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Phonet: routing table Netlink interface

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Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rémi Denis-Courmont 2009-10-14 00:48:29 +00:00 committed by David S. Miller
parent 55748ac046
commit f062f41d06
3 changed files with 162 additions and 0 deletions
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1
include/net/phonet/pn_dev.h
View File

@ -49,6 +49,7 @@ void phonet_address_notify(int event, struct net_device *dev, u8 addr);
int phonet_route_add(struct net_device *dev, u8 daddr);
int phonet_route_del(struct net_device *dev, u8 daddr);
void rtm_phonet_notify(int event, struct net_device *dev, u8 dst);
struct net_device *phonet_route_get(struct net *net, u8 daddr);
struct net_device *phonet_route_output(struct net *net, u8 daddr);

31
net/phonet/pn_dev.c
View File

@ -240,6 +240,27 @@ static int phonet_device_autoconf(struct net_device *dev)
return 0;
}
static void phonet_route_autodel(struct net_device *dev)
{
struct phonet_net *pnn = net_generic(dev_net(dev), phonet_net_id);
unsigned i;
DECLARE_BITMAP(deleted, 64);
/* Remove left-over Phonet routes */
bitmap_zero(deleted, 64);
spin_lock_bh(&pnn->routes.lock);
for (i = 0; i < 64; i++)
if (dev == pnn->routes.table[i]) {
set_bit(i, deleted);
pnn->routes.table[i] = NULL;
dev_put(dev);
}
spin_unlock_bh(&pnn->routes.lock);
for (i = find_first_bit(deleted, 64); i < 64;
i = find_next_bit(deleted, 64, i + 1))
rtm_phonet_notify(RTM_DELROUTE, dev, i);
}
/* notify Phonet of device events */
static int phonet_device_notify(struct notifier_block *me, unsigned long what,
void *arg)
@ -253,6 +274,7 @@ static int phonet_device_notify(struct notifier_block *me, unsigned long what,
break;
case NETDEV_UNREGISTER:
phonet_device_destroy(dev);
phonet_route_autodel(dev);
break;
}
return 0;
@ -287,10 +309,19 @@ static void phonet_exit_net(struct net *net)
{
struct phonet_net *pnn = net_generic(net, phonet_net_id);
struct net_device *dev;
unsigned i;
rtnl_lock();
for_each_netdev(net, dev)
phonet_device_destroy(dev);
for (i = 0; i < 64; i++) {
dev = pnn->routes.table[i];
if (dev) {
rtm_phonet_notify(RTM_DELROUTE, dev, i);
dev_put(dev);
}
}
rtnl_unlock();
proc_net_remove(net, "phonet");

130
net/phonet/pn_netlink.c
View File

@ -29,6 +29,8 @@
#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 pid, u32 seq, int event);
@ -160,6 +162,131 @@ out:
return skb->len;
}
/* Routes handling */
static int fill_route(struct sk_buff *skb, struct net_device *dev, u8 dst,
u32 pid, u32 seq, int event)
{
struct rtmsg *rtm;
struct nlmsghdr *nlh;
nlh = nlmsg_put(skb, pid, 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;
NLA_PUT_U8(skb, RTA_DST, dst);
NLA_PUT_U32(skb, RTA_OIF, dev->ifindex);
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:
if (err < 0)
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, void *attr)
{
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_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];
for (addr = 0; addr < 64; addr++) {
struct net_device *dev;
dev = phonet_route_get(net, addr << 2);
if (!dev)
continue;
if (addr_idx++ < addr_start_idx)
continue;
if (fill_route(skb, dev, addr << 2, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, RTM_NEWROUTE))
goto out;
}
out:
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);
@ -169,5 +296,8 @@ int __init phonet_netlink_register(void)
/* Further __rtnl_register() cannot fail */
__rtnl_register(PF_PHONET, RTM_DELADDR, addr_doit, NULL);
__rtnl_register(PF_PHONET, RTM_GETADDR, NULL, getaddr_dumpit);
__rtnl_register(PF_PHONET, RTM_NEWROUTE, route_doit, NULL);
__rtnl_register(PF_PHONET, RTM_DELROUTE, route_doit, NULL);
__rtnl_register(PF_PHONET, RTM_GETROUTE, NULL, route_dumpit);
return 0;
}