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, long timeout);
41 static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
42 static int llc_ui_wait_for_data(struct sock *sk, long timeout);
43 static int llc_ui_wait_for_busy_core(struct sock *sk, long 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 long 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 (likely(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;
180 if (unlikely(sk == NULL))
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 - automatically bind a socket to a sap
235 * @sock: socket to bind
236 * @addr: address to connect to
238 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
239 * specifically used llc_ui_bind to bind to an specific address/sap
241 * Returns: 0 upon success, negative otherwise.
243 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
245 struct sock *sk = sock->sk;
246 struct llc_sock *llc = llc_sk(sk);
250 if (!sock_flag(sk, SOCK_ZAPPED))
253 llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd);
257 llc->laddr.lsap = llc_ui_autoport();
258 if (!llc->laddr.lsap)
260 rc = -EBUSY; /* some other network layer is using the sap */
261 sap = llc_sap_open(llc->laddr.lsap, NULL);
264 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
265 memcpy(&llc->addr, addr, sizeof(llc->addr));
266 /* assign new connection to its SAP */
267 llc_sap_add_socket(sap, sk);
268 sock_reset_flag(sk, SOCK_ZAPPED);
275 * llc_ui_bind - bind a socket to a specific address.
276 * @sock: Socket to bind an address to.
277 * @uaddr: Address the user wants the socket bound to.
278 * @addrlen: Length of the uaddr structure.
280 * Bind a socket to a specific address. For llc a user is able to bind to
281 * a specific sap only or mac + sap.
282 * If the user desires to bind to a specific mac + sap, it is possible to
283 * have multiple sap connections via multiple macs.
284 * Bind and autobind for that matter must enforce the correct sap usage
285 * otherwise all hell will break loose.
286 * Returns: 0 upon success, negative otherwise.
288 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
290 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
291 struct sock *sk = sock->sk;
292 struct llc_sock *llc = llc_sk(sk);
296 dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap);
297 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
300 if (unlikely(addr->sllc_family != AF_LLC))
302 if (!addr->sllc_sap) {
304 addr->sllc_sap = llc_ui_autoport();
308 sap = llc_sap_find(addr->sllc_sap);
310 sap = llc_sap_open(addr->sllc_sap, NULL);
311 rc = -EBUSY; /* some other network layer is using the sap */
315 struct llc_addr laddr, daddr;
318 memset(&laddr, 0, sizeof(laddr));
319 memset(&daddr, 0, sizeof(daddr));
321 * FIXME: check if the the address is multicast,
322 * only SOCK_DGRAM can do this.
324 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
325 laddr.lsap = addr->sllc_sap;
326 rc = -EADDRINUSE; /* mac + sap clash. */
327 ask = llc_lookup_established(sap, &daddr, &laddr);
333 llc->laddr.lsap = addr->sllc_sap;
334 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
335 memcpy(&llc->addr, addr, sizeof(llc->addr));
336 /* assign new connection to its SAP */
337 llc_sap_add_socket(sap, sk);
338 sock_reset_flag(sk, SOCK_ZAPPED);
345 * llc_ui_shutdown - shutdown a connect llc2 socket.
346 * @sock: Socket to shutdown.
347 * @how: What part of the socket to shutdown.
349 * Shutdown a connected llc2 socket. Currently this function only supports
350 * shutting down both sends and receives (2), we could probably make this
351 * function such that a user can shutdown only half the connection but not
353 * Returns: 0 upon success, negative otherwise.
355 static int llc_ui_shutdown(struct socket *sock, int how)
357 struct sock *sk = sock->sk;
361 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
366 rc = llc_send_disc(sk);
368 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
369 /* Wake up anyone sleeping in poll */
370 sk->sk_state_change(sk);
377 * llc_ui_connect - Connect to a remote llc2 mac + sap.
378 * @sock: Socket which will be connected to the remote destination.
379 * @uaddr: Remote and possibly the local address of the new connection.
380 * @addrlen: Size of uaddr structure.
381 * @flags: Operational flags specified by the user.
383 * Connect to a remote llc2 mac + sap. The caller must specify the
384 * destination mac and address to connect to. If the user hasn't previously
385 * called bind(2) with a smac the address of the first interface of the
386 * specified arp type will be used.
387 * This function will autobind if user did not previously call bind.
388 * Returns: 0 upon success, negative otherwise.
