#define _REQUEST_SOCK_H
#include <linux/slab.h>
+#include <linux/spinlock.h>
#include <linux/types.h>
+#include <linux/bug.h>
+
#include <net/sock.h>
-struct open_request;
+struct request_sock;
struct sk_buff;
struct dst_entry;
struct proto;
-struct or_calltable {
+struct request_sock_ops {
int family;
- kmem_cache_t *slab;
int obj_size;
+ struct kmem_cache *slab;
+ char *slab_name;
int (*rtx_syn_ack)(struct sock *sk,
- struct open_request *req,
- struct dst_entry *dst);
- void (*send_ack)(struct sk_buff *skb,
- struct open_request *req);
- void (*send_reset)(struct sk_buff *skb);
- void (*destructor)(struct open_request *req);
+ struct request_sock *req);
+ void (*send_ack)(struct sock *sk, struct sk_buff *skb,
+ struct request_sock *req);
+ void (*send_reset)(struct sock *sk,
+ struct sk_buff *skb);
+ void (*destructor)(struct request_sock *req);
};
-/* struct open_request - mini sock to represent a connection request
+/* struct request_sock - mini sock to represent a connection request
*/
-struct open_request {
- struct open_request *dl_next; /* Must be first member! */
+struct request_sock {
+ struct request_sock *dl_next; /* Must be first member! */
u16 mss;
u8 retrans;
- u8 __pad;
+ u8 cookie_ts; /* syncookie: encode tcpopts in timestamp */
/* The following two fields can be easily recomputed I think -AK */
u32 window_clamp; /* window clamp at creation time */
u32 rcv_wnd; /* rcv_wnd offered first time */
u32 ts_recent;
unsigned long expires;
- struct or_calltable *class;
+ const struct request_sock_ops *rsk_ops;
struct sock *sk;
+ u32 secid;
+ u32 peer_secid;
};
-static inline struct open_request *tcp_openreq_alloc(struct or_calltable *class)
+static inline struct request_sock *reqsk_alloc(const struct request_sock_ops *ops)
{
- struct open_request *req = kmem_cache_alloc(class->slab, SLAB_ATOMIC);
+ struct request_sock *req = kmem_cache_alloc(ops->slab, GFP_ATOMIC);
if (req != NULL)
- req->class = class;
+ req->rsk_ops = ops;
return req;
}
-static inline void tcp_openreq_fastfree(struct open_request *req)
+static inline void __reqsk_free(struct request_sock *req)
{
- kmem_cache_free(req->class->slab, req);
+ kmem_cache_free(req->rsk_ops->slab, req);
+}
+
+static inline void reqsk_free(struct request_sock *req)
+{
+ req->rsk_ops->destructor(req);
+ __reqsk_free(req);
+}
+
+extern int sysctl_max_syn_backlog;
+
+/** struct listen_sock - listen state
+ *
+ * @max_qlen_log - log_2 of maximal queued SYNs/REQUESTs
+ */
+struct listen_sock {
+ u8 max_qlen_log;
+ /* 3 bytes hole, try to use */
+ int qlen;
+ int qlen_young;
+ int clock_hand;
+ u32 hash_rnd;
+ u32 nr_table_entries;
+ struct request_sock *syn_table[0];
+};
+
+/** struct request_sock_queue - queue of request_socks
+ *
+ * @rskq_accept_head - FIFO head of established children
+ * @rskq_accept_tail - FIFO tail of established children
+ * @rskq_defer_accept - User waits for some data after accept()
+ * @syn_wait_lock - serializer
+ *
+ * %syn_wait_lock is necessary only to avoid proc interface having to grab the main
+ * lock sock while browsing the listening hash (otherwise it's deadlock prone).
+ *
+ * This lock is acquired in read mode only from listening_get_next() seq_file
+ * op and it's acquired in write mode _only_ from code that is actively
+ * changing rskq_accept_head. All readers that are holding the master sock lock
+ * don't need to grab this lock in read mode too as rskq_accept_head. writes
+ * are always protected from the main sock lock.
