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...) do {} while (0)
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
);
236 * llc_ui_autoport - provide dynamically allocate SAP number
238 * Provide the caller with a dynamically allocated SAP number according
239 * to the rules that are set in this function. Returns: 0, upon failure,
240 * SAP number otherwise.
242 static int llc_ui_autoport(void)
247 while (tries
< LLC_SAP_DYN_TRIES
) {
248 for (i
= llc_ui_sap_last_autoport
;
249 i
< LLC_SAP_DYN_STOP
; i
+= 2) {
250 sap
= llc_sap_find(i
);
252 llc_ui_sap_last_autoport
= i
+ 2;
257 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
266 * llc_ui_autobind - automatically bind a socket to a sap
267 * @sock: socket to bind
268 * @addr: address to connect to
270 * Used by llc_ui_connect and llc_ui_sendmsg when the user hasn't
271 * specifically used llc_ui_bind to bind to an specific address/sap
273 * Returns: 0 upon success, negative otherwise.
275 static int llc_ui_autobind(struct socket
*sock
, struct sockaddr_llc
*addr
)
277 struct sock
*sk
= sock
->sk
;
278 struct llc_sock
*llc
= llc_sk(sk
);
282 if (!sock_flag(sk
, SOCK_ZAPPED
))
284 if (!addr
->sllc_arphrd
)
285 addr
->sllc_arphrd
= ARPHRD_ETHER
;
286 if (addr
->sllc_arphrd
!= ARPHRD_ETHER
)
289 if (sk
->sk_bound_dev_if
) {
290 llc
->dev
= dev_get_by_index(&init_net
, sk
->sk_bound_dev_if
);
291 if (llc
->dev
&& addr
->sllc_arphrd
!= llc
->dev
->type
) {
296 llc
->dev
= dev_getfirstbyhwtype(&init_net
, addr
->sllc_arphrd
);
300 llc
->laddr
.lsap
= llc_ui_autoport();
301 if (!llc
->laddr
.lsap
)
303 rc
= -EBUSY
; /* some other network layer is using the sap */
304 sap
= llc_sap_open(llc
->laddr
.lsap
, NULL
);
307 memcpy(llc
->laddr
.mac
, llc
->dev
->dev_addr
, IFHWADDRLEN
);
308 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
309 /* assign new connection to its SAP */
310 llc_sap_add_socket(sap
, sk
);
311 sock_reset_flag(sk
, SOCK_ZAPPED
);
318 * llc_ui_bind - bind a socket to a specific address.
319 * @sock: Socket to bind an address to.
320 * @uaddr: Address the user wants the socket bound to.
321 * @addrlen: Length of the uaddr structure.
323 * Bind a socket to a specific address. For llc a user is able to bind to
324 * a specific sap only or mac + sap.
325 * If the user desires to bind to a specific mac + sap, it is possible to
326 * have multiple sap connections via multiple macs.
327 * Bind and autobind for that matter must enforce the correct sap usage
328 * otherwise all hell will break loose.
329 * Returns: 0 upon success, negative otherwise.
331 static int llc_ui_bind(struct socket
*sock
, struct sockaddr
*uaddr
, int addrlen
)
333 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
334 struct sock
*sk
= sock
->sk
;
335 struct llc_sock
*llc
= llc_sk(sk
);
340 if (unlikely(!sock_flag(sk
, SOCK_ZAPPED
) || addrlen
!= sizeof(*addr
)))
343 if (!addr
->sllc_arphrd
)
344 addr
->sllc_arphrd
= ARPHRD_ETHER
;
345 if (unlikely(addr
->sllc_family
!= AF_LLC
|| addr
->sllc_arphrd
!= ARPHRD_ETHER
))
347 dprintk("%s: binding %02X\n", __func__
, addr
->sllc_sap
);
350 if (sk
->sk_bound_dev_if
) {
351 llc
->dev
= dev_get_by_index_rcu(&init_net
, sk
->sk_bound_dev_if
);
353 if (is_zero_ether_addr(addr
->sllc_mac
))
354 memcpy(addr
->sllc_mac
, llc
->dev
->dev_addr
,
356 if (addr
->sllc_arphrd
!= llc
->dev
->type
||
357 !ether_addr_equal(addr
->sllc_mac
,
358 llc
->dev
->dev_addr
)) {
364 llc
->dev
= dev_getbyhwaddr_rcu(&init_net
, addr
->sllc_arphrd
,
371 if (!addr
->sllc_sap
) {
373 addr
->sllc_sap
= llc_ui_autoport();
377 sap
= llc_sap_find(addr
->sllc_sap
);
379 sap
= llc_sap_open(addr
->sllc_sap
, NULL
);
380 rc
= -EBUSY
; /* some other network layer is using the sap */
384 struct llc_addr laddr
, daddr
;
387 memset(&laddr
, 0, sizeof(laddr
));
388 memset(&daddr
, 0, sizeof(daddr
));
390 * FIXME: check if the address is multicast,
391 * only SOCK_DGRAM can do this.
