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linux-sg2042/net/tipc/bearer.c

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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"
#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
NULL
};
static const struct nla_policy
tipc_nl_bearer_policy[TIPC_NLA_BEARER_MAX + 1] = {
[TIPC_NLA_BEARER_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_BEARER_NAME] = {
.type = NLA_STRING,
.len = TIPC_MAX_BEARER_NAME
},
[TIPC_NLA_BEARER_PROP] = { .type = NLA_NESTED },
[TIPC_NLA_BEARER_DOMAIN] = { .type = NLA_U32 }
};
static const struct nla_policy tipc_nl_media_policy[TIPC_NLA_MEDIA_MAX + 1] = {
[TIPC_NLA_MEDIA_UNSPEC] = { .type = NLA_UNSPEC },
[TIPC_NLA_MEDIA_NAME] = { .type = NLA_STRING },
[TIPC_NLA_MEDIA_PROP] = { .type = NLA_NESTED }
};
static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
bool shutting_down);
/**
* 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_ptr;
int ret;
m_ptr = media_find_id(a->media_id);
if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
ret = scnprintf(buf, len, "%s(%s)", m_ptr->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_ptr;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
b_ptr = rtnl_dereference(tn->bearer_list[i]);
if (b_ptr && (!strcmp(b_ptr->name, name)))
return b_ptr;
}
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_ptr;
rcu_read_lock();
b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (b_ptr) {
tipc_bcbearer_sort(net, &b_ptr->nodes, dest, true);
tipc_disc_add_dest(b_ptr->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_ptr;
rcu_read_lock();
b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (b_ptr) {
tipc_bcbearer_sort(net, &b_ptr->nodes, dest, false);
tipc_disc_remove_dest(b_ptr->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 tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b_ptr;
struct tipc_media *m_ptr;
struct tipc_bearer_names b_names;
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_ptr = tipc_media_find(b_names.media_name);
if (!m_ptr) {
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_ptr->priority;
restart:
bearer_id = MAX_BEARERS;
with_this_prio = 1;
for (i = MAX_BEARERS; i-- != 0; ) {
b_ptr = rtnl_dereference(tn->bearer_list[i]);
if (!b_ptr) {
bearer_id = i;
continue;
}
if (!strcmp(name, b_ptr->name)) {
pr_warn("Bearer <%s> rejected, already enabled\n",
name);
return -EINVAL;
}
if ((b_ptr->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_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
if (!b_ptr)
return -ENOMEM;
strcpy(b_ptr->name, name);
b_ptr->media = m_ptr;
res = m_ptr->enable_media(net, b_ptr);
if (res) {
pr_warn("Bearer <%s> rejected, enable failure (%d)\n",
name, -res);
return -EINVAL;
}
b_ptr->identity = bearer_id;
b_ptr->tolerance = m_ptr->tolerance;
b_ptr->window = m_ptr->window;
b_ptr->domain = disc_domain;
b_ptr->net_plane = bearer_id + 'A';
b_ptr->priority = priority;
res = tipc_disc_create(net, b_ptr, &b_ptr->bcast_addr);
if (res) {
bearer_disable(net, b_ptr, false);
pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
name);
return -EINVAL;
}
rcu_assign_pointer(tn->bearer_list[bearer_id], b_ptr);
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_ptr)
{
pr_info("Resetting bearer <%s>\n", b_ptr->name);
tipc_link_reset_list(net, b_ptr->identity);
tipc_disc_reset(net, b_ptr);
return 0;
}
/**
* bearer_disable
*
* Note: This routine assumes caller holds RTNL lock.
