2 * af_llc.c - LLC User Interface SAPs
4 * Functions in this module are implementation of socket based llc
5 * communications for the Linux operating system. Support of llc class
6 * one and class two is provided via SOCK_DGRAM and SOCK_STREAM
9 * An llc2 connection is (mac + sap), only one llc2 sap connection
10 * is allowed per mac. Though one sap may have multiple mac + sap
13 * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
14 * 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
16 * This program can be redistributed or modified under the terms of the
17 * GNU General Public License as published by the Free Software Foundation.
18 * This program is distributed without any warranty or implied warranty
19 * of merchantability or fitness for a particular purpose.
21 * See the GNU General Public License for more details.
23 #include <linux/config.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/init.h>
29 #include <net/llc_sap.h>
30 #include <net/llc_pdu.h>
31 #include <net/llc_conn.h>
32 #include <net/tcp_states.h>
34 /* remember: uninitialized global data is zeroed because its in .bss */
35 static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
36 static u16 llc_ui_sap_link_no_max[256];
37 static struct sockaddr_llc llc_ui_addrnull;
38 static struct proto_ops llc_ui_ops;
40 static int llc_ui_wait_for_conn(struct sock *sk, int timeout);
41 static int llc_ui_wait_for_disc(struct sock *sk, int timeout);
42 static int llc_ui_wait_for_data(struct sock *sk, int timeout);
43 static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout);
46 #define dprintk(args...) printk(KERN_DEBUG args)
48 #define dprintk(args...)
52 * llc_ui_next_link_no - return the next unused link number for a sap
53 * @sap: Address of sap to get link number from.
55 * Return the next unused link number for a given sap.
57 static __inline__ u16 llc_ui_next_link_no(int sap)
59 return llc_ui_sap_link_no_max[sap]++;
63 * llc_proto_type - return eth protocol for ARP header type
64 * @arphrd: ARP header type.
66 * Given an ARP header type return the corresponding ethernet protocol.
68 static __inline__ u16 llc_proto_type(u16 arphrd)
70 return arphrd == ARPHRD_IEEE802_TR ?
71 htons(ETH_P_TR_802_2) : htons(ETH_P_802_2);
75 * llc_ui_addr_null - determines if a address structure is null
76 * @addr: Address to test if null.
78 static __inline__ u8 llc_ui_addr_null(struct sockaddr_llc *addr)
80 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
84 * llc_ui_header_len - return length of llc header based on operation
85 * @sk: Socket which contains a valid llc socket type.
86 * @addr: Complete sockaddr_llc structure received from the user.
88 * Provide the length of the llc header depending on what kind of
89 * operation the user would like to perform and the type of socket.
90 * Returns the correct llc header length.
92 static __inline__ u8 llc_ui_header_len(struct sock *sk,
93 struct sockaddr_llc *addr)
95 u8 rc = LLC_PDU_LEN_U;
97 if (addr->sllc_test || addr->sllc_xid)
99 else if (sk->sk_type == SOCK_STREAM)
105 * llc_ui_send_data - send data via reliable llc2 connection
106 * @sk: Connection the socket is using.
107 * @skb: Data the user wishes to send.
108 * @addr: Source and destination fields provided by the user.
109 * @noblock: can we block waiting for data?
111 * Send data via reliable llc2 connection.
112 * Returns 0 upon success, non-zero if action did not succeed.
114 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
116 struct llc_sock* llc = llc_sk(sk);
119 if (llc_data_accept_state(llc->state) || llc->p_flag) {
120 int timeout = sock_sndtimeo(sk, noblock);
122 rc = llc_ui_wait_for_busy_core(sk, timeout);
125 rc = llc_build_and_send_pkt(sk, skb);
129 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
131 sk->sk_type = sock->type;
132 sk->sk_sleep = &sock->wait;
133 sk->sk_socket = sock;
135 sock->ops = &llc_ui_ops;
138 static struct proto llc_proto = {
140 .owner = THIS_MODULE,
141 .obj_size = sizeof(struct llc_sock),
145 * llc_ui_create - alloc and init a new llc_ui socket
146 * @sock: Socket to initialize and attach allocated sk to.
149 * Allocate and initialize a new llc_ui socket, validate the user wants a
150 * socket type we have available.
151 * Returns 0 upon success, negative upon failure.
