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linux/net/decnet/dn_dev.c
Eric W. Biederman 90f62cf30a net: Use netlink_ns_capable to verify the permisions of netlink messages 
It is possible by passing a netlink socket to a more privileged
executable and then to fool that executable into writing to the socket
data that happens to be valid netlink message to do something that
privileged executable did not intend to do.

To keep this from happening replace bare capable and ns_capable calls
with netlink_capable, netlink_net_calls and netlink_ns_capable calls.
Which act the same as the previous calls except they verify that the
opener of the socket had the desired permissions as well.

Reported-by: Andy Lutomirski <luto@amacapital.net>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-04-24 13:44:54 -04:00

1445 lines
32 KiB
C
Raw Blame History

/*
* 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 Device Layer
*
* Authors: Steve Whitehouse <SteveW@ACM.org>
* Eduardo Marcelo Serrat <emserrat@geocities.com>
*
* Changes:
* Steve Whitehouse : Devices now see incoming frames so they
* can mark on who it came from.
* Steve Whitehouse : Fixed bug in creating neighbours. Each neighbour
* can now have a device specific setup func.
* Steve Whitehouse : Added /proc/sys/net/decnet/conf/<dev>/
* Steve Whitehouse : Fixed bug which sometimes killed timer
* Steve Whitehouse : Multiple ifaddr support
* Steve Whitehouse : SIOCGIFCONF is now a compile time option
* Steve Whitehouse : /proc/sys/net/decnet/conf/<sys>/forwarding
* Steve Whitehouse : Removed timer1 - it's a user space issue now
* Patrick Caulfield : Fixed router hello message format
* Steve Whitehouse : Got rid of constant sizes for blksize for
* devices. All mtu based now.
*/
#include <linux/capability.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/if_addr.h>
#include <linux/if_arp.h>
#include <linux/if_ether.h>
#include <linux/skbuff.h>
#include <linux/sysctl.h>
#include <linux/notifier.h>
#include <linux/slab.h>
#include <asm/uaccess.h>
#include <net/net_namespace.h>
#include <net/neighbour.h>
#include <net/dst.h>
#include <net/flow.h>
#include <net/fib_rules.h>
#include <net/netlink.h>
#include <net/dn.h>
#include <net/dn_dev.h>
#include <net/dn_route.h>
#include <net/dn_neigh.h>
#include <net/dn_fib.h>
#define DN_IFREQ_SIZE (sizeof(struct ifreq) - sizeof(struct sockaddr) + sizeof(struct sockaddr_dn))
static char dn_rt_all_end_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x04,0x00,0x00};
static char dn_rt_all_rt_mcast[ETH_ALEN] = {0xAB,0x00,0x00,0x03,0x00,0x00};
static char dn_hiord[ETH_ALEN] = {0xAA,0x00,0x04,0x00,0x00,0x00};
static unsigned char dn_eco_version[3] = {0x02,0x00,0x00};
extern struct neigh_table dn_neigh_table;
/*
* decnet_address is kept in network order.
*/
__le16 decnet_address = 0;
static DEFINE_SPINLOCK(dndev_lock);
static struct net_device *decnet_default_device;
static BLOCKING_NOTIFIER_HEAD(dnaddr_chain);
static struct dn_dev *dn_dev_create(struct net_device *dev, int *err);
static void dn_dev_delete(struct net_device *dev);
static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa);
static int dn_eth_up(struct net_device *);
static void dn_eth_down(struct net_device *);
static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa);
static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa);
static struct dn_dev_parms dn_dev_list[] = {
{
.type = ARPHRD_ETHER, /* Ethernet */
.mode = DN_DEV_BCAST,
.state = DN_DEV_S_RU,
.t2 = 1,
.t3 = 10,
.name = "ethernet",
.up = dn_eth_up,
.down = dn_eth_down,
.timer3 = dn_send_brd_hello,
},
{
.type = ARPHRD_IPGRE, /* DECnet tunneled over GRE in IP */
.mode = DN_DEV_BCAST,
