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>
29 #include <linux/sched/signal.h>
32 #include <net/llc_sap.h>
33 #include <net/llc_pdu.h>
34 #include <net/llc_conn.h>
35 #include <net/tcp_states.h>
37 /* remember: uninitialized global data is zeroed because its in .bss */
38 static u16 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
39 static u16 llc_ui_sap_link_no_max[256];
40 static struct sockaddr_llc llc_ui_addrnull;
41 static const struct proto_ops llc_ui_ops;
43 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout);
44 static int llc_ui_wait_for_disc(struct sock *sk, long timeout);
45 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout);
48 #define dprintk(args...) printk(KERN_DEBUG args)
50 #define dprintk(args...)
53 /* Maybe we'll add some more in the future. */
54 #define LLC_CMSG_PKTINFO 1
58 * llc_ui_next_link_no - return the next unused link number for a sap
59 * @sap: Address of sap to get link number from.
61 * Return the next unused link number for a given sap.
63 static inline u16 llc_ui_next_link_no(int sap)
65 return llc_ui_sap_link_no_max[sap]++;
69 * llc_proto_type - return eth protocol for ARP header type
70 * @arphrd: ARP header type.
72 * Given an ARP header type return the corresponding ethernet protocol.
74 static inline __be16 llc_proto_type(u16 arphrd)
76 return htons(ETH_P_802_2);
80 * llc_ui_addr_null - determines if a address structure is null
81 * @addr: Address to test if null.
83 static inline u8 llc_ui_addr_null(struct sockaddr_llc *addr)
85 return !memcmp(addr, &llc_ui_addrnull, sizeof(*addr));
89 * llc_ui_header_len - return length of llc header based on operation
90 * @sk: Socket which contains a valid llc socket type.
91 * @addr: Complete sockaddr_llc structure received from the user.
93 * Provide the length of the llc header depending on what kind of
94 * operation the user would like to perform and the type of socket.
95 * Returns the correct llc header length.
97 static inline u8 llc_ui_header_len(struct sock *sk, struct sockaddr_llc *addr)
99 u8 rc = LLC_PDU_LEN_U;
103 else if (addr->sllc_xid)
104 /* We need to expand header to sizeof(struct llc_xid_info)
105 * since llc_pdu_init_as_xid_cmd() sets 4,5,6 bytes of LLC header
106 * as XID PDU. In llc_ui_sendmsg() we reserved header size and then
107 * filled all other space with user data. If we won't reserve this
108 * bytes, llc_pdu_init_as_xid_cmd() will overwrite user data
110 rc = LLC_PDU_LEN_U_XID;
111 else if (sk->sk_type == SOCK_STREAM)
117 * llc_ui_send_data - send data via reliable llc2 connection
118 * @sk: Connection the socket is using.
119 * @skb: Data the user wishes to send.
120 * @noblock: can we block waiting for data?
122 * Send data via reliable llc2 connection.
123 * Returns 0 upon success, non-zero if action did not succeed.
125 * This function always consumes a reference to the skb.
127 static int llc_ui_send_data(struct sock* sk, struct sk_buff *skb, int noblock)
129 struct llc_sock* llc = llc_sk(sk);
131 if (unlikely(llc_data_accept_state(llc->state) ||
132 llc->remote_busy_flag ||
134 long timeout = sock_sndtimeo(sk, noblock);
137 rc = llc_ui_wait_for_busy_core(sk, timeout);
143 return llc_build_and_send_pkt(sk, skb);
146 static void llc_ui_sk_init(struct socket *sock, struct sock *sk)
148 sock_graft(sk, sock);
149 sk->sk_type = sock->type;
150 sock->ops = &llc_ui_ops;
153 static struct proto llc_proto = {
155 .owner = THIS_MODULE,
156 .obj_size = sizeof(struct llc_sock),
157 .slab_flags = SLAB_TYPESAFE_BY_RCU,
161 * llc_ui_create - alloc and init a new llc_ui socket
162 * @net: network namespace (must be default network)
163 * @sock: Socket to initialize and attach allocated sk to.
165 * @kern: on behalf of kernel or userspace
167 * Allocate and initialize a new llc_ui socket, validate the user wants a
168 * socket type we have available.
169 * Returns 0 upon success, negative upon failure.
