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-rw-r--r--net/iucv/af_iucv.c297
1 files changed, 179 insertions, 118 deletions
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index 656cbd195825..6be5f92d1094 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -54,6 +54,38 @@ static const u8 iprm_shutdown[8] =
54#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */ 54#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
55#define CB_TRGCLS_LEN (TRGCLS_SIZE) 55#define CB_TRGCLS_LEN (TRGCLS_SIZE)
56 56
57#define __iucv_sock_wait(sk, condition, timeo, ret) \
58do { \
59 DEFINE_WAIT(__wait); \
60 long __timeo = timeo; \
61 ret = 0; \
62 while (!(condition)) { \
63 prepare_to_wait(sk->sk_sleep, &__wait, TASK_INTERRUPTIBLE); \
64 if (!__timeo) { \
65 ret = -EAGAIN; \
66 break; \
67 } \
68 if (signal_pending(current)) { \
69 ret = sock_intr_errno(__timeo); \
70 break; \
71 } \
72 release_sock(sk); \
73 __timeo = schedule_timeout(__timeo); \
74 lock_sock(sk); \
75 ret = sock_error(sk); \
76 if (ret) \
77 break; \
78 } \
79 finish_wait(sk->sk_sleep, &__wait); \
80} while (0)
81
82#define iucv_sock_wait(sk, condition, timeo) \
83({ \
84 int __ret = 0; \
85 if (!(condition)) \
86 __iucv_sock_wait(sk, condition, timeo, __ret); \
87 __ret; \
88})
57 89
58static void iucv_sock_kill(struct sock *sk); 90static void iucv_sock_kill(struct sock *sk);
59static void iucv_sock_close(struct sock *sk); 91static void iucv_sock_close(struct sock *sk);
@@ -238,6 +270,48 @@ static inline size_t iucv_msg_length(struct iucv_message *msg)
238 return msg->length; 270 return msg->length;
239} 271}
240 272
273/**
274 * iucv_sock_in_state() - check for specific states
275 * @sk: sock structure
276 * @state: first iucv sk state
277 * @state: second iucv sk state
278 *
279 * Returns true if the socket in either in the first or second state.
280 */
281static int iucv_sock_in_state(struct sock *sk, int state, int state2)
282{
283 return (sk->sk_state == state || sk->sk_state == state2);
284}
285
286/**
287 * iucv_below_msglim() - function to check if messages can be sent
288 * @sk: sock structure
289 *
290 * Returns true if the send queue length is lower than the message limit.
291 * Always returns true if the socket is not connected (no iucv path for
292 * checking the message limit).
293 */
294static inline int iucv_below_msglim(struct sock *sk)
295{
296 struct iucv_sock *iucv = iucv_sk(sk);
297
298 if (sk->sk_state != IUCV_CONNECTED)
299 return 1;
300 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
301}
302
303/**
304 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
305 */
306static void iucv_sock_wake_msglim(struct sock *sk)
307{
308 read_lock(&sk->sk_callback_lock);
309 if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
310 wake_up_interruptible_all(sk->sk_sleep);
311 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
312 read_unlock(&sk->sk_callback_lock);
313}
314
241/* Timers */ 315/* Timers */
242static void iucv_sock_timeout(unsigned long arg) 316static void iucv_sock_timeout(unsigned long arg)
243{ 317{
@@ -329,7 +403,9 @@ static void iucv_sock_close(struct sock *sk)
329 timeo = sk->sk_lingertime; 403 timeo = sk->sk_lingertime;
330 else 404 else
331 timeo = IUCV_DISCONN_TIMEOUT; 405 timeo = IUCV_DISCONN_TIMEOUT;
332 err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo); 406 err = iucv_sock_wait(sk,
407 iucv_sock_in_state(sk, IUCV_CLOSED, 0),
408 timeo);
333 } 409 }
334 410
335 case IUCV_CLOSING: /* fall through */ 411 case IUCV_CLOSING: /* fall through */
@@ -510,39 +586,6 @@ struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
510 return NULL; 586 return NULL;
511} 587}
512 588
513int iucv_sock_wait_state(struct sock *sk, int state, int state2,
514 unsigned long timeo)
515{
516 DECLARE_WAITQUEUE(wait, current);
517 int err = 0;
518
519 add_wait_queue(sk->sk_sleep, &wait);
520 while (sk->sk_state != state && sk->sk_state != state2) {
521 set_current_state(TASK_INTERRUPTIBLE);
522
523 if (!timeo) {
