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
;
101 if (addr
->sllc_test
|| addr
->sllc_xid
)
103 else if (sk
->sk_type
== SOCK_STREAM
)
109 * llc_ui_send_data - send data via reliable llc2 connection
110 * @sk: Connection the socket is using.
111 * @skb: Data the user wishes to send.
112 * @noblock: can we block waiting for data?
114 * Send data via reliable llc2 connection.
115 * Returns 0 upon success, non-zero if action did not succeed.
117 static int llc_ui_send_data(struct sock
* sk
, struct sk_buff
*skb
, int noblock
)
119 struct llc_sock
* llc
= llc_sk(sk
);
122 if (unlikely(llc_data_accept_state(llc
->state
) ||
123 llc
->remote_busy_flag
||
125 long timeout
= sock_sndtimeo(sk
, noblock
);
127 rc
= llc_ui_wait_for_busy_core(sk
, timeout
);
130 rc
= llc_build_and_send_pkt(sk
, skb
);
134 static void llc_ui_sk_init(struct socket
*sock
, struct sock
*sk
)
136 sock_graft(sk
, sock
);
137 sk
->sk_type
= sock
->type
;
138 sock
->ops
= &llc_ui_ops
;
141 static struct proto llc_proto
= {
143 .owner
= THIS_MODULE
,
144 .obj_size
= sizeof(struct llc_sock
),
145 .slab_flags
= SLAB_DESTROY_BY_RCU
,
149 * llc_ui_create - alloc and init a new llc_ui socket
150 * @net: network namespace (must be default network)
151 * @sock: Socket to initialize and attach allocated sk to.
153 * @kern: on behalf of kernel or userspace
155 * Allocate and initialize a new llc_ui socket, validate the user wants a
156 * socket type we have available.
157 * Returns 0 upon success, negative upon failure.
159 static int llc_ui_create(struct net
*net
, struct socket
*sock
, int protocol
,
163 int rc
= -ESOCKTNOSUPPORT
;
165 if (!ns_capable(net
->user_ns
, CAP_NET_RAW
))
168 if (!net_eq(net
, &init_net
))
169 return -EAFNOSUPPORT
;
171 if (likely(sock
->type
== SOCK_DGRAM
|| sock
->type
== SOCK_STREAM
)) {
173 sk
= llc_sk_alloc(net
, PF_LLC
, GFP_KERNEL
, &llc_proto
, kern
);
176 llc_ui_sk_init(sock
, sk
);
183 * llc_ui_release - shutdown socket
184 * @sock: Socket to release.
186 * Shutdown and deallocate an existing socket.
188 static int llc_ui_release(struct socket
*sock
)
190 struct sock
*sk
= sock
->sk
;
191 struct llc_sock
*llc
;
193 if (unlikely(sk
== NULL
))
198 dprintk("%s: closing local(%02X) remote(%02X)\n", __func__
,
199 llc
->laddr
.lsap
, llc
->daddr
.lsap
);
200 if (!llc_send_disc(sk
))
201 llc_ui_wait_for_disc(sk
, sk
->sk_rcvtimeo
);
202 if (!sock_flag(sk
, SOCK_ZAPPED
))
203 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_rcu(&init_net
, sk
->sk_bound_dev_if
);
324 if (!addr
->sllc_arphrd
)
325 addr
->sllc_arphrd
= llc
->dev
->type
;
326 if (is_zero_ether_addr(addr
->sllc_mac
))
327 memcpy(addr
->sllc_mac
, llc
->dev
->dev_addr
,
329 if (addr
->sllc_arphrd
!= llc
->dev
->type
||
330 !ether_addr_equal(addr
->sllc_mac
,
331 llc
->dev
->dev_addr
)) {
337 llc
->dev
= dev_getbyhwaddr_rcu(&init_net
, addr
->sllc_arphrd
,
344 if (!addr
->sllc_sap
) {
346 addr
->sllc_sap
= llc_ui_autoport();
350 sap
= llc_sap_find(addr
->sllc_sap
);
352 sap
= llc_sap_open(addr
->sllc_sap
, NULL
);
353 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 int)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
)
537 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
540 add_wait_queue(sk_sleep(sk
), &wait
);
542 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
== TCP_CLOSE
, &wait
))
545 if (signal_pending(current
))
552 remove_wait_queue(sk_sleep(sk
), &wait
);
556 static bool llc_ui_wait_for_conn(struct sock
*sk
, long timeout
)
558 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
560 add_wait_queue(sk_sleep(sk
), &wait
);
562 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
!= TCP_SYN_SENT
, &wait
))
564 if (signal_pending(current
) || !timeout
)
567 remove_wait_queue(sk_sleep(sk
), &wait
);
571 static int llc_ui_wait_for_busy_core(struct sock
*sk
, long timeout
)
573 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
574 struct llc_sock
*llc
= llc_sk(sk
);
577 add_wait_queue(sk_sleep(sk
), &wait
);
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
&&
584 !llc
->p_flag
), &wait
))
587 if (signal_pending(current
))
593 remove_wait_queue(sk_sleep(sk
), &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
, NULL
))
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 memset(&info
, 0, sizeof(info
));
632 info
.lpi_ifindex
= llc_sk(skb
->sk
)->dev
->ifindex
;
633 llc_pdu_decode_dsap(skb
, &info
.lpi_sap
);
634 llc_pdu_decode_da(skb
, info
.lpi_mac
);
635 put_cmsg(msg
, SOL_LLC
, LLC_OPT_PKTINFO
, sizeof(info
), &info
);
640 * llc_ui_accept - accept a new incoming connection.
