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linux/net/decnet/dn_fib.c
Eric W. Biederman 881d966b48 [NET]: Make the device list and device lookups per namespace. 
This patch makes most of the generic device layer network
namespace safe.  This patch makes dev_base_head a
network namespace variable, and then it picks up
a few associated variables.  The functions:
dev_getbyhwaddr
dev_getfirsthwbytype
dev_get_by_flags
dev_get_by_name
__dev_get_by_name
dev_get_by_index
__dev_get_by_index
dev_ioctl
dev_ethtool
dev_load
wireless_process_ioctl

were modified to take a network namespace argument, and
deal with it.

vlan_ioctl_set and brioctl_set were modified so their
hooks will receive a network namespace argument.

So basically anthing in the core of the network stack that was
affected to by the change of dev_base was modified to handle
multiple network namespaces.  The rest of the network stack was
simply modified to explicitly use &init_net the initial network
namespace.  This can be fixed when those components of the network
stack are modified to handle multiple network namespaces.

For now the ifindex generator is left global.

Fundametally ifindex numbers are per namespace, or else
we will have corner case problems with migration when
we get that far.

At the same time there are assumptions in the network stack
that the ifindex of a network device won't change.  Making
the ifindex number global seems a good compromise until
the network stack can cope with ifindex changes when
you change namespaces, and the like.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-10-10 16:49:10 -07:00

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/*
* DECnet An implementation of the DECnet protocol suite for the LINUX
* operating system. DECnet is implemented using the BSD Socket
* interface as the means of communication with the user level.
*
* DECnet Routing Forwarding Information Base (Glue/Info List)
*
* Author: Steve Whitehouse <SteveW@ACM.org>
*
*
* Changes:
* Alexey Kuznetsov : SMP locking changes
* Steve Whitehouse : Rewrote it... Well to be more correct, I
* copied most of it from the ipv4 fib code.
* Steve Whitehouse : Updated it in style and fixed a few bugs
* which were fixed in the ipv4 code since
* this code was copied from it.
*
*/
#include <linux/string.h>
#include <linux/net.h>
#include <linux/socket.h>
#include <linux/sockios.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <linux/proc_fs.h>
#include <linux/netdevice.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>
#include <asm/uaccess.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/fib_rules.h>
#include <net/dn.h>
#include <net/dn_route.h>
#include <net/dn_fib.h>
#include <net/dn_neigh.h>
#include <net/dn_dev.h>
#define RT_MIN_TABLE 1
#define for_fib_info() { struct dn_fib_info *fi;\
for(fi = dn_fib_info_list; fi; fi = fi->fib_next)
#define endfor_fib_info() }
#define for_nexthops(fi) { int nhsel; const struct dn_fib_nh *nh;\
for(nhsel = 0, nh = (fi)->fib_nh; nhsel < (fi)->fib_nhs; nh++, nhsel++)
