk, argp);
|
|
|
|
case SIOCGSTAMPNS:
|
|
return sock_get_timestampns(sk, argp);
|
|
|
|
case SIOCSIFADDR:
|
|
case SIOCGIFADDR:
|
|
return ec_dev_ioctl(sock, cmd, argp);
|
|
|
|
}
|
|
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
static const struct net_proto_family econet_family_ops = {
|
|
.family = PF_ECONET,
|
|
.create = econet_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static const struct proto_ops econet_ops = {
|
|
.family = PF_ECONET,
|
|
.owner = THIS_MODULE,
|
|
.release = econet_release,
|
|
.bind = econet_bind,
|
|
.connect = sock_no_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = econet_getname,
|
|
.poll = datagram_poll,
|
|
.ioctl = econet_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = sock_no_shutdown,
|
|
.setsockopt = sock_no_setsockopt,
|
|
.getsockopt = sock_no_getsockopt,
|
|
.sendmsg = econet_sendmsg,
|
|
.recvmsg = econet_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
};
|
|
|
|
#if defined(CONFIG_ECONET_AUNUDP) || defined(CONFIG_ECONET_NATIVE)
|
|
/*
|
|
* Find the listening socket, if any, for the given data.
|
|
*/
|
|
|
|
static struct sock *ec_listening_socket(unsigned char port, unsigned char
|
|
station, unsigned char net)
|
|
{
|
|
struct sock *sk;
|
|
struct hlist_node *node;
|
|
|
|
spin_lock(&econet_lock);
|
|
sk_for_each(sk, node, &econet_sklist) {
|
|
struct econet_sock *opt = ec_sk(sk);
|
|
if ((opt->port == port || opt->port == 0) &&
|
|
(opt->station == station || opt->station == 0) &&
|
|
(opt->net == net || opt->net == 0)) {
|
|
sock_hold(sk);
|
|
goto found;
|
|
}
|
|
}
|
|
sk = NULL;
|
|
found:
|
|
spin_unlock(&econet_lock);
|
|
return sk;
|
|
}
|
|
|
|
/*
|
|
* Queue a received packet for a socket.
|
|
*/
|
|
|
|
static int ec_queue_packet(struct sock *sk, struct sk_buff *skb,
|
|
unsigned char stn, unsigned char net,
|
|
unsigned char cb, unsigned char port)
|
|
{
|
|
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
|
|
struct sockaddr_ec *sec = (struct sockaddr_ec *)&eb->sec;
|
|
|
|
memset(sec, 0, sizeof(struct sockaddr_ec));
|
|
sec->sec_family = AF_ECONET;
|
|
sec->type = ECTYPE_PACKET_RECEIVED;
|
|
sec->port = port;
|
|
sec->cb = cb;
|
|
sec->addr.net = net;
|
|
sec->addr.station = stn;
|
|
|
|
return sock_queue_rcv_skb(sk, skb);
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ECONET_AUNUDP
|
|
/*
|
|
* Send an AUN protocol response.
|
|
*/
|
|
|
|
static void aun_send_response(__u32 addr, unsigned long seq, int code, int cb)
|
|
{
|
|
struct sockaddr_in sin = {
|
|
.sin_family = AF_INET,
|
|
.sin_port = htons(AUN_PORT),
|
|
.sin_addr = {.s_addr = addr}
|
|
};
|
|
struct aunhdr ah = {.code = code, .cb = cb, .handle = seq};
|
|
struct kvec iov = {.iov_base = (void *)&ah, .iov_len = sizeof(ah)};
|
|
struct msghdr udpmsg;
|
|
|
|
udpmsg.msg_name = (void *)&sin;
|
|
udpmsg.msg_namelen = sizeof(sin);
|
|
udpmsg.msg_control = NULL;
|
|
udpmsg.msg_controllen = 0;
|
|
udpmsg.msg_flags = 0;
|
|
|
|
kernel_sendmsg(udpsock, &udpmsg, &iov, 1, sizeof(ah));
|
|
}
|
|
|
|
|
|
/*
|
|
* Handle incoming AUN packets. Work out if anybody wants them,
|
|
* and send positive or negative acknowledgements as appropriate.
