1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2010-2011 EIA Electronics,
3 // Pieter Beyens <pieter.beyens@eia.be>
4 // Copyright (c) 2010-2011 EIA Electronics,
5 // Kurt Van Dijck <kurt.van.dijck@eia.be>
6 // Copyright (c) 2018 Protonic,
7 // Robin van der Gracht <robin@protonic.nl>
8 // Copyright (c) 2017-2019 Pengutronix,
9 // Marc Kleine-Budde <kernel@pengutronix.de>
10 // Copyright (c) 2017-2019 Pengutronix,
11 // Oleksij Rempel <kernel@pengutronix.de>
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
15 #include <linux/can/can-ml.h>
16 #include <linux/can/core.h>
17 #include <linux/can/skb.h>
18 #include <linux/errqueue.h>
19 #include <linux/if_arp.h>
21 #include "j1939-priv.h"
23 #define J1939_MIN_NAMELEN CAN_REQUIRED_SIZE(struct sockaddr_can, can_addr.j1939)
25 /* conversion function between struct sock::sk_priority from linux and
26 * j1939 priority field
28 static inline priority_t j1939_prio(u32 sk_priority)
30 sk_priority = min(sk_priority, 7U);
32 return 7 - sk_priority;
35 static inline u32 j1939_to_sk_priority(priority_t prio)
40 /* function to see if pgn is to be evaluated */
41 static inline bool j1939_pgn_is_valid(pgn_t pgn)
43 return pgn <= J1939_PGN_MAX;
46 /* test function to avoid non-zero DA placeholder for pdu1 pgn's */
47 static inline bool j1939_pgn_is_clean_pdu(pgn_t pgn)
49 if (j1939_pgn_is_pdu1(pgn))
55 static inline void j1939_sock_pending_add(struct sock *sk)
57 struct j1939_sock *jsk = j1939_sk(sk);
59 atomic_inc(&jsk->skb_pending);
62 static int j1939_sock_pending_get(struct sock *sk)
64 struct j1939_sock *jsk = j1939_sk(sk);
66 return atomic_read(&jsk->skb_pending);
69 void j1939_sock_pending_del(struct sock *sk)
71 struct j1939_sock *jsk = j1939_sk(sk);
73 /* atomic_dec_return returns the new value */
74 if (!atomic_dec_return(&jsk->skb_pending))
75 wake_up(&jsk->waitq); /* no pending SKB's */
78 static void j1939_jsk_add(struct j1939_priv *priv, struct j1939_sock *jsk)
80 jsk->state |= J1939_SOCK_BOUND;
83 spin_lock_bh(&priv->j1939_socks_lock);
84 list_add_tail(&jsk->list, &priv->j1939_socks);
85 spin_unlock_bh(&priv->j1939_socks_lock);
88 static void j1939_jsk_del(struct j1939_priv *priv, struct j1939_sock *jsk)
90 spin_lock_bh(&priv->j1939_socks_lock);
91 list_del_init(&jsk->list);
92 spin_unlock_bh(&priv->j1939_socks_lock);
95 jsk->state &= ~J1939_SOCK_BOUND;
98 static bool j1939_sk_queue_session(struct j1939_session *session)
100 struct j1939_sock *jsk = j1939_sk(session->sk);
103 spin_lock_bh(&jsk->sk_session_queue_lock);
104 empty = list_empty(&jsk->sk_session_queue);
105 j1939_session_get(session);
106 list_add_tail(&session->sk_session_queue_entry, &jsk->sk_session_queue);
107 spin_unlock_bh(&jsk->sk_session_queue_lock);
108 j1939_sock_pending_add(&jsk->sk);
114 j1939_session *j1939_sk_get_incomplete_session(struct j1939_sock *jsk)
116 struct j1939_session *session = NULL;
118 spin_lock_bh(&jsk->sk_session_queue_lock);
119 if (!list_empty(&jsk->sk_session_queue)) {
120 session = list_last_entry(&jsk->sk_session_queue,
121 struct j1939_session,
122 sk_session_queue_entry);
123 if (session->total_queued_size == session->total_message_size)
