[IPV4]: Use Protocol Independant Policy Routing Rules Framework
Signed-off-by: Thomas Graf <tgraf@suug.ch> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf
David S. Miller
parent
101367c2f8
commit
e1ef4bf23b
|
|
@ -18,6 +18,7 @@
|
|||
|
||||
#include <net/flow.h>
|
||||
#include <linux/seq_file.h>
|
||||
#include <net/fib_rules.h>
|
||||
|
||||
/* WARNING: The ordering of these elements must match ordering
|
||||
* of RTA_* rtnetlink attribute numbers.
|
||||
|
|
@ -203,9 +204,8 @@ static inline void fib_select_default(const struct flowi *flp, struct fib_result
|
|||
#define ip_fib_main_table (fib_tables[RT_TABLE_MAIN])
|
||||
|
||||
extern struct fib_table * fib_tables[RT_TABLE_MAX+1];
|
||||
extern int fib_lookup(const struct flowi *flp, struct fib_result *res);
|
||||
extern int fib_lookup(struct flowi *flp, struct fib_result *res);
|
||||
extern struct fib_table *__fib_new_table(int id);
|
||||
extern void fib_rule_put(struct fib_rule *r);
|
||||
|
||||
static inline struct fib_table *fib_get_table(int id)
|
||||
{
|
||||
|
|
@ -251,15 +251,15 @@ extern u32 __fib_res_prefsrc(struct fib_result *res);
|
|||
extern struct fib_table *fib_hash_init(int id);
|
||||
|
||||
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
||||
/* Exported by fib_rules.c */
|
||||
extern int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb);
|
||||
|
||||
extern void __init fib4_rules_init(void);
|
||||
extern void __exit fib4_rules_cleanup(void);
|
||||
|
||||
extern int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
|
||||
extern int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg);
|
||||
extern int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb);
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
extern u32 fib_rules_tclass(struct fib_result *res);
|
||||
#endif
|
||||
extern void fib_rules_init(void);
|
||||
|
||||
#endif
|
||||
|
||||
static inline void fib_combine_itag(u32 *itag, struct fib_result *res)
|
||||
|
|
|
|||
|
|
@ -88,6 +88,7 @@ config IP_FIB_HASH
|
|||
config IP_MULTIPLE_TABLES
|
||||
bool "IP: policy routing"
|
||||
depends on IP_ADVANCED_ROUTER
|
||||
select FIB_RULES
|
||||
---help---
|
||||
Normally, a router decides what to do with a received packet based
|
||||
solely on the packet's final destination address. If you say Y here,
|
||||
|
|
|
|||
|
|
@ -1151,9 +1151,7 @@ static struct rtnetlink_link inet_rtnetlink_table[RTM_NR_MSGTYPES] = {
|
|||
[RTM_GETROUTE - RTM_BASE] = { .doit = inet_rtm_getroute,
|
||||
.dumpit = inet_dump_fib, },
|
||||
#ifdef CONFIG_IP_MULTIPLE_TABLES
|
||||
[RTM_NEWRULE - RTM_BASE] = { .doit = inet_rtm_newrule, },
|
||||
[RTM_DELRULE - RTM_BASE] = { .doit = inet_rtm_delrule, },
|
||||
[RTM_GETRULE - RTM_BASE] = { .dumpit = inet_dump_rules, },
|
||||
[RTM_GETRULE - RTM_BASE] = { .dumpit = fib4_rules_dump, },
|
||||
#endif
|
||||
};
|
||||
|
||||
|
|
|
|||
|
|
@ -656,7 +656,7 @@ void __init ip_fib_init(void)
|
|||
ip_fib_local_table = fib_hash_init(RT_TABLE_LOCAL);
|
||||
ip_fib_main_table = fib_hash_init(RT_TABLE_MAIN);
|
||||
#else
|
||||
fib_rules_init();
|
||||
fib4_rules_init();
|
||||
#endif
|
||||
|
||||
register_netdevice_notifier(&fib_netdev_notifier);
|
||||
|
|
|
|||
|
|
@ -5,9 +5,8 @@
|
|||
*
|
||||
* IPv4 Forwarding Information Base: policy rules.