|
|
*/
|
|
|
|
static void aun_incoming(struct sk_buff *skb, struct aunhdr *ah, size_t len)
|
|
{
|
|
struct iphdr *ip = ip_hdr(skb);
|
|
unsigned char stn = ntohl(ip->saddr) & 0xff;
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
struct ec_device *edev = NULL;
|
|
struct sock *sk = NULL;
|
|
struct sk_buff *newskb;
|
|
|
|
if (dst)
|
|
edev = dst->dev->ec_ptr;
|
|
|
|
if (!edev)
|
|
goto bad;
|
|
|
|
sk = ec_listening_socket(ah->port, stn, edev->net);
|
|
if (sk == NULL)
|
|
goto bad; /* Nobody wants it */
|
|
|
|
newskb = alloc_skb((len - sizeof(struct aunhdr) + 15) & ~15,
|
|
GFP_ATOMIC);
|
|
if (newskb == NULL) {
|
|
pr_debug("AUN: memory squeeze, dropping packet\n");
|
|
/* Send nack and hope sender tries again */
|
|
goto bad;
|
|
}
|
|
|
|
memcpy(skb_put(newskb, len - sizeof(struct aunhdr)), (void *)(ah + 1),
|
|
len - sizeof(struct aunhdr));
|
|
|
|
if (ec_queue_packet(sk, newskb, stn, edev->net, ah->cb, ah->port)) {
|
|
/* Socket is bankrupt. */
|
|
kfree_skb(newskb);
|
|
goto bad;
|
|
}
|
|
|
|
aun_send_response(ip->saddr, ah->handle, 3, 0);
|
|
sock_put(sk);
|
|
return;
|
|
|
|
bad:
|
|
aun_send_response(ip->saddr, ah->handle, 4, 0);
|
|
if (sk)
|
|
sock_put(sk);
|
|
}
|
|
|
|
/*
|
|
* Handle incoming AUN transmit acknowledgements. If the sequence
|
|
* number matches something in our backlog then kill it and tell
|
|
* the user. If the remote took too long to reply then we may have
|
|
* dropped the packet already.
|
|
*/
|
|
|
|
static void aun_tx_ack(unsigned long seq, int result)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned long flags;
|
|
struct ec_cb *eb;
|
|
|
|
spin_lock_irqsave(&aun_queue_lock, flags);
|
|
skb_queue_walk(&aun_queue, skb) {
|
|
eb = (struct ec_cb *)&skb->cb;
|
|
if (eb->seq == seq)
|
|
goto foundit;
|
|
}
|
|
spin_unlock_irqrestore(&aun_queue_lock, flags);
|
|
pr_debug("AUN: unknown sequence %ld\n", seq);
|
|
return;
|
|
|
|
foundit:
|
|
tx_result(skb->sk, eb->cookie, result);
|
|
skb_unlink(skb, &aun_queue);
|
|
spin_unlock_irqrestore(&aun_queue_lock, flags);
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/*
|
|
* Deal with received AUN frames - sort out what type of thing it is
|
|
* and hand it to the right function.
|
|
*/
|
|
|
|
static void aun_data_available(struct sock *sk, int slen)
|
|
{
|
|
int err;
|
|
struct sk_buff *skb;
|
|
unsigned char *data;
|
|
struct aunhdr *ah;
|
|
size_t len;
|
|
|
|
while ((skb = skb_recv_datagram(sk, 0, 1, &err)) == NULL) {
|
|
if (err == -EAGAIN) {
|
|
pr_err("AUN: no data available?!\n");
|
|
return;
|
|
}
|
|
pr_debug("AUN: recvfrom() error %d\n", -err);
|
|
}
|
|
|
|
data = skb_transport_header(skb) + sizeof(struct udphdr);
|
|
ah = (struct aunhdr *)data;
|
|
len = skb->len - sizeof(struct udphdr);
|
|
|
|
switch (ah->code) {
|
|
case 2:
|
|
aun_incoming(skb, ah, len);
|
|
break;
|
|
case 3:
|
|
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_OK);
|
|
break;
|
|
case 4:
|
|
aun_tx_ack(ah->handle, ECTYPE_TRANSMIT_NOT_LISTENING);
|
|
break;
|
|
default:
|
|
pr_debug("AUN: unknown packet type: %d\n", data[0]);
|
|
}
|
|
|
|
skb_free_datagram(sk, skb);
|
|
}
|
|
|
|
/*
|
|
* Called by the timer to manage the AUN transmit queue. If a packet
|
|
* was sent to a dead or nonexistent host then we will never get an
|
|
* acknowledgement back. After a few seconds we need to spot this and
|
|
* drop the packet.
|
|
*/
|
|
|
|
static void ab_cleanup(unsigned long h)
|
|
{
|
|
struct sk_buff *skb, *n;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&aun_queue_lock, flags);
|
|
skb_queue_walk_safe(&aun_queue, skb, n) {
|
|
struct ec_cb *eb = (struct ec_cb *)&skb->cb;
|
|
if ((jiffies - eb->start) > eb->timeout) {
|
|
tx_result(skb->sk, eb->cookie,
|
|
ECTYPE_TRANSMIT_NOT_PRESENT);
|
|
skb_unlink(skb, &aun_queue);
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&aun_queue_lock, flags);
|
|
|
|
mod_timer(&ab_cleanup_timer, jiffies + (HZ * 2));
|
|
}
|
|
|
|
static int __init aun_udp_initialise(void)
|
|
{
|
|
int error;
|
|
struct sockaddr_in sin;
|
|
|
|
skb_queue_head_init(&aun_queue);
|
|
setup_timer(&ab_cleanup_timer, ab_cleanup, 0);
|
|
ab_cleanup_timer.expires = jiffies + (HZ * 2);
|
|
add_timer(&ab_cleanup_timer);
|
|
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_port = htons(AUN_PORT);
|
|
|
|
/* We can count ourselves lucky Acorn machines are too dim to
|
|
speak IPv6. :-) */
|
|
error = sock_create_kern(PF_INET, SOCK_DGRAM, 0, &udpsock);
|
|
if (error < 0) {
|
|
pr_err("AUN: socket error %d\n", -error);
|
|
return error;
|
|
}
|
|
|
|
udpsock->sk->sk_reuse = 1;
|
|
udpsock->sk->sk_allocation = GFP_ATOMIC; /* we're going to call it
|
|
from interrupts */
|
|
|
|
error = udpsock->ops->bind(udpsock, (struct sockaddr *)&sin,
|
|
sizeof(sin));
|
|
if (error < 0) {
|
|
pr_err("AUN: bind error %d\n", -error);
|
|
goto release;
|
|
}
|
|
|
|
udpsock->sk->sk_data_ready = aun_data_available;
|
|
|
|
return 0;
|
|
|
|
release:
|
|
sock_release(udpsock);
|
|
udpsock = NULL;
|
|
return error;
|
|
}
|
|
#endif
|
|
|
|
#ifdef CONFIG_ECONET_NATIVE
|
|
|
|
/*
|
|
* Receive an Econet frame from a device.