+ */
+struct request_sock_queue {
+ struct request_sock *rskq_accept_head;
+ struct request_sock *rskq_accept_tail;
+ rwlock_t syn_wait_lock;
+ u8 rskq_defer_accept;
+ /* 3 bytes hole, try to pack */
+ struct listen_sock *listen_opt;
+};
+
+extern int reqsk_queue_alloc(struct request_sock_queue *queue,
+ unsigned int nr_table_entries);
+
+extern void __reqsk_queue_destroy(struct request_sock_queue *queue);
+extern void reqsk_queue_destroy(struct request_sock_queue *queue);
+
+static inline struct request_sock *
+ reqsk_queue_yank_acceptq(struct request_sock_queue *queue)
+{
+ struct request_sock *req = queue->rskq_accept_head;
+
+ queue->rskq_accept_head = NULL;
+ return req;
+}
+
+static inline int reqsk_queue_empty(struct request_sock_queue *queue)
+{
+ return queue->rskq_accept_head == NULL;
+}
+
+static inline void reqsk_queue_unlink(struct request_sock_queue *queue,
+ struct request_sock *req,
+ struct request_sock **prev_req)
+{
+ write_lock(&queue->syn_wait_lock);
+ *prev_req = req->dl_next;
+ write_unlock(&queue->syn_wait_lock);
+}
+
+static inline void reqsk_queue_add(struct request_sock_queue *queue,
+ struct request_sock *req,
+ struct sock *parent,
+ struct sock *child)
+{
+ req->sk = child;
+ sk_acceptq_added(parent);
+
+ if (queue->rskq_accept_head == NULL)
+ queue->rskq_accept_head = req;
+ else
+ queue->rskq_accept_tail->dl_next = req;
+
+ queue->rskq_accept_tail = req;
+ req->dl_next = NULL;
}
-static inline void tcp_openreq_free(struct open_request *req)
+static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue)
{
- req->class->destructor(req);
- tcp_openreq_fastfree(req);
+ struct request_sock *req = queue->rskq_accept_head;
+
+ WARN_ON(req == NULL);
+
+ queue->rskq_accept_head = req->dl_next;
+ if (queue->rskq_accept_head == NULL)
+ queue->rskq_accept_tail = NULL;
+
+ return req;
+}
+
+static inline struct sock *reqsk_queue_get_child(struct request_sock_queue *queue,
+ struct sock *parent)
+{
+ struct request_sock *req = reqsk_queue_remove(queue);
+ struct sock *child = req->sk;
+
+ WARN_ON(child == NULL);
+
+ sk_acceptq_removed(parent);
+ __reqsk_free(req);
+ return child;
+}
+
+static inline int reqsk_queue_removed(struct request_sock_queue *queue,
+ struct request_sock *req)
+{
+ struct listen_sock *lopt = queue->listen_opt;
+
+ if (req->retrans == 0)
+ --lopt->qlen_young;
+
+ return --lopt->qlen;
+}
+
+static inline int reqsk_queue_added(struct request_sock_queue *queue)
+{
+ struct listen_sock *lopt = queue->listen_opt;
+ const int prev_qlen = lopt->qlen;
+
+ lopt->qlen_young++;
+ lopt->qlen++;
+ return prev_qlen;
+}
+
+static inline int reqsk_queue_len(const struct request_sock_queue *queue)
+{
+ return queue->listen_opt != NULL ? queue->listen_opt->qlen : 0;
+}
+
+static inline int reqsk_queue_len_young(const struct request_sock_queue *queue)
+{
+ return queue->listen_opt->qlen_young;
+}
+
+static inline int reqsk_queue_is_full(const struct request_sock_queue *queue)
+{
+ return queue->listen_opt->qlen >> queue->listen_opt->max_qlen_log;
+}
+
+static inline void reqsk_queue_hash_req(struct request_sock_queue *queue,
+ u32 hash, struct request_sock *req,
+ unsigned long timeout)
+{
+ struct listen_sock *lopt = queue->listen_opt;
+
+ req->expires = jiffies + timeout;
+ req->retrans = 0;
+ req->sk = NULL;
+ req->dl_next = lopt->syn_table[hash];
+
+ write_lock(&queue->syn_wait_lock);
+ lopt->syn_table[hash] = req;
+ write_unlock(&queue->syn_wait_lock);
}
#endif /* _REQUEST_SOCK_H */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff