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>
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 const 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_busy_core(struct sock *sk, long timeout);
45 #define dprintk(args...) printk(KERN_DEBUG args)
47 #define dprintk(args...)
50 /* Maybe we'll add some more in the future. */
51 #define LLC_CMSG_PKTINFO 1
55 * llc_ui_next_link_no - return the next unused link number for a sap
56 * @sap: Address of sap to get link number from.
58 * Return the next unused link number for a given sap.
60 static inline u16 llc_ui_next_link_no(int sap)
62 return llc_ui_sap_link_no_max[sap]++;
66 * llc_proto_type - return eth protocol for ARP header type
67 * @arphrd: ARP header type.
69 * Given an ARP header type return the corresponding ethernet protocol.
71 static inline __be16 llc_proto_type(u16 arphrd)
73 return arphrd == ARPHRD_IEEE802_TR ?
74 htons(ETH_P_TR_802_2) : htons(ETH_P_802_2);
78 * llc_ui_addr_null - determines if a address structure is null
79 * @addr: Address to test if null.
81 static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
83 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
87 * llc_ui_header_len - return length of llc header based on operation
88 * @sk: Socket which contains a valid llc socket type.
89 * @addr: Complete sockaddr_llc structure received from the user.
91 * Provide the length of the llc header depending on what kind of
92 * operation the user would like to perform and the type of socket.
93 * Returns the correct llc header length.
95 static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
97 u8 rc = LLC_PDU_LEN_U;
99 if (addr->sllc_test || addr->sllc_xid)
101 else if (sk->sk_type == SOCK_STREAM)
107 * llc_ui_send_data - send data via reliable llc2 connection
108 * @sk: Connection the socket is using.
109 * @skb: Data the user wishes to send.
110 * @noblock: can we block waiting for data?
112 * Send data via reliable llc2 connection.
113 * Returns 0 upon success, non-zero if action did not succeed.
115 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
117 struct llc_sock* llc = llc_sk(sk);
120 if (unlikely(llc_data_accept_state(llc->state) ||
121 llc->remote_busy_flag ||
123 long timeout = sock_sndtimeo(sk, noblock);
125 rc = llc_ui_wait_for_busy_core(sk, timeout);
128 rc = llc_build_and_send_pkt(sk, skb);
132 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
134 sock_graft(sk, sock);
135 sk->sk_type = sock->type;
136 sock->ops = &llc_ui_ops;
139 static struct proto llc_proto = {
141 .owner = THIS_MODULE,
142 .obj_size = sizeof(struct llc_sock),
143 .slab_flags = SLAB_DESTROY_BY_RCU,
147 * llc_ui_create - alloc and init a new llc_ui socket
148 * @net: network namespace (must be default network)
149 * @sock: Socket to initialize and attach allocated sk to.
151 * @kern: on behalf of kernel or userspace
153 * Allocate and initialize a new llc_ui socket, validate the user wants a
154 * socket type we have available.
155 * Returns 0 upon success, negative upon failure.
157 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
161 int rc = -ESOCKTNOSUPPORT;
163 if (!capable(CAP_NET_RAW))
166 if (!net_eq(net, &init_net))
167 return -EAFNOSUPPORT;
169 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
171 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto);
174 llc_ui_sk_init(sock, sk);
181 * llc_ui_release - shutdown socket
182 * @sock: Socket to release.
184 * Shutdown and deallocate an existing socket.
186 static int llc_ui_release(struct socket *sock)
188 struct sock *sk = sock->sk;
189 struct llc_sock *llc;
191 if (unlikely(sk == NULL))
196 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
197 llc->laddr.lsap, llc->daddr.lsap);
198 if (!llc_send_disc(sk))
199 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
200 if (!sock_flag(sk, SOCK_ZAPPED)) {
201 llc_sap_put(llc->sap);
202 llc_sap_remove_socket(llc->sap, sk);
214 * llc_ui_autoport - provide dynamically allocate SAP number
216 * Provide the caller with a dynamically allocated SAP number according
217 * to the rules that are set in this function. Returns: 0, upon failure,
218 * SAP number otherwise.
220 static int llc_ui_autoport(void)
225 while (tries < LLC_SAP_DYN_TRIES) {
226 for (i = llc_ui_sap_last_autoport;
227 i < LLC_SAP_DYN_STOP; i += 2) {
228 sap = llc_sap_find(i);
230 llc_ui_sap_last_autoport = i + 2;
235 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
244 * llc_ui_autobind - automatically bind a socket to a sap
245 * @sock: socket to bind
246 * @addr: address to connect to
248 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
249 * specifically used llc_ui_bind to bind to an specific address/sap
251 * Returns: 0 upon success, negative otherwise.