171 static int llc_ui_create(struct net *net, struct socket *sock, int protocol,
175 int rc = -ESOCKTNOSUPPORT;
177 if (!ns_capable(net->user_ns, CAP_NET_RAW))
180 if (!net_eq(net, &init_net))
181 return -EAFNOSUPPORT;
183 if (likely(sock->type == SOCK_DGRAM || sock->type == SOCK_STREAM)) {
185 sk = llc_sk_alloc(net, PF_LLC, GFP_KERNEL, &llc_proto, kern);
188 llc_ui_sk_init(sock, sk);
195 * llc_ui_release - shutdown socket
196 * @sock: Socket to release.
198 * Shutdown and deallocate an existing socket.
200 static int llc_ui_release(struct socket *sock)
202 struct sock *sk = sock->sk;
203 struct llc_sock *llc;
205 if (unlikely(sk == NULL))
210 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__,
211 llc->laddr.lsap, llc->daddr.lsap);
212 if (!llc_send_disc(sk))
213 llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
214 if (!sock_flag(sk, SOCK_ZAPPED)) {
215 struct llc_sap *sap = llc->sap;
217 /* Hold this for release_sock(), so that llc_backlog_rcv()
218 * could still use it.
221 llc_sap_remove_socket(llc->sap, sk);
238 * llc_ui_autoport - provide dynamically allocate SAP number
240 * Provide the caller with a dynamically allocated SAP number according
241 * to the rules that are set in this function. Returns: 0, upon failure,
242 * SAP number otherwise.
244 static int llc_ui_autoport(void)
249 while (tries < LLC_SAP_DYN_TRIES) {
250 for (i = llc_ui_sap_last_autoport;
251 i < LLC_SAP_DYN_STOP; i += 2) {
252 sap = llc_sap_find(i);
254 llc_ui_sap_last_autoport = i + 2;
259 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
268 * llc_ui_autobind - automatically bind a socket to a sap
269 * @sock: socket to bind
270 * @addr: address to connect to
272 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
273 * specifically used llc_ui_bind to bind to an specific address/sap
275 * Returns: 0 upon success, negative otherwise.
277 static int llc_ui_autobind(struct socket *sock, struct sockaddr_llc *addr)
279 struct sock *sk = sock->sk;
280 struct llc_sock *llc = llc_sk(sk);
281 struct net_device *dev = NULL;
285 if (!sock_flag(sk, SOCK_ZAPPED))
287 if (!addr->sllc_arphrd)
288 addr->sllc_arphrd = ARPHRD_ETHER;
289 if (addr->sllc_arphrd != ARPHRD_ETHER)
292 if (sk->sk_bound_dev_if) {
293 dev = dev_get_by_index(&init_net, sk->sk_bound_dev_if);
294 if (dev && addr->sllc_arphrd != dev->type) {
299 dev = dev_getfirstbyhwtype(&init_net, addr->sllc_arphrd);
303 llc->laddr.lsap = llc_ui_autoport();
304 if (!llc->laddr.lsap)
306 rc = -EBUSY; /* some other network layer is using the sap */
307 sap = llc_sap_open(llc->laddr.lsap, NULL);
311 /* Note: We do not expect errors from this point. */
315 memcpy(llc->laddr.mac, llc->dev->dev_addr, IFHWADDRLEN);
316 memcpy(&llc->addr, addr, sizeof(llc->addr));
317 /* assign new connection to its SAP */
318 llc_sap_add_socket(sap, sk);
319 sock_reset_flag(sk, SOCK_ZAPPED);
327 * llc_ui_bind - bind a socket to a specific address.
328 * @sock: Socket to bind an address to.
329 * @uaddr: Address the user wants the socket bound to.
330 * @addrlen: Length of the uaddr structure.
332 * Bind a socket to a specific address. For llc a user is able to bind to
333 * a specific sap only or mac + sap.
334 * If the user desires to bind to a specific mac + sap, it is possible to
335 * have multiple sap connections via multiple macs.
336 * Bind and autobind for that matter must enforce the correct sap usage
337 * otherwise all hell will break loose.
338 * Returns: 0 upon success, negative otherwise.