#define change_nexthops(fi) { int nhsel; struct dn_fib_nh *nh;\
for(nhsel = 0, nh = (struct dn_fib_nh *)((fi)->fib_nh); nhsel < (fi)->fib_nhs; nh++, nhsel++)
#define endfor_nexthops(fi) }
static DEFINE_SPINLOCK(dn_fib_multipath_lock);
static struct dn_fib_info *dn_fib_info_list;
static DEFINE_SPINLOCK(dn_fib_info_lock);
static struct
{
int error;
u8 scope;
} dn_fib_props[RTN_MAX+1] = {
[RTN_UNSPEC] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
[RTN_UNICAST] = { .error = 0, .scope = RT_SCOPE_UNIVERSE },
[RTN_LOCAL] = { .error = 0, .scope = RT_SCOPE_HOST },
[RTN_BROADCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
[RTN_ANYCAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
[RTN_MULTICAST] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
[RTN_BLACKHOLE] = { .error = -EINVAL, .scope = RT_SCOPE_UNIVERSE },
[RTN_UNREACHABLE] = { .error = -EHOSTUNREACH, .scope = RT_SCOPE_UNIVERSE },
[RTN_PROHIBIT] = { .error = -EACCES, .scope = RT_SCOPE_UNIVERSE },
[RTN_THROW] = { .error = -EAGAIN, .scope = RT_SCOPE_UNIVERSE },
[RTN_NAT] = { .error = 0, .scope = RT_SCOPE_NOWHERE },
[RTN_XRESOLVE] = { .error = -EINVAL, .scope = RT_SCOPE_NOWHERE },
};
static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force);
static int dn_fib_sync_up(struct net_device *dev);
void dn_fib_free_info(struct dn_fib_info *fi)
{
if (fi->fib_dead == 0) {
printk(KERN_DEBUG "DECnet: BUG! Attempt to free alive dn_fib_info\n");
return;
}
change_nexthops(fi) {
if (nh->nh_dev)
dev_put(nh->nh_dev);
nh->nh_dev = NULL;
} endfor_nexthops(fi);
kfree(fi);
}
void dn_fib_release_info(struct dn_fib_info *fi)
{
spin_lock(&dn_fib_info_lock);
if (fi && --fi->fib_treeref == 0) {
if (fi->fib_next)
fi->fib_next->fib_prev = fi->fib_prev;
if (fi->fib_prev)
fi->fib_prev->fib_next = fi->fib_next;
if (fi == dn_fib_info_list)
dn_fib_info_list = fi->fib_next;
fi->fib_dead = 1;
dn_fib_info_put(fi);
}
spin_unlock(&dn_fib_info_lock);
}
static inline int dn_fib_nh_comp(const struct dn_fib_info *fi, const struct dn_fib_info *ofi)
{
const struct dn_fib_nh *onh = ofi->fib_nh;
for_nexthops(fi) {
if (nh->nh_oif != onh->nh_oif ||
nh->nh_gw != onh->nh_gw ||
nh->nh_scope != onh->nh_scope ||
nh->nh_weight != onh->nh_weight ||
((nh->nh_flags^onh->nh_flags)&~RTNH_F_DEAD))
return -1;
onh++;
} endfor_nexthops(fi);
return 0;
}
static inline struct dn_fib_info *dn_fib_find_info(const struct dn_fib_info *nfi)
{
for_fib_info() {
if (fi->fib_nhs != nfi->fib_nhs)
continue;
if (nfi->fib_protocol == fi->fib_protocol &&
nfi->fib_prefsrc == fi->fib_prefsrc &&
nfi->fib_priority == fi->fib_priority &&
memcmp(nfi->fib_metrics, fi->fib_metrics, sizeof(fi->fib_metrics)) == 0 &&
((nfi->fib_flags^fi->fib_flags)&~RTNH_F_DEAD) == 0 &&
(nfi->fib_nhs == 0 || dn_fib_nh_comp(fi, nfi) == 0))
return fi;
} endfor_fib_info();
return NULL;
}
__le16 dn_fib_get_attr16(struct rtattr *attr, int attrlen, int type)
{
while(RTA_OK(attr,attrlen)) {
if (attr->rta_type == type)
return *(__le16*)RTA_DATA(attr);
attr = RTA_NEXT(attr, attrlen);
}
return 0;
}
static int dn_fib_count_nhs(struct rtattr *rta)
{
int nhs = 0;
struct rtnexthop *nhp = RTA_DATA(rta);
