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tipc: make subscriber server support net namespace
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TIPC establishes one subscriber server which allows users to subscribe
their interesting name service status. After tipc supports namespace,
one dedicated tipc stack instance is created for each namespace, and
each instance can be deemed as one independent TIPC node. As a result,
subscriber server must be built for each namespace.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Tested-by: Tero Aho <Tero.Aho@coriant.com>
Reviewed-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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ying-xue authored and davem330 committed Jan 12, 2015
1 parent 3474753 commit a62fbcc
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Showing 8 changed files with 86 additions and 65 deletions.
24 changes: 12 additions & 12 deletions net/tipc/core.c
Original file line number Diff line number Diff line change
Expand Up @@ -68,8 +68,14 @@ static int __net_init tipc_init_net(struct net *net)
err = tipc_nametbl_init(net);
if (err)
goto out_nametbl;

err = tipc_subscr_start(net);
if (err)
goto out_subscr;
return 0;

out_subscr:
tipc_nametbl_stop(net);
out_nametbl:
tipc_sk_rht_destroy(net);
out_sk_rht:
Expand All @@ -78,6 +84,7 @@ static int __net_init tipc_init_net(struct net *net)

static void __net_exit tipc_exit_net(struct net *net)
{
tipc_subscr_stop(net);
tipc_net_stop(net);
tipc_nametbl_stop(net);
tipc_sk_rht_destroy(net);
Expand All @@ -104,10 +111,6 @@ static int __init tipc_init(void)

get_random_bytes(&tipc_random, sizeof(tipc_random));

err = register_pernet_subsys(&tipc_net_ops);
if (err)
goto out_pernet;

err = tipc_netlink_start();
if (err)
goto out_netlink;
Expand All @@ -120,9 +123,9 @@ static int __init tipc_init(void)
if (err)
goto out_sysctl;

err = tipc_subscr_start();
err = register_pernet_subsys(&tipc_net_ops);
if (err)
goto out_subscr;
goto out_pernet;

err = tipc_bearer_setup();
if (err)
Expand All @@ -131,28 +134,25 @@ static int __init tipc_init(void)
pr_info("Started in single node mode\n");
return 0;
out_bearer:
tipc_subscr_stop();
out_subscr:
unregister_pernet_subsys(&tipc_net_ops);
out_pernet:
tipc_unregister_sysctl();
out_sysctl:
tipc_socket_stop();
out_socket:
tipc_netlink_stop();
out_netlink:
unregister_pernet_subsys(&tipc_net_ops);
out_pernet:
pr_err("Unable to start in single node mode\n");
return err;
}

static void __exit tipc_exit(void)
{
unregister_pernet_subsys(&tipc_net_ops);
tipc_bearer_cleanup();
tipc_netlink_stop();
tipc_subscr_stop();
tipc_socket_stop();
tipc_unregister_sysctl();
unregister_pernet_subsys(&tipc_net_ops);

pr_info("Deactivated\n");
}
Expand Down
4 changes: 4 additions & 0 deletions net/tipc/core.h
Original file line number Diff line number Diff line change
Expand Up @@ -106,6 +106,10 @@ struct tipc_net {
/* Name table */
spinlock_t nametbl_lock;
struct name_table *nametbl;

/* Topology subscription server */
struct tipc_server *topsrv;
atomic_t subscription_count;
};

#ifdef CONFIG_SYSCTL
Expand Down
2 changes: 1 addition & 1 deletion net/tipc/server.c
Original file line number Diff line number Diff line change
Expand Up @@ -309,7 +309,7 @@ static struct socket *tipc_create_listen_sock(struct tipc_conn *con)
struct socket *sock = NULL;
int ret;

ret = tipc_sock_create_local(s->type, &sock);
ret = tipc_sock_create_local(s->net, s->type, &sock);
if (ret < 0)
return NULL;
ret = kernel_setsockopt(sock, SOL_TIPC, TIPC_IMPORTANCE,
Expand Down
4 changes: 3 additions & 1 deletion net/tipc/server.h
Original file line number Diff line number Diff line change
Expand Up @@ -47,6 +47,7 @@
* @conn_idr: identifier set of connection
* @idr_lock: protect the connection identifier set
* @idr_in_use: amount of allocated identifier entry
* @net: network namspace instance
* @rcvbuf_cache: memory cache of server receive buffer
* @rcv_wq: receive workqueue
* @send_wq: send workqueue
Expand All @@ -63,6 +64,7 @@ struct tipc_server {
struct idr conn_idr;
spinlock_t idr_lock;
int idr_in_use;
struct net *net;
struct kmem_cache *rcvbuf_cache;
struct workqueue_struct *rcv_wq;
struct workqueue_struct *send_wq;
Expand All @@ -73,7 +75,7 @@ struct tipc_server {
struct sockaddr_tipc *addr, void *usr_data,
void *buf, size_t len);
struct sockaddr_tipc *saddr;
const char name[TIPC_SERVER_NAME_LEN];
char name[TIPC_SERVER_NAME_LEN];
int imp;
int type;
};
Expand Down
4 changes: 2 additions & 2 deletions net/tipc/socket.c
Original file line number Diff line number Diff line change
Expand Up @@ -388,7 +388,7 @@ static int tipc_sk_create(struct net *net, struct socket *sock,
*
* Returns 0 on success, errno otherwise
*/
int tipc_sock_create_local(int type, struct socket **res)
int tipc_sock_create_local(struct net *net, int type, struct socket **res)
{
int rc;