153 static int llc_ui_create(struct socket *sock, int protocol)
156 int rc = -ESOCKTNOSUPPORT;
158 if (sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM) {
160 sk = llc_sk_alloc(PF_LLC, GFP_KERNEL, &llc_proto);
163 llc_ui_sk_init(sock, sk);
170 * llc_ui_release - shutdown socket
171 * @sock: Socket to release.
173 * Shutdown and deallocate an existing socket.
175 static int llc_ui_release(struct socket *sock)
177 struct sock *sk = sock->sk;
178 struct llc_sock *llc;
185 dprintk("%s: closing local(%02X) remote(%02X)\n", __FUNCTION__,
186 llc->laddr.lsap, llc->daddr.lsap);
187 if (!llc_send_disc(sk))
188 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
189 if (!sock_flag(sk, SOCK_ZAPPED))
190 llc_sap_remove_socket(llc->sap, sk);
192 if (llc->sap && hlist_empty(&llc->sap->sk_list.list)) {
193 llc_release_sockets(llc->sap);
194 llc_sap_close(llc->sap);
205 * llc_ui_autoport - provide dynamically allocate SAP number
207 * Provide the caller with a dynamically allocated SAP number according
208 * to the rules that are set in this function. Returns: 0, upon failure,
209 * SAP number otherwise.
211 static int llc_ui_autoport(void)
216 while (tries < LLC_SAP_DYN_TRIES) {
217 for (i = llc_ui_sap_last_autoport;
218 i < LLC_SAP_DYN_STOP; i += 2) {
219 sap = llc_sap_find(i);
221 llc_ui_sap_last_autoport = i + 2;
225 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
234 * llc_ui_autobind - Bind a socket to a specific address.
235 * @sk: Socket to bind an address to.
236 * @addr: Address the user wants the socket bound to.
238 * Bind a socket to a specific address. For llc a user is able to bind to
239 * a specific sap only or mac + sap. If the user only specifies a sap and
240 * a null dmac (all zeros) the user is attempting to bind to an entire
241 * sap. This will stop anyone else on the local system from using that
242 * sap. If someone else has a mac + sap open the bind to null + sap will
244 * If the user desires to bind to a specific mac + sap, it is possible to
245 * have multiple sap connections via multiple macs.
246 * Bind and autobind for that matter must enforce the correct sap usage
247 * otherwise all hell will break loose.
248 * Returns: 0 upon success, negative otherwise.
250 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
252 struct sock *sk = sock->sk;
253 struct llc_sock *llc = llc_sk(sk);
257 if (!sock_flag(sk, SOCK_ZAPPED))
260 llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd);
264 llc->laddr.lsap = llc_ui_autoport();
265 if (!llc->laddr.lsap)
267 rc = -EBUSY; /* some other network layer is using the sap */
268 sap = llc_sap_open(llc->laddr.lsap, NULL);
271 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
272 memcpy(&llc->addr, addr, sizeof(llc->addr));
273 /* assign new connection to its SAP */
274 llc_sap_add_socket(sap, sk);
275 sock_reset_flag(sk, SOCK_ZAPPED);
282 * llc_ui_bind - bind a socket to a specific address.
283 * @sock: Socket to bind an address to.
284 * @uaddr: Address the user wants the socket bound to.
285 * @addrlen: Length of the uaddr structure.
287 * Bind a socket to a specific address. For llc a user is able to bind to
288 * a specific sap only or mac + sap. If the user only specifies a sap and
289 * a null dmac (all zeros) the user is attempting to bind to an entire
290 * sap. This will stop anyone else on the local system from using that
291 * sap. If someone else has a mac + sap open the bind to null + sap will
293 * If the user desires to bind to a specific mac + sap, it is possible to
294 * have multiple sap connections via multiple macs.
295 * Bind and autobind for that matter must enforce the correct sap usage
296 * otherwise all hell will break loose.
297 * Returns: 0 upon success, negative otherwise.
299 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
301 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
302 struct sock *sk = sock->sk;
303 struct llc_sock *llc = llc_sk(sk);
307 dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap);
308 if (!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr))
311 if (addr->sllc_family != AF_LLC)
313 if (!addr->sllc_sap) {
315 addr->sllc_sap = llc_ui_autoport();
319 sap = llc_sap_find(addr->sllc_sap);
321 sap = llc_sap_open(addr->sllc_sap, NULL);
322 rc = -EBUSY; /* some other network layer is using the sap */
326 struct llc_addr laddr, daddr;
329 memset(&laddr, 0, sizeof(laddr));
330 memset(&daddr, 0, sizeof(daddr));
332 * FIXME: check if the the address is multicast,
333 * only SOCK_DGRAM can do this.
