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Commit d750dbdc authored by Tina Ruchandani's avatar Tina Ruchandani Committed by David S. Miller
Browse files

atm: mpoa: remove 32-bit timekeeping 



net/atm/mpoa_* files use 'struct timeval' to store event
timestamps. struct timeval uses a 32-bit seconds field which will
overflow in the year 2038 and beyond. Morever, the timestamps are being
compared only to get seconds elapsed, so struct timeval which stores
a seconds and microseconds field is an overkill. This patch replaces
the use of struct timeval with time64_t to store a 64-bit seconds field.

Signed-off-by: default avatarTina Ruchandani <ruchandani.tina@gmail.com>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 59c03699

net/atm/common.c

+1 −1
Original line number Diff line number Diff line
@@ -14,7 +14,7 @@ 
#include <linux/capability.h>

#include <linux/mm.h>

#include <linux/sched/signal.h>

#include <linux/time.h>		/* struct timeval */

#include <linux/time64.h>	/* 64-bit time for seconds */

#include <linux/skbuff.h>

#include <linux/bitops.h>

#include <linux/init.h>

net/atm/mpc.c

+5 −4
Original line number Diff line number Diff line
@@ -1089,7 +1089,7 @@ static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 
		msg->type = SND_MPOA_RES_RQST;

		msg->content.in_info = entry->ctrl_info;

		msg_to_mpoad(msg, mpc);

		do_gettimeofday(&(entry->reply_wait));

		entry->reply_wait = ktime_get_seconds();

		mpc->in_ops->put(entry);

		return;

	}
@@ -1099,7 +1099,7 @@ static void MPOA_trigger_rcvd(struct k_message *msg, struct mpoa_client *mpc) 
		msg->type = SND_MPOA_RES_RQST;

		msg->content.in_info = entry->ctrl_info;

		msg_to_mpoad(msg, mpc);

		do_gettimeofday(&(entry->reply_wait));

		entry->reply_wait = ktime_get_seconds();

		mpc->in_ops->put(entry);

		return;

	}
@@ -1175,8 +1175,9 @@ static void MPOA_res_reply_rcvd(struct k_message *msg, struct mpoa_client *mpc) 
	}



	entry->ctrl_info = msg->content.in_info;

	do_gettimeofday(&(entry->tv));

	do_gettimeofday(&(entry->reply_wait)); /* Used in refreshing func from now on */

	entry->time = ktime_get_seconds();

	/* Used in refreshing func from now on */

	entry->reply_wait = ktime_get_seconds();

	entry->refresh_time = 0;

	ddprintk_cont("entry->shortcut = %p\n", entry->shortcut);

net/atm/mpoa_caches.c

+23 −25
Original line number Diff line number Diff line
@@ -117,7 +117,7 @@ static in_cache_entry *in_cache_add_entry(__be32 dst_ip, 


	memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);

	entry->ctrl_info.in_dst_ip = dst_ip;

	do_gettimeofday(&(entry->tv));

	entry->time = ktime_get_seconds();

	entry->retry_time = client->parameters.mpc_p4;

	entry->count = 1;

	entry->entry_state = INGRESS_INVALID;
@@ -148,7 +148,7 @@ static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc) 
			if (qos != NULL)

				msg.qos = qos->qos;

			msg_to_mpoad(&msg, mpc);

			do_gettimeofday(&(entry->reply_wait));

			entry->reply_wait = ktime_get_seconds();

			entry->entry_state = INGRESS_RESOLVING;

		}

		if (entry->shortcut != NULL)
@@ -171,7 +171,7 @@ static int cache_hit(in_cache_entry *entry, struct mpoa_client *mpc) 
		if (qos != NULL)

			msg.qos = qos->qos;

		msg_to_mpoad(&msg, mpc);

		do_gettimeofday(&(entry->reply_wait));

		entry->reply_wait = ktime_get_seconds();

	}



	return CLOSED;
@@ -227,17 +227,16 @@ static void in_cache_remove_entry(in_cache_entry *entry, 
static void clear_count_and_expired(struct mpoa_client *client)

{

	in_cache_entry *entry, *next_entry;

	struct timeval now;

	time64_t now;



	do_gettimeofday(&now);

	now = ktime_get_seconds();



	write_lock_bh(&client->ingress_lock);

	entry = client->in_cache;

	while (entry != NULL) {

		entry->count = 0;

		next_entry = entry->next;

		if ((now.tv_sec - entry->tv.tv_sec)