.state = DN_DEV_S_RU,
.t2 = 1,
.t3 = 10,
.name = "ipgre",
.timer3 = dn_send_brd_hello,
},
#if 0
{
.type = ARPHRD_X25, /* Bog standard X.25 */
.mode = DN_DEV_UCAST,
.state = DN_DEV_S_DS,
.t2 = 1,
.t3 = 120,
.name = "x25",
.timer3 = dn_send_ptp_hello,
},
#endif
#if 0
{
.type = ARPHRD_PPP, /* DECnet over PPP */
.mode = DN_DEV_BCAST,
.state = DN_DEV_S_RU,
.t2 = 1,
.t3 = 10,
.name = "ppp",
.timer3 = dn_send_brd_hello,
},
#endif
{
.type = ARPHRD_DDCMP, /* DECnet over DDCMP */
.mode = DN_DEV_UCAST,
.state = DN_DEV_S_DS,
.t2 = 1,
.t3 = 120,
.name = "ddcmp",
.timer3 = dn_send_ptp_hello,
},
{
.type = ARPHRD_LOOPBACK, /* Loopback interface - always last */
.mode = DN_DEV_BCAST,
.state = DN_DEV_S_RU,
.t2 = 1,
.t3 = 10,
.name = "loopback",
.timer3 = dn_send_brd_hello,
}
};
#define DN_DEV_LIST_SIZE ARRAY_SIZE(dn_dev_list)
#define DN_DEV_PARMS_OFFSET(x) offsetof(struct dn_dev_parms, x)
#ifdef CONFIG_SYSCTL
static int min_t2[] = { 1 };
static int max_t2[] = { 60 }; /* No max specified, but this seems sensible */
static int min_t3[] = { 1 };
static int max_t3[] = { 8191 }; /* Must fit in 16 bits when multiplied by BCT3MULT or T3MULT */
static int min_priority[1];
static int max_priority[] = { 127 }; /* From DECnet spec */
static int dn_forwarding_proc(struct ctl_table *, int,
void __user *, size_t *, loff_t *);
static struct dn_dev_sysctl_table {
struct ctl_table_header *sysctl_header;
struct ctl_table dn_dev_vars[5];
} dn_dev_sysctl = {
NULL,
{
{
.procname = "forwarding",
.data = (void *)DN_DEV_PARMS_OFFSET(forwarding),
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = dn_forwarding_proc,
},
{
.procname = "priority",
.data = (void *)DN_DEV_PARMS_OFFSET(priority),
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_priority,
.extra2 = &max_priority
},
{
.procname = "t2",
.data = (void *)DN_DEV_PARMS_OFFSET(t2),
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_t2,
.extra2 = &max_t2
},
{
.procname = "t3",
.data = (void *)DN_DEV_PARMS_OFFSET(t3),
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec_minmax,
.extra1 = &min_t3,
.extra2 = &max_t3
},
{0}
},
};
static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
{
struct dn_dev_sysctl_table *t;
int i;
char path[sizeof("net/decnet/conf/") + IFNAMSIZ];
t = kmemdup(&dn_dev_sysctl, sizeof(*t), GFP_KERNEL);
if (t == NULL)
return;
for(i = 0; i < ARRAY_SIZE(t->dn_dev_vars) - 1; i++) {
long offset = (long)t->dn_dev_vars[i].data;
t->dn_dev_vars[i].data = ((char *)parms) + offset;
}
snprintf(path, sizeof(path), "net/decnet/conf/%s",
dev? dev->name : parms->name);
t->dn_dev_vars[0].extra1 = (void *)dev;
t->sysctl_header = register_net_sysctl(&init_net, path, t->dn_dev_vars);
if (t->sysctl_header == NULL)
kfree(t);
else
parms->sysctl = t;
}
static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
{
if (parms->sysctl) {
struct dn_dev_sysctl_table *t = parms->sysctl;
parms->sysctl = NULL;
unregister_net_sysctl_table(t->sysctl_header);
kfree(t);
}
}
static int dn_forwarding_proc(struct ctl_table *table, int write,
void __user *buffer,
size_t *lenp, loff_t *ppos)
{
#ifdef CONFIG_DECNET_ROUTER
struct net_device *dev = table->extra1;
struct dn_dev *dn_db;
int err;
int tmp, old;
if (table->extra1 == NULL)
return -EINVAL;
dn_db = rcu_dereference_raw(dev->dn_ptr);
old = dn_db->parms.forwarding;
err = proc_dointvec(table, write, buffer, lenp, ppos);
if ((err >= 0) && write) {
if (dn_db->parms.forwarding < 0)
dn_db->parms.forwarding = 0;
if (dn_db->parms.forwarding > 2)
dn_db->parms.forwarding = 2;
/*
* What an ugly hack this is... its works, just. It
* would be nice if sysctl/proc were just that little
* bit more flexible so I don't have to write a special
