Initial import

1 files changed, 330 insertions, 0 deletions

diff --git a/include/net/inet_connection_sock.h b/include/net/inet_connection_sock.h
new file mode 100644
index 000000000..0320bbb7d
--- /dev/null
+++ b/include/net/inet_connection_sock.h
@@ -0,0 +1,330 @@
+/*
+ * NET		Generic infrastructure for INET connection oriented protocols.
+ *
+ *		Definitions for inet_connection_sock 
+ *
+ * Authors:	Many people, see the TCP sources
+ *
+ * 		From code originally in TCP
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ */
+#ifndef _INET_CONNECTION_SOCK_H
+#define _INET_CONNECTION_SOCK_H
+
+#include <linux/compiler.h>
+#include <linux/string.h>
+#include <linux/timer.h>
+#include <linux/poll.h>
+
+#include <net/inet_sock.h>
+#include <net/request_sock.h>
+
+#define INET_CSK_DEBUG 1
+
+/* Cancel timers, when they are not required. */
+#undef INET_CSK_CLEAR_TIMERS
+
+struct inet_bind_bucket;
+struct tcp_congestion_ops;
+
+/*
+ * Pointers to address related TCP functions
+ * (i.e. things that depend on the address family)
+ */
+struct inet_connection_sock_af_ops {
+	int	    (*queue_xmit)(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
+	void	    (*send_check)(struct sock *sk, struct sk_buff *skb);
+	int	    (*rebuild_header)(struct sock *sk);
+	void	    (*sk_rx_dst_set)(struct sock *sk, const struct sk_buff *skb);
+	int	    (*conn_request)(struct sock *sk, struct sk_buff *skb);
+	struct sock *(*syn_recv_sock)(struct sock *sk, struct sk_buff *skb,
+				      struct request_sock *req,
+				      struct dst_entry *dst);
+	u16	    net_header_len;
+	u16	    net_frag_header_len;
+	u16	    sockaddr_len;
+	int	    (*setsockopt)(struct sock *sk, int level, int optname, 
+				  char __user *optval, unsigned int optlen);
+	int	    (*getsockopt)(struct sock *sk, int level, int optname, 
+				  char __user *optval, int __user *optlen);
+#ifdef CONFIG_COMPAT
+	int	    (*compat_setsockopt)(struct sock *sk,
+				int level, int optname,
+				char __user *optval, unsigned int optlen);
+	int	    (*compat_getsockopt)(struct sock *sk,
+				int level, int optname,
+				char __user *optval, int __user *optlen);
+#endif
+	void	    (*addr2sockaddr)(struct sock *sk, struct sockaddr *);
+	int	    (*bind_conflict)(const struct sock *sk,
+				     const struct inet_bind_bucket *tb, bool relax);
+	void	    (*mtu_reduced)(struct sock *sk);
+};
+
+/** inet_connection_sock - INET connection oriented sock
+ *
+ * @icsk_accept_queue:	   FIFO of established children 
+ * @icsk_bind_hash:	   Bind node
+ * @icsk_timeout:	   Timeout
+ * @icsk_retransmit_timer: Resend (no ack)
+ * @icsk_rto:		   Retransmit timeout
+ * @icsk_pmtu_cookie	   Last pmtu seen by socket
+ * @icsk_ca_ops		   Pluggable congestion control hook
+ * @icsk_af_ops		   Operations which are AF_INET{4,6} specific
+ * @icsk_ca_state:	   Congestion control state
+ * @icsk_retransmits:	   Number of unrecovered [RTO] timeouts
+ * @icsk_pending:	   Scheduled timer event
+ * @icsk_backoff:	   Backoff
+ * @icsk_syn_retries:      Number of allowed SYN (or equivalent) retries
+ * @icsk_probes_out:	   unanswered 0 window probes
+ * @icsk_ext_hdr_len:	   Network protocol overhead (IP/IPv6 options)
+ * @icsk_ack:		   Delayed ACK control data
+ * @icsk_mtup;		   MTU probing control data
+ */
+struct inet_connection_sock {
+	/* inet_sock has to be the first member! */
+	struct inet_sock	  icsk_inet;
+	struct request_sock_queue icsk_accept_queue;
+	struct inet_bind_bucket	  *icsk_bind_hash;
+	unsigned long		  icsk_timeout;
+ 	struct timer_list	  icsk_retransmit_timer;
+ 	struct timer_list	  icsk_delack_timer;
+	__u32			  icsk_rto;
+	__u32			  icsk_pmtu_cookie;