393 memcpy(laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
394 laddr
.lsap
= addr
->sllc_sap
;
395 rc
= -EADDRINUSE
; /* mac + sap clash. */
396 ask
= llc_lookup_established(sap
, &daddr
, &laddr
);
402 llc
->laddr
.lsap
= addr
->sllc_sap
;
403 memcpy(llc
->laddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
404 memcpy(&llc
->addr
, addr
, sizeof(llc
->addr
));
405 /* assign new connection to its SAP */
406 llc_sap_add_socket(sap
, sk
);
407 sock_reset_flag(sk
, SOCK_ZAPPED
);
417 * llc_ui_shutdown - shutdown a connect llc2 socket.
418 * @sock: Socket to shutdown.
419 * @how: What part of the socket to shutdown.
421 * Shutdown a connected llc2 socket. Currently this function only supports
422 * shutting down both sends and receives (2), we could probably make this
423 * function such that a user can shutdown only half the connection but not
425 * Returns: 0 upon success, negative otherwise.
427 static int llc_ui_shutdown(struct socket
*sock
, int how
)
429 struct sock
*sk
= sock
->sk
;
433 if (unlikely(sk
->sk_state
!= TCP_ESTABLISHED
))
438 rc
= llc_send_disc(sk
);
440 rc
= llc_ui_wait_for_disc(sk
, sk
->sk_rcvtimeo
);
441 /* Wake up anyone sleeping in poll */
442 sk
->sk_state_change(sk
);
449 * llc_ui_connect - Connect to a remote llc2 mac + sap.
450 * @sock: Socket which will be connected to the remote destination.
451 * @uaddr: Remote and possibly the local address of the new connection.
452 * @addrlen: Size of uaddr structure.
453 * @flags: Operational flags specified by the user.
455 * Connect to a remote llc2 mac + sap. The caller must specify the
456 * destination mac and address to connect to. If the user hasn't previously
457 * called bind(2) with a smac the address of the first interface of the
458 * specified arp type will be used.
459 * This function will autobind if user did not previously call bind.
460 * Returns: 0 upon success, negative otherwise.
462 static int llc_ui_connect(struct socket
*sock
, struct sockaddr
*uaddr
,
463 int addrlen
, int flags
)
465 struct sock
*sk
= sock
->sk
;
466 struct llc_sock
*llc
= llc_sk(sk
);
467 struct sockaddr_llc
*addr
= (struct sockaddr_llc
*)uaddr
;
471 if (unlikely(addrlen
!= sizeof(*addr
)))
474 if (unlikely(addr
->sllc_family
!= AF_LLC
))
476 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
479 if (unlikely(sock
->state
== SS_CONNECTING
))
481 /* bind connection to sap if user hasn't done it. */
482 if (sock_flag(sk
, SOCK_ZAPPED
)) {
483 /* bind to sap with null dev, exclusive */
484 rc
= llc_ui_autobind(sock
, addr
);
488 llc
->daddr
.lsap
= addr
->sllc_sap
;
489 memcpy(llc
->daddr
.mac
, addr
->sllc_mac
, IFHWADDRLEN
);
490 sock
->state
= SS_CONNECTING
;
491 sk
->sk_state
= TCP_SYN_SENT
;
492 llc
->link
= llc_ui_next_link_no(llc
->sap
->laddr
.lsap
);
493 rc
= llc_establish_connection(sk
, llc
->dev
->dev_addr
,
494 addr
->sllc_mac
, addr
->sllc_sap
);
496 dprintk("%s: llc_ui_send_conn failed :-(\n", __func__
);
497 sock
->state
= SS_UNCONNECTED
;
498 sk
->sk_state
= TCP_CLOSE
;
502 if (sk
->sk_state
== TCP_SYN_SENT
) {
503 const long timeo
= sock_sndtimeo(sk
, flags
& O_NONBLOCK
);
505 if (!timeo
|| !llc_ui_wait_for_conn(sk
, timeo
))
508 rc
= sock_intr_errno(timeo
);
509 if (signal_pending(current
))
513 if (sk
->sk_state
== TCP_CLOSE
)
516 sock
->state
= SS_CONNECTED
;
522 rc
= sock_error(sk
) ? : -ECONNABORTED
;
523 sock
->state
= SS_UNCONNECTED
;
528 * llc_ui_listen - allow a normal socket to accept incoming connections
529 * @sock: Socket to allow incoming connections on.
