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linux/net/tipc/bearer.c
Jon Paul Maloy 5b7066c3dd tipc: stricter filtering of packets in bearer layer 
Resetting a bearer/interface, with the consequence of resetting all its
pertaining links, is not an atomic action. This becomes particularly
evident in very large clusters, where a lot of traffic may happen on the
remaining links while we are busy shutting them down. In extreme cases,
we may even see links being re-created and re-established before we are
finished with the job.

To solve this, we now introduce a solution where we temporarily detach
the bearer from the interface when the bearer is reset. This inhibits
all packet reception, while sending still is possible. For the latter,
we use the fact that the device's user pointer now is zero to filter out
which packets can be sent during this situation; i.e., outgoing RESET
messages only.  This filtering serves to speed up the neighbors'
detection of the loss event, and saves us from unnecessary probing.

Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2016-04-07 17:00:13 -04:00

1073 lines
26 KiB
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/*
* net/tipc/bearer.c: TIPC bearer code
*
* Copyright (c) 1996-2006, 2013-2014, Ericsson AB
* Copyright (c) 2004-2006, 2010-2013, Wind River Systems
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the names of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <net/sock.h>
#include "core.h"
#include "bearer.h"
#include "link.h"
#include "discover.h"
#include "bcast.h"
#include "netlink.h"
#define MAX_ADDR_STR 60
static struct tipc_media * const media_info_array[] = {
&eth_media_info,
#ifdef CONFIG_TIPC_MEDIA_IB
&ib_media_info,
#endif
#ifdef CONFIG_TIPC_MEDIA_UDP
&udp_media_info,
#endif
NULL
};
static void bearer_disable(struct net *net, struct tipc_bearer *b);
/**
* tipc_media_find - locates specified media object by name
*/
struct tipc_media *tipc_media_find(const char *name)
{
u32 i;
for (i = 0; media_info_array[i] != NULL; i++) {
if (!strcmp(media_info_array[i]->name, name))
break;
}
return media_info_array[i];
}
/**
* media_find_id - locates specified media object by type identifier
*/
static struct tipc_media *media_find_id(u8 type)
{
u32 i;
for (i = 0; media_info_array[i] != NULL; i++) {
if (media_info_array[i]->type_id == type)
break;
}
return media_info_array[i];
}
/**
* tipc_media_addr_printf - record media address in print buffer
*/
void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a)
{
char addr_str[MAX_ADDR_STR];
struct tipc_media *m;
int ret;
m = media_find_id(a->media_id);
if (m && !m->addr2str(a, addr_str, sizeof(addr_str)))
ret = scnprintf(buf, len, "%s(%s)", m->name, addr_str);
else {
u32 i;
ret = scnprintf(buf, len, "UNKNOWN(%u)", a->media_id);
for (i = 0; i < sizeof(a->value); i++)
ret += scnprintf(buf - ret, len + ret,
"-%02x", a->value[i]);
}
}
/**
* bearer_name_validate - validate & (optionally) deconstruct bearer name
* @name: ptr to bearer name string
* @name_parts: ptr to area for bearer name components (or NULL if not needed)
*
* Returns 1 if bearer name is valid, otherwise 0.