		   > entry->ctrl_info.holding_time) {

		if ((now - entry->time) > entry->ctrl_info.holding_time) {

			dprintk("holding time expired, ip = %pI4\n",

				&entry->ctrl_info.in_dst_ip);

			client->in_ops->remove_entry(entry, client);
@@ -253,35 +252,35 @@ static void check_resolving_entries(struct mpoa_client *client) 


	struct atm_mpoa_qos *qos;

	in_cache_entry *entry;

	struct timeval now;

	time64_t now;

	struct k_message msg;



	do_gettimeofday(&now);

	now = ktime_get_seconds();



	read_lock_bh(&client->ingress_lock);

	entry = client->in_cache;

	while (entry != NULL) {

		if (entry->entry_state == INGRESS_RESOLVING) {

			if ((now.tv_sec - entry->hold_down.tv_sec) <

			    client->parameters.mpc_p6) {



			if ((now - entry->hold_down)

					< client->parameters.mpc_p6) {

				entry = entry->next;	/* Entry in hold down */

				continue;

			}

			if ((now.tv_sec - entry->reply_wait.tv_sec) >

			    entry->retry_time) {

			if ((now - entry->reply_wait) > entry->retry_time) {

				entry->retry_time = MPC_C1 * (entry->retry_time);

				/*

				 * Retry time maximum exceeded,

				 * put entry in hold down.

				 */

				if (entry->retry_time > client->parameters.mpc_p5) {

					do_gettimeofday(&(entry->hold_down));

					entry->hold_down = ktime_get_seconds();

					entry->retry_time = client->parameters.mpc_p4;

					entry = entry->next;

					continue;

				}

				/* Ask daemon to send a resolution request. */

				memset(&(entry->hold_down), 0, sizeof(struct timeval));

				memset(&entry->hold_down, 0, sizeof(time64_t));

				msg.type = SND_MPOA_RES_RTRY;

				memcpy(msg.MPS_ctrl, client->mps_ctrl_addr, ATM_ESA_LEN);

				msg.content.in_info = entry->ctrl_info;
@@ -289,7 +288,7 @@ static void check_resolving_entries(struct mpoa_client *client) 
				if (qos != NULL)

					msg.qos = qos->qos;

				msg_to_mpoad(&msg, client);

				do_gettimeofday(&(entry->reply_wait));

				entry->reply_wait = ktime_get_seconds();

			}

		}

		entry = entry->next;
@@ -300,18 +299,18 @@ static void check_resolving_entries(struct mpoa_client *client) 
/* Call this every MPC-p5 seconds. */

static void refresh_entries(struct mpoa_client *client)

{

	struct timeval now;

	time64_t now;

	struct in_cache_entry *entry = client->in_cache;



	ddprintk("refresh_entries\n");

	do_gettimeofday(&now);

	now = ktime_get_seconds();



	read_lock_bh(&client->ingress_lock);

	while (entry != NULL) {

		if (entry->entry_state == INGRESS_RESOLVED) {

			if (!(entry->refresh_time))

				entry->refresh_time = (2 * (entry->ctrl_info.holding_time))/3;

			if ((now.tv_sec - entry->reply_wait.tv_sec) >

			if ((now - entry->reply_wait) >

			    entry->refresh_time) {

				dprintk("refreshing an entry.\n");

				entry->entry_state = INGRESS_REFRESHING;
@@ -480,7 +479,7 @@ static eg_cache_entry *eg_cache_add_entry(struct k_message *msg, 


	memcpy(entry->MPS_ctrl_ATM_addr, client->mps_ctrl_addr, ATM_ESA_LEN);

	entry->ctrl_info = msg->content.eg_info;

	do_gettimeofday(&(entry->tv));

	entry->time = ktime_get_seconds();

	entry->entry_state = EGRESS_RESOLVED;

	dprintk("new_eg_cache_entry cache_id %u\n",

		ntohl(entry->ctrl_info.cache_id));
@@ -495,7 +494,7 @@ static eg_cache_entry *eg_cache_add_entry(struct k_message *msg, 


static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time)

{

	do_gettimeofday(&(entry->tv));

	entry->time = ktime_get_seconds();

	entry->entry_state = EGRESS_RESOLVED;

	entry->ctrl_info.holding_time = holding_time;

}
@@ -503,17 +502,16 @@ static void update_eg_cache_entry(eg_cache_entry *entry, uint16_t holding_time) 
static void clear_expired(struct mpoa_client *client)

{

	eg_cache_entry *entry, *next_entry;

	struct timeval now;

	time64_t now;

	struct k_message msg;



	do_gettimeofday(&now);

	now = ktime_get_seconds();



	write_lock_irq(&client->egress_lock);

	entry = client->eg_cache;

	while (entry != NULL) {

		next_entry = entry->next;

		if ((now.tv_sec - entry->tv.tv_sec)