335 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
336 laddr.lsap = addr->sllc_sap;
337 rc = -EADDRINUSE; /* mac + sap clash. */
338 ask = llc_lookup_established(sap, &daddr, &laddr);
344 llc->laddr.lsap = addr->sllc_sap;
345 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
346 memcpy(&llc->addr, addr, sizeof(llc->addr));
347 /* assign new connection to its SAP */
348 llc_sap_add_socket(sap, sk);
349 sock_reset_flag(sk, SOCK_ZAPPED);
356 * llc_ui_shutdown - shutdown a connect llc2 socket.
357 * @sock: Socket to shutdown.
358 * @how: What part of the socket to shutdown.
360 * Shutdown a connected llc2 socket. Currently this function only supports
361 * shutting down both sends and receives (2), we could probably make this
362 * function such that a user can shutdown only half the connection but not
364 * Returns: 0 upon success, negative otherwise.
366 static int llc_ui_shutdown(struct socket *sock, int how)
368 struct sock *sk = sock->sk;
372 if (sk->sk_state != TCP_ESTABLISHED)
377 rc = llc_send_disc(sk);
379 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
380 /* Wake up anyone sleeping in poll */
381 sk->sk_state_change(sk);
388 * llc_ui_connect - Connect to a remote llc2 mac + sap.
389 * @sock: Socket which will be connected to the remote destination.
390 * @uaddr: Remote and possibly the local address of the new connection.
391 * @addrlen: Size of uaddr structure.
392 * @flags: Operational flags specified by the user.
394 * Connect to a remote llc2 mac + sap. The caller must specify the
395 * destination mac and address to connect to. If the user hasn't previously
396 * called bind(2) with a smac the address of the first interface of the
397 * specified arp type will be used.
398 * This function will autobind if user did not previously call bind.
399 * Returns: 0 upon success, negative otherwise.
401 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
402 int addrlen, int flags)
404 struct sock *sk = sock->sk;
405 struct llc_sock *llc = llc_sk(sk);
406 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
410 if (addrlen != sizeof(*addr))
413 if (addr->sllc_family != AF_LLC)
415 /* bind connection to sap if user hasn't done it. */
416 if (sock_flag(sk, SOCK_ZAPPED)) {
417 /* bind to sap with null dev, exclusive */
418 rc = llc_ui_autobind(sock, addr);
421 llc->daddr.lsap = addr->sllc_sap;
422 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
424 if (sk->sk_type != SOCK_STREAM)
427 if (sock->state == SS_CONNECTING)
429 sock->state = SS_CONNECTING;
430 sk->sk_state = TCP_SYN_SENT;
431 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
432 rc = llc_establish_connection(sk, llc->dev->dev_addr,
433 addr->sllc_mac, addr->sllc_sap);
435 dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__);
436 sock->state = SS_UNCONNECTED;
437 sk->sk_state = TCP_CLOSE;
440 rc = llc_ui_wait_for_conn(sk, sk->sk_rcvtimeo);
442 dprintk("%s: llc_ui_wait_for_conn failed=%d\n", __FUNCTION__, rc);
449 * llc_ui_listen - allow a normal socket to accept incoming connections
450 * @sock: Socket to allow incoming connections on.
451 * @backlog: Number of connections to queue.
453 * Allow a normal socket to accept incoming connections.
454 * Returns 0 upon success, negative otherwise.