*/
static int bearer_name_validate(const char *name,
struct tipc_bearer_names *name_parts)
{
char name_copy[TIPC_MAX_BEARER_NAME];
char *media_name;
char *if_name;
u32 media_len;
u32 if_len;
/* copy bearer name & ensure length is OK */
name_copy[TIPC_MAX_BEARER_NAME - 1] = 0;
/* need above in case non-Posix strncpy() doesn't pad with nulls */
strncpy(name_copy, name, TIPC_MAX_BEARER_NAME);
if (name_copy[TIPC_MAX_BEARER_NAME - 1] != 0)
return 0;
/* ensure all component parts of bearer name are present */
media_name = name_copy;
if_name = strchr(media_name, ':');
if (if_name == NULL)
return 0;
*(if_name++) = 0;
media_len = if_name - media_name;
if_len = strlen(if_name) + 1;
/* validate component parts of bearer name */
if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) ||
(if_len <= 1) || (if_len > TIPC_MAX_IF_NAME))
return 0;
/* return bearer name components, if necessary */
if (name_parts) {
strcpy(name_parts->media_name, media_name);
strcpy(name_parts->if_name, if_name);
}
return 1;
}
/**
* tipc_bearer_find - locates bearer object with matching bearer name
*/
struct tipc_bearer *tipc_bearer_find(struct net *net, const char *name)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
b = rtnl_dereference(tn->bearer_list[i]);
if (b && (!strcmp(b->name, name)))
return b;
}
return NULL;
}
void tipc_bearer_add_dest(struct net *net, u32 bearer_id, u32 dest)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b;
rcu_read_lock();
b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (b)
tipc_disc_add_dest(b->link_req);
rcu_read_unlock();
}
void tipc_bearer_remove_dest(struct net *net, u32 bearer_id, u32 dest)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b;
rcu_read_lock();
b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (b)
tipc_disc_remove_dest(b->link_req);
rcu_read_unlock();
}
/**
* tipc_enable_bearer - enable bearer with the given name
*/
static int tipc_enable_bearer(struct net *net, const char *name,
u32 disc_domain, u32 priority,
struct nlattr *attr[])
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b;
struct tipc_media *m;
struct tipc_bearer_names b_names;
struct sk_buff *skb;
char addr_string[16];
u32 bearer_id;
u32 with_this_prio;
u32 i;
int res = -EINVAL;
if (!tn->own_addr) {
pr_warn("Bearer <%s> rejected, not supported in standalone mode\n",
name);
return -ENOPROTOOPT;
}
if (!bearer_name_validate(name, &b_names)) {
pr_warn("Bearer <%s> rejected, illegal name\n", name);
return -EINVAL;
}
if (tipc_addr_domain_valid(disc_domain) &&
(disc_domain != tn->own_addr)) {
if (tipc_in_scope(disc_domain, tn->own_addr)) {
disc_domain = tn->own_addr & TIPC_CLUSTER_MASK;
res = 0; /* accept any node in own cluster */
} else if (in_own_cluster_exact(net, disc_domain))
res = 0; /* accept specified node in own cluster */
}
if (res) {
pr_warn("Bearer <%s> rejected, illegal discovery domain\n",
name);
return -EINVAL;
}
if ((priority > TIPC_MAX_LINK_PRI) &&
(priority != TIPC_MEDIA_LINK_PRI)) {
pr_warn("Bearer <%s> rejected, illegal priority\n", name);
return -EINVAL;
}
m = tipc_media_find(b_names.media_name);
if (!m) {
pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
name, b_names.media_name);
return -EINVAL;
}
if (priority == TIPC_MEDIA_LINK_PRI)
priority = m->priority;
restart:
bearer_id = MAX_BEARERS;
with_this_prio = 1;
for (i = MAX_BEARERS; i-- != 0; ) {
b = rtnl_dereference(tn->bearer_list[i]);
if (!b) {
bearer_id = i;
continue;
}
if (!strcmp(name, b->name)) {
pr_warn("Bearer <%s> rejected, already enabled\n",
name);
return -EINVAL;
}
if ((b->priority == priority) &&
(++with_this_prio > 2)) {
if (priority-- == 0) {
pr_warn("Bearer <%s> rejected, duplicate priority\n",
name);
return -EINVAL;
}
pr_warn("Bearer <%s> priority adjustment required %u->%u\n",
name, priority + 1, priority);
goto restart;
}
}
if (bearer_id >= MAX_BEARERS) {
pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
name, MAX_BEARERS);
return -EINVAL;
}
b = kzalloc(sizeof(*b), GFP_ATOMIC);
if (!b)
return -ENOMEM;
strcpy(b->name, name);
b->media = m;
res = m->enable_media(net, b, attr);
if (res) {
pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
name, -res);
return -EINVAL;
}
b->identity = bearer_id;
b->tolerance = m->tolerance;
b->window = m->window;
b->domain = disc_domain;
b->net_plane = bearer_id + 'A';
b->priority = priority;
res = tipc_disc_create(net, b, &b->bcast_addr, &skb);
if (res) {
bearer_disable(net, b);
pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
name);
return -EINVAL;
}
rcu_assign_pointer(tn->bearer_list[bearer_id], b);
if (skb)
tipc_bearer_xmit_skb(net, bearer_id, skb, &b->bcast_addr);
pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
name,
tipc_addr_string_fill(addr_string, disc_domain), priority);
return res;
}
/**
* tipc_reset_bearer - Reset all links established over this bearer
*/
static int tipc_reset_bearer(struct net *net, struct tipc_bearer *b)
{
pr_info("Resetting bearer <%s>\n", b->name);
tipc_node_delete_links(net, b->identity);
tipc_disc_reset(net, b);
return 0;
}
/**
* bearer_disable
*
* Note: This routine assumes caller holds RTNL lock.