		   > entry->ctrl_info.holding_time) {

		if ((now - entry->time) > entry->ctrl_info.holding_time) {

			msg.type = SND_EGRESS_PURGE;

			msg.content.eg_info = entry->ctrl_info;

			dprintk("egress_cache: holding time expired, cache_id = %u.\n",

net/atm/mpoa_caches.h

+5 −4
Original line number Diff line number Diff line
@@ -2,6 +2,7 @@ 
#ifndef MPOA_CACHES_H

#define MPOA_CACHES_H



#include <linux/time64.h>

#include <linux/netdevice.h>

#include <linux/types.h>

#include <linux/atm.h>
@@ -16,9 +17,9 @@ void atm_mpoa_init_cache(struct mpoa_client *mpc); 
typedef struct in_cache_entry {

	struct in_cache_entry *next;

	struct in_cache_entry *prev;

	struct timeval  tv;

	struct timeval  reply_wait;

	struct timeval  hold_down;

	time64_t  time;

	time64_t  reply_wait;

	time64_t  hold_down;

	uint32_t  packets_fwded;

	uint16_t  entry_state;

	uint32_t retry_time;
@@ -53,7 +54,7 @@ struct in_cache_ops{ 
typedef struct eg_cache_entry{

	struct               eg_cache_entry *next;

	struct               eg_cache_entry *prev;

	struct               timeval  tv;

	time64_t	     time;

	uint8_t              MPS_ctrl_ATM_addr[ATM_ESA_LEN];

	struct atm_vcc       *shortcut;

	uint32_t             packets_rcvd;

net/atm/mpoa_proc.c

+9 −6
Original line number Diff line number Diff line
@@ -8,7 +8,7 @@ 
#include <linux/mm.h>

#include <linux/module.h>

#include <linux/proc_fs.h>

#include <linux/time.h>

#include <linux/ktime.h>

#include <linux/seq_file.h>

#include <linux/uaccess.h>

#include <linux/atmmpc.h>
@@ -138,7 +138,7 @@ static int mpc_show(struct seq_file *m, void *v) 
	int i;

	in_cache_entry *in_entry;

	eg_cache_entry *eg_entry;

	struct timeval now;

	time64_t now;

	unsigned char ip_string[16];



	if (v == SEQ_START_TOKEN) {
@@ -148,15 +148,17 @@ static int mpc_show(struct seq_file *m, void *v) 


	seq_printf(m, "\nInterface %d:\n\n", mpc->dev_num);

	seq_printf(m, "Ingress Entries:\nIP address      State      Holding time  Packets fwded  VPI  VCI\n");

	do_gettimeofday(&now);

	now = ktime_get_seconds();



	for (in_entry = mpc->in_cache; in_entry; in_entry = in_entry->next) {

		unsigned long seconds_delta = now - in_entry->time;



		sprintf(ip_string, "%pI4", &in_entry->ctrl_info.in_dst_ip);

		seq_printf(m, "%-16s%s%-14lu%-12u",

			   ip_string,

			   ingress_state_string(in_entry->entry_state),

			   in_entry->ctrl_info.holding_time -

			   (now.tv_sec-in_entry->tv.tv_sec),

			   seconds_delta,

			   in_entry->packets_fwded);

		if (in_entry->shortcut)

			seq_printf(m, "   %-3d  %-3d",
@@ -169,13 +171,14 @@ static int mpc_show(struct seq_file *m, void *v) 
	seq_printf(m, "Egress Entries:\nIngress MPC ATM addr\nCache-id        State      Holding time  Packets recvd  Latest IP addr   VPI VCI\n");

	for (eg_entry = mpc->eg_cache; eg_entry; eg_entry = eg_entry->next) {

		unsigned char *p = eg_entry->ctrl_info.in_MPC_data_ATM_addr;

		unsigned long seconds_delta = now - eg_entry->time;



		for (i = 0; i < ATM_ESA_LEN; i++)

			seq_printf(m, "%02x", p[i]);

		seq_printf(m, "\n%-16lu%s%-14lu%-15u",

			   (unsigned long)ntohl(eg_entry->ctrl_info.cache_id),

			   egress_state_string(eg_entry->entry_state),

			   (eg_entry->ctrl_info.holding_time -

			    (now.tv_sec-eg_entry->tv.tv_sec)),

			   (eg_entry->ctrl_info.holding_time - seconds_delta),

			   eg_entry->packets_rcvd);



		/* latest IP address */