524 err = -EAGAIN;
525 break;
526 }
527
528 if (signal_pending(current)) {
529 err = sock_intr_errno(timeo);
530 break;
531 }
532
533 release_sock(sk);
534 timeo = schedule_timeout(timeo);
535 lock_sock(sk);
536
537 err = sock_error(sk);
538 if (err)
539 break;
540 }
541 set_current_state(TASK_RUNNING);
542 remove_wait_queue(sk->sk_sleep, &wait);
543 return err;
544}
545
546/* Bind an unbound socket */ 589/* Bind an unbound socket */
547static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 590static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
548 int addr_len) 591 int addr_len)
@@ -687,8 +730,9 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
687 } 730 }
688 731
689 if (sk->sk_state != IUCV_CONNECTED) { 732 if (sk->sk_state != IUCV_CONNECTED) {
690 err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN, 733 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
691 sock_sndtimeo(sk, flags & O_NONBLOCK)); 734 IUCV_DISCONN),
735 sock_sndtimeo(sk, flags & O_NONBLOCK));
692 } 736 }
693 737
694 if (sk->sk_state == IUCV_DISCONN) { 738 if (sk->sk_state == IUCV_DISCONN) {
@@ -842,9 +886,11 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
842 struct iucv_message txmsg; 886 struct iucv_message txmsg;
843 struct cmsghdr *cmsg; 887 struct cmsghdr *cmsg;
844 int cmsg_done; 888 int cmsg_done;
889 long timeo;
845 char user_id[9]; 890 char user_id[9];
846 char appl_id[9]; 891 char appl_id[9];
847 int err; 892 int err;
893 int noblock = msg->msg_flags & MSG_DONTWAIT;
848 894
849 err = sock_error(sk); 895 err = sock_error(sk);
850 if (err) 896 if (err)
@@ -864,108 +910,119 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
864 goto out; 910 goto out;
865 } 911 }
866 912
867 if (sk->sk_state == IUCV_CONNECTED) { 913 /* Return if the socket is not in connected state */
868 /* initialize defaults */ 914 if (sk->sk_state != IUCV_CONNECTED) {
869 cmsg_done = 0; /* check for duplicate headers */ 915 err = -ENOTCONN;
870 txmsg.class = 0; 916 goto out;
917 }
871 918
872 /* iterate over control messages */ 919 /* initialize defaults */
873 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; 920 cmsg_done = 0; /* check for duplicate headers */
874 cmsg = CMSG_NXTHDR(msg, cmsg)) { 921 txmsg.class = 0;
875 922
876 if (!CMSG_OK(msg, cmsg)) { 923 /* iterate over control messages */
877 err = -EINVAL; 924 for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
878 goto out; 925 cmsg = CMSG_NXTHDR(msg, cmsg)) {
879 } 926
927 if (!CMSG_OK(msg, cmsg)) {
928 err = -EINVAL;
929 goto out;
930 }
931
932 if (cmsg->cmsg_level != SOL_IUCV)
933 continue;
880 934
881 if (cmsg->cmsg_level != SOL_IUCV) 935 if (cmsg->cmsg_type & cmsg_done) {
882 continue; 936 err = -EINVAL;
937 goto out;
938 }
939 cmsg_done |= cmsg->cmsg_type;
883 940
884 if (cmsg->cmsg_type & cmsg_done) { 941 switch (cmsg->cmsg_type) {
942 case SCM_IUCV_TRGCLS:
943 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
885 err = -EINVAL; 944 err = -EINVAL;
886 goto out; 945 goto out;
887 } 946 }
888 cmsg_done |= cmsg->cmsg_type;
889
890 switch (cmsg->cmsg_type) {
891 case SCM_IUCV_TRGCLS:
892 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
893 err = -EINVAL;
894 goto out;
895 }
896 947
897 /* set iucv message target class */ 948 /* set iucv message target class */
898 memcpy(&txmsg.class, 949 memcpy(&txmsg.class,
899 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 950 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
900 951
901 break; 952 break;
902 953
903 default: 954 default:
904 err = -EINVAL; 955 err = -EINVAL;
905 goto out; 956 goto out;
906 break; 957 break;
907 }
908 } 958 }
959 }
909 960
910 /* allocate one skb for each iucv message: 961 /* allocate one skb for each iucv message:
911 * this is fine for SOCK_SEQPACKET (unless we want to support 962 * this is fine for SOCK_SEQPACKET (unless we want to support
912 * segmented records using the MSG_EOR flag), but 963 * segmented records using the MSG_EOR flag), but