126 j1939_session_get(session);
128 spin_unlock_bh(&jsk->sk_session_queue_lock);
133 static void j1939_sk_queue_drop_all(struct j1939_priv *priv,
134 struct j1939_sock *jsk, int err)
136 struct j1939_session *session, *tmp;
138 netdev_dbg(priv->ndev, "%s: err: %i\n", __func__, err);
139 spin_lock_bh(&jsk->sk_session_queue_lock);
140 list_for_each_entry_safe(session, tmp, &jsk->sk_session_queue,
141 sk_session_queue_entry) {
142 list_del_init(&session->sk_session_queue_entry);
144 j1939_session_put(session);
146 spin_unlock_bh(&jsk->sk_session_queue_lock);
149 static void j1939_sk_queue_activate_next_locked(struct j1939_session *session)
151 struct j1939_sock *jsk;
152 struct j1939_session *first;
155 /* RX-Session don't have a socket (yet) */
159 jsk = j1939_sk(session->sk);
160 lockdep_assert_held(&jsk->sk_session_queue_lock);
164 first = list_first_entry_or_null(&jsk->sk_session_queue,
165 struct j1939_session,
166 sk_session_queue_entry);
168 /* Some else has already activated the next session */
169 if (first != session)
173 list_del_init(&first->sk_session_queue_entry);
174 j1939_session_put(first);
175 first = list_first_entry_or_null(&jsk->sk_session_queue,
176 struct j1939_session,
177 sk_session_queue_entry);
181 if (WARN_ON_ONCE(j1939_session_activate(first))) {
185 /* Give receiver some time (arbitrary chosen) to recover */
189 time_ms = 10 + prandom_u32_max(16);
191 j1939_tp_schedule_txtimer(first, time_ms);
195 void j1939_sk_queue_activate_next(struct j1939_session *session)
197 struct j1939_sock *jsk;
202 jsk = j1939_sk(session->sk);
204 spin_lock_bh(&jsk->sk_session_queue_lock);
205 j1939_sk_queue_activate_next_locked(session);
206 spin_unlock_bh(&jsk->sk_session_queue_lock);
209 static bool j1939_sk_match_dst(struct j1939_sock *jsk,
210 const struct j1939_sk_buff_cb *skcb)
212 if ((jsk->state & J1939_SOCK_PROMISC))
215 /* Destination address filter */
216 if (jsk->addr.src_name && skcb->addr.dst_name) {
217 if (jsk->addr.src_name != skcb->addr.dst_name)
220 /* receive (all sockets) if
221 * - all packages that match our bind() address
222 * - all broadcast on a socket if SO_BROADCAST
225 if (j1939_address_is_unicast(skcb->addr.da)) {
226 if (jsk->addr.sa != skcb->addr.da)
228 } else if (!sock_flag(&jsk->sk, SOCK_BROADCAST)) {
229 /* receiving broadcast without SO_BROADCAST
230 * flag is not allowed
236 /* Source address filter */
237 if (jsk->state & J1939_SOCK_CONNECTED) {
238 /* receive (all sockets) if
239 * - all packages that match our connect() name or address
241 if (jsk->addr.dst_name && skcb->addr.src_name) {
242 if (jsk->addr.dst_name != skcb->addr.src_name)
245 if (jsk->addr.da != skcb->addr.sa)
251 if (j1939_pgn_is_valid(jsk->pgn_rx_filter) &&
252 jsk->pgn_rx_filter != skcb->addr.pgn)
258 /* matches skb control buffer (addr) with a j1939 filter */
259 static bool j1939_sk_match_filter(struct j1939_sock *jsk,
260 const struct j1939_sk_buff_cb *skcb)
262 const struct j1939_filter *f = jsk->filters;
263 int nfilter = jsk->nfilters;
266 /* receive all when no filters are assigned */
269 for (; nfilter; ++f, --nfilter) {
