Commit 6670e152 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

tcp: Namespace-ify sysctl_tcp_default_congestion_control 



Make default TCP default congestion control to a per namespace
value. This changes default congestion control to a pointer to congestion ops
(rather than implicit as first element of available lsit).

The congestion control setting of new namespaces is inherited
from the current setting of the root namespace.

Signed-off-by: default avatarStephen Hemminger <sthemmin@microsoft.com>
Reviewed-by: default avatarEric Dumazet <edumazet@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 11bf284f

include/net/netns/ipv4.h

+1 −0
Original line number Diff line number Diff line
@@ -160,6 +160,7 @@ struct netns_ipv4 { 
	struct inet_timewait_death_row tcp_death_row;

	int sysctl_max_syn_backlog;

	int sysctl_tcp_fastopen;

	const struct tcp_congestion_ops __rcu  *tcp_congestion_control;

	struct tcp_fastopen_context __rcu *tcp_fastopen_ctx;

	spinlock_t tcp_fastopen_ctx_lock;

	unsigned int sysctl_tcp_fastopen_blackhole_timeout;

include/net/tcp.h

+3 −3
Original line number Diff line number Diff line
@@ -1002,8 +1002,8 @@ void tcp_unregister_congestion_control(struct tcp_congestion_ops *type); 
void tcp_assign_congestion_control(struct sock *sk);

void tcp_init_congestion_control(struct sock *sk);

void tcp_cleanup_congestion_control(struct sock *sk);

int tcp_set_default_congestion_control(const char *name);

void tcp_get_default_congestion_control(char *name);

int tcp_set_default_congestion_control(struct net *net, const char *name);

void tcp_get_default_congestion_control(struct net *net, char *name);

void tcp_get_available_congestion_control(char *buf, size_t len);

void tcp_get_allowed_congestion_control(char *buf, size_t len);

int tcp_set_allowed_congestion_control(char *allowed);
@@ -1017,7 +1017,7 @@ void tcp_reno_cong_avoid(struct sock *sk, u32 ack, u32 acked); 
extern struct tcp_congestion_ops tcp_reno;



struct tcp_congestion_ops *tcp_ca_find_key(u32 key);

u32 tcp_ca_get_key_by_name(const char *name, bool *ecn_ca);

u32 tcp_ca_get_key_by_name(struct net *net, const char *name, bool *ecn_ca);

#ifdef CONFIG_INET

char *tcp_ca_get_name_by_key(u32 key, char *buffer);

#else

net/ipv4/fib_semantics.c

+2 −2
Original line number Diff line number Diff line
@@ -710,7 +710,7 @@ bool fib_metrics_match(struct fib_config *cfg, struct fib_info *fi) 
			bool ecn_ca = false;



			nla_strlcpy(tmp, nla, sizeof(tmp));

			val = tcp_ca_get_key_by_name(tmp, &ecn_ca);

			val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca);

		} else {

			val = nla_get_u32(nla);

		}
@@ -1030,7 +1030,7 @@ fib_convert_metrics(struct fib_info *fi, const struct fib_config *cfg) 
			char tmp[TCP_CA_NAME_MAX];



			nla_strlcpy(tmp, nla, sizeof(tmp));

			val = tcp_ca_get_key_by_name(tmp, &ecn_ca);

			val = tcp_ca_get_key_by_name(fi->fib_net, tmp, &ecn_ca);

			if (val == TCP_CA_UNSPEC)

				return -EINVAL;

		} else {

net/ipv4/sysctl_net_ipv4.c

+11 −8
Original line number Diff line number Diff line
@@ -201,6 +201,8 @@ static int ipv4_ping_group_range(struct ctl_table *table, int write, 
static int proc_tcp_congestion_control(struct ctl_table *ctl, int write,

				       void __user *buffer, size_t *lenp, loff_t *ppos)