|
||||
*
|
||||
* Version: $Id: fib_rules.c,v 1.17 2001/10/31 21:55:54 davem Exp $
|
||||
*
|
||||
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
||||
* Thomas Graf <tgraf@suug.ch>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
|
|
@ -19,129 +18,154 @@
|
|||
* Marc Boucher : routing by fwmark
|
||||
*/
|
||||
|
||||
#include <asm/uaccess.h>
|
||||
#include <asm/system.h>
|
||||
#include <linux/bitops.h>
|
||||
#include <linux/types.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/sched.h>
|
||||
#include <linux/mm.h>
|
||||
#include <linux/string.h>
|
||||
#include <linux/socket.h>
|
||||
#include <linux/sockios.h>
|
||||
#include <linux/errno.h>
|
||||
#include <linux/in.h>
|
||||
#include <linux/inet.h>
|
||||
#include <linux/inetdevice.h>
|
||||
#include <linux/netdevice.h>
|
||||
#include <linux/if_arp.h>
|
||||
#include <linux/proc_fs.h>
|
||||
#include <linux/skbuff.h>
|
||||
#include <linux/netlink.h>
|
||||
#include <linux/inetdevice.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/list.h>
|
||||
#include <linux/rcupdate.h>
|
||||
|
||||
#include <net/ip.h>
|
||||
#include <net/protocol.h>
|
||||
#include <net/route.h>
|
||||
#include <net/tcp.h>
|
||||
#include <net/sock.h>
|
||||
#include <net/ip_fib.h>
|
||||
#include <net/fib_rules.h>
|
||||
|
||||
#define FRprintk(a...)
|
||||
static struct fib_rules_ops fib4_rules_ops;
|
||||
|
||||
struct fib_rule
|
||||
struct fib4_rule
|
||||
{
|
||||
struct hlist_node 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;
|
||||
u32 r_src;
|
||||
u32 r_srcmask;
|
||||
u32 r_dst;
|
||||
u32 r_dstmask;
|
||||
u32 r_srcmap;
|
||||
u8 r_flags;
|
||||
u8 r_tos;
|
||||
struct fib_rule common;
|
||||
u8 dst_len;
|
||||
u8 src_len;
|
||||
u8 tos;
|
||||
u32 src;
|
||||
u32 srcmask;
|
||||
u32 dst;
|
||||
u32 dstmask;
|
||||
#ifdef CONFIG_IP_ROUTE_FWMARK
|
||||
u32 r_fwmark;
|
||||
u32 fwmark;
|
||||
#endif
|
||||
int r_ifindex;
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
__u32 r_tclassid;
|
||||
u32 tclassid;
|
||||
#endif
|
||||
char r_ifname[IFNAMSIZ];
|
||||
int r_dead;
|
||||
struct rcu_head rcu;
|
||||
};
|
||||
|
||||
static struct fib_rule default_rule = {
|
||||
.r_clntref = ATOMIC_INIT(2),
|
||||
.r_preference = 0x7FFF,
|
||||
.r_table = RT_TABLE_DEFAULT,
|
||||
.r_action = RTN_UNICAST,
|
||||
static struct fib4_rule default_rule = {
|
||||
.common = {
|
||||
.refcnt = ATOMIC_INIT(2),
|
||||
.pref = 0x7FFF,
|
||||
.table = RT_TABLE_DEFAULT,
|
||||
.action = FR_ACT_TO_TBL,
|
||||
},
|
||||
};
|
||||
|
||||
static struct fib_rule main_rule = {
|
||||
.r_clntref = ATOMIC_INIT(2),
|
||||
.r_preference = 0x7FFE,
|
||||
.r_table = RT_TABLE_MAIN,
|
||||
.r_action = RTN_UNICAST,
|
||||
static struct fib4_rule main_rule = {
|
||||
.common = {
|
||||
.refcnt = ATOMIC_INIT(2),
|
||||
.pref = 0x7FFE,
|
||||
.table = RT_TABLE_MAIN,
|
||||
.action = FR_ACT_TO_TBL,
|
||||
},
|
||||
};
|
||||
|
||||
static struct fib_rule local_rule = {
|
||||
.r_clntref = ATOMIC_INIT(2),
