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Diffstat (limited to 'net/strparser/strparser.c')
-rw-r--r--net/strparser/strparser.c313
1 files changed, 187 insertions, 126 deletions
diff --git a/net/strparser/strparser.c b/net/strparser/strparser.c
index b5c279b22680..0d18fbc6f870 100644
--- a/net/strparser/strparser.c
+++ b/net/strparser/strparser.c
@@ -29,44 +29,46 @@
static struct workqueue_struct *strp_wq;
-struct _strp_rx_msg {
- /* Internal cb structure. struct strp_rx_msg must be first for passing
+struct _strp_msg {
+ /* Internal cb structure. struct strp_msg must be first for passing
* to upper layer.
*/
- struct strp_rx_msg strp;
+ struct strp_msg strp;
int accum_len;
int early_eaten;
};
-static inline struct _strp_rx_msg *_strp_rx_msg(struct sk_buff *skb)
+static inline struct _strp_msg *_strp_msg(struct sk_buff *skb)
{
- return (struct _strp_rx_msg *)((void *)skb->cb +
+ return (struct _strp_msg *)((void *)skb->cb +
offsetof(struct qdisc_skb_cb, data));
}
/* Lower lock held */
-static void strp_abort_rx_strp(struct strparser *strp, int err)
+static void strp_abort_strp(struct strparser *strp, int err)
{
- struct sock *csk = strp->sk;
-
/* Unrecoverable error in receive */
- del_timer(&strp->rx_msg_timer);
+ del_timer(&strp->msg_timer);
- if (strp->rx_stopped)
+ if (strp->stopped)
return;
- strp->rx_stopped = 1;
+ strp->stopped = 1;
+
+ if (strp->sk) {
+ struct sock *sk = strp->sk;
- /* Report an error on the lower socket */
- csk->sk_err = err;
- csk->sk_error_report(csk);
+ /* Report an error on the lower socket */
+ sk->sk_err = err;
+ sk->sk_error_report(sk);
+ }
}
-static void strp_start_rx_timer(struct strparser *strp)
+static void strp_start_timer(struct strparser *strp, long timeo)
{
- if (strp->sk->sk_rcvtimeo)
- mod_timer(&strp->rx_msg_timer, strp->sk->sk_rcvtimeo);
+ if (timeo)
+ mod_timer(&strp->msg_timer, timeo);
}
/* Lower lock held */
@@ -74,46 +76,55 @@ static void strp_parser_err(struct strparser *strp, int err,
read_descriptor_t *desc)
{
desc->error = err;
- kfree_skb(strp->rx_skb_head);
- strp->rx_skb_head = NULL;
+ kfree_skb(strp->skb_head);
+ strp->skb_head = NULL;
strp->cb.abort_parser(strp, err);
}
static inline int strp_peek_len(struct strparser *strp)
{
- struct socket *sock = strp->sk->sk_socket;
+ if (strp->sk) {
+ struct socket *sock = strp->sk->sk_socket;
+
+ return sock->ops->peek_len(sock);
+ }
+
+ /* If we don't have an associated socket there's nothing to peek.
+ * Return int max to avoid stopping the strparser.
+ */
- return sock->ops->peek_len(sock);
+ return INT_MAX;
}
/* Lower socket lock held */
-static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
- unsigned int orig_offset, size_t orig_len)
+static int __strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
+ unsigned int orig_offset, size_t orig_len,
+ size_t max_msg_size, long timeo)
{
struct strparser *strp = (struct strparser *)desc->arg.data;
- struct _strp_rx_msg *rxm;
+ struct _strp_msg *stm;
struct sk_buff *head, *skb;
size_t eaten = 0, cand_len;
ssize_t extra;
int err;
bool cloned_orig = false;
- if (strp->rx_paused)
+ if (strp->paused)
return 0;
- head = strp->rx_skb_head;
+ head = strp->skb_head;
if (head) {
/* Message already in progress */
- rxm = _strp_rx_msg(head);
- if (unlikely(rxm->early_eaten)) {
+ stm = _strp_msg(head);
+ if (unlikely(stm->early_eaten)) {
/* Already some number of bytes on the receive sock
- * data saved in rx_skb_head, just indicate they
+ * data saved in skb_head, just indicate they
* are consumed.
