PAL.C.T MINI SHELL
#ifndef __NET_FRAG_H__
#define __NET_FRAG_H__
#include <linux/rbtree.h>
/* RedHat kABI: cannot change netns_frags, because its is part of
* structs netns_ipv4, netns_ipv6 and netns_nf_frag. Which in turn
* is part of (include/net/net_namespace.h) struct net.
*/
struct netns_frags {
/* Compile time catch, elements in struct that are not used any longer */
#ifdef __GENKSYMS__
int nqueues;
atomic_t mem;
#else
int nqueues_kabi_build_err_not_used;
atomic_t mem_kabi_build_err_not_used;
#endif
/* RedHat abusing lru_list.next pointer for kABI workaround */
struct list_head lru_list;
/* sysctls */
int timeout;
int high_thresh;
int low_thresh;
};
struct netns_frags_priv {
struct list_head lru_list;
spinlock_t lru_lock;
int nqueues;
/* Its important for performance to keep lru_list and mem on
* separate cachelines
*/
atomic_t mem ____cacheline_aligned_in_smp;
};
#define netns_frags_priv(nf) ((struct netns_frags_priv *)(nf)->lru_list.next)
struct inet_frag_queue {
spinlock_t lock;
struct timer_list timer; /* when will this queue expire? */
struct list_head lru_list; /* lru list member */
struct hlist_node list;
atomic_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; /* total length of orig datagram */
int meat;
__u8 last_in; /* first/last segment arrived? */
#define INET_FRAG_COMPLETE 4
#define INET_FRAG_FIRST_IN 2
#define INET_FRAG_LAST_IN 1
u16 max_size;
struct netns_frags *net;
};
#define INETFRAGS_HASHSZ 1024
struct inet_frag_bucket {
struct hlist_head chain;
spinlock_t chain_lock;
};
struct inet_frags {
struct inet_frag_bucket hash[INETFRAGS_HASHSZ];
/* This rwlock is a global lock (seperate per IPv4, IPv6 and
* netfilter). Important to keep this on a seperate cacheline.
* Its primarily a rebuild protection rwlock.
*/
rwlock_t lock ____cacheline_aligned_in_smp;
int secret_interval;
struct timer_list secret_timer;
u32 rnd;
int qsize;
unsigned int (*hashfn)(struct inet_frag_queue *);
bool (*match)(struct inet_frag_queue *q, void *arg);
void (*constructor)(struct inet_frag_queue *q,
void *arg);
void (*destructor)(struct inet_frag_queue *);
void (*skb_free)(struct sk_buff *);
void (*frag_expire)(unsigned long data);
};
void inet_frags_init(struct inet_frags *);
void inet_frags_fini(struct inet_frags *);
int inet_frags_init_net(struct netns_frags *nf);
void inet_frags_exit_net(struct netns_frags *nf, struct inet_frags *f);
void inet_frag_kill(struct inet_frag_queue *q, struct inet_frags *f);
void inet_frag_destroy(struct inet_frag_queue *q,
struct inet_frags *f, int *work);
int inet_frag_evictor(struct netns_frags *nf, struct inet_frags *f, bool force);
struct inet_frag_queue *inet_frag_find(struct netns_frags *nf,
struct inet_frags *f, void *key, unsigned int hash)
__releases(&f->lock);
/* 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, struct inet_frags *f)
{
if (atomic_dec_and_test(&q->refcnt))
inet_frag_destroy(q, f, NULL);
}
/* Memory Tracking Functions. */
static inline int frag_mem_limit(struct netns_frags *nf)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(nf);
return atomic_read(&nf_priv->mem);
}
static inline void sub_frag_mem_limit(struct inet_frag_queue *q, int i)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(q->net);
atomic_sub(i, &nf_priv->mem);
}
static inline void add_frag_mem_limit(struct inet_frag_queue *q, int i)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(q->net);
atomic_add(i, &nf_priv->mem);
}
static inline void init_frag_mem_limit(struct netns_frags *nf)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(nf);
atomic_set(&nf_priv->mem, 0);
}
static inline int sum_frag_mem_limit(struct netns_frags *nf)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(nf);
return atomic_read(&nf_priv->mem);
}
static inline void inet_frag_lru_move(struct inet_frag_queue *q)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(q->net);
spin_lock(&nf_priv->lru_lock);
if (!list_empty(&nf_priv->lru_list))
list_move_tail(&q->lru_list, &nf_priv->lru_list);
spin_unlock(&nf_priv->lru_lock);
}
static inline void inet_frag_lru_del(struct inet_frag_queue *q)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(q->net);
spin_lock(&nf_priv->lru_lock);
list_del_init(&q->lru_list);
nf_priv->nqueues--;
spin_unlock(&nf_priv->lru_lock);
}
static inline void inet_frag_lru_add(struct netns_frags *nf,
struct inet_frag_queue *q)
{
struct netns_frags_priv *nf_priv = netns_frags_priv(nf);
spin_lock(&nf_priv->lru_lock);
list_add_tail(&q->lru_list, &nf_priv->lru_list);
nf_priv->nqueues++;
spin_unlock(&nf_priv->lru_lock);
}
#endif
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