Commit f21e68ca authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
Browse files

[DCCP]: Prepare the AF agnostic core for the introduction of DCCPv6 



Basically exports a similar set of functions as the one exported by
the non-AF specific TCP code.

In the process moved some non-AF specific code from dccp_v4_connect to
dccp_connect_init and moved the checksum verification from
dccp_invalid_packet to dccp_v4_rcv, so as to use it in dccp_v6_rcv
too.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 34ca6860

net/dccp/dccp.h

+22 −0
Original line number Diff line number Diff line
@@ -228,6 +228,9 @@ extern int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb, 
extern int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,

				const struct dccp_hdr *dh, const unsigned len);



extern int dccp_v4_init_sock(struct sock *sk);

extern int dccp_v4_destroy_sock(struct sock *sk);



extern void		dccp_close(struct sock *sk, long timeout);

extern struct sk_buff	*dccp_make_response(struct sock *sk,

					    struct dst_entry *dst,
@@ -238,6 +241,7 @@ extern struct sk_buff *dccp_make_reset(struct sock *sk, 


extern int	   dccp_connect(struct sock *sk);

extern int	   dccp_disconnect(struct sock *sk, int flags);

extern void	   dccp_unhash(struct sock *sk);

extern int	   dccp_getsockopt(struct sock *sk, int level, int optname,

				   char __user *optval, int __user *optlen);

extern int	   dccp_setsockopt(struct sock *sk, int level, int optname,
@@ -249,6 +253,13 @@ extern int dccp_recvmsg(struct kiocb *iocb, struct sock *sk, 
				struct msghdr *msg, size_t len, int nonblock,

				int flags, int *addr_len);

extern void	   dccp_shutdown(struct sock *sk, int how);

extern int	   inet_dccp_listen(struct socket *sock, int backlog);

extern unsigned int dccp_poll(struct file *file, struct socket *sock,

			     poll_table *wait);

extern void	   dccp_v4_send_check(struct sock *sk, int len,

				      struct sk_buff *skb);

extern int	   dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,

				   int addr_len);



extern int	   dccp_v4_checksum(const struct sk_buff *skb,

				    const u32 saddr, const u32 daddr);
@@ -256,6 +267,17 @@ extern int dccp_v4_checksum(const struct sk_buff *skb, 
extern int	   dccp_v4_send_reset(struct sock *sk,

				      enum dccp_reset_codes code);

extern void	   dccp_send_close(struct sock *sk, const int active);

extern int	   dccp_invalid_packet(struct sk_buff *skb);



static inline int dccp_bad_service_code(const struct sock *sk,

					const __u32 service)

{

	const struct dccp_sock *dp = dccp_sk(sk);



	if (dp->dccps_service == service)

		return 0;

	return !dccp_list_has_service(dp->dccps_service_list, service);

}



struct dccp_skb_cb {

	__u8  dccpd_type:4;

net/dccp/input.c

+4 −0
Original line number Diff line number Diff line
@@ -250,6 +250,8 @@ discard: 
	return 0;

}



EXPORT_SYMBOL_GPL(dccp_rcv_established);



static int dccp_rcv_request_sent_state_process(struct sock *sk,

					       struct sk_buff *skb,

					       const struct dccp_hdr *dh,
@@ -567,3 +569,5 @@ discard: 
	}

	return 0;

}



EXPORT_SYMBOL_GPL(dccp_rcv_state_process);

net/dccp/ipv4.c

+34 −39
Original line number Diff line number Diff line
@@ -46,11 +46,13 @@ static void dccp_v4_hash(struct sock *sk) 
	inet_hash(&dccp_hashinfo, sk);

}



static void dccp_v4_unhash(struct sock *sk)

void dccp_unhash(struct sock *sk)

{

	inet_unhash(&dccp_hashinfo, sk);

}



EXPORT_SYMBOL_GPL(dccp_unhash);



/* called with local bh disabled */

static int __dccp_v4_check_established(struct sock *sk, const __u16 lport,

				      struct inet_timewait_sock **twp)
@@ -209,8 +211,7 @@ out: 
	}

}



static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr,

			   int addr_len)

int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)

{

	struct inet_sock *inet = inet_sk(sk);

	struct dccp_sock *dp = dccp_sk(sk);
@@ -288,16 +289,6 @@ static int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, 
							    usin->sin_port);

	dccp_update_gss(sk, dp->dccps_iss);



	/*

	 * SWL and AWL are initially adjusted so that they are not less than

	 * the initial Sequence Numbers received and sent, respectively:

	 *	SWL := max(GSR + 1 - floor(W/4), ISR),

	 *	AWL := max(GSS - W' + 1, ISS).

	 * These adjustments MUST be applied only at the beginning of the

	 * connection.