390 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
391 int addrlen, int flags)
393 struct sock *sk = sock->sk;
394 struct llc_sock *llc = llc_sk(sk);
395 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
399 if (unlikely(addrlen != sizeof(*addr)))
402 if (unlikely(addr->sllc_family != AF_LLC))
404 if (unlikely(sk->sk_type != SOCK_STREAM))
407 if (unlikely(sock->state == SS_CONNECTING))
409 /* bind connection to sap if user hasn't done it. */
410 if (sock_flag(sk, SOCK_ZAPPED)) {
411 /* bind to sap with null dev, exclusive */
412 rc = llc_ui_autobind(sock, addr);
415 llc->daddr.lsap = addr->sllc_sap;
416 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
418 sock->state = SS_CONNECTING;
419 sk->sk_state = TCP_SYN_SENT;
420 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
421 rc = llc_establish_connection(sk, llc->dev->dev_addr,
422 addr->sllc_mac, addr->sllc_sap);
424 dprintk("%s: llc_ui_send_conn failed :-(\n", __FUNCTION__);
425 sock->state = SS_UNCONNECTED;
426 sk->sk_state = TCP_CLOSE;
430 if (sk->sk_state == TCP_SYN_SENT) {
431 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
433 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
436 rc = sock_intr_errno(timeo);
437 if (signal_pending(current))
441 if (sk->sk_state == TCP_CLOSE)
444 sock->state = SS_CONNECTED;
450 rc = sock_error(sk) ? : -ECONNABORTED;
451 sock->state = SS_UNCONNECTED;
456 * llc_ui_listen - allow a normal socket to accept incoming connections
457 * @sock: Socket to allow incoming connections on.
458 * @backlog: Number of connections to queue.
460 * Allow a normal socket to accept incoming connections.
461 * Returns 0 upon success, negative otherwise.
463 static int llc_ui_listen(struct socket *sock, int backlog)
465 struct sock *sk = sock->sk;
469 if (unlikely(sock->state != SS_UNCONNECTED))
472 if (unlikely(sk->sk_type != SOCK_STREAM))
475 if (sock_flag(sk, SOCK_ZAPPED))
478 if (!(unsigned)backlog) /* BSDism */
480 sk->sk_max_ack_backlog = backlog;
481 if (sk->sk_state != TCP_LISTEN) {
482 sk->sk_ack_backlog = 0;
483 sk->sk_state = TCP_LISTEN;
485 sk->sk_socket->flags |= __SO_ACCEPTCON;
491 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
497 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
498 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
501 if (signal_pending(current))
508 finish_wait(sk->sk_sleep, &wait);
512 static int llc_ui_wait_for_conn(struct sock *sk, long timeout)
517 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
518 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
520 if (signal_pending(current) || !timeout)
523 finish_wait(sk->sk_sleep, &wait);
527 static int llc_ui_wait_for_data(struct sock *sk, long timeout)
533 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
534 if (sk_wait_event(sk, &timeout,
535 (sk->sk_shutdown & RCV_SHUTDOWN) ||
536 (!skb_queue_empty(&sk->sk_receive_queue))))
539 if (signal_pending(current))
546 finish_wait(sk->sk_sleep, &wait);
550 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
553 struct llc_sock *llc = llc_sk(sk);
557 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
559 if (sk_wait_event(sk, &timeout,
560 (sk->sk_shutdown & RCV_SHUTDOWN) ||
561 (!llc_data_accept_state(llc->state) &&
565 if (signal_pending(current))
571 finish_wait(sk->sk_sleep, &wait);
576 * llc_ui_accept - accept a new incoming connection.
577 * @sock: Socket which connections arrive on.
578 * @newsock: Socket to move incoming connection to.
579 * @flags: User specified operational flags.
581 * Accept a new incoming connection.
582 * Returns 0 upon success, negative otherwise.
584 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
586 struct sock *sk = sock->sk, *newsk;
587 struct llc_sock *llc, *newllc;
589 int rc = -EOPNOTSUPP;
591 dprintk("%s: accepting on %02X\n", __FUNCTION__,
592 llc_sk(sk)->laddr.lsap);
594 if (unlikely(sk->sk_type != SOCK_STREAM))
597 if (unlikely(sock->state != SS_UNCONNECTED ||
598 sk->sk_state != TCP_LISTEN))
600 /* wait for a connection to arrive. */
601 if (skb_queue_empty(&sk->sk_receive_queue)) {
602 rc = llc_ui_wait_for_data(sk, sk->sk_rcvtimeo);
606 dprintk("%s: got a new connection on %02X\n", __FUNCTION__,
607 llc_sk(sk)->laddr.lsap);
608 skb = skb_dequeue(&sk->sk_receive_queue);
614 /* attach connection to a new socket. */
615 llc_ui_sk_init(newsock, newsk);
616 sock_reset_flag(newsk, SOCK_ZAPPED);
617 newsk->sk_state = TCP_ESTABLISHED;
618 newsock->state = SS_CONNECTED;
620 newllc = llc_sk(newsk);
621 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
622 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
624 /* put original socket back into a clean listen state. */
625 sk->sk_state = TCP_LISTEN;
626 sk->sk_ack_backlog--;
628 dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__,
629 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
638 * llc_ui_recvmsg - copy received data to the socket user.