|
||||
.r_table = RT_TABLE_LOCAL,
|
||||
.r_action = RTN_UNICAST,
|
||||
static struct fib4_rule local_rule = {
|
||||
.common = {
|
||||
.refcnt = ATOMIC_INIT(2),
|
||||
.table = RT_TABLE_LOCAL,
|
||||
.action = FR_ACT_TO_TBL,
|
||||
.flags = FIB_RULE_PERMANENT,
|
||||
},
|
||||
};
|
||||
|
||||
static struct hlist_head fib_rules;
|
||||
static LIST_HEAD(fib4_rules);
|
||||
|
||||
/* writer func called from netlink -- rtnl_sem hold*/
|
||||
|
||||
static void rtmsg_rule(int, struct fib_rule *);
|
||||
|
||||
int inet_rtm_delrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
u32 fib_rules_tclass(struct fib_result *res)
|
||||
{
|
||||
struct rtattr **rta = arg;
|
||||
struct rtmsg *rtm = NLMSG_DATA(nlh);
|
||||
struct fib_rule *r;
|
||||
struct hlist_node *node;
|
||||
int err = -ESRCH;
|
||||
|
||||
hlist_for_each_entry(r, node, &fib_rules, hlist) {
|
||||
if ((!rta[RTA_SRC-1] || memcmp(RTA_DATA(rta[RTA_SRC-1]), &r->r_src, 4) == 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, 4) == 0) &&
|
||||
rtm->rtm_tos == r->r_tos &&
|
||||
#ifdef CONFIG_IP_ROUTE_FWMARK
|
||||
(!rta[RTA_PROTOINFO-1] || memcmp(RTA_DATA(rta[RTA_PROTOINFO-1]), &r->r_fwmark, 4) == 0) &&
|
||||
return res->r ? ((struct fib4_rule *) res->r)->tclassid : 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 == &local_rule)
|
||||
break;
|
||||
|
||||
hlist_del_rcu(&r->hlist);
|
||||
r->r_dead = 1;
|
||||
rtmsg_rule(RTM_DELRULE, r);
|
||||
fib_rule_put(r);
|
||||
err = 0;
|
||||
break;
|
||||
}
|
||||
}
|
||||
int fib_lookup(struct flowi *flp, struct fib_result *res)
|
||||
{
|
||||
struct fib_lookup_arg arg = {
|
||||
.result = res,
|
||||
};
|
||||
int err;
|
||||
|
||||
err = fib_rules_lookup(&fib4_rules_ops, flp, 0, &arg);
|
||||
res->r = arg.rule;
|
||||
|
||||
return err;
|
||||
}
|
||||
|
||||
/* Allocate new unique table id */
|
||||
int fib4_rule_action(struct fib_rule *rule, struct flowi *flp, int flags,
|
||||
struct fib_lookup_arg *arg)
|
||||
{
|
||||
int err = -EAGAIN;
|
||||
struct fib_table *tbl;
|
||||
|
||||
switch (rule->action) {
|
||||
case FR_ACT_TO_TBL:
|
||||
break;
|
||||
|
||||
case FR_ACT_UNREACHABLE:
|
||||
err = -ENETUNREACH;
|
||||
goto errout;
|
||||
|
||||
case FR_ACT_PROHIBIT:
|
||||
err = -EACCES;
|
||||
goto errout;
|
||||
|
||||
case FR_ACT_BLACKHOLE:
|
||||
default:
|
||||
err = -EINVAL;
|
||||
goto errout;
|
||||
}
|
||||
|
||||
if ((tbl = fib_get_table(rule->table)) == NULL)
|
||||
goto errout;
|
||||
|
||||
err = tbl->tb_lookup(tbl, flp, (struct fib_result *) arg->result);
|
||||
if (err > 0)
|
||||
err = -EAGAIN;
|
||||
errout:
|
||||
return err;
|
||||
}
|
||||
|
||||
|
||||
void fib_select_default(const struct flowi *flp, struct fib_result *res)
|
||||
{
|
||||
if (res->r && res->r->action == FR_ACT_TO_TBL &&
|
||||
FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) {
|
||||
struct fib_table *tb;
|
||||
if ((tb = fib_get_table(res->r->table)) != NULL)
|
||||
tb->tb_select_default(tb, flp, res);
|
