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/compiler.h>
24 #include <linux/kernel.h>
25 #include <linux/module.h>
26 #include <linux/rtnetlink.h>
27 #include <linux/init.h>
28 #include <linux/slab.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 const 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...)
51 /* Maybe we'll add some more in the future. */
52 #define LLC_CMSG_PKTINFO 1
56 * llc_ui_next_link_no - return the next unused link number for a sap
57 * @sap: Address of sap to get link number from.
59 * Return the next unused link number for a given sap.
61 static inline u16 llc_ui_next_link_no(int sap)
63 return llc_ui_sap_link_no_max[sap]++;
67 * llc_proto_type - return eth protocol for ARP header type
68 * @arphrd: ARP header type.
70 * Given an ARP header type return the corresponding ethernet protocol.
72 static inline __be16 llc_proto_type(u16 arphrd)
74 return arphrd == ARPHRD_IEEE802_TR ?
75 htons(ETH_P_TR_802_2) : htons(ETH_P_802_2);
79 * llc_ui_addr_null - determines if a address structure is null
80 * @addr: Address to test if null.
82 static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
84 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
88 * llc_ui_header_len - return length of llc header based on operation
89 * @sk: Socket which contains a valid llc socket type.
90 * @addr: Complete sockaddr_llc structure received from the user.
92 * Provide the length of the llc header depending on what kind of
93 * operation the user would like to perform and the type of socket.
94 * Returns the correct llc header length.
96 static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
98 u8 rc = LLC_PDU_LEN_U;
100 if (addr->sllc_test || addr->sllc_xid)
102 else if (sk->sk_type == SOCK_STREAM)
108 * llc_ui_send_data - send data via reliable llc2 connection
109 * @sk: Connection the socket is using.
110 * @skb: Data the user wishes to send.
111 * @noblock: can we block waiting for data?
113 * Send data via reliable llc2 connection.
114 * Returns 0 upon success, non-zero if action did not succeed.
116 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
118 struct llc_sock* llc = llc_sk(sk);
121 if (unlikely(llc_data_accept_state(llc->state) ||
122 llc->remote_busy_flag ||
124 long timeout = sock_sndtimeo(sk, noblock);
126 rc = llc_ui_wait_for_busy_core(sk, timeout);
129 rc = llc_build_and_send_pkt(sk, skb);
133 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
135 sock_graft(sk, sock);
136 sk->sk_type = sock->type;
137 sock->ops = &llc_ui_ops;
140 static struct proto llc_proto = {
142 .owner = THIS_MODULE,
143 .obj_size = sizeof(struct llc_sock),
144 .slab_flags = SLAB_DESTROY_BY_RCU,
148 * llc_ui_create - alloc and init a new llc_ui socket
149 * @net: network namespace (must be default network)
150 * @sock: Socket to initialize and attach allocated sk to.
152 * @kern: on behalf of kernel or userspace
154 * Allocate and initialize a new llc_ui socket, validate the user wants a
155 * socket type we have available.
156 * Returns 0 upon success, negative upon failure.
158 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
162 int rc = -ESOCKTNOSUPPORT;
164 if (!capable(CAP_NET_RAW))
167 if (!net_eq(net, &init_net))
168 return -EAFNOSUPPORT;
170 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
172 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto);
175 llc_ui_sk_init(sock, sk);
182 * llc_ui_release - shutdown socket
183 * @sock: Socket to release.
185 * Shutdown and deallocate an existing socket.
187 static int llc_ui_release(struct socket *sock)
189 struct sock *sk = sock->sk;
190 struct llc_sock *llc;
192 if (unlikely(sk == NULL))
197 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
198 llc->laddr.lsap, llc->daddr.lsap);
199 if (!llc_send_disc(sk))
200 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
201 if (!sock_flag(sk, SOCK_ZAPPED))
202 llc_sap_remove_socket(llc->sap, sk);
213 * llc_ui_autoport - provide dynamically allocate SAP number
215 * Provide the caller with a dynamically allocated SAP number according
216 * to the rules that are set in this function. Returns: 0, upon failure,
217 * SAP number otherwise.
