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Commit 725ba8ee authored by Arnaldo Carvalho de Melo's avatar Arnaldo Carvalho de Melo Committed by David S. Miller
Browse files

[DCCP]: Introduce the DCCP Kernel hacking menu 



Only available if CONFIG_DEBUG_KERNEL is enabled in the "Kernel
Hacking" Menu.

Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@mandriva.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 531669a0

net/dccp/Kconfig

+21 −0
Original line number Diff line number Diff line
@@ -26,4 +26,25 @@ config INET_DCCP_DIAG 


source "net/dccp/ccids/Kconfig"



menu "DCCP Kernel Hacking"

	depends on IP_DCCP=m && DEBUG_KERNEL=y



config IP_DCCP_DEBUG

	bool "DCCP debug messages"

	---help---

	  Only use this if you're hacking DCCP.



	  Just say N.



config IP_DCCP_UNLOAD_HACK

	depends on IP_DCCP_CCID3=m

	bool "DCCP control sock unload hack"

	---help---

	  Enable this to be able to unload the dccp module when the it

	  has only one refcount held, the control sock one. Just execute

	  "rmmod dccp_ccid3 dccp"



	  Just say N.

endmenu



endmenu

net/dccp/ccids/ccid3.c

+9 −0
Original line number Diff line number Diff line
@@ -2078,6 +2078,15 @@ module_init(ccid3_module_init); 


static __exit void ccid3_module_exit(void)

{

#ifdef CONFIG_IP_DCCP_UNLOAD_HACK

	/*

	 * Hack to use while developing, so that we get rid of the control

	 * sock, that is what keeps a refcount on dccp.ko -acme

	 */

	extern void dccp_ctl_sock_exit(void);



	dccp_ctl_sock_exit();

#endif

	ccid_unregister(&ccid3);



	if (ccid3_tx_hist != NULL) {

net/dccp/dccp.h

+3 −4
Original line number Diff line number Diff line
@@ -11,14 +11,13 @@ 
 *	published by the Free Software Foundation.

 */



#include <linux/config.h>

#include <linux/dccp.h>

#include <net/snmp.h>

#include <net/sock.h>

#include <net/tcp.h>



#define DCCP_DEBUG



#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

extern int dccp_debug;



#define dccp_pr_debug(format, a...) \
@@ -426,7 +425,7 @@ extern int dccp_ackpkts_add(struct dccp_ackpkts *ap, u64 ackno, u8 state); 
extern void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap,

					 struct sock *sk, u64 ackno);



#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

extern void dccp_ackvector_print(const u64 ackno,

				 const unsigned char *vector, int len);

extern void dccp_ackpkts_print(const struct dccp_ackpkts *ap);

net/dccp/options.c

+9 −9
Original line number Diff line number Diff line
@@ -58,7 +58,7 @@ static u32 dccp_decode_value_var(const unsigned char *bf, const u8 len) 
int dccp_parse_options(struct sock *sk, struct sk_buff *skb)

{

	struct dccp_sock *dp = dccp_sk(sk);

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

	const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?

					"CLIENT rx opt: " : "server rx opt: ";

#endif
@@ -303,7 +303,7 @@ void dccp_insert_option_elapsed_time(struct sock *sk, 
				     struct sk_buff *skb,

				     u32 elapsed_time)

{

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

	struct dccp_sock *dp = dccp_sk(sk);

	const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?

					"CLIENT TX opt: " : "server TX opt: ";
@@ -341,7 +341,7 @@ EXPORT_SYMBOL(dccp_insert_option_elapsed_time); 
static void dccp_insert_option_ack_vector(struct sock *sk, struct sk_buff *skb)

{

	struct dccp_sock *dp = dccp_sk(sk);

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

	const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?

					"CLIENT TX opt: " : "server TX opt: ";

#endif
@@ -425,7 +425,7 @@ static void dccp_insert_option_timestamp_echo(struct sock *sk, 
					      struct sk_buff *skb)

{

	struct dccp_sock *dp = dccp_sk(sk);

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

	const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?

