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/compiler.h>
25 #include <linux/kernel.h>
26 #include <linux/module.h>
27 #include <linux/rtnetlink.h>
28 #include <linux/init.h>
30 #include <net/llc_sap.h>
31 #include <net/llc_pdu.h>
32 #include <net/llc_conn.h>
33 #include <net/tcp_states.h>
35 /* remember: uninitialized global data is zeroed because its in .bss */
36 static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
37 static u16 llc_ui_sap_link_no_max[256];
38 static struct sockaddr_llc llc_ui_addrnull;
39 static struct proto_ops llc_ui_ops;
41 static int llc_ui_wait_for_conn(struct sock *sk, long timeout);
42 static int llc_ui_wait_for_disc(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 (unlikely(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);
201 * llc_ui_autoport - provide dynamically allocate SAP number
203 * Provide the caller with a dynamically allocated SAP number according
204 * to the rules that are set in this function. Returns: 0, upon failure,
205 * SAP number otherwise.
207 static int llc_ui_autoport(void)
212 while (tries < LLC_SAP_DYN_TRIES) {
213 for (i = llc_ui_sap_last_autoport;
214 i < LLC_SAP_DYN_STOP; i += 2) {
215 sap = llc_sap_find(i);
217 llc_ui_sap_last_autoport = i + 2;
222 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
231 * llc_ui_autobind - automatically bind a socket to a sap
232 * @sock: socket to bind
233 * @addr: address to connect to
235 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
236 * specifically used llc_ui_bind to bind to an specific address/sap
238 * Returns: 0 upon success, negative otherwise.
240 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
242 struct sock *sk = sock->sk;
243 struct llc_sock *llc = llc_sk(sk);
247 if (!sock_flag(sk, SOCK_ZAPPED))
250 llc->dev = dev_getfirstbyhwtype(addr->sllc_arphrd);
254 llc->laddr.lsap = llc_ui_autoport();
255 if (!llc->laddr.lsap)
257 rc = -EBUSY; /* some other network layer is using the sap */
258 sap = llc_sap_open(llc->laddr.lsap, NULL);
261 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
262 memcpy(&llc->addr, addr, sizeof(llc->addr));
263 /* assign new connection to its SAP */
264 llc_sap_add_socket(sap, sk);
265 sock_reset_flag(sk, SOCK_ZAPPED);
272 * llc_ui_bind - bind a socket to a specific address.
273 * @sock: Socket to bind an address to.
274 * @uaddr: Address the user wants the socket bound to.
275 * @addrlen: Length of the uaddr structure.
277 * Bind a socket to a specific address. For llc a user is able to bind to
278 * a specific sap only or mac + sap.
279 * If the user desires to bind to a specific mac + sap, it is possible to
280 * have multiple sap connections via multiple macs.
281 * Bind and autobind for that matter must enforce the correct sap usage
282 * otherwise all hell will break loose.
283 * Returns: 0 upon success, negative otherwise.
285 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
287 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
288 struct sock *sk = sock->sk;
289 struct llc_sock *llc = llc_sk(sk);
293 dprintk("%s: binding %02X\n", __FUNCTION__, addr->sllc_sap);
294 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
297 if (unlikely(addr->sllc_family != AF_LLC))
299 if (!addr->sllc_sap) {
301 addr->sllc_sap = llc_ui_autoport();
305 sap = llc_sap_find(addr->sllc_sap);
307 sap = llc_sap_open(addr->sllc_sap, NULL);
308 rc = -EBUSY; /* some other network layer is using the sap */
313 struct llc_addr laddr, daddr;
316 memset(&laddr, 0, sizeof(laddr));
317 memset(&daddr, 0, sizeof(daddr));
319 * FIXME: check if the the address is multicast,
320 * only SOCK_DGRAM can do this.