530 * @backlog: Number of connections to queue.
532 * Allow a normal socket to accept incoming connections.
533 * Returns 0 upon success, negative otherwise.
535 static int llc_ui_listen(struct socket
*sock
, int backlog
)
537 struct sock
*sk
= sock
->sk
;
541 if (unlikely(sock
->state
!= SS_UNCONNECTED
))
544 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
547 if (sock_flag(sk
, SOCK_ZAPPED
))
550 if (!(unsigned int)backlog
) /* BSDism */
552 sk
->sk_max_ack_backlog
= backlog
;
553 if (sk
->sk_state
!= TCP_LISTEN
) {
554 sk
->sk_ack_backlog
= 0;
555 sk
->sk_state
= TCP_LISTEN
;
557 sk
->sk_socket
->flags
|= __SO_ACCEPTCON
;
563 static int llc_ui_wait_for_disc(struct sock
*sk
, long timeout
)
565 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
568 add_wait_queue(sk_sleep(sk
), &wait
);
570 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
== TCP_CLOSE
, &wait
))
573 if (signal_pending(current
))
580 remove_wait_queue(sk_sleep(sk
), &wait
);
584 static bool llc_ui_wait_for_conn(struct sock
*sk
, long timeout
)
586 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
588 add_wait_queue(sk_sleep(sk
), &wait
);
590 if (sk_wait_event(sk
, &timeout
, sk
->sk_state
!= TCP_SYN_SENT
, &wait
))
592 if (signal_pending(current
) || !timeout
)
595 remove_wait_queue(sk_sleep(sk
), &wait
);
599 static int llc_ui_wait_for_busy_core(struct sock
*sk
, long timeout
)
601 DEFINE_WAIT_FUNC(wait
, woken_wake_function
);
602 struct llc_sock
*llc
= llc_sk(sk
);
605 add_wait_queue(sk_sleep(sk
), &wait
);
608 if (sk_wait_event(sk
, &timeout
,
609 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
610 (!llc_data_accept_state(llc
->state
) &&
611 !llc
->remote_busy_flag
&&
612 !llc
->p_flag
), &wait
))
615 if (signal_pending(current
))
621 remove_wait_queue(sk_sleep(sk
), &wait
);
625 static int llc_wait_data(struct sock
*sk
, long timeo
)
631 * POSIX 1003.1g mandates this order.
637 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
642 rc
= sock_intr_errno(timeo
);
643 if (signal_pending(current
))
646 if (sk_wait_data(sk
, &timeo
, NULL
))
652 static void llc_cmsg_rcv(struct msghdr
*msg
, struct sk_buff
*skb
)
654 struct llc_sock
*llc
= llc_sk(skb
->sk
);
656 if (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) {
657 struct llc_pktinfo info
;
659 memset(&info
, 0, sizeof(info
));
660 info
.lpi_ifindex
= llc_sk(skb
->sk
)->dev
->ifindex
;
661 llc_pdu_decode_dsap(skb
, &info
.lpi_sap
);
662 llc_pdu_decode_da(skb
, info
.lpi_mac
);
663 put_cmsg(msg
, SOL_LLC
, LLC_OPT_PKTINFO
, sizeof(info
), &info
);
668 * llc_ui_accept - accept a new incoming connection.
669 * @sock: Socket which connections arrive on.
670 * @newsock: Socket to move incoming connection to.
671 * @flags: User specified operational flags.
672 * @kern: If the socket is kernel internal
674 * Accept a new incoming connection.
675 * Returns 0 upon success, negative otherwise.