*/
static void bearer_disable(struct net *net, struct tipc_bearer *b)
{
struct tipc_net *tn = tipc_net(net);
int bearer_id = b->identity;
pr_info("Disabling bearer <%s>\n", b->name);
b->media->disable_media(b);
tipc_node_delete_links(net, bearer_id);
RCU_INIT_POINTER(b->media_ptr, NULL);
if (b->link_req)
tipc_disc_delete(b->link_req);
RCU_INIT_POINTER(tn->bearer_list[bearer_id], NULL);
kfree_rcu(b, rcu);
}
int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b,
struct nlattr *attr[])
{
struct net_device *dev;
char *driver_name = strchr((const char *)b->name, ':') + 1;
/* Find device with specified name */
dev = dev_get_by_name(net, driver_name);
if (!dev)
return -ENODEV;
/* Associate TIPC bearer with L2 bearer */
rcu_assign_pointer(b->media_ptr, dev);
memset(&b->bcast_addr, 0, sizeof(b->bcast_addr));
memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len);
b->bcast_addr.media_id = b->media->type_id;
b->bcast_addr.broadcast = 1;
b->mtu = dev->mtu;
b->media->raw2addr(b, &b->addr, (char *)dev->dev_addr);
rcu_assign_pointer(dev->tipc_ptr, b);
return 0;
}
/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
*
* Mark L2 bearer as inactive so that incoming buffers are thrown away
*/
void tipc_disable_l2_media(struct tipc_bearer *b)
{
struct net_device *dev;
dev = (struct net_device *)rtnl_dereference(b->media_ptr);
RCU_INIT_POINTER(dev->tipc_ptr, NULL);
synchronize_net();
dev_put(dev);
}
/**
* tipc_l2_send_msg - send a TIPC packet out over an L2 interface
* @skb: the packet to be sent
* @b: the bearer through which the packet is to be sent
* @dest: peer destination address
*/
int tipc_l2_send_msg(struct net *net, struct sk_buff *skb,
struct tipc_bearer *b, struct tipc_media_addr *dest)
{
struct net_device *dev;
int delta;
void *tipc_ptr;
dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
if (!dev)
return 0;
/* Send RESET message even if bearer is detached from device */
tipc_ptr = rtnl_dereference(dev->tipc_ptr);
if (unlikely(!tipc_ptr && !msg_is_reset(buf_msg(skb))))
goto drop;
delta = dev->hard_header_len - skb_headroom(skb);
if ((delta > 0) &&
pskb_expand_head(skb, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC))
goto drop;
skb_reset_network_header(skb);
skb->dev = dev;
skb->protocol = htons(ETH_P_TIPC);
dev_hard_header(skb, dev, ETH_P_TIPC, dest->value,
dev->dev_addr, skb->len);
dev_queue_xmit(skb);
return 0;
drop:
kfree_skb(skb);
return 0;
}
int tipc_bearer_mtu(struct net *net, u32 bearer_id)
{
int mtu = 0;
struct tipc_bearer *b;
rcu_read_lock();
b = rcu_dereference_rtnl(tipc_net(net)->bearer_list[bearer_id]);
if (b)
mtu = b->mtu;
rcu_read_unlock();
return mtu;
}
/* tipc_bearer_xmit_skb - sends buffer to destination over bearer
