Merge branch 'strparser'

Tom Herbert says:

====================
strp: Stream parser for messages

This patch set introduces a utility for parsing application layer
protocol messages in a TCP stream. This is a generalization of the
mechanism implemented of Kernel Connection Multiplexor.

This patch set adapts KCM to use the strparser. We expect that kTLS
can use this mechanism also. RDS would probably be another candidate
to use a common stream parsing mechanism.

The API includes a context structure, a set of callbacks, utility
functions, and a data ready function. The callbacks include
a parse_msg function that is called to perform parsing (e.g.
BPF parsing in case of KCM), and a rcv_msg function that is called
when a full message has been completed.

For strparser we specify the return codes from the parser to allow
the backend to indicate that control of the socket should be
transferred back to userspace to handle some exceptions in the
stream: The return values are:

      >0 : indicates length of successfully parsed message
       0  : indicates more data must be received to parse the message
       -ESTRPIPE : current message should not be processed by the
          kernel, return control of the socket to userspace which
          can proceed to read the messages itself
       other < 0 : Error is parsing, give control back to userspace
          assuming that synchronization is lost and the stream
          is unrecoverable (application expected to close TCP socket)

There is one issue I haven't been able to fully resolve. If parse_msg
returns ESTRPIPE (wants control back to userspace) the parser may
already have consumed some bytes of the message. There is no way to
put bytes back into the TCP receive queue and tcp_read_sock does not
allow an easy way to peek messages. In lieu of a better solution, we
return ENODATA on the socket to indicate that the data stream is
unrecoverable (application needs to close socket). This condition
should only happen if an application layer message header is split
across two skbuffs and parsing just the first skbuff wasn't sufficient
to determine the that transfer to userspace is needed.

This patch set contains:

  - strparser implementation
  - changes to kcm to use strparser
  - strparser.txt documentation

v2:
  - Add copyright notice to C files
  - Remove GPL module license from strparser.c
  - Add report of rxpause

v3:
  - Restore GPL module license
  - Use EXPORT_SYMBOL_GPL

v4:
  - Removed unused function, changed another to be static as suggested
    by davem
  - Rewoked data_ready to be called from upper layer, no longer requires
    taking over socket data_ready callback as suggested by Lance Chao

Tested:
  - Ran a KCM thrash test for 24 hours. No behavioral or performance
    differences observed.
====================
Signed-off-by: David S. Miller <davem@davemloft.net>

Documentation/networking/strparser.txt

+Stream Parser
+-------------
+
+The stream parser (strparser) is a utility that parses messages of an
+application layer protocol running over a TCP connection. The stream
+parser works in conjunction with an upper layer in the kernel to provide
+kernel support for application layer messages. For instance, Kernel
+Connection Multiplexor (KCM) uses the Stream Parser to parse messages
+using a BPF program.
+
+Interface
+---------
+
+The API includes a context structure, a set of callbacks, utility
+functions, and a data_ready function. The callbacks include
+a parse_msg function that is called to perform parsing (e.g.
+BPF parsing in case of KCM), and a rcv_msg function that is called
+when a full message has been completed.
+
+A stream parser can be instantiated for a TCP connection. This is done
+by:
+
+strp_init(struct strparser *strp, struct sock *csk,
+	  struct strp_callbacks *cb)
+
+strp is a struct of type strparser that is allocated by the upper layer.
+csk is the TCP socket associated with the stream parser. Callbacks are
+called by the stream parser.
+
+Callbacks
+---------
+
+There are four callbacks:
+
+int (*parse_msg)(struct strparser *strp, struct sk_buff *skb);
+
+    parse_msg is called to determine the length of the next message
+    in the stream. The upper layer must implement this function. It
+    should parse the sk_buff as containing the headers for the
+    next application layer messages in the stream.
+
+    The skb->cb in the input skb is a struct strp_rx_msg. Only
+    the offset field is relevant in parse_msg and gives the offset
+    where the message starts in the skb.
+
+    The return values of this function are:
+
+    >0 : indicates length of successfully parsed message
+    0  : indicates more data must be received to parse the message
+    -ESTRPIPE : current message should not be processed by the
+          kernel, return control of the socket to userspace which
+          can proceed to read the messages itself
+    other < 0 : Error is parsing, give control back to userspace
+          assuming that synchronization is lost and the stream
+          is unrecoverable (application expected to close TCP socket)
+
+    In the case that an error is returned (return value is less than
+    zero) the stream parser will set the error on TCP socket and wake
+    it up. If parse_msg returned -ESTRPIPE and the stream parser had
+    previously read some bytes for the current message, then the error
+    set on the attached socket is ENODATA since the stream is
+    unrecoverable in that case.
+
+void (*rcv_msg)(struct strparser *strp, struct sk_buff *skb);
+
+    rcv_msg is called when a full message has been received and
+    is queued. The callee must consume the sk_buff; it can
+    call strp_pause to prevent any further messages from being
+    received in rcv_msg (see strp_pause below). This callback
+    must be set.
+
+    The skb->cb in the input skb is a struct strp_rx_msg. This
+    struct contains two fields: offset and full_len. Offset is
+    where the message starts in the skb, and full_len is the
+    the length of the message. skb->len - offset may be greater
+    then full_len since strparser does not trim the skb.
+
+int (*read_sock_done)(struct strparser *strp, int err);
+
+     read_sock_done is called when the stream parser is done reading
+     the TCP socket. The stream parser may read multiple messages
+     in a loop and this function allows cleanup to occur when existing
+     the loop. If the callback is not set (NULL in strp_init) a
+     default function is used.
+
+void (*abort_parser)(struct strparser *strp, int err);
+
+     This function is called when stream parser encounters an error
+     in parsing. The default function stops the stream parser for the
+     TCP socket and sets the error in the socket. The default function
+     can be changed by setting the callback to non-NULL in strp_init.
+
+Functions
+---------
+
+The upper layer calls strp_tcp_data_ready when data is ready on the lower
+socket for strparser to process. This should be called from a data_ready
+callback that is set on the socket.
+
+strp_stop is called to completely stop stream parser operations. This
+is called internally when the stream parser encounters an error, and
+it is called from the upper layer when unattaching a TCP socket.
+
+strp_done is called to unattach the stream parser from the TCP socket.
+This must be called after the stream processor has be stopped.
+
+strp_check_rcv is called to check for new messages on the socket. This
+is normally called at initialization of the a stream parser instance
+of after strp_unpause.
+
+Statistics
+----------
+
+Various counters are kept for each stream parser for a TCP socket.
+These are in the strp_stats structure. strp_aggr_stats is a convenience
+structure for accumulating statistics for multiple stream parser
+instances. save_strp_stats and aggregate_strp_stats are helper functions
+to save and aggregate statistics.
+
+Message assembly limits
+-----------------------
+
+The stream parser provide mechanisms to limit the resources consumed by
+message assembly.
+
+A timer is set when assembly starts for a new message. The message
+timeout is taken from rcvtime for the associated TCP socket. If the
+timer fires before assembly completes the stream parser is aborted
+and the ETIMEDOUT error is set on the TCP socket.
+
+Message length is limited to the receive buffer size of the associated
+TCP socket. If the length returned by parse_msg is greater than
+the socket buffer size then the stream parser is aborted with
+EMSGSIZE error set on the TCP socket. Note that this makes the
+maximum size of receive skbuffs for a socket with a stream parser
+to be 2*sk_rcvbuf of the TCP socket.