*/
- eaten = orig_len <= rxm->early_eaten ?
- orig_len : rxm->early_eaten;
- rxm->early_eaten -= eaten;
+ eaten = orig_len <= stm->early_eaten ?
+ orig_len : stm->early_eaten;
+ stm->early_eaten -= eaten;
return eaten;
}
@@ -126,12 +137,12 @@ static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
*/
orig_skb = skb_clone(orig_skb, GFP_ATOMIC);
if (!orig_skb) {
- STRP_STATS_INCR(strp->stats.rx_mem_fail);
+ STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = -ENOMEM;
return 0;
}
if (!pskb_pull(orig_skb, orig_offset)) {
- STRP_STATS_INCR(strp->stats.rx_mem_fail);
+ STRP_STATS_INCR(strp->stats.mem_fail);
kfree_skb(orig_skb);
desc->error = -ENOMEM;
return 0;
@@ -140,13 +151,13 @@ static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
orig_offset = 0;
}
- if (!strp->rx_skb_nextp) {
+ if (!strp->skb_nextp) {
/* We are going to append to the frags_list of head.
* Need to unshare the frag_list.
*/
err = skb_unclone(head, GFP_ATOMIC);
if (err) {
- STRP_STATS_INCR(strp->stats.rx_mem_fail);
+ STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = err;
return 0;
}
@@ -165,20 +176,20 @@ static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
skb = alloc_skb(0, GFP_ATOMIC);
if (!skb) {
- STRP_STATS_INCR(strp->stats.rx_mem_fail);
+ STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = -ENOMEM;
return 0;
}
skb->len = head->len;
skb->data_len = head->len;
skb->truesize = head->truesize;
- *_strp_rx_msg(skb) = *_strp_rx_msg(head);
- strp->rx_skb_nextp = &head->next;
+ *_strp_msg(skb) = *_strp_msg(head);
+ strp->skb_nextp = &head->next;
skb_shinfo(skb)->frag_list = head;
- strp->rx_skb_head = skb;
+ strp->skb_head = skb;
head = skb;
} else {
- strp->rx_skb_nextp =
+ strp->skb_nextp =
&skb_shinfo(head)->frag_list;
}
}
@@ -188,112 +199,112 @@ static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
/* Always clone since we will consume something */
skb = skb_clone(orig_skb, GFP_ATOMIC);
if (!skb) {
- STRP_STATS_INCR(strp->stats.rx_mem_fail);
+ STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = -ENOMEM;
break;
}
cand_len = orig_len - eaten;
- head = strp->rx_skb_head;
+ head = strp->skb_head;
if (!head) {
head = skb;
- strp->rx_skb_head = head;
- /* Will set rx_skb_nextp on next packet if needed */
- strp->rx_skb_nextp = NULL;
- rxm = _strp_rx_msg(head);
- memset(rxm, 0, sizeof(*rxm));
- rxm->strp.offset = orig_offset + eaten;
+ strp->skb_head = head;
+ /* Will set skb_nextp on next packet if needed */
+ strp->skb_nextp = NULL;
+ stm = _strp_msg(head);
+ memset(stm, 0, sizeof(*stm));
+ stm->strp.offset = orig_offset + eaten;
} else {
/* Unclone since we may be appending to an skb that we
* already share a frag_list with.