int nhlen = RTA_PAYLOAD(rta);
while(nhlen >= (int)sizeof(struct rtnexthop)) {
if ((nhlen -= nhp->rtnh_len) < 0)
return 0;
nhs++;
nhp = RTNH_NEXT(nhp);
}
return nhs;
}
static int dn_fib_get_nhs(struct dn_fib_info *fi, const struct rtattr *rta, const struct rtmsg *r)
{
struct rtnexthop *nhp = RTA_DATA(rta);
int nhlen = RTA_PAYLOAD(rta);
change_nexthops(fi) {
int attrlen = nhlen - sizeof(struct rtnexthop);
if (attrlen < 0 || (nhlen -= nhp->rtnh_len) < 0)
return -EINVAL;
nh->nh_flags = (r->rtm_flags&~0xFF) | nhp->rtnh_flags;
nh->nh_oif = nhp->rtnh_ifindex;
nh->nh_weight = nhp->rtnh_hops + 1;
if (attrlen) {
nh->nh_gw = dn_fib_get_attr16(RTNH_DATA(nhp), attrlen, RTA_GATEWAY);
}
nhp = RTNH_NEXT(nhp);
} endfor_nexthops(fi);
return 0;
}
static int dn_fib_check_nh(const struct rtmsg *r, struct dn_fib_info *fi, struct dn_fib_nh *nh)
{
int err;
if (nh->nh_gw) {
struct flowi fl;
struct dn_fib_res res;
memset(&fl, 0, sizeof(fl));
if (nh->nh_flags&RTNH_F_ONLINK) {
struct net_device *dev;
if (r->rtm_scope >= RT_SCOPE_LINK)
return -EINVAL;
if (dnet_addr_type(nh->nh_gw) != RTN_UNICAST)
return -EINVAL;
if ((dev = __dev_get_by_index(&init_net, nh->nh_oif)) == NULL)
return -ENODEV;
if (!(dev->flags&IFF_UP))
return -ENETDOWN;
nh->nh_dev = dev;
dev_hold(dev);
nh->nh_scope = RT_SCOPE_LINK;
return 0;
}
memset(&fl, 0, sizeof(fl));
fl.fld_dst = nh->nh_gw;
fl.oif = nh->nh_oif;
fl.fld_scope = r->rtm_scope + 1;
if (fl.fld_scope < RT_SCOPE_LINK)
fl.fld_scope = RT_SCOPE_LINK;
if ((err = dn_fib_lookup(&fl, &res)) != 0)
return err;
err = -EINVAL;
if (res.type != RTN_UNICAST && res.type != RTN_LOCAL)
goto out;
nh->nh_scope = res.scope;
nh->nh_oif = DN_FIB_RES_OIF(res);
nh->nh_dev = DN_FIB_RES_DEV(res);
if (nh->nh_dev == NULL)
goto out;
dev_hold(nh->nh_dev);
err = -ENETDOWN;
if (!(nh->nh_dev->flags & IFF_UP))
goto out;
err = 0;
out:
dn_fib_res_put(&res);
return err;
} else {
struct net_device *dev;
if (nh->nh_flags&(RTNH_F_PERVASIVE|RTNH_F_ONLINK))
return -EINVAL;
dev = __dev_get_by_index(&init_net, nh->nh_oif);
if (dev == NULL || dev->dn_ptr == NULL)
return -ENODEV;
if (!(dev->flags&IFF_UP))
return -ENETDOWN;
nh->nh_dev = dev;
dev_hold(nh->nh_dev);
nh->nh_scope = RT_SCOPE_HOST;
}
return 0;
}
struct dn_fib_info *dn_fib_create_info(const struct rtmsg *r, struct dn_kern_rta *rta, const struct nlmsghdr *nlh, int *errp)
{
int err;
struct dn_fib_info *fi = NULL;
struct dn_fib_info *ofi;
int nhs = 1;
if (r->rtm_type > RTN_MAX)
goto err_inval;
if (dn_fib_props[r->rtm_type].scope > r->rtm_scope)
goto err_inval;
if (rta->rta_mp) {
nhs = dn_fib_count_nhs(rta->rta_mp);
if (nhs == 0)
goto err_inval;
}
fi = kzalloc(sizeof(*fi)+nhs*sizeof(struct dn_fib_nh), GFP_KERNEL);
err = -ENOBUFS;
if (fi == NULL)
goto failure;
fi->fib_protocol = r->rtm_protocol;
fi->fib_nhs = nhs;
fi->fib_flags = r->rtm_flags;
if (rta->rta_priority)
fi->fib_priority = *rta->rta_priority;
if (rta->rta_mx) {
int attrlen = RTA_PAYLOAD(rta->rta_mx);
struct rtattr *attr = RTA_DATA(rta->rta_mx);
while(RTA_OK(attr, attrlen)) {
unsigned flavour = attr->rta_type;
if (flavour) {