include/net/kcm.h

@@ -13,6 +13,7 @@
 
 #include <linux/skbuff.h>
 #include <net/sock.h>
+#include <net/strparser.h>
 #include <uapi/linux/kcm.h>
 
 extern unsigned int kcm_net_id;
@@ -21,16 +22,8 @@ extern unsigned int kcm_net_id;
 #define KCM_STATS_INCR(stat) ((stat)++)
 
 struct kcm_psock_stats {
-	unsigned long long rx_msgs;
-	unsigned long long rx_bytes;
 	unsigned long long tx_msgs;
 	unsigned long long tx_bytes;
-	unsigned int rx_aborts;
-	unsigned int rx_mem_fail;
-	unsigned int rx_need_more_hdr;
-	unsigned int rx_msg_too_big;
-	unsigned int rx_msg_timeouts;
-	unsigned int rx_bad_hdr_len;
 	unsigned long long reserved;
 	unsigned long long unreserved;
 	unsigned int tx_aborts;
@@ -64,13 +57,6 @@ struct kcm_tx_msg {
 	struct sk_buff *last_skb;
 };
 
-struct kcm_rx_msg {
-	int full_len;
-	int accum_len;
-	int offset;
-	int early_eaten;
-};
-
 /* Socket structure for KCM client sockets */
 struct kcm_sock {
 	struct sock sk;
@@ -87,6 +73,7 @@ struct kcm_sock {
 	struct work_struct tx_work;
 	struct list_head wait_psock_list;
 	struct sk_buff *seq_skb;
+	u32 tx_stopped : 1;
 
 	/* Don't use bit fields here, these are set under different locks */
 	bool tx_wait;
@@ -104,11 +91,11 @@ struct bpf_prog;
 /* Structure for an attached lower socket */
 struct kcm_psock {
 	struct sock *sk;
+	struct strparser strp;
 	struct kcm_mux *mux;
 	int index;
 
 	u32 tx_stopped : 1;
-	u32 rx_stopped : 1;
 	u32 done : 1;
 	u32 unattaching : 1;
 
@@ -121,18 +108,12 @@ struct kcm_psock {
 	struct kcm_psock_stats stats;
 
 	/* Receive */
-	struct sk_buff *rx_skb_head;
-	struct sk_buff **rx_skb_nextp;
-	struct sk_buff *ready_rx_msg;
 	struct list_head psock_ready_list;
-	struct work_struct rx_work;
-	struct delayed_work rx_delayed_work;
 	struct bpf_prog *bpf_prog;
 	struct kcm_sock *rx_kcm;
 	unsigned long long saved_rx_bytes;
 	unsigned long long saved_rx_msgs;
-	struct timer_list rx_msg_timer;
-	unsigned int rx_need_bytes;
+	struct sk_buff *ready_rx_msg;
 
 	/* Transmit */
 	struct kcm_sock *tx_kcm;
@@ -146,6 +127,7 @@ struct kcm_net {
 	struct mutex mutex;
 	struct kcm_psock_stats aggregate_psock_stats;
 	struct kcm_mux_stats aggregate_mux_stats;
+	struct strp_aggr_stats aggregate_strp_stats;
 	struct list_head mux_list;
 	int count;
 };
@@ -163,6 +145,7 @@ struct kcm_mux {
 
 	struct kcm_mux_stats stats;
 	struct kcm_psock_stats aggregate_psock_stats;
+	struct strp_aggr_stats aggregate_strp_stats;
 
 	/* Receive */
 	spinlock_t rx_lock ____cacheline_aligned_in_smp;
@@ -190,14 +173,6 @@ static inline void aggregate_psock_stats(struct kcm_psock_stats *stats,
 	/* Save psock statistics in the mux when psock is being unattached. */
 
 #define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)
-	SAVE_PSOCK_STATS(rx_msgs);
-	SAVE_PSOCK_STATS(rx_bytes);
-	SAVE_PSOCK_STATS(rx_aborts);
-	SAVE_PSOCK_STATS(rx_mem_fail);
-	SAVE_PSOCK_STATS(rx_need_more_hdr);
-	SAVE_PSOCK_STATS(rx_msg_too_big);
-	SAVE_PSOCK_STATS(rx_msg_timeouts);
-	SAVE_PSOCK_STATS(rx_bad_hdr_len);
 	SAVE_PSOCK_STATS(tx_msgs);
 	SAVE_PSOCK_STATS(tx_bytes);
 	SAVE_PSOCK_STATS(reserved);

include/net/strparser.h

+/*
+ * Stream Parser
+ *
+ * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+#ifndef __NET_STRPARSER_H_
+#define __NET_STRPARSER_H_
+
+#include <linux/skbuff.h>
+#include <net/sock.h>
+
+#define STRP_STATS_ADD(stat, count) ((stat) += (count))
+#define STRP_STATS_INCR(stat) ((stat)++)
+
+struct strp_stats {
+	unsigned long long rx_msgs;
+	unsigned long long rx_bytes;
+	unsigned int rx_mem_fail;
+	unsigned int rx_need_more_hdr;
+	unsigned int rx_msg_too_big;
+	unsigned int rx_msg_timeouts;
+	unsigned int rx_bad_hdr_len;
+};
+
+struct strp_aggr_stats {
+	unsigned long long rx_msgs;
+	unsigned long long rx_bytes;
+	unsigned int rx_mem_fail;
+	unsigned int rx_need_more_hdr;
+	unsigned int rx_msg_too_big;
+	unsigned int rx_msg_timeouts;
+	unsigned int rx_bad_hdr_len;
+	unsigned int rx_aborts;
+	unsigned int rx_interrupted;
+	unsigned int rx_unrecov_intr;
+};
+
+struct strparser;
+
+/* Callbacks are called with lock held for the attached socket */
+struct strp_callbacks {
+	int (*parse_msg)(struct strparser *strp, struct sk_buff *skb);
+	void (*rcv_msg)(struct strparser *strp, struct sk_buff *skb);
+	int (*read_sock_done)(struct strparser *strp, int err);
+	void (*abort_parser)(struct strparser *strp, int err);
+};
+
+struct strp_rx_msg {
+	int full_len;
+	int offset;
+};
+
+static inline struct strp_rx_msg *strp_rx_msg(struct sk_buff *skb)
+{
+	return (struct strp_rx_msg *)((void *)skb->cb +
+		offsetof(struct qdisc_skb_cb, data));
+}
+
+/* Structure for an attached lower socket */
+struct strparser {
+	struct sock *sk;
+
+	u32 rx_stopped : 1;
+	u32 rx_paused : 1;
+	u32 rx_aborted : 1;
+	u32 rx_interrupted : 1;
+	u32 rx_unrecov_intr : 1;
+
+	struct sk_buff **rx_skb_nextp;
+	struct timer_list rx_msg_timer;
+	struct sk_buff *rx_skb_head;
+	unsigned int rx_need_bytes;
+	struct delayed_work rx_delayed_work;
+	struct work_struct rx_work;
+	struct strp_stats stats;
+	struct strp_callbacks cb;
+};
+
+/* Must be called with lock held for attached socket */
+static inline void strp_pause(struct strparser *strp)
+{
+	strp->rx_paused = 1;
+}
+
+/* May be called without holding lock for attached socket */
+static inline void strp_unpause(struct strparser *strp)
+{
+	strp->rx_paused = 0;
+}
+
+static inline void save_strp_stats(struct strparser *strp,
+				   struct strp_aggr_stats *agg_stats)
+{
+	/* Save psock statistics in the mux when psock is being unattached. */
+
+#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat +=		\
+				 strp->stats._stat)
+	SAVE_PSOCK_STATS(rx_msgs);
+	SAVE_PSOCK_STATS(rx_bytes);
+	SAVE_PSOCK_STATS(rx_mem_fail);
+	SAVE_PSOCK_STATS(rx_need_more_hdr);
+	SAVE_PSOCK_STATS(rx_msg_too_big);
+	SAVE_PSOCK_STATS(rx_msg_timeouts);
+	SAVE_PSOCK_STATS(rx_bad_hdr_len);
+#undef SAVE_PSOCK_STATS
+
+	if (strp->rx_aborted)
+		agg_stats->rx_aborts++;
+	if (strp->rx_interrupted)
+		agg_stats->rx_interrupted++;
+	if (strp->rx_unrecov_intr)
+		agg_stats->rx_unrecov_intr++;
+}
+
+static inline void aggregate_strp_stats(struct strp_aggr_stats *stats,
+					struct strp_aggr_stats *agg_stats)
+{
+#define SAVE_PSOCK_STATS(_stat) (agg_stats->_stat += stats->_stat)
+	SAVE_PSOCK_STATS(rx_msgs);
+	SAVE_PSOCK_STATS(rx_bytes);
+	SAVE_PSOCK_STATS(rx_mem_fail);
+	SAVE_PSOCK_STATS(rx_need_more_hdr);
+	SAVE_PSOCK_STATS(rx_msg_too_big);
+	SAVE_PSOCK_STATS(rx_msg_timeouts);
+	SAVE_PSOCK_STATS(rx_bad_hdr_len);
+	SAVE_PSOCK_STATS(rx_aborts);
+	SAVE_PSOCK_STATS(rx_interrupted);
+	SAVE_PSOCK_STATS(rx_unrecov_intr);
+#undef SAVE_PSOCK_STATS
+
+}
+
+void strp_done(struct strparser *strp);
+void strp_stop(struct strparser *strp);
+void strp_check_rcv(struct strparser *strp);
+int strp_init(struct strparser *strp, struct sock *csk,
+	      struct strp_callbacks *cb);
+void strp_tcp_data_ready(struct strparser *strp);
+
+#endif /* __NET_STRPARSER_H_ */