||||
}
|
||||
}
|
||||
|
||||
static int fib4_rule_match(struct fib_rule *rule, struct flowi *fl, int flags)
|
||||
{
|
||||
struct fib4_rule *r = (struct fib4_rule *) rule;
|
||||
u32 daddr = fl->fl4_dst;
|
||||
u32 saddr = fl->fl4_src;
|
||||
|
||||
if (((saddr ^ r->src) & r->srcmask) ||
|
||||
((daddr ^ r->dst) & r->dstmask))
|
||||
return 0;
|
||||
|
||||
if (r->tos && (r->tos != fl->fl4_tos))
|
||||
return 0;
|
||||
|
||||
#ifdef CONFIG_IP_ROUTE_FWMARK
|
||||
if (r->fwmark && (r->fwmark != fl->fl4_fwmark))
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static struct fib_table *fib_empty_table(void)
|
||||
{
|
||||
|
|
@ -153,329 +177,178 @@ static struct fib_table *fib_empty_table(void)
|
|||
return NULL;
|
||||
}
|
||||
|
||||
static inline void fib_rule_put_rcu(struct rcu_head *head)
|
||||
{
|
||||
struct fib_rule *r = container_of(head, struct fib_rule, rcu);
|
||||
kfree(r);
|
||||
}
|
||||
|
||||
void fib_rule_put(struct fib_rule *r)
|
||||
{
|
||||
if (atomic_dec_and_test(&r->r_clntref)) {
|
||||
if (r->r_dead)
|
||||
call_rcu(&r->rcu, fib_rule_put_rcu);
|
||||
else
|
||||
printk("Freeing alive rule %p\n", r);
|
||||
}
|
||||
}
|
||||
|
||||
/* writer func called from netlink -- rtnl_sem hold*/
|
||||
|
||||
int inet_rtm_newrule(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
||||
{
|
||||
struct rtattr **rta = arg;
|
||||
struct rtmsg *rtm = NLMSG_DATA(nlh);
|
||||
struct fib_rule *r, *new_r, *last = NULL;
|
||||
struct hlist_node *node = NULL;
|
||||
unsigned char table_id;
|
||||
|
||||
if (rtm->rtm_src_len > 32 || rtm->rtm_dst_len > 32 ||
|
||||
(rtm->rtm_tos & ~IPTOS_TOS_MASK))
|
||||
return -EINVAL;
|
||||
|
||||
if (rta[RTA_IIF-1] && RTA_PAYLOAD(rta[RTA_IIF-1]) > IFNAMSIZ)
|
||||
return -EINVAL;
|
||||
|
||||
table_id = rtm->rtm_table;
|
||||
if (table_id == RT_TABLE_UNSPEC) {
|
||||
struct fib_table *table;
|
||||
if (rtm->rtm_type == RTN_UNICAST) {
|
||||
if ((table = fib_empty_table()) == NULL)
|
||||
return -ENOBUFS;
|
||||
table_id = table->tb_id;
|
||||
}
|
||||
}
|
||||
|
||||
new_r = kzalloc(sizeof(*new_r), GFP_KERNEL);
|
||||
if (!new_r)
|
||||
return -ENOMEM;
|
||||
|
||||
if (rta[RTA_SRC-1])
|
||||
memcpy(&new_r->r_src, RTA_DATA(rta[RTA_SRC-1]), 4);
|
||||
if (rta[RTA_DST-1])
|
||||
memcpy(&new_r->r_dst, RTA_DATA(rta[RTA_DST-1]), 4);
|
||||
if (rta[RTA_GATEWAY-1])
|
||||
memcpy(&new_r->r_srcmap, RTA_DATA(rta[RTA_GATEWAY-1]), 4);
|
||||
new_r->r_src_len = rtm->rtm_src_len;
|
||||
new_r->r_dst_len = rtm->rtm_dst_len;
|
||||
new_r->r_srcmask = inet_make_mask(rtm->rtm_src_len);
|
||||
new_r->r_dstmask = inet_make_mask(rtm->rtm_dst_len);
|
||||
new_r->r_tos = rtm->rtm_tos;
|
||||
#ifdef CONFIG_IP_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;
|
||||
}
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
if (rta[RTA_FLOW-1])
|
||||
memcpy(&new_r->r_tclassid, RTA_DATA(rta[RTA_FLOW-1]), 4);
|
||||
#endif
|
||||
r = container_of(fib_rules.first, struct fib_rule, hlist);
|
||||
|
||||