340 static int llc_ui_bind(struct socket *sock, struct sockaddr *uaddr, int addrlen)
342 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
343 struct sock *sk = sock->sk;
344 struct llc_sock *llc = llc_sk(sk);
345 struct net_device *dev = NULL;
349 dprintk("%s: binding %02X\n", __func__, addr->sllc_sap);
352 if (unlikely(!sock_flag(sk, SOCK_ZAPPED) || addrlen != sizeof(*addr)))
355 if (!addr->sllc_arphrd)
356 addr->sllc_arphrd = ARPHRD_ETHER;
357 if (unlikely(addr->sllc_family != AF_LLC || addr->sllc_arphrd != ARPHRD_ETHER))
361 if (sk->sk_bound_dev_if) {
362 dev = dev_get_by_index_rcu(&init_net, sk->sk_bound_dev_if);
364 if (is_zero_ether_addr(addr->sllc_mac))
365 memcpy(addr->sllc_mac, dev->dev_addr,
367 if (addr->sllc_arphrd != dev->type ||
368 !ether_addr_equal(addr->sllc_mac,
375 dev = dev_getbyhwaddr_rcu(&init_net, addr->sllc_arphrd,
383 if (!addr->sllc_sap) {
385 addr->sllc_sap = llc_ui_autoport();
389 sap = llc_sap_find(addr->sllc_sap);
391 sap = llc_sap_open(addr->sllc_sap, NULL);
392 rc = -EBUSY; /* some other network layer is using the sap */
396 struct llc_addr laddr, daddr;
399 memset(&laddr, 0, sizeof(laddr));
400 memset(&daddr, 0, sizeof(daddr));
402 * FIXME: check if the address is multicast,
403 * only SOCK_DGRAM can do this.
405 memcpy(laddr.mac, addr->sllc_mac, IFHWADDRLEN);
406 laddr.lsap = addr->sllc_sap;
407 rc = -EADDRINUSE; /* mac + sap clash. */
408 ask = llc_lookup_established(sap, &daddr, &laddr);
415 /* Note: We do not expect errors from this point. */
419 llc->laddr.lsap = addr->sllc_sap;
420 memcpy(llc->laddr.mac, addr->sllc_mac, IFHWADDRLEN);
421 memcpy(&llc->addr, addr, sizeof(llc->addr));
422 /* assign new connection to its SAP */
423 llc_sap_add_socket(sap, sk);
424 sock_reset_flag(sk, SOCK_ZAPPED);
435 * llc_ui_shutdown - shutdown a connect llc2 socket.
436 * @sock: Socket to shutdown.
437 * @how: What part of the socket to shutdown.
439 * Shutdown a connected llc2 socket. Currently this function only supports
440 * shutting down both sends and receives (2), we could probably make this
441 * function such that a user can shutdown only half the connection but not
443 * Returns: 0 upon success, negative otherwise.
445 static int llc_ui_shutdown(struct socket *sock, int how)
447 struct sock *sk = sock->sk;
451 if (unlikely(sk->sk_state != TCP_ESTABLISHED))
456 rc = llc_send_disc(sk);
458 rc = llc_ui_wait_for_disc(sk, sk->sk_rcvtimeo);
459 /* Wake up anyone sleeping in poll */
460 sk->sk_state_change(sk);
467 * llc_ui_connect - Connect to a remote llc2 mac + sap.
468 * @sock: Socket which will be connected to the remote destination.
469 * @uaddr: Remote and possibly the local address of the new connection.
470 * @addrlen: Size of uaddr structure.
471 * @flags: Operational flags specified by the user.
473 * Connect to a remote llc2 mac + sap. The caller must specify the
474 * destination mac and address to connect to. If the user hasn't previously
475 * called bind(2) with a smac the address of the first interface of the
476 * specified arp type will be used.
477 * This function will autobind if user did not previously call bind.
478 * Returns: 0 upon success, negative otherwise.