*/
err = skb_unclone(skb, GFP_ATOMIC);
if (err) {
- STRP_STATS_INCR(strp->stats.rx_mem_fail);
+ STRP_STATS_INCR(strp->stats.mem_fail);
desc->error = err;
break;
}
- rxm = _strp_rx_msg(head);
- *strp->rx_skb_nextp = skb;
- strp->rx_skb_nextp = &skb->next;
+ stm = _strp_msg(head);
+ *strp->skb_nextp = skb;
+ strp->skb_nextp = &skb->next;
head->data_len += skb->len;
head->len += skb->len;
head->truesize += skb->truesize;
}
- if (!rxm->strp.full_len) {
+ if (!stm->strp.full_len) {
ssize_t len;
len = (*strp->cb.parse_msg)(strp, head);
if (!len) {
/* Need more header to determine length */
- if (!rxm->accum_len) {
+ if (!stm->accum_len) {
/* Start RX timer for new message */
- strp_start_rx_timer(strp);
+ strp_start_timer(strp, timeo);
}
- rxm->accum_len += cand_len;
+ stm->accum_len += cand_len;
eaten += cand_len;
- STRP_STATS_INCR(strp->stats.rx_need_more_hdr);
+ STRP_STATS_INCR(strp->stats.need_more_hdr);
WARN_ON(eaten != orig_len);
break;
} else if (len < 0) {
- if (len == -ESTRPIPE && rxm->accum_len) {
+ if (len == -ESTRPIPE && stm->accum_len) {
len = -ENODATA;
- strp->rx_unrecov_intr = 1;
+ strp->unrecov_intr = 1;
} else {
- strp->rx_interrupted = 1;
+ strp->interrupted = 1;
}
strp_parser_err(strp, len, desc);
break;
- } else if (len > strp->sk->sk_rcvbuf) {
+ } else if (len > max_msg_size) {
/* Message length exceeds maximum allowed */
- STRP_STATS_INCR(strp->stats.rx_msg_too_big);
+ STRP_STATS_INCR(strp->stats.msg_too_big);
strp_parser_err(strp, -EMSGSIZE, desc);
break;
} else if (len <= (ssize_t)head->len -
- skb->len - rxm->strp.offset) {
+ skb->len - stm->strp.offset) {
/* Length must be into new skb (and also
* greater than zero)
*/
- STRP_STATS_INCR(strp->stats.rx_bad_hdr_len);
+ STRP_STATS_INCR(strp->stats.bad_hdr_len);
strp_parser_err(strp, -EPROTO, desc);
break;
}
- rxm->strp.full_len = len;
+ stm->strp.full_len = len;
}
- extra = (ssize_t)(rxm->accum_len + cand_len) -
- rxm->strp.full_len;
+ extra = (ssize_t)(stm->accum_len + cand_len) -
+ stm->strp.full_len;
if (extra < 0) {
/* Message not complete yet. */
- if (rxm->strp.full_len - rxm->accum_len >
+ if (stm->strp.full_len - stm->accum_len >
strp_peek_len(strp)) {
- /* Don't have the whole messages in the socket
- * buffer. Set strp->rx_need_bytes to wait for
+ /* Don't have the whole message in the socket
+ * buffer. Set strp->need_bytes to wait for
* the rest of the message. Also, set "early
* eaten" since we've already buffered the skb
* but don't consume yet per strp_read_sock.
*/
- if (!rxm->accum_len) {
+ if (!stm->accum_len) {
/* Start RX timer for new message */
- strp_start_rx_timer(strp);
+ strp_start_timer(strp, timeo);
}
- strp->rx_need_bytes = rxm->strp.full_len -
- rxm->accum_len;
- rxm->accum_len += cand_len;
- rxm->early_eaten = cand_len;
- STRP_STATS_ADD(strp->stats.rx_bytes, cand_len);
+ strp->need_bytes = stm->strp.full_len -
+ stm->accum_len;
+ stm->accum_len += cand_len;
+ stm->early_eaten = cand_len;
+ STRP_STATS_ADD(strp->stats.bytes, cand_len);
desc->count = 0; /* Stop reading socket */
break;
}
- rxm->accum_len += cand_len;
+ stm->accum_len += cand_len;
eaten += cand_len;
WARN_ON(eaten != orig_len);
break;
@@ -308,14 +319,14 @@ static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
eaten += (cand_len - extra);
/* Hurray, we have a new message! */
- del_timer(&strp->rx_msg_timer);
- strp->rx_skb_head = NULL;
- STRP_STATS_INCR(strp->stats.rx_msgs);
+ del_timer(&strp->msg_timer);
+ strp->skb_head = NULL;
+ STRP_STATS_INCR(strp->stats.msgs);
/* Give skb to upper layer */
strp->cb.rcv_msg(strp, head);
- if (unlikely(strp->rx_paused)) {
+ if (unlikely(strp->paused)) {
/* Upper layer paused strp */
break;
}
@@ -324,11 +335,33 @@ static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
if (cloned_orig)
kfree_skb(orig_skb);
- STRP_STATS_ADD(strp->stats.rx_bytes, eaten);
