diff options
Diffstat (limited to 'include/net/inet_frag.h')
| -rw-r--r-- | include/net/inet_frag.h | 74 |
1 files changed, 50 insertions, 24 deletions
diff --git a/include/net/inet_frag.h b/include/net/inet_frag.h index b02bf737d019..0eccd9c3a883 100644 --- a/include/net/inet_frag.h +++ b/include/net/inet_frag.h @@ -3,32 +3,46 @@ #define __NET_FRAG_H__ #include <linux/rhashtable-types.h> - -struct netns_frags { +#include <linux/completion.h> +#include <linux/in6.h> +#include <linux/rbtree_types.h> +#include <linux/refcount.h> +#include <net/dropreason-core.h> + +/* Per netns frag queues directory */ +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; }; /** - * fragment queue flags + * 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 { @@ -56,16 +70,16 @@ struct frag_v6_compare_key { * @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 + * @tstamp_type: stamp has a mono delivery time (EDT) * @flags: fragment queue flags * @max_size: maximum received fragment size - * @net: namespace that this frag belongs to + * @fqdir: pointer to struct fqdir * @rcu: rcu head for freeing deferall */ struct inet_frag_queue { @@ -77,16 +91,16 @@ struct inet_frag_queue { struct timer_list timer; spinlock_t lock; refcount_t refcnt; - struct sk_buff *fragments; /* used in 6lopwpan IPv6. */ - struct rb_root rb_fragments; /* Used in IPv4/IPv6. */ + 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; - struct netns_frags *net; + struct fqdir *fqdir; struct rcu_head rcu; }; @@ -100,46 +114,58 @@ struct inet_frags { struct kmem_cache *frags_cachep; const char *frags_cache_name; struct rhashtable_params rhash_params; + refcount_t refcnt; + struct completion completion; }; 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) +int fqdir_init(struct fqdir **fqdirp, struct inet_frags *f, struct net *net); + +static inline void fqdir_pre_exit(struct fqdir *fqdir) { - atomic_long_set(&nf->mem, 0); - return rhashtable_init(&nf->rhashtable, &nf->f->rhash_params); + /* Prevent creation of new frags. + * Pairs with READ_ONCE() in inet_frag_find(). + */ + WRITE_ONCE(fqdir->high_thresh, 0); + + /* Pairs with READ_ONCE() in inet_frag_kill(), ip_expire() + * and ip6frag_expire_frag_queue(). + */ + WRITE_ONCE(fqdir->dead, true); } -void inet_frags_exit_net(struct netns_frags *nf); +void fqdir_exit(struct fqdir *fqdir); -void inet_frag_kill(struct inet_frag_queue *q); +void inet_frag_kill(struct inet_frag_queue *q, int *refs); void inet_frag_destroy(struct inet_frag_queue *q); -struct inet_frag_queue *inet_frag_find(struct netns_frags *nf, void *key); +struct inet_frag_queue *inet_frag_find(struct fqdir *fqdir, void *key); /* Free all skbs in the queue; return the sum of their truesizes. */ -unsigned int inet_frag_rbtree_purge(struct rb_root *root); +unsigned int inet_frag_rbtree_purge(struct rb_root *root, + enum skb_drop_reason reason); -static inline void inet_frag_put(struct inet_frag_queue *q) +static inline void inet_frag_putn(struct inet_frag_queue *q, int refs) { - if (refcount_dec_and_test(&q->refcnt)) + if (refs && refcount_sub_and_test(refs, &q->refcnt)) inet_frag_destroy(q); } /* Memory Tracking Functions. */ -static inline long frag_mem_limit(const struct netns_frags *nf) +static inline long frag_mem_limit(const struct fqdir *fqdir) { - return atomic_long_read(&nf->mem); + return atomic_long_read(&fqdir->mem); } -static inline void sub_frag_mem_limit(struct netns_frags *nf, long val) +static inline void sub_frag_mem_limit(struct fqdir *fqdir, long val) { - atomic_long_sub(val, &nf->mem); + atomic_long_sub(val, &fqdir->mem); } -static inline void add_frag_mem_limit(struct netns_frags *nf, long val) +static inline void add_frag_mem_limit(struct fqdir *fqdir, long val) { - atomic_long_add(val, &nf->mem); + atomic_long_add(val, &fqdir->mem); } /* RFC 3168 support : @@ -162,7 +188,7 @@ int inet_frag_queue_insert(struct inet_frag_queue *q, struct sk_buff *skb, void *inet_frag_reasm_prepare(struct inet_frag_queue *q, struct sk_buff *skb, struct sk_buff *parent); void inet_frag_reasm_finish(struct inet_frag_queue *q, struct sk_buff *head, - void *reasm_data); + void *reasm_data, bool try_coalesce); struct sk_buff *inet_frag_pull_head(struct inet_frag_queue *q); #endif |