322 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
323 laddr.lsap = addr->sllc_sap;
324 rc = -EADDRINUSE; /* mac + sap clash. */
325 ask = llc_lookup_established(sap, &daddr, &laddr);
331 llc->laddr.lsap = addr->sllc_sap;
332 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
333 memcpy(&llc->addr, addr, sizeof(llc->addr));
334 /* assign new connection to its SAP */
335 llc_sap_add_socket(sap, sk);
336 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_busy_core(struct sock *sk, long timeout)
530 struct llc_sock *llc = llc_sk(sk);
534 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
536 if (sk_wait_event(sk, &timeout,
537 (sk->sk_shutdown & RCV_SHUTDOWN) ||
538 (!llc_data_accept_state(llc->state) &&
542 if (signal_pending(current))
548 finish_wait(sk->sk_sleep, &wait);
552 int llc_wait_data(struct sock *sk, long timeo)
558 * POSIX 1003.1g mandates this order.
565 if (sk->sk_shutdown & RCV_SHUTDOWN)
570 rc = sock_intr_errno(timeo);
571 if (signal_pending(current))
574 if (sk_wait_data(sk, &timeo))
581 * llc_ui_accept - accept a new incoming connection.
582 * @sock: Socket which connections arrive on.
583 * @newsock: Socket to move incoming connection to.
584 * @flags: User specified operational flags.
586 * Accept a new incoming connection.
587 * Returns 0 upon success, negative otherwise.
589 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
591 struct sock *sk = sock->sk, *newsk;
592 struct llc_sock *llc, *newllc;
594 int rc = -EOPNOTSUPP;
596 dprintk("%s: accepting on %02X\n", __FUNCTION__,
597 llc_sk(sk)->laddr.lsap);
599 if (unlikely(sk->sk_type != SOCK_STREAM))
602 if (unlikely(sock->state != SS_UNCONNECTED ||
603 sk->sk_state != TCP_LISTEN))
605 /* wait for a connection to arrive. */
606 if (skb_queue_empty(&sk->sk_receive_queue)) {
607 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
611 dprintk("%s: got a new connection on %02X\n", __FUNCTION__,
612 llc_sk(sk)->laddr.lsap);
613 skb = skb_dequeue(&sk->sk_receive_queue);
619 /* attach connection to a new socket. */
620 llc_ui_sk_init(newsock, newsk);
621 sock_reset_flag(newsk, SOCK_ZAPPED);
622 newsk->sk_state = TCP_ESTABLISHED;
623 newsock->state = SS_CONNECTED;
625 newllc = llc_sk(newsk);
626 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
627 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
629 /* put original socket back into a clean listen state. */
630 sk->sk_state = TCP_LISTEN;
631 sk->sk_ack_backlog--;
632 dprintk("%s: ok success on %02X, client on %02X\n", __FUNCTION__,
633 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
642 * llc_ui_recvmsg - copy received data to the socket user.
643 * @sock: Socket to copy data from.
644 * @msg: Various user space related information.
645 * @size: Size of user buffer.
646 * @flags: User specified flags.
648 * Copy received data to the socket user.
649 * Returns non-negative upon success, negative otherwise.
651 static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
652 struct msghdr *msg, size_t size, int flags)
654 struct sock *sk = sock->sk;
655 struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
659 int noblock = flags & MSG_DONTWAIT;
661 dprintk("%s: receiving in %02X from %02X\n", __FUNCTION__,
662 llc_sk(sk)->laddr.lsap, llc_sk(sk)->daddr.lsap);
664 if (skb_queue_empty(&sk->sk_receive_queue)) {
665 rc = llc_wait_data(sk, sock_rcvtimeo(sk, noblock));
669 skb = skb_dequeue(&sk->sk_receive_queue);
670 if (!skb) /* shutdown */
675 rc = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
678 if (skb->len > copied) {
679 skb_pull(skb, copied);
680 skb_queue_head(&sk->sk_receive_queue, skb);
683 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
684 msg->msg_namelen = sizeof(*uaddr);
691 return rc ? : copied;
695 * llc_ui_sendmsg - Transmit data provided by the socket user.
696 * @sock: Socket to transmit data from.
697 * @msg: Various user related information.
698 * @len: Length of data to transmit.
700 * Transmit data provided by the socket user.