480 static int llc_ui_connect(struct socket *sock, struct sockaddr *uaddr,
481 int addrlen, int flags)
483 struct sock *sk = sock->sk;
484 struct llc_sock *llc = llc_sk(sk);
485 struct sockaddr_llc *addr = (struct sockaddr_llc *)uaddr;
489 if (unlikely(addrlen != sizeof(*addr)))
492 if (unlikely(addr->sllc_family != AF_LLC))
494 if (unlikely(sk->sk_type != SOCK_STREAM))
497 if (unlikely(sock->state == SS_CONNECTING))
499 /* bind connection to sap if user hasn't done it. */
500 if (sock_flag(sk, SOCK_ZAPPED)) {
501 /* bind to sap with null dev, exclusive */
502 rc = llc_ui_autobind(sock, addr);
506 llc->daddr.lsap = addr->sllc_sap;
507 memcpy(llc->daddr.mac, addr->sllc_mac, IFHWADDRLEN);
508 sock->state = SS_CONNECTING;
509 sk->sk_state = TCP_SYN_SENT;
510 llc->link = llc_ui_next_link_no(llc->sap->laddr.lsap);
511 rc = llc_establish_connection(sk, llc->dev->dev_addr,
512 addr->sllc_mac, addr->sllc_sap);
514 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__);
515 sock->state = SS_UNCONNECTED;
516 sk->sk_state = TCP_CLOSE;
520 if (sk->sk_state == TCP_SYN_SENT) {
521 const long timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
523 if (!timeo || !llc_ui_wait_for_conn(sk, timeo))
526 rc = sock_intr_errno(timeo);
527 if (signal_pending(current))
531 if (sk->sk_state == TCP_CLOSE)
534 sock->state = SS_CONNECTED;
540 rc = sock_error(sk) ? : -ECONNABORTED;
541 sock->state = SS_UNCONNECTED;
546 * llc_ui_listen - allow a normal socket to accept incoming connections
547 * @sock: Socket to allow incoming connections on.
548 * @backlog: Number of connections to queue.
550 * Allow a normal socket to accept incoming connections.
551 * Returns 0 upon success, negative otherwise.
553 static int llc_ui_listen(struct socket *sock, int backlog)
555 struct sock *sk = sock->sk;
559 if (unlikely(sock->state != SS_UNCONNECTED))
562 if (unlikely(sk->sk_type != SOCK_STREAM))
565 if (sock_flag(sk, SOCK_ZAPPED))
568 if (!(unsigned int)backlog) /* BSDism */
570 sk->sk_max_ack_backlog = backlog;
571 if (sk->sk_state != TCP_LISTEN) {
572 sk->sk_ack_backlog = 0;
573 sk->sk_state = TCP_LISTEN;
575 sk->sk_socket->flags |= __SO_ACCEPTCON;
581 static int llc_ui_wait_for_disc(struct sock *sk, long timeout)
583 DEFINE_WAIT_FUNC(wait, woken_wake_function);
586 add_wait_queue(sk_sleep(sk), &wait);
588 if (sk_wait_event(sk, &timeout, sk->sk_state == TCP_CLOSE, &wait))
591 if (signal_pending(current))
598 remove_wait_queue(sk_sleep(sk), &wait);
602 static bool llc_ui_wait_for_conn(struct sock *sk, long timeout)
604 DEFINE_WAIT_FUNC(wait, woken_wake_function);
606 add_wait_queue(sk_sleep(sk), &wait);
608 if (sk_wait_event(sk, &timeout, sk->sk_state != TCP_SYN_SENT, &wait))
610 if (signal_pending(current) || !timeout)
613 remove_wait_queue(sk_sleep(sk), &wait);
617 static int llc_ui_wait_for_busy_core(struct sock *sk, long timeout)
619 DEFINE_WAIT_FUNC(wait, woken_wake_function);
620 struct llc_sock *llc = llc_sk(sk);
623 add_wait_queue(sk_sleep(sk), &wait);
626 if (sk_wait_event(sk, &timeout,
627 (sk->sk_shutdown & RCV_SHUTDOWN) ||
628 (!llc_data_accept_state(llc->state) &&
629 !llc->remote_busy_flag &&
630 !llc->p_flag), &wait))
633 if (signal_pending(current))
639 remove_wait_queue(sk_sleep(sk), &wait);
643 static int llc_wait_data(struct sock *sk, long timeo)
649 * POSIX 1003.1g mandates this order.