* routine, or suffer hacks like this - SJW
*/
tmp = dn_db->parms.forwarding;
dn_db->parms.forwarding = old;
if (dn_db->parms.down)
dn_db->parms.down(dev);
dn_db->parms.forwarding = tmp;
if (dn_db->parms.up)
dn_db->parms.up(dev);
}
return err;
#else
return -EINVAL;
#endif
}
#else /* CONFIG_SYSCTL */
static void dn_dev_sysctl_unregister(struct dn_dev_parms *parms)
{
}
static void dn_dev_sysctl_register(struct net_device *dev, struct dn_dev_parms *parms)
{
}
#endif /* CONFIG_SYSCTL */
static inline __u16 mtu2blksize(struct net_device *dev)
{
u32 blksize = dev->mtu;
if (blksize > 0xffff)
blksize = 0xffff;
if (dev->type == ARPHRD_ETHER ||
dev->type == ARPHRD_PPP ||
dev->type == ARPHRD_IPGRE ||
dev->type == ARPHRD_LOOPBACK)
blksize -= 2;
return (__u16)blksize;
}
static struct dn_ifaddr *dn_dev_alloc_ifa(void)
{
struct dn_ifaddr *ifa;
ifa = kzalloc(sizeof(*ifa), GFP_KERNEL);
return ifa;
}
static void dn_dev_free_ifa(struct dn_ifaddr *ifa)
{
kfree_rcu(ifa, rcu);
}
static void dn_dev_del_ifa(struct dn_dev *dn_db, struct dn_ifaddr __rcu **ifap, int destroy)
{
struct dn_ifaddr *ifa1 = rtnl_dereference(*ifap);
unsigned char mac_addr[6];
struct net_device *dev = dn_db->dev;
ASSERT_RTNL();
*ifap = ifa1->ifa_next;
if (dn_db->dev->type == ARPHRD_ETHER) {
if (ifa1->ifa_local != dn_eth2dn(dev->dev_addr)) {
dn_dn2eth(mac_addr, ifa1->ifa_local);
dev_mc_del(dev, mac_addr);
}
}
dn_ifaddr_notify(RTM_DELADDR, ifa1);
blocking_notifier_call_chain(&dnaddr_chain, NETDEV_DOWN, ifa1);
if (destroy) {
dn_dev_free_ifa(ifa1);
if (dn_db->ifa_list == NULL)
dn_dev_delete(dn_db->dev);
}
}
static int dn_dev_insert_ifa(struct dn_dev *dn_db, struct dn_ifaddr *ifa)
{
struct net_device *dev = dn_db->dev;
struct dn_ifaddr *ifa1;
unsigned char mac_addr[6];
ASSERT_RTNL();
/* Check for duplicates */
for (ifa1 = rtnl_dereference(dn_db->ifa_list);
ifa1 != NULL;
ifa1 = rtnl_dereference(ifa1->ifa_next)) {
if (ifa1->ifa_local == ifa->ifa_local)
return -EEXIST;
}
if (dev->type == ARPHRD_ETHER) {
if (ifa->ifa_local != dn_eth2dn(dev->dev_addr)) {
dn_dn2eth(mac_addr, ifa->ifa_local);
dev_mc_add(dev, mac_addr);
}
}
ifa->ifa_next = dn_db->ifa_list;
rcu_assign_pointer(dn_db->ifa_list, ifa);
dn_ifaddr_notify(RTM_NEWADDR, ifa);
blocking_notifier_call_chain(&dnaddr_chain, NETDEV_UP, ifa);
return 0;
}
static int dn_dev_set_ifa(struct net_device *dev, struct dn_ifaddr *ifa)
{
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
int rv;
if (dn_db == NULL) {
int err;
dn_db = dn_dev_create(dev, &err);
if (dn_db == NULL)
return err;
}
ifa->ifa_dev = dn_db;
if (dev->flags & IFF_LOOPBACK)
ifa->ifa_scope = RT_SCOPE_HOST;
rv = dn_dev_insert_ifa(dn_db, ifa);
if (rv)
dn_dev_free_ifa(ifa);
return rv;
}
int dn_dev_ioctl(unsigned int cmd, void __user *arg)
{
char buffer[DN_IFREQ_SIZE];
struct ifreq *ifr = (struct ifreq *)buffer;
struct sockaddr_dn *sdn = (struct sockaddr_dn *)&ifr->ifr_addr;
struct dn_dev *dn_db;
struct net_device *dev;
struct dn_ifaddr *ifa = NULL;
struct dn_ifaddr __rcu **ifap = NULL;
int ret = 0;
if (copy_from_user(ifr, arg, DN_IFREQ_SIZE))
return -EFAULT;
ifr->ifr_name[IFNAMSIZ-1] = 0;
dev_load(&init_net, ifr->ifr_name);
switch (cmd) {
case SIOCGIFADDR:
break;
case SIOCSIFADDR:
if (!capable(CAP_NET_ADMIN))
return -EACCES;
if (sdn->sdn_family != AF_DECnet)
return -EINVAL;
break;
default:
return -EINVAL;
}
rtnl_lock();
if ((dev = __dev_get_by_name(&init_net, ifr->ifr_name)) == NULL) {
ret = -ENODEV;
goto done;
}
if ((dn_db = rtnl_dereference(dev->dn_ptr)) != NULL) {
for (ifap = &dn_db->ifa_list;
(ifa = rtnl_dereference(*ifap)) != NULL;
ifap = &ifa->ifa_next)
if (strcmp(ifr->ifr_name, ifa->ifa_label) == 0)
break;
}
if (ifa == NULL && cmd != SIOCSIFADDR) {