677 static int llc_ui_accept(struct socket
*sock
, struct socket
*newsock
, int flags
,
680 struct sock
*sk
= sock
->sk
, *newsk
;
681 struct llc_sock
*llc
, *newllc
;
683 int rc
= -EOPNOTSUPP
;
685 dprintk("%s: accepting on %02X\n", __func__
,
686 llc_sk(sk
)->laddr
.lsap
);
688 if (unlikely(sk
->sk_type
!= SOCK_STREAM
))
691 if (unlikely(sock
->state
!= SS_UNCONNECTED
||
692 sk
->sk_state
!= TCP_LISTEN
))
694 /* wait for a connection to arrive. */
695 if (skb_queue_empty(&sk
->sk_receive_queue
)) {
696 rc
= llc_wait_data(sk
, sk
->sk_rcvtimeo
);
700 dprintk("%s: got a new connection on %02X\n", __func__
,
701 llc_sk(sk
)->laddr
.lsap
);
702 skb
= skb_dequeue(&sk
->sk_receive_queue
);
708 /* attach connection to a new socket. */
709 llc_ui_sk_init(newsock
, newsk
);
710 sock_reset_flag(newsk
, SOCK_ZAPPED
);
711 newsk
->sk_state
= TCP_ESTABLISHED
;
712 newsock
->state
= SS_CONNECTED
;
714 newllc
= llc_sk(newsk
);
715 memcpy(&newllc
->addr
, &llc
->addr
, sizeof(newllc
->addr
));
716 newllc
->link
= llc_ui_next_link_no(newllc
->laddr
.lsap
);
718 /* put original socket back into a clean listen state. */
719 sk
->sk_state
= TCP_LISTEN
;
720 sk_acceptq_removed(sk
);
721 dprintk("%s: ok success on %02X, client on %02X\n", __func__
,
722 llc_sk(sk
)->addr
.sllc_sap
, newllc
->daddr
.lsap
);
731 * llc_ui_recvmsg - copy received data to the socket user.
732 * @sock: Socket to copy data from.
733 * @msg: Various user space related information.
734 * @len: Size of user buffer.
735 * @flags: User specified flags.
737 * Copy received data to the socket user.
738 * Returns non-negative upon success, negative otherwise.
740 static int llc_ui_recvmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
,
743 DECLARE_SOCKADDR(struct sockaddr_llc
*, uaddr
, msg
->msg_name
);
744 const int nonblock
= flags
& MSG_DONTWAIT
;
745 struct sk_buff
*skb
= NULL
;
746 struct sock
*sk
= sock
->sk
;
747 struct llc_sock
*llc
= llc_sk(sk
);
752 int target
; /* Read at least this many bytes */
757 if (unlikely(sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_LISTEN
))
760 timeo
= sock_rcvtimeo(sk
, nonblock
);
762 seq
= &llc
->copied_seq
;
763 if (flags
& MSG_PEEK
) {
764 peek_seq
= llc
->copied_seq
;
768 target
= sock_rcvlowat(sk
, flags
& MSG_WAITALL
, len
);
775 * We need to check signals first, to get correct SIGURG
776 * handling. FIXME: Need to check this doesn't impact 1003.1g
777 * and move it down to the bottom of the loop
779 if (signal_pending(current
)) {
782 copied
= timeo
? sock_intr_errno(timeo
) : -EAGAIN
;
786 /* Next get a buffer. */
788 skb
= skb_peek(&sk
->sk_receive_queue
);
793 /* Well, if we have backlog, try to process it now yet. */
795 if (copied
>= target
&& !READ_ONCE(sk
->sk_backlog
.tail
))
800 sk
->sk_state
== TCP_CLOSE
||
801 (sk
->sk_shutdown
& RCV_SHUTDOWN
) ||
806 if (sock_flag(sk
, SOCK_DONE
))
810 copied
= sock_error(sk
);
813 if (sk
->sk_shutdown
& RCV_SHUTDOWN
)
816 if (sk
->sk_type
== SOCK_STREAM
&& sk
->sk_state
== TCP_CLOSE
) {
817 if (!sock_flag(sk
, SOCK_DONE
)) {
819 * This occurs when user tries to read
820 * from never connected socket.