if (flavour > RTAX_MAX)
goto err_inval;
fi->fib_metrics[flavour-1] = *(unsigned*)RTA_DATA(attr);
}
attr = RTA_NEXT(attr, attrlen);
}
}
if (rta->rta_prefsrc)
memcpy(&fi->fib_prefsrc, rta->rta_prefsrc, 2);
if (rta->rta_mp) {
if ((err = dn_fib_get_nhs(fi, rta->rta_mp, r)) != 0)
goto failure;
if (rta->rta_oif && fi->fib_nh->nh_oif != *rta->rta_oif)
goto err_inval;
if (rta->rta_gw && memcmp(&fi->fib_nh->nh_gw, rta->rta_gw, 2))
goto err_inval;
} else {
struct dn_fib_nh *nh = fi->fib_nh;
if (rta->rta_oif)
nh->nh_oif = *rta->rta_oif;
if (rta->rta_gw)
memcpy(&nh->nh_gw, rta->rta_gw, 2);
nh->nh_flags = r->rtm_flags;
nh->nh_weight = 1;
}
if (r->rtm_type == RTN_NAT) {
if (rta->rta_gw == NULL || nhs != 1 || rta->rta_oif)
goto err_inval;
memcpy(&fi->fib_nh->nh_gw, rta->rta_gw, 2);
goto link_it;
}
if (dn_fib_props[r->rtm_type].error) {
if (rta->rta_gw || rta->rta_oif || rta->rta_mp)
goto err_inval;
goto link_it;
}
if (r->rtm_scope > RT_SCOPE_HOST)
goto err_inval;
if (r->rtm_scope == RT_SCOPE_HOST) {
struct dn_fib_nh *nh = fi->fib_nh;
/* Local address is added */
if (nhs != 1 || nh->nh_gw)
goto err_inval;
nh->nh_scope = RT_SCOPE_NOWHERE;
nh->nh_dev = dev_get_by_index(&init_net, fi->fib_nh->nh_oif);
err = -ENODEV;
if (nh->nh_dev == NULL)
goto failure;
} else {
change_nexthops(fi) {
if ((err = dn_fib_check_nh(r, fi, nh)) != 0)
goto failure;
} endfor_nexthops(fi)
}
if (fi->fib_prefsrc) {
if (r->rtm_type != RTN_LOCAL || rta->rta_dst == NULL ||
memcmp(&fi->fib_prefsrc, rta->rta_dst, 2))
if (dnet_addr_type(fi->fib_prefsrc) != RTN_LOCAL)
goto err_inval;
}
link_it:
if ((ofi = dn_fib_find_info(fi)) != NULL) {
fi->fib_dead = 1;
dn_fib_free_info(fi);
ofi->fib_treeref++;
return ofi;
}
fi->fib_treeref++;
atomic_inc(&fi->fib_clntref);
spin_lock(&dn_fib_info_lock);
fi->fib_next = dn_fib_info_list;
fi->fib_prev = NULL;
if (dn_fib_info_list)
dn_fib_info_list->fib_prev = fi;
dn_fib_info_list = fi;
spin_unlock(&dn_fib_info_lock);
return fi;
err_inval:
err = -EINVAL;
failure:
*errp = err;
if (fi) {
fi->fib_dead = 1;
dn_fib_free_info(fi);
}
return NULL;
}
int dn_fib_semantic_match(int type, struct dn_fib_info *fi, const struct flowi *fl, struct dn_fib_res *res)
{
int err = dn_fib_props[type].error;
if (err == 0) {
if (fi->fib_flags & RTNH_F_DEAD)
return 1;
res->fi = fi;
switch(type) {
case RTN_NAT:
DN_FIB_RES_RESET(*res);
atomic_inc(&fi->fib_clntref);
return 0;
case RTN_UNICAST:
case RTN_LOCAL:
for_nexthops(fi) {
if (nh->nh_flags & RTNH_F_DEAD)
continue;
if (!fl->oif || fl->oif == nh->nh_oif)
break;
}
if (nhsel < fi->fib_nhs) {
res->nh_sel = nhsel;
atomic_inc(&fi->fib_clntref);
return 0;
}
endfor_nexthops(fi);
res->fi = NULL;
return 1;
default:
if (net_ratelimit())
printk("DECnet: impossible routing event : dn_fib_semantic_match type=%d\n", type);
res->fi = NULL;
return -EINVAL;
}
}
return err;
}
void dn_fib_select_multipath(const struct flowi *fl, struct dn_fib_res *res)
{
struct dn_fib_info *fi = res->fi;
int w;
spin_lock_bh(&dn_fib_multipath_lock);
if (fi->fib_power <= 0) {
int power = 0;
change_nexthops(fi) {
if (!(nh->nh_flags&RTNH_F_DEAD)) {