253 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
255 struct sock *sk = sock->sk;
256 struct llc_sock *llc = llc_sk(sk);
260 if (!sock_flag(sk, SOCK_ZAPPED))
263 if (sk->sk_bound_dev_if) {
264 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
265 if (llc->dev && addr->sllc_arphrd != llc->dev->type) {
270 llc->dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
274 llc->laddr.lsap = llc_ui_autoport();
275 if (!llc->laddr.lsap)
277 rc = -EBUSY; /* some other network layer is using the sap */
278 sap = llc_sap_open(llc->laddr.lsap, NULL);
281 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
282 memcpy(&llc->addr, addr, sizeof(llc->addr));
283 /* assign new connection to its SAP */
284 llc_sap_add_socket(sap, sk);
285 sock_reset_flag(sk, SOCK_ZAPPED);
292 * llc_ui_bind - bind a socket to a specific address.
293 * @sock: Socket to bind an address to.
294 * @uaddr: Address the user wants the socket bound to.
295 * @addrlen: Length of the uaddr structure.
297 * Bind a socket to a specific address. For llc a user is able to bind to
298 * a specific sap only or mac + sap.
299 * If the user desires to bind to a specific mac + sap, it is possible to
300 * have multiple sap connections via multiple macs.
301 * Bind and autobind for that matter must enforce the correct sap usage
302 * otherwise all hell will break loose.
303 * Returns: 0 upon success, negative otherwise.
305 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
307 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
308 struct sock *sk = sock->sk;
309 struct llc_sock *llc = llc_sk(sk);
313 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
314 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
317 if (unlikely(addr->sllc_family != AF_LLC))
321 if (sk->sk_bound_dev_if) {
322 llc->dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
324 if (!addr->sllc_arphrd)
325 addr->sllc_arphrd = llc->dev->type;
326 if (llc_mac_null(addr->sllc_mac))
327 memcpy(addr->sllc_mac, llc->dev->dev_addr,
329 if (addr->sllc_arphrd != llc->dev->type ||
330 !llc_mac_match(addr->sllc_mac,
331 llc->dev->dev_addr)) {
338 llc->dev = dev_getbyhwaddr(&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 */
357 struct llc_addr laddr, daddr;
360 memset(&laddr, 0, sizeof(laddr));
361 memset(&daddr, 0, sizeof(daddr));
363 * FIXME: check if the address is multicast,
364 * only SOCK_DGRAM can do this.
366 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
367 laddr.lsap = addr->sllc_sap;
368 rc = -EADDRINUSE; /* mac + sap clash. */
369 ask = llc_lookup_established(sap, &daddr, &laddr);
375 llc->laddr.lsap = addr->sllc_sap;
376 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
377 memcpy(&llc->addr, addr, sizeof(llc->addr));
378 /* assign new connection to its SAP */
379 llc_sap_add_socket(sap, sk);
380 sock_reset_flag(sk, SOCK_ZAPPED);
389 * llc_ui_shutdown - shutdown a connect llc2 socket.
390 * @sock: Socket to shutdown.
391 * @how: What part of the socket to shutdown.
393 * Shutdown a connected llc2 socket. Currently this function only supports
394 * shutting down both sends and receives (2), we could probably make this
395 * function such that a user can shutdown only half the connection but not
397 * Returns: 0 upon success, negative otherwise.
399 static int llc_ui_shutdown(struct socket *sock, int how)
401 struct sock *sk = sock->sk;
405 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
410 rc = llc_send_disc(sk);
412 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
413 /* Wake up anyone sleeping in poll */
414 sk->sk_state_change(sk);
421 * llc_ui_connect - Connect to a remote llc2 mac + sap.
422 * @sock: Socket which will be connected to the remote destination.
423 * @uaddr: Remote and possibly the local address of the new connection.
424 * @addrlen: Size of uaddr structure.
425 * @flags: Operational flags specified by the user.
427 * Connect to a remote llc2 mac + sap. The caller must specify the
428 * destination mac and address to connect to. If the user hasn't previously
429 * called bind(2) with a smac the address of the first interface of the
430 * specified arp type will be used.
431 * This function will autobind if user did not previously call bind.
432 * Returns: 0 upon success, negative otherwise.