833 if (copied
>= target
) { /* Do not sleep, just process backlog. */
837 sk_wait_data(sk
, &timeo
, NULL
);
839 if ((flags
& MSG_PEEK
) && peek_seq
!= llc
->copied_seq
) {
840 net_dbg_ratelimited("LLC(%s:%d): Application bug, race in MSG_PEEK\n",
842 task_pid_nr(current
));
843 peek_seq
= llc
->copied_seq
;
848 /* Ok so how much can we use? */
849 used
= skb
->len
- offset
;
853 if (!(flags
& MSG_TRUNC
)) {
854 int rc
= skb_copy_datagram_msg(skb
, offset
, msg
, used
);
856 /* Exception. Bailout! */
867 /* For non stream protcols we get one packet per recvmsg call */
868 if (sk
->sk_type
!= SOCK_STREAM
)
871 if (!(flags
& MSG_PEEK
)) {
872 skb_unlink(skb
, &sk
->sk_receive_queue
);
878 if (used
+ offset
< skb_len
)
886 if (uaddr
!= NULL
&& skb
!= NULL
) {
887 memcpy(uaddr
, llc_ui_skb_cb(skb
), sizeof(*uaddr
));
888 msg
->msg_namelen
= sizeof(*uaddr
);
890 if (llc_sk(sk
)->cmsg_flags
)
891 llc_cmsg_rcv(msg
, skb
);
893 if (!(flags
& MSG_PEEK
)) {
894 skb_unlink(skb
, &sk
->sk_receive_queue
);
903 * llc_ui_sendmsg - Transmit data provided by the socket user.
904 * @sock: Socket to transmit data from.
905 * @msg: Various user related information.
906 * @len: Length of data to transmit.
908 * Transmit data provided by the socket user.
909 * Returns non-negative upon success, negative otherwise.
911 static int llc_ui_sendmsg(struct socket
*sock
, struct msghdr
*msg
, size_t len
)
913 struct sock
*sk
= sock
->sk
;
914 struct llc_sock
*llc
= llc_sk(sk
);
915 DECLARE_SOCKADDR(struct sockaddr_llc
*, addr
, msg
->msg_name
);
916 int flags
= msg
->msg_flags
;
917 int noblock
= flags
& MSG_DONTWAIT
;
918 struct sk_buff
*skb
= NULL
;
920 int rc
= -EINVAL
, copied
= 0, hdrlen
;
922 dprintk("%s: sending from %02X to %02X\n", __func__
,
923 llc
->laddr
.lsap
, llc
->daddr
.lsap
);
926 if (msg
->msg_namelen
< sizeof(*addr
))
929 if (llc_ui_addr_null(&llc
->addr
))
933 /* must bind connection to sap if user hasn't done it. */
934 if (sock_flag(sk
, SOCK_ZAPPED
)) {
935 /* bind to sap with null dev, exclusive. */
936 rc
= llc_ui_autobind(sock
, addr
);
940 hdrlen
= llc
->dev
->hard_header_len
+ llc_ui_header_len(sk
, addr
);
942 if (size
> llc
->dev
->mtu
)
943 size
= llc
->dev
->mtu
;
944 copied
= size
- hdrlen
;
949 skb
= sock_alloc_send_skb(sk
, size
, noblock
, &rc
);
954 skb
->protocol
= llc_proto_type(addr
->sllc_arphrd
);
955 skb_reserve(skb
, hdrlen
);
956 rc
= memcpy_from_msg(skb_put(skb
, copied
), msg
, copied
);
959 if (sk
->sk_type
== SOCK_DGRAM
|| addr
->sllc_ua
) {
960 llc_build_and_send_ui_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
965 if (addr
->sllc_test
) {
966 llc_build_and_send_test_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
971 if (addr
->sllc_xid
) {
972 llc_build_and_send_xid_pkt(llc
->sap
, skb
, addr
->sllc_mac
,
978 if (!(sk
->sk_type
== SOCK_STREAM
&& !addr
->sllc_ua
))
980 rc
= llc_ui_send_data(sk
, skb
, noblock
);
985 dprintk("%s: failed sending from %02X to %02X: %d\n",
986 __func__
, llc
->laddr
.lsap
, llc
->daddr
.lsap
, rc
);
988 return rc
? : copied
;
992 * llc_ui_getname - return the address info of a socket
993 * @sock: Socket to get address of.
994 * @uaddr: Address structure to return information.
995 * @peer: Does user want local or remote address information.
997 * Return the address information of a socket.