|
|
*/
|
|
|
|
static int econet_rcv(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt, struct net_device *orig_dev)
|
|
{
|
|
struct ec_framehdr *hdr;
|
|
struct sock *sk = NULL;
|
|
struct ec_device *edev = dev->ec_ptr;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
goto drop;
|
|
|
|
if (skb->pkt_type == PACKET_OTHERHOST)
|
|
goto drop;
|
|
|
|
if (!edev)
|
|
goto drop;
|
|
|
|
skb = skb_share_check(skb, GFP_ATOMIC);
|
|
if (skb == NULL)
|
|
return NET_RX_DROP;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ec_framehdr)))
|
|
goto drop;
|
|
|
|
hdr = (struct ec_framehdr *)skb->data;
|
|
|
|
/* First check for encapsulated IP */
|
|
if (hdr->port == EC_PORT_IP) {
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb_pull(skb, sizeof(struct ec_framehdr));
|
|
netif_rx(skb);
|
|
return NET_RX_SUCCESS;
|
|
}
|
|
|
|
sk = ec_listening_socket(hdr->port, hdr->src_stn, hdr->src_net);
|
|
if (!sk)
|
|
goto drop;
|
|
|
|
if (ec_queue_packet(sk, skb, edev->net, hdr->src_stn, hdr->cb,
|
|
hdr->port))
|
|
goto drop;
|
|
sock_put(sk);
|
|
return NET_RX_SUCCESS;
|
|
|
|
drop:
|
|
if (sk)
|
|
sock_put(sk);
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static struct packet_type econet_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_ECONET),
|
|
.func = econet_rcv,
|
|
};
|
|
|
|
static void econet_hw_initialise(void)
|
|
{
|
|
dev_add_pack(&econet_packet_type);
|
|
}
|
|
|
|
#endif
|
|
|
|
static int econet_notifier(struct notifier_block *this, unsigned long msg,
|
|
void *data)
|
|
{
|
|
struct net_device *dev = data;
|
|
struct ec_device *edev;
|
|
|
|
if (!net_eq(dev_net(dev), &init_net))
|
|
return NOTIFY_DONE;
|
|
|
|
switch (msg) {
|
|
case NETDEV_UNREGISTER:
|
|
/* A device has gone down - kill any data we hold for it. */
|
|
edev = dev->ec_ptr;
|
|
if (edev) {
|
|
if (net2dev_map[0] == dev)
|
|
net2dev_map[0] = NULL;
|
|
net2dev_map[edev->net] = NULL;
|
|
kfree(edev);
|
|
dev->ec_ptr = NULL;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block econet_netdev_notifier = {
|
|
.notifier_call = econet_notifier,
|
|
};
|
|
|
|
static void __exit econet_proto_exit(void)
|
|
{
|
|
#ifdef CONFIG_ECONET_AUNUDP
|
|
del_timer(&ab_cleanup_timer);
|
|
if (udpsock)
|
|
sock_release(udpsock);
|
|
#endif
|
|
unregister_netdevice_notifier(&econet_netdev_notifier);
|
|
#ifdef CONFIG_ECONET_NATIVE
|
|
dev_remove_pack(&econet_packet_type);
|
|
#endif
|
|
sock_unregister(econet_family_ops.family);
|
|
proto_unregister(&econet_proto);
|
|
}
|
|
|
|
static int __init econet_proto_init(void)
|
|
{
|
|
int err = proto_register(&econet_proto, 0);
|
|
|
|
if (err != 0)
|
|
goto out;
|
|
sock_register(&econet_family_ops);
|
|
#ifdef CONFIG_ECONET_AUNUDP
|
|
aun_udp_initialise();
|
|
#endif
|
|
#ifdef CONFIG_ECONET_NATIVE
|
|
econet_hw_initialise();
|
|
#endif
|
|
register_netdevice_notifier(&econet_netdev_notifier);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
module_init(econet_proto_init);
|
|
module_exit(econet_proto_exit);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NETPROTO(PF_ECONET);
|