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-rw-r--r--net/ieee802154/af_ieee802154.c12
-rw-r--r--net/ipv4/route.c14
-rw-r--r--net/iucv/af_iucv.c297
3 files changed, 194 insertions, 129 deletions
diff --git a/net/ieee802154/af_ieee802154.c b/net/ieee802154/af_ieee802154.c
index 882a927cefae..3bb6bdb1dac1 100644
--- a/net/ieee802154/af_ieee802154.c
+++ b/net/ieee802154/af_ieee802154.c
@@ -39,14 +39,6 @@
#include "af802154.h"
-#define DBG_DUMP(data, len) { \
- int i; \
- pr_debug("function: %s: data: len %d:\n", __func__, len); \
- for (i = 0; i < len; i++) {\
- pr_debug("%02x: %02x\n", i, (data)[i]); \
- } \
-}
-
/*
* Utility function for families
*/
@@ -302,10 +294,12 @@ static struct net_proto_family ieee802154_family_ops = {
static int ieee802154_rcv(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
- DBG_DUMP(skb->data, skb->len);
if (!netif_running(dev))
return -ENODEV;
pr_debug("got frame, type %d, dev %p\n", dev->type, dev);
+#ifdef DEBUG
+ print_hex_dump_bytes("ieee802154_rcv ", DUMP_PREFIX_NONE, skb->data, skb->len);
+#endif
if (!net_eq(dev_net(dev), &init_net))
goto drop;
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index cd76b3cb7092..65b3a8b11a6c 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1085,8 +1085,16 @@ restart:
now = jiffies;
if (!rt_caching(dev_net(rt->u.dst.dev))) {
- rt_drop(rt);
- return 0;
+ /*
+ * If we're not caching, just tell the caller we
+ * were successful and don't touch the route. The
+ * caller hold the sole reference to the cache entry, and
+ * it will be released when the caller is done with it.
+ * If we drop it here, the callers have no way to resolve routes
+ * when we're not caching. Instead, just point *rp at rt, so
+ * the caller gets a single use out of the route
+ */
+ goto report_and_exit;
}
rthp = &rt_hash_table[hash].chain;
@@ -1217,6 +1225,8 @@ restart:
rcu_assign_pointer(rt_hash_table[hash].chain, rt);
spin_unlock_bh(rt_hash_lock_addr(hash));
+
+report_and_exit:
if (rp)
*rp = rt;
else
diff --git a/net/iucv/af_iucv.c b/net/iucv/af_iucv.c
index a9b3a6f9ea95..abadb4a846cf 100644
--- a/net/iucv/af_iucv.c
+++ b/net/iucv/af_iucv.c
@@ -53,6 +53,38 @@ static const u8 iprm_shutdown[8] =
#define CB_TRGCLS(skb) ((skb)->cb + CB_TAG_LEN) /* iucv msg target class */
#define CB_TRGCLS_LEN (TRGCLS_SIZE)
+#define __iucv_sock_wait(sk, condition, timeo, ret) \
+do { \
+ DEFINE_WAIT(__wait); \
+ long __timeo = timeo; \
+ ret = 0; \
+ while (!(condition)) { \
+ prepare_to_wait(sk->sk_sleep, &__wait, TASK_INTERRUPTIBLE); \
+ if (!__timeo) { \
+ ret = -EAGAIN; \
+ break; \
+ } \
+ if (signal_pending(current)) { \
+ ret = sock_intr_errno(__timeo); \
+ break; \
+ } \
+ release_sock(sk); \
+ __timeo = schedule_timeout(__timeo); \
+ lock_sock(sk); \
+ ret = sock_error(sk); \
+ if (ret) \
+ break; \
+ } \
+ finish_wait(sk->sk_sleep, &__wait); \
+} while (0)
+
+#define iucv_sock_wait(sk, condition, timeo) \
+({ \
+ int __ret = 0; \
+ if (!(condition)) \
+ __iucv_sock_wait(sk, condition, timeo, __ret); \
+ __ret; \
+})
static void iucv_sock_kill(struct sock *sk);
static void iucv_sock_close(struct sock *sk);
@@ -121,6 +153,48 @@ static inline size_t iucv_msg_length(struct iucv_message *msg)
return msg->length;
}
+/**
+ * iucv_sock_in_state() - check for specific states
+ * @sk: sock structure
+ * @state: first iucv sk state
+ * @state: second iucv sk state
+ *
+ * Returns true if the socket in either in the first or second state.
+ */
+static int iucv_sock_in_state(struct sock *sk, int state, int state2)
+{
+ return (sk->sk_state == state || sk->sk_state == state2);
+}
+
+/**
+ * iucv_below_msglim() - function to check if messages can be sent
+ * @sk: sock structure
+ *
+ * Returns true if the send queue length is lower than the message limit.
+ * Always returns true if the socket is not connected (no iucv path for
+ * checking the message limit).
