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_TYPESAFE_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 struct llc_sap
*sap
= llc
->sap
;
205 /* Hold this for release_sock(), so that llc_backlog_rcv()
206 * could still use it.
209 llc_sap_remove_socket(llc
->sap
, sk
);
224 * llc_ui_autoport - provide dynamically allocate SAP number
226 * Provide the caller with a dynamically allocated SAP number according
227 * to the rules that are set in this function. Returns: 0, upon failure,
228 * SAP number otherwise.
230 static int llc_ui_autoport(void)
235 while (tries
< LLC_SAP_DYN_TRIES
) {
236 for (i
= llc_ui_sap_last_autoport
;
237 i
< LLC_SAP_DYN_STOP
; i
+= 2) {
238 sap
= llc_sap_find(i
);
240 llc_ui_sap_last_autoport
= i
+ 2;
245 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
254 * llc_ui_autobind - automatically bind a socket to a sap
255 * @sock: socket to bind
256 * @addr: address to connect to
258 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
259 * specifically used llc_ui_bind to bind to an specific address/sap
261 * Returns: 0 upon success, negative otherwise.
263 static int llc_ui_autobind(struct socket
*sock
, struct sockaddr_llc
*addr
)
265 struct sock
*sk
= sock
->sk
;
266 struct llc_sock
*llc
= llc_sk(sk
);
270 if (!sock_flag(sk
, SOCK_ZAPPED
))
273 if (sk
->sk_bound_dev_if
) {
274 llc
->dev
= dev_get_by_index(&init_net
, sk
->sk_bound_dev_if
);
275 if (llc
->dev
&& addr
->sllc_arphrd
!= llc
->dev
->type
) {
280 llc
->dev
= dev_getfirstbyhwtype(&init_net
, addr
->sllc_arphrd
);
284 llc
->laddr
.lsap
= llc_ui_autoport();
285 if (!llc
->laddr
.lsap
)
287 rc
= -EBUSY
; /* some other network layer is using the sap */
288 sap
= llc_sap_open(llc
->laddr
.lsap
, NULL
);
291 memcpy(llc
->laddr
.mac
, llc
->dev
->dev_addr
, IFHWADDRLEN
);
292 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
293 /* assign new connection to its SAP */
294 llc_sap_add_socket(sap
, sk
);
295 sock_reset_flag(sk
, SOCK_ZAPPED
);
302 * llc_ui_bind - bind a socket to a specific address.
303 * @sock: Socket to bind an address to.
304 * @uaddr: Address the user wants the socket bound to.
305 * @addrlen: Length of the uaddr structure.
307 * Bind a socket to a specific address. For llc a user is able to bind to
308 * a specific sap only or mac + sap.
309 * If the user desires to bind to a specific mac + sap, it is possible to
310 * have multiple sap connections via multiple macs.
311 * Bind and autobind for that matter must enforce the correct sap usage
312 * otherwise all hell will break loose.
313 * Returns: 0 upon success, negative otherwise.
315 static int llc_ui_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addrlen
)
317 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
318 struct sock
*sk
= sock
->sk
;
319 struct llc_sock
*llc
= llc_sk(sk
);
324 if (unlikely(!sock_flag(sk
, SOCK_ZAPPED
) || addrlen
!= sizeof(*addr
)))
327 if (unlikely(addr
->sllc_family
!= AF_LLC
))
329 dprintk("%s: binding %02X\n", __func__
, addr
->sllc_sap
);
332 if (sk
->sk_bound_dev_if
) {
333 llc
->dev
= dev_get_by_index_rcu(&init_net
, sk
->sk_bound_dev_if
);
335 if (!addr
->sllc_arphrd
)
336 addr
->sllc_arphrd
= llc
->dev
->type
;
337 if (is_zero_ether_addr(addr
->sllc_mac
))
338 memcpy(addr
->sllc_mac
, llc
->dev
->dev_addr
,
340 if (addr
->sllc_arphrd
!= llc
->dev
->type
||
341 !ether_addr_equal(addr
->sllc_mac
,
342 llc
->dev
->dev_addr
)) {
348 llc
->dev
= dev_getbyhwaddr_rcu(&init_net
, addr
->sllc_arphrd
,
355 if (!addr
->sllc_sap
) {
357 addr
->sllc_sap
= llc_ui_autoport();
361 sap
= llc_sap_find(addr
->sllc_sap
);
363 sap
= llc_sap_open(addr
->sllc_sap
, NULL
);
364 rc
= -EBUSY
; /* some other network layer is using the sap */
368 struct llc_addr laddr
, daddr
;
371 memset(&laddr
, 0, sizeof(laddr
));
372 memset(&daddr
, 0, sizeof(daddr
));
374 * FIXME: check if the address is multicast,
375 * only SOCK_DGRAM can do this.