701 * Returns non-negative upon success, negative otherwise.
703 static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
704 struct msghdr *msg, size_t len)
706 struct sock *sk = sock->sk;
707 struct llc_sock *llc = llc_sk(sk);
708 struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
709 int flags = msg->msg_flags;
710 int noblock = flags & MSG_DONTWAIT;
713 int rc = -EINVAL, copied = 0, hdrlen;
715 dprintk("%s: sending from %02X to %02X\n", __FUNCTION__,
716 llc->laddr.lsap, llc->daddr.lsap);
719 if (msg->msg_namelen < sizeof(*addr))
722 if (llc_ui_addr_null(&llc->addr))
726 /* must bind connection to sap if user hasn't done it. */
727 if (sock_flag(sk, SOCK_ZAPPED)) {
728 /* bind to sap with null dev, exclusive. */
729 rc = llc_ui_autobind(sock, addr);
733 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
735 if (size > llc->dev->mtu)
736 size = llc->dev->mtu;
737 copied = size - hdrlen;
739 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
744 skb->protocol = llc_proto_type(addr->sllc_arphrd);
745 skb_reserve(skb, hdrlen);
746 rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
749 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
750 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
754 if (addr->sllc_test) {
755 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
759 if (addr->sllc_xid) {
760 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
765 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
767 rc = llc_ui_send_data(sk, skb, noblock);
772 dprintk("%s: failed sending from %02X to %02X: %d\n",
773 __FUNCTION__, llc->laddr.lsap, llc->daddr.lsap, rc);
776 return rc ? : copied;
780 * llc_ui_getname - return the address info of a socket
781 * @sock: Socket to get address of.
782 * @uaddr: Address structure to return information.
783 * @uaddrlen: Length of address structure.
784 * @peer: Does user want local or remote address information.
786 * Return the address information of a socket.
788 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
789 int *uaddrlen, int peer)
791 struct sockaddr_llc sllc;
792 struct sock *sk = sock->sk;
793 struct llc_sock *llc = llc_sk(sk);
797 if (sock_flag(sk, SOCK_ZAPPED))
799 *uaddrlen = sizeof(sllc);
800 memset(uaddr, 0, *uaddrlen);
803 if (sk->sk_state != TCP_ESTABLISHED)
806 sllc.sllc_arphrd = llc->dev->type;
807 sllc.sllc_sap = llc->daddr.lsap;
808 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
813 sllc.sllc_sap = llc->sap->laddr.lsap;
816 sllc.sllc_arphrd = llc->dev->type;
817 memcpy(&sllc.sllc_mac, &llc->dev->dev_addr,
822 sllc.sllc_family = AF_LLC;
823 memcpy(uaddr, &sllc, sizeof(sllc));
830 * llc_ui_ioctl - io controls for PF_LLC
831 * @sock: Socket to get/set info
833 * @arg: optional argument for cmd
835 * get/set info on llc sockets
837 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
840 return dev_ioctl(cmd, (void __user *)arg);
844 * llc_ui_setsockopt - set various connection specific parameters.
845 * @sock: Socket to set options on.
846 * @level: Socket level user is requesting operations on.
847 * @optname: Operation name.
848 * @optval User provided operation data.
849 * @optlen: Length of optval.
851 * Set various connection specific parameters.
853 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
854 char __user *optval, int optlen)
856 struct sock *sk = sock->sk;
857 struct llc_sock *llc = llc_sk(sk);
858 int rc = -EINVAL, opt;
861 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
863 rc = get_user(opt, (int __user *)optval);
869 if (opt > LLC_OPT_MAX_RETRY)
874 if (opt > LLC_OPT_MAX_SIZE)
878 case LLC_OPT_ACK_TMR_EXP:
879 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
881 llc->ack_timer.expire = opt * HZ;
883 case LLC_OPT_P_TMR_EXP:
884 if (opt > LLC_OPT_MAX_P_TMR_EXP)
886 llc->pf_cycle_timer.expire = opt * HZ;
888 case LLC_OPT_REJ_TMR_EXP:
889 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
891 llc->rej_sent_timer.expire = opt * HZ;
893 case LLC_OPT_BUSY_TMR_EXP:
894 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
896 llc->busy_state_timer.expire = opt * HZ;
899 if (opt > LLC_OPT_MAX_WIN)
904 if (opt > LLC_OPT_MAX_WIN)
919 * llc_ui_getsockopt - get connection specific socket info
920 * @sock: Socket to get information from.