639 * @sock: Socket to copy data from.
640 * @msg: Various user space related information.
641 * @size: Size of user buffer.
642 * @flags: User specified flags.
644 * Copy received data to the socket user.
645 * Returns non-negative upon success, negative otherwise.
647 static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
648 struct msghdr *msg, size_t size, int flags)
650 struct sock *sk = sock->sk;
651 struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
655 int noblock = flags & MSG_DONTWAIT;
657 dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__,
658 llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
660 if (skb_queue_empty(&sk->sk_receive_queue)) {
661 rc = llc_ui_wait_for_data(sk, sock_rcvtimeo(sk, noblock));
665 skb = skb_dequeue(&sk->sk_receive_queue);
666 if (!skb) /* shutdown */
671 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
674 if (skb->len > copied) {
675 skb_pull(skb, copied);
676 skb_queue_head(&sk->sk_receive_queue, skb);
679 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
680 msg->msg_namelen = sizeof(*uaddr);
687 return rc ? : copied;
691 * llc_ui_sendmsg - Transmit data provided by the socket user.
692 * @sock: Socket to transmit data from.
693 * @msg: Various user related information.
694 * @len: Length of data to transmit.
696 * Transmit data provided by the socket user.
697 * Returns non-negative upon success, negative otherwise.
699 static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
700 struct msghdr *msg, size_t len)
702 struct sock *sk = sock->sk;
703 struct llc_sock *llc = llc_sk(sk);
704 struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
705 int flags = msg->msg_flags;
706 int noblock = flags & MSG_DONTWAIT;
709 int rc = -EINVAL, copied = 0, hdrlen;
711 dprintk("%s: sending from %02X to %02X\n", __FUNCTION__,
712 llc->laddr.lsap, llc->daddr.lsap);
715 if (msg->msg_namelen < sizeof(*addr))
718 if (llc_ui_addr_null(&llc->addr))
722 /* must bind connection to sap if user hasn't done it. */
723 if (sock_flag(sk, SOCK_ZAPPED)) {
724 /* bind to sap with null dev, exclusive. */
725 rc = llc_ui_autobind(sock, addr);
729 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
731 if (size > llc->dev->mtu)
732 size = llc->dev->mtu;
733 copied = size - hdrlen;
735 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
741 skb->protocol = llc_proto_type(addr->sllc_arphrd);
742 skb_reserve(skb, hdrlen);
743 rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
746 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
747 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
751 if (addr->sllc_test) {
752 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
756 if (addr->sllc_xid) {
757 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
762 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
764 rc = llc_ui_send_data(sk, skb, noblock);
766 dprintk("%s: llc_ui_send_data failed: %d\n", __FUNCTION__, rc);
772 dprintk("%s: failed sending from %02X to %02X: %d\n",
773 __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc);
775 return rc ? : copied;
779 * llc_ui_getname - return the address info of a socket
780 * @sock: Socket to get address of.
781 * @uaddr: Address structure to return information.
782 * @uaddrlen: Length of address structure.
783 * @peer: Does user want local or remote address information.
785 * Return the address information of a socket.
787 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
788 int *uaddrlen, int peer)
790 struct sockaddr_llc sllc;
791 struct sock *sk = sock->sk;
792 struct llc_sock *llc = llc_sk(sk);
796 if (sock_flag(sk, SOCK_ZAPPED))
798 *uaddrlen = sizeof(sllc);
799 memset(uaddr, 0, *uaddrlen);
802 if (sk->sk_state != TCP_ESTABLISHED)
805 sllc.sllc_arphrd = llc->dev->type;
806 sllc.sllc_sap = llc->daddr.lsap;
807 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
812 sllc.sllc_sap = llc->sap->laddr.lsap;
815 sllc.sllc_arphrd = llc->dev->type;
816 memcpy(&sllc.sllc_mac, &llc->dev->dev_addr,
821 sllc.sllc_family = AF_LLC;
822 memcpy(uaddr, &sllc, sizeof(sllc));
829 * llc_ui_ioctl - io controls for PF_LLC
830 * @sock: Socket to get/set info
832 * @arg: optional argument for cmd
834 * get/set info on llc sockets
836 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
839 return dev_ioctl(cmd, (void __user *)arg);
843 * llc_ui_setsockopt - set various connection specific parameters.
844 * @sock: Socket to set options on.
845 * @level: Socket level user is requesting operations on.
846 * @optname: Operation name.
847 * @optval User provided operation data.