913 * for SOCK_STREAM we might want to improve it in future */ 964 * for SOCK_STREAM we might want to improve it in future */
914 if (!(skb = sock_alloc_send_skb(sk, len, 965 skb = sock_alloc_send_skb(sk, len, noblock, &err);
915 msg->msg_flags & MSG_DONTWAIT, 966 if (!skb)
916 &err))) 967 goto out;
917 goto out; 968 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
969 err = -EFAULT;
970 goto fail;
971 }
918 972
919 if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) { 973 /* wait if outstanding messages for iucv path has reached */
920 err = -EFAULT; 974 timeo = sock_sndtimeo(sk, noblock);
921 goto fail; 975 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
922 } 976 if (err)
977 goto fail;
923 978
924 /* increment and save iucv message tag for msg_completion cbk */ 979 /* return -ECONNRESET if the socket is no longer connected */
925 txmsg.tag = iucv->send_tag++; 980 if (sk->sk_state != IUCV_CONNECTED) {
926 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN); 981 err = -ECONNRESET;
927 skb_queue_tail(&iucv->send_skb_q, skb); 982 goto fail;
983 }
928 984
929 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) 985 /* increment and save iucv message tag for msg_completion cbk */
930 && skb->len <= 7) { 986 txmsg.tag = iucv->send_tag++;
931 err = iucv_send_iprm(iucv->path, &txmsg, skb); 987 memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
988 skb_queue_tail(&iucv->send_skb_q, skb);
932 989
933 /* on success: there is no message_complete callback 990 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
934 * for an IPRMDATA msg; remove skb from send queue */ 991 && skb->len <= 7) {
935 if (err == 0) { 992 err = iucv_send_iprm(iucv->path, &txmsg, skb);
936 skb_unlink(skb, &iucv->send_skb_q);
937 kfree_skb(skb);
938 }
939 993
940 /* this error should never happen since the 994 /* on success: there is no message_complete callback
941 * IUCV_IPRMDATA path flag is set... sever path */ 995 * for an IPRMDATA msg; remove skb from send queue */
942 if (err == 0x15) { 996 if (err == 0) {
943 iucv_path_sever(iucv->path, NULL); 997 skb_unlink(skb, &iucv->send_skb_q);
944 skb_unlink(skb, &iucv->send_skb_q); 998 kfree_skb(skb);
945 err = -EPIPE; 999 }
946 goto fail; 1000
947 } 1001 /* this error should never happen since the
948 } else 1002 * IUCV_IPRMDATA path flag is set... sever path */
949 err = iucv_message_send(iucv->path, &txmsg, 0, 0, 1003 if (err == 0x15) {
950 (void *) skb->data, skb->len); 1004 iucv_path_sever(iucv->path, NULL);
951 if (err) {
952 if (err == 3) {
953 user_id[8] = 0;
954 memcpy(user_id, iucv->dst_user_id, 8);
955 appl_id[8] = 0;
956 memcpy(appl_id, iucv->dst_name, 8);
957 pr_err("Application %s on z/VM guest %s"
958 " exceeds message limit\n",
959 user_id, appl_id);
960 }
961 skb_unlink(skb, &iucv->send_skb_q); 1005 skb_unlink(skb, &iucv->send_skb_q);
962 err = -EPIPE; 1006 err = -EPIPE;
963 goto fail; 1007 goto fail;
964 } 1008 }
965 1009 } else
966 } else { 1010 err = iucv_message_send(iucv->path, &txmsg, 0, 0,
967 err = -ENOTCONN; 1011 (void *) skb->data, skb->len);
968 goto out; 1012 if (err) {
1013 if (err == 3) {
1014 user_id[8] = 0;
1015 memcpy(user_id, iucv->dst_user_id, 8);
1016 appl_id[8] = 0;
1017 memcpy(appl_id, iucv->dst_name, 8);
1018 pr_err("Application %s on z/VM guest %s"
1019 " exceeds message limit\n",
1020 appl_id, user_id);
1021 err = -EAGAIN;
1022 } else
1023 err = -EPIPE;
1024 skb_unlink(skb, &iucv->send_skb_q);
1025 goto fail;
969 } 1026 }
970 1027
971 release_sock(sk); 1028 release_sock(sk);
@@ -1581,7 +1638,11 @@ static void iucv_callback_txdone(struct iucv_path *path,
1581 1638
1582 spin_unlock_irqrestore(&list->lock, flags); 1639 spin_unlock_irqrestore(&list->lock, flags);
1583 1640
1584 kfree_skb(this); 1641 if (this) {
1642 kfree_skb(this);
1643 /* wake up any process waiting for sending */
1644 iucv_sock_wake_msglim(sk);
1645 }
1585 } 1646 }
1586 BUG_ON(!this); 1647 BUG_ON(!this);
1587 1648
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-13 19:19:43 -0500