*/
void tipc_bearer_xmit_skb(struct net *net, u32 bearer_id,
struct sk_buff *skb,
struct tipc_media_addr *dest)
{
struct tipc_net *tn = tipc_net(net);
struct tipc_bearer *b;
rcu_read_lock();
b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (likely(b))
b->media->send_msg(net, skb, b, dest);
else
kfree_skb(skb);
rcu_read_unlock();
}
/* tipc_bearer_xmit() -send buffer to destination over bearer
*/
void tipc_bearer_xmit(struct net *net, u32 bearer_id,
struct sk_buff_head *xmitq,
struct tipc_media_addr *dst)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b;
struct sk_buff *skb, *tmp;
if (skb_queue_empty(xmitq))
return;
rcu_read_lock();
b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (unlikely(!b))
__skb_queue_purge(xmitq);
skb_queue_walk_safe(xmitq, skb, tmp) {
__skb_dequeue(xmitq);
b->media->send_msg(net, skb, b, dst);
}
rcu_read_unlock();
}
/* tipc_bearer_bc_xmit() - broadcast buffers to all destinations
*/
void tipc_bearer_bc_xmit(struct net *net, u32 bearer_id,
struct sk_buff_head *xmitq)
{
struct tipc_net *tn = tipc_net(net);
int net_id = tn->net_id;
struct tipc_bearer *b;
struct sk_buff *skb, *tmp;
struct tipc_msg *hdr;
rcu_read_lock();
b = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (unlikely(!b))
__skb_queue_purge(xmitq);
skb_queue_walk_safe(xmitq, skb, tmp) {
hdr = buf_msg(skb);
msg_set_non_seq(hdr, 1);
msg_set_mc_netid(hdr, net_id);
__skb_dequeue(xmitq);
b->media->send_msg(net, skb, b, &b->bcast_addr);
}
rcu_read_unlock();
}
/**
* tipc_l2_rcv_msg - handle incoming TIPC message from an interface
* @buf: the received packet
* @dev: the net device that the packet was received on
* @pt: the packet_type structure which was used to register this handler
* @orig_dev: the original receive net device in case the device is a bond
*
* Accept only packets explicitly sent to this node, or broadcast packets;
* ignores packets sent using interface multicast, and traffic sent to other
* nodes (which can happen if interface is running in promiscuous mode).
*/
static int tipc_l2_rcv_msg(struct sk_buff *skb, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct tipc_bearer *b;
rcu_read_lock();
b = rcu_dereference_rtnl(dev->tipc_ptr);
if (likely(b && (skb->pkt_type <= PACKET_BROADCAST))) {
skb->next = NULL;
tipc_rcv(dev_net(dev), skb, b);
rcu_read_unlock();
return NET_RX_SUCCESS;
}
rcu_read_unlock();
kfree_skb(skb);
return NET_RX_DROP;
}
/**
* tipc_l2_device_event - handle device events from network device
* @nb: the context of the notification
* @evt: the type of event
* @ptr: the net device that the event was on
*
* This function is called by the Ethernet driver in case of link
* change event.