+ */
+static inline int iucv_below_msglim(struct sock *sk)
+{
+ struct iucv_sock *iucv = iucv_sk(sk);
+
+ if (sk->sk_state != IUCV_CONNECTED)
+ return 1;
+ return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim);
+}
+
+/**
+ * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit
+ */
+static void iucv_sock_wake_msglim(struct sock *sk)
+{
+ read_lock(&sk->sk_callback_lock);
+ if (sk->sk_sleep && waitqueue_active(sk->sk_sleep))
+ wake_up_interruptible_all(sk->sk_sleep);
+ sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT);
+ read_unlock(&sk->sk_callback_lock);
+}
+
/* Timers */
static void iucv_sock_timeout(unsigned long arg)
{
@@ -212,7 +286,9 @@ static void iucv_sock_close(struct sock *sk)
timeo = sk->sk_lingertime;
else
timeo = IUCV_DISCONN_TIMEOUT;
- err = iucv_sock_wait_state(sk, IUCV_CLOSED, 0, timeo);
+ err = iucv_sock_wait(sk,
+ iucv_sock_in_state(sk, IUCV_CLOSED, 0),
+ timeo);
}
case IUCV_CLOSING: /* fall through */
@@ -393,39 +469,6 @@ struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock)
return NULL;
}
-int iucv_sock_wait_state(struct sock *sk, int state, int state2,
- unsigned long timeo)
-{
- DECLARE_WAITQUEUE(wait, current);
- int err = 0;
-
- add_wait_queue(sk->sk_sleep, &wait);
- while (sk->sk_state != state && sk->sk_state != state2) {
- set_current_state(TASK_INTERRUPTIBLE);
-
- if (!timeo) {
- err = -EAGAIN;
- break;
- }
-
- if (signal_pending(current)) {
- err = sock_intr_errno(timeo);
- break;
- }
-
- release_sock(sk);
- timeo = schedule_timeout(timeo);
- lock_sock(sk);
-
- err = sock_error(sk);
- if (err)
- break;
- }
- set_current_state(TASK_RUNNING);
- remove_wait_queue(sk->sk_sleep, &wait);
- return err;
-}
-
/* Bind an unbound socket */
static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr,
int addr_len)
@@ -570,8 +613,9 @@ static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr,
}
if (sk->sk_state != IUCV_CONNECTED) {
- err = iucv_sock_wait_state(sk, IUCV_CONNECTED, IUCV_DISCONN,
- sock_sndtimeo(sk, flags & O_NONBLOCK));
+ err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED,
+ IUCV_DISCONN),
+ sock_sndtimeo(sk, flags & O_NONBLOCK));
}
if (sk->sk_state == IUCV_DISCONN) {
@@ -725,9 +769,11 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
struct iucv_message txmsg;
struct cmsghdr *cmsg;
int cmsg_done;
+ long timeo;
char user_id[9];
char appl_id[9];
int err;
+ int noblock = msg->msg_flags & MSG_DONTWAIT;
err = sock_error(sk);
if (err)
@@ -747,108 +793,119 @@ static int iucv_sock_sendmsg(struct kiocb *iocb, struct socket *sock,
goto out;
}
- if (sk->sk_state == IUCV_CONNECTED) {
- /* initialize defaults */
- cmsg_done = 0; /* check for duplicate headers */
- txmsg.class = 0;
+ /* Return if the socket is not in connected state */
+ if (sk->sk_state != IUCV_CONNECTED) {
+ err = -ENOTCONN;
+ goto out;
+ }
- /* iterate over control messages */
- for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
- cmsg = CMSG_NXTHDR(msg, cmsg)) {
+ /* initialize defaults */
+ cmsg_done = 0; /* check for duplicate headers */
+ txmsg.class = 0;
- if (!CMSG_OK(msg, cmsg)) {
- err = -EINVAL;
- goto out;
- }
+ /* iterate over control messages */
+ for (cmsg = CMSG_FIRSTHDR(msg); cmsg;
+ cmsg = CMSG_NXTHDR(msg, cmsg)) {
+
+ if (!CMSG_OK(msg, cmsg)) {
+ err = -EINVAL;
+ goto out;
+ }
+
+ if (cmsg->cmsg_level != SOL_IUCV)
+ continue;
- if (cmsg->cmsg_level != SOL_IUCV)
- continue;
+ if (cmsg->cmsg_type & cmsg_done) {
+ err = -EINVAL;
+ goto out;
+ }
+ cmsg_done |= cmsg->cmsg_type;
- if (cmsg->cmsg_type & cmsg_done) {
+ switch (cmsg->cmsg_type) {
+ case SCM_IUCV_TRGCLS:
+ if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
err = -EINVAL;
goto out;
}
- cmsg_done |= cmsg->cmsg_type;
-
- switch (cmsg->cmsg_type) {
- case SCM_IUCV_TRGCLS:
- if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) {
- err = -EINVAL;
- goto out;
- }
- /* set iucv message target class */
- memcpy(&txmsg.class,
- (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
+ /* set iucv message target class */