377 memcpy(laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
378 laddr
.lsap
= addr
->sllc_sap
;
379 rc
= -EADDRINUSE
; /* mac + sap clash. */
380 ask
= llc_lookup_established(sap
, &daddr
, &laddr
);
386 llc
->laddr
.lsap
= addr
->sllc_sap
;
387 memcpy(llc
->laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
388 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
389 /* assign new connection to its SAP */
390 llc_sap_add_socket(sap
, sk
);
391 sock_reset_flag(sk
, SOCK_ZAPPED
);
401 * llc_ui_shutdown - shutdown a connect llc2 socket.
402 * @sock: Socket to shutdown.
403 * @how: What part of the socket to shutdown.
405 * Shutdown a connected llc2 socket. Currently this function only supports
406 * shutting down both sends and receives (2), we could probably make this
407 * function such that a user can shutdown only half the connection but not
409 * Returns: 0 upon success, negative otherwise.
411 static int llc_ui_shutdown(struct socket
*sock
, int how
)
413 struct sock
*sk
= sock
->sk
;
417 if (unlikely(sk
->sk_state
!= TCP_ESTABLISHED
))
422 rc
= llc_send_disc(sk
);
424 rc
= llc_ui_wait_for_disc(sk
, sk
->sk_rcvtimeo
);
425 /* Wake up anyone sleeping in poll */
426 sk
->sk_state_change(sk
);
433 * llc_ui_connect - Connect to a remote llc2 mac + sap.
434 * @sock: Socket which will be connected to the remote destination.
435 * @uaddr: Remote and possibly the local address of the new connection.
436 * @addrlen: Size of uaddr structure.
437 * @flags: Operational flags specified by the user.
439 * Connect to a remote llc2 mac + sap. The caller must specify the
440 * destination mac and address to connect to. If the user hasn't previously
441 * called bind(2) with a smac the address of the first interface of the
442 * specified arp type will be used.
443 * This function will autobind if user did not previously call bind.
444 * Returns: 0 upon success, negative otherwise.
446 static int llc_ui_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
447 int addrlen
, int flags
)
449 struct sock
*sk
= sock
->sk
;
450 struct llc_sock
*llc
= llc_sk(sk
);
451 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
455 if (unlikely(addrlen
!= sizeof(*addr
)))
458 if (unlikely(addr
->sllc_family
!= AF_LLC
))
460 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
463 if (unlikely(sock
->state
== SS_CONNECTING
))
465 /* bind connection to sap if user hasn't done it. */
466 if (sock_flag(sk
, SOCK_ZAPPED
)) {
467 /* bind to sap with null dev, exclusive */
468 rc
= llc_ui_autobind(sock
, addr
);
472 llc
->daddr
.lsap
= addr
->sllc_sap
;
473 memcpy(llc
->daddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
474 sock
->state
= SS_CONNECTING
;
475 sk
->sk_state
= TCP_SYN_SENT
;
476 llc
->link
= llc_ui_next_link_no(llc
->sap
->laddr
.lsap
);
477 rc
= llc_establish_connection(sk
, llc
->dev
->dev_addr
,
478 addr
->sllc_mac
, addr
->sllc_sap
);
480 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__
);
481 sock
->state
= SS_UNCONNECTED
;
482 sk
->sk_state
= TCP_CLOSE
;
486 if (sk
->sk_state
== TCP_SYN_SENT
) {
487 const long timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
489 if (!timeo
|| !llc_ui_wait_for_conn(sk
, timeo
))
492 rc
= sock_intr_errno(timeo
);
493 if (signal_pending(current
))
497 if (sk
->sk_state
== TCP_CLOSE
)
500 sock
->state
= SS_CONNECTED
;
506 rc
= sock_error(sk
) ? : -ECONNABORTED
;
507 sock
->state
= SS_UNCONNECTED
;
512 * llc_ui_listen - allow a normal socket to accept incoming connections
513 * @sock: Socket to allow incoming connections on.