*/
static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt,
void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct net *net = dev_net(dev);
struct tipc_net *tn = tipc_net(net);
struct tipc_bearer *b;
int i;
b = rtnl_dereference(dev->tipc_ptr);
if (!b) {
for (i = 0; i < MAX_BEARERS; b = NULL, i++) {
b = rtnl_dereference(tn->bearer_list[i]);
if (b && (b->media_ptr == dev))
break;
}
}
if (!b)
return NOTIFY_DONE;
b->mtu = dev->mtu;
switch (evt) {
case NETDEV_CHANGE:
if (netif_carrier_ok(dev))
break;
case NETDEV_UP:
rcu_assign_pointer(dev->tipc_ptr, b);
break;
case NETDEV_GOING_DOWN:
RCU_INIT_POINTER(dev->tipc_ptr, NULL);
synchronize_net();
tipc_reset_bearer(net, b);
break;
case NETDEV_CHANGEMTU:
tipc_reset_bearer(net, b);
break;
case NETDEV_CHANGEADDR:
b->media->raw2addr(b, &b->addr,
(char *)dev->dev_addr);
tipc_reset_bearer(net, b);
break;
case NETDEV_UNREGISTER:
case NETDEV_CHANGENAME:
bearer_disable(dev_net(dev), b);
break;
}
return NOTIFY_OK;
}
static struct packet_type tipc_packet_type __read_mostly = {
.type = htons(ETH_P_TIPC),
.func = tipc_l2_rcv_msg,
};
static struct notifier_block notifier = {
.notifier_call = tipc_l2_device_event,
.priority = 0,
};
int tipc_bearer_setup(void)
{
int err;
err = register_netdevice_notifier(&notifier);
if (err)
return err;
dev_add_pack(&tipc_packet_type);
return 0;
}
void tipc_bearer_cleanup(void)
{
unregister_netdevice_notifier(&notifier);
dev_remove_pack(&tipc_packet_type);
}
void tipc_bearer_stop(struct net *net)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
b = rtnl_dereference(tn->bearer_list[i]);
if (b) {
bearer_disable(net, b);
tn->bearer_list[i] = NULL;
}
}
}
/* Caller should hold rtnl_lock to protect the bearer */
static int __tipc_nl_add_bearer(struct tipc_nl_msg *msg,
struct tipc_bearer *bearer, int nlflags)
{
void *hdr;
struct nlattr *attrs;
struct nlattr *prop;
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
nlflags, TIPC_NL_BEARER_GET);
if (!hdr)
return -EMSGSIZE;
attrs = nla_nest_start(msg->skb, TIPC_NLA_BEARER);
if (!attrs)
goto msg_full;
if (nla_put_string(msg->skb, TIPC_NLA_BEARER_NAME, bearer->name))
goto attr_msg_full;
prop = nla_nest_start(msg->skb, TIPC_NLA_BEARER_PROP);
if (!prop)
goto prop_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, bearer->priority))
goto prop_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, bearer->tolerance))
goto prop_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, bearer->window))
goto prop_msg_full;
nla_nest_end(msg->skb, prop);
nla_nest_end(msg->skb, attrs);
genlmsg_end(msg->skb, hdr);
return 0;
prop_msg_full:
nla_nest_cancel(msg->skb, prop);
attr_msg_full:
nla_nest_cancel(msg->skb, attrs);
msg_full:
genlmsg_cancel(msg->skb, hdr);
return -EMSGSIZE;
}
int tipc_nl_bearer_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int err;
int i = cb->args[0];
struct tipc_bearer *bearer;
struct tipc_nl_msg msg;
struct net *net = sock_net(skb->sk);
struct tipc_net *tn = net_generic(net, tipc_net_id);
if (i == MAX_BEARERS)
return 0;
msg.skb = skb;
msg.portid = NETLINK_CB(cb->skb).portid;
msg.seq = cb->nlh->nlmsg_seq;
rtnl_lock();
for (i = 0; i < MAX_BEARERS; i++) {
bearer = rtnl_dereference(tn->bearer_list[i]);
if (!bearer)
continue;
err = __tipc_nl_add_bearer(&msg, bearer, NLM_F_MULTI);
if (err)
break;
}
rtnl_unlock();
cb->args[0] = i;
return skb->len;
}
int tipc_nl_bearer_get(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *name;