655 if (sk->sk_shutdown & RCV_SHUTDOWN)
660 rc = sock_intr_errno(timeo);
661 if (signal_pending(current))
664 if (sk_wait_data(sk, &timeo, NULL))
670 static void llc_cmsg_rcv(struct msghdr *msg, struct sk_buff *skb)
672 struct llc_sock *llc = llc_sk(skb->sk);
674 if (llc->cmsg_flags & LLC_CMSG_PKTINFO) {
675 struct llc_pktinfo info;
677 memset(&info, 0, sizeof(info));
678 info.lpi_ifindex = llc_sk(skb->sk)->dev->ifindex;
679 llc_pdu_decode_dsap(skb, &info.lpi_sap);
680 llc_pdu_decode_da(skb, info.lpi_mac);
681 put_cmsg(msg, SOL_LLC, LLC_OPT_PKTINFO, sizeof(info), &info);
686 * llc_ui_accept - accept a new incoming connection.
687 * @sock: Socket which connections arrive on.
688 * @newsock: Socket to move incoming connection to.
689 * @flags: User specified operational flags.
690 * @kern: If the socket is kernel internal
692 * Accept a new incoming connection.
693 * Returns 0 upon success, negative otherwise.
695 static int llc_ui_accept(struct socket *sock, struct socket *newsock, int flags,
698 struct sock *sk = sock->sk, *newsk;
699 struct llc_sock *llc, *newllc;
701 int rc = -EOPNOTSUPP;
703 dprintk("%s: accepting on %02X\n", __func__,
704 llc_sk(sk)->laddr.lsap);
706 if (unlikely(sk->sk_type != SOCK_STREAM))
709 if (unlikely(sock->state != SS_UNCONNECTED ||
710 sk->sk_state != TCP_LISTEN))
712 /* wait for a connection to arrive. */
713 if (skb_queue_empty(&sk->sk_receive_queue)) {
714 rc = llc_wait_data(sk, sk->sk_rcvtimeo);
718 dprintk("%s: got a new connection on %02X\n", __func__,
719 llc_sk(sk)->laddr.lsap);
720 skb = skb_dequeue(&sk->sk_receive_queue);
726 /* attach connection to a new socket. */
727 llc_ui_sk_init(newsock, newsk);
728 sock_reset_flag(newsk, SOCK_ZAPPED);
729 newsk->sk_state = TCP_ESTABLISHED;
730 newsock->state = SS_CONNECTED;
732 newllc = llc_sk(newsk);
733 memcpy(&newllc->addr, &llc->addr, sizeof(newllc->addr));
734 newllc->link = llc_ui_next_link_no(newllc->laddr.lsap);
736 /* put original socket back into a clean listen state. */
737 sk->sk_state = TCP_LISTEN;
738 sk->sk_ack_backlog--;
739 dprintk("%s: ok success on %02X, client on %02X\n", __func__,
740 llc_sk(sk)->addr.sllc_sap, newllc->daddr.lsap);
749 * llc_ui_recvmsg - copy received data to the socket user.
750 * @sock: Socket to copy data from.
751 * @msg: Various user space related information.
752 * @len: Size of user buffer.
753 * @flags: User specified flags.
755 * Copy received data to the socket user.
756 * Returns non-negative upon success, negative otherwise.
758 static int llc_ui_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
761 DECLARE_SOCKADDR(struct sockaddr_llc *, uaddr, msg->msg_name);
762 const int nonblock = flags & MSG_DONTWAIT;
763 struct sk_buff *skb = NULL;
764 struct sock *sk = sock->sk;
765 struct llc_sock *llc = llc_sk(sk);
770 int target; /* Read at least this many bytes */
775 if (unlikely(sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_LISTEN))
778 timeo = sock_rcvtimeo(sk, nonblock);
780 seq = &llc->copied_seq;
781 if (flags & MSG_PEEK) {
782 peek_seq = llc->copied_seq;
786 target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
793 * We need to check signals first, to get correct SIGURG
794 * handling. FIXME: Need to check this doesn't impact 1003.1g
795 * and move it down to the bottom of the loop
797 if (signal_pending(current)) {
800 copied = timeo ? sock_intr_errno(timeo) : -EAGAIN;
804 /* Next get a buffer. */
806 skb = skb_peek(&sk->sk_receive_queue);
811 /* Well, if we have backlog, try to process it now yet. */
813 if (copied >= target && !READ_ONCE(sk->sk_backlog.tail))
818 sk->sk_state == TCP_CLOSE ||
819 (sk->sk_shutdown & RCV_SHUTDOWN) ||
824 if (sock_flag(sk, SOCK_DONE))
828 copied = sock_error(sk);
831 if (sk->sk_shutdown & RCV_SHUTDOWN)
834 if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSE) {
835 if (!sock_flag(sk, SOCK_DONE)) {
837 * This occurs when user tries to read
838 * from never connected socket.