921 * @level: Socket level user is requesting operations on.
922 * @optname: Operation name.
923 * @optval: Variable to return operation data in.
924 * @optlen: Length of optval.
926 * Get connection specific socket information.
928 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
929 char __user *optval, int __user *optlen)
931 struct sock *sk = sock->sk;
932 struct llc_sock *llc = llc_sk(sk);
933 int val = 0, len = 0, rc = -EINVAL;
936 if (unlikely(level != SOL_LLC))
938 rc = get_user(len, optlen);
942 if (len != sizeof(int))
946 val = llc->n2; break;
948 val = llc->n1; break;
949 case LLC_OPT_ACK_TMR_EXP:
950 val = llc->ack_timer.expire / HZ; break;
951 case LLC_OPT_P_TMR_EXP:
952 val = llc->pf_cycle_timer.expire / HZ; break;
953 case LLC_OPT_REJ_TMR_EXP:
954 val = llc->rej_sent_timer.expire / HZ; break;
955 case LLC_OPT_BUSY_TMR_EXP:
956 val = llc->busy_state_timer.expire / HZ; break;
960 val = llc->rw; break;
966 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
973 static struct net_proto_family llc_ui_family_ops = {
975 .create = llc_ui_create,
976 .owner = THIS_MODULE,
979 static struct proto_ops llc_ui_ops = {
981 .owner = THIS_MODULE,
982 .release = llc_ui_release,
984 .connect = llc_ui_connect,
985 .socketpair = sock_no_socketpair,
986 .accept = llc_ui_accept,
987 .getname = llc_ui_getname,
988 .poll = datagram_poll,
989 .ioctl = llc_ui_ioctl,
990 .listen = llc_ui_listen,
991 .shutdown = llc_ui_shutdown,
992 .setsockopt = llc_ui_setsockopt,
993 .getsockopt = llc_ui_getsockopt,
994 .sendmsg = llc_ui_sendmsg,
995 .recvmsg = llc_ui_recvmsg,
996 .mmap = sock_no_mmap,
997 .sendpage = sock_no_sendpage,
1000 extern void llc_sap_handler(struct llc_sap *sap, struct sk_buff *skb);
1001 extern void llc_conn_handler(struct llc_sap *sap, struct sk_buff *skb);
1003 static char llc_proc_err_msg[] __initdata =
1004 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1005 static char llc_sysctl_err_msg[] __initdata =
1006 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1007 static char llc_sock_err_msg[] __initdata =
1008 KERN_CRIT "LLC: Unable to register the network family\n";
1010 static int __init llc2_init(void)
1012 int rc = proto_register(&llc_proto, 0);
1017 llc_build_offset_table();
1019 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1020 rc = llc_proc_init();
1022 printk(llc_proc_err_msg);
1023 goto out_unregister_llc_proto;
1025 rc = llc_sysctl_init();
1027 printk(llc_sysctl_err_msg);
1030 rc = sock_register(&llc_ui_family_ops);
1032 printk(llc_sock_err_msg);
1035 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1036 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1043 out_unregister_llc_proto:
1044 proto_unregister(&llc_proto);
1048 static void __exit llc2_exit(void)
1051 llc_remove_pack(LLC_DEST_SAP);
1052 llc_remove_pack(LLC_DEST_CONN);
1053 sock_unregister(PF_LLC);
1056 proto_unregister(&llc_proto);
1059 module_init(llc2_init);
1060 module_exit(llc2_exit);
1062 MODULE_LICENSE("GPL");
1063 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1064 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1065 MODULE_ALIAS_NETPROTO(PF_LLC);