net/Kconfig

@@ -369,6 +369,7 @@ source "net/irda/Kconfig"
 source "net/bluetooth/Kconfig"
 source "net/rxrpc/Kconfig"
 source "net/kcm/Kconfig"
+source "net/strparser/Kconfig"
 
 config FIB_RULES
 	bool

net/Makefile

@@ -35,6 +35,7 @@ obj-$(CONFIG_BT)		+= bluetooth/
 obj-$(CONFIG_SUNRPC)		+= sunrpc/
 obj-$(CONFIG_AF_RXRPC)		+= rxrpc/
 obj-$(CONFIG_AF_KCM)		+= kcm/
+obj-$(CONFIG_STREAM_PARSER)	+= strparser/
 obj-$(CONFIG_ATM)		+= atm/
 obj-$(CONFIG_L2TP)		+= l2tp/
 obj-$(CONFIG_DECNET)		+= decnet/

net/ipv6/ila/ila_common.c

@@ -172,6 +172,5 @@ static void __exit ila_fini(void)
 
 module_init(ila_init);
 module_exit(ila_fini);
-MODULE_ALIAS_RTNL_LWT(ILA);
 MODULE_AUTHOR("Tom Herbert <tom@herbertland.com>");
 MODULE_LICENSE("GPL");

net/kcm/Kconfig

@@ -3,6 +3,7 @@ config AF_KCM
 	tristate "KCM sockets"
 	depends on INET
 	select BPF_SYSCALL
+	select STREAM_PARSER
 	---help---
 	  KCM (Kernel Connection Multiplexor) sockets provide a method
 	  for multiplexing messages of a message based application

net/kcm/kcmproc.c

@@ -155,8 +155,8 @@ static void kcm_format_psock(struct kcm_psock *psock, struct seq_file *seq,
 	seq_printf(seq,
 		   "   psock-%-5u %-10llu %-16llu %-10llu %-16llu %-8d %-8d %-8d %-8d ",
 		   psock->index,
-		   psock->stats.rx_msgs,
-		   psock->stats.rx_bytes,
+		   psock->strp.stats.rx_msgs,
+		   psock->strp.stats.rx_bytes,
 		   psock->stats.tx_msgs,
 		   psock->stats.tx_bytes,
 		   psock->sk->sk_receive_queue.qlen,
@@ -170,9 +170,12 @@ static void kcm_format_psock(struct kcm_psock *psock, struct seq_file *seq,
 	if (psock->tx_stopped)
 		seq_puts(seq, "TxStop ");
 
-	if (psock->rx_stopped)
+	if (psock->strp.rx_stopped)
 		seq_puts(seq, "RxStop ");
 
+	if (psock->strp.rx_paused)
+		seq_puts(seq, "RxPause ");
+
 	if (psock->tx_kcm)
 		seq_printf(seq, "Rsvd-%d ", psock->tx_kcm->index);
 
@@ -275,6 +278,7 @@ static int kcm_stats_seq_show(struct seq_file *seq, void *v)
 {
 	struct kcm_psock_stats psock_stats;
 	struct kcm_mux_stats mux_stats;
+	struct strp_aggr_stats strp_stats;
 	struct kcm_mux *mux;
 	struct kcm_psock *psock;
 	struct net *net = seq->private;
@@ -282,20 +286,28 @@ static int kcm_stats_seq_show(struct seq_file *seq, void *v)
 
 	memset(&mux_stats, 0, sizeof(mux_stats));
 	memset(&psock_stats, 0, sizeof(psock_stats));
+	memset(&strp_stats, 0, sizeof(strp_stats));
 
 	mutex_lock(&knet->mutex);
 
 	aggregate_mux_stats(&knet->aggregate_mux_stats, &mux_stats);
 	aggregate_psock_stats(&knet->aggregate_psock_stats,
 			      &psock_stats);
+	aggregate_strp_stats(&knet->aggregate_strp_stats,
+			     &strp_stats);
 
 	list_for_each_entry_rcu(mux, &knet->mux_list, kcm_mux_list) {
 		spin_lock_bh(&mux->lock);
 		aggregate_mux_stats(&mux->stats, &mux_stats);
 		aggregate_psock_stats(&mux->aggregate_psock_stats,
 				      &psock_stats);
-		list_for_each_entry(psock, &mux->psocks, psock_list)
+		aggregate_strp_stats(&mux->aggregate_strp_stats,
+				     &strp_stats);
+		list_for_each_entry(psock, &mux->psocks, psock_list) {
 			aggregate_psock_stats(&psock->stats, &psock_stats);
+			save_strp_stats(&psock->strp, &strp_stats);
+		}
+
 		spin_unlock_bh(&mux->lock);
 	}
 