851 if (copied >= target) { /* Do not sleep, just process backlog. */
855 sk_wait_data(sk, &timeo, NULL);
857 if ((flags & MSG_PEEK) && peek_seq != llc->copied_seq) {
858 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
860 task_pid_nr(current));
861 peek_seq = llc->copied_seq;
866 /* Ok so how much can we use? */
867 used = skb->len - offset;
871 if (!(flags & MSG_TRUNC)) {
872 int rc = skb_copy_datagram_msg(skb, offset, msg, used);
874 /* Exception. Bailout! */
885 /* For non stream protcols we get one packet per recvmsg call */
886 if (sk->sk_type != SOCK_STREAM)
889 if (!(flags & MSG_PEEK)) {
890 skb_unlink(skb, &sk->sk_receive_queue);
896 if (used + offset < skb_len)
904 if (uaddr != NULL && skb != NULL) {
905 memcpy(uaddr, llc_ui_skb_cb(skb), sizeof(*uaddr));
906 msg->msg_namelen = sizeof(*uaddr);
908 if (llc_sk(sk)->cmsg_flags)
909 llc_cmsg_rcv(msg, skb);
911 if (!(flags & MSG_PEEK)) {
912 skb_unlink(skb, &sk->sk_receive_queue);
921 * llc_ui_sendmsg - Transmit data provided by the socket user.
922 * @sock: Socket to transmit data from.
923 * @msg: Various user related information.
924 * @len: Length of data to transmit.
926 * Transmit data provided by the socket user.
927 * Returns non-negative upon success, negative otherwise.
929 static int llc_ui_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
931 DECLARE_SOCKADDR(struct sockaddr_llc *, addr, msg->msg_name);
932 struct sock *sk = sock->sk;
933 struct llc_sock *llc = llc_sk(sk);
934 int flags = msg->msg_flags;
935 int noblock = flags & MSG_DONTWAIT;
936 int rc = -EINVAL, copied = 0, hdrlen, hh_len;
937 struct sk_buff *skb = NULL;
938 struct net_device *dev;
941 dprintk("%s: sending from %02X to %02X\n", __func__,
942 llc->laddr.lsap, llc->daddr.lsap);
945 if (msg->msg_namelen < sizeof(*addr))
948 if (llc_ui_addr_null(&llc->addr))
952 /* must bind connection to sap if user hasn't done it. */
953 if (sock_flag(sk, SOCK_ZAPPED)) {
954 /* bind to sap with null dev, exclusive. */
955 rc = llc_ui_autobind(sock, addr);
960 hh_len = LL_RESERVED_SPACE(dev);
961 hdrlen = llc_ui_header_len(sk, addr);
963 size = min_t(size_t, size, READ_ONCE(dev->mtu));
964 copied = size - hdrlen;
969 skb = sock_alloc_send_skb(sk, hh_len + size, noblock, &rc);
973 if (sock_flag(sk, SOCK_ZAPPED) ||
975 hdrlen != llc_ui_header_len(sk, addr) ||
976 hh_len != LL_RESERVED_SPACE(dev) ||
977 size > READ_ONCE(dev->mtu))
980 skb->protocol = llc_proto_type(addr->sllc_arphrd);
981 skb_reserve(skb, hh_len + hdrlen);
982 rc = memcpy_from_msg(skb_put(skb, copied), msg, copied);
985 if (sk->sk_type == SOCK_DGRAM || addr->sllc_ua) {
986 llc_build_and_send_ui_pkt(llc->sap, skb, addr->sllc_mac,
991 if (addr->sllc_test) {
992 llc_build_and_send_test_pkt(llc->sap, skb, addr->sllc_mac,
997 if (addr->sllc_xid) {
998 llc_build_and_send_xid_pkt(llc->sap, skb, addr->sllc_mac,
1004 if (!(sk->sk_type == SOCK_STREAM && !addr->sllc_ua))
1006 rc = llc_ui_send_data(sk, skb, noblock);
1011 dprintk("%s: failed sending from %02X to %02X: %d\n",
1012 __func__, llc->laddr.lsap, llc->daddr.lsap, rc);
1014 return rc ? : copied;
1018 * llc_ui_getname - return the address info of a socket
1019 * @sock: Socket to get address of.