+	const struct tcp_congestion_ops *icsk_ca_ops;
+	const struct inet_connection_sock_af_ops *icsk_af_ops;
+	unsigned int		  (*icsk_sync_mss)(struct sock *sk, u32 pmtu);
+	__u8			  icsk_ca_state:6,
+				  icsk_ca_setsockopt:1,
+				  icsk_ca_dst_locked:1;
+	__u8			  icsk_retransmits;
+	__u8			  icsk_pending;
+	__u8			  icsk_backoff;
+	__u8			  icsk_syn_retries;
+	__u8			  icsk_probes_out;
+	__u16			  icsk_ext_hdr_len;
+	struct {
+		__u8		  pending;	 /* ACK is pending			   */
+		__u8		  quick;	 /* Scheduled number of quick acks	   */
+		__u8		  pingpong;	 /* The session is interactive		   */
+		__u8		  blocked;	 /* Delayed ACK was blocked by socket lock */
+		__u32		  ato;		 /* Predicted tick of soft clock	   */
+		unsigned long	  timeout;	 /* Currently scheduled timeout		   */
+		__u32		  lrcvtime;	 /* timestamp of last received data packet */
+		__u16		  last_seg_size; /* Size of last incoming segment	   */
+		__u16		  rcv_mss;	 /* MSS used for delayed ACK decisions	   */ 
+	} icsk_ack;
+	struct {
+		int		  enabled;
+
+		/* Range of MTUs to search */
+		int		  search_high;
+		int		  search_low;
+
+		/* Information on the current probe. */
+		int		  probe_size;
+
+		u32		  probe_timestamp;
+	} icsk_mtup;
+	u32			  icsk_user_timeout;
+
+	u64			  icsk_ca_priv[64 / sizeof(u64)];
+#define ICSK_CA_PRIV_SIZE      (8 * sizeof(u64))
+};
+
+#define ICSK_TIME_RETRANS	1	/* Retransmit timer */
+#define ICSK_TIME_DACK		2	/* Delayed ack timer */
+#define ICSK_TIME_PROBE0	3	/* Zero window probe timer */
+#define ICSK_TIME_EARLY_RETRANS 4	/* Early retransmit timer */
+#define ICSK_TIME_LOSS_PROBE	5	/* Tail loss probe timer */
+
+static inline struct inet_connection_sock *inet_csk(const struct sock *sk)
+{
+	return (struct inet_connection_sock *)sk;
+}
+
+static inline void *inet_csk_ca(const struct sock *sk)
+{
+	return (void *)inet_csk(sk)->icsk_ca_priv;
+}
+
+struct sock *inet_csk_clone_lock(const struct sock *sk,
+				 const struct request_sock *req,
+				 const gfp_t priority);
+
+enum inet_csk_ack_state_t {
+	ICSK_ACK_SCHED	= 1,
+	ICSK_ACK_TIMER  = 2,
+	ICSK_ACK_PUSHED = 4,
+	ICSK_ACK_PUSHED2 = 8
+};
+
+void inet_csk_init_xmit_timers(struct sock *sk,
+			       void (*retransmit_handler)(unsigned long),
+			       void (*delack_handler)(unsigned long),
+			       void (*keepalive_handler)(unsigned long));
+void inet_csk_clear_xmit_timers(struct sock *sk);
+
+static inline void inet_csk_schedule_ack(struct sock *sk)
+{
+	inet_csk(sk)->icsk_ack.pending |= ICSK_ACK_SCHED;
+}
+
+static inline int inet_csk_ack_scheduled(const struct sock *sk)
+{
+	return inet_csk(sk)->icsk_ack.pending & ICSK_ACK_SCHED;
+}
+
+static inline void inet_csk_delack_init(struct sock *sk)
+{
+	memset(&inet_csk(sk)->icsk_ack, 0, sizeof(inet_csk(sk)->icsk_ack));
+}
+
+void inet_csk_delete_keepalive_timer(struct sock *sk);
+void inet_csk_reset_keepalive_timer(struct sock *sk, unsigned long timeout);
+
+#ifdef INET_CSK_DEBUG
+extern const char inet_csk_timer_bug_msg[];
+#endif
+
+static inline void inet_csk_clear_xmit_timer(struct sock *sk, const int what)
+{
+	struct inet_connection_sock *icsk = inet_csk(sk);
+	
+	if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0) {
+		icsk->icsk_pending = 0;
+#ifdef INET_CSK_CLEAR_TIMERS
+		sk_stop_timer(sk, &icsk->icsk_retransmit_timer);
+#endif
+	} else if (what == ICSK_TIME_DACK) {
+		icsk->icsk_ack.blocked = icsk->icsk_ack.pending = 0;
+#ifdef INET_CSK_CLEAR_TIMERS
+		sk_stop_timer(sk, &icsk->icsk_delack_timer);
+#endif
+	}
+#ifdef INET_CSK_DEBUG
+	else {
+		pr_debug("%s", inet_csk_timer_bug_msg);
+	}
+#endif
+}
+
+/*
+ *	Reset the retransmission timer
+ */