641 * @sock: Socket which connections arrive on.
642 * @newsock: Socket to move incoming connection to.
643 * @flags: User specified operational flags.
645 * Accept a new incoming connection.
646 * Returns 0 upon success, negative otherwise.
648 static int llc_ui_accept(struct socket
*sock
, struct socket
*newsock
, int flags
)
650 struct sock
*sk
= sock
->sk
, *newsk
;
651 struct llc_sock
*llc
, *newllc
;
653 int rc
= -EOPNOTSUPP
;
655 dprintk("%s: accepting on %02X\n", __func__
,
656 llc_sk(sk
)->laddr
.lsap
);
658 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
661 if (unlikely(sock
->state
!= SS_UNCONNECTED
||
662 sk
->sk_state
!= TCP_LISTEN
))
664 /* wait for a connection to arrive. */
665 if (skb_queue_empty(&sk
->sk_receive_queue
)) {
666 rc
= llc_wait_data(sk
, sk
->sk_rcvtimeo
);
670 dprintk("%s: got a new connection on %02X\n", __func__
,
671 llc_sk(sk
)->laddr
.lsap
);
672 skb
= skb_dequeue(&sk
->sk_receive_queue
);
678 /* attach connection to a new socket. */
679 llc_ui_sk_init(newsock
, newsk
);
680 sock_reset_flag(newsk
, SOCK_ZAPPED
);
681 newsk
->sk_state
= TCP_ESTABLISHED
;
682 newsock
->state
= SS_CONNECTED
;
684 newllc
= llc_sk(newsk
);
685 memcpy(&newllc
->addr
, &llc
->addr
, sizeof(newllc
->addr
));
686 newllc
->link
= llc_ui_next_link_no(newllc
->laddr
.lsap
);
688 /* put original socket back into a clean listen state. */
689 sk
->sk_state
= TCP_LISTEN
;
690 sk
->sk_ack_backlog
--;
691 dprintk("%s: ok success on %02X, client on %02X\n", __func__
,
692 llc_sk(sk
)->addr
.sllc_sap
, newllc
->daddr
.lsap
);
701 * llc_ui_recvmsg - copy received data to the socket user.
702 * @sock: Socket to copy data from.
703 * @msg: Various user space related information.
704 * @len: Size of user buffer.
705 * @flags: User specified flags.
707 * Copy received data to the socket user.
708 * Returns non-negative upon success, negative otherwise.
710 static int llc_ui_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
,
713 DECLARE_SOCKADDR(struct sockaddr_llc
*, uaddr
, msg
->msg_name
);
714 const int nonblock
= flags
& MSG_DONTWAIT
;
715 struct sk_buff
*skb
= NULL
;
716 struct sock
*sk
= sock
->sk
;
717 struct llc_sock
*llc
= llc_sk(sk
);
718 unsigned long cpu_flags
;
723 int target
; /* Read at least this many bytes */
728 if (unlikely(sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_LISTEN
))
731 timeo
= sock_rcvtimeo(sk
, nonblock
);
733 seq
= &llc
->copied_seq
;
734 if (flags
& MSG_PEEK
) {
735 peek_seq
= llc
->copied_seq
;
739 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, len
);
746 * We need to check signals first, to get correct SIGURG
747 * handling. FIXME: Need to check this doesn't impact 1003.1g
748 * and move it down to the bottom of the loop
750 if (signal_pending(current
)) {
753 copied
= timeo
? sock_intr_errno(timeo
) : -EAGAIN
;
757 /* Next get a buffer. */
759 skb
= skb_peek(&sk
->sk_receive_queue
);
764 /* Well, if we have backlog, try to process it now yet. */
766 if (copied
>= target
&& !sk
->sk_backlog
.tail
)
771 sk
->sk_state
== TCP_CLOSE
||
772 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
777 if (sock_flag(sk
, SOCK_DONE
))
781 copied
= sock_error(sk
);
784 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
787 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_CLOSE
) {
788 if (!sock_flag(sk
, SOCK_DONE
)) {
790 * This occurs when user tries to read
791 * from never connected socket.
804 if (copied
>= target
) { /* Do not sleep, just process backlog. */
808 sk_wait_data(sk
, &timeo
, NULL
);
810 if ((flags
& MSG_PEEK
) && peek_seq
!= llc
->copied_seq
) {
811 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
813 task_pid_nr(current
));
814 peek_seq
= llc
->copied_seq
;
819 /* Ok so how much can we use? */
820 used
= skb
->len
- offset
;
824 if (!(flags
& MSG_TRUNC
)) {
825 int rc
= skb_copy_datagram_msg(skb
, offset
, msg
, used
);
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 spin_lock_irqsave(&sk
->sk_receive_queue
.lock
, cpu_flags
);
845 spin_unlock_irqrestore(&sk
->sk_receive_queue
.lock
, cpu_flags
);
850 if (used
+ offset
< skb_len
)
858 if (uaddr
!= NULL
&& skb
!= NULL
) {
859 memcpy(uaddr
, llc_ui_skb_cb(skb
), sizeof(*uaddr
));
860 msg
->msg_namelen
= sizeof(*uaddr
);
862 if (llc_sk(sk
)->cmsg_flags
)
863 llc_cmsg_rcv(msg
, skb
);
865 if (!(flags
& MSG_PEEK
)) {
866 spin_lock_irqsave(&sk
->sk_receive_queue
.lock
, cpu_flags
);
868 spin_unlock_irqrestore(&sk
->sk_receive_queue
.lock
, cpu_flags
);
876 * llc_ui_sendmsg - Transmit data provided by the socket user.
877 * @sock: Socket to transmit data from.
878 * @msg: Various user related information.
879 * @len: Length of data to transmit.
881 * Transmit data provided by the socket user.
882 * Returns non-negative upon success, negative otherwise.
884 static int llc_ui_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
886 struct sock
*sk
= sock
->sk
;
887 struct llc_sock
*llc
= llc_sk(sk
);
888 DECLARE_SOCKADDR(struct sockaddr_llc
*, addr
, msg
->msg_name
);
889 int flags
= msg
->msg_flags
;
890 int noblock
= flags
& MSG_DONTWAIT
;
893 int rc
= -EINVAL
, copied
= 0, hdrlen
;
895 dprintk("%s: sending from %02X to %02X\n", __func__
,
896 llc
->laddr
.lsap
, llc
->daddr
.lsap
);
899 if (msg
->msg_namelen
< sizeof(*addr
))
902 if (llc_ui_addr_null(&llc
->addr
))
906 /* must bind connection to sap if user hasn't done it. */
907 if (sock_flag(sk
, SOCK_ZAPPED
)) {
908 /* bind to sap with null dev, exclusive. */
909 rc
= llc_ui_autobind(sock
, addr
);
913 hdrlen
= llc
->dev
->hard_header_len
+ llc_ui_header_len(sk
, addr
);
915 if (size
> llc
->dev
->mtu
)
916 size
= llc
->dev
->mtu
;
917 copied
= size
- hdrlen
;
919 skb
= sock_alloc_send_skb(sk
, size
, noblock
, &rc
);
924 skb
->protocol
= llc_proto_type(addr
->sllc_arphrd
);
925 skb_reserve(skb
, hdrlen
);
926 rc
= memcpy_from_msg(skb_put(skb
, copied
), msg
, copied
);
929 if (sk
->sk_type
== SOCK_DGRAM
|| addr
->sllc_ua
) {
930 llc_build_and_send_ui_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
934 if (addr
->sllc_test
) {
935 llc_build_and_send_test_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
939 if (addr
->sllc_xid
) {
940 llc_build_and_send_xid_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
945 if (!(sk
->sk_type
== SOCK_STREAM
&& !addr
->sllc_ua
))
947 rc
= llc_ui_send_data(sk
, skb
, noblock
);
952 dprintk("%s: failed sending from %02X to %02X: %d\n",
953 __func__
, llc
->laddr
.lsap
, llc
->daddr
.lsap
, rc
);
956 return rc
? : copied
;
960 * llc_ui_getname - return the address info of a socket
961 * @sock: Socket to get address of.