ret = -EADDRNOTAVAIL;
goto done;
}
switch (cmd) {
case SIOCGIFADDR:
*((__le16 *)sdn->sdn_nodeaddr) = ifa->ifa_local;
goto rarok;
case SIOCSIFADDR:
if (!ifa) {
if ((ifa = dn_dev_alloc_ifa()) == NULL) {
ret = -ENOBUFS;
break;
}
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
} else {
if (ifa->ifa_local == dn_saddr2dn(sdn))
break;
dn_dev_del_ifa(dn_db, ifap, 0);
}
ifa->ifa_local = ifa->ifa_address = dn_saddr2dn(sdn);
ret = dn_dev_set_ifa(dev, ifa);
}
done:
rtnl_unlock();
return ret;
rarok:
if (copy_to_user(arg, ifr, DN_IFREQ_SIZE))
ret = -EFAULT;
goto done;
}
struct net_device *dn_dev_get_default(void)
{
struct net_device *dev;
spin_lock(&dndev_lock);
dev = decnet_default_device;
if (dev) {
if (dev->dn_ptr)
dev_hold(dev);
else
dev = NULL;
}
spin_unlock(&dndev_lock);
return dev;
}
int dn_dev_set_default(struct net_device *dev, int force)
{
struct net_device *old = NULL;
int rv = -EBUSY;
if (!dev->dn_ptr)
return -ENODEV;
spin_lock(&dndev_lock);
if (force || decnet_default_device == NULL) {
old = decnet_default_device;
decnet_default_device = dev;
rv = 0;
}
spin_unlock(&dndev_lock);
if (old)
dev_put(old);
return rv;
}
static void dn_dev_check_default(struct net_device *dev)
{
spin_lock(&dndev_lock);
if (dev == decnet_default_device) {
decnet_default_device = NULL;
} else {
dev = NULL;
}
spin_unlock(&dndev_lock);
if (dev)
dev_put(dev);
}
/*
* Called with RTNL
*/
static struct dn_dev *dn_dev_by_index(int ifindex)
{
struct net_device *dev;
struct dn_dev *dn_dev = NULL;
dev = __dev_get_by_index(&init_net, ifindex);
if (dev)
dn_dev = rtnl_dereference(dev->dn_ptr);
return dn_dev;
}
static const struct nla_policy dn_ifa_policy[IFA_MAX+1] = {
[IFA_ADDRESS] = { .type = NLA_U16 },
[IFA_LOCAL] = { .type = NLA_U16 },
[IFA_LABEL] = { .type = NLA_STRING,
.len = IFNAMSIZ - 1 },
[IFA_FLAGS] = { .type = NLA_U32 },
};
static int dn_nl_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
{
struct net *net = sock_net(skb->sk);
struct nlattr *tb[IFA_MAX+1];
struct dn_dev *dn_db;
struct ifaddrmsg *ifm;
struct dn_ifaddr *ifa;
struct dn_ifaddr __rcu **ifap;
int err = -EINVAL;
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!net_eq(net, &init_net))
goto errout;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
if (err < 0)
goto errout;
err = -ENODEV;
ifm = nlmsg_data(nlh);
if ((dn_db = dn_dev_by_index(ifm->ifa_index)) == NULL)
goto errout;
err = -EADDRNOTAVAIL;
for (ifap = &dn_db->ifa_list;
(ifa = rtnl_dereference(*ifap)) != NULL;
ifap = &ifa->ifa_next) {
if (tb[IFA_LOCAL] &&
nla_memcmp(tb[IFA_LOCAL], &ifa->ifa_local, 2))
continue;
if (tb[IFA_LABEL] && nla_strcmp(tb[IFA_LABEL], ifa->ifa_label))
continue;
dn_dev_del_ifa(dn_db, ifap, 1);
return 0;
}
errout:
return err;
}
static int dn_nl_newaddr(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 dn_dev *dn_db;
struct ifaddrmsg *ifm;
struct dn_ifaddr *ifa;
int err;
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
if (!net_eq(net, &init_net))
return -EINVAL;
err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, dn_ifa_policy);
if (err < 0)
return err;
if (tb[IFA_LOCAL] == NULL)
return -EINVAL;
ifm = nlmsg_data(nlh);
if ((dev = __dev_get_by_index(&init_net, ifm->ifa_index)) == NULL)
return -ENODEV;
if ((dn_db = rtnl_dereference(dev->dn_ptr)) == NULL) {
dn_db = dn_dev_create(dev, &err);
if (!dn_db)
return err;
}
if ((ifa = dn_dev_alloc_ifa()) == NULL)
return -ENOBUFS;
if (tb[IFA_ADDRESS] == NULL)
tb[IFA_ADDRESS] = tb[IFA_LOCAL];
ifa->ifa_local = nla_get_le16(tb[IFA_LOCAL]);
ifa->ifa_address = nla_get_le16(tb[IFA_ADDRESS]);
ifa->ifa_flags = tb[IFA_FLAGS] ? nla_get_u32(tb[IFA_FLAGS]) :
ifm->ifa_flags;
ifa->ifa_scope = ifm->ifa_scope;
ifa->ifa_dev = dn_db;