if (!new_r->r_preference) {
|
||||
if (r && r->hlist.next != NULL) {
|
||||
r = container_of(r->hlist.next, struct fib_rule, hlist);
|
||||
if (r->r_preference)
|
||||
new_r->r_preference = r->r_preference - 1;
|
||||
}
|
||||
}
|
||||
|
||||
hlist_for_each_entry(r, node, &fib_rules, 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->hlist, &new_r->hlist);
|
||||
else
|
||||
hlist_add_before_rcu(&new_r->hlist, &r->hlist);
|
||||
|
||||
rtmsg_rule(RTM_NEWRULE, new_r);
|
||||
return 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
u32 fib_rules_tclass(struct fib_result *res)
|
||||
{
|
||||
if (res->r)
|
||||
return res->r->r_tclassid;
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* callers should hold rtnl semaphore */
|
||||
|
||||
static void fib_rules_detach(struct net_device *dev)
|
||||
{
|
||||
struct hlist_node *node;
|
||||
struct fib_rule *r;
|
||||
|
||||
hlist_for_each_entry(r, node, &fib_rules, hlist) {
|
||||
if (r->r_ifindex == dev->ifindex)
|
||||
r->r_ifindex = -1;
|
||||
|
||||
}
|
||||
}
|
||||
|
||||
/* callers should hold rtnl semaphore */
|
||||
|
||||
static void fib_rules_attach(struct net_device *dev)
|
||||
{
|
||||
struct hlist_node *node;
|
||||
struct fib_rule *r;
|
||||
|
||||
hlist_for_each_entry(r, node, &fib_rules, hlist) {
|
||||
if (r->r_ifindex == -1 && strcmp(dev->name, r->r_ifname) == 0)
|
||||
r->r_ifindex = dev->ifindex;
|
||||
}
|
||||
}
|
||||
|
||||
int fib_lookup(const struct flowi *flp, struct fib_result *res)
|
||||
{
|
||||
int err;
|
||||
struct fib_rule *r, *policy;
|
||||
struct fib_table *tb;
|
||||
struct hlist_node *node;
|
||||
|
||||
u32 daddr = flp->fl4_dst;
|
||||
u32 saddr = flp->fl4_src;
|
||||
|
||||
FRprintk("Lookup: %u.%u.%u.%u <- %u.%u.%u.%u ",
|
||||
NIPQUAD(flp->fl4_dst), NIPQUAD(flp->fl4_src));
|
||||
|
||||
rcu_read_lock();
|
||||
|
||||
hlist_for_each_entry_rcu(r, node, &fib_rules, hlist) {
|
||||
if (((saddr^r->r_src) & r->r_srcmask) ||
|
||||
((daddr^r->r_dst) & r->r_dstmask) ||
|
||||
(r->r_tos && r->r_tos != flp->fl4_tos) ||
|
||||
#ifdef CONFIG_IP_ROUTE_FWMARK
|
||||
(r->r_fwmark && r->r_fwmark != flp->fl4_fwmark) ||
|
||||
#endif
|
||||
(r->r_ifindex && r->r_ifindex != flp->iif))
|
||||
continue;
|
||||
|
||||
FRprintk("tb %d r %d ", r->r_table, r->r_action);
|
||||
switch (r->r_action) {
|
||||
case RTN_UNICAST:
|
||||
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 = fib_get_table(r->r_table)) == NULL)
|
||||
continue;
|
||||
err = tb->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;
|
||||
}
|
||||
}
|
||||
FRprintk("FAILURE\n");
|
||||
rcu_read_unlock();
|
||||
return -ENETUNREACH;
|
||||
}
|
||||
|
||||
void fib_select_default(const struct flowi *flp, struct fib_result *res)
|
||||
{
|
||||
if (res->r && res->r->r_action == RTN_UNICAST &&
|
||||
FIB_RES_GW(*res) && FIB_RES_NH(*res).nh_scope == RT_SCOPE_LINK) {
|
||||
struct fib_table *tb;
|
||||
if ((tb = fib_get_table(res->r->r_table)) != NULL)
|
||||
tb->tb_select_default(tb, flp, res);
|
||||
}
|
||||
}
|
||||
|
||||
static int fib_rules_event(struct notifier_block *this, unsigned long event, void *ptr)
|
||||
{
|
||||
struct net_device *dev = ptr;
|
||||
|
||||
if (event == NETDEV_UNREGISTER)
|
||||
fib_rules_detach(dev);
|
||||
else if (event == NETDEV_REGISTER)
|
||||
fib_rules_attach(dev);
|
||||
return NOTIFY_DONE;
|
||||
}
|
||||
|
||||
|
||||
static struct notifier_block fib_rules_notifier = {
|
||||
.notifier_call =fib_rules_event,
|
||||
static struct nla_policy fib4_rule_policy[FRA_MAX+1] __read_mostly = {
|
||||
[FRA_IFNAME] = { .type = NLA_STRING },
|
||||
[FRA_PRIORITY] = { .type = NLA_U32 },
|
||||
[FRA_SRC] = { .type = NLA_U32 },
|
||||
[FRA_DST] = { .type = NLA_U32 },
|
||||
[FRA_FWMARK] = { .type = NLA_U32 },
|
||||
[FRA_FLOW] = { .type = NLA_U32 },
|
||||
};
|
||||
|
||||
static __inline__ int inet_fill_rule(struct sk_buff *skb,
|
||||
struct fib_rule *r,
|
||||
u32 pid, u32 seq, int event,
|
||||
unsigned int flags)
|
||||
static int fib4_rule_configure(struct fib_rule *rule, struct sk_buff *skb,
|
||||
struct nlmsghdr *nlh, struct fib_rule_hdr *frh,
|
||||
struct nlattr **tb)
|
||||
{
|
||||
struct rtmsg *rtm;
|
||||
struct nlmsghdr *nlh;
|
||||
unsigned char *b = skb->tail;
|
||||
int err = -EINVAL;
|
||||
struct fib4_rule *rule4 = (struct fib4_rule *) rule;
|
||||
|
||||
if (frh->src_len > 32 || frh->dst_len > 32 ||
|
||||
(frh->tos & ~IPTOS_TOS_MASK))
|
||||
goto errout;
|
||||
|
||||
if (rule->table == RT_TABLE_UNSPEC) {
|
||||
if (rule->action == FR_ACT_TO_TBL) {
|
||||
struct fib_table *table;
|
||||
|
||||
table = fib_empty_table();
|
||||
if (table == NULL) {
|
||||
err = -ENOBUFS;
|
||||
goto errout;
|
||||
}
|
||||
|
||||
rule->table = table->tb_id;
|
||||
}
|
||||
}
|
||||
|
||||
if (tb[FRA_SRC])
|
||||
rule4->src = nla_get_u32(tb[FRA_SRC]);
|
||||
|
||||
if (tb[FRA_DST])
|
||||
rule4->dst = nla_get_u32(tb[FRA_DST]);
|
||||
|
||||
nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*rtm), flags);
|
||||
rtm = NLMSG_DATA(nlh);
|
||||
rtm->rtm_family = AF_INET;
|
||||
rtm->rtm_dst_len = r->r_dst_len;
|
||||
rtm->rtm_src_len = r->r_src_len;
|
||||
rtm->rtm_tos = r->r_tos;
|
||||
#ifdef CONFIG_IP_ROUTE_FWMARK
|
||||
if (r->r_fwmark)
|
||||
RTA_PUT(skb, RTA_PROTOINFO, 4, &r->r_fwmark);
|
||||
if (tb[FRA_FWMARK])
|
||||
rule4->fwmark = nla_get_u32(tb[FRA_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, 4, &r->r_dst);
|
||||
if (r->r_src_len)
|
||||
RTA_PUT(skb, RTA_SRC, 4, &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, 4, &r->r_srcmap);
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
if (r->r_tclassid)
|
||||
RTA_PUT(skb, RTA_FLOW, 4, &r->r_tclassid);
|
||||
if (tb[FRA_FLOW])
|
||||
rule4->tclassid = nla_get_u32(tb[FRA_FLOW]);
|
||||
#endif
|
||||
nlh->nlmsg_len = skb->tail - b;
|
||||
return skb->len;
|
||||
|
||||
nlmsg_failure:
|
||||
rtattr_failure:
|
||||
skb_trim(skb, b - skb->data);
|
||||
return -1;
|
||||
rule4->src_len = frh->src_len;
|
||||
