427 lines
10 KiB
C
427 lines
10 KiB
C
|
|
/*
|
|
* 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 (Rules)
|
|
*
|
|
* Author: Steve Whitehouse <SteveW@ACM.org>
|
|
* Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c
|
|
*
|
|
*
|
|
* Changes:
|
|
*
|
|
*/
|
|
#include <linux/config.h>
|
|
#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 <linux/in_route.h>
|
|
#include <linux/list.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <asm/atomic.h>
|
|
#include <asm/uaccess.h>
|
|
#include <net/neighbour.h>
|
|
#include <net/dst.h>
|
|
#include <net/flow.h>
|
|
#include <net/dn.h>
|
|
#include <net/dn_fib.h>
|
|
#include <net/dn_neigh.h>
|
|
#include <net/dn_dev.h>
|
|
|
|
struct dn_fib_rule
|
|
{
|
|
struct hlist_node r_hlist;
|
|
atomic_t r_clntref;
|
|
u32 r_preference;
|
|
unsigned char r_table;
|
|
unsigned char r_action;
|
|
unsigned char r_dst_len;
|
|
unsigned char r_src_len;
|
|
__le16 r_src;
|
|
__le16 r_srcmask;
|
|
__le16 r_dst;
|
|
__le16 r_dstmask;
|
|
__le16 r_srcmap;
|
|
u8 r_flags;
|
|
#ifdef CONFIG_DECNET_ROUTE_FWMARK
|
|
u32 r_fwmark;
|
|
#endif
|
|
int r_ifindex;
|
|
char r_ifname[IFNAMSIZ];
|
|
int r_dead;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
static struct dn_fib_rule default_rule = {
|
|
.r_clntref = ATOMIC_INIT(2),
|
|
.r_preference = 0x7fff,
|
|
.r_table = RT_TABLE_MAIN,
|
|
.r_action = RTN_UNICAST
|
|
};
|
|
|
|
static struct hlist_head dn_fib_rules;
|
|
|
|
int dn_fib_rtm_delrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct rtattr **rta = arg;
|
|
struct rtmsg *rtm = NLMSG_DATA(nlh);
|
|
struct dn_fib_rule *r;
|
|
struct hlist_node *node;
|
|
int err = -ESRCH;
|
|
|
|
hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
|
|
if ((!rta[RTA_SRC-1] || memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 2) == 0) &&
|
|
rtm->rtm_src_len == r->r_src_len &&
|
|
rtm->rtm_dst_len == r->r_dst_len &&
|
|
(!rta[RTA_DST-1] || memcmp(RTA_DATA(rta[RTA_DST-1]), &r->r_dst, 2) == 0) &&
|
|
#ifdef CONFIG_DECNET_ROUTE_FWMARK
|
|
(!rta[RTA_PROTOINFO-1] || memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
|
|
#endif
|
|
(!rtm->rtm_type || rtm->rtm_type == r->r_action) &&
|
|
(!rta[RTA_PRIORITY-1] || memcmp(RTA_DATA(rta[RTA_PRIORITY-1]), &r->r_preference, 4) == 0) &&
|
|
(!rta[RTA_IIF-1] || rtattr_strcmp(rta[RTA_IIF-1], r->r_ifname) == 0) &&
|
|
(!rtm->rtm_table || (r && rtm->rtm_table == r->r_table))) {
|
|
|
|
err = -EPERM;
|
|
if (r == &default_rule)
|
|
break;
|
|
|
|
hlist_del_rcu(&r->r_hlist);
|
|
r->r_dead = 1;
|
|
dn_fib_rule_put(r);
|
|
err = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static inline void dn_fib_rule_put_rcu(struct rcu_head *head)
|
|
{
|
|