219 static int llc_ui_autoport(void)
224 while (tries < LLC_SAP_DYN_TRIES) {
225 for (i = llc_ui_sap_last_autoport;
226 i < LLC_SAP_DYN_STOP; i += 2) {
227 sap = llc_sap_find(i);
229 llc_ui_sap_last_autoport = i + 2;
234 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
243 * llc_ui_autobind - automatically bind a socket to a sap
244 * @sock: socket to bind
245 * @addr: address to connect to
247 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
248 * specifically used llc_ui_bind to bind to an specific address/sap
250 * Returns: 0 upon success, negative otherwise.
252 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
254 struct sock *sk = sock->sk;
255 struct llc_sock *llc = llc_sk(sk);
259 if (!sock_flag(sk, SOCK_ZAPPED))
262 if (sk->sk_bound_dev_if) {
263 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
264 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
269 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
273 llc->laddr.lsap = llc_ui_autoport();
274 if (!llc->laddr.lsap)
276 rc = -EBUSY; /* some other network layer is using the sap */
277 sap = llc_sap_open(llc->laddr.lsap, NULL);
280 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
281 memcpy(&llc->addr, addr, sizeof(llc->addr));
282 /* assign new connection to its SAP */
283 llc_sap_add_socket(sap, sk);
284 sock_reset_flag(sk, SOCK_ZAPPED);
291 * llc_ui_bind - bind a socket to a specific address.
292 * @sock: Socket to bind an address to.
293 * @uaddr: Address the user wants the socket bound to.
294 * @addrlen: Length of the uaddr structure.
296 * Bind a socket to a specific address. For llc a user is able to bind to
297 * a specific sap only or mac + sap.
298 * If the user desires to bind to a specific mac + sap, it is possible to
299 * have multiple sap connections via multiple macs.
300 * Bind and autobind for that matter must enforce the correct sap usage
301 * otherwise all hell will break loose.
302 * Returns: 0 upon success, negative otherwise.
304 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
306 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
307 struct sock *sk = sock->sk;
308 struct llc_sock *llc = llc_sk(sk);
312 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
313 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
316 if (unlikely(addr->sllc_family != AF_LLC))
320 if (sk->sk_bound_dev_if) {
321 llc->dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
323 if (!addr->sllc_arphrd)
324 addr->sllc_arphrd = llc->dev->type;
325 if (llc_mac_null(addr->sllc_mac))
326 memcpy(addr->sllc_mac, llc->dev->dev_addr,
328 if (addr->sllc_arphrd != llc->dev->type ||
329 !llc_mac_match(addr->sllc_mac,
330 llc->dev->dev_addr)) {
336 llc->dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
343 if (!addr->sllc_sap) {
345 addr->sllc_sap = llc_ui_autoport();
349 sap = llc_sap_find(addr->sllc_sap);
351 sap = llc_sap_open(addr->sllc_sap, NULL);
352 rc = -EBUSY; /* some other network layer is using the sap */
356 struct llc_addr laddr, daddr;
359 memset(&laddr, 0, sizeof(laddr));
360 memset(&daddr, 0, sizeof(daddr));
362 * FIXME: check if the address is multicast,
363 * only SOCK_DGRAM can do this.
365 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
366 laddr.lsap = addr->sllc_sap;
367 rc = -EADDRINUSE; /* mac + sap clash. */
368 ask = llc_lookup_established(sap, &daddr, &laddr);
374 llc->laddr.lsap = addr->sllc_sap;
375 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
376 memcpy(&llc->addr, addr, sizeof(llc->addr));
377 /* assign new connection to its SAP */
378 llc_sap_add_socket(sap, sk);
379 sock_reset_flag(sk, SOCK_ZAPPED);
388 * llc_ui_shutdown - shutdown a connect llc2 socket.
389 * @sock: Socket to shutdown.
390 * @how: What part of the socket to shutdown.
392 * Shutdown a connected llc2 socket. Currently this function only supports
393 * shutting down both sends and receives (2), we could probably make this
394 * function such that a user can shutdown only half the connection but not
396 * Returns: 0 upon success, negative otherwise.
398 static int llc_ui_shutdown(struct socket *sock, int how)
400 struct sock *sk = sock->sk;
404 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
409 rc = llc_send_disc(sk);
411 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
412 /* Wake up anyone sleeping in poll */
413 sk->sk_state_change(sk);
420 * llc_ui_connect - Connect to a remote llc2 mac + sap.
421 * @sock: Socket which will be connected to the remote destination.
422 * @uaddr: Remote and possibly the local address of the new connection.