514 * @backlog: Number of connections to queue.
516 * Allow a normal socket to accept incoming connections.
517 * Returns 0 upon success, negative otherwise.
519 static int llc_ui_listen(struct socket
*sock
, int backlog
)
521 struct sock
*sk
= sock
->sk
;
525 if (unlikely(sock
->state
!= SS_UNCONNECTED
))
528 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
531 if (sock_flag(sk
, SOCK_ZAPPED
))
534 if (!(unsigned int)backlog
) /* BSDism */
536 sk
->sk_max_ack_backlog
= backlog
;
537 if (sk
->sk_state
!= TCP_LISTEN
) {
538 sk
->sk_ack_backlog
= 0;
539 sk
->sk_state
= TCP_LISTEN
;
541 sk
->sk_socket
->flags
|= __SO_ACCEPTCON
;
547 static int llc_ui_wait_for_disc(struct sock
*sk
, long timeout
)
549 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
552 add_wait_queue(sk_sleep(sk
), &wait
);
554 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
== TCP_CLOSE
, &wait
))
557 if (signal_pending(current
))
564 remove_wait_queue(sk_sleep(sk
), &wait
);
568 static bool llc_ui_wait_for_conn(struct sock
*sk
, long timeout
)
570 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
572 add_wait_queue(sk_sleep(sk
), &wait
);
574 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
!= TCP_SYN_SENT
, &wait
))
576 if (signal_pending(current
) || !timeout
)
579 remove_wait_queue(sk_sleep(sk
), &wait
);
583 static int llc_ui_wait_for_busy_core(struct sock
*sk
, long timeout
)
585 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
586 struct llc_sock
*llc
= llc_sk(sk
);
589 add_wait_queue(sk_sleep(sk
), &wait
);
592 if (sk_wait_event(sk
, &timeout
,
593 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
594 (!llc_data_accept_state(llc
->state
) &&
595 !llc
->remote_busy_flag
&&
596 !llc
->p_flag
), &wait
))
599 if (signal_pending(current
))
605 remove_wait_queue(sk_sleep(sk
), &wait
);
609 static int llc_wait_data(struct sock
*sk
, long timeo
)
615 * POSIX 1003.1g mandates this order.
621 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
626 rc
= sock_intr_errno(timeo
);
627 if (signal_pending(current
))
630 if (sk_wait_data(sk
, &timeo
, NULL
))
636 static void llc_cmsg_rcv(struct msghdr
*msg
, struct sk_buff
*skb
)
638 struct llc_sock
*llc
= llc_sk(skb
->sk
);
640 if (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) {
641 struct llc_pktinfo info
;
643 memset(&info
, 0, sizeof(info
));
644 info
.lpi_ifindex
= llc_sk(skb
->sk
)->dev
->ifindex
;
645 llc_pdu_decode_dsap(skb
, &info
.lpi_sap
);
646 llc_pdu_decode_da(skb
, info
.lpi_mac
);
647 put_cmsg(msg
, SOL_LLC
, LLC_OPT_PKTINFO
, sizeof(info
), &info
);
652 * llc_ui_accept - accept a new incoming connection.
653 * @sock: Socket which connections arrive on.
654 * @newsock: Socket to move incoming connection to.
655 * @flags: User specified operational flags.
656 * @kern: If the socket is kernel internal
658 * Accept a new incoming connection.
659 * Returns 0 upon success, negative otherwise.