struct dn_fib_rule *r = container_of(head, struct dn_fib_rule, rcu);
|
|
kfree(r);
|
|
}
|
|
|
|
void dn_fib_rule_put(struct dn_fib_rule *r)
|
|
{
|
|
if (atomic_dec_and_test(&r->r_clntref)) {
|
|
if (r->r_dead)
|
|
call_rcu(&r->rcu, dn_fib_rule_put_rcu);
|
|
else
|
|
printk(KERN_DEBUG "Attempt to free alive dn_fib_rule\n");
|
|
}
|
|
}
|
|
|
|
|
|
int dn_fib_rtm_newrule(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg)
|
|
{
|
|
struct rtattr **rta = arg;
|
|
struct rtmsg *rtm = NLMSG_DATA(nlh);
|
|
struct dn_fib_rule *r, *new_r, *last = NULL;
|
|
struct hlist_node *node = NULL;
|
|
unsigned char table_id;
|
|
|
|
if (rtm->rtm_src_len > 16 || rtm->rtm_dst_len > 16)
|
|
return -EINVAL;
|
|
|
|
if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
|
|
return -EINVAL;
|
|
|
|
if (rtm->rtm_type == RTN_NAT)
|
|
return -EINVAL;
|
|
|
|
table_id = rtm->rtm_table;
|
|
if (table_id == RT_TABLE_UNSPEC) {
|
|
struct dn_fib_table *tb;
|
|
if (rtm->rtm_type == RTN_UNICAST) {
|
|
if ((tb = dn_fib_empty_table()) == NULL)
|
|
return -ENOBUFS;
|
|
table_id = tb->n;
|
|
}
|
|
}
|
|
|
|
new_r = kmalloc(sizeof(*new_r), GFP_KERNEL);
|
|
if (!new_r)
|
|
return -ENOMEM;
|
|
memset(new_r, 0, sizeof(*new_r));
|
|
|
|
if (rta[RTA_SRC-1])
|
|
memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 2);
|
|
if (rta[RTA_DST-1])
|
|
memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 2);
|
|
if (rta[RTA_GATEWAY-1])
|
|
memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 2);
|
|
new_r->r_src_len = rtm->rtm_src_len;
|
|
new_r->r_dst_len = rtm->rtm_dst_len;
|
|
new_r->r_srcmask = dnet_make_mask(rtm->rtm_src_len);
|
|
new_r->r_dstmask = dnet_make_mask(rtm->rtm_dst_len);
|
|
#ifdef CONFIG_DECNET_ROUTE_FWMARK
|
|
if (rta[RTA_PROTOINFO-1])
|
|
memcpy(&new_r->r_fwmark, RTA_DATA(rta[RTA_PROTOINFO-1]), 4);
|
|
#endif
|
|
new_r->r_action = rtm->rtm_type;
|
|
new_r->r_flags = rtm->rtm_flags;
|
|
if (rta[RTA_PRIORITY-1])
|
|
memcpy(&new_r->r_preference, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
|
|
new_r->r_table = table_id;
|
|
if (rta[RTA_IIF-1]) {
|
|
struct net_device *dev;
|
|
rtattr_strlcpy(new_r->r_ifname, rta[RTA_IIF-1], IFNAMSIZ);
|
|
new_r->r_ifindex = -1;
|
|
dev = dev_get_by_name(new_r->r_ifname);
|
|
if (dev) {
|
|
new_r->r_ifindex = dev->ifindex;
|
|
dev_put(dev);
|
|
}
|
|
}
|
|
|
|
r = container_of(dn_fib_rules.first, struct dn_fib_rule, r_hlist);
|
|
if (!new_r->r_preference) {
|
|
if (r && r->r_hlist.next != NULL) {
|
|
r = container_of(r->r_hlist.next, struct dn_fib_rule, r_hlist);
|
|
if (r->r_preference)
|
|
new_r->r_preference = r->r_preference - 1;
|
|
}
|
|
}
|
|
|
|
hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
|
|
if (r->r_preference > new_r->r_preference)