					"CLIENT TX opt: " : "server TX opt: ";

#endif
@@ -504,7 +504,7 @@ struct dccp_ackpkts *dccp_ackpkts_alloc(unsigned int len, int priority) 
	struct dccp_ackpkts *ap = kmalloc(sizeof(*ap) + len, priority);



	if (ap != NULL) {

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

		memset(ap->dccpap_buf, 0xFF, len);

#endif

		ap->dccpap_buf_len   = len;
@@ -526,7 +526,7 @@ struct dccp_ackpkts *dccp_ackpkts_alloc(unsigned int len, int priority) 
void dccp_ackpkts_free(struct dccp_ackpkts *ap)

{

	if (ap != NULL) {

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

		memset(ap, 0xFF, sizeof(*ap) + ap->dccpap_buf_len);

#endif

		kfree(ap);
@@ -680,7 +680,7 @@ out_duplicate: 
	return -EILSEQ;

}



#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

void dccp_ackvector_print(const u64 ackno, const unsigned char *vector,

			  int len)

{
@@ -735,7 +735,7 @@ void dccp_ackpkts_check_rcv_ackno(struct dccp_ackpkts *ap, struct sock *sk, 
		return;



	if (ackno == ap->dccpap_ack_seqno) {

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

		struct dccp_sock *dp = dccp_sk(sk);

		const char *debug_prefix = dp->dccps_role == DCCP_ROLE_CLIENT ?

					"CLIENT rx ack: " : "server rx ack: ";
@@ -794,7 +794,7 @@ static void dccp_ackpkts_check_rcv_ackvector(struct dccp_ackpkts *ap, 
			/* dccp_pr_debug_cat("yes\n"); */



			if (state != DCCP_ACKPKTS_STATE_NOT_RECEIVED) {

#ifdef DCCP_DEBUG

#ifdef CONFIG_IP_DCCP_DEBUG

				struct dccp_sock *dp = dccp_sk(sk);

				const char *debug_prefix =

					dp->dccps_role == DCCP_ROLE_CLIENT ?

net/dccp/proto.c

+14 −8
Original line number Diff line number Diff line
@@ -503,12 +503,16 @@ static int __init dccp_ctl_sock_init(void) 
	return rc;

}



static void __exit dccp_ctl_sock_exit(void)

#ifdef CONFIG_IP_DCCP_UNLOAD_HACK

void dccp_ctl_sock_exit(void)

{

	if (dccp_ctl_socket != NULL)

		sock_release(dccp_ctl_socket);

}



EXPORT_SYMBOL_GPL(dccp_ctl_sock_exit);

#endif



static int __init init_dccp_v4_mibs(void)

{

	int rc = -ENOMEM;
@@ -655,19 +659,21 @@ static const char dccp_del_proto_err_msg[] __exitdata = 


static void __exit dccp_fini(void)

{

	dccp_ctl_sock_exit();



	inet_unregister_protosw(&dccp_v4_protosw);



	if (inet_del_protocol(&dccp_protocol, IPPROTO_DCCP) < 0)

		printk(dccp_del_proto_err_msg);



	/* Free the control endpoint.  */

	sock_release(dccp_ctl_socket);



	proto_unregister(&dccp_v4_prot);



	free_percpu(dccp_statistics[0]);

	free_percpu(dccp_statistics[1]);

	free_pages((unsigned long)dccp_hashinfo.bhash,

		   get_order(dccp_hashinfo.bhash_size *

			     sizeof(struct inet_bind_hashbucket)));

	free_pages((unsigned long)dccp_hashinfo.ehash,

		   get_order(dccp_hashinfo.ehash_size *

			     sizeof(struct inet_ehash_bucket)));

	kmem_cache_destroy(dccp_hashinfo.bind_bucket_cachep);

	proto_unregister(&dccp_v4_prot);

}



module_init(dccp_init);