include/net/inet_frag.h

Source file repositories/reference/linux-study-clean/include/net/inet_frag.h

File Facts

System
Linux kernel
Corpus path
include/net/inet_frag.h
Extension
.h
Size
5062 bytes
Lines
183
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: implementation source
Status
source implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct fqdir {
	/* sysctls */
	long			high_thresh;
	long			low_thresh;
	int			timeout;
	int			max_dist;
	struct inet_frags	*f;
	struct net		*net;
	bool			dead;

	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;
	struct work_struct	destroy_work;
	struct llist_node	free_list;
};

/**
 * enum: 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
 * @INET_FRAG_HASH_DEAD: inet_frag_kill() has not removed fq from rhashtable
 * @INET_FRAG_DROP: if skbs must be dropped (instead of being consumed)
 */
enum {
	INET_FRAG_FIRST_IN	= BIT(0),
	INET_FRAG_LAST_IN	= BIT(1),
	INET_FRAG_COMPLETE	= BIT(2),
	INET_FRAG_HASH_DEAD	= BIT(3),
	INET_FRAG_DROP		= BIT(4),
};

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
 * @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
 * @tstamp_type: stamp has a mono delivery time (EDT)
 * @flags: fragment queue flags
 * @max_size: maximum received fragment size
 * @fqdir: pointer to struct fqdir
 * @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 rb_root		rb_fragments;
	struct sk_buff		*fragments_tail;
	struct sk_buff		*last_run_head;
	ktime_t			stamp;
	int			len;
	int			meat;
	u8			tstamp_type;
	__u8			flags;
	u16			max_size;

Annotation

Implementation Notes