661 static int llc_ui_accept(struct socket
*sock
, struct socket
*newsock
, int flags
,
664 struct sock
*sk
= sock
->sk
, *newsk
;
665 struct llc_sock
*llc
, *newllc
;
667 int rc
= -EOPNOTSUPP
;
669 dprintk("%s: accepting on %02X\n", __func__
,
670 llc_sk(sk
)->laddr
.lsap
);
672 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
675 if (unlikely(sock
->state
!= SS_UNCONNECTED
||
676 sk
->sk_state
!= TCP_LISTEN
))
678 /* wait for a connection to arrive. */
679 if (skb_queue_empty(&sk
->sk_receive_queue
)) {
680 rc
= llc_wait_data(sk
, sk
->sk_rcvtimeo
);
684 dprintk("%s: got a new connection on %02X\n", __func__
,
685 llc_sk(sk
)->laddr
.lsap
);
686 skb
= skb_dequeue(&sk
->sk_receive_queue
);
692 /* attach connection to a new socket. */
693 llc_ui_sk_init(newsock
, newsk
);
694 sock_reset_flag(newsk
, SOCK_ZAPPED
);
695 newsk
->sk_state
= TCP_ESTABLISHED
;
696 newsock
->state
= SS_CONNECTED
;
698 newllc
= llc_sk(newsk
);
699 memcpy(&newllc
->addr
, &llc
->addr
, sizeof(newllc
->addr
));
700 newllc
->link
= llc_ui_next_link_no(newllc
->laddr
.lsap
);
702 /* put original socket back into a clean listen state. */
703 sk
->sk_state
= TCP_LISTEN
;
704 sk
->sk_ack_backlog
--;
705 dprintk("%s: ok success on %02X, client on %02X\n", __func__
,
706 llc_sk(sk
)->addr
.sllc_sap
, newllc
->daddr
.lsap
);
715 * llc_ui_recvmsg - copy received data to the socket user.
716 * @sock: Socket to copy data from.
717 * @msg: Various user space related information.
718 * @len: Size of user buffer.
719 * @flags: User specified flags.
721 * Copy received data to the socket user.
722 * Returns non-negative upon success, negative otherwise.
724 static int llc_ui_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
,
727 DECLARE_SOCKADDR(struct sockaddr_llc
*, uaddr
, msg
->msg_name
);
728 const int nonblock
= flags
& MSG_DONTWAIT
;
729 struct sk_buff
*skb
= NULL
;
730 struct sock
*sk
= sock
->sk
;
731 struct llc_sock
*llc
= llc_sk(sk
);
736 int target
; /* Read at least this many bytes */
741 if (unlikely(sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_LISTEN
))
744 timeo
= sock_rcvtimeo(sk
, nonblock
);
746 seq
= &llc
->copied_seq
;
747 if (flags
& MSG_PEEK
) {
748 peek_seq
= llc
->copied_seq
;
752 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, len
);
759 * We need to check signals first, to get correct SIGURG
760 * handling. FIXME: Need to check this doesn't impact 1003.1g
761 * and move it down to the bottom of the loop
763 if (signal_pending(current
)) {
766 copied
= timeo
? sock_intr_errno(timeo
) : -EAGAIN
;
770 /* Next get a buffer. */
772 skb
= skb_peek(&sk
->sk_receive_queue
);
777 /* Well, if we have backlog, try to process it now yet. */
779 if (copied
>= target
&& !sk
->sk_backlog
.tail
)
784 sk
->sk_state
== TCP_CLOSE
||
785 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
790 if (sock_flag(sk
, SOCK_DONE
))
794 copied
= sock_error(sk
);
797 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
800 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_CLOSE
) {
801 if (!sock_flag(sk
, SOCK_DONE
)) {
803 * This occurs when user tries to read
804 * from never connected socket.