+ STRP_STATS_ADD(strp->stats.bytes, eaten);
return eaten;
}
+int strp_process(struct strparser *strp, struct sk_buff *orig_skb,
+ unsigned int orig_offset, size_t orig_len,
+ size_t max_msg_size, long timeo)
+{
+ read_descriptor_t desc; /* Dummy arg to strp_recv */
+
+ desc.arg.data = strp;
+
+ return __strp_recv(&desc, orig_skb, orig_offset, orig_len,
+ max_msg_size, timeo);
+}
+EXPORT_SYMBOL_GPL(strp_process);
+
+static int strp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
+ unsigned int orig_offset, size_t orig_len)
+{
+ struct strparser *strp = (struct strparser *)desc->arg.data;
+
+ return __strp_recv(desc, orig_skb, orig_offset, orig_len,
+ strp->sk->sk_rcvbuf, strp->sk->sk_rcvtimeo);
+}
+
static int default_read_sock_done(struct strparser *strp, int err)
{
return err;
@@ -355,101 +388,129 @@ static int strp_read_sock(struct strparser *strp)
/* Lower sock lock held */
void strp_data_ready(struct strparser *strp)
{
- if (unlikely(strp->rx_stopped))
+ if (unlikely(strp->stopped))
return;
- /* This check is needed to synchronize with do_strp_rx_work.
- * do_strp_rx_work acquires a process lock (lock_sock) whereas
+ /* This check is needed to synchronize with do_strp_work.
+ * do_strp_work acquires a process lock (lock_sock) whereas
* the lock held here is bh_lock_sock. The two locks can be
* held by different threads at the same time, but bh_lock_sock
* allows a thread in BH context to safely check if the process
* lock is held. In this case, if the lock is held, queue work.
*/
if (sock_owned_by_user(strp->sk)) {
- queue_work(strp_wq, &strp->rx_work);
+ queue_work(strp_wq, &strp->work);
return;
}
- if (strp->rx_paused)
+ if (strp->paused)
return;
- if (strp->rx_need_bytes) {
- if (strp_peek_len(strp) >= strp->rx_need_bytes)
- strp->rx_need_bytes = 0;
+ if (strp->need_bytes) {
+ if (strp_peek_len(strp) >= strp->need_bytes)
+ strp->need_bytes = 0;
else
return;
}
if (strp_read_sock(strp) == -ENOMEM)
- queue_work(strp_wq, &strp->rx_work);
+ queue_work(strp_wq, &strp->work);
}
EXPORT_SYMBOL_GPL(strp_data_ready);
-static void do_strp_rx_work(struct strparser *strp)
+static void do_strp_work(struct strparser *strp)
{
read_descriptor_t rd_desc;
- struct sock *csk = strp->sk;
/* We need the read lock to synchronize with strp_data_ready. We
* need the socket lock for calling strp_read_sock.
*/
- lock_sock(csk);
+ strp->cb.lock(strp);
- if (unlikely(strp->rx_stopped))
+ if (unlikely(strp->stopped))
goto out;
- if (strp->rx_paused)
+ if (strp->paused)
goto out;
rd_desc.arg.data = strp;
if (strp_read_sock(strp) == -ENOMEM)
- queue_work(strp_wq, &strp->rx_work);
+ queue_work(strp_wq, &strp->work);
out:
- release_sock(csk);
+ strp->cb.unlock(strp);
}
-static void strp_rx_work(struct work_struct *w)
+static void strp_work(struct work_struct *w)
{
- do_strp_rx_work(container_of(w, struct strparser, rx_work));
+ do_strp_work(container_of(w, struct strparser, work));
}
-static void strp_rx_msg_timeout(unsigned long arg)
+static void strp_msg_timeout(unsigned long arg)
{
struct strparser *strp = (struct strparser *)arg;
/* Message assembly timed out */
- STRP_STATS_INCR(strp->stats.rx_msg_timeouts);
- lock_sock(strp->sk);
+ STRP_STATS_INCR(strp->stats.msg_timeouts);
+ strp->cb.lock(strp);
strp->cb.abort_parser(strp, ETIMEDOUT);
+ strp->cb.unlock(strp);
+}
+
+static void strp_sock_lock(struct strparser *strp)
+{
+ lock_sock(strp->sk);
+}
+
+static void strp_sock_unlock(struct strparser *strp)
+{
release_sock(strp->sk);
}
-int strp_init(struct strparser *strp, struct sock *csk,
+int strp_init(struct strparser *strp, struct sock *sk,
struct strp_callbacks *cb)
{
- struct socket *sock = csk->sk_socket;
if (!cb || !cb->rcv_msg || !cb->parse_msg)
return -EINVAL;
- if (!sock->ops->read_sock || !sock->ops->peek_len)
- return -EAFNOSUPPORT;
+ /* The sk (sock) arg determines the mode of the stream parser.