@@ -328,7 +340,7 @@ static int kcm_stats_seq_show(struct seq_file *seq, void *v)
 		   mux_stats.rx_ready_drops);
 
 	seq_printf(seq,
-		   "%-8s %-10s %-16s %-10s %-16s %-10s %-10s %-10s %-10s %-10s %-10s %-10s %-10s %-10s\n",
+		   "%-8s %-10s %-16s %-10s %-16s %-10s %-10s %-10s %-10s %-10s %-10s %-10s %-10s %-10s %-10s %-10s\n",
 		   "Psock",
 		   "RX-Msgs",
 		   "RX-Bytes",
@@ -337,6 +349,8 @@ static int kcm_stats_seq_show(struct seq_file *seq, void *v)
 		   "Reserved",
 		   "Unreserved",
 		   "RX-Aborts",
+		   "RX-Intr",
+		   "RX-Unrecov",
 		   "RX-MemFail",
 		   "RX-NeedMor",
 		   "RX-BadLen",
@@ -345,20 +359,22 @@ static int kcm_stats_seq_show(struct seq_file *seq, void *v)
 		   "TX-Aborts");
 
 	seq_printf(seq,
-		   "%-8s %-10llu %-16llu %-10llu %-16llu %-10llu %-10llu %-10u %-10u %-10u %-10u %-10u %-10u %-10u\n",
+		   "%-8s %-10llu %-16llu %-10llu %-16llu %-10llu %-10llu %-10u %-10u %-10u %-10u %-10u %-10u %-10u %-10u %-10u\n",
 		   "",
-		   psock_stats.rx_msgs,
-		   psock_stats.rx_bytes,
+		   strp_stats.rx_msgs,
+		   strp_stats.rx_bytes,
 		   psock_stats.tx_msgs,
 		   psock_stats.tx_bytes,
 		   psock_stats.reserved,
 		   psock_stats.unreserved,
-		   psock_stats.rx_aborts,
-		   psock_stats.rx_mem_fail,
-		   psock_stats.rx_need_more_hdr,
-		   psock_stats.rx_bad_hdr_len,
-		   psock_stats.rx_msg_too_big,
-		   psock_stats.rx_msg_timeouts,
+		   strp_stats.rx_aborts,
+		   strp_stats.rx_interrupted,
+		   strp_stats.rx_unrecov_intr,
+		   strp_stats.rx_mem_fail,
+		   strp_stats.rx_need_more_hdr,
+		   strp_stats.rx_bad_hdr_len,
+		   strp_stats.rx_msg_too_big,
+		   strp_stats.rx_msg_timeouts,
 		   psock_stats.tx_aborts);
 
 	return 0;

net/kcm/kcmsock.c

+/*
+ * Kernel Connection Multiplexor
+ *
+ * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
 #include <linux/bpf.h>
 #include <linux/errno.h>
 #include <linux/errqueue.h>
@@ -35,38 +45,12 @@ static inline struct kcm_tx_msg *kcm_tx_msg(struct sk_buff *skb)
 	return (struct kcm_tx_msg *)skb->cb;
 }
 
-static inline struct kcm_rx_msg *kcm_rx_msg(struct sk_buff *skb)
-{
-	return (struct kcm_rx_msg *)((void *)skb->cb +
-				     offsetof(struct qdisc_skb_cb, data));
-}
-
 static void report_csk_error(struct sock *csk, int err)
 {
 	csk->sk_err = EPIPE;
 	csk->sk_error_report(csk);
 }
 
-/* Callback lock held */
-static void kcm_abort_rx_psock(struct kcm_psock *psock, int err,
-			       struct sk_buff *skb)
-{
-	struct sock *csk = psock->sk;
-
-	/* Unrecoverable error in receive */
-
-	del_timer(&psock->rx_msg_timer);
-
-	if (psock->rx_stopped)
-		return;
-
-	psock->rx_stopped = 1;
-	KCM_STATS_INCR(psock->stats.rx_aborts);
-
-	/* Report an error on the lower socket */
-	report_csk_error(csk, err);
-}
-
 static void kcm_abort_tx_psock(struct kcm_psock *psock, int err,
 			       bool wakeup_kcm)
 {
@@ -109,12 +93,13 @@ static void kcm_abort_tx_psock(struct kcm_psock *psock, int err,
 static void kcm_update_rx_mux_stats(struct kcm_mux *mux,
 				    struct kcm_psock *psock)
 {
-	KCM_STATS_ADD(mux->stats.rx_bytes,
-		      psock->stats.rx_bytes - psock->saved_rx_bytes);
+	STRP_STATS_ADD(mux->stats.rx_bytes,
+		       psock->strp.stats.rx_bytes -
+		       psock->saved_rx_bytes);
 	mux->stats.rx_msgs +=
-		psock->stats.rx_msgs - psock->saved_rx_msgs;
-	psock->saved_rx_msgs = psock->stats.rx_msgs;
-	psock->saved_rx_bytes = psock->stats.rx_bytes;
+		psock->strp.stats.rx_msgs - psock->saved_rx_msgs;
+	psock->saved_rx_msgs = psock->strp.stats.rx_msgs;
+	psock->saved_rx_bytes = psock->strp.stats.rx_bytes;
 }
 
 static void kcm_update_tx_mux_stats(struct kcm_mux *mux,
@@ -167,11 +152,11 @@ static void kcm_rcv_ready(struct kcm_sock *kcm)
 		 */
 		list_del(&psock->psock_ready_list);
 		psock->ready_rx_msg = NULL;
-
 		/* Commit clearing of ready_rx_msg for queuing work */
 		smp_mb();
 
-		queue_work(kcm_wq, &psock->rx_work);
+		strp_unpause(&psock->strp);
+		strp_check_rcv(&psock->strp);
 	}
 
 	/* Buffer limit is okay now, add to ready list */
@@ -285,6 +270,7 @@ static struct kcm_sock *reserve_rx_kcm(struct kcm_psock *psock,
 
 	if (list_empty(&mux->kcm_rx_waiters)) {
 		psock->ready_rx_msg = head;
+		strp_pause(&psock->strp);
 		list_add_tail(&psock->psock_ready_list,
 			      &mux->psocks_ready);
 		spin_unlock_bh(&mux->rx_lock);
@@ -353,276 +339,6 @@ static void unreserve_rx_kcm(struct kcm_psock *psock,
 	spin_unlock_bh(&mux->rx_lock);
 }
 