999 static int llc_ui_getname(struct socket
*sock
, struct sockaddr
*uaddr
,
1002 struct sockaddr_llc sllc
;
1003 struct sock
*sk
= sock
->sk
;
1004 struct llc_sock
*llc
= llc_sk(sk
);
1007 memset(&sllc
, 0, sizeof(sllc
));
1009 if (sock_flag(sk
, SOCK_ZAPPED
))
1013 if (sk
->sk_state
!= TCP_ESTABLISHED
)
1016 sllc
.sllc_arphrd
= llc
->dev
->type
;
1017 sllc
.sllc_sap
= llc
->daddr
.lsap
;
1018 memcpy(&sllc
.sllc_mac
, &llc
->daddr
.mac
, IFHWADDRLEN
);
1023 sllc
.sllc_sap
= llc
->sap
->laddr
.lsap
;
1026 sllc
.sllc_arphrd
= llc
->dev
->type
;
1027 memcpy(&sllc
.sllc_mac
, llc
->dev
->dev_addr
,
1031 sllc
.sllc_family
= AF_LLC
;
1032 memcpy(uaddr
, &sllc
, sizeof(sllc
));
1040 * llc_ui_ioctl - io controls for PF_LLC
1041 * @sock: Socket to get/set info
1043 * @arg: optional argument for cmd
1045 * get/set info on llc sockets
1047 static int llc_ui_ioctl(struct socket
*sock
, unsigned int cmd
,
1050 return -ENOIOCTLCMD
;
1054 * llc_ui_setsockopt - set various connection specific parameters.
1055 * @sock: Socket to set options on.
1056 * @level: Socket level user is requesting operations on.
1057 * @optname: Operation name.
1058 * @optval: User provided operation data.
1059 * @optlen: Length of optval.
1061 * Set various connection specific parameters.
1063 static int llc_ui_setsockopt(struct socket
*sock
, int level
, int optname
,
1064 sockptr_t optval
, unsigned int optlen
)
1066 struct sock
*sk
= sock
->sk
;
1067 struct llc_sock
*llc
= llc_sk(sk
);
1072 if (unlikely(level
!= SOL_LLC
|| optlen
!= sizeof(int)))
1074 rc
= copy_from_sockptr(&opt
, optval
, sizeof(opt
));
1080 if (opt
> LLC_OPT_MAX_RETRY
)
1085 if (opt
> LLC_OPT_MAX_SIZE
)
1089 case LLC_OPT_ACK_TMR_EXP
:
1090 if (opt
> LLC_OPT_MAX_ACK_TMR_EXP
)
1092 llc
->ack_timer
.expire
= opt
* HZ
;
1094 case LLC_OPT_P_TMR_EXP
:
1095 if (opt
> LLC_OPT_MAX_P_TMR_EXP
)
1097 llc
->pf_cycle_timer
.expire
= opt
* HZ
;
1099 case LLC_OPT_REJ_TMR_EXP
:
1100 if (opt
> LLC_OPT_MAX_REJ_TMR_EXP
)
1102 llc
->rej_sent_timer
.expire
= opt
* HZ
;
1104 case LLC_OPT_BUSY_TMR_EXP
:
1105 if (opt
> LLC_OPT_MAX_BUSY_TMR_EXP
)
1107 llc
->busy_state_timer
.expire
= opt
* HZ
;
1109 case LLC_OPT_TX_WIN
:
1110 if (opt
> LLC_OPT_MAX_WIN
)
1114 case LLC_OPT_RX_WIN
:
1115 if (opt
> LLC_OPT_MAX_WIN
)
1119 case LLC_OPT_PKTINFO
:
1121 llc
->cmsg_flags
|= LLC_CMSG_PKTINFO
;
1123 llc
->cmsg_flags
&= ~LLC_CMSG_PKTINFO
;
1136 * llc_ui_getsockopt - get connection specific socket info
1137 * @sock: Socket to get information from.
1138 * @level: Socket level user is requesting operations on.
1139 * @optname: Operation name.
1140 * @optval: Variable to return operation data in.
1141 * @optlen: Length of optval.
1143 * Get connection specific socket information.