270 if ((skcb->addr.pgn & f->pgn_mask) != f->pgn)
272 if ((skcb->addr.sa & f->addr_mask) != f->addr)
274 if ((skcb->addr.src_name & f->name_mask) != f->name)
281 static bool j1939_sk_recv_match_one(struct j1939_sock *jsk,
282 const struct j1939_sk_buff_cb *skcb)
284 if (!(jsk->state & J1939_SOCK_BOUND))
287 if (!j1939_sk_match_dst(jsk, skcb))
290 if (!j1939_sk_match_filter(jsk, skcb))
296 static void j1939_sk_recv_one(struct j1939_sock *jsk, struct sk_buff *oskb)
298 const struct j1939_sk_buff_cb *oskcb = j1939_skb_to_cb(oskb);
299 struct j1939_sk_buff_cb *skcb;
302 if (oskb->sk == &jsk->sk)
305 if (!j1939_sk_recv_match_one(jsk, oskcb))
308 skb = skb_clone(oskb, GFP_ATOMIC);
310 pr_warn("skb clone failed\n");
313 can_skb_set_owner(skb, oskb->sk);
315 skcb = j1939_skb_to_cb(skb);
316 skcb->msg_flags &= ~(MSG_DONTROUTE);
318 skcb->msg_flags |= MSG_DONTROUTE;
320 if (sock_queue_rcv_skb(&jsk->sk, skb) < 0)
324 bool j1939_sk_recv_match(struct j1939_priv *priv, struct j1939_sk_buff_cb *skcb)
326 struct j1939_sock *jsk;
329 spin_lock_bh(&priv->j1939_socks_lock);
330 list_for_each_entry(jsk, &priv->j1939_socks, list) {
331 match = j1939_sk_recv_match_one(jsk, skcb);
335 spin_unlock_bh(&priv->j1939_socks_lock);
340 void j1939_sk_recv(struct j1939_priv *priv, struct sk_buff *skb)
342 struct j1939_sock *jsk;
344 spin_lock_bh(&priv->j1939_socks_lock);
345 list_for_each_entry(jsk, &priv->j1939_socks, list) {
346 j1939_sk_recv_one(jsk, skb);
348 spin_unlock_bh(&priv->j1939_socks_lock);
351 static void j1939_sk_sock_destruct(struct sock *sk)
353 struct j1939_sock *jsk = j1939_sk(sk);
355 /* This function will be call by the generic networking code, when then
356 * the socket is ultimately closed (sk->sk_destruct).
359 * - processing a received CAN frame
360 * (can_receive -> j1939_can_recv)
361 * and accessing j1939_priv
364 * (j1939_can_rx_unregister -> can_rx_unregister)
365 * and calling the final j1939_priv_put()
367 * is avoided by calling the final j1939_priv_put() from this
368 * RCU deferred cleanup call.
371 j1939_priv_put(jsk->priv);
375 /* call generic CAN sock destruct */
376 can_sock_destruct(sk);
379 static int j1939_sk_init(struct sock *sk)
381 struct j1939_sock *jsk = j1939_sk(sk);
383 /* Ensure that "sk" is first member in "struct j1939_sock", so that we
384 * can skip it during memset().
386 BUILD_BUG_ON(offsetof(struct j1939_sock, sk) != 0);
387 memset((void *)jsk + sizeof(jsk->sk), 0x0,
388 sizeof(*jsk) - sizeof(jsk->sk));
390 INIT_LIST_HEAD(&jsk->list);
391 init_waitqueue_head(&jsk->waitq);
392 jsk->sk.sk_priority = j1939_to_sk_priority(6);
393 jsk->sk.sk_reuse = 1; /* per default */
394 jsk->addr.sa = J1939_NO_ADDR;
395 jsk->addr.da = J1939_NO_ADDR;
396 jsk->addr.pgn = J1939_NO_PGN;
397 jsk->pgn_rx_filter = J1939_NO_PGN;
398 atomic_set(&jsk->skb_pending, 0);
399 spin_lock_init(&jsk->sk_session_queue_lock);
400 INIT_LIST_HEAD(&jsk->sk_session_queue);
402 /* j1939_sk_sock_destruct() depends on SOCK_RCU_FREE flag */
403 sock_set_flag(sk, SOCK_RCU_FREE);
404 sk->sk_destruct = j1939_sk_sock_destruct;
405 sk->sk_protocol = CAN_J1939;