struct sk_buff *rep;
struct tipc_bearer *bearer;
struct tipc_nl_msg msg;
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
struct net *net = genl_info_net(info);
if (!info->attrs[TIPC_NLA_BEARER])
return -EINVAL;
err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
info->attrs[TIPC_NLA_BEARER],
tipc_nl_bearer_policy);
if (err)
return err;
if (!attrs[TIPC_NLA_BEARER_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!rep)
return -ENOMEM;
msg.skb = rep;
msg.portid = info->snd_portid;
msg.seq = info->snd_seq;
rtnl_lock();
bearer = tipc_bearer_find(net, name);
if (!bearer) {
err = -EINVAL;
goto err_out;
}
err = __tipc_nl_add_bearer(&msg, bearer, 0);
if (err)
goto err_out;
rtnl_unlock();
return genlmsg_reply(rep, info);
err_out:
rtnl_unlock();
nlmsg_free(rep);
return err;
}
int tipc_nl_bearer_disable(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *name;
struct tipc_bearer *bearer;
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
struct net *net = sock_net(skb->sk);
if (!info->attrs[TIPC_NLA_BEARER])
return -EINVAL;
err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
info->attrs[TIPC_NLA_BEARER],
tipc_nl_bearer_policy);
if (err)
return err;
if (!attrs[TIPC_NLA_BEARER_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
rtnl_lock();
bearer = tipc_bearer_find(net, name);
if (!bearer) {
rtnl_unlock();
return -EINVAL;
}
bearer_disable(net, bearer);
rtnl_unlock();
return 0;
}
int tipc_nl_bearer_enable(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *bearer;
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
struct net *net = sock_net(skb->sk);
struct tipc_net *tn = net_generic(net, tipc_net_id);
u32 domain;
u32 prio;
prio = TIPC_MEDIA_LINK_PRI;
domain = tn->own_addr & TIPC_CLUSTER_MASK;
if (!info->attrs[TIPC_NLA_BEARER])
return -EINVAL;
err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
info->attrs[TIPC_NLA_BEARER],
tipc_nl_bearer_policy);
if (err)
return err;
if (!attrs[TIPC_NLA_BEARER_NAME])
return -EINVAL;
bearer = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
if (attrs[TIPC_NLA_BEARER_DOMAIN])
domain = nla_get_u32(attrs[TIPC_NLA_BEARER_DOMAIN]);
if (attrs[TIPC_NLA_BEARER_PROP]) {
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
props);
if (err)
return err;
if (props[TIPC_NLA_PROP_PRIO])
prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
}
rtnl_lock();
err = tipc_enable_bearer(net, bearer, domain, prio, attrs);
if (err) {
rtnl_unlock();
return err;
}
rtnl_unlock();
return 0;
}
int tipc_nl_bearer_set(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *name;
struct tipc_bearer *b;
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
struct net *net = sock_net(skb->sk);
if (!info->attrs[TIPC_NLA_BEARER])
return -EINVAL;
err = nla_parse_nested(attrs, TIPC_NLA_BEARER_MAX,
info->attrs[TIPC_NLA_BEARER],
tipc_nl_bearer_policy);
if (err)
return err;
if (!attrs[TIPC_NLA_BEARER_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_BEARER_NAME]);
rtnl_lock();
b = tipc_bearer_find(net, name);
if (!b) {
rtnl_unlock();
return -EINVAL;
}
if (attrs[TIPC_NLA_BEARER_PROP]) {
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_BEARER_PROP],
props);
if (err) {
rtnl_unlock();
return err;
}
if (props[TIPC_NLA_PROP_TOL])
b->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
if (props[TIPC_NLA_PROP_PRIO])
b->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
if (props[TIPC_NLA_PROP_WIN])