+ memcpy(&txmsg.class,
+ (void *) CMSG_DATA(cmsg), TRGCLS_SIZE);
- break;
+ break;
- default:
- err = -EINVAL;
- goto out;
- break;
- }
+ default:
+ err = -EINVAL;
+ goto out;
+ break;
}
+ }
- /* allocate one skb for each iucv message:
- * this is fine for SOCK_SEQPACKET (unless we want to support
- * segmented records using the MSG_EOR flag), but
- * for SOCK_STREAM we might want to improve it in future */
- if (!(skb = sock_alloc_send_skb(sk, len,
- msg->msg_flags & MSG_DONTWAIT,
- &err)))
- goto out;
+ /* allocate one skb for each iucv message:
+ * this is fine for SOCK_SEQPACKET (unless we want to support
+ * segmented records using the MSG_EOR flag), but
+ * for SOCK_STREAM we might want to improve it in future */
+ skb = sock_alloc_send_skb(sk, len, noblock, &err);
+ if (!skb)
+ goto out;
+ if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
+ err = -EFAULT;
+ goto fail;
+ }
- if (memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len)) {
- err = -EFAULT;
- goto fail;
- }
+ /* wait if outstanding messages for iucv path has reached */
+ timeo = sock_sndtimeo(sk, noblock);
+ err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo);
+ if (err)
+ goto fail;
- /* increment and save iucv message tag for msg_completion cbk */
- txmsg.tag = iucv->send_tag++;
- memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
- skb_queue_tail(&iucv->send_skb_q, skb);
+ /* return -ECONNRESET if the socket is no longer connected */
+ if (sk->sk_state != IUCV_CONNECTED) {
+ err = -ECONNRESET;
+ goto fail;
+ }
- if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
- && skb->len <= 7) {
- err = iucv_send_iprm(iucv->path, &txmsg, skb);
+ /* increment and save iucv message tag for msg_completion cbk */
+ txmsg.tag = iucv->send_tag++;
+ memcpy(CB_TAG(skb), &txmsg.tag, CB_TAG_LEN);
+ skb_queue_tail(&iucv->send_skb_q, skb);
- /* on success: there is no message_complete callback
- * for an IPRMDATA msg; remove skb from send queue */
- if (err == 0) {
- skb_unlink(skb, &iucv->send_skb_q);
- kfree_skb(skb);
- }
+ if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags)
+ && skb->len <= 7) {
+ err = iucv_send_iprm(iucv->path, &txmsg, skb);
- /* this error should never happen since the
- * IUCV_IPRMDATA path flag is set... sever path */
- if (err == 0x15) {
- iucv_path_sever(iucv->path, NULL);
- skb_unlink(skb, &iucv->send_skb_q);
- err = -EPIPE;
- goto fail;
- }
- } else
- err = iucv_message_send(iucv->path, &txmsg, 0, 0,
- (void *) skb->data, skb->len);
- if (err) {
- if (err == 3) {
- user_id[8] = 0;
- memcpy(user_id, iucv->dst_user_id, 8);
- appl_id[8] = 0;
- memcpy(appl_id, iucv->dst_name, 8);
- pr_err("Application %s on z/VM guest %s"
- " exceeds message limit\n",
- user_id, appl_id);
- }
+ /* on success: there is no message_complete callback
+ * for an IPRMDATA msg; remove skb from send queue */
+ if (err == 0) {
+ skb_unlink(skb, &iucv->send_skb_q);
+ kfree_skb(skb);
+ }
+
+ /* this error should never happen since the
+ * IUCV_IPRMDATA path flag is set... sever path */
+ if (err == 0x15) {
+ iucv_path_sever(iucv->path, NULL);
skb_unlink(skb, &iucv->send_skb_q);
err = -EPIPE;
goto fail;
}
-
- } else {
- err = -ENOTCONN;
- goto out;
+ } else
+ err = iucv_message_send(iucv->path, &txmsg, 0, 0,
+ (void *) skb->data, skb->len);
+ if (err) {
+ if (err == 3) {
+ user_id[8] = 0;
+ memcpy(user_id, iucv->dst_user_id, 8);
+ appl_id[8] = 0;
+ memcpy(appl_id, iucv->dst_name, 8);
+ pr_err("Application %s on z/VM guest %s"
+ " exceeds message limit\n",
+ appl_id, user_id);
+ err = -EAGAIN;
+ } else
+ err = -EPIPE;
+ skb_unlink(skb, &iucv->send_skb_q);
+ goto fail;
}
release_sock(sk);
@@ -1464,7 +1521,11 @@ static void iucv_callback_txdone(struct iucv_path *path,
spin_unlock_irqrestore(&list->lock, flags);
- kfree_skb(this);
+ if (this) {
+ kfree_skb(this);
+ /* wake up any process waiting for sending */
+ iucv_sock_wake_msglim(sk);
+ }
}
BUG_ON(!this);
generated by cgit v1.2.3 (git 2.25.1) at 2024-08-04 09:43:49 +0000