410 static int j1939_sk_sanity_check(struct sockaddr_can *addr, int len)
413 return -EDESTADDRREQ;
414 if (len < J1939_MIN_NAMELEN)
416 if (addr->can_family != AF_CAN)
418 if (!addr->can_ifindex)
420 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) &&
421 !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn))
427 static int j1939_sk_bind(struct socket *sock, struct sockaddr *uaddr, int len)
429 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
430 struct j1939_sock *jsk = j1939_sk(sock->sk);
431 struct j1939_priv *priv;
436 ret = j1939_sk_sanity_check(addr, len);
446 /* Already bound to an interface? */
447 if (jsk->state & J1939_SOCK_BOUND) {
448 /* A re-bind() to a different interface is not
451 if (jsk->ifindex != addr->can_ifindex) {
453 goto out_release_sock;
456 /* drop old references */
457 j1939_jsk_del(priv, jsk);
458 j1939_local_ecu_put(priv, jsk->addr.src_name, jsk->addr.sa);
460 struct can_ml_priv *can_ml;
461 struct net_device *ndev;
463 ndev = dev_get_by_index(net, addr->can_ifindex);
466 goto out_release_sock;
469 can_ml = can_get_ml_priv(ndev);
473 goto out_release_sock;
476 if (!(ndev->flags & IFF_UP)) {
479 goto out_release_sock;
482 priv = j1939_netdev_start(ndev);
486 goto out_release_sock;
489 jsk->ifindex = addr->can_ifindex;
491 /* the corresponding j1939_priv_put() is called via
492 * sk->sk_destruct, which points to j1939_sk_sock_destruct()
494 j1939_priv_get(priv);
498 /* set default transmit pgn */
499 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
500 jsk->pgn_rx_filter = addr->can_addr.j1939.pgn;
501 jsk->addr.src_name = addr->can_addr.j1939.name;
502 jsk->addr.sa = addr->can_addr.j1939.addr;
504 /* get new references */
505 ret = j1939_local_ecu_get(priv, jsk->addr.src_name, jsk->addr.sa);
507 j1939_netdev_stop(priv);
508 goto out_release_sock;
511 j1939_jsk_add(priv, jsk);
513 out_release_sock: /* fall through */
514 release_sock(sock->sk);
519 static int j1939_sk_connect(struct socket *sock, struct sockaddr *uaddr,
522 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
523 struct j1939_sock *jsk = j1939_sk(sock->sk);
526 ret = j1939_sk_sanity_check(addr, len);
532 /* bind() before connect() is mandatory */
533 if (!(jsk->state & J1939_SOCK_BOUND)) {
535 goto out_release_sock;
538 /* A connect() to a different interface is not supported. */
539 if (jsk->ifindex != addr->can_ifindex) {
541 goto out_release_sock;
544 if (!addr->can_addr.j1939.name &&
545 addr->can_addr.j1939.addr == J1939_NO_ADDR &&
546 !sock_flag(&jsk->sk, SOCK_BROADCAST)) {
547 /* broadcast, but SO_BROADCAST not set */
549 goto out_release_sock;
552 jsk->addr.dst_name = addr->can_addr.j1939.name;
553 jsk->addr.da = addr->can_addr.j1939.addr;
555 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
556 jsk->addr.pgn = addr->can_addr.j1939.pgn;
558 jsk->state |= J1939_SOCK_CONNECTED;
560 out_release_sock: /* fall through */
561 release_sock(sock->sk);
566 static void j1939_sk_sock2sockaddr_can(struct sockaddr_can *addr,
567 const struct j1939_sock *jsk, int peer)
569 /* There are two holes (2 bytes and 3 bytes) to clear to avoid
570 * leaking kernel information to user space.
