mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Thomas Graf](/assets/img/avatar_default.png)
With decnet converted, we can finally get rid of rta_buf and its computations around it. It also gets rid of the minimal header length verification since all message handlers do that explicitly anyway. Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
312 lines
7.5 KiB
C
312 lines
7.5 KiB
C
/*
|
|
* File: pn_netlink.c
|
|
*
|
|
* Phonet netlink interface
|
|
*
|
|
* Copyright (C) 2008 Nokia Corporation.
|
|
*
|
|
* Authors: Sakari Ailus <sakari.ailus@nokia.com>
|
|
* Remi Denis-Courmont
|
|
*
|
|
* 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.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
|
|
* 02110-1301 USA
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/netlink.h>
|
|
#include <linux/phonet.h>
|
|
#include <linux/slab.h>
|
|
#include <net/sock.h>
|
|
#include <net/phonet/pn_dev.h>
|
|
|
|
/* Device address handling */
|
|
|
|
static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
|
|
u32 portid, u32 seq, int event);
|
|
|
|
void phonet_address_notify(int event, struct net_device *dev, u8 addr)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
|
|
nla_total_size(1), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
err = fill_addr(skb, dev, addr, 0, 0, event);
|
|
if (err < 0) {
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, dev_net(dev), 0,
|
|
RTNLGRP_PHONET_IFADDR, NULL, GFP_KERNEL);
|
|
return;
|
|
errout:
|
|
rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_IFADDR, err);
|
|
}
|
|
|
|
static const struct nla_policy ifa_phonet_policy[IFA_MAX+1] = {
|
|
[IFA_LOCAL] = { .type = NLA_U8 },
|
|
};
|
|
|
|
static int addr_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlattr *tb[IFA_MAX+1];
|
|
struct net_device *dev;
|
|
struct ifaddrmsg *ifm;
|
|
int err;
|
|
u8 pnaddr;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_phonet_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
if (tb[IFA_LOCAL] == NULL)
|
|
return -EINVAL;
|
|
pnaddr = nla_get_u8(tb[IFA_LOCAL]);
|
|
if (pnaddr & 3)
|
|
/* Phonet addresses only have 6 high-order bits */
|
|
return -EINVAL;
|
|
|
|
dev = __dev_get_by_index(net, ifm->ifa_index);
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
if (nlh->nlmsg_type == RTM_NEWADDR)
|
|
err = phonet_address_add(dev, pnaddr);
|
|
else
|
|
err = phonet_address_del(dev, pnaddr);
|
|
if (!err)
|
|
phonet_address_notify(nlh->nlmsg_type, dev, pnaddr);
|
|
return err;
|
|
}
|
|
|
|
static int fill_addr(struct sk_buff *skb, struct net_device *dev, u8 addr,
|
|
u32 portid, u32 seq, int event)
|
|
{
|
|
struct ifaddrmsg *ifm;
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
ifm = nlmsg_data(nlh);
|
|
ifm->ifa_family = AF_PHONET;
|
|
ifm->ifa_prefixlen = 0;
|
|
ifm->ifa_flags = IFA_F_PERMANENT;
|
|
ifm->ifa_scope = RT_SCOPE_LINK;
|
|
ifm->ifa_index = dev->ifindex;
|
|
if (nla_put_u8(skb, IFA_LOCAL, addr))
|
|
goto nla_put_failure;
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int getaddr_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct phonet_device_list *pndevs;
|
|
struct phonet_device *pnd;
|
|
int dev_idx = 0, dev_start_idx = cb->args[0];
|
|
int addr_idx = 0, addr_start_idx = cb->args[1];
|
|
|
|
pndevs = phonet_device_list(sock_net(skb->sk));
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(pnd, &pndevs->list, list) {
|
|
u8 addr;
|
|
|
|
if (dev_idx > dev_start_idx)
|
|
addr_start_idx = 0;
|
|
if (dev_idx++ < dev_start_idx)
|
|
continue;
|
|
|
|
addr_idx = 0;
|
|
for_each_set_bit(addr, pnd->addrs, 64) {
|
|
if (addr_idx++ < addr_start_idx)
|
|
continue;
|
|
|
|
if (fill_addr(skb, pnd->netdev, addr << 2,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, RTM_NEWADDR) < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