423 * @addrlen: Size of uaddr structure.
424 * @flags: Operational flags specified by the user.
426 * Connect to a remote llc2 mac + sap. The caller must specify the
427 * destination mac and address to connect to. If the user hasn't previously
428 * called bind(2) with a smac the address of the first interface of the
429 * specified arp type will be used.
430 * This function will autobind if user did not previously call bind.
431 * Returns: 0 upon success, negative otherwise.
433 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
434 int addrlen, int flags)
436 struct sock *sk = sock->sk;
437 struct llc_sock *llc = llc_sk(sk);
438 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
442 if (unlikely(addrlen != sizeof(*addr)))
445 if (unlikely(addr->sllc_family != AF_LLC))
447 if (unlikely(sk->sk_type != SOCK_STREAM))
450 if (unlikely(sock->state == SS_CONNECTING))
452 /* bind connection to sap if user hasn't done it. */
453 if (sock_flag(sk, SOCK_ZAPPED)) {
454 /* bind to sap with null dev, exclusive */
455 rc = llc_ui_autobind(sock, addr);
459 llc->daddr.lsap = addr->sllc_sap;
460 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
461 sock->state = SS_CONNECTING;
462 sk->sk_state = TCP_SYN_SENT;
463 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
464 rc = llc_establish_connection(sk, llc->dev->dev_addr,
465 addr->sllc_mac, addr->sllc_sap);
467 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
468 sock->state = SS_UNCONNECTED;
469 sk->sk_state = TCP_CLOSE;
473 if (sk->sk_state == TCP_SYN_SENT) {
474 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
476 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
479 rc = sock_intr_errno(timeo);
480 if (signal_pending(current))
484 if (sk->sk_state == TCP_CLOSE)
487 sock->state = SS_CONNECTED;
493 rc = sock_error(sk) ? : -ECONNABORTED;
494 sock->state = SS_UNCONNECTED;
499 * llc_ui_listen - allow a normal socket to accept incoming connections
500 * @sock: Socket to allow incoming connections on.
501 * @backlog: Number of connections to queue.
503 * Allow a normal socket to accept incoming connections.
504 * Returns 0 upon success, negative otherwise.
506 static int llc_ui_listen(struct socket *sock, int backlog)
508 struct sock *sk = sock->sk;
512 if (unlikely(sock->state != SS_UNCONNECTED))
515 if (unlikely(sk->sk_type != SOCK_STREAM))
518 if (sock_flag(sk, SOCK_ZAPPED))
521 if (!(unsigned)backlog) /* BSDism */
523 sk->sk_max_ack_backlog = backlog;
524 if (sk->sk_state != TCP_LISTEN) {
525 sk->sk_ack_backlog = 0;
526 sk->sk_state = TCP_LISTEN;
528 sk->sk_socket->flags |= __SO_ACCEPTCON;
534 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
540 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
541 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
544 if (signal_pending(current))
551 finish_wait(sk_sleep(sk), &wait);
555 static int llc_ui_wait_for_conn(struct sock *sk, long timeout)
560 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
561 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
563 if (signal_pending(current) || !timeout)
566 finish_wait(sk_sleep(sk), &wait);
570 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
573 struct llc_sock *llc = llc_sk(sk);
577 prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
579 if (sk_wait_event(sk, &timeout,
580 (sk->sk_shutdown & RCV_SHUTDOWN) ||
581 (!llc_data_accept_state(llc->state) &&
582 !llc->remote_busy_flag &&
586 if (signal_pending(current))
592 finish_wait(sk_sleep(sk), &wait);
596 static int llc_wait_data(struct sock *sk, long timeo)
602 * POSIX 1003.1g mandates this order.
608 if (sk->sk_shutdown & RCV_SHUTDOWN)
613 rc = sock_intr_errno(timeo);
614 if (signal_pending(current))
617 if (sk_wait_data(sk, &timeo))
623 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
625 struct llc_sock *llc = llc_sk(skb->sk);
627 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
628 struct llc_pktinfo info;
630 memset(&info, 0, sizeof(info));
631 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
632 llc_pdu_decode_dsap(skb, &info.lpi_sap);
633 llc_pdu_decode_da(skb, info.lpi_mac);
634 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
639 * llc_ui_accept - accept a new incoming connection.
640 * @sock: Socket which connections arrive on.