if (tb[IFA_LABEL])
nla_strlcpy(ifa->ifa_label, tb[IFA_LABEL], IFNAMSIZ);
else
memcpy(ifa->ifa_label, dev->name, IFNAMSIZ);
err = dn_dev_insert_ifa(dn_db, ifa);
if (err)
dn_dev_free_ifa(ifa);
return err;
}
static inline size_t dn_ifaddr_nlmsg_size(void)
{
return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
+ nla_total_size(IFNAMSIZ) /* IFA_LABEL */
+ nla_total_size(2) /* IFA_ADDRESS */
+ nla_total_size(2) /* IFA_LOCAL */
+ nla_total_size(4); /* IFA_FLAGS */
}
static int dn_nl_fill_ifaddr(struct sk_buff *skb, struct dn_ifaddr *ifa,
u32 portid, u32 seq, int event, unsigned int flags)
{
struct ifaddrmsg *ifm;
struct nlmsghdr *nlh;
u32 ifa_flags = ifa->ifa_flags | IFA_F_PERMANENT;
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*ifm), flags);
if (nlh == NULL)
return -EMSGSIZE;
ifm = nlmsg_data(nlh);
ifm->ifa_family = AF_DECnet;
ifm->ifa_prefixlen = 16;
ifm->ifa_flags = ifa_flags;
ifm->ifa_scope = ifa->ifa_scope;
ifm->ifa_index = ifa->ifa_dev->dev->ifindex;
if ((ifa->ifa_address &&
nla_put_le16(skb, IFA_ADDRESS, ifa->ifa_address)) ||
(ifa->ifa_local &&
nla_put_le16(skb, IFA_LOCAL, ifa->ifa_local)) ||
(ifa->ifa_label[0] &&
nla_put_string(skb, IFA_LABEL, ifa->ifa_label)) ||
nla_put_u32(skb, IFA_FLAGS, ifa_flags))
goto nla_put_failure;
return nlmsg_end(skb, nlh);
nla_put_failure:
nlmsg_cancel(skb, nlh);
return -EMSGSIZE;
}
static void dn_ifaddr_notify(int event, struct dn_ifaddr *ifa)
{
struct sk_buff *skb;
int err = -ENOBUFS;
skb = alloc_skb(dn_ifaddr_nlmsg_size(), GFP_KERNEL);
if (skb == NULL)
goto errout;
err = dn_nl_fill_ifaddr(skb, ifa, 0, 0, event, 0);
if (err < 0) {
/* -EMSGSIZE implies BUG in dn_ifaddr_nlmsg_size() */
WARN_ON(err == -EMSGSIZE);
kfree_skb(skb);
goto errout;
}
rtnl_notify(skb, &init_net, 0, RTNLGRP_DECnet_IFADDR, NULL, GFP_KERNEL);
return;
errout:
if (err < 0)
rtnl_set_sk_err(&init_net, RTNLGRP_DECnet_IFADDR, err);
}
static int dn_nl_dump_ifaddr(struct sk_buff *skb, struct netlink_callback *cb)
{
struct net *net = sock_net(skb->sk);
int idx, dn_idx = 0, skip_ndevs, skip_naddr;
struct net_device *dev;
struct dn_dev *dn_db;
struct dn_ifaddr *ifa;
if (!net_eq(net, &init_net))
return 0;
skip_ndevs = cb->args[0];
skip_naddr = cb->args[1];
idx = 0;
rcu_read_lock();
for_each_netdev_rcu(&init_net, dev) {
if (idx < skip_ndevs)
goto cont;
else if (idx > skip_ndevs) {
/* Only skip over addresses for first dev dumped
* in this iteration (idx == skip_ndevs) */
skip_naddr = 0;
}
if ((dn_db = rcu_dereference(dev->dn_ptr)) == NULL)
goto cont;
for (ifa = rcu_dereference(dn_db->ifa_list), dn_idx = 0; ifa;
ifa = rcu_dereference(ifa->ifa_next), dn_idx++) {
if (dn_idx < skip_naddr)
continue;
if (dn_nl_fill_ifaddr(skb, ifa, NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq, RTM_NEWADDR,
NLM_F_MULTI) < 0)
goto done;
}
cont:
idx++;
}
done:
rcu_read_unlock();
cb->args[0] = idx;
cb->args[1] = dn_idx;
return skb->len;
}
static int dn_dev_get_first(struct net_device *dev, __le16 *addr)
{
struct dn_dev *dn_db;
struct dn_ifaddr *ifa;
int rv = -ENODEV;
rcu_read_lock();
dn_db = rcu_dereference(dev->dn_ptr);
if (dn_db == NULL)
goto out;
ifa = rcu_dereference(dn_db->ifa_list);
if (ifa != NULL) {
*addr = ifa->ifa_local;
rv = 0;
}
out:
rcu_read_unlock();
return rv;
}
/*
* Find a default address to bind to.
*
* This is one of those areas where the initial VMS concepts don't really
* map onto the Linux concepts, and since we introduced multiple addresses
* per interface we have to cope with slightly odd ways of finding out what
* "our address" really is. Mostly it's not a problem; for this we just guess
* a sensible default. Eventually the routing code will take care of all the
* nasties for us I hope.