-static void kcm_start_rx_timer(struct kcm_psock *psock)
-{
-	if (psock->sk->sk_rcvtimeo)
-		mod_timer(&psock->rx_msg_timer, psock->sk->sk_rcvtimeo);
-}
-
-/* Macro to invoke filter function. */
-#define KCM_RUN_FILTER(prog, ctx) \
-	(*prog->bpf_func)(ctx, prog->insnsi)
-
-/* Lower socket lock held */
-static int kcm_tcp_recv(read_descriptor_t *desc, struct sk_buff *orig_skb,
-			unsigned int orig_offset, size_t orig_len)
-{
-	struct kcm_psock *psock = (struct kcm_psock *)desc->arg.data;
-	struct kcm_rx_msg *rxm;
-	struct kcm_sock *kcm;
-	struct sk_buff *head, *skb;
-	size_t eaten = 0, cand_len;
-	ssize_t extra;
-	int err;
-	bool cloned_orig = false;
-
-	if (psock->ready_rx_msg)
-		return 0;
-
-	head = psock->rx_skb_head;
-	if (head) {
-		/* Message already in progress */
-
-		rxm = kcm_rx_msg(head);
-		if (unlikely(rxm->early_eaten)) {
-			/* Already some number of bytes on the receive sock
-			 * data saved in rx_skb_head, just indicate they
-			 * are consumed.
-			 */
-			eaten = orig_len <= rxm->early_eaten ?
-				orig_len : rxm->early_eaten;
-			rxm->early_eaten -= eaten;
-
-			return eaten;
-		}
-
-		if (unlikely(orig_offset)) {
-			/* Getting data with a non-zero offset when a message is
-			 * in progress is not expected. If it does happen, we
-			 * need to clone and pull since we can't deal with
-			 * offsets in the skbs for a message expect in the head.
-			 */
-			orig_skb = skb_clone(orig_skb, GFP_ATOMIC);
-			if (!orig_skb) {
-				KCM_STATS_INCR(psock->stats.rx_mem_fail);
-				desc->error = -ENOMEM;
-				return 0;
-			}
-			if (!pskb_pull(orig_skb, orig_offset)) {
-				KCM_STATS_INCR(psock->stats.rx_mem_fail);
-				kfree_skb(orig_skb);
-				desc->error = -ENOMEM;
-				return 0;
-			}
-			cloned_orig = true;
-			orig_offset = 0;
-		}
-
-		if (!psock->rx_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) {
-				KCM_STATS_INCR(psock->stats.rx_mem_fail);
-				desc->error = err;
-				return 0;
-			}
-
-			if (unlikely(skb_shinfo(head)->frag_list)) {
-				/* We can't append to an sk_buff that already
-				 * has a frag_list. We create a new head, point
-				 * the frag_list of that to the old head, and
-				 * then are able to use the old head->next for
-				 * appending to the message.
-				 */
-				if (WARN_ON(head->next)) {
-					desc->error = -EINVAL;
-					return 0;
-				}
-
-				skb = alloc_skb(0, GFP_ATOMIC);
-				if (!skb) {
-					KCM_STATS_INCR(psock->stats.rx_mem_fail);
-					desc->error = -ENOMEM;
-					return 0;
-				}
-				skb->len = head->len;
-				skb->data_len = head->len;
-				skb->truesize = head->truesize;
-				*kcm_rx_msg(skb) = *kcm_rx_msg(head);
-				psock->rx_skb_nextp = &head->next;
-				skb_shinfo(skb)->frag_list = head;
-				psock->rx_skb_head = skb;
-				head = skb;
-			} else {
-				psock->rx_skb_nextp =
-				    &skb_shinfo(head)->frag_list;
-			}
-		}
-	}
-
-	while (eaten < orig_len) {
-		/* Always clone since we will consume something */
-		skb = skb_clone(orig_skb, GFP_ATOMIC);
-		if (!skb) {
-			KCM_STATS_INCR(psock->stats.rx_mem_fail);
-			desc->error = -ENOMEM;
-			break;
-		}
-
-		cand_len = orig_len - eaten;
-
-		head = psock->rx_skb_head;
-		if (!head) {
-			head = skb;
-			psock->rx_skb_head = head;
-			/* Will set rx_skb_nextp on next packet if needed */
-			psock->rx_skb_nextp = NULL;
-			rxm = kcm_rx_msg(head);
-			memset(rxm, 0, sizeof(*rxm));
-			rxm->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) {
-				KCM_STATS_INCR(psock->stats.rx_mem_fail);
-				desc->error = err;
-				break;
-			}
-
-			rxm = kcm_rx_msg(head);
-			*psock->rx_skb_nextp = skb;
-			psock->rx_skb_nextp = &skb->next;
-			head->data_len += skb->len;
-			head->len += skb->len;
-			head->truesize += skb->truesize;
-		}
-
-		if (!rxm->full_len) {
-			ssize_t len;
-
-			len = KCM_RUN_FILTER(psock->bpf_prog, head);
-
-			if (!len) {
-				/* Need more header to determine length */
-				if (!rxm->accum_len) {
-					/* Start RX timer for new message */
-					kcm_start_rx_timer(psock);
-				}
-				rxm->accum_len += cand_len;
-				eaten += cand_len;
-				KCM_STATS_INCR(psock->stats.rx_need_more_hdr);
-				WARN_ON(eaten != orig_len);
-				break;
-			} else if (len > psock->sk->sk_rcvbuf) {
-				/* Message length exceeds maximum allowed */
-				KCM_STATS_INCR(psock->stats.rx_msg_too_big);
-				desc->error = -EMSGSIZE;
-				psock->rx_skb_head = NULL;
-				kcm_abort_rx_psock(psock, EMSGSIZE, head);
-				break;
-			} else if (len <= (ssize_t)head->len -
-					  skb->len - rxm->offset) {
-				/* Length must be into new skb (and also
-				 * greater than zero)
-				 */
-				KCM_STATS_INCR(psock->stats.rx_bad_hdr_len);
-				desc->error = -EPROTO;
-				psock->rx_skb_head = NULL;
-				kcm_abort_rx_psock(psock, EPROTO, head);
-				break;
-			}
-
-			rxm->full_len = len;
-		}
-
-		extra = (ssize_t)(rxm->accum_len + cand_len) - rxm->full_len;
-
-		if (extra < 0) {
-			/* Message not complete yet. */
-			if (rxm->full_len - rxm->accum_len >
-			    tcp_inq(psock->sk)) {
-				/* Don't have the whole messages in the socket
-				 * buffer. Set psock->rx_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 tcp_read_sock.
-				 */
-
-				if (!rxm->accum_len) {
-					/* Start RX timer for new message */
-					kcm_start_rx_timer(psock);
-				}
-
-				psock->rx_need_bytes = rxm->full_len -
-						       rxm->accum_len;
-				rxm->accum_len += cand_len;
-				rxm->early_eaten = cand_len;
-				KCM_STATS_ADD(psock->stats.rx_bytes, cand_len);
-				desc->count = 0; /* Stop reading socket */
-				break;
-			}
-			rxm->accum_len += cand_len;
-			eaten += cand_len;
-			WARN_ON(eaten != orig_len);
-			break;
-		}
-
-		/* Positive extra indicates ore bytes than needed for the
-		 * message
-		 */
-
-		WARN_ON(extra > cand_len);
-
-		eaten += (cand_len - extra);
-
-		/* Hurray, we have a new message! */
-		del_timer(&psock->rx_msg_timer);
-		psock->rx_skb_head = NULL;
-		KCM_STATS_INCR(psock->stats.rx_msgs);
-
-try_queue:
-		kcm = reserve_rx_kcm(psock, head);
-		if (!kcm) {
-			/* Unable to reserve a KCM, message is held in psock. */
-			break;
-		}
-
-		if (kcm_queue_rcv_skb(&kcm->sk, head)) {
-			/* Should mean socket buffer full */
-			unreserve_rx_kcm(psock, false);
-			goto try_queue;
-		}
-	}
-
-	if (cloned_orig)
-		kfree_skb(orig_skb);
-
-	KCM_STATS_ADD(psock->stats.rx_bytes, eaten);
-
-	return eaten;
-}
-
-/* Called with lock held on lower socket */
-static int psock_tcp_read_sock(struct kcm_psock *psock)
-{
-	read_descriptor_t desc;
-
-	desc.arg.data = psock;
-	desc.error = 0;
-	desc.count = 1; /* give more than one skb per call */
-
-	/* sk should be locked here, so okay to do tcp_read_sock */
-	tcp_read_sock(psock->sk, &desc, kcm_tcp_recv);
-
-	unreserve_rx_kcm(psock, true);
-
-	return desc.error;
-}
-
 /* Lower sock lock held */
 static void psock_tcp_data_ready(struct sock *sk)
 {
@@ -631,65 +347,49 @@ static void psock_tcp_data_ready(struct sock *sk)
 	read_lock_bh(&sk->sk_callback_lock);
 
 	psock = (struct kcm_psock *)sk->sk_user_data;
-	if (unlikely(!psock || psock->rx_stopped))
-		goto out;
-
-	if (psock->ready_rx_msg)
-		goto out;
-
-	if (psock->rx_need_bytes) {
-		if (tcp_inq(sk) >= psock->rx_need_bytes)
-			psock->rx_need_bytes = 0;
-		else
-			goto out;
-	}
-
-	if (psock_tcp_read_sock(psock) == -ENOMEM)
-		queue_delayed_work(kcm_wq, &psock->rx_delayed_work, 0);
+	if (likely(psock))
+		strp_tcp_data_ready(&psock->strp);
 