{

	struct net *net = container_of(ctl->data, struct net,

				       ipv4.tcp_congestion_control);

	char val[TCP_CA_NAME_MAX];

	struct ctl_table tbl = {

		.data = val,
@@ -208,11 +210,11 @@ static int proc_tcp_congestion_control(struct ctl_table *ctl, int write, 
	};

	int ret;



	tcp_get_default_congestion_control(val);

	tcp_get_default_congestion_control(net, val);



	ret = proc_dostring(&tbl, write, buffer, lenp, ppos);

	if (write && ret == 0)

		ret = tcp_set_default_congestion_control(val);

		ret = tcp_set_default_congestion_control(net, val);

	return ret;

}
@@ -447,12 +449,6 @@ static struct ctl_table ipv4_table[] = { 
		.mode		= 0644,

		.proc_handler	= proc_dointvec

	},

	{

		.procname	= "tcp_congestion_control",

		.mode		= 0644,

		.maxlen		= TCP_CA_NAME_MAX,

		.proc_handler	= proc_tcp_congestion_control,

	},

#ifdef CONFIG_NETLABEL

	{

		.procname	= "cipso_cache_enable",
@@ -763,6 +759,13 @@ static struct ctl_table ipv4_net_table[] = { 
		.extra1		= &one

	},

#endif

	{

		.procname	= "tcp_congestion_control",

		.data		= &init_net.ipv4.tcp_congestion_control,

		.mode		= 0644,

		.maxlen		= TCP_CA_NAME_MAX,

		.proc_handler	= proc_tcp_congestion_control,

	},

	{

		.procname	= "tcp_keepalive_time",

		.data		= &init_net.ipv4.sysctl_tcp_keepalive_time,

net/ipv4/tcp_cong.c

+36 −40
Original line number Diff line number Diff line
@@ -33,9 +33,11 @@ static struct tcp_congestion_ops *tcp_ca_find(const char *name) 
}



/* Must be called with rcu lock held */

static const struct tcp_congestion_ops *__tcp_ca_find_autoload(const char *name)

static struct tcp_congestion_ops *tcp_ca_find_autoload(struct net *net,

						       const char *name)

{

	const struct tcp_congestion_ops *ca = tcp_ca_find(name);

	struct tcp_congestion_ops *ca = tcp_ca_find(name);



#ifdef CONFIG_MODULES

	if (!ca && capable(CAP_NET_ADMIN)) {

		rcu_read_unlock();
@@ -115,7 +117,7 @@ void tcp_unregister_congestion_control(struct tcp_congestion_ops *ca) 
}

EXPORT_SYMBOL_GPL(tcp_unregister_congestion_control);



u32 tcp_ca_get_key_by_name(const char *name, bool *ecn_ca)

u32 tcp_ca_get_key_by_name(struct net *net, const char *name, bool *ecn_ca)

{

	const struct tcp_congestion_ops *ca;

	u32 key = TCP_CA_UNSPEC;
@@ -123,7 +125,7 @@ u32 tcp_ca_get_key_by_name(const char *name, bool *ecn_ca) 
	might_sleep();



	rcu_read_lock();

	ca = __tcp_ca_find_autoload(name);

	ca = tcp_ca_find_autoload(net, name);

	if (ca) {

		key = ca->key;

		*ecn_ca = ca->flags & TCP_CONG_NEEDS_ECN;
@@ -153,23 +155,18 @@ EXPORT_SYMBOL_GPL(tcp_ca_get_name_by_key); 
/* Assign choice of congestion control. */

void tcp_assign_congestion_control(struct sock *sk)

{

	struct net *net = sock_net(sk);

	struct inet_connection_sock *icsk = inet_csk(sk);

	struct tcp_congestion_ops *ca;

	const struct tcp_congestion_ops *ca;



	rcu_read_lock();

	list_for_each_entry_rcu(ca, &tcp_cong_list, list) {

		if (likely(try_module_get(ca->owner))) {

	ca = rcu_dereference(net->ipv4.tcp_congestion_control);

	if (unlikely(!try_module_get(ca->owner)))

		ca = &tcp_reno;

	icsk->icsk_ca_ops = ca;

			goto out;

		}

		/* Fallback to next available. The last really

		 * guaranteed fallback is Reno from this list.