848 * @optlen: Length of optval.
850 * Set various connection specific parameters.
852 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
853 char __user *optval, int optlen)
855 struct sock *sk = sock->sk;
856 struct llc_sock *llc = llc_sk(sk);
857 int rc = -EINVAL, opt;
860 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
862 rc = get_user(opt, (int __user *)optval);
868 if (opt > LLC_OPT_MAX_RETRY)
873 if (opt > LLC_OPT_MAX_SIZE)
877 case LLC_OPT_ACK_TMR_EXP:
878 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
880 llc->ack_timer.expire = opt * HZ;
882 case LLC_OPT_P_TMR_EXP:
883 if (opt > LLC_OPT_MAX_P_TMR_EXP)
885 llc->pf_cycle_timer.expire = opt * HZ;
887 case LLC_OPT_REJ_TMR_EXP:
888 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
890 llc->rej_sent_timer.expire = opt * HZ;
892 case LLC_OPT_BUSY_TMR_EXP:
893 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
895 llc->busy_state_timer.expire = opt * HZ;
898 if (opt > LLC_OPT_MAX_WIN)
903 if (opt > LLC_OPT_MAX_WIN)
918 * llc_ui_getsockopt - get connection specific socket info
919 * @sock: Socket to get information from.
920 * @level: Socket level user is requesting operations on.
921 * @optname: Operation name.
922 * @optval: Variable to return operation data in.
923 * @optlen: Length of optval.
925 * Get connection specific socket information.
927 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
928 char __user *optval, int __user *optlen)
930 struct sock *sk = sock->sk;
931 struct llc_sock *llc = llc_sk(sk);
932 int val = 0, len = 0, rc = -EINVAL;
935 if (unlikely(level != SOL_LLC))
937 rc = get_user(len, optlen);
941 if (len != sizeof(int))
945 val = llc->n2; break;
947 val = llc->n1; break;
948 case LLC_OPT_ACK_TMR_EXP:
949 val = llc->ack_timer.expire / HZ; break;
950 case LLC_OPT_P_TMR_EXP:
951 val = llc->pf_cycle_timer.expire / HZ; break;
952 case LLC_OPT_REJ_TMR_EXP:
953 val = llc->rej_sent_timer.expire / HZ; break;
954 case LLC_OPT_BUSY_TMR_EXP:
955 val = llc->busy_state_timer.expire / HZ; break;
959 val = llc->rw; break;
965 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
972 static struct net_proto_family llc_ui_family_ops = {
974 .create = llc_ui_create,
975 .owner = THIS_MODULE,
978 static struct proto_ops llc_ui_ops = {
980 .owner = THIS_MODULE,
981 .release = llc_ui_release,
983 .connect = llc_ui_connect,
984 .socketpair = sock_no_socketpair,
985 .accept = llc_ui_accept,
986 .getname = llc_ui_getname,
987 .poll = datagram_poll,
988 .ioctl = llc_ui_ioctl,
989 .listen = llc_ui_listen,
990 .shutdown = llc_ui_shutdown,
991 .setsockopt = llc_ui_setsockopt,
992 .getsockopt = llc_ui_getsockopt,
993 .sendmsg = llc_ui_sendmsg,
994 .recvmsg = llc_ui_recvmsg,
995 .mmap = sock_no_mmap,
996 .sendpage = sock_no_sendpage,
999 extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
1000 extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
1002 static char llc_proc_err_msg[] __initdata =
1003 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1004 static char llc_sysctl_err_msg[] __initdata =
1005 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1006 static char llc_sock_err_msg[] __initdata =
1007 KERN_CRIT "LLC: Unable to register the network family\n";
1009 static int __init llc2_init(void)
1011 int rc = proto_register(&llc_proto, 0);
1016 llc_build_offset_table();
1018 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1019 rc = llc_proc_init();
1021 printk(llc_proc_err_msg);
1022 goto out_unregister_llc_proto;
1024 rc = llc_sysctl_init();
1026 printk(llc_sysctl_err_msg);
1029 rc = sock_register(&llc_ui_family_ops);
1031 printk(llc_sock_err_msg);
1034 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1035 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1042 out_unregister_llc_proto:
1043 proto_unregister(&llc_proto);
1047 static void __exit llc2_exit(void)
1050 llc_remove_pack(LLC_DEST_SAP);
1051 llc_remove_pack(LLC_DEST_CONN);
1052 sock_unregister(PF_LLC);
1055 proto_unregister(&llc_proto);
1058 module_init(llc2_init);
1059 module_exit(llc2_exit);
1061 MODULE_LICENSE("GPL");
1062 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1063 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1064 MODULE_ALIAS_NETPROTO(PF_LLC);