*/
int dn_dev_bind_default(__le16 *addr)
{
struct net_device *dev;
int rv;
dev = dn_dev_get_default();
last_chance:
if (dev) {
rv = dn_dev_get_first(dev, addr);
dev_put(dev);
if (rv == 0 || dev == init_net.loopback_dev)
return rv;
}
dev = init_net.loopback_dev;
dev_hold(dev);
goto last_chance;
}
static void dn_send_endnode_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
struct endnode_hello_message *msg;
struct sk_buff *skb = NULL;
__le16 *pktlen;
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
if ((skb = dn_alloc_skb(NULL, sizeof(*msg), GFP_ATOMIC)) == NULL)
return;
skb->dev = dev;
msg = (struct endnode_hello_message *)skb_put(skb,sizeof(*msg));
msg->msgflg = 0x0D;
memcpy(msg->tiver, dn_eco_version, 3);
dn_dn2eth(msg->id, ifa->ifa_local);
msg->iinfo = DN_RT_INFO_ENDN;
msg->blksize = cpu_to_le16(mtu2blksize(dev));
msg->area = 0x00;
memset(msg->seed, 0, 8);
memcpy(msg->neighbor, dn_hiord, ETH_ALEN);
if (dn_db->router) {
struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
dn_dn2eth(msg->neighbor, dn->addr);
}
msg->timer = cpu_to_le16((unsigned short)dn_db->parms.t3);
msg->mpd = 0x00;
msg->datalen = 0x02;
memset(msg->data, 0xAA, 2);
pktlen = (__le16 *)skb_push(skb,2);
*pktlen = cpu_to_le16(skb->len - 2);
skb_reset_network_header(skb);
dn_rt_finish_output(skb, dn_rt_all_rt_mcast, msg->id);
}
#define DRDELAY (5 * HZ)
static int dn_am_i_a_router(struct dn_neigh *dn, struct dn_dev *dn_db, struct dn_ifaddr *ifa)
{
/* First check time since device went up */
if ((jiffies - dn_db->uptime) < DRDELAY)
return 0;
/* If there is no router, then yes... */
if (!dn_db->router)
return 1;
/* otherwise only if we have a higher priority or.. */
if (dn->priority < dn_db->parms.priority)
return 1;
/* if we have equal priority and a higher node number */
if (dn->priority != dn_db->parms.priority)
return 0;
if (le16_to_cpu(dn->addr) < le16_to_cpu(ifa->ifa_local))
return 1;
return 0;
}
static void dn_send_router_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
int n;
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
struct dn_neigh *dn = (struct dn_neigh *)dn_db->router;
struct sk_buff *skb;
size_t size;
unsigned char *ptr;
unsigned char *i1, *i2;
__le16 *pktlen;
char *src;
if (mtu2blksize(dev) < (26 + 7))
return;
n = mtu2blksize(dev) - 26;
n /= 7;
if (n > 32)
n = 32;
size = 2 + 26 + 7 * n;
if ((skb = dn_alloc_skb(NULL, size, GFP_ATOMIC)) == NULL)
return;
skb->dev = dev;
ptr = skb_put(skb, size);
*ptr++ = DN_RT_PKT_CNTL | DN_RT_PKT_ERTH;
*ptr++ = 2; /* ECO */
*ptr++ = 0;
*ptr++ = 0;
dn_dn2eth(ptr, ifa->ifa_local);
src = ptr;
ptr += ETH_ALEN;
*ptr++ = dn_db->parms.forwarding == 1 ?
DN_RT_INFO_L1RT : DN_RT_INFO_L2RT;
*((__le16 *)ptr) = cpu_to_le16(mtu2blksize(dev));
ptr += 2;
*ptr++ = dn_db->parms.priority; /* Priority */
*ptr++ = 0; /* Area: Reserved */
*((__le16 *)ptr) = cpu_to_le16((unsigned short)dn_db->parms.t3);
ptr += 2;
*ptr++ = 0; /* MPD: Reserved */
i1 = ptr++;
memset(ptr, 0, 7); /* Name: Reserved */
ptr += 7;
i2 = ptr++;
n = dn_neigh_elist(dev, ptr, n);
*i2 = 7 * n;
*i1 = 8 + *i2;
skb_trim(skb, (27 + *i2));
pktlen = (__le16 *)skb_push(skb, 2);
*pktlen = cpu_to_le16(skb->len - 2);
skb_reset_network_header(skb);
if (dn_am_i_a_router(dn, dn_db, ifa)) {
struct sk_buff *skb2 = skb_copy(skb, GFP_ATOMIC);
if (skb2) {
dn_rt_finish_output(skb2, dn_rt_all_end_mcast, src);
}
}
dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
}
static void dn_send_brd_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
if (dn_db->parms.forwarding == 0)
dn_send_endnode_hello(dev, ifa);
else
dn_send_router_hello(dev, ifa);
}
static void dn_send_ptp_hello(struct net_device *dev, struct dn_ifaddr *ifa)
{
int tdlen = 16;
int size = dev->hard_header_len + 2 + 4 + tdlen;
struct sk_buff *skb = dn_alloc_skb(NULL, size, GFP_ATOMIC);
int i;
unsigned char *ptr;
char src[ETH_ALEN];
if (skb == NULL)
return ;
skb->dev = dev;
skb_push(skb, dev->hard_header_len);
ptr = skb_put(skb, 2 + 4 + tdlen);