-out:
 	read_unlock_bh(&sk->sk_callback_lock);
 }
 
-static void do_psock_rx_work(struct kcm_psock *psock)
+/* Called with lower sock held */
+static void kcm_rcv_strparser(struct strparser *strp, struct sk_buff *skb)
 {
-	read_descriptor_t rd_desc;
-	struct sock *csk = psock->sk;
-
-	/* We need the read lock to synchronize with psock_tcp_data_ready. We
-	 * need the socket lock for calling tcp_read_sock.
-	 */
-	lock_sock(csk);
-	read_lock_bh(&csk->sk_callback_lock);
-
-	if (unlikely(csk->sk_user_data != psock))
-		goto out;
-
-	if (unlikely(psock->rx_stopped))
-		goto out;
-
-	if (psock->ready_rx_msg)
-		goto out;
-
-	rd_desc.arg.data = psock;
+	struct kcm_psock *psock = container_of(strp, struct kcm_psock, strp);
+	struct kcm_sock *kcm;
 
-	if (psock_tcp_read_sock(psock) == -ENOMEM)
-		queue_delayed_work(kcm_wq, &psock->rx_delayed_work, 0);
+try_queue:
+	kcm = reserve_rx_kcm(psock, skb);
+	if (!kcm) {
+		 /* Unable to reserve a KCM, message is held in psock and strp
+		  * is paused.
+		  */
+		return;
+	}
 
-out:
-	read_unlock_bh(&csk->sk_callback_lock);
-	release_sock(csk);
+	if (kcm_queue_rcv_skb(&kcm->sk, skb)) {
+		/* Should mean socket buffer full */
+		unreserve_rx_kcm(psock, false);
+		goto try_queue;
+	}
 }
 
-static void psock_rx_work(struct work_struct *w)
+static int kcm_parse_func_strparser(struct strparser *strp, struct sk_buff *skb)
 {
-	do_psock_rx_work(container_of(w, struct kcm_psock, rx_work));
+	struct kcm_psock *psock = container_of(strp, struct kcm_psock, strp);
+	struct bpf_prog *prog = psock->bpf_prog;
+
+	return (*prog->bpf_func)(skb, prog->insnsi);
 }
 
-static void psock_rx_delayed_work(struct work_struct *w)
+static int kcm_read_sock_done(struct strparser *strp, int err)
 {
-	do_psock_rx_work(container_of(w, struct kcm_psock,
-				      rx_delayed_work.work));
+	struct kcm_psock *psock = container_of(strp, struct kcm_psock, strp);
+
+	unreserve_rx_kcm(psock, true);
+
+	return err;
 }
 
 static void psock_tcp_state_change(struct sock *sk)
@@ -713,14 +413,13 @@ static void psock_tcp_write_space(struct sock *sk)
 	psock = (struct kcm_psock *)sk->sk_user_data;
 	if (unlikely(!psock))
 		goto out;
-
 	mux = psock->mux;
 
 	spin_lock_bh(&mux->lock);
 
 	/* Check if the socket is reserved so someone is waiting for sending. */
 	kcm = psock->tx_kcm;
-	if (kcm)
+	if (kcm && !unlikely(kcm->tx_stopped))
 		queue_work(kcm_wq, &kcm->tx_work);
 
 	spin_unlock_bh(&mux->lock);
@@ -1411,7 +1110,7 @@ static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
 	struct kcm_sock *kcm = kcm_sk(sk);
 	int err = 0;
 	long timeo;
-	struct kcm_rx_msg *rxm;
+	struct strp_rx_msg *rxm;
 	int copied = 0;
 	struct sk_buff *skb;
 
@@ -1425,7 +1124,7 @@ static int kcm_recvmsg(struct socket *sock, struct msghdr *msg,
 
 	/* Okay, have a message on the receive queue */
 
-	rxm = kcm_rx_msg(skb);
+	rxm = strp_rx_msg(skb);
 
 	if (len > rxm->full_len)
 		len = rxm->full_len;
@@ -1481,7 +1180,7 @@ static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
 	struct sock *sk = sock->sk;
 	struct kcm_sock *kcm = kcm_sk(sk);
 	long timeo;
-	struct kcm_rx_msg *rxm;
+	struct strp_rx_msg *rxm;
 	int err = 0;
 	ssize_t copied;
 	struct sk_buff *skb;
@@ -1498,7 +1197,7 @@ static ssize_t kcm_splice_read(struct socket *sock, loff_t *ppos,
 
 	/* Okay, have a message on the receive queue */
 
-	rxm = kcm_rx_msg(skb);
+	rxm = strp_rx_msg(skb);
 
 	if (len > rxm->full_len)
 		len = rxm->full_len;
@@ -1674,15 +1373,6 @@ static void init_kcm_sock(struct kcm_sock *kcm, struct kcm_mux *mux)
 	spin_unlock_bh(&mux->rx_lock);
 }
 
-static void kcm_rx_msg_timeout(unsigned long arg)
-{
-	struct kcm_psock *psock = (struct kcm_psock *)arg;
-
-	/* Message assembly timed out */
-	KCM_STATS_INCR(psock->stats.rx_msg_timeouts);
-	kcm_abort_rx_psock(psock, ETIMEDOUT, NULL);
-}
-
 static int kcm_attach(struct socket *sock, struct socket *csock,
 		      struct bpf_prog *prog)
 {
@@ -1692,6 +1382,7 @@ static int kcm_attach(struct socket *sock, struct socket *csock,
 	struct kcm_psock *psock = NULL, *tpsock;
 	struct list_head *head;
 	int index = 0;
+	struct strp_callbacks cb;
 
 	if (csock->ops->family != PF_INET &&
 	    csock->ops->family != PF_INET6)
@@ -1713,11 +1404,12 @@ static int kcm_attach(struct socket *sock, struct socket *csock,
 	psock->sk = csk;
 	psock->bpf_prog = prog;
 
-	setup_timer(&psock->rx_msg_timer, kcm_rx_msg_timeout,
-		    (unsigned long)psock);
+	cb.rcv_msg = kcm_rcv_strparser;
+	cb.abort_parser = NULL;
+	cb.parse_msg = kcm_parse_func_strparser;
+	cb.read_sock_done = kcm_read_sock_done;
 
-	INIT_WORK(&psock->rx_work, psock_rx_work);
-	INIT_DELAYED_WORK(&psock->rx_delayed_work, psock_rx_delayed_work);
+	strp_init(&psock->strp, csk, &cb);
 
 	sock_hold(csk);
 
@@ -1750,7 +1442,7 @@ static int kcm_attach(struct socket *sock, struct socket *csock,
 	spin_unlock_bh(&mux->lock);
 
 	/* Schedule RX work in case there are already bytes queued */
-	queue_work(kcm_wq, &psock->rx_work);
+	strp_check_rcv(&psock->strp);
 
 	return 0;
 }
@@ -1785,6 +1477,7 @@ static int kcm_attach_ioctl(struct socket *sock, struct kcm_attach *info)
 	return err;
 }
 
+/* Lower socket lock held */
 static void kcm_unattach(struct kcm_psock *psock)
 {
 	struct sock *csk = psock->sk;
@@ -1798,7 +1491,7 @@ static void kcm_unattach(struct kcm_psock *psock)
 	csk->sk_data_ready = psock->save_data_ready;
 	csk->sk_write_space = psock->save_write_space;
 	csk->sk_state_change = psock->save_state_change;
-	psock->rx_stopped = 1;
+	strp_stop(&psock->strp);
 
 	if (WARN_ON(psock->rx_kcm)) {
 		write_unlock_bh(&csk->sk_callback_lock);
@@ -1821,18 +1514,14 @@ static void kcm_unattach(struct kcm_psock *psock)
 
 	write_unlock_bh(&csk->sk_callback_lock);
 