|
|
break;
|
|
last = r;
|
|
}
|
|
atomic_inc(&new_r->r_clntref);
|
|
|
|
if (last)
|
|
hlist_add_after_rcu(&last->r_hlist, &new_r->r_hlist);
|
|
else
|
|
hlist_add_before_rcu(&new_r->r_hlist, &r->r_hlist);
|
|
return 0;
|
|
}
|
|
|
|
|
|
int dn_fib_lookup(const struct flowi *flp, struct dn_fib_res *res)
|
|
{
|
|
struct dn_fib_rule *r, *policy;
|
|
struct dn_fib_table *tb;
|
|
__le16 saddr = flp->fld_src;
|
|
__le16 daddr = flp->fld_dst;
|
|
struct hlist_node *node;
|
|
int err;
|
|
|
|
rcu_read_lock();
|
|
|
|
hlist_for_each_entry_rcu(r, node, &dn_fib_rules, r_hlist) {
|
|
if (((saddr^r->r_src) & r->r_srcmask) ||
|
|
((daddr^r->r_dst) & r->r_dstmask) ||
|
|
#ifdef CONFIG_DECNET_ROUTE_FWMARK
|
|
(r->r_fwmark && r->r_fwmark != flp->fld_fwmark) ||
|
|
#endif
|
|
(r->r_ifindex && r->r_ifindex != flp->iif))
|
|
continue;
|
|
|
|
switch(r->r_action) {
|
|
case RTN_UNICAST:
|
|
case RTN_NAT:
|
|
policy = r;
|
|
break;
|
|
case RTN_UNREACHABLE:
|
|
rcu_read_unlock();
|
|
return -ENETUNREACH;
|
|
default:
|
|
case RTN_BLACKHOLE:
|
|
rcu_read_unlock();
|
|
return -EINVAL;
|
|
case RTN_PROHIBIT:
|
|
rcu_read_unlock();
|
|
return -EACCES;
|
|
}
|
|
|
|
if ((tb = dn_fib_get_table(r->r_table, 0)) == NULL)
|
|
continue;
|
|
err = tb->lookup(tb, flp, res);
|
|
if (err == 0) {
|
|
res->r = policy;
|
|
if (policy)
|
|
atomic_inc(&policy->r_clntref);
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
if (err < 0 && err != -EAGAIN) {
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
return -ESRCH;
|
|
}
|
|
|
|
unsigned dnet_addr_type(__le16 addr)
|
|
{
|
|
struct flowi fl = { .nl_u = { .dn_u = { .daddr = addr } } };
|
|
struct dn_fib_res res;
|
|
unsigned ret = RTN_UNICAST;
|
|
struct dn_fib_table *tb = dn_fib_tables[RT_TABLE_LOCAL];
|
|
|
|
res.r = NULL;
|
|
|
|
if (tb) {
|
|
if (!tb->lookup(tb, &fl, &res)) {
|
|
ret = res.type;
|
|
dn_fib_res_put(&res);
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
__le16 dn_fib_rules_policy(__le16 saddr, struct dn_fib_res *res, unsigned *flags)
|
|
{
|
|
struct dn_fib_rule *r = res->r;
|
|
|
|
if (r->r_action == RTN_NAT) {
|
|
int addrtype = dnet_addr_type(r->r_srcmap);
|
|
|
|
if (addrtype == RTN_NAT) {
|
|
saddr = (saddr&~r->r_srcmask)|r->r_srcmap;
|
|
*flags |= RTCF_SNAT;
|
|
} else if (addrtype == RTN_LOCAL || r->r_srcmap == 0) {
|
|
saddr = r->r_srcmap;
|
|
*flags |= RTCF_MASQ;
|
|
}
|
|
}
|
|
return saddr;
|
|
}
|
|
|
|
static void dn_fib_rules_detach(struct net_device *dev)
|
|
{
|
|
struct hlist_node *node;
|
|
struct dn_fib_rule *r;
|
|
|
|
hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
|
|
if (r->r_ifindex == dev->ifindex)
|
|
r->r_ifindex = -1;
|
|
}
|
|
}
|
|
|
|