817 if (copied
>= target
) { /* Do not sleep, just process backlog. */
821 sk_wait_data(sk
, &timeo
, NULL
);
823 if ((flags
& MSG_PEEK
) && peek_seq
!= llc
->copied_seq
) {
824 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
826 task_pid_nr(current
));
827 peek_seq
= llc
->copied_seq
;
832 /* Ok so how much can we use? */
833 used
= skb
->len
- offset
;
837 if (!(flags
& MSG_TRUNC
)) {
838 int rc
= skb_copy_datagram_msg(skb
, offset
, msg
, used
);
840 /* Exception. Bailout! */
851 /* For non stream protcols we get one packet per recvmsg call */
852 if (sk
->sk_type
!= SOCK_STREAM
)
855 if (!(flags
& MSG_PEEK
)) {
856 skb_unlink(skb
, &sk
->sk_receive_queue
);
862 if (used
+ offset
< skb_len
)
870 if (uaddr
!= NULL
&& skb
!= NULL
) {
871 memcpy(uaddr
, llc_ui_skb_cb(skb
), sizeof(*uaddr
));
872 msg
->msg_namelen
= sizeof(*uaddr
);
874 if (llc_sk(sk
)->cmsg_flags
)
875 llc_cmsg_rcv(msg
, skb
);
877 if (!(flags
& MSG_PEEK
)) {
878 skb_unlink(skb
, &sk
->sk_receive_queue
);
887 * llc_ui_sendmsg - Transmit data provided by the socket user.
888 * @sock: Socket to transmit data from.
889 * @msg: Various user related information.
890 * @len: Length of data to transmit.
892 * Transmit data provided by the socket user.
893 * Returns non-negative upon success, negative otherwise.
895 static int llc_ui_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
897 struct sock
*sk
= sock
->sk
;
898 struct llc_sock
*llc
= llc_sk(sk
);
899 DECLARE_SOCKADDR(struct sockaddr_llc
*, addr
, msg
->msg_name
);
900 int flags
= msg
->msg_flags
;
901 int noblock
= flags
& MSG_DONTWAIT
;
904 int rc
= -EINVAL
, copied
= 0, hdrlen
;
906 dprintk("%s: sending from %02X to %02X\n", __func__
,
907 llc
->laddr
.lsap
, llc
->daddr
.lsap
);
910 if (msg
->msg_namelen
< sizeof(*addr
))
913 if (llc_ui_addr_null(&llc
->addr
))
917 /* must bind connection to sap if user hasn't done it. */
918 if (sock_flag(sk
, SOCK_ZAPPED
)) {
919 /* bind to sap with null dev, exclusive. */
920 rc
= llc_ui_autobind(sock
, addr
);
924 hdrlen
= llc
->dev
->hard_header_len
+ llc_ui_header_len(sk
, addr
);
926 if (size
> llc
->dev
->mtu
)
927 size
= llc
->dev
->mtu
;
928 copied
= size
- hdrlen
;
933 skb
= sock_alloc_send_skb(sk
, size
, noblock
, &rc
);
938 skb
->protocol
= llc_proto_type(addr
->sllc_arphrd
);
939 skb_reserve(skb
, hdrlen
);
940 rc
= memcpy_from_msg(skb_put(skb
, copied
), msg
, copied
);
943 if (sk
->sk_type
== SOCK_DGRAM
|| addr
->sllc_ua
) {
944 llc_build_and_send_ui_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
948 if (addr
->sllc_test
) {
949 llc_build_and_send_test_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
953 if (addr
->sllc_xid
) {
954 llc_build_and_send_xid_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
959 if (!(sk
->sk_type
== SOCK_STREAM
&& !addr
->sllc_ua
))
961 rc
= llc_ui_send_data(sk
, skb
, noblock
);
966 dprintk("%s: failed sending from %02X to %02X: %d\n",
967 __func__
, llc
->laddr
.lsap
, llc
->daddr
.lsap
, rc
);
970 return rc
? : copied
;
974 * llc_ui_getname - return the address info of a socket
975 * @sock: Socket to get address of.
976 * @uaddr: Address structure to return information.
977 * @uaddrlen: Length of address structure.
978 * @peer: Does user want local or remote address information.
980 * Return the address information of a socket.