-	del_timer_sync(&psock->rx_msg_timer);
-	cancel_work_sync(&psock->rx_work);
-	cancel_delayed_work_sync(&psock->rx_delayed_work);
+	strp_done(&psock->strp);
 
 	bpf_prog_put(psock->bpf_prog);
 
-	kfree_skb(psock->rx_skb_head);
-	psock->rx_skb_head = NULL;
-
 	spin_lock_bh(&mux->lock);
 
 	aggregate_psock_stats(&psock->stats, &mux->aggregate_psock_stats);
+	save_strp_stats(&psock->strp, &mux->aggregate_strp_stats);
 
 	KCM_STATS_INCR(mux->stats.psock_unattach);
 
@@ -1915,6 +1604,7 @@ static int kcm_unattach_ioctl(struct socket *sock, struct kcm_unattach *info)
 
 		spin_unlock_bh(&mux->lock);
 
+		/* Lower socket lock should already be held */
 		kcm_unattach(psock);
 
 		err = 0;
@@ -2059,8 +1749,11 @@ static void release_mux(struct kcm_mux *mux)
 	/* Release psocks */
 	list_for_each_entry_safe(psock, tmp_psock,
 				 &mux->psocks, psock_list) {
-		if (!WARN_ON(psock->unattaching))
+		if (!WARN_ON(psock->unattaching)) {
+			lock_sock(psock->strp.sk);
 			kcm_unattach(psock);
+			release_sock(psock->strp.sk);
+		}
 	}
 
 	if (WARN_ON(mux->psocks_cnt))
@@ -2072,6 +1765,8 @@ static void release_mux(struct kcm_mux *mux)
 	aggregate_mux_stats(&mux->stats, &knet->aggregate_mux_stats);
 	aggregate_psock_stats(&mux->aggregate_psock_stats,
 			      &knet->aggregate_psock_stats);
+	aggregate_strp_stats(&mux->aggregate_strp_stats,
+			     &knet->aggregate_strp_stats);
 	list_del_rcu(&mux->kcm_mux_list);
 	knet->count--;
 	mutex_unlock(&knet->mutex);
@@ -2151,6 +1846,13 @@ static int kcm_release(struct socket *sock)
 	 * it will just return.
 	 */
 	__skb_queue_purge(&sk->sk_write_queue);
+
+	/* Set tx_stopped. This is checked when psock is bound to a kcm and we
+	 * get a writespace callback. This prevents further work being queued
+	 * from the callback (unbinding the psock occurs after canceling work.
+	 */
+	kcm->tx_stopped = 1;
+
 	release_sock(sk);
 
 	spin_lock_bh(&mux->lock);

