v4.19.13 snapshot.
diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h
new file mode 100644
index 0000000..1662cbc
--- /dev/null
+++ b/include/net/inet_frag.h
@@ -0,0 +1,156 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __NET_FRAG_H__
+#define __NET_FRAG_H__
+
+#include <linux/rhashtable-types.h>
+
+struct netns_frags {
+ /* sysctls */
+ long high_thresh;
+ long low_thresh;
+ int timeout;
+ int max_dist;
+ struct inet_frags *f;
+
+ struct rhashtable rhashtable ____cacheline_aligned_in_smp;
+
+ /* Keep atomic mem on separate cachelines in structs that include it */
+ atomic_long_t mem ____cacheline_aligned_in_smp;
+};
+
+/**
+ * fragment queue flags
+ *
+ * @INET_FRAG_FIRST_IN: first fragment has arrived
+ * @INET_FRAG_LAST_IN: final fragment has arrived
+ * @INET_FRAG_COMPLETE: frag queue has been processed and is due for destruction
+ */
+enum {
+ INET_FRAG_FIRST_IN = BIT(0),
+ INET_FRAG_LAST_IN = BIT(1),
+ INET_FRAG_COMPLETE = BIT(2),
+};
+
+struct frag_v4_compare_key {
+ __be32 saddr;
+ __be32 daddr;
+ u32 user;
+ u32 vif;
+ __be16 id;
+ u16 protocol;
+};
+
+struct frag_v6_compare_key {
+ struct in6_addr saddr;
+ struct in6_addr daddr;
+ u32 user;
+ __be32 id;
+ u32 iif;
+};
+
+/**
+ * struct inet_frag_queue - fragment queue
+ *
+ * @node: rhash node
+ * @key: keys identifying this frag.
+ * @timer: queue expiration timer
+ * @lock: spinlock protecting this frag
+ * @refcnt: reference count of the queue
+ * @fragments: received fragments head
+ * @rb_fragments: received fragments rb-tree root
+ * @fragments_tail: received fragments tail
+ * @last_run_head: the head of the last "run". see ip_fragment.c
+ * @stamp: timestamp of the last received fragment
+ * @len: total length of the original datagram
+ * @meat: length of received fragments so far
+ * @flags: fragment queue flags
+ * @max_size: maximum received fragment size
+ * @net: namespace that this frag belongs to
+ * @rcu: rcu head for freeing deferall
+ */
+struct inet_frag_queue {
+ struct rhash_head node;
+ union {
+ struct frag_v4_compare_key v4;
+ struct frag_v6_compare_key v6;
+ } key;
+ struct timer_list timer;
+ spinlock_t lock;
+ refcount_t refcnt;
+ struct sk_buff *fragments; /* Used in IPv6. */
+ struct rb_root rb_fragments; /* Used in IPv4. */
+ struct sk_buff *fragments_tail;
+ struct sk_buff *last_run_head;
+ ktime_t stamp;
+ int len;
+ int meat;
+ __u8 flags;
+ u16 max_size;
+ struct netns_frags *net;
+ struct rcu_head rcu;
+};
+
+struct inet_frags {
+ unsigned int qsize;
+
+ void (*constructor)(struct inet_frag_queue *q,
+ const void *arg);
+ void (*destructor)(struct inet_frag_queue *);
+ void (*frag_expire)(struct timer_list *t);
+ struct kmem_cache *frags_cachep;
+ const char *frags_cache_name;
+ struct rhashtable_params rhash_params;
+};
+
+int inet_frags_init(struct inet_frags *);
+void inet_frags_fini(struct inet_frags *);
+
+static inline int inet_frags_init_net(struct netns_frags *nf)
+{
+ atomic_long_set(&nf->mem, 0);
+ return rhashtable_init(&nf->rhashtable, &nf->f->rhash_params);
+}
+void inet_frags_exit_net(struct netns_frags *nf);
+
+void inet_frag_kill(struct inet_frag_queue *q);
+void inet_frag_destroy(struct inet_frag_queue *q);
+struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, void *key);
+
+/* Free all skbs in the queue; return the sum of their truesizes. */
+unsigned int inet_frag_rbtree_purge(struct rb_root *root);
+
+static inline void inet_frag_put(struct inet_frag_queue *q)
+{
+ if (refcount_dec_and_test(&q->refcnt))
+ inet_frag_destroy(q);
+}
+
+/* Memory Tracking Functions. */
+
+static inline long frag_mem_limit(const struct netns_frags *nf)
+{
+ return atomic_long_read(&nf->mem);
+}
+
+static inline void sub_frag_mem_limit(struct netns_frags *nf, long val)
+{
+ atomic_long_sub(val, &nf->mem);
+}
+
+static inline void add_frag_mem_limit(struct netns_frags *nf, long val)
+{
+ atomic_long_add(val, &nf->mem);
+}
+
+/* RFC 3168 support :
+ * We want to check ECN values of all fragments, do detect invalid combinations.
+ * In ipq->ecn, we store the OR value of each ip4_frag_ecn() fragment value.
+ */
+#define IPFRAG_ECN_NOT_ECT 0x01 /* one frag had ECN_NOT_ECT */
+#define IPFRAG_ECN_ECT_1 0x02 /* one frag had ECN_ECT_1 */
+#define IPFRAG_ECN_ECT_0 0x04 /* one frag had ECN_ECT_0 */
+#define IPFRAG_ECN_CE 0x08 /* one frag had ECN_CE */
+
+extern const u8 ip_frag_ecn_table[16];
+
+#endif