962 * @uaddr: Address structure to return information.
963 * @uaddrlen: Length of address structure.
964 * @peer: Does user want local or remote address information.
966 * Return the address information of a socket.
968 static int llc_ui_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
969 int *uaddrlen
, int peer
)
971 struct sockaddr_llc sllc
;
972 struct sock
*sk
= sock
->sk
;
973 struct llc_sock
*llc
= llc_sk(sk
);
976 memset(&sllc
, 0, sizeof(sllc
));
978 if (sock_flag(sk
, SOCK_ZAPPED
))
980 *uaddrlen
= sizeof(sllc
);
983 if (sk
->sk_state
!= TCP_ESTABLISHED
)
986 sllc
.sllc_arphrd
= llc
->dev
->type
;
987 sllc
.sllc_sap
= llc
->daddr
.lsap
;
988 memcpy(&sllc
.sllc_mac
, &llc
->daddr
.mac
, IFHWADDRLEN
);
993 sllc
.sllc_sap
= llc
->sap
->laddr
.lsap
;
996 sllc
.sllc_arphrd
= llc
->dev
->type
;
997 memcpy(&sllc
.sllc_mac
, llc
->dev
->dev_addr
,
1002 sllc
.sllc_family
= AF_LLC
;
1003 memcpy(uaddr
, &sllc
, sizeof(sllc
));
1010 * llc_ui_ioctl - io controls for PF_LLC
1011 * @sock: Socket to get/set info
1013 * @arg: optional argument for cmd
1015 * get/set info on llc sockets
1017 static int llc_ui_ioctl(struct socket
*sock
, unsigned int cmd
,
1020 return -ENOIOCTLCMD
;
1024 * llc_ui_setsockopt - set various connection specific parameters.
1025 * @sock: Socket to set options on.
1026 * @level: Socket level user is requesting operations on.
1027 * @optname: Operation name.
1028 * @optval: User provided operation data.
1029 * @optlen: Length of optval.
1031 * Set various connection specific parameters.
1033 static int llc_ui_setsockopt(struct socket
*sock
, int level
, int optname
,
1034 char __user
*optval
, unsigned int optlen
)
1036 struct sock
*sk
= sock
->sk
;
1037 struct llc_sock
*llc
= llc_sk(sk
);
1042 if (unlikely(level
!= SOL_LLC
|| optlen
!= sizeof(int)))
1044 rc
= get_user(opt
, (int __user
*)optval
);
1050 if (opt
> LLC_OPT_MAX_RETRY
)
1055 if (opt
> LLC_OPT_MAX_SIZE
)
1059 case LLC_OPT_ACK_TMR_EXP
:
1060 if (opt
> LLC_OPT_MAX_ACK_TMR_EXP
)
1062 llc
->ack_timer
.expire
= opt
* HZ
;
1064 case LLC_OPT_P_TMR_EXP
:
1065 if (opt
> LLC_OPT_MAX_P_TMR_EXP
)
1067 llc
->pf_cycle_timer
.expire
= opt
* HZ
;
1069 case LLC_OPT_REJ_TMR_EXP
:
1070 if (opt
> LLC_OPT_MAX_REJ_TMR_EXP
)
1072 llc
->rej_sent_timer
.expire
= opt
* HZ
;
1074 case LLC_OPT_BUSY_TMR_EXP
:
1075 if (opt
> LLC_OPT_MAX_BUSY_TMR_EXP
)
1077 llc
->busy_state_timer
.expire
= opt
* HZ
;
1079 case LLC_OPT_TX_WIN
:
1080 if (opt
> LLC_OPT_MAX_WIN
)
1084 case LLC_OPT_RX_WIN
:
1085 if (opt
> LLC_OPT_MAX_WIN
)
1089 case LLC_OPT_PKTINFO
:
1091 llc
->cmsg_flags
|= LLC_CMSG_PKTINFO
;
1093 llc
->cmsg_flags
&= ~LLC_CMSG_PKTINFO
;
1106 * llc_ui_getsockopt - get connection specific socket info
1107 * @sock: Socket to get information from.