cb->args[0] = dev_idx;
|
|
cb->args[1] = addr_idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
/* Routes handling */
|
|
|
|
static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
|
|
u32 portid, u32 seq, int event)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*rtm), 0);
|
|
if (nlh == NULL)
|
|
return -EMSGSIZE;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = AF_PHONET;
|
|
rtm->rtm_dst_len = 6;
|
|
rtm->rtm_src_len = 0;
|
|
rtm->rtm_tos = 0;
|
|
rtm->rtm_table = RT_TABLE_MAIN;
|
|
rtm->rtm_protocol = RTPROT_STATIC;
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
rtm->rtm_type = RTN_UNICAST;
|
|
rtm->rtm_flags = 0;
|
|
if (nla_put_u8(skb, RTA_DST, dst) ||
|
|
nla_put_u32(skb, RTA_OIF, dev->ifindex))
|
|
goto nla_put_failure;
|
|
return nlmsg_end(skb, nlh);
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
void rtm_phonet_notify(int event, struct net_device *dev, u8 dst)
|
|
{
|
|
struct sk_buff *skb;
|
|
int err = -ENOBUFS;
|
|
|
|
skb = nlmsg_new(NLMSG_ALIGN(sizeof(struct ifaddrmsg)) +
|
|
nla_total_size(1) + nla_total_size(4), GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto errout;
|
|
err = fill_route(skb, dev, dst, 0, 0, event);
|
|
if (err < 0) {
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, dev_net(dev), 0,
|
|
RTNLGRP_PHONET_ROUTE, NULL, GFP_KERNEL);
|
|
return;
|
|
errout:
|
|
rtnl_set_sk_err(dev_net(dev), RTNLGRP_PHONET_ROUTE, err);
|
|
}
|
|
|
|
static const struct nla_policy rtm_phonet_policy[RTA_MAX+1] = {
|
|
[RTA_DST] = { .type = NLA_U8 },
|
|
[RTA_OIF] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int route_doit(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
struct net_device *dev;
|
|
struct rtmsg *rtm;
|
|
int err;
|
|
u8 dst;
|
|
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_phonet_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
if (rtm->rtm_table != RT_TABLE_MAIN || rtm->rtm_type != RTN_UNICAST)
|
|
return -EINVAL;
|
|
if (tb[RTA_DST] == NULL || tb[RTA_OIF] == NULL)
|
|
return -EINVAL;
|
|
dst = nla_get_u8(tb[RTA_DST]);
|
|
if (dst & 3) /* Phonet addresses only have 6 high-order bits */
|
|
return -EINVAL;
|
|
|
|
dev = __dev_get_by_index(net, nla_get_u32(tb[RTA_OIF]));
|
|
if (dev == NULL)
|
|
return -ENODEV;
|
|
|
|
if (nlh->nlmsg_type == RTM_NEWROUTE)
|
|
err = phonet_route_add(dev, dst);
|
|
else
|
|
err = phonet_route_del(dev, dst);
|
|
if (!err)
|
|
rtm_phonet_notify(nlh->nlmsg_type, dev, dst);
|
|
return err;
|
|
}
|
|
|
|
static int route_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
u8 addr, addr_idx = 0, addr_start_idx = cb->args[0];
|
|
|
|
rcu_read_lock();
|
|
for (addr = 0; addr < 64; addr++) {
|
|
struct net_device *dev;
|
|
|
|
dev = phonet_route_get_rcu(net, addr << 2);
|
|
if (!dev)
|
|
continue;
|
|
|
|
if (addr_idx++ < addr_start_idx)
|
|
continue;
|
|
if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq, RTM_NEWROUTE))
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
cb->args[0] = addr_idx;
|
|
cb->args[1] = 0;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
int __init phonet_netlink_register(void)
|
|
{
|
|
int err = __rtnl_register(PF_PHONET, RTM_NEWADDR, addr_doit,
|
|
NULL, NULL);
|
|
if (err)
|
|
return err;
|
|
|
|
/* Further __rtnl_register() cannot fail */
|
|
__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL, NULL);
|
|
__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit, NULL);
|
|
__rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL, NULL);
|
|
__rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL, NULL);
|
|
__rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit, NULL);
|
|
return 0;
|
|
}
|