mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 05:04:00 +08:00
134e63756d
This makes generic netlink network namespace aware. No generic netlink families except for the controller family are made namespace aware, they need to be checked one by one and then set the family->netnsok member to true. A new function genlmsg_multicast_netns() is introduced to allow sending a multicast message in a given namespace, for example when it applies to an object that lives in that namespace, a new function genlmsg_multicast_allns() to send a message to all network namespaces (for objects that do not have an associated netns). The function genlmsg_multicast() is changed to multicast the message in just init_net, which is currently correct for all generic netlink families since they only work in init_net right now. Some will later want to work in all net namespaces because they do not care about the netns at all -- those will have to be converted to use one of the new functions genlmsg_multicast_allns() or genlmsg_multicast_netns() whenever they are made netns aware in some way. After this patch families can easily decide whether or not they should be available in all net namespaces. Many genl families us it for objects not related to networking and should therefore be available in all namespaces, but that will have to be done on a per family basis. Note that this doesn't touch on the checkpoint/restart problem where network namespaces could be used, genl families and multicast groups are numbered globally and I see no easy way of changing that, especially since it must be possible to multicast to all network namespaces for those families that do not care about netns. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> Signed-off-by: David S. Miller <davem@davemloft.net>
159 lines
3.2 KiB
C
159 lines
3.2 KiB
C
/*
|
|
* IrDA netlink layer, for stack configuration.
|
|
*
|
|
* Copyright (c) 2007 Samuel Ortiz <samuel@sortiz.org>
|
|
*
|
|
* Partly based on the 802.11 nelink implementation
|
|
* (see net/wireless/nl80211.c) which is:
|
|
* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/socket.h>
|
|
#include <linux/irda.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/sock.h>
|
|
#include <net/irda/irda.h>
|
|
#include <net/irda/irlap.h>
|
|
#include <net/genetlink.h>
|
|
|
|
|
|
|
|
static struct genl_family irda_nl_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.name = IRDA_NL_NAME,
|
|
.hdrsize = 0,
|
|
.version = IRDA_NL_VERSION,
|
|
.maxattr = IRDA_NL_CMD_MAX,
|
|
};
|
|
|
|
static struct net_device * ifname_to_netdev(struct net *net, struct genl_info *info)
|
|
{
|
|
char * ifname;
|
|
|
|
if (!info->attrs[IRDA_NL_ATTR_IFNAME])
|
|
return NULL;
|
|
|
|
ifname = nla_data(info->attrs[IRDA_NL_ATTR_IFNAME]);
|
|
|
|
IRDA_DEBUG(5, "%s(): Looking for %s\n", __func__, ifname);
|
|
|
|
return dev_get_by_name(net, ifname);
|
|
}
|
|
|
|
static int irda_nl_set_mode(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net_device * dev;
|
|
struct irlap_cb * irlap;
|
|
u32 mode;
|
|
|
|
if (!info->attrs[IRDA_NL_ATTR_MODE])
|
|
return -EINVAL;
|
|
|
|
mode = nla_get_u32(info->attrs[IRDA_NL_ATTR_MODE]);
|
|
|
|
IRDA_DEBUG(5, "%s(): Switching to mode: %d\n", __func__, mode);
|
|
|
|
dev = ifname_to_netdev(&init_net, info);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
irlap = (struct irlap_cb *)dev->atalk_ptr;
|
|
if (!irlap) {
|
|
dev_put(dev);
|
|
return -ENODEV;
|
|
}
|
|
|
|
irlap->mode = mode;
|
|
|
|
dev_put(dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int irda_nl_get_mode(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct net_device * dev;
|
|
struct irlap_cb * irlap;
|
|
struct sk_buff *msg;
|
|
void *hdr;
|
|
int ret = -ENOBUFS;
|
|
|
|
dev = ifname_to_netdev(&init_net, info);
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg) {
|
|
dev_put(dev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
irlap = (struct irlap_cb *)dev->atalk_ptr;
|
|
if (!irlap) {
|
|
ret = -ENODEV;
|
|
goto err_out;
|
|
}
|
|
|
|
hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq,
|
|
&irda_nl_family, 0, IRDA_NL_CMD_GET_MODE);
|
|
if (hdr == NULL) {
|
|
ret = -EMSGSIZE;
|
|
goto err_out;
|
|
}
|
|
|
|
if(nla_put_string(msg, IRDA_NL_ATTR_IFNAME,
|
|
dev->name))
|
|
goto err_out;
|
|
|
|
if(nla_put_u32(msg, IRDA_NL_ATTR_MODE, irlap->mode))
|
|
goto err_out;
|
|
|
|
genlmsg_end(msg, hdr);
|
|
|
|
return genlmsg_reply(msg, info);
|
|
|
|
err_out:
|
|
nlmsg_free(msg);
|
|
dev_put(dev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct nla_policy irda_nl_policy[IRDA_NL_ATTR_MAX + 1] = {
|
|
[IRDA_NL_ATTR_IFNAME] = { .type = NLA_NUL_STRING,
|
|
.len = IFNAMSIZ-1 },
|
|
[IRDA_NL_ATTR_MODE] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static struct genl_ops irda_nl_ops[] = {
|
|
{
|
|
.cmd = IRDA_NL_CMD_SET_MODE,
|
|
.doit = irda_nl_set_mode,
|
|
.policy = irda_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = IRDA_NL_CMD_GET_MODE,
|
|
.doit = irda_nl_get_mode,
|
|
.policy = irda_nl_policy,
|
|
/* can be retrieved by unprivileged users */
|
|
},
|
|
|
|
};
|
|
|
|
int irda_nl_register(void)
|
|
{
|
|
return genl_register_family_with_ops(&irda_nl_family,
|
|
irda_nl_ops, ARRAY_SIZE(irda_nl_ops));
|
|
}
|
|
|
|
void irda_nl_unregister(void)
|
|
{
|
|
genl_unregister_family(&irda_nl_family);
|
|
}
|