1145 static int llc_ui_getsockopt(struct socket
*sock
, int level
, int optname
,
1146 char __user
*optval
, int __user
*optlen
)
1148 struct sock
*sk
= sock
->sk
;
1149 struct llc_sock
*llc
= llc_sk(sk
);
1150 int val
= 0, len
= 0, rc
= -EINVAL
;
1153 if (unlikely(level
!= SOL_LLC
))
1155 rc
= get_user(len
, optlen
);
1159 if (len
!= sizeof(int))
1163 val
= llc
->n2
; break;
1165 val
= llc
->n1
; break;
1166 case LLC_OPT_ACK_TMR_EXP
:
1167 val
= llc
->ack_timer
.expire
/ HZ
; break;
1168 case LLC_OPT_P_TMR_EXP
:
1169 val
= llc
->pf_cycle_timer
.expire
/ HZ
; break;
1170 case LLC_OPT_REJ_TMR_EXP
:
1171 val
= llc
->rej_sent_timer
.expire
/ HZ
; break;
1172 case LLC_OPT_BUSY_TMR_EXP
:
1173 val
= llc
->busy_state_timer
.expire
/ HZ
; break;
1174 case LLC_OPT_TX_WIN
:
1175 val
= llc
->k
; break;
1176 case LLC_OPT_RX_WIN
:
1177 val
= llc
->rw
; break;
1178 case LLC_OPT_PKTINFO
:
1179 val
= (llc
->cmsg_flags
& LLC_CMSG_PKTINFO
) != 0;
1186 if (put_user(len
, optlen
) || copy_to_user(optval
, &val
, len
))
1193 static const struct net_proto_family llc_ui_family_ops
= {
1195 .create
= llc_ui_create
,
1196 .owner
= THIS_MODULE
,
1199 static const struct proto_ops llc_ui_ops
= {
1201 .owner
= THIS_MODULE
,
1202 .release
= llc_ui_release
,
1203 .bind
= llc_ui_bind
,
1204 .connect
= llc_ui_connect
,
1205 .socketpair
= sock_no_socketpair
,
1206 .accept
= llc_ui_accept
,
1207 .getname
= llc_ui_getname
,
1208 .poll
= datagram_poll
,
1209 .ioctl
= llc_ui_ioctl
,
1210 .listen
= llc_ui_listen
,
1211 .shutdown
= llc_ui_shutdown
,
1212 .setsockopt
= llc_ui_setsockopt
,
1213 .getsockopt
= llc_ui_getsockopt
,
1214 .sendmsg
= llc_ui_sendmsg
,
1215 .recvmsg
= llc_ui_recvmsg
,
1216 .mmap
= sock_no_mmap
,
1217 .sendpage
= sock_no_sendpage
,
1220 static const char llc_proc_err_msg
[] __initconst
=
1221 KERN_CRIT
"LLC: Unable to register the proc_fs entries\n";
1222 static const char llc_sysctl_err_msg
[] __initconst
=
1223 KERN_CRIT
"LLC: Unable to register the sysctl entries\n";
1224 static const char llc_sock_err_msg
[] __initconst
=
1225 KERN_CRIT
"LLC: Unable to register the network family\n";
1227 static int __init
llc2_init(void)
1229 int rc
= proto_register(&llc_proto
, 0);
1234 llc_build_offset_table();
1236 llc_ui_sap_last_autoport
= LLC_SAP_DYN_START
;
1237 rc
= llc_proc_init();
1239 printk(llc_proc_err_msg
);
1242 rc
= llc_sysctl_init();
1244 printk(llc_sysctl_err_msg
);
1247 rc
= sock_register(&llc_ui_family_ops
);
1249 printk(llc_sock_err_msg
);
1252 llc_add_pack(LLC_DEST_SAP
, llc_sap_handler
);
1253 llc_add_pack(LLC_DEST_CONN
, llc_conn_handler
);
1262 proto_unregister(&llc_proto
);
1266 static void __exit
llc2_exit(void)
1269 llc_remove_pack(LLC_DEST_SAP
);
1270 llc_remove_pack(LLC_DEST_CONN
);
1271 sock_unregister(PF_LLC
);
1274 proto_unregister(&llc_proto
);
1277 module_init(llc2_init
);
1278 module_exit(llc2_exit
);
1280 MODULE_LICENSE("GPL");
1281 MODULE_AUTHOR("Procom 1997, Jay Schullist 2001, Arnaldo C. Melo 2001-2003");
1282 MODULE_DESCRIPTION("IEEE 802.2 PF_LLC support");
1283 MODULE_ALIAS_NETPROTO(PF_LLC
);