1020 * @uaddr: Address structure to return information.
1021 * @uaddrlen: Length of address structure.
1022 * @peer: Does user want local or remote address information.
1024 * Return the address information of a socket.
1026 static int llc_ui_getname(struct socket *sock, struct sockaddr *uaddr,
1029 struct sockaddr_llc sllc;
1030 struct sock *sk = sock->sk;
1031 struct llc_sock *llc = llc_sk(sk);
1034 memset(&sllc, 0, sizeof(sllc));
1036 if (sock_flag(sk, SOCK_ZAPPED))
1040 if (sk->sk_state != TCP_ESTABLISHED)
1043 sllc.sllc_arphrd = llc->dev->type;
1044 sllc.sllc_sap = llc->daddr.lsap;
1045 memcpy(&sllc.sllc_mac, &llc->daddr.mac, IFHWADDRLEN);
1050 sllc.sllc_sap = llc->sap->laddr.lsap;
1053 sllc.sllc_arphrd = llc->dev->type;
1054 memcpy(&sllc.sllc_mac, llc->dev->dev_addr,
1058 sllc.sllc_family = AF_LLC;
1059 memcpy(uaddr, &sllc, sizeof(sllc));
1067 * llc_ui_ioctl - io controls for PF_LLC
1068 * @sock: Socket to get/set info
1070 * @arg: optional argument for cmd
1072 * get/set info on llc sockets
1074 static int llc_ui_ioctl(struct socket *sock, unsigned int cmd,
1077 return -ENOIOCTLCMD;
1081 * llc_ui_setsockopt - set various connection specific parameters.
1082 * @sock: Socket to set options on.
1083 * @level: Socket level user is requesting operations on.
1084 * @optname: Operation name.
1085 * @optval: User provided operation data.
1086 * @optlen: Length of optval.
1088 * Set various connection specific parameters.
1090 static int llc_ui_setsockopt(struct socket *sock, int level, int optname,
1091 char __user *optval, unsigned int optlen)
1093 struct sock *sk = sock->sk;
1094 struct llc_sock *llc = llc_sk(sk);
1099 if (unlikely(level != SOL_LLC || optlen != sizeof(int)))
1101 rc = get_user(opt, (int __user *)optval);
1107 if (opt > LLC_OPT_MAX_RETRY)
1112 if (opt > LLC_OPT_MAX_SIZE)
1116 case LLC_OPT_ACK_TMR_EXP:
1117 if (opt > LLC_OPT_MAX_ACK_TMR_EXP)
1119 llc->ack_timer.expire = opt * HZ;
1121 case LLC_OPT_P_TMR_EXP:
1122 if (opt > LLC_OPT_MAX_P_TMR_EXP)
1124 llc->pf_cycle_timer.expire = opt * HZ;
1126 case LLC_OPT_REJ_TMR_EXP:
1127 if (opt > LLC_OPT_MAX_REJ_TMR_EXP)
1129 llc->rej_sent_timer.expire = opt * HZ;
1131 case LLC_OPT_BUSY_TMR_EXP:
1132 if (opt > LLC_OPT_MAX_BUSY_TMR_EXP)
1134 llc->busy_state_timer.expire = opt * HZ;
1136 case LLC_OPT_TX_WIN:
1137 if (opt > LLC_OPT_MAX_WIN)
1141 case LLC_OPT_RX_WIN:
1142 if (opt > LLC_OPT_MAX_WIN)
1146 case LLC_OPT_PKTINFO:
1148 llc->cmsg_flags |= LLC_CMSG_PKTINFO;
1150 llc->cmsg_flags &= ~LLC_CMSG_PKTINFO;
1163 * llc_ui_getsockopt - get connection specific socket info
1164 * @sock: Socket to get information from.