1108 * @level: Socket level user is requesting operations on.
1109 * @optname: Operation name.
1110 * @optval: Variable to return operation data in.
1111 * @optlen: Length of optval.
1113 * Get connection specific socket information.
1115 static int llc_ui_getsockopt(struct socket
*sock
, int level
, int optname
,
1116 char __user
*optval
, int __user
*optlen
)
1118 struct sock
*sk
= sock
->sk
;
1119 struct llc_sock
*llc
= llc_sk(sk
);
1120 int val
= 0, len
= 0, rc
= -EINVAL
;
1123 if (unlikely(level
!= SOL_LLC
))
1125 rc
= get_user(len
, optlen
);
1129 if (len
!= sizeof(int))
1133 val
= llc
->n2
; break;
1135 val
= llc
->n1
; break;
1136 case LLC_OPT_ACK_TMR_EXP
:
1137 val
= llc
->ack_timer
.expire
/ HZ
; break;
1138 case LLC_OPT_P_TMR_EXP
:
1139 val
= llc
->pf_cycle_timer
.expire
/ HZ
; break;
1140 case LLC_OPT_REJ_TMR_EXP
:
1141 val
= llc
->rej_sent_timer
.expire
/ HZ
; break;
1142 case LLC_OPT_BUSY_TMR_EXP
:
1143 val
= llc
->busy_state_timer
.expire
/ HZ
; break;
1144 case LLC_OPT_TX_WIN
:
1145 val
= llc
->k
; break;
1146 case LLC_OPT_RX_WIN
:
1147 val
= llc
->rw
; break;
1148 case LLC_OPT_PKTINFO
:
1149 val
= (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) != 0;
1156 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
1163 static const struct net_proto_family llc_ui_family_ops
= {
1165 .create
= llc_ui_create
,
1166 .owner
= THIS_MODULE
,
1169 static const struct proto_ops llc_ui_ops
= {
1171 .owner
= THIS_MODULE
,
1172 .release
= llc_ui_release
,
1173 .bind
= llc_ui_bind
,
1174 .connect
= llc_ui_connect
,
1175 .socketpair
= sock_no_socketpair
,
1176 .accept
= llc_ui_accept
,
1177 .getname
= llc_ui_getname
,
1178 .poll
= datagram_poll
,
1179 .ioctl
= llc_ui_ioctl
,
1180 .listen
= llc_ui_listen
,
1181 .shutdown
= llc_ui_shutdown
,
1182 .setsockopt
= llc_ui_setsockopt
,
1183 .getsockopt
= llc_ui_getsockopt
,
1184 .sendmsg
= llc_ui_sendmsg
,
1185 .recvmsg
= llc_ui_recvmsg
,
1186 .mmap
= sock_no_mmap
,
1187 .sendpage
= sock_no_sendpage
,
1190 static const char llc_proc_err_msg
[] __initconst
=
1191 KERN_CRIT
"LLC: Unable to register the proc_fs entries\n";
1192 static const char llc_sysctl_err_msg
[] __initconst
=
1193 KERN_CRIT
"LLC: Unable to register the sysctl entries\n";
1194 static const char llc_sock_err_msg
[] __initconst
=
1195 KERN_CRIT
"LLC: Unable to register the network family\n";
1197 static int __init
llc2_init(void)
1199 int rc
= proto_register(&llc_proto
, 0);
1204 llc_build_offset_table();
1206 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
1207 rc
= llc_proc_init();
1209 printk(llc_proc_err_msg
);
1212 rc
= llc_sysctl_init();
1214 printk(llc_sysctl_err_msg
);
1217 rc
= sock_register(&llc_ui_family_ops
);
1219 printk(llc_sock_err_msg
);
1222 llc_add_pack(LLC_DEST_SAP
, llc_sap_handler
);
1223 llc_add_pack(LLC_DEST_CONN
, llc_conn_handler
);
1232 proto_unregister(&llc_proto
);
1236 static void __exit
llc2_exit(void)
1239 llc_remove_pack(LLC_DEST_SAP
);
1240 llc_remove_pack(LLC_DEST_CONN
);
1241 sock_unregister(PF_LLC
);
1244 proto_unregister(&llc_proto
);
1247 module_init(llc2_init
);
1248 module_exit(llc2_exit
);
1250 MODULE_LICENSE("GPL");
1251 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1252 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1253 MODULE_ALIAS_NETPROTO(PF_LLC
);