Expand All @@ -397,7 +397,7 @@ int tipc_sock_create_local(int type, struct socket **res)
pr_err("Failed to create kernel socket\n");
return rc;
}
tipc_sk_create(&init_net, *res, 0, 1);
tipc_sk_create(net, *res, 0, 1);

return 0;
}
Expand Down
2 changes: 1 addition & 1 deletion net/tipc/socket.h
Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@

int tipc_socket_init(void);
void tipc_socket_stop(void);
int tipc_sock_create_local(int type, struct socket **res);
int tipc_sock_create_local(struct net *net, int type, struct socket **res);
void tipc_sock_release_local(struct socket *sock);
int tipc_sock_accept_local(struct socket *sock, struct socket **newsock,
int flags);
Expand Down
104 changes: 61 additions & 43 deletions net/tipc/subscr.c
Original file line number Diff line number Diff line change
Expand Up @@ -50,34 +50,6 @@ struct tipc_subscriber {
struct list_head subscription_list;
};

static void subscr_conn_msg_event(struct net *net, int conid,
struct sockaddr_tipc *addr, void *usr_data,
void *buf, size_t len);
static void *subscr_named_msg_event(int conid);
static void subscr_conn_shutdown_event(int conid, void *usr_data);

static atomic_t subscription_count = ATOMIC_INIT(0);

static struct sockaddr_tipc topsrv_addr __read_mostly = {
.family = AF_TIPC,
.addrtype = TIPC_ADDR_NAMESEQ,
.addr.nameseq.type = TIPC_TOP_SRV,
.addr.nameseq.lower = TIPC_TOP_SRV,
.addr.nameseq.upper = TIPC_TOP_SRV,
.scope = TIPC_NODE_SCOPE
};

static struct tipc_server topsrv __read_mostly = {
.saddr = &topsrv_addr,
.imp = TIPC_CRITICAL_IMPORTANCE,
.type = SOCK_SEQPACKET,
.max_rcvbuf_size = sizeof(struct tipc_subscr),
.name = "topology_server",
.tipc_conn_recvmsg = subscr_conn_msg_event,
.tipc_conn_new = subscr_named_msg_event,
.tipc_conn_shutdown = subscr_conn_shutdown_event,
};

/**
* htohl - convert value to endianness used by destination
* @in: value to convert
Expand All @@ -94,6 +66,7 @@ static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
u32 found_upper, u32 event, u32 port_ref,
u32 node)
{
struct tipc_net *tn = net_generic(sub->net, tipc_net_id);
struct tipc_subscriber *subscriber = sub->subscriber;
struct kvec msg_sect;

Expand All @@ -104,8 +77,8 @@ static void subscr_send_event(struct tipc_subscription *sub, u32 found_lower,
sub->evt.found_upper = htohl(found_upper, sub->swap);
sub->evt.port.ref = htohl(port_ref, sub->swap);
sub->evt.port.node = htohl(node, sub->swap);
tipc_conn_sendmsg(&topsrv, subscriber->conid, NULL, msg_sect.iov_base,
msg_sect.iov_len);
tipc_conn_sendmsg(tn->topsrv, subscriber->conid, NULL,
msg_sect.iov_base, msg_sect.iov_len);
}

/**
Expand Down Expand Up @@ -146,6 +119,7 @@ static void subscr_timeout(unsigned long data)
{
struct tipc_subscription *sub = (struct tipc_subscription *)data;
struct tipc_subscriber *subscriber = sub->subscriber;
struct tipc_net *tn = net_generic(sub->net, tipc_net_id);

/* The spin lock per subscriber is used to protect its members */
spin_lock_bh(&subscriber->lock);
Expand All @@ -170,7 +144,7 @@ static void subscr_timeout(unsigned long data)

/* Now destroy subscription */
kfree(sub);
atomic_dec(&subscription_count);
atomic_dec(&tn->subscription_count);
}

/**
Expand All @@ -180,20 +154,25 @@ static void subscr_timeout(unsigned long data)
*/
static void subscr_del(struct tipc_subscription *sub)
{
struct tipc_net *tn = net_generic(sub->net, tipc_net_id);

tipc_nametbl_unsubscribe(sub);
list_del(&sub->subscription_list);
kfree(sub);
atomic_dec(&subscription_count);
atomic_dec(&tn->subscription_count);
}