434 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
435 int addrlen, int flags)
437 struct sock *sk = sock->sk;
438 struct llc_sock *llc = llc_sk(sk);
439 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
443 if (unlikely(addrlen != sizeof(*addr)))
446 if (unlikely(addr->sllc_family != AF_LLC))
448 if (unlikely(sk->sk_type != SOCK_STREAM))
451 if (unlikely(sock->state == SS_CONNECTING))
453 /* bind connection to sap if user hasn't done it. */
454 if (sock_flag(sk, SOCK_ZAPPED)) {
455 /* bind to sap with null dev, exclusive */
456 rc = llc_ui_autobind(sock, addr);
460 llc->daddr.lsap = addr->sllc_sap;
461 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
462 sock->state = SS_CONNECTING;
463 sk->sk_state = TCP_SYN_SENT;
464 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
465 rc = llc_establish_connection(sk, llc->dev->dev_addr,
466 addr->sllc_mac, addr->sllc_sap);
468 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
469 sock->state = SS_UNCONNECTED;
470 sk->sk_state = TCP_CLOSE;
474 if (sk->sk_state == TCP_SYN_SENT) {
475 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
477 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
480 rc = sock_intr_errno(timeo);
481 if (signal_pending(current))
485 if (sk->sk_state == TCP_CLOSE)
488 sock->state = SS_CONNECTED;
494 rc = sock_error(sk) ? : -ECONNABORTED;
495 sock->state = SS_UNCONNECTED;
500 * llc_ui_listen - allow a normal socket to accept incoming connections
501 * @sock: Socket to allow incoming connections on.
502 * @backlog: Number of connections to queue.
504 * Allow a normal socket to accept incoming connections.
505 * Returns 0 upon success, negative otherwise.
507 static int llc_ui_listen(struct socket *sock, int backlog)
509 struct sock *sk = sock->sk;
513 if (unlikely(sock->state != SS_UNCONNECTED))
516 if (unlikely(sk->sk_type != SOCK_STREAM))
519 if (sock_flag(sk, SOCK_ZAPPED))
522 if (!(unsigned)backlog) /* BSDism */
524 sk->sk_max_ack_backlog = backlog;
525 if (sk->sk_state != TCP_LISTEN) {
526 sk->sk_ack_backlog = 0;
527 sk->sk_state = TCP_LISTEN;
529 sk->sk_socket->flags |= __SO_ACCEPTCON;
535 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
541 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
542 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE))
545 if (signal_pending(current))
552 finish_wait(sk->sk_sleep, &wait);
556 static int llc_ui_wait_for_conn(struct sock *sk, long timeout)
561 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
562 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT))
564 if (signal_pending(current) || !timeout)
567 finish_wait(sk->sk_sleep, &wait);
571 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
574 struct llc_sock *llc = llc_sk(sk);
578 prepare_to_wait(sk->sk_sleep, &wait, TASK_INTERRUPTIBLE);
580 if (sk_wait_event(sk, &timeout,
581 (sk->sk_shutdown & RCV_SHUTDOWN) ||
582 (!llc_data_accept_state(llc->state) &&
583 !llc->remote_busy_flag &&
587 if (signal_pending(current))
593 finish_wait(sk->sk_sleep, &wait);
597 static int llc_wait_data(struct sock *sk, long timeo)
603 * POSIX 1003.1g mandates this order.
609 if (sk->sk_shutdown & RCV_SHUTDOWN)
614 rc = sock_intr_errno(timeo);
615 if (signal_pending(current))
618 if (sk_wait_data(sk, &timeo))
624 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
626 struct llc_sock *llc = llc_sk(skb->sk);
628 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
629 struct llc_pktinfo 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;
817 /* Ok so how much can we use? */
818 used = skb->len - offset;
822 if (!(flags & MSG_TRUNC)) {
823 int rc = skb_copy_datagram_iovec(skb, offset,
826 /* Exception. Bailout! */
837 if (!(flags & MSG_PEEK)) {
838 sk_eat_skb(sk, skb, 0);
842 /* For non stream protcols we get one packet per recvmsg call */
843 if (sk->sk_type != SOCK_STREAM)
847 if (used + offset < skb->len)
855 if (uaddr != NULL && skb != NULL) {
856 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
857 msg->msg_namelen = sizeof(*uaddr);
859 if (llc_sk(sk)->cmsg_flags)
860 llc_cmsg_rcv(msg, skb);
865 * llc_ui_sendmsg - Transmit data provided by the socket user.