456 static int llc_ui_listen(struct socket *sock, int backlog)
458 struct sock *sk = sock->sk;
462 if (sock->state != SS_UNCONNECTED)
465 if (sk->sk_type != SOCK_STREAM)
468 if (sock_flag(sk, SOCK_ZAPPED))
471 if (!(unsigned)backlog) /* BSDism */
473 sk->sk_max_ack_backlog = backlog;
474 if (sk->sk_state != TCP_LISTEN) {
475 sk->sk_ack_backlog = 0;
476 sk->sk_state = TCP_LISTEN;
478 sk->sk_socket->flags |= __SO_ACCEPTCON;
484 static int llc_ui_wait_for_disc(struct sock *sk, int timeout)
486 DECLARE_WAITQUEUE(wait, current);
489 add_wait_queue_exclusive(sk->sk_sleep, &wait);
491 __set_current_state(TASK_INTERRUPTIBLE);
493 if (sk->sk_state != TCP_CLOSE) {
495 timeout = schedule_timeout(timeout);
500 if (signal_pending(current))
506 __set_current_state(TASK_RUNNING);
507 remove_wait_queue(sk->sk_sleep, &wait);
511 static int llc_ui_wait_for_conn(struct sock *sk, int timeout)
513 DECLARE_WAITQUEUE(wait, current);
516 add_wait_queue_exclusive(sk->sk_sleep, &wait);
518 __set_current_state(TASK_INTERRUPTIBLE);
520 if (sk->sk_state == TCP_CLOSE)
523 if (sk->sk_state != TCP_ESTABLISHED) {
525 timeout = schedule_timeout(timeout);
530 if (signal_pending(current))
536 __set_current_state(TASK_RUNNING);
537 remove_wait_queue(sk->sk_sleep, &wait);
541 static int llc_ui_wait_for_data(struct sock *sk, int timeout)
543 DECLARE_WAITQUEUE(wait, current);
546 add_wait_queue_exclusive(sk->sk_sleep, &wait);
548 __set_current_state(TASK_INTERRUPTIBLE);
549 if (sk->sk_shutdown & RCV_SHUTDOWN)
552 * Well, if we have backlog, try to process it now.
554 if (sk->sk_backlog.tail) {
559 if (skb_queue_empty(&sk->sk_receive_queue)) {
561 timeout = schedule_timeout(timeout);
566 if (signal_pending(current))
572 __set_current_state(TASK_RUNNING);
573 remove_wait_queue(sk->sk_sleep, &wait);
577 static int llc_ui_wait_for_busy_core(struct sock *sk, int timeout)
579 DECLARE_WAITQUEUE(wait, current);
580 struct llc_sock *llc = llc_sk(sk);
583 add_wait_queue_exclusive(sk->sk_sleep, &wait);
585 dprintk("%s: looping...\n", __FUNCTION__);
586 __set_current_state(TASK_INTERRUPTIBLE);
588 if (sk->sk_shutdown & RCV_SHUTDOWN)
591 if (llc_data_accept_state(llc->state) || llc->p_flag) {
593 timeout = schedule_timeout(timeout);
598 if (signal_pending(current))
604 __set_current_state(TASK_RUNNING);
605 remove_wait_queue(sk->sk_sleep, &wait);
610 * llc_ui_accept - accept a new incoming connection.
611 * @sock: Socket which connections arrive on.
612 * @newsock: Socket to move incoming connection to.
613 * @flags: User specified operational flags.
615 * Accept a new incoming connection.
616 * Returns 0 upon success, negative otherwise.
618 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
620 struct sock *sk = sock->sk, *newsk;
621 struct llc_sock *llc, *newllc;
623 int rc = -EOPNOTSUPP;
625 dprintk("%s: accepting on %02X\n", __FUNCTION__,
626 llc_sk(sk)->laddr.lsap);
628 if (sk->sk_type != SOCK_STREAM)
631 if (sock->state != SS_UNCONNECTED || sk->sk_state != TCP_LISTEN)
633 /* wait for a connection to arrive. */
634 rc = llc_ui_wait_for_data(sk, sk->sk_rcvtimeo);
637 dprintk("%s: got a new connection on %02X\n", __FUNCTION__,
638 llc_sk(sk)->laddr.lsap);
639 skb = skb_dequeue(&sk->sk_receive_queue);
645 /* attach connection to a new socket. */
646 llc_ui_sk_init(newsock, newsk);
647 sock_reset_flag(newsk, SOCK_ZAPPED);
648 newsk->sk_state = TCP_ESTABLISHED;
649 newsock->state = SS_CONNECTED;
651 newllc = llc_sk(newsk);
652 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
653 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
655 /* put original socket back into a clean listen state. */
656 sk->sk_state = TCP_LISTEN;
657 sk->sk_ack_backlog--;
659 dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__,
660 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
669 * llc_ui_recvmsg - copy received data to the socket user.
670 * @sock: Socket to copy data from.
671 * @msg: Various user space related information.
672 * @size: Size of user buffer.
673 * @flags: User specified flags.
675 * Copy received data to the socket user.