572 memset(addr, 0, J1939_MIN_NAMELEN);
574 addr->can_family = AF_CAN;
575 addr->can_ifindex = jsk->ifindex;
576 addr->can_addr.j1939.pgn = jsk->addr.pgn;
578 addr->can_addr.j1939.name = jsk->addr.dst_name;
579 addr->can_addr.j1939.addr = jsk->addr.da;
581 addr->can_addr.j1939.name = jsk->addr.src_name;
582 addr->can_addr.j1939.addr = jsk->addr.sa;
586 static int j1939_sk_getname(struct socket *sock, struct sockaddr *uaddr,
589 struct sockaddr_can *addr = (struct sockaddr_can *)uaddr;
590 struct sock *sk = sock->sk;
591 struct j1939_sock *jsk = j1939_sk(sk);
596 if (peer && !(jsk->state & J1939_SOCK_CONNECTED)) {
597 ret = -EADDRNOTAVAIL;
601 j1939_sk_sock2sockaddr_can(addr, jsk, peer);
602 ret = J1939_MIN_NAMELEN;
610 static int j1939_sk_release(struct socket *sock)
612 struct sock *sk = sock->sk;
613 struct j1939_sock *jsk;
621 if (jsk->state & J1939_SOCK_BOUND) {
622 struct j1939_priv *priv = jsk->priv;
624 if (wait_event_interruptible(jsk->waitq,
625 !j1939_sock_pending_get(&jsk->sk))) {
626 j1939_cancel_active_session(priv, sk);
627 j1939_sk_queue_drop_all(priv, jsk, ESHUTDOWN);
630 j1939_jsk_del(priv, jsk);
632 j1939_local_ecu_put(priv, jsk->addr.src_name,
635 j1939_netdev_stop(priv);
648 static int j1939_sk_setsockopt_flag(struct j1939_sock *jsk, char __user *optval,
649 unsigned int optlen, int flag)
653 if (optlen != sizeof(tmp))
655 if (copy_from_user(&tmp, optval, optlen))
662 release_sock(&jsk->sk);
666 static int j1939_sk_setsockopt(struct socket *sock, int level, int optname,
667 char __user *optval, unsigned int optlen)
669 struct sock *sk = sock->sk;
670 struct j1939_sock *jsk = j1939_sk(sk);
671 int tmp, count = 0, ret = 0;
672 struct j1939_filter *filters = NULL, *ofilters;
674 if (level != SOL_CAN_J1939)
678 case SO_J1939_FILTER:
680 struct j1939_filter *f;
683 if (optlen % sizeof(*filters) != 0)
686 if (optlen > J1939_FILTER_MAX *
687 sizeof(struct j1939_filter))
690 count = optlen / sizeof(*filters);
691 filters = memdup_user(optval, optlen);
693 return PTR_ERR(filters);
695 for (f = filters, c = count; c; f++, c--) {
696 f->name &= f->name_mask;
697 f->pgn &= f->pgn_mask;
698 f->addr &= f->addr_mask;
703 ofilters = jsk->filters;
704 jsk->filters = filters;
705 jsk->nfilters = count;
706 release_sock(&jsk->sk);
709 case SO_J1939_PROMISC:
710 return j1939_sk_setsockopt_flag(jsk, optval, optlen,
712 case SO_J1939_ERRQUEUE:
713 ret = j1939_sk_setsockopt_flag(jsk, optval, optlen,
714 J1939_SOCK_ERRQUEUE);
718 if (!(jsk->state & J1939_SOCK_ERRQUEUE))
719 skb_queue_purge(&sk->sk_error_queue);
721 case SO_J1939_SEND_PRIO:
722 if (optlen != sizeof(tmp))
724 if (copy_from_user(&tmp, optval, optlen))
726 if (tmp < 0 || tmp > 7)
728 if (tmp < 2 && !capable(CAP_NET_ADMIN))
731 jsk->sk.sk_priority = j1939_to_sk_priority(tmp);
732 release_sock(&jsk->sk);
739 static int j1939_sk_getsockopt(struct socket *sock, int level, int optname,
740 char __user *optval, int __user *optlen)
742 struct sock *sk = sock->sk;
743 struct j1939_sock *jsk = j1939_sk(sk);
745 /* set defaults for using 'int' properties */
747 int len = sizeof(tmp);
750 if (level != SOL_CAN_J1939)
752 if (get_user(ulen, optlen))
759 case SO_J1939_PROMISC:
760 tmp = (jsk->state & J1939_SOCK_PROMISC) ? 1 : 0;
762 case SO_J1939_ERRQUEUE:
763 tmp = (jsk->state & J1939_SOCK_ERRQUEUE) ? 1 : 0;
765 case SO_J1939_SEND_PRIO:
766 tmp = j1939_prio(jsk->sk.sk_priority);
773 /* copy to user, based on 'len' & 'val'
774 * but most sockopt's are 'int' properties, and have 'len' & 'val'
775 * left unchanged, but instead modified 'tmp'
779 else if (put_user(len, optlen))
781 else if (copy_to_user(optval, val, len))
786 release_sock(&jsk->sk);
790 static int j1939_sk_recvmsg(struct socket *sock, struct msghdr *msg,
791 size_t size, int flags)
793 struct sock *sk = sock->sk;
795 struct j1939_sk_buff_cb *skcb;
798 if (flags & ~(MSG_DONTWAIT | MSG_ERRQUEUE))
801 if (flags & MSG_ERRQUEUE)
802 return sock_recv_errqueue(sock->sk, msg, size, SOL_CAN_J1939,
805 skb = skb_recv_datagram(sk, flags, 0, &ret);
810 msg->msg_flags |= MSG_TRUNC;
814 ret = memcpy_to_msg(msg, skb->data, size);
816 skb_free_datagram(sk, skb);
820 skcb = j1939_skb_to_cb(skb);
821 if (j1939_address_is_valid(skcb->addr.da))
822 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_ADDR,
823 sizeof(skcb->addr.da), &skcb->addr.da);
825 if (skcb->addr.dst_name)
826 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_DEST_NAME,
827 sizeof(skcb->addr.dst_name), &skcb->addr.dst_name);
829 put_cmsg(msg, SOL_CAN_J1939, SCM_J1939_PRIO,
830 sizeof(skcb->priority), &skcb->priority);
833 struct sockaddr_can *paddr = msg->msg_name;
835 msg->msg_namelen = J1939_MIN_NAMELEN;
836 memset(msg->msg_name, 0, msg->msg_namelen);
837 paddr->can_family = AF_CAN;
838 paddr->can_ifindex = skb->skb_iif;
839 paddr->can_addr.j1939.name = skcb->addr.src_name;
840 paddr->can_addr.j1939.addr = skcb->addr.sa;
841 paddr->can_addr.j1939.pgn = skcb->addr.pgn;
844 sock_recv_ts_and_drops(msg, sk, skb);
845 msg->msg_flags |= skcb->msg_flags;
846 skb_free_datagram(sk, skb);
851 static struct sk_buff *j1939_sk_alloc_skb(struct net_device *ndev,
853 struct msghdr *msg, size_t size,
856 struct j1939_sock *jsk = j1939_sk(sk);
857 struct j1939_sk_buff_cb *skcb;
861 skb = sock_alloc_send_skb(sk,
863 sizeof(struct can_frame) -
864 sizeof(((struct can_frame *)NULL)->data) +
865 sizeof(struct can_skb_priv),
866 msg->msg_flags & MSG_DONTWAIT, &ret);
870 can_skb_reserve(skb);
871 can_skb_prv(skb)->ifindex = ndev->ifindex;
872 can_skb_prv(skb)->skbcnt = 0;
873 skb_reserve(skb, offsetof(struct can_frame, data));
875 ret = memcpy_from_msg(skb_put(skb, size), msg, size);
881 skcb = j1939_skb_to_cb(skb);
882 memset(skcb, 0, sizeof(*skcb));
883 skcb->addr = jsk->addr;
884 skcb->priority = j1939_prio(sk->sk_priority);
887 struct sockaddr_can *addr = msg->msg_name;
889 if (addr->can_addr.j1939.name ||
890 addr->can_addr.j1939.addr != J1939_NO_ADDR) {
891 skcb->addr.dst_name = addr->can_addr.j1939.name;
892 skcb->addr.da = addr->can_addr.j1939.addr;
894 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn))
895 skcb->addr.pgn = addr->can_addr.j1939.pgn;
908 static size_t j1939_sk_opt_stats_get_size(void)