+ *
+ * If the sock is set then the strparser is in receive callback mode.
+ * The upper layer calls strp_data_ready to kick receive processing
+ * and strparser calls the read_sock function on the socket to
+ * get packets.
+ *
+ * If the sock is not set then the strparser is in general mode.
+ * The upper layer calls strp_process for each skb to be parsed.
+ */
- memset(strp, 0, sizeof(*strp));
+ if (sk) {
+ struct socket *sock = sk->sk_socket;
- strp->sk = csk;
+ if (!sock->ops->read_sock || !sock->ops->peek_len)
+ return -EAFNOSUPPORT;
+ } else {
+ if (!cb->lock || !cb->unlock)
+ return -EINVAL;
+ }
- setup_timer(&strp->rx_msg_timer, strp_rx_msg_timeout,
- (unsigned long)strp);
+ memset(strp, 0, sizeof(*strp));
- INIT_WORK(&strp->rx_work, strp_rx_work);
+ strp->sk = sk;
+ strp->cb.lock = cb->lock ? : strp_sock_lock;
+ strp->cb.unlock = cb->unlock ? : strp_sock_unlock;
strp->cb.rcv_msg = cb->rcv_msg;
strp->cb.parse_msg = cb->parse_msg;
strp->cb.read_sock_done = cb->read_sock_done ? : default_read_sock_done;
- strp->cb.abort_parser = cb->abort_parser ? : strp_abort_rx_strp;
+ strp->cb.abort_parser = cb->abort_parser ? : strp_abort_strp;
+
+ setup_timer(&strp->msg_timer, strp_msg_timeout,
+ (unsigned long)strp);
+
+ INIT_WORK(&strp->work, strp_work);
return 0;
}
@@ -457,12 +518,12 @@ EXPORT_SYMBOL_GPL(strp_init);
void strp_unpause(struct strparser *strp)
{
- strp->rx_paused = 0;
+ strp->paused = 0;
- /* Sync setting rx_paused with RX work */
+ /* Sync setting paused with RX work */
smp_mb();
- queue_work(strp_wq, &strp->rx_work);
+ queue_work(strp_wq, &strp->work);
}
EXPORT_SYMBOL_GPL(strp_unpause);
@@ -471,27 +532,27 @@ EXPORT_SYMBOL_GPL(strp_unpause);
*/
void strp_done(struct strparser *strp)
{
- WARN_ON(!strp->rx_stopped);
+ WARN_ON(!strp->stopped);
- del_timer_sync(&strp->rx_msg_timer);
- cancel_work_sync(&strp->rx_work);
+ del_timer_sync(&strp->msg_timer);
+ cancel_work_sync(&strp->work);
- if (strp->rx_skb_head) {
- kfree_skb(strp->rx_skb_head);
- strp->rx_skb_head = NULL;
+ if (strp->skb_head) {
+ kfree_skb(strp->skb_head);
+ strp->skb_head = NULL;
}
}
EXPORT_SYMBOL_GPL(strp_done);
void strp_stop(struct strparser *strp)
{
- strp->rx_stopped = 1;
+ strp->stopped = 1;
}
EXPORT_SYMBOL_GPL(strp_stop);
void strp_check_rcv(struct strparser *strp)
{
- queue_work(strp_wq, &strp->rx_work);
+ queue_work(strp_wq, &strp->work);
}
EXPORT_SYMBOL_GPL(strp_check_rcv);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 21:22:18 +0000