		 */

	}

out:

	rcu_read_unlock();

	memset(icsk->icsk_ca_priv, 0, sizeof(icsk->icsk_ca_priv));



	memset(icsk->icsk_ca_priv, 0, sizeof(icsk->icsk_ca_priv));

	if (ca->flags & TCP_CONG_NEEDS_ECN)

		INET_ECN_xmit(sk);

	else
@@ -214,29 +211,27 @@ void tcp_cleanup_congestion_control(struct sock *sk) 
}



/* Used by sysctl to change default congestion control */

int tcp_set_default_congestion_control(const char *name)

int tcp_set_default_congestion_control(struct net *net, const char *name)

{

	struct tcp_congestion_ops *ca;

	int ret = -ENOENT;

	const struct tcp_congestion_ops *prev;

	int ret;



	spin_lock(&tcp_cong_list_lock);

	ca = tcp_ca_find(name);

#ifdef CONFIG_MODULES

	if (!ca && capable(CAP_NET_ADMIN)) {

		spin_unlock(&tcp_cong_list_lock);



		request_module("tcp_%s", name);

		spin_lock(&tcp_cong_list_lock);

		ca = tcp_ca_find(name);

	}

#endif

	rcu_read_lock();

	ca = tcp_ca_find_autoload(net, name);

	if (!ca) {

		ret = -ENOENT;

	} else if (!try_module_get(ca->owner)) {

		ret = -EBUSY;

	} else {

		prev = xchg(&net->ipv4.tcp_congestion_control, ca);

		if (prev)

			module_put(prev->owner);



	if (ca) {

		ca->flags |= TCP_CONG_NON_RESTRICTED;	/* default is always allowed */

		list_move(&ca->list, &tcp_cong_list);

		ca->flags |= TCP_CONG_NON_RESTRICTED;

		ret = 0;

	}

	spin_unlock(&tcp_cong_list_lock);

	rcu_read_unlock();



	return ret;

}
@@ -244,7 +239,8 @@ int tcp_set_default_congestion_control(const char *name) 
/* Set default value from kernel configuration at bootup */

static int __init tcp_congestion_default(void)

{

	return tcp_set_default_congestion_control(CONFIG_DEFAULT_TCP_CONG);

	return tcp_set_default_congestion_control(&init_net,

						  CONFIG_DEFAULT_TCP_CONG);

}

late_initcall(tcp_congestion_default);
@@ -264,14 +260,12 @@ void tcp_get_available_congestion_control(char *buf, size_t maxlen) 
}



/* Get current default congestion control */

void tcp_get_default_congestion_control(char *name)

void tcp_get_default_congestion_control(struct net *net, char *name)

{

	struct tcp_congestion_ops *ca;

	/* We will always have reno... */

	BUG_ON(list_empty(&tcp_cong_list));

	const struct tcp_congestion_ops *ca;



	rcu_read_lock();

	ca = list_entry(tcp_cong_list.next, struct tcp_congestion_ops, list);

	ca = rcu_dereference(net->ipv4.tcp_congestion_control);

	strncpy(name, ca->name, TCP_CA_NAME_MAX);

	rcu_read_unlock();

}
@@ -351,12 +345,14 @@ int tcp_set_congestion_control(struct sock *sk, const char *name, bool load, boo 
	if (!load)

		ca = tcp_ca_find(name);

	else

		ca = __tcp_ca_find_autoload(name);

		ca = tcp_ca_find_autoload(sock_net(sk), name);



	/* No change asking for existing value */

	if (ca == icsk->icsk_ca_ops) {

		icsk->icsk_ca_setsockopt = 1;

		goto out;

	}



	if (!ca) {

		err = -ENOENT;

	} else if (!load) {

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