/**
* subscr_terminate - terminate communication with a subscriber
*
* Note: Must call it in process context since it might sleep.
*/
static void subscr_terminate(struct tipc_subscriber *subscriber)
static void subscr_terminate(struct tipc_subscription *sub)
{
tipc_conn_terminate(&topsrv, subscriber->conid);
struct tipc_subscriber *subscriber = sub->subscriber;
struct tipc_net *tn = net_generic(sub->net, tipc_net_id);

tipc_conn_terminate(tn->topsrv, subscriber->conid);
}

static void subscr_release(struct tipc_subscriber *subscriber)
Expand Down Expand Up @@ -263,7 +242,9 @@ static void subscr_cancel(struct tipc_subscr *s,
*/
static int subscr_subscribe(struct net *net, struct tipc_subscr *s,
struct tipc_subscriber *subscriber,
struct tipc_subscription **sub_p) {
struct tipc_subscription **sub_p)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_subscription *sub;
int swap;

Expand All @@ -278,7 +259,7 @@ static int subscr_subscribe(struct net *net, struct tipc_subscr *s,
}

/* Refuse subscription if global limit exceeded */
if (atomic_read(&subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
if (atomic_read(&tn->subscription_count) >= TIPC_MAX_SUBSCRIPTIONS) {
pr_warn("Subscription rejected, limit reached (%u)\n",
TIPC_MAX_SUBSCRIPTIONS);
return -EINVAL;
Expand Down Expand Up @@ -309,7 +290,7 @@ static int subscr_subscribe(struct net *net, struct tipc_subscr *s,
sub->subscriber = subscriber;
sub->swap = swap;
memcpy(&sub->evt.s, s, sizeof(struct tipc_subscr));
atomic_inc(&subscription_count);
atomic_inc(&tn->subscription_count);
if (sub->timeout != TIPC_WAIT_FOREVER) {
setup_timer(&sub->timer, subscr_timeout, (unsigned long)sub);
mod_timer(&sub->timer, jiffies + sub->timeout);
Expand All @@ -336,15 +317,14 @@ static void subscr_conn_msg_event(struct net *net, int conid,
if (subscr_subscribe(net, (struct tipc_subscr *)buf, subscriber,
&sub) < 0) {
spin_unlock_bh(&subscriber->lock);
subscr_terminate(subscriber);
subscr_terminate(sub);
return;
}
if (sub)
tipc_nametbl_subscribe(sub);
spin_unlock_bh(&subscriber->lock);
}


/* Handle one request to establish a new subscriber */
static void *subscr_named_msg_event(int conid)
{
Expand All @@ -363,12 +343,50 @@ static void *subscr_named_msg_event(int conid)
return (void *)subscriber;
}

int tipc_subscr_start(void)
int tipc_subscr_start(struct net *net)
{
return tipc_server_start(&topsrv);
struct tipc_net *tn = net_generic(net, tipc_net_id);
const char name[] = "topology_server";
struct tipc_server *topsrv;
struct sockaddr_tipc *saddr;

saddr = kzalloc(sizeof(*saddr), GFP_ATOMIC);
if (!saddr)
return -ENOMEM;
saddr->family = AF_TIPC;
saddr->addrtype = TIPC_ADDR_NAMESEQ;
saddr->addr.nameseq.type = TIPC_TOP_SRV;
saddr->addr.nameseq.lower = TIPC_TOP_SRV;
saddr->addr.nameseq.upper = TIPC_TOP_SRV;
saddr->scope = TIPC_NODE_SCOPE;

topsrv = kzalloc(sizeof(*topsrv), GFP_ATOMIC);
if (!topsrv) {
kfree(saddr);
return -ENOMEM;
}
topsrv->net = net;
topsrv->saddr = saddr;
topsrv->imp = TIPC_CRITICAL_IMPORTANCE;
topsrv->type = SOCK_SEQPACKET;
topsrv->max_rcvbuf_size = sizeof(struct tipc_subscr);
topsrv->tipc_conn_recvmsg = subscr_conn_msg_event;
topsrv->tipc_conn_new = subscr_named_msg_event;
topsrv->tipc_conn_shutdown = subscr_conn_shutdown_event;

strncpy(topsrv->name, name, strlen(name) + 1);
tn->topsrv = topsrv;
atomic_set(&tn->subscription_count, 0);

return tipc_server_start(topsrv);
}

void tipc_subscr_stop(void)
void tipc_subscr_stop(struct net *net)
{
tipc_server_stop(&topsrv);
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_server *topsrv = tn->topsrv;

tipc_server_stop(topsrv);
kfree(topsrv->saddr);
kfree(topsrv);
}
7 changes: 2 additions & 5 deletions net/tipc/subscr.h
Original file line number Diff line number Diff line change
Expand Up @@ -74,13 +74,10 @@ struct tipc_subscription {

int tipc_subscr_overlap(struct tipc_subscription *sub, u32 found_lower,
u32 found_upper);

void tipc_subscr_report_overlap(struct tipc_subscription *sub, u32 found_lower,
u32 found_upper, u32 event, u32 port_ref,
u32 node, int must);

int tipc_subscr_start(void);

void tipc_subscr_stop(void);
int tipc_subscr_start(struct net *net);
void tipc_subscr_stop(struct net *net);

#endif

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