static void dn_fib_rules_attach(struct net_device *dev)
|
|
{
|
|
struct hlist_node *node;
|
|
struct dn_fib_rule *r;
|
|
|
|
hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
|
|
if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0)
|
|
r->r_ifindex = dev->ifindex;
|
|
}
|
|
}
|
|
|
|
static int dn_fib_rules_event(struct notifier_block *this, unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = ptr;
|
|
|
|
switch(event) {
|
|
case NETDEV_UNREGISTER:
|
|
dn_fib_rules_detach(dev);
|
|
dn_fib_sync_down(0, dev, 1);
|
|
case NETDEV_REGISTER:
|
|
dn_fib_rules_attach(dev);
|
|
dn_fib_sync_up(dev);
|
|
}
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
|
|
static struct notifier_block dn_fib_rules_notifier = {
|
|
.notifier_call = dn_fib_rules_event,
|
|
};
|
|
|
|
static int dn_fib_fill_rule(struct sk_buff *skb, struct dn_fib_rule *r,
|
|
struct netlink_callback *cb, unsigned int flags)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb->tail;
|
|
|
|
|
|
nlh = NLMSG_NEW_ANSWER(skb, cb, RTM_NEWRULE, sizeof(*rtm), flags);
|
|
rtm = NLMSG_DATA(nlh);
|
|
rtm->rtm_family = AF_DECnet;
|
|
rtm->rtm_dst_len = r->r_dst_len;
|
|
rtm->rtm_src_len = r->r_src_len;
|
|
rtm->rtm_tos = 0;
|
|
#ifdef CONFIG_DECNET_ROUTE_FWMARK
|
|
if (r->r_fwmark)
|
|
RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
|
|
#endif
|
|
rtm->rtm_table = r->r_table;
|
|
rtm->rtm_protocol = 0;
|
|
rtm->rtm_scope = 0;
|
|
rtm->rtm_type = r->r_action;
|
|
rtm->rtm_flags = r->r_flags;
|
|
|
|
if (r->r_dst_len)
|
|
RTA_PUT(skb, RTA_DST, 2, &r->r_dst);
|
|
if (r->r_src_len)
|
|
RTA_PUT(skb, RTA_SRC, 2, &r->r_src);
|
|
if (r->r_ifname[0])
|
|
RTA_PUT(skb, RTA_IIF, IFNAMSIZ, &r->r_ifname);
|
|
if (r->r_preference)
|
|
RTA_PUT(skb, RTA_PRIORITY, 4, &r->r_preference);
|
|
if (r->r_srcmap)
|
|
RTA_PUT(skb, RTA_GATEWAY, 2, &r->r_srcmap);
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
rtattr_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
int dn_fib_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int idx = 0;
|
|
int s_idx = cb->args[0];
|
|
struct dn_fib_rule *r;
|
|
struct hlist_node *node;
|
|
|
|
rcu_read_lock();
|
|
hlist_for_each_entry(r, node, &dn_fib_rules, r_hlist) {
|
|
if (idx < s_idx)
|
|
continue;
|
|
if (dn_fib_fill_rule(skb, r, cb, NLM_F_MULTI) < 0)
|
|
break;
|
|
idx++;
|
|
}
|
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
void __init dn_fib_rules_init(void)
|
|
{
|
|
INIT_HLIST_HEAD(&dn_fib_rules);
|
|
hlist_add_head(&default_rule.r_hlist, &dn_fib_rules);
|
|
register_netdevice_notifier(&dn_fib_rules_notifier);
|
|
}
|
|
|
|
void __exit dn_fib_rules_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(&dn_fib_rules_notifier);
|
|
}
|
|
|
|
|