866 * @sock: Socket to transmit data from.
867 * @msg: Various user related information.
868 * @len: Length of data to transmit.
870 * Transmit data provided by the socket user.
871 * Returns non-negative upon success, negative otherwise.
873 static int llc_ui_sendmsg(struct kiocb *iocb, struct socket *sock,
874 struct msghdr *msg, size_t len)
876 struct sock *sk = sock->sk;
877 struct llc_sock *llc = llc_sk(sk);
878 struct sockaddr_llc *addr = (struct sockaddr_llc *)msg->msg_name;
879 int flags = msg->msg_flags;
880 int noblock = flags & MSG_DONTWAIT;
883 int rc = -EINVAL, copied = 0, hdrlen;
885 dprintk("%s: sending from %02X to %02X\n", __func__,
886 llc->laddr.lsap, llc->daddr.lsap);
889 if (msg->msg_namelen < sizeof(*addr))
892 if (llc_ui_addr_null(&llc->addr))
896 /* must bind connection to sap if user hasn't done it. */
897 if (sock_flag(sk, SOCK_ZAPPED)) {
898 /* bind to sap with null dev, exclusive. */
899 rc = llc_ui_autobind(sock, addr);
903 hdrlen = llc->dev->hard_header_len + llc_ui_header_len(sk, addr);
905 if (size > llc->dev->mtu)
906 size = llc->dev->mtu;
907 copied = size - hdrlen;
909 skb = sock_alloc_send_skb(sk, size, noblock, &rc);
914 skb->protocol = llc_proto_type(addr->sllc_arphrd);
915 skb_reserve(skb, hdrlen);
916 rc = memcpy_fromiovec(skb_put(skb, copied), msg->msg_iov, copied);
919 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
920 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
924 if (addr->sllc_test) {
925 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
929 if (addr->sllc_xid) {
930 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
935 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
937 rc = llc_ui_send_data(sk, skb, noblock);
942 dprintk("%s: failed sending from %02X to %02X: %d\n",
943 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
946 return rc ? : copied;
950 * llc_ui_getname - return the address info of a socket
951 * @sock: Socket to get address of.
952 * @uaddr: Address structure to return information.
953 * @uaddrlen: Length of address structure.
954 * @peer: Does user want local or remote address information.
956 * Return the address information of a socket.
958 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
959 int *uaddrlen, int peer)
961 struct sockaddr_llc sllc;
962 struct sock *sk = sock->sk;
963 struct llc_sock *llc = llc_sk(sk);
966 memset(&sllc, 0, sizeof(sllc));
968 if (sock_flag(sk, SOCK_ZAPPED))
970 *uaddrlen = sizeof(sllc);
971 memset(uaddr, 0, *uaddrlen);
974 if (sk->sk_state != TCP_ESTABLISHED)
977 sllc.sllc_arphrd = llc->dev->type;
978 sllc.sllc_sap = llc->daddr.lsap;
979 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
984 sllc.sllc_sap = llc->sap->laddr.lsap;
987 sllc.sllc_arphrd = llc->dev->type;
988 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
993 sllc.sllc_family = AF_LLC;
994 memcpy(uaddr, &sllc, sizeof(sllc));
1001 * llc_ui_ioctl - io controls for PF_LLC
1002 * @sock: Socket to get/set info
1004 * @arg: optional argument for cmd
1006 * get/set info on llc sockets
1008 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1011 return -ENOIOCTLCMD;
1015 * llc_ui_setsockopt - set various connection specific parameters.
1016 * @sock: Socket to set options on.
1017 * @level: Socket level user is requesting operations on.
1018 * @optname: Operation name.
1019 * @optval User provided operation data.
1020 * @optlen: Length of optval.
1022 * Set various connection specific parameters.