b->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
}
rtnl_unlock();
return 0;
}
static int __tipc_nl_add_media(struct tipc_nl_msg *msg,
struct tipc_media *media, int nlflags)
{
void *hdr;
struct nlattr *attrs;
struct nlattr *prop;
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
nlflags, TIPC_NL_MEDIA_GET);
if (!hdr)
return -EMSGSIZE;
attrs = nla_nest_start(msg->skb, TIPC_NLA_MEDIA);
if (!attrs)
goto msg_full;
if (nla_put_string(msg->skb, TIPC_NLA_MEDIA_NAME, media->name))
goto attr_msg_full;
prop = nla_nest_start(msg->skb, TIPC_NLA_MEDIA_PROP);
if (!prop)
goto prop_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, media->priority))
goto prop_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, media->tolerance))
goto prop_msg_full;
if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN, media->window))
goto prop_msg_full;
nla_nest_end(msg->skb, prop);
nla_nest_end(msg->skb, attrs);
genlmsg_end(msg->skb, hdr);
return 0;
prop_msg_full:
nla_nest_cancel(msg->skb, prop);
attr_msg_full:
nla_nest_cancel(msg->skb, attrs);
msg_full:
genlmsg_cancel(msg->skb, hdr);
return -EMSGSIZE;
}
int tipc_nl_media_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int err;
int i = cb->args[0];
struct tipc_nl_msg msg;
if (i == MAX_MEDIA)
return 0;
msg.skb = skb;
msg.portid = NETLINK_CB(cb->skb).portid;
msg.seq = cb->nlh->nlmsg_seq;
rtnl_lock();
for (; media_info_array[i] != NULL; i++) {
err = __tipc_nl_add_media(&msg, media_info_array[i],
NLM_F_MULTI);
if (err)
break;
}
rtnl_unlock();
cb->args[0] = i;
return skb->len;
}
int tipc_nl_media_get(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *name;
struct tipc_nl_msg msg;
struct tipc_media *media;
struct sk_buff *rep;
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
if (!info->attrs[TIPC_NLA_MEDIA])
return -EINVAL;
err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
info->attrs[TIPC_NLA_MEDIA],
tipc_nl_media_policy);
if (err)
return err;
if (!attrs[TIPC_NLA_MEDIA_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
rep = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
if (!rep)
return -ENOMEM;
msg.skb = rep;
msg.portid = info->snd_portid;
msg.seq = info->snd_seq;
rtnl_lock();
media = tipc_media_find(name);
if (!media) {
err = -EINVAL;
goto err_out;
}
err = __tipc_nl_add_media(&msg, media, 0);
if (err)
goto err_out;
rtnl_unlock();
return genlmsg_reply(rep, info);
err_out:
rtnl_unlock();
nlmsg_free(rep);
return err;
}
int tipc_nl_media_set(struct sk_buff *skb, struct genl_info *info)
{
int err;
char *name;
struct tipc_media *m;
struct nlattr *attrs[TIPC_NLA_BEARER_MAX + 1];
if (!info->attrs[TIPC_NLA_MEDIA])
return -EINVAL;
err = nla_parse_nested(attrs, TIPC_NLA_MEDIA_MAX,
info->attrs[TIPC_NLA_MEDIA],
tipc_nl_media_policy);
if (!attrs[TIPC_NLA_MEDIA_NAME])
return -EINVAL;
name = nla_data(attrs[TIPC_NLA_MEDIA_NAME]);
rtnl_lock();
m = tipc_media_find(name);
if (!m) {
rtnl_unlock();
return -EINVAL;
}
if (attrs[TIPC_NLA_MEDIA_PROP]) {
struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_MEDIA_PROP],
props);
if (err) {
rtnl_unlock();
return err;
}
if (props[TIPC_NLA_PROP_TOL])
m->tolerance = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
if (props[TIPC_NLA_PROP_PRIO])
m->priority = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
if (props[TIPC_NLA_PROP_WIN])
m->window = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
}
rtnl_unlock();
return 0;
}
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