641 * @newsock: Socket to move incoming connection to.
642 * @flags: User specified operational flags.
644 * Accept a new incoming connection.
645 * Returns 0 upon success, negative otherwise.
647 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags)
649 struct sock *sk = sock->sk, *newsk;
650 struct llc_sock *llc, *newllc;
652 int rc = -EOPNOTSUPP;
654 dprintk("%s: accepting on %02X\n", __func__,
655 llc_sk(sk)->laddr.lsap);
657 if (unlikely(sk->sk_type != SOCK_STREAM))
660 if (unlikely(sock->state != SS_UNCONNECTED ||
661 sk->sk_state != TCP_LISTEN))
663 /* wait for a connection to arrive. */
664 if (skb_queue_empty(&sk->sk_receive_queue)) {
665 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
669 dprintk("%s: got a new connection on %02X\n", __func__,
670 llc_sk(sk)->laddr.lsap);
671 skb = skb_dequeue(&sk->sk_receive_queue);
677 /* attach connection to a new socket. */
678 llc_ui_sk_init(newsock, newsk);
679 sock_reset_flag(newsk, SOCK_ZAPPED);
680 newsk->sk_state = TCP_ESTABLISHED;
681 newsock->state = SS_CONNECTED;
683 newllc = llc_sk(newsk);
684 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
685 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
687 /* put original socket back into a clean listen state. */
688 sk->sk_state = TCP_LISTEN;
689 sk->sk_ack_backlog--;
690 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
691 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
700 * llc_ui_recvmsg - copy received data to the socket user.
701 * @sock: Socket to copy data from.
702 * @msg: Various user space related information.
703 * @len: Size of user buffer.
704 * @flags: User specified flags.
706 * Copy received data to the socket user.
707 * Returns non-negative upon success, negative otherwise.
709 static int llc_ui_recvmsg(struct kiocb *iocb, struct socket *sock,
710 struct msghdr *msg, size_t len, int flags)
712 struct sockaddr_llc *uaddr = (struct sockaddr_llc *)msg->msg_name;
713 const int nonblock = flags & MSG_DONTWAIT;
714 struct sk_buff *skb = NULL;
715 struct sock *sk = sock->sk;
716 struct llc_sock *llc = llc_sk(sk);
721 int target; /* Read at least this many bytes */
726 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
729 timeo = sock_rcvtimeo(sk, nonblock);
731 seq = &llc->copied_seq;
732 if (flags & MSG_PEEK) {
733 peek_seq = llc->copied_seq;
737 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
744 * We need to check signals first, to get correct SIGURG
745 * handling. FIXME: Need to check this doesn't impact 1003.1g
746 * and move it down to the bottom of the loop
748 if (signal_pending(current)) {
751 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
755 /* Next get a buffer. */
757 skb = skb_peek(&sk->sk_receive_queue);
762 /* Well, if we have backlog, try to process it now yet. */
764 if (copied >= target && !sk->sk_backlog.tail)
769 sk->sk_state == TCP_CLOSE ||
770 (sk->sk_shutdown & RCV_SHUTDOWN) ||
775 if (sock_flag(sk, SOCK_DONE))
779 copied = sock_error(sk);
782 if (sk->sk_shutdown & RCV_SHUTDOWN)
785 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
786 if (!sock_flag(sk, SOCK_DONE)) {
788 * This occurs when user tries to read
789 * from never connected socket.
802 if (copied >= target) { /* Do not sleep, just process backlog. */
806 sk_wait_data(sk, &timeo);
808 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
810 printk(KERN_DEBUG "LLC(%s:%d): Application "
811 "bug, race in MSG_PEEK.\n",
812 current->comm, task_pid_nr(current));
813 peek_seq = llc->copied_seq;
818 /* Ok so how much can we use? */
819 used = skb->len - offset;
823 if (!(flags & MSG_TRUNC)) {
824 int rc = skb_copy_datagram_iovec(skb, offset,
827 /* Exception. Bailout! */
838 /* For non stream protcols we get one packet per recvmsg call */
839 if (sk->sk_type != SOCK_STREAM)
842 if (!(flags & MSG_PEEK)) {
843 sk_eat_skb(sk, skb, 0);
848 if (used + offset < skb_len)
856 if (uaddr != NULL && skb != NULL) {
857 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
858 msg->msg_namelen = sizeof(*uaddr);
860 if (llc_sk(sk)->cmsg_flags)
861 llc_cmsg_rcv(msg, skb);
863 if (!(flags & MSG_PEEK)) {
864 sk_eat_skb(sk, skb, 0);
872 * llc_ui_sendmsg - Transmit data provided by the socket user.