*ptr++ = DN_RT_PKT_HELO;
*((__le16 *)ptr) = ifa->ifa_local;
ptr += 2;
*ptr++ = tdlen;
for(i = 0; i < tdlen; i++)
*ptr++ = 0252;
dn_dn2eth(src, ifa->ifa_local);
dn_rt_finish_output(skb, dn_rt_all_rt_mcast, src);
}
static int dn_eth_up(struct net_device *dev)
{
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
if (dn_db->parms.forwarding == 0)
dev_mc_add(dev, dn_rt_all_end_mcast);
else
dev_mc_add(dev, dn_rt_all_rt_mcast);
dn_db->use_long = 1;
return 0;
}
static void dn_eth_down(struct net_device *dev)
{
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
if (dn_db->parms.forwarding == 0)
dev_mc_del(dev, dn_rt_all_end_mcast);
else
dev_mc_del(dev, dn_rt_all_rt_mcast);
}
static void dn_dev_set_timer(struct net_device *dev);
static void dn_dev_timer_func(unsigned long arg)
{
struct net_device *dev = (struct net_device *)arg;
struct dn_dev *dn_db;
struct dn_ifaddr *ifa;
rcu_read_lock();
dn_db = rcu_dereference(dev->dn_ptr);
if (dn_db->t3 <= dn_db->parms.t2) {
if (dn_db->parms.timer3) {
for (ifa = rcu_dereference(dn_db->ifa_list);
ifa;
ifa = rcu_dereference(ifa->ifa_next)) {
if (!(ifa->ifa_flags & IFA_F_SECONDARY))
dn_db->parms.timer3(dev, ifa);
}
}
dn_db->t3 = dn_db->parms.t3;
} else {
dn_db->t3 -= dn_db->parms.t2;
}
rcu_read_unlock();
dn_dev_set_timer(dev);
}
static void dn_dev_set_timer(struct net_device *dev)
{
struct dn_dev *dn_db = rcu_dereference_raw(dev->dn_ptr);
if (dn_db->parms.t2 > dn_db->parms.t3)
dn_db->parms.t2 = dn_db->parms.t3;
dn_db->timer.data = (unsigned long)dev;
dn_db->timer.function = dn_dev_timer_func;
dn_db->timer.expires = jiffies + (dn_db->parms.t2 * HZ);
add_timer(&dn_db->timer);
}
static struct dn_dev *dn_dev_create(struct net_device *dev, int *err)
{
int i;
struct dn_dev_parms *p = dn_dev_list;
struct dn_dev *dn_db;
for(i = 0; i < DN_DEV_LIST_SIZE; i++, p++) {
if (p->type == dev->type)
break;
}
*err = -ENODEV;
if (i == DN_DEV_LIST_SIZE)
return NULL;
*err = -ENOBUFS;
if ((dn_db = kzalloc(sizeof(struct dn_dev), GFP_ATOMIC)) == NULL)
return NULL;
memcpy(&dn_db->parms, p, sizeof(struct dn_dev_parms));
rcu_assign_pointer(dev->dn_ptr, dn_db);
dn_db->dev = dev;
init_timer(&dn_db->timer);
dn_db->uptime = jiffies;
dn_db->neigh_parms = neigh_parms_alloc(dev, &dn_neigh_table);
if (!dn_db->neigh_parms) {
RCU_INIT_POINTER(dev->dn_ptr, NULL);
kfree(dn_db);
return NULL;
}
if (dn_db->parms.up) {
if (dn_db->parms.up(dev) < 0) {
neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
dev->dn_ptr = NULL;
kfree(dn_db);
return NULL;
}
}
dn_dev_sysctl_register(dev, &dn_db->parms);
dn_dev_set_timer(dev);
*err = 0;
return dn_db;
}
/*
* This processes a device up event. We only start up
* the loopback device & ethernet devices with correct
* MAC addresses automatically. Others must be started
* specifically.
*
* FIXME: How should we configure the loopback address ? If we could dispense
* with using decnet_address here and for autobind, it will be one less thing
* for users to worry about setting up.
*/
void dn_dev_up(struct net_device *dev)
{
struct dn_ifaddr *ifa;
__le16 addr = decnet_address;
int maybe_default = 0;
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
return;
/*
* Need to ensure that loopback device has a dn_db attached to it
* to allow creation of neighbours against it, even though it might
* not have a local address of its own. Might as well do the same for
* all autoconfigured interfaces.
*/
if (dn_db == NULL) {
int err;
dn_db = dn_dev_create(dev, &err);
if (dn_db == NULL)
return;
}
if (dev->type == ARPHRD_ETHER) {
if (memcmp(dev->dev_addr, dn_hiord, 4) != 0)
return;
addr = dn_eth2dn(dev->dev_addr);
maybe_default = 1;
}
if (addr == 0)
return;
if ((ifa = dn_dev_alloc_ifa()) == NULL)
return;
ifa->ifa_local = ifa->ifa_address = addr;
ifa->ifa_flags = 0;
ifa->ifa_scope = RT_SCOPE_UNIVERSE;
strcpy(ifa->ifa_label, dev->name);
dn_dev_set_ifa(dev, ifa);
/*
* Automagically set the default device to the first automatically
* configured ethernet card in the system.