676 * Returns non-negative upon success, negative otherwise.
678 static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
679 struct msghdr *msg, size_t size, int flags)
681 struct sock *sk = sock->sk;
682 struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
685 int rc = -ENOMEM, timeout;
686 int noblock = flags & MSG_DONTWAIT;
688 dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__,
689 llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
691 timeout = sock_rcvtimeo(sk, noblock);
692 rc = llc_ui_wait_for_data(sk, timeout);
694 dprintk("%s: llc_ui_wait_for_data failed recv "
695 "in %02X from %02X\n", __FUNCTION__,
696 llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
699 skb = skb_dequeue(&sk->sk_receive_queue);
700 if (!skb) /* shutdown */
705 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
708 if (skb->len > copied) {
709 skb_pull(skb, copied);
710 skb_queue_head(&sk->sk_receive_queue, skb);
713 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
714 msg->msg_namelen = sizeof(*uaddr);
721 return rc ? : copied;
725 * llc_ui_sendmsg - Transmit data provided by the socket user.
726 * @sock: Socket to transmit data from.
727 * @msg: Various user related information.
728 * @len: Length of data to transmit.
730 * Transmit data provided by the socket user.
731 * Returns non-negative upon success, negative otherwise.
733 static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
734 struct msghdr *msg, size_t len)
736 struct sock *sk = sock->sk;
737 struct llc_sock *llc = llc_sk(sk);
738 struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
739 int flags = msg->msg_flags;
740 int noblock = flags & MSG_DONTWAIT;
743 int rc = -EINVAL, copied = 0, hdrlen;
745 dprintk("%s: sending from %02X to %02X\n", __FUNCTION__,
746 llc->laddr.lsap, llc->daddr.lsap);
749 if (msg->msg_namelen < sizeof(*addr))
752 if (llc_ui_addr_null(&llc->addr))
756 /* must bind connection to sap if user hasn't done it. */
757 if (sock_flag(sk, SOCK_ZAPPED)) {
758 /* bind to sap with null dev, exclusive. */
759 rc = llc_ui_autobind(sock, addr);
763 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
765 if (size > llc->dev->mtu)
766 size = llc->dev->mtu;
767 copied = size - hdrlen;
769 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
775 skb->protocol = llc_proto_type(addr->sllc_arphrd);
776 skb_reserve(skb, hdrlen);
777 rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
780 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
781 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
785 if (addr->sllc_test) {
786 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
790 if (addr->sllc_xid) {
791 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
796 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
798 rc = llc_ui_send_data(sk, skb, noblock);
800 dprintk("%s: llc_ui_send_data failed: %d\n", __FUNCTION__, rc);
806 dprintk("%s: failed sending from %02X to %02X: %d\n",
807 __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc);
809 return rc ? : copied;
813 * llc_ui_getname - return the address info of a socket
814 * @sock: Socket to get address of.
815 * @uaddr: Address structure to return information.
816 * @uaddrlen: Length of address structure.
817 * @peer: Does user want local or remote address information.
819 * Return the address information of a socket.
821 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
822 int *uaddrlen, int peer)
824 struct sockaddr_llc sllc;
825 struct sock *sk = sock->sk;
826 struct llc_sock *llc = llc_sk(sk);
830 if (sock_flag(sk, SOCK_ZAPPED))
832 *uaddrlen = sizeof(sllc);
833 memset(uaddr, 0, *uaddrlen);
836 if (sk->sk_state != TCP_ESTABLISHED)
839 sllc.sllc_arphrd = llc->dev->type;
840 sllc.sllc_sap = llc->daddr.lsap;
841 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
846 sllc.sllc_sap = llc->sap->laddr.lsap;
849 sllc.sllc_arphrd = llc->dev->type;
850 memcpy(&sllc.sllc_mac, &llc->dev->dev_addr,
855 sllc.sllc_family = AF_LLC;
856 memcpy(uaddr, &sllc, sizeof(sllc));
863 * llc_ui_ioctl - io controls for PF_LLC
864 * @sock: Socket to get/set info
866 * @arg: optional argument for cmd
868 * get/set info on llc sockets
870 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
873 return dev_ioctl(cmd, (void __user *)arg);
877 * llc_ui_setsockopt - set various connection specific parameters.
878 * @sock: Socket to set options on.
879 * @level: Socket level user is requesting operations on.