+static inline void inet_csk_reset_xmit_timer(struct sock *sk, const int what,
+					     unsigned long when,
+					     const unsigned long max_when)
+{
+	struct inet_connection_sock *icsk = inet_csk(sk);
+
+	if (when > max_when) {
+#ifdef INET_CSK_DEBUG
+		pr_debug("reset_xmit_timer: sk=%p %d when=0x%lx, caller=%p\n",
+			 sk, what, when, current_text_addr());
+#endif
+		when = max_when;
+	}
+
+	if (what == ICSK_TIME_RETRANS || what == ICSK_TIME_PROBE0 ||
+	    what == ICSK_TIME_EARLY_RETRANS || what ==  ICSK_TIME_LOSS_PROBE) {
+		icsk->icsk_pending = what;
+		icsk->icsk_timeout = jiffies + when;
+		sk_reset_timer(sk, &icsk->icsk_retransmit_timer, icsk->icsk_timeout);
+	} else if (what == ICSK_TIME_DACK) {
+		icsk->icsk_ack.pending |= ICSK_ACK_TIMER;
+		icsk->icsk_ack.timeout = jiffies + when;
+		sk_reset_timer(sk, &icsk->icsk_delack_timer, icsk->icsk_ack.timeout);
+	}
+#ifdef INET_CSK_DEBUG
+	else {
+		pr_debug("%s", inet_csk_timer_bug_msg);
+	}
+#endif
+}
+
+static inline unsigned long
+inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
+		     unsigned long max_when)
+{
+        u64 when = (u64)icsk->icsk_rto << icsk->icsk_backoff;
+
+        return (unsigned long)min_t(u64, when, max_when);
+}
+
+struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
+
+struct request_sock *inet_csk_search_req(struct sock *sk,
+					 const __be16 rport,
+					 const __be32 raddr,
+					 const __be32 laddr);
+int inet_csk_bind_conflict(const struct sock *sk,
+			   const struct inet_bind_bucket *tb, bool relax);
+int inet_csk_get_port(struct sock *sk, unsigned short snum);
+
+struct dst_entry *inet_csk_route_req(struct sock *sk, struct flowi4 *fl4,
+				     const struct request_sock *req);
+struct dst_entry *inet_csk_route_child_sock(struct sock *sk, struct sock *newsk,
+					    const struct request_sock *req);
+
+static inline void inet_csk_reqsk_queue_add(struct sock *sk,
+					    struct request_sock *req,
+					    struct sock *child)
+{
+	reqsk_queue_add(&inet_csk(sk)->icsk_accept_queue, req, sk, child);
+}
+
+void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
+				   unsigned long timeout);
+
+static inline void inet_csk_reqsk_queue_added(struct sock *sk,
+					      const unsigned long timeout)
+{
+	reqsk_queue_added(&inet_csk(sk)->icsk_accept_queue);
+}
+
+static inline int inet_csk_reqsk_queue_len(const struct sock *sk)
+{
+	return reqsk_queue_len(&inet_csk(sk)->icsk_accept_queue);
+}
+
+static inline int inet_csk_reqsk_queue_young(const struct sock *sk)
+{
+	return reqsk_queue_len_young(&inet_csk(sk)->icsk_accept_queue);
+}
+
+static inline int inet_csk_reqsk_queue_is_full(const struct sock *sk)
+{
+	return reqsk_queue_is_full(&inet_csk(sk)->icsk_accept_queue);
+}
+
+void inet_csk_reqsk_queue_drop(struct sock *sk, struct request_sock *req);
+
+void inet_csk_destroy_sock(struct sock *sk);
+void inet_csk_prepare_forced_close(struct sock *sk);
+
+/*
+ * LISTEN is a special case for poll..
+ */
+static inline unsigned int inet_csk_listen_poll(const struct sock *sk)
+{
+	return !reqsk_queue_empty(&inet_csk(sk)->icsk_accept_queue) ?
+			(POLLIN | POLLRDNORM) : 0;
+}
+
+int inet_csk_listen_start(struct sock *sk, const int nr_table_entries);
+void inet_csk_listen_stop(struct sock *sk);
+
+void inet_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr);
+
+int inet_csk_compat_getsockopt(struct sock *sk, int level, int optname,
+			       char __user *optval, int __user *optlen);
+int inet_csk_compat_setsockopt(struct sock *sk, int level, int optname,
+			       char __user *optval, unsigned int optlen);
+
+struct dst_entry *inet_csk_update_pmtu(struct sock *sk, u32 mtu);
+#endif /* _INET_CONNECTION_SOCK_H */