1024 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1025 char __user *optval, unsigned int optlen)
1027 struct sock *sk = sock->sk;
1028 struct llc_sock *llc = llc_sk(sk);
1029 int rc = -EINVAL, opt;
1032 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1034 rc = get_user(opt, (int __user *)optval);
1040 if (opt > LLC_OPT_MAX_RETRY)
1045 if (opt > LLC_OPT_MAX_SIZE)
1049 case LLC_OPT_ACK_TMR_EXP:
1050 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1052 llc->ack_timer.expire = opt * HZ;
1054 case LLC_OPT_P_TMR_EXP:
1055 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1057 llc->pf_cycle_timer.expire = opt * HZ;
1059 case LLC_OPT_REJ_TMR_EXP:
1060 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1062 llc->rej_sent_timer.expire = opt * HZ;
1064 case LLC_OPT_BUSY_TMR_EXP:
1065 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1067 llc->busy_state_timer.expire = opt * HZ;
1069 case LLC_OPT_TX_WIN:
1070 if (opt > LLC_OPT_MAX_WIN)
1074 case LLC_OPT_RX_WIN:
1075 if (opt > LLC_OPT_MAX_WIN)
1079 case LLC_OPT_PKTINFO:
1081 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1083 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1096 * llc_ui_getsockopt - get connection specific socket info
1097 * @sock: Socket to get information from.
1098 * @level: Socket level user is requesting operations on.
1099 * @optname: Operation name.
1100 * @optval: Variable to return operation data in.
1101 * @optlen: Length of optval.
1103 * Get connection specific socket information.
1105 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1106 char __user *optval, int __user *optlen)
1108 struct sock *sk = sock->sk;
1109 struct llc_sock *llc = llc_sk(sk);
1110 int val = 0, len = 0, rc = -EINVAL;
1113 if (unlikely(level != SOL_LLC))
1115 rc = get_user(len, optlen);
1119 if (len != sizeof(int))
1123 val = llc->n2; break;
1125 val = llc->n1; break;
1126 case LLC_OPT_ACK_TMR_EXP:
1127 val = llc->ack_timer.expire / HZ; break;
1128 case LLC_OPT_P_TMR_EXP:
1129 val = llc->pf_cycle_timer.expire / HZ; break;
1130 case LLC_OPT_REJ_TMR_EXP:
1131 val = llc->rej_sent_timer.expire / HZ; break;
1132 case LLC_OPT_BUSY_TMR_EXP:
1133 val = llc->busy_state_timer.expire / HZ; break;
1134 case LLC_OPT_TX_WIN:
1135 val = llc->k; break;
1136 case LLC_OPT_RX_WIN:
1137 val = llc->rw; break;
1138 case LLC_OPT_PKTINFO:
1139 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1146 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1153 static const struct net_proto_family llc_ui_family_ops = {
1155 .create = llc_ui_create,
1156 .owner = THIS_MODULE,
1159 static const struct proto_ops llc_ui_ops = {
1161 .owner = THIS_MODULE,
1162 .release = llc_ui_release,
1163 .bind = llc_ui_bind,
1164 .connect = llc_ui_connect,
1165 .socketpair = sock_no_socketpair,
1166 .accept = llc_ui_accept,
1167 .getname = llc_ui_getname,
1168 .poll = datagram_poll,
1169 .ioctl = llc_ui_ioctl,
1170 .listen = llc_ui_listen,
1171 .shutdown = llc_ui_shutdown,
1172 .setsockopt = llc_ui_setsockopt,
1173 .getsockopt = llc_ui_getsockopt,
1174 .sendmsg = llc_ui_sendmsg,
1175 .recvmsg = llc_ui_recvmsg,
1176 .mmap = sock_no_mmap,
1177 .sendpage = sock_no_sendpage,
1180 static const char llc_proc_err_msg[] __initconst =
1181 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1182 static const char llc_sysctl_err_msg[] __initconst =
1183 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1184 static const char llc_sock_err_msg[] __initconst =
1185 KERN_CRIT "LLC: Unable to register the network family\n";
1187 static int __init llc2_init(void)
1189 int rc = proto_register(&llc_proto, 0);
1194 llc_build_offset_table();
1196 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1197 rc = llc_proc_init();
1199 printk(llc_proc_err_msg);
1200 goto out_unregister_llc_proto;
1202 rc = llc_sysctl_init();
1204 printk(llc_sysctl_err_msg);
1207 rc = sock_register(&llc_ui_family_ops);
1209 printk(llc_sock_err_msg);
1212 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1213 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1220 out_unregister_llc_proto:
1221 proto_unregister(&llc_proto);
1225 static void __exit llc2_exit(void)
1228 llc_remove_pack(LLC_DEST_SAP);
1229 llc_remove_pack(LLC_DEST_CONN);
1230 sock_unregister(PF_LLC);
1233 proto_unregister(&llc_proto);
1236 module_init(llc2_init);
1237 module_exit(llc2_exit);
1239 MODULE_LICENSE("GPL");
1240 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1241 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1242 MODULE_ALIAS_NETPROTO(PF_LLC);