power += nh->nh_weight;
nh->nh_power = nh->nh_weight;
}
} endfor_nexthops(fi);
fi->fib_power = power;
if (power < 0) {
spin_unlock_bh(&dn_fib_multipath_lock);
res->nh_sel = 0;
return;
}
}
w = jiffies % fi->fib_power;
change_nexthops(fi) {
if (!(nh->nh_flags&RTNH_F_DEAD) && nh->nh_power) {
if ((w -= nh->nh_power) <= 0) {
nh->nh_power--;
fi->fib_power--;
res->nh_sel = nhsel;
spin_unlock_bh(&dn_fib_multipath_lock);
return;
}
}
} endfor_nexthops(fi);
res->nh_sel = 0;
spin_unlock_bh(&dn_fib_multipath_lock);
}
static int dn_fib_check_attr(struct rtmsg *r, struct rtattr **rta)
{
int i;
for(i = 1; i <= RTA_MAX; i++) {
struct rtattr *attr = rta[i-1];
if (attr) {
if (RTA_PAYLOAD(attr) < 4 && RTA_PAYLOAD(attr) != 2)
return -EINVAL;
if (i != RTA_MULTIPATH && i != RTA_METRICS &&
i != RTA_TABLE)
rta[i-1] = (struct rtattr *)RTA_DATA(attr);
}
}
return 0;
}
static int dn_fib_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct dn_fib_table *tb;
struct rtattr **rta = arg;
struct rtmsg *r = NLMSG_DATA(nlh);
if (dn_fib_check_attr(r, rta))
return -EINVAL;
tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 0);
if (tb)
return tb->delete(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
return -ESRCH;
}
static int dn_fib_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
{
struct dn_fib_table *tb;
struct rtattr **rta = arg;
struct rtmsg *r = NLMSG_DATA(nlh);
if (dn_fib_check_attr(r, rta))
return -EINVAL;
tb = dn_fib_get_table(rtm_get_table(rta, r->rtm_table), 1);
if (tb)
return tb->insert(tb, r, (struct dn_kern_rta *)rta, nlh, &NETLINK_CB(skb));
return -ENOBUFS;
}
static void fib_magic(int cmd, int type, __le16 dst, int dst_len, struct dn_ifaddr *ifa)
{
struct dn_fib_table *tb;
struct {
struct nlmsghdr nlh;
struct rtmsg rtm;
} req;
struct dn_kern_rta rta;
memset(&req.rtm, 0, sizeof(req.rtm));
memset(&rta, 0, sizeof(rta));
if (type == RTN_UNICAST)
tb = dn_fib_get_table(RT_MIN_TABLE, 1);
else
tb = dn_fib_get_table(RT_TABLE_LOCAL, 1);
if (tb == NULL)
return;
req.nlh.nlmsg_len = sizeof(req);
req.nlh.nlmsg_type = cmd;
req.nlh.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE|NLM_F_APPEND;
req.nlh.nlmsg_pid = 0;
req.nlh.nlmsg_seq = 0;
req.rtm.rtm_dst_len = dst_len;
req.rtm.rtm_table = tb->n;
req.rtm.rtm_protocol = RTPROT_KERNEL;
req.rtm.rtm_scope = (type != RTN_LOCAL ? RT_SCOPE_LINK : RT_SCOPE_HOST);
req.rtm.rtm_type = type;
rta.rta_dst = &dst;
rta.rta_prefsrc = &ifa->ifa_local;
rta.rta_oif = &ifa->ifa_dev->dev->ifindex;
if (cmd == RTM_NEWROUTE)
tb->insert(tb, &req.rtm, &rta, &req.nlh, NULL);
else
tb->delete(tb, &req.rtm, &rta, &req.nlh, NULL);
}
static void dn_fib_add_ifaddr(struct dn_ifaddr *ifa)
{
fib_magic(RTM_NEWROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
#if 0
if (!(dev->flags&IFF_UP))
return;
/* In the future, we will want to add default routes here */
#endif
}
static void dn_fib_del_ifaddr(struct dn_ifaddr *ifa)
{
int found_it = 0;
struct net_device *dev;
struct dn_dev *dn_db;
struct dn_ifaddr *ifa2;
ASSERT_RTNL();
/* Scan device list */
read_lock(&dev_base_lock);
for_each_netdev(&init_net, dev) {