982 static int llc_ui_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
985 struct sockaddr_llc sllc
;
986 struct sock
*sk
= sock
->sk
;
987 struct llc_sock
*llc
= llc_sk(sk
);
990 memset(&sllc
, 0, sizeof(sllc
));
992 if (sock_flag(sk
, SOCK_ZAPPED
))
996 if (sk
->sk_state
!= TCP_ESTABLISHED
)
999 sllc
.sllc_arphrd
= llc
->dev
->type
;
1000 sllc
.sllc_sap
= llc
->daddr
.lsap
;
1001 memcpy(&sllc
.sllc_mac
, &llc
->daddr
.mac
, IFHWADDRLEN
);
1006 sllc
.sllc_sap
= llc
->sap
->laddr
.lsap
;
1009 sllc
.sllc_arphrd
= llc
->dev
->type
;
1010 memcpy(&sllc
.sllc_mac
, llc
->dev
->dev_addr
,
1014 sllc
.sllc_family
= AF_LLC
;
1015 memcpy(uaddr
, &sllc
, sizeof(sllc
));
1023 * llc_ui_ioctl - io controls for PF_LLC
1024 * @sock: Socket to get/set info
1026 * @arg: optional argument for cmd
1028 * get/set info on llc sockets
1030 static int llc_ui_ioctl(struct socket
*sock
, unsigned int cmd
,
1033 return -ENOIOCTLCMD
;
1037 * llc_ui_setsockopt - set various connection specific parameters.
1038 * @sock: Socket to set options on.
1039 * @level: Socket level user is requesting operations on.
1040 * @optname: Operation name.
1041 * @optval: User provided operation data.
1042 * @optlen: Length of optval.
1044 * Set various connection specific parameters.
1046 static int llc_ui_setsockopt(struct socket
*sock
, int level
, int optname
,
1047 char __user
*optval
, unsigned int optlen
)
1049 struct sock
*sk
= sock
->sk
;
1050 struct llc_sock
*llc
= llc_sk(sk
);
1055 if (unlikely(level
!= SOL_LLC
|| optlen
!= sizeof(int)))
1057 rc
= get_user(opt
, (int __user
*)optval
);
1063 if (opt
> LLC_OPT_MAX_RETRY
)
1068 if (opt
> LLC_OPT_MAX_SIZE
)
1072 case LLC_OPT_ACK_TMR_EXP
:
1073 if (opt
> LLC_OPT_MAX_ACK_TMR_EXP
)
1075 llc
->ack_timer
.expire
= opt
* HZ
;
1077 case LLC_OPT_P_TMR_EXP
:
1078 if (opt
> LLC_OPT_MAX_P_TMR_EXP
)
1080 llc
->pf_cycle_timer
.expire
= opt
* HZ
;
1082 case LLC_OPT_REJ_TMR_EXP
:
1083 if (opt
> LLC_OPT_MAX_REJ_TMR_EXP
)
1085 llc
->rej_sent_timer
.expire
= opt
* HZ
;
1087 case LLC_OPT_BUSY_TMR_EXP
:
1088 if (opt
> LLC_OPT_MAX_BUSY_TMR_EXP
)
1090 llc
->busy_state_timer
.expire
= opt
* HZ
;
1092 case LLC_OPT_TX_WIN
:
1093 if (opt
> LLC_OPT_MAX_WIN
)
1097 case LLC_OPT_RX_WIN
:
1098 if (opt
> LLC_OPT_MAX_WIN
)
1102 case LLC_OPT_PKTINFO
:
1104 llc
->cmsg_flags
|= LLC_CMSG_PKTINFO
;
1106 llc
->cmsg_flags
&= ~LLC_CMSG_PKTINFO
;
1119 * llc_ui_getsockopt - get connection specific socket info
1120 * @sock: Socket to get information from.
1121 * @level: Socket level user is requesting operations on.
1122 * @optname: Operation name.
1123 * @optval: Variable to return operation data in.
1124 * @optlen: Length of optval.
1126 * Get connection specific socket information.