1165 * @level: Socket level user is requesting operations on.
1166 * @optname: Operation name.
1167 * @optval: Variable to return operation data in.
1168 * @optlen: Length of optval.
1170 * Get connection specific socket information.
1172 static int llc_ui_getsockopt(struct socket *sock, int level, int optname,
1173 char __user *optval, int __user *optlen)
1175 struct sock *sk = sock->sk;
1176 struct llc_sock *llc = llc_sk(sk);
1177 int val = 0, len = 0, rc = -EINVAL;
1180 if (unlikely(level != SOL_LLC))
1182 rc = get_user(len, optlen);
1186 if (len != sizeof(int))
1190 val = llc->n2; break;
1192 val = llc->n1; break;
1193 case LLC_OPT_ACK_TMR_EXP:
1194 val = llc->ack_timer.expire / HZ; break;
1195 case LLC_OPT_P_TMR_EXP:
1196 val = llc->pf_cycle_timer.expire / HZ; break;
1197 case LLC_OPT_REJ_TMR_EXP:
1198 val = llc->rej_sent_timer.expire / HZ; break;
1199 case LLC_OPT_BUSY_TMR_EXP:
1200 val = llc->busy_state_timer.expire / HZ; break;
1201 case LLC_OPT_TX_WIN:
1202 val = llc->k; break;
1203 case LLC_OPT_RX_WIN:
1204 val = llc->rw; break;
1205 case LLC_OPT_PKTINFO:
1206 val = (llc->cmsg_flags & LLC_CMSG_PKTINFO) != 0;
1213 if (put_user(len, optlen) || copy_to_user(optval, &val, len))
1220 static const struct net_proto_family llc_ui_family_ops = {
1222 .create = llc_ui_create,
1223 .owner = THIS_MODULE,
1226 static const struct proto_ops llc_ui_ops = {
1228 .owner = THIS_MODULE,
1229 .release = llc_ui_release,
1230 .bind = llc_ui_bind,
1231 .connect = llc_ui_connect,
1232 .socketpair = sock_no_socketpair,
1233 .accept = llc_ui_accept,
1234 .getname = llc_ui_getname,
1235 .poll = datagram_poll,
1236 .ioctl = llc_ui_ioctl,
1237 .listen = llc_ui_listen,
1238 .shutdown = llc_ui_shutdown,
1239 .setsockopt = llc_ui_setsockopt,
1240 .getsockopt = llc_ui_getsockopt,
1241 .sendmsg = llc_ui_sendmsg,
1242 .recvmsg = llc_ui_recvmsg,
1243 .mmap = sock_no_mmap,
1244 .sendpage = sock_no_sendpage,
1247 static const char llc_proc_err_msg[] __initconst =
1248 KERN_CRIT "LLC: Unable to register the proc_fs entries\n";
1249 static const char llc_sysctl_err_msg[] __initconst =
1250 KERN_CRIT "LLC: Unable to register the sysctl entries\n";
1251 static const char llc_sock_err_msg[] __initconst =
1252 KERN_CRIT "LLC: Unable to register the network family\n";
1254 static int __init llc2_init(void)
1256 int rc = proto_register(&llc_proto, 0);
1261 llc_build_offset_table();
1263 llc_ui_sap_last_autoport = LLC_SAP_DYN_START;
1264 rc = llc_proc_init();
1266 printk(llc_proc_err_msg);
1269 rc = llc_sysctl_init();
1271 printk(llc_sysctl_err_msg);
1274 rc = sock_register(&llc_ui_family_ops);
1276 printk(llc_sock_err_msg);
1279 llc_add_pack(LLC_DEST_SAP, llc_sap_handler);
1280 llc_add_pack(LLC_DEST_CONN, llc_conn_handler);
1289 proto_unregister(&llc_proto);
1293 static void __exit llc2_exit(void)
1296 llc_remove_pack(LLC_DEST_SAP);
1297 llc_remove_pack(LLC_DEST_CONN);
1298 sock_unregister(PF_LLC);
1301 proto_unregister(&llc_proto);
1304 module_init(llc2_init);
1305 module_exit(llc2_exit);
1307 MODULE_LICENSE("GPL");
1308 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1309 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1310 MODULE_ALIAS_NETPROTO(PF_LLC);