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inet: frags: enum the flag definitions and add descriptions

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Move the flags to an enum definion, swap FIRST_IN/LAST_IN to be in increasing
order and add comments explaining each flag and the inet_frag_queue struct
members.

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2014-08-01 12:29:45 +02:00 • committed by David S. Miller
parent 06aa8b8a03
commit 1ab1934ed8
1 changed files with 35 additions and 11 deletions
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46
include/net/inet_frag.h
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@ -15,25 +15,49 @@ struct netns_frags {
int low_thresh; int low_thresh;
}; };
/**
* 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_EVICTED: frag queue is being evicted
*/
enum {
INET_FRAG_FIRST_IN = BIT(0),
INET_FRAG_LAST_IN = BIT(1),
INET_FRAG_COMPLETE = BIT(2),
INET_FRAG_EVICTED = BIT(3)
};
/**
* struct inet_frag_queue - fragment queue
*
* @lock: spinlock protecting the queue
* @timer: queue expiration timer
* @list: hash bucket list
* @refcnt: reference count of the queue
* @fragments: received fragments head
* @fragments_tail: received fragments tail
* @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: (ipv4 only) maximum received fragment size with IP_DF set
* @net: namespace that this frag belongs to
*/
struct inet_frag_queue { struct inet_frag_queue {
spinlock_t lock; spinlock_t lock;
struct timer_list timer; /* when will this queue expire? */ struct timer_list timer;
struct hlist_node list; struct hlist_node list;
atomic_t refcnt; atomic_t refcnt;
struct sk_buff *fragments; /* list of received fragments */ struct sk_buff *fragments;
struct sk_buff *fragments_tail; struct sk_buff *fragments_tail;
ktime_t stamp; ktime_t stamp;
int len; /* total length of orig datagram */ int len;
int meat; int meat;
__u8 flags; /* first/last segment arrived? */ __u8 flags;
#define INET_FRAG_EVICTED 8
#define INET_FRAG_COMPLETE 4
#define INET_FRAG_FIRST_IN 2
#define INET_FRAG_LAST_IN 1
u16 max_size; u16 max_size;
struct netns_frags *net; struct netns_frags *net;
}; };