	 */

	dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));



	inet->id = dp->dccps_iss ^ jiffies;



	err = dccp_connect(sk);
@@ -317,6 +308,8 @@ failure: 
	goto out;

}



EXPORT_SYMBOL_GPL(dccp_v4_connect);



/*

 * This routine does path mtu discovery as defined in RFC1191.

 */
@@ -608,7 +601,7 @@ out: 
}



/* This routine computes an IPv4 DCCP checksum. */

static void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)

void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)

{

	const struct inet_sock *inet = inet_sk(sk);

	struct dccp_hdr *dh = dccp_hdr(skb);
@@ -616,6 +609,8 @@ static void dccp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb) 
	dh->dccph_checksum = dccp_v4_checksum(skb, inet->saddr, inet->daddr);

}



EXPORT_SYMBOL_GPL(dccp_v4_send_check);



int dccp_v4_send_reset(struct sock *sk, enum dccp_reset_codes code)

{

	struct sk_buff *skb;
@@ -651,16 +646,6 @@ static inline u64 dccp_v4_init_sequence(const struct sock *sk, 
					   dccp_hdr(skb)->dccph_sport);

}



static inline int dccp_bad_service_code(const struct sock *sk,

					const __u32 service)

{

	const struct dccp_sock *dp = dccp_sk(sk);



	if (dp->dccps_service == service)

		return 0;

	return !dccp_list_has_service(dp->dccps_service_list, service);

}



int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb)

{

	struct inet_request_sock *ireq;
@@ -672,7 +657,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) 
 	const __u32 service = dccp_hdr_request(skb)->dccph_req_service;

	struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);

	__u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;

	struct dst_entry *dst = NULL;



	/* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */

	if (((struct rtable *)skb->dst)->rt_flags &
@@ -713,7 +697,6 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) 
	ireq = inet_rsk(req);

	ireq->loc_addr = daddr;

	ireq->rmt_addr = saddr;

	/* FIXME: Merge Aristeu's option parsing code when ready */

	req->rcv_wnd	= 100; /* Fake, option parsing will get the

				  right value */

	ireq->opt	= NULL;
@@ -731,7 +714,7 @@ int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) 
	dreq->dreq_iss	   = dccp_v4_init_sequence(sk, skb);

	dreq->dreq_service = service;



	if (dccp_v4_send_response(sk, req, dst))

	if (dccp_v4_send_response(sk, req, NULL))

		goto drop_and_free;



	inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
@@ -748,6 +731,8 @@ drop: 
	return -1;

}



EXPORT_SYMBOL_GPL(dccp_v4_conn_request);



/*

 * The three way handshake has completed - we got a valid ACK or DATAACK -

 * now create the new socket.
@@ -802,6 +787,8 @@ exit: 
	return NULL;

}



EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock);



static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)

{

	const struct dccp_hdr *dh = dccp_hdr(skb);
@@ -1021,7 +1008,9 @@ discard: 
	return 0;

}



static inline int dccp_invalid_packet(struct sk_buff *skb)

EXPORT_SYMBOL_GPL(dccp_v4_do_rcv);



int dccp_invalid_packet(struct sk_buff *skb)

{

	const struct dccp_hdr *dh;
@@ -1075,17 +1064,11 @@ static inline int dccp_invalid_packet(struct sk_buff *skb) 
		return 1;

	}



	/* If the header checksum is incorrect, drop packet and return */

	if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr,

				    skb->nh.iph->daddr) < 0) {

		LIMIT_NETDEBUG(KERN_WARNING "DCCP: header checksum is "

					    "incorrect\n");

		return 1;

	}



	return 0;

}



EXPORT_SYMBOL_GPL(dccp_invalid_packet);



/* this is called when real data arrives */

int dccp_v4_rcv(struct sk_buff *skb)

{
@@ -1098,6 +1081,14 @@ int dccp_v4_rcv(struct sk_buff *skb) 
	if (dccp_invalid_packet(skb))

		goto discard_it;



	/* If the header checksum is incorrect, drop packet and return */

	if (dccp_v4_verify_checksum(skb, skb->nh.iph->saddr,

				    skb->nh.iph->daddr) < 0) {

		LIMIT_NETDEBUG(KERN_WARNING "%s: incorrect header checksum\n",

			       __FUNCTION__);

		goto discard_it;

	}



	dh = dccp_hdr(skb);



	DCCP_SKB_CB(skb)->dccpd_seq  = dccp_hdr_seq(skb);
@@ -1217,7 +1208,7 @@ struct inet_connection_sock_af_ops dccp_ipv4_af_ops = { 
	.sockaddr_len	= sizeof(struct sockaddr_in),

};



static int dccp_v4_init_sock(struct sock *sk)

int dccp_v4_init_sock(struct sock *sk)

{

	struct dccp_sock *dp = dccp_sk(sk);

	static int dccp_ctl_socket_init = 1;
@@ -1270,7 +1261,9 @@ static int dccp_v4_init_sock(struct sock *sk) 
	return 0;