*/
if (maybe_default) {
dev_hold(dev);
if (dn_dev_set_default(dev, 0))
dev_put(dev);
}
}
static void dn_dev_delete(struct net_device *dev)
{
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
if (dn_db == NULL)
return;
del_timer_sync(&dn_db->timer);
dn_dev_sysctl_unregister(&dn_db->parms);
dn_dev_check_default(dev);
neigh_ifdown(&dn_neigh_table, dev);
if (dn_db->parms.down)
dn_db->parms.down(dev);
dev->dn_ptr = NULL;
neigh_parms_release(&dn_neigh_table, dn_db->neigh_parms);
neigh_ifdown(&dn_neigh_table, dev);
if (dn_db->router)
neigh_release(dn_db->router);
if (dn_db->peer)
neigh_release(dn_db->peer);
kfree(dn_db);
}
void dn_dev_down(struct net_device *dev)
{
struct dn_dev *dn_db = rtnl_dereference(dev->dn_ptr);
struct dn_ifaddr *ifa;
if (dn_db == NULL)
return;
while ((ifa = rtnl_dereference(dn_db->ifa_list)) != NULL) {
dn_dev_del_ifa(dn_db, &dn_db->ifa_list, 0);
dn_dev_free_ifa(ifa);
}
dn_dev_delete(dev);
}
void dn_dev_init_pkt(struct sk_buff *skb)
{
}
void dn_dev_veri_pkt(struct sk_buff *skb)
{
}
void dn_dev_hello(struct sk_buff *skb)
{
}
void dn_dev_devices_off(void)
{
struct net_device *dev;
rtnl_lock();
for_each_netdev(&init_net, dev)
dn_dev_down(dev);
rtnl_unlock();
}
void dn_dev_devices_on(void)
{
struct net_device *dev;
rtnl_lock();
for_each_netdev(&init_net, dev) {
if (dev->flags & IFF_UP)
dn_dev_up(dev);
}
rtnl_unlock();
}
int register_dnaddr_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&dnaddr_chain, nb);
}
int unregister_dnaddr_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&dnaddr_chain, nb);
}
#ifdef CONFIG_PROC_FS
static inline int is_dn_dev(struct net_device *dev)
{
return dev->dn_ptr != NULL;
}
static void *dn_dev_seq_start(struct seq_file *seq, loff_t *pos)
__acquires(RCU)
{
int i;
struct net_device *dev;
rcu_read_lock();
if (*pos == 0)
return SEQ_START_TOKEN;
i = 1;
for_each_netdev_rcu(&init_net, dev) {
if (!is_dn_dev(dev))
continue;
if (i++ == *pos)
return dev;
}
return NULL;
}
static void *dn_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
struct net_device *dev;
++*pos;
dev = v;
if (v == SEQ_START_TOKEN)
dev = net_device_entry(&init_net.dev_base_head);
for_each_netdev_continue_rcu(&init_net, dev) {
if (!is_dn_dev(dev))
continue;
return dev;
}
return NULL;
}
static void dn_dev_seq_stop(struct seq_file *seq, void *v)
__releases(RCU)
{
rcu_read_unlock();
}
static char *dn_type2asc(char type)
{
switch (type) {
case DN_DEV_BCAST:
return "B";
case DN_DEV_UCAST:
return "U";
case DN_DEV_MPOINT:
return "M";
}
return "?";
}
static int dn_dev_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN)
seq_puts(seq, "Name Flags T1 Timer1 T3 Timer3 BlkSize Pri State DevType Router Peer\n");
else {
struct net_device *dev = v;
char peer_buf[DN_ASCBUF_LEN];
char router_buf[DN_ASCBUF_LEN];
struct dn_dev *dn_db = rcu_dereference(dev->dn_ptr);
seq_printf(seq, "%-8s %1s %04u %04u %04lu %04lu"
" %04hu %03d %02x %-10s %-7s %-7s\n",
dev->name ? dev->name : "???",
dn_type2asc(dn_db->parms.mode),
0, 0,
dn_db->t3, dn_db->parms.t3,
mtu2blksize(dev),
dn_db->parms.priority,
dn_db->parms.state, dn_db->parms.name,
dn_db->router ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->router->primary_key), router_buf) : "",
dn_db->peer ? dn_addr2asc(le16_to_cpu(*(__le16 *)dn_db->peer->primary_key), peer_buf) : "");
}
return 0;
}
static const struct seq_operations dn_dev_seq_ops = {
.start = dn_dev_seq_start,
.next = dn_dev_seq_next,
.stop = dn_dev_seq_stop,
.show = dn_dev_seq_show,
};
static int dn_dev_seq_open(struct inode *inode, struct file *file)
{
return seq_open(file, &dn_dev_seq_ops);
}
static const struct file_operations dn_dev_seq_fops = {
.owner = THIS_MODULE,
.open = dn_dev_seq_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
#endif /* CONFIG_PROC_FS */
static int addr[2];
module_param_array(addr, int, NULL, 0444);
MODULE_PARM_DESC(addr, "The DECnet address of this machine: area,node");
void __init dn_dev_init(void)
{
if (addr[0] > 63 || addr[0] < 0) {
printk(KERN_ERR "DECnet: Area must be between 0 and 63");
return;
}
if (addr[1] > 1023 || addr[1] < 0) {
printk(KERN_ERR "DECnet: Node must be between 0 and 1023");
return;
}
decnet_address = cpu_to_le16((addr[0] << 10) | addr[1]);
dn_dev_devices_on();
rtnl_register(PF_DECnet, RTM_NEWADDR, dn_nl_newaddr, NULL, NULL);
rtnl_register(PF_DECnet, RTM_DELADDR, dn_nl_deladdr, NULL, NULL);
rtnl_register(PF_DECnet, RTM_GETADDR, NULL, dn_nl_dump_ifaddr, NULL);
proc_create("decnet_dev", S_IRUGO, init_net.proc_net, &dn_dev_seq_fops);
#ifdef CONFIG_SYSCTL
{
int i;
for(i = 0; i < DN_DEV_LIST_SIZE; i++)
dn_dev_sysctl_register(NULL, &dn_dev_list[i]);
}
#endif /* CONFIG_SYSCTL */
}
void __exit dn_dev_cleanup(void)
{
#ifdef CONFIG_SYSCTL
{
int i;
for(i = 0; i < DN_DEV_LIST_SIZE; i++)
dn_dev_sysctl_unregister(&dn_dev_list[i]);
}
#endif /* CONFIG_SYSCTL */
remove_proc_entry("decnet_dev", init_net.proc_net);
dn_dev_devices_off();
}
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