dn_db = dev->dn_ptr;
if (dn_db == NULL)
continue;
for(ifa2 = dn_db->ifa_list; ifa2; ifa2 = ifa2->ifa_next) {
if (ifa2->ifa_local == ifa->ifa_local) {
found_it = 1;
break;
}
}
}
read_unlock(&dev_base_lock);
if (found_it == 0) {
fib_magic(RTM_DELROUTE, RTN_LOCAL, ifa->ifa_local, 16, ifa);
if (dnet_addr_type(ifa->ifa_local) != RTN_LOCAL) {
if (dn_fib_sync_down(ifa->ifa_local, NULL, 0))
dn_fib_flush();
}
}
}
static void dn_fib_disable_addr(struct net_device *dev, int force)
{
if (dn_fib_sync_down(0, dev, force))
dn_fib_flush();
dn_rt_cache_flush(0);
neigh_ifdown(&dn_neigh_table, dev);
}
static int dn_fib_dnaddr_event(struct notifier_block *this, unsigned long event, void *ptr)
{
struct dn_ifaddr *ifa = (struct dn_ifaddr *)ptr;
switch(event) {
case NETDEV_UP:
dn_fib_add_ifaddr(ifa);
dn_fib_sync_up(ifa->ifa_dev->dev);
dn_rt_cache_flush(-1);
break;
case NETDEV_DOWN:
dn_fib_del_ifaddr(ifa);
if (ifa->ifa_dev && ifa->ifa_dev->ifa_list == NULL) {
dn_fib_disable_addr(ifa->ifa_dev->dev, 1);
} else {
dn_rt_cache_flush(-1);
}
break;
}
return NOTIFY_DONE;
}
static int dn_fib_sync_down(__le16 local, struct net_device *dev, int force)
{
int ret = 0;
int scope = RT_SCOPE_NOWHERE;
if (force)
scope = -1;
for_fib_info() {
/*
* This makes no sense for DECnet.... we will almost
* certainly have more than one local address the same
* over all our interfaces. It needs thinking about
* some more.
*/
if (local && fi->fib_prefsrc == local) {
fi->fib_flags |= RTNH_F_DEAD;
ret++;
} else if (dev && fi->fib_nhs) {
int dead = 0;
change_nexthops(fi) {
if (nh->nh_flags&RTNH_F_DEAD)
dead++;
else if (nh->nh_dev == dev &&
nh->nh_scope != scope) {
spin_lock_bh(&dn_fib_multipath_lock);
nh->nh_flags |= RTNH_F_DEAD;
fi->fib_power -= nh->nh_power;
nh->nh_power = 0;
spin_unlock_bh(&dn_fib_multipath_lock);
dead++;
}
} endfor_nexthops(fi)
if (dead == fi->fib_nhs) {
fi->fib_flags |= RTNH_F_DEAD;
ret++;
}
}
} endfor_fib_info();
return ret;
}
static int dn_fib_sync_up(struct net_device *dev)
{
int ret = 0;
if (!(dev->flags&IFF_UP))
return 0;
for_fib_info() {
int alive = 0;
change_nexthops(fi) {
if (!(nh->nh_flags&RTNH_F_DEAD)) {
alive++;
continue;
}
if (nh->nh_dev == NULL || !(nh->nh_dev->flags&IFF_UP))
continue;
if (nh->nh_dev != dev || dev->dn_ptr == NULL)
continue;
alive++;
spin_lock_bh(&dn_fib_multipath_lock);
nh->nh_power = 0;
nh->nh_flags &= ~RTNH_F_DEAD;
spin_unlock_bh(&dn_fib_multipath_lock);
} endfor_nexthops(fi);
if (alive > 0) {
fi->fib_flags &= ~RTNH_F_DEAD;
ret++;
}
} endfor_fib_info();
return ret;
}
static struct notifier_block dn_fib_dnaddr_notifier = {
.notifier_call = dn_fib_dnaddr_event,
};
void __exit dn_fib_cleanup(void)
{
dn_fib_table_cleanup();
dn_fib_rules_cleanup();
unregister_dnaddr_notifier(&dn_fib_dnaddr_notifier);
}
void __init dn_fib_init(void)
{
dn_fib_table_init();
dn_fib_rules_init();
register_dnaddr_notifier(&dn_fib_dnaddr_notifier);
rtnl_register(PF_DECnet, RTM_NEWROUTE, dn_fib_rtm_newroute, NULL);
rtnl_register(PF_DECnet, RTM_DELROUTE, dn_fib_rtm_delroute, NULL);
}
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