873 * @sock: Socket to transmit data from.
874 * @msg: Various user related information.
875 * @len: Length of data to transmit.
877 * Transmit data provided by the socket user.
878 * Returns non-negative upon success, negative otherwise.
880 static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
881 struct msghdr *msg, size_t len)
883 struct sock *sk = sock->sk;
884 struct llc_sock *llc = llc_sk(sk);
885 struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
886 int flags = msg->msg_flags;
887 int noblock = flags & MSG_DONTWAIT;
890 int rc = -EINVAL, copied = 0, hdrlen;
892 dprintk("%s: sending from %02X to %02X\n", __func__,
893 llc->laddr.lsap, llc->daddr.lsap);
896 if (msg->msg_namelen < sizeof(*addr))
899 if (llc_ui_addr_null(&llc->addr))
903 /* must bind connection to sap if user hasn't done it. */
904 if (sock_flag(sk, SOCK_ZAPPED)) {
905 /* bind to sap with null dev, exclusive. */
906 rc = llc_ui_autobind(sock, addr);
910 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
912 if (size > llc->dev->mtu)
913 size = llc->dev->mtu;
914 copied = size - hdrlen;
916 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
921 skb->protocol = llc_proto_type(addr->sllc_arphrd);
922 skb_reserve(skb, hdrlen);
923 rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
926 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
927 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
931 if (addr->sllc_test) {
932 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
936 if (addr->sllc_xid) {
937 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
942 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
944 rc = llc_ui_send_data(sk, skb, noblock);
949 dprintk("%s: failed sending from %02X to %02X: %d\n",
950 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
953 return rc ? : copied;
957 * llc_ui_getname - return the address info of a socket
958 * @sock: Socket to get address of.
959 * @uaddr: Address structure to return information.
960 * @uaddrlen: Length of address structure.
961 * @peer: Does user want local or remote address information.
963 * Return the address information of a socket.
965 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
966 int *uaddrlen, int peer)
968 struct sockaddr_llc sllc;
969 struct sock *sk = sock->sk;
970 struct llc_sock *llc = llc_sk(sk);
973 memset(&sllc, 0, sizeof(sllc));
975 if (sock_flag(sk, SOCK_ZAPPED))
977 *uaddrlen = sizeof(sllc);
980 if (sk->sk_state != TCP_ESTABLISHED)
983 sllc.sllc_arphrd = llc->dev->type;
984 sllc.sllc_sap = llc->daddr.lsap;
985 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
990 sllc.sllc_sap = llc->sap->laddr.lsap;
993 sllc.sllc_arphrd = llc->dev->type;
994 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
999 sllc.sllc_family = AF_LLC;
1000 memcpy(uaddr, &sllc, sizeof(sllc));
1007 * llc_ui_ioctl - io controls for PF_LLC
1008 * @sock: Socket to get/set info
1010 * @arg: optional argument for cmd
1012 * get/set info on llc sockets
1014 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1017 return -ENOIOCTLCMD;
1021 * llc_ui_setsockopt - set various connection specific parameters.
1022 * @sock: Socket to set options on.
1023 * @level: Socket level user is requesting operations on.
1024 * @optname: Operation name.
1025 * @optval User provided operation data.
1026 * @optlen: Length of optval.
1028 * Set various connection specific parameters.
1030 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1031 char __user *optval, unsigned int optlen)
1033 struct sock *sk = sock->sk;
1034 struct llc_sock *llc = llc_sk(sk);
1039 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1041 rc = get_user(opt, (int __user *)optval);
1047 if (opt > LLC_OPT_MAX_RETRY)
1052 if (opt > LLC_OPT_MAX_SIZE)
1056 case LLC_OPT_ACK_TMR_EXP:
1057 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1059 llc->ack_timer.expire = opt * HZ;
1061 case LLC_OPT_P_TMR_EXP:
1062 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1064 llc->pf_cycle_timer.expire = opt * HZ;
1066 case LLC_OPT_REJ_TMR_EXP:
1067 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1069 llc->rej_sent_timer.expire = opt * HZ;
1071 case LLC_OPT_BUSY_TMR_EXP:
1072 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1074 llc->busy_state_timer.expire = opt * HZ;
1076 case LLC_OPT_TX_WIN:
1077 if (opt > LLC_OPT_MAX_WIN)
1081 case LLC_OPT_RX_WIN:
1082 if (opt > LLC_OPT_MAX_WIN)
1086 case LLC_OPT_PKTINFO:
1088 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1090 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1103 * llc_ui_getsockopt - get connection specific socket info
1104 * @sock: Socket to get information from.