net/strparser/Kconfig

+
+config STREAM_PARSER
+	tristate
+	default n

net/strparser/Makefile

+obj-$(CONFIG_STREAM_PARSER) += strparser.o

net/strparser/strparser.c

+/*
+ * Stream Parser
+ *
+ * Copyright (c) 2016 Tom Herbert <tom@herbertland.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation.
+ */
+
+#include <linux/bpf.h>
+#include <linux/errno.h>
+#include <linux/errqueue.h>
+#include <linux/file.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/poll.h>
+#include <linux/rculist.h>
+#include <linux/skbuff.h>
+#include <linux/socket.h>
+#include <linux/uaccess.h>
+#include <linux/workqueue.h>
+#include <net/strparser.h>
+#include <net/netns/generic.h>
+#include <net/sock.h>
+#include <net/tcp.h>
+
+static struct workqueue_struct *strp_wq;
+
+struct _strp_rx_msg {
+	/* Internal cb structure. struct strp_rx_msg must be first for passing
+	 * to upper layer.
+	 */
+	struct strp_rx_msg strp;
+	int accum_len;
+	int early_eaten;
+};
+
+static inline struct _strp_rx_msg *_strp_rx_msg(struct sk_buff *skb)
+{
+	return (struct _strp_rx_msg *)((void *)skb->cb +
+		offsetof(struct qdisc_skb_cb, data));
+}
+
+/* Lower lock held */
+static void strp_abort_rx_strp(struct strparser *strp, int err)
+{
+	struct sock *csk = strp->sk;
+
+	/* Unrecoverable error in receive */
+
+	del_timer(&strp->rx_msg_timer);
+
+	if (strp->rx_stopped)
+		return;
+
+	strp->rx_stopped = 1;
+
+	/* Report an error on the lower socket */
+	csk->sk_err = err;
+	csk->sk_error_report(csk);
+}
+
+static void strp_start_rx_timer(struct strparser *strp)
+{
+	if (strp->sk->sk_rcvtimeo)
+		mod_timer(&strp->rx_msg_timer, strp->sk->sk_rcvtimeo);
+}
+
+/* Lower lock held */
+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;
+	strp->cb.abort_parser(strp, err);
+}
+
+/* Lower socket lock held */
+static int strp_tcp_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;
+	struct _strp_rx_msg *rxm;
+	struct sk_buff *head, *skb;
+	size_t eaten = 0, cand_len;
+	ssize_t extra;
+	int err;
+	bool cloned_orig = false;
+
+	if (strp->rx_paused)
+		return 0;
+
+	head = strp->rx_skb_head;
+	if (head) {
+		/* Message already in progress */
+
+		rxm = _strp_rx_msg(head);
+		if (unlikely(rxm->early_eaten)) {
+			/* Already some number of bytes on the receive sock
+			 * data saved in rx_skb_head, just indicate they
+			 * are consumed.
+			 */
+			eaten = orig_len <= rxm->early_eaten ?
+				orig_len : rxm->early_eaten;
+			rxm->early_eaten -= eaten;
+
+			return eaten;
+		}
+
+		if (unlikely(orig_offset)) {
+			/* Getting data with a non-zero offset when a message is
+			 * in progress is not expected. If it does happen, we
+			 * need to clone and pull since we can't deal with
+			 * offsets in the skbs for a message expect in the head.
+			 */
+			orig_skb = skb_clone(orig_skb, GFP_ATOMIC);
+			if (!orig_skb) {
+				STRP_STATS_INCR(strp->stats.rx_mem_fail);
+				desc->error = -ENOMEM;
+				return 0;
+			}
+			if (!pskb_pull(orig_skb, orig_offset)) {
+				STRP_STATS_INCR(strp->stats.rx_mem_fail);
+				kfree_skb(orig_skb);
+				desc->error = -ENOMEM;
+				return 0;
+			}
+			cloned_orig = true;
+			orig_offset = 0;
+		}
+
+		if (!strp->rx_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);
+				desc->error = err;
+				return 0;
+			}
+
+			if (unlikely(skb_shinfo(head)->frag_list)) {
+				/* We can't append to an sk_buff that already
+				 * has a frag_list. We create a new head, point
+				 * the frag_list of that to the old head, and
+				 * then are able to use the old head->next for
+				 * appending to the message.
+				 */
+				if (WARN_ON(head->next)) {
+					desc->error = -EINVAL;
+					return 0;
+				}
+
+				skb = alloc_skb(0, GFP_ATOMIC);
+				if (!skb) {
+					STRP_STATS_INCR(strp->stats.rx_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;
+				skb_shinfo(skb)->frag_list = head;
+				strp->rx_skb_head = skb;
+				head = skb;
+			} else {
+				strp->rx_skb_nextp =
+				    &skb_shinfo(head)->frag_list;
+			}
+		}
+	}
+
+	while (eaten < orig_len) {
+		/* Always clone since we will consume something */
+		skb = skb_clone(orig_skb, GFP_ATOMIC);
+		if (!skb) {
+			STRP_STATS_INCR(strp->stats.rx_mem_fail);
+			desc->error = -ENOMEM;
+			break;
+		}
+
+		cand_len = orig_len - eaten;
+
+		head = strp->rx_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;
+		} 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);
+				desc->error = err;
+				break;
+			}
+
+			rxm = _strp_rx_msg(head);
+			*strp->rx_skb_nextp = skb;
+			strp->rx_skb_nextp = &skb->next;
+			head->data_len += skb->len;
+			head->len += skb->len;
+			head->truesize += skb->truesize;
+		}
+
+		if (!rxm->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) {
+					/* Start RX timer for new message */
+					strp_start_rx_timer(strp);
+				}
+				rxm->accum_len += cand_len;
+				eaten += cand_len;
+				STRP_STATS_INCR(strp->stats.rx_need_more_hdr);
+				WARN_ON(eaten != orig_len);
+				break;
+			} else if (len < 0) {
+				if (len == -ESTRPIPE && rxm->accum_len) {
+					len = -ENODATA;
+					strp->rx_unrecov_intr = 1;
+				} else {
+					strp->rx_interrupted = 1;
+				}
+				strp_parser_err(strp, err, desc);
+				break;
+			} else if (len > strp->sk->sk_rcvbuf) {
+				/* Message length exceeds maximum allowed */
+				STRP_STATS_INCR(strp->stats.rx_msg_too_big);
+				strp_parser_err(strp, -EMSGSIZE, desc);
+				break;
+			} else if (len <= (ssize_t)head->len -
+					  skb->len - rxm->strp.offset) {
+				/* Length must be into new skb (and also
+				 * greater than zero)
+				 */
+				STRP_STATS_INCR(strp->stats.rx_bad_hdr_len);
+				strp_parser_err(strp, -EPROTO, desc);
+				break;
+			}
+
+			rxm->strp.full_len = len;
+		}
+
+		extra = (ssize_t)(rxm->accum_len + cand_len) -
+			rxm->strp.full_len;
+
+		if (extra < 0) {
+			/* Message not complete yet. */
+			if (rxm->strp.full_len - rxm->accum_len >
+			    tcp_inq(strp->sk)) {
+				/* Don't have the whole messages in the socket
+				 * buffer. Set strp->rx_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 tcp_read_sock.
+				 */
+
+				if (!rxm->accum_len) {
+					/* Start RX timer for new message */
+					strp_start_rx_timer(strp);
+				}
+
+				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);
+				desc->count = 0; /* Stop reading socket */
+				break;
+			}
+			rxm->accum_len += cand_len;
+			eaten += cand_len;
+			WARN_ON(eaten != orig_len);
+			break;
+		}
+
+		/* Positive extra indicates ore bytes than needed for the
+		 * message
+		 */
+
+		WARN_ON(extra > cand_len);
+
+		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);
+
+		/* Give skb to upper layer */
+		strp->cb.rcv_msg(strp, head);
+
+		if (unlikely(strp->rx_paused)) {
+			/* Upper layer paused strp */
+			break;
+		}
+	}
+
+	if (cloned_orig)
+		kfree_skb(orig_skb);
+
+	STRP_STATS_ADD(strp->stats.rx_bytes, eaten);
+
+	return eaten;
+}
+
+static int default_read_sock_done(struct strparser *strp, int err)
+{
+	return err;
+}
+
+/* Called with lock held on lower socket */
+static int strp_tcp_read_sock(struct strparser *strp)
+{
+	read_descriptor_t desc;
+
+	desc.arg.data = strp;
+	desc.error = 0;
+	desc.count = 1; /* give more than one skb per call */
+
+	/* sk should be locked here, so okay to do tcp_read_sock */
+	tcp_read_sock(strp->sk, &desc, strp_tcp_recv);
+
+	desc.error = strp->cb.read_sock_done(strp, desc.error);
+
+	return desc.error;
+}
+
+/* Lower sock lock held */
+void strp_tcp_data_ready(struct strparser *strp)
+{
+	struct sock *csk = strp->sk;
+
+	if (unlikely(strp->rx_stopped))
+		return;
+
+	/* This check is needed to synchronize with do_strp_rx_work.
+	 * do_strp_rx_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(csk)) {
+		queue_work(strp_wq, &strp->rx_work);
+		return;
+	}
+
+	if (strp->rx_paused)
+		return;
+
+	if (strp->rx_need_bytes) {
+		if (tcp_inq(csk) >= strp->rx_need_bytes)
+			strp->rx_need_bytes = 0;
+		else
+			return;
+	}
+
+	if (strp_tcp_read_sock(strp) == -ENOMEM)
+		queue_work(strp_wq, &strp->rx_work);
+}
+EXPORT_SYMBOL_GPL(strp_tcp_data_ready);
+
+static void do_strp_rx_work(struct strparser *strp)
+{
+	read_descriptor_t rd_desc;
+	struct sock *csk = strp->sk;
+
+	/* We need the read lock to synchronize with strp_tcp_data_ready. We
+	 * need the socket lock for calling tcp_read_sock.
+	 */
+	lock_sock(csk);
+
+	if (unlikely(csk->sk_user_data != strp))
+		goto out;
+
+	if (unlikely(strp->rx_stopped))
+		goto out;
+
+	if (strp->rx_paused)
+		goto out;
+
+	rd_desc.arg.data = strp;
+
+	if (strp_tcp_read_sock(strp) == -ENOMEM)
+		queue_work(strp_wq, &strp->rx_work);
+
+out:
+	release_sock(csk);
+}
+
+static void strp_rx_work(struct work_struct *w)
+{
+	do_strp_rx_work(container_of(w, struct strparser, rx_work));
+}
+
+static void strp_rx_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->cb.abort_parser(strp, ETIMEDOUT);
+	release_sock(strp->sk);
+}
+
+int strp_init(struct strparser *strp, struct sock *csk,
+	      struct strp_callbacks *cb)
+{
+	if (!cb || !cb->rcv_msg || !cb->parse_msg)
+		return -EINVAL;
+
+	memset(strp, 0, sizeof(*strp));
+
+	strp->sk = csk;
+
+	setup_timer(&strp->rx_msg_timer, strp_rx_msg_timeout,
+		    (unsigned long)strp);
+
+	INIT_WORK(&strp->rx_work, strp_rx_work);
+
+	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;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(strp_init);
+
+/* strp must already be stopped so that strp_tcp_recv will no longer be called.
+ * Note that strp_done is not called with the lower socket held.
+ */
+void strp_done(struct strparser *strp)
+{
+	WARN_ON(!strp->rx_stopped);
+
+	del_timer_sync(&strp->rx_msg_timer);
+	cancel_work_sync(&strp->rx_work);
+
+	if (strp->rx_skb_head) {
+		kfree_skb(strp->rx_skb_head);
+		strp->rx_skb_head = NULL;
+	}
+}
+EXPORT_SYMBOL_GPL(strp_done);
+
+void strp_stop(struct strparser *strp)
+{
+	strp->rx_stopped = 1;
+}
+EXPORT_SYMBOL_GPL(strp_stop);
+
+void strp_check_rcv(struct strparser *strp)
+{
+	queue_work(strp_wq, &strp->rx_work);
+}
+EXPORT_SYMBOL_GPL(strp_check_rcv);
+
+static int __init strp_mod_init(void)
+{
+	strp_wq = create_singlethread_workqueue("kstrp");
+
+	return 0;
+}
+
+static void __exit strp_mod_exit(void)
+{
+}
+module_init(strp_mod_init);
+module_exit(strp_mod_exit);
+MODULE_LICENSE("GPL");