880 * @optname: Operation name.
881 * @optval User provided operation data.
882 * @optlen: Length of optval.
884 * Set various connection specific parameters.
886 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
887 char __user *optval, int optlen)
889 struct sock *sk = sock->sk;
890 struct llc_sock *llc = llc_sk(sk);
891 int rc = -EINVAL, opt;
894 if (level != SOL_LLC || optlen != sizeof(int))
896 rc = get_user(opt, (int __user *)optval);
902 if (opt > LLC_OPT_MAX_RETRY)
907 if (opt > LLC_OPT_MAX_SIZE)
911 case LLC_OPT_ACK_TMR_EXP:
912 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
914 llc->ack_timer.expire = opt;
916 case LLC_OPT_P_TMR_EXP:
917 if (opt > LLC_OPT_MAX_P_TMR_EXP)
919 llc->pf_cycle_timer.expire = opt;
921 case LLC_OPT_REJ_TMR_EXP:
922 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
924 llc->rej_sent_timer.expire = opt;
926 case LLC_OPT_BUSY_TMR_EXP:
927 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
929 llc->busy_state_timer.expire = opt;
932 if (opt > LLC_OPT_MAX_WIN)
937 if (opt > LLC_OPT_MAX_WIN)
952 * llc_ui_getsockopt - get connection specific socket info
953 * @sock: Socket to get information from.
954 * @level: Socket level user is requesting operations on.
955 * @optname: Operation name.
956 * @optval: Variable to return operation data in.
957 * @optlen: Length of optval.
959 * Get connection specific socket information.
961 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
962 char __user *optval, int __user *optlen)
964 struct sock *sk = sock->sk;
965 struct llc_sock *llc = llc_sk(sk);
966 int val = 0, len = 0, rc = -EINVAL;
969 if (level != SOL_LLC)
971 rc = get_user(len, optlen);
975 if (len != sizeof(int))
979 val = llc->n2; break;
981 val = llc->n1; break;
982 case LLC_OPT_ACK_TMR_EXP:
983 val = llc->ack_timer.expire; break;
984 case LLC_OPT_P_TMR_EXP:
985 val = llc->pf_cycle_timer.expire; break;
986 case LLC_OPT_REJ_TMR_EXP:
987 val = llc->rej_sent_timer.expire; break;
988 case LLC_OPT_BUSY_TMR_EXP:
989 val = llc->busy_state_timer.expire; break;
993 val = llc->rw; break;
999 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1006 static struct net_proto_family llc_ui_family_ops = {
1008 .create = llc_ui_create,
1009 .owner = THIS_MODULE,
1012 static struct proto_ops llc_ui_ops = {
1014 .owner = THIS_MODULE,
1015 .release = llc_ui_release,
1016 .bind = llc_ui_bind,
1017 .connect = llc_ui_connect,
1018 .socketpair = sock_no_socketpair,
1019 .accept = llc_ui_accept,
1020 .getname = llc_ui_getname,
1021 .poll = datagram_poll,
1022 .ioctl = llc_ui_ioctl,
1023 .listen = llc_ui_listen,
1024 .shutdown = llc_ui_shutdown,
1025 .setsockopt = llc_ui_setsockopt,
1026 .getsockopt = llc_ui_getsockopt,
1027 .sendmsg = llc_ui_sendmsg,
1028 .recvmsg = llc_ui_recvmsg,
1029 .mmap = sock_no_mmap,
1030 .sendpage = sock_no_sendpage,
1033 extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
1034 extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
1036 static int __init llc2_init(void)
1038 int rc = proto_register(&llc_proto, 0);
1043 llc_build_offset_table();
1045 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1046 rc = llc_proc_init();
1048 goto out_unregister_llc_proto;
1049 sock_register(&llc_ui_family_ops);
1050 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1051 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1054 out_unregister_llc_proto:
1055 proto_unregister(&llc_proto);
1059 static void __exit llc2_exit(void)
1062 llc_remove_pack(LLC_DEST_SAP);
1063 llc_remove_pack(LLC_DEST_CONN);
1064 sock_unregister(PF_LLC);
1066 proto_unregister(&llc_proto);
1069 module_init(llc2_init);
1070 module_exit(llc2_exit);
1072 MODULE_LICENSE("GPL");
1073 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1074 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1075 MODULE_ALIAS_NETPROTO(PF_LLC);