1105 * @level: Socket level user is requesting operations on.
1106 * @optname: Operation name.
1107 * @optval: Variable to return operation data in.
1108 * @optlen: Length of optval.
1110 * Get connection specific socket information.
1112 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1113 char __user *optval, int __user *optlen)
1115 struct sock *sk = sock->sk;
1116 struct llc_sock *llc = llc_sk(sk);
1117 int val = 0, len = 0, rc = -EINVAL;
1120 if (unlikely(level != SOL_LLC))
1122 rc = get_user(len, optlen);
1126 if (len != sizeof(int))
1130 val = llc->n2; break;
1132 val = llc->n1; break;
1133 case LLC_OPT_ACK_TMR_EXP:
1134 val = llc->ack_timer.expire / HZ; break;
1135 case LLC_OPT_P_TMR_EXP:
1136 val = llc->pf_cycle_timer.expire / HZ; break;
1137 case LLC_OPT_REJ_TMR_EXP:
1138 val = llc->rej_sent_timer.expire / HZ; break;
1139 case LLC_OPT_BUSY_TMR_EXP:
1140 val = llc->busy_state_timer.expire / HZ; break;
1141 case LLC_OPT_TX_WIN:
1142 val = llc->k; break;
1143 case LLC_OPT_RX_WIN:
1144 val = llc->rw; break;
1145 case LLC_OPT_PKTINFO:
1146 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1153 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1160 static const struct net_proto_family llc_ui_family_ops = {
1162 .create = llc_ui_create,
1163 .owner = THIS_MODULE,
1166 static const struct proto_ops llc_ui_ops = {
1168 .owner = THIS_MODULE,
1169 .release = llc_ui_release,
1170 .bind = llc_ui_bind,
1171 .connect = llc_ui_connect,
1172 .socketpair = sock_no_socketpair,
1173 .accept = llc_ui_accept,
1174 .getname = llc_ui_getname,
1175 .poll = datagram_poll,
1176 .ioctl = llc_ui_ioctl,
1177 .listen = llc_ui_listen,
1178 .shutdown = llc_ui_shutdown,
1179 .setsockopt = llc_ui_setsockopt,
1180 .getsockopt = llc_ui_getsockopt,
1181 .sendmsg = llc_ui_sendmsg,
1182 .recvmsg = llc_ui_recvmsg,
1183 .mmap = sock_no_mmap,
1184 .sendpage = sock_no_sendpage,
1187 static const char llc_proc_err_msg[] __initconst =
1188 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1189 static const char llc_sysctl_err_msg[] __initconst =
1190 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1191 static const char llc_sock_err_msg[] __initconst =
1192 KERN_CRIT "LLC: Unable to register the network family\n";
1194 static int __init llc2_init(void)
1196 int rc = proto_register(&llc_proto, 0);
1201 llc_build_offset_table();
1203 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1204 rc = llc_proc_init();
1206 printk(llc_proc_err_msg);
1207 goto out_unregister_llc_proto;
1209 rc = llc_sysctl_init();
1211 printk(llc_sysctl_err_msg);
1214 rc = sock_register(&llc_ui_family_ops);
1216 printk(llc_sock_err_msg);
1219 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1220 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1227 out_unregister_llc_proto:
1228 proto_unregister(&llc_proto);
1232 static void __exit llc2_exit(void)
1235 llc_remove_pack(LLC_DEST_SAP);
1236 llc_remove_pack(LLC_DEST_CONN);
1237 sock_unregister(PF_LLC);
1240 proto_unregister(&llc_proto);
1243 module_init(llc2_init);
1244 module_exit(llc2_exit);
1246 MODULE_LICENSE("GPL");
1247 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1248 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1249 MODULE_ALIAS_NETPROTO(PF_LLC);