v4.19.13 snapshot.
diff --git a/include/net/strparser.h b/include/net/strparser.h
new file mode 100644
index 0000000..f177c87
--- /dev/null
+++ b/include/net/strparser.h
@@ -0,0 +1,148 @@
+/*
+ * 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 msgs;
+ unsigned long long bytes;
+ unsigned int mem_fail;
+ unsigned int need_more_hdr;
+ unsigned int msg_too_big;
+ unsigned int msg_timeouts;
+ unsigned int bad_hdr_len;
+};
+
+struct strp_aggr_stats {
+ unsigned long long msgs;
+ unsigned long long bytes;
+ unsigned int mem_fail;
+ unsigned int need_more_hdr;
+ unsigned int msg_too_big;
+ unsigned int msg_timeouts;
+ unsigned int bad_hdr_len;
+ unsigned int aborts;
+ unsigned int interrupted;
+ unsigned int 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);
+ void (*lock)(struct strparser *strp);
+ void (*unlock)(struct strparser *strp);
+};
+
+struct strp_msg {
+ int full_len;
+ int offset;
+};
+
+static inline struct strp_msg *strp_msg(struct sk_buff *skb)
+{
+ return (struct strp_msg *)((void *)skb->cb +
+ offsetof(struct qdisc_skb_cb, data));
+}
+
+/* Structure for an attached lower socket */
+struct strparser {
+ struct sock *sk;
+
+ u32 stopped : 1;
+ u32 paused : 1;
+ u32 aborted : 1;
+ u32 interrupted : 1;
+ u32 unrecov_intr : 1;
+
+ struct sk_buff **skb_nextp;
+ struct sk_buff *skb_head;
+ unsigned int need_bytes;
+ struct delayed_work msg_timer_work;
+ struct work_struct 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->paused = 1;
+}
+
+/* May be called without holding lock for attached socket */
+void strp_unpause(struct strparser *strp);
+/* Must be called with process lock held (lock_sock) */
+void __strp_unpause(struct strparser *strp);
+
+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(msgs);
+ SAVE_PSOCK_STATS(bytes);
+ SAVE_PSOCK_STATS(mem_fail);
+ SAVE_PSOCK_STATS(need_more_hdr);
+ SAVE_PSOCK_STATS(msg_too_big);
+ SAVE_PSOCK_STATS(msg_timeouts);
+ SAVE_PSOCK_STATS(bad_hdr_len);
+#undef SAVE_PSOCK_STATS
+
+ if (strp->aborted)
+ agg_stats->aborts++;
+ if (strp->interrupted)
+ agg_stats->interrupted++;
+ if (strp->unrecov_intr)
+ agg_stats->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(msgs);
+ SAVE_PSOCK_STATS(bytes);
+ SAVE_PSOCK_STATS(mem_fail);
+ SAVE_PSOCK_STATS(need_more_hdr);
+ SAVE_PSOCK_STATS(msg_too_big);
+ SAVE_PSOCK_STATS(msg_timeouts);
+ SAVE_PSOCK_STATS(bad_hdr_len);
+ SAVE_PSOCK_STATS(aborts);
+ SAVE_PSOCK_STATS(interrupted);
+ SAVE_PSOCK_STATS(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 *sk,
+ const struct strp_callbacks *cb);
+void strp_data_ready(struct strparser *strp);
+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);
+
+#endif /* __NET_STRPARSER_H_ */