}



static int dccp_v4_destroy_sock(struct sock *sk)

EXPORT_SYMBOL_GPL(dccp_v4_init_sock);



int dccp_v4_destroy_sock(struct sock *sk)

{

	struct dccp_sock *dp = dccp_sk(sk);
@@ -1303,6 +1296,8 @@ static int dccp_v4_destroy_sock(struct sock *sk) 
	return 0;

}



EXPORT_SYMBOL_GPL(dccp_v4_destroy_sock);



static void dccp_v4_reqsk_destructor(struct request_sock *req)

{

	kfree(inet_rsk(req)->opt);
@@ -1331,7 +1326,7 @@ struct proto dccp_prot = { 
	.recvmsg		= dccp_recvmsg,

	.backlog_rcv		= dccp_v4_do_rcv,

	.hash			= dccp_v4_hash,

	.unhash			= dccp_v4_unhash,

	.unhash			= dccp_unhash,

	.accept			= inet_csk_accept,

	.get_port		= dccp_v4_get_port,

	.shutdown		= dccp_shutdown,

net/dccp/minisocks.c

+8 −0
Original line number Diff line number Diff line
@@ -40,6 +40,8 @@ struct inet_timewait_death_row dccp_death_row = { 
					    (unsigned long)&dccp_death_row),

};



EXPORT_SYMBOL_GPL(dccp_death_row);



void dccp_time_wait(struct sock *sk, int state, int timeo)

{

	struct inet_timewait_sock *tw = NULL;
@@ -170,6 +172,8 @@ out_free: 
	return newsk;

}



EXPORT_SYMBOL_GPL(dccp_create_openreq_child);



/* 

 * Process an incoming packet for RESPOND sockets represented

 * as an request_sock.
@@ -236,6 +240,8 @@ drop: 
	goto out;

}



EXPORT_SYMBOL_GPL(dccp_check_req);



/*

 *  Queue segment on the new socket if the new socket is active,

 *  otherwise we just shortcircuit this and continue with
@@ -266,3 +272,5 @@ int dccp_child_process(struct sock *parent, struct sock *child, 
	sock_put(child);

	return ret;

}



EXPORT_SYMBOL_GPL(dccp_child_process);

net/dccp/output.c

+17 −10
Original line number Diff line number Diff line
@@ -135,12 +135,6 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb) 
unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu)

{

	struct dccp_sock *dp = dccp_sk(sk);

	/*

	 * FIXME: we really should be using the af_specific thing to support

	 * 	  IPv6.

	 * mss_now = pmtu - tp->af_specific->net_header_len -

	 * 	     sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext);

	 */

	int mss_now = (pmtu - inet_csk(sk)->icsk_af_ops->net_header_len -

		       sizeof(struct dccp_hdr) - sizeof(struct dccp_hdr_ext));
@@ -164,6 +158,8 @@ unsigned int dccp_sync_mss(struct sock *sk, u32 pmtu) 
	return mss_now;

}



EXPORT_SYMBOL_GPL(dccp_sync_mss);



void dccp_write_space(struct sock *sk)

{

	read_lock(&sk->sk_callback_lock);
@@ -319,6 +315,8 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst, 
	return skb;

}



EXPORT_SYMBOL_GPL(dccp_make_response);



struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,

				const enum dccp_reset_codes code)
@@ -375,6 +373,7 @@ struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst, 
 */

static inline void dccp_connect_init(struct sock *sk)

{

	struct dccp_sock *dp = dccp_sk(sk);

	struct dst_entry *dst = __sk_dst_get(sk);

	struct inet_connection_sock *icsk = inet_csk(sk);
@@ -383,10 +382,16 @@ static inline void dccp_connect_init(struct sock *sk) 
	

	dccp_sync_mss(sk, dst_mtu(dst));



	dccp_update_gss(sk, dp->dccps_iss);

 	/*

	 * FIXME: set dp->{dccps_swh,dccps_swl}, with

	 * something like dccp_inc_seq

	 * SWL and AWL are initially adjusted so that they are not less than

	 * the initial Sequence Numbers received and sent, respectively:

	 *	SWL := max(GSR + 1 - floor(W/4), ISR),

	 *	AWL := max(GSS - W' + 1, ISS).

	 * These adjustments MUST be applied only at the beginning of the

	 * connection.

 	 */

	dccp_set_seqno(&dp->dccps_awl, max48(dp->dccps_awl, dp->dccps_iss));



	icsk->icsk_retransmits = 0;

}
@@ -418,6 +423,8 @@ int dccp_connect(struct sock *sk) 
	return 0;

}



EXPORT_SYMBOL_GPL(dccp_connect);



void dccp_send_ack(struct sock *sk)

{

	/* If we have been reset, we may not send again. */

CRA Git | Maintained and supported by SUSTech CRA and CCSE