1128 static int llc_ui_getsockopt(struct socket
*sock
, int level
, int optname
,
1129 char __user
*optval
, int __user
*optlen
)
1131 struct sock
*sk
= sock
->sk
;
1132 struct llc_sock
*llc
= llc_sk(sk
);
1133 int val
= 0, len
= 0, rc
= -EINVAL
;
1136 if (unlikely(level
!= SOL_LLC
))
1138 rc
= get_user(len
, optlen
);
1142 if (len
!= sizeof(int))
1146 val
= llc
->n2
; break;
1148 val
= llc
->n1
; break;
1149 case LLC_OPT_ACK_TMR_EXP
:
1150 val
= llc
->ack_timer
.expire
/ HZ
; break;
1151 case LLC_OPT_P_TMR_EXP
:
1152 val
= llc
->pf_cycle_timer
.expire
/ HZ
; break;
1153 case LLC_OPT_REJ_TMR_EXP
:
1154 val
= llc
->rej_sent_timer
.expire
/ HZ
; break;
1155 case LLC_OPT_BUSY_TMR_EXP
:
1156 val
= llc
->busy_state_timer
.expire
/ HZ
; break;
1157 case LLC_OPT_TX_WIN
:
1158 val
= llc
->k
; break;
1159 case LLC_OPT_RX_WIN
:
1160 val
= llc
->rw
; break;
1161 case LLC_OPT_PKTINFO
:
1162 val
= (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) != 0;
1169 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
1176 static const struct net_proto_family llc_ui_family_ops
= {
1178 .create
= llc_ui_create
,
1179 .owner
= THIS_MODULE
,
1182 static const struct proto_ops llc_ui_ops
= {
1184 .owner
= THIS_MODULE
,
1185 .release
= llc_ui_release
,
1186 .bind
= llc_ui_bind
,
1187 .connect
= llc_ui_connect
,
1188 .socketpair
= sock_no_socketpair
,
1189 .accept
= llc_ui_accept
,
1190 .getname
= llc_ui_getname
,
1191 .poll
= datagram_poll
,
1192 .ioctl
= llc_ui_ioctl
,
1193 .listen
= llc_ui_listen
,
1194 .shutdown
= llc_ui_shutdown
,
1195 .setsockopt
= llc_ui_setsockopt
,
1196 .getsockopt
= llc_ui_getsockopt
,
1197 .sendmsg
= llc_ui_sendmsg
,
1198 .recvmsg
= llc_ui_recvmsg
,
1199 .mmap
= sock_no_mmap
,
1200 .sendpage
= sock_no_sendpage
,
1203 static const char llc_proc_err_msg
[] __initconst
=
1204 KERN_CRIT
"LLC: Unable to register the proc_fs entries\n";
1205 static const char llc_sysctl_err_msg
[] __initconst
=
1206 KERN_CRIT
"LLC: Unable to register the sysctl entries\n";
1207 static const char llc_sock_err_msg
[] __initconst
=
1208 KERN_CRIT
"LLC: Unable to register the network family\n";
1210 static int __init
llc2_init(void)
1212 int rc
= proto_register(&llc_proto
, 0);
1217 llc_build_offset_table();
1219 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
1220 rc
= llc_proc_init();
1222 printk(llc_proc_err_msg
);
1225 rc
= llc_sysctl_init();
1227 printk(llc_sysctl_err_msg
);
1230 rc
= sock_register(&llc_ui_family_ops
);
1232 printk(llc_sock_err_msg
);
1235 llc_add_pack(LLC_DEST_SAP
, llc_sap_handler
);
1236 llc_add_pack(LLC_DEST_CONN
, llc_conn_handler
);
1245 proto_unregister(&llc_proto
);
1249 static void __exit
llc2_exit(void)
1252 llc_remove_pack(LLC_DEST_SAP
);
1253 llc_remove_pack(LLC_DEST_CONN
);
1254 sock_unregister(PF_LLC
);
1257 proto_unregister(&llc_proto
);
1260 module_init(llc2_init
);
1261 module_exit(llc2_exit
);
1263 MODULE_LICENSE("GPL");
1264 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1265 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1266 MODULE_ALIAS_NETPROTO(PF_LLC
);