911 nla_total_size(sizeof(u32)) + /* J1939_NLA_BYTES_ACKED */
915 static struct sk_buff *
916 j1939_sk_get_timestamping_opt_stats(struct j1939_session *session)
918 struct sk_buff *stats;
921 stats = alloc_skb(j1939_sk_opt_stats_get_size(), GFP_ATOMIC);
925 if (session->skcb.addr.type == J1939_SIMPLE)
926 size = session->total_message_size;
928 size = min(session->pkt.tx_acked * 7,
929 session->total_message_size);
931 nla_put_u32(stats, J1939_NLA_BYTES_ACKED, size);
936 void j1939_sk_errqueue(struct j1939_session *session,
937 enum j1939_sk_errqueue_type type)
939 struct j1939_priv *priv = session->priv;
940 struct sock *sk = session->sk;
941 struct j1939_sock *jsk;
942 struct sock_exterr_skb *serr;
947 /* currently we have no sk for the RX session */
953 if (!(jsk->state & J1939_SOCK_ERRQUEUE))
956 skb = j1939_sk_get_timestamping_opt_stats(session);
960 skb->tstamp = ktime_get_real();
962 BUILD_BUG_ON(sizeof(struct sock_exterr_skb) > sizeof(skb->cb));
964 serr = SKB_EXT_ERR(skb);
965 memset(serr, 0, sizeof(*serr));
967 case J1939_ERRQUEUE_ACK:
968 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_ACK)) {
973 serr->ee.ee_errno = ENOMSG;
974 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
975 serr->ee.ee_info = SCM_TSTAMP_ACK;
978 case J1939_ERRQUEUE_SCHED:
979 if (!(sk->sk_tsflags & SOF_TIMESTAMPING_TX_SCHED)) {
984 serr->ee.ee_errno = ENOMSG;
985 serr->ee.ee_origin = SO_EE_ORIGIN_TIMESTAMPING;
986 serr->ee.ee_info = SCM_TSTAMP_SCHED;
989 case J1939_ERRQUEUE_ABORT:
990 serr->ee.ee_errno = session->err;
991 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
992 serr->ee.ee_info = J1939_EE_INFO_TX_ABORT;
996 netdev_err(priv->ndev, "Unknown errqueue type %i\n", type);
999 serr->opt_stats = true;
1000 if (sk->sk_tsflags & SOF_TIMESTAMPING_OPT_ID)
1001 serr->ee.ee_data = session->tskey;
1003 netdev_dbg(session->priv->ndev, "%s: 0x%p tskey: %i, state: %s\n",
1004 __func__, session, session->tskey, state);
1005 err = sock_queue_err_skb(sk, skb);
1011 void j1939_sk_send_loop_abort(struct sock *sk, int err)
1015 sk->sk_error_report(sk);
1018 static int j1939_sk_send_loop(struct j1939_priv *priv, struct sock *sk,
1019 struct msghdr *msg, size_t size)
1022 struct j1939_sock *jsk = j1939_sk(sk);
1023 struct j1939_session *session = j1939_sk_get_incomplete_session(jsk);
1024 struct sk_buff *skb;
1025 size_t segment_size, todo_size;
1029 session->total_message_size != session->total_queued_size + size) {
1030 j1939_session_put(session);
1037 struct j1939_sk_buff_cb *skcb;
1039 segment_size = min_t(size_t, J1939_MAX_TP_PACKET_SIZE,
1042 /* Allocate skb for one segment */
1043 skb = j1939_sk_alloc_skb(priv->ndev, sk, msg, segment_size,
1048 skcb = j1939_skb_to_cb(skb);
1051 /* at this point the size should be full size
1055 session = j1939_tp_send(priv, skb, size);
1056 if (IS_ERR(session)) {
1057 ret = PTR_ERR(session);
1060 if (j1939_sk_queue_session(session)) {
1061 /* try to activate session if we a
1064 if (!j1939_session_activate(session)) {
1065 j1939_tp_schedule_txtimer(session, 0);
1069 j1939_sk_queue_drop_all(priv, jsk,