*/
static void bearer_disable(struct net *net, struct tipc_bearer *b_ptr,
bool shutting_down)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
u32 i;
pr_info("Disabling bearer <%s>\n", b_ptr->name);
b_ptr->media->disable_media(b_ptr);
tipc_link_delete_list(net, b_ptr->identity, shutting_down);
if (b_ptr->link_req)
tipc_disc_delete(b_ptr->link_req);
for (i = 0; i < MAX_BEARERS; i++) {
if (b_ptr == rtnl_dereference(tn->bearer_list[i])) {
RCU_INIT_POINTER(tn->bearer_list[i], NULL);
break;
}
}
kfree_rcu(b_ptr, rcu);
}
int tipc_enable_l2_media(struct net *net, struct tipc_bearer *b)
{
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,
* then get worker thread to complete bearer cleanup. (Can't do cleanup
* here because cleanup code needs to sleep and caller holds spinlocks.)
*/
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(b->media_ptr, NULL);
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
* @buf: the packet to be sent
* @b_ptr: 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 *buf,
struct tipc_bearer *b, struct tipc_media_addr *dest)
{
struct sk_buff *clone;
struct net_device *dev;
int delta;
dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr);
if (!dev)
return 0;
clone = skb_clone(buf, GFP_ATOMIC);
if (!clone)
return 0;
delta = dev->hard_header_len - skb_headroom(buf);
if ((delta > 0) &&
pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) {
kfree_skb(clone);
return 0;
}
skb_reset_network_header(clone);
clone->dev = dev;
clone->protocol = htons(ETH_P_TIPC);
dev_hard_header(clone, dev, ETH_P_TIPC, dest->value,
dev->dev_addr, clone->len);
dev_queue_xmit(clone);
return 0;
}
/* tipc_bearer_send- sends buffer to destination over bearer
*
* IMPORTANT:
* The media send routine must not alter the buffer being passed in
* as it may be needed for later retransmission!
*/
void tipc_bearer_send(struct net *net, u32 bearer_id, struct sk_buff *buf,
struct tipc_media_addr *dest)
{
struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_bearer *b_ptr;
rcu_read_lock();
b_ptr = rcu_dereference_rtnl(tn->bearer_list[bearer_id]);
if (likely(b_ptr))
b_ptr->media->send_msg(net, buf, b_ptr, dest);
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 *buf, struct net_device *dev,
struct packet_type *pt, struct net_device *orig_dev)
{
struct tipc_bearer *b_ptr;
rcu_read_lock();
b_ptr = rcu_dereference_rtnl(dev->tipc_ptr);
if (likely(b_ptr)) {
if (likely(buf->pkt_type <= PACKET_BROADCAST)) {
buf->next = NULL;
tipc_rcv(dev_net(dev), buf, b_ptr);
rcu_read_unlock();
return NET_RX_SUCCESS;
}
}
rcu_read_unlock();
kfree_skb(buf);
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_bearer *b_ptr;
b_ptr = rtnl_dereference(dev->tipc_ptr);
if (!b_ptr)
return NOTIFY_DONE;
b_ptr->mtu = dev->mtu;
switch (evt) {
case NETDEV_CHANGE:
if (netif_carrier_ok(dev))
break;
case NETDEV_DOWN:
case NETDEV_CHANGEMTU:
tipc_reset_bearer(net, b_ptr);
break;
case NETDEV_CHANGEADDR:
b_ptr->media->raw2addr(b_ptr, &b_ptr->addr,
(char *)dev->dev_addr);
tipc_reset_bearer(net, b_ptr);
break;
case NETDEV_UNREGISTER:
case NETDEV_CHANGENAME:
bearer_disable(dev_net(dev), b_ptr, false);
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_ptr;
u32 i;
for (i = 0; i < MAX_BEARERS; i++) {
b_ptr = rtnl_dereference(tn->bearer_list[i]);
if (b_ptr) {
bearer_disable(net, b_ptr, true);
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)
{
void *hdr;
struct nlattr *attrs;
struct nlattr *prop;
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
NLM_F_MULTI, 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);
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);
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, false);
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);
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 = 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]);
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)
{
void *hdr;
struct nlattr *attrs;
struct nlattr *prop;
hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
NLM_F_MULTI, 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]);
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);
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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