1075 skcb->offset = session->total_queued_size;
1076 j1939_session_skb_queue(session, skb);
1079 todo_size -= segment_size;
1080 session->total_queued_size += segment_size;
1086 netdev_warn(priv->ndev,
1087 "no error found and not completely queued?! %zu\n",
1094 case -EAGAIN: /* OK */
1095 if (todo_size != size)
1096 ret = size - todo_size;
1098 default: /* ERROR */
1103 j1939_session_put(session);
1112 static int j1939_sk_sendmsg(struct socket *sock, struct msghdr *msg,
1115 struct sock *sk = sock->sk;
1116 struct j1939_sock *jsk = j1939_sk(sk);
1117 struct j1939_priv *priv;
1121 lock_sock(sock->sk);
1122 /* various socket state tests */
1123 if (!(jsk->state & J1939_SOCK_BOUND)) {
1129 ifindex = jsk->ifindex;
1131 if (!jsk->addr.src_name && jsk->addr.sa == J1939_NO_ADDR) {
1132 /* no source address assigned yet */
1137 /* deal with provided destination address info */
1138 if (msg->msg_name) {
1139 struct sockaddr_can *addr = msg->msg_name;
1141 if (msg->msg_namelen < J1939_MIN_NAMELEN) {
1146 if (addr->can_family != AF_CAN) {
1151 if (addr->can_ifindex && addr->can_ifindex != ifindex) {
1156 if (j1939_pgn_is_valid(addr->can_addr.j1939.pgn) &&
1157 !j1939_pgn_is_clean_pdu(addr->can_addr.j1939.pgn)) {
1162 if (!addr->can_addr.j1939.name &&
1163 addr->can_addr.j1939.addr == J1939_NO_ADDR &&
1164 !sock_flag(sk, SOCK_BROADCAST)) {
1165 /* broadcast, but SO_BROADCAST not set */
1170 if (!jsk->addr.dst_name && jsk->addr.da == J1939_NO_ADDR &&
1171 !sock_flag(sk, SOCK_BROADCAST)) {
1172 /* broadcast, but SO_BROADCAST not set */
1178 ret = j1939_sk_send_loop(priv, sk, msg, size);
1181 release_sock(sock->sk);
1186 void j1939_sk_netdev_event_netdown(struct j1939_priv *priv)
1188 struct j1939_sock *jsk;
1189 int error_code = ENETDOWN;
1191 spin_lock_bh(&priv->j1939_socks_lock);
1192 list_for_each_entry(jsk, &priv->j1939_socks, list) {
1193 jsk->sk.sk_err = error_code;
1194 if (!sock_flag(&jsk->sk, SOCK_DEAD))
1195 jsk->sk.sk_error_report(&jsk->sk);
1197 j1939_sk_queue_drop_all(priv, jsk, error_code);
1199 spin_unlock_bh(&priv->j1939_socks_lock);
1202 static int j1939_sk_no_ioctlcmd(struct socket *sock, unsigned int cmd,
1205 /* no ioctls for socket layer -> hand it down to NIC layer */
1206 return -ENOIOCTLCMD;
1209 static const struct proto_ops j1939_ops = {
1211 .release = j1939_sk_release,
1212 .bind = j1939_sk_bind,
1213 .connect = j1939_sk_connect,
1214 .socketpair = sock_no_socketpair,
1215 .accept = sock_no_accept,
1216 .getname = j1939_sk_getname,
1217 .poll = datagram_poll,
1218 .ioctl = j1939_sk_no_ioctlcmd,
1219 .listen = sock_no_listen,
1220 .shutdown = sock_no_shutdown,
1221 .setsockopt = j1939_sk_setsockopt,
1222 .getsockopt = j1939_sk_getsockopt,
1223 .sendmsg = j1939_sk_sendmsg,
1224 .recvmsg = j1939_sk_recvmsg,
1225 .mmap = sock_no_mmap,
1226 .sendpage = sock_no_sendpage,
1229 static struct proto j1939_proto __read_mostly = {
1230 .name = "CAN_J1939",
1231 .owner = THIS_MODULE,
1232 .obj_size = sizeof(struct j1939_sock),
1233 .init = j1939_sk_init,
1236 const struct can_proto j1939_can_proto = {
1238 .protocol = CAN_J1939,
1240 .prot = &j1939_proto,