rule4->srcmask = inet_make_mask(rule4->src_len);
|
||||
rule4->dst_len = frh->dst_len;
|
||||
rule4->dstmask = inet_make_mask(rule4->dst_len);
|
||||
rule4->tos = frh->tos;
|
||||
|
||||
err = 0;
|
||||
errout:
|
||||
return err;
|
||||
}
|
||||
|
||||
/* callers should hold rtnl semaphore */
|
||||
|
||||
static void rtmsg_rule(int event, struct fib_rule *r)
|
||||
static int fib4_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh,
|
||||
struct nlattr **tb)
|
||||
{
|
||||
int size = NLMSG_SPACE(sizeof(struct rtmsg) + 128);
|
||||
struct sk_buff *skb = alloc_skb(size, GFP_KERNEL);
|
||||
struct fib4_rule *rule4 = (struct fib4_rule *) rule;
|
||||
|
||||
if (!skb)
|
||||
netlink_set_err(rtnl, 0, RTNLGRP_IPV4_RULE, ENOBUFS);
|
||||
else if (inet_fill_rule(skb, r, 0, 0, event, 0) < 0) {
|
||||
kfree_skb(skb);
|
||||
netlink_set_err(rtnl, 0, RTNLGRP_IPV4_RULE, EINVAL);
|
||||
} else {
|
||||
netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV4_RULE, GFP_KERNEL);
|
||||
if (frh->src_len && (rule4->src_len != frh->src_len))
|
||||
return 0;
|
||||
|
||||
if (frh->dst_len && (rule4->dst_len != frh->dst_len))
|
||||
return 0;
|
||||
|
||||
if (frh->tos && (rule4->tos != frh->tos))
|
||||
return 0;
|
||||
|
||||
#ifdef CONFIG_IP_ROUTE_FWMARK
|
||||
if (tb[FRA_FWMARK] && (rule4->fwmark != nla_get_u32(tb[FRA_FWMARK])))
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
if (tb[FRA_FLOW] && (rule4->tclassid != nla_get_u32(tb[FRA_FLOW])))
|
||||
return 0;
|
||||
#endif
|
||||
|
||||
if (tb[FRA_SRC] && (rule4->src != nla_get_u32(tb[FRA_SRC])))
|
||||
return 0;
|
||||
|
||||
if (tb[FRA_DST] && (rule4->dst != nla_get_u32(tb[FRA_DST])))
|
||||
return 0;
|
||||
|
||||
return 1;
|
||||
}
|
||||
|
||||
static int fib4_rule_fill(struct fib_rule *rule, struct sk_buff *skb,
|
||||
struct nlmsghdr *nlh, struct fib_rule_hdr *frh)
|
||||
{
|
||||
struct fib4_rule *rule4 = (struct fib4_rule *) rule;
|
||||
|
||||
frh->family = AF_INET;
|
||||
frh->dst_len = rule4->dst_len;
|
||||
frh->src_len = rule4->src_len;
|
||||
frh->tos = rule4->tos;
|
||||
|
||||
#ifdef CONFIG_IP_ROUTE_FWMARK
|
||||
if (rule4->fwmark)
|
||||
NLA_PUT_U32(skb, FRA_FWMARK, rule4->fwmark);
|
||||
#endif
|
||||
|
||||
if (rule4->dst_len)
|
||||
NLA_PUT_U32(skb, FRA_DST, rule4->dst);
|
||||
|
||||
if (rule4->src_len)
|
||||
NLA_PUT_U32(skb, FRA_SRC, rule4->src);
|
||||
|
||||
#ifdef CONFIG_NET_CLS_ROUTE
|
||||
if (rule4->tclassid)
|
||||
NLA_PUT_U32(skb, FRA_FLOW, rule4->tclassid);
|
||||
#endif
|
||||
return 0;
|
||||
|
||||
nla_put_failure:
|
||||
return -ENOBUFS;
|
||||
}
|
||||
|
||||
int fib4_rules_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
||||
{
|
||||
return fib_rules_dump(skb, cb, AF_INET);
|
||||
}
|
||||
|
||||
static u32 fib4_rule_default_pref(void)
|
||||
{
|
||||
struct list_head *pos;
|
||||
struct fib_rule *rule;
|
||||
|
||||
if (!list_empty(&fib4_rules)) {
|
||||
pos = fib4_rules.next;
|
||||
if (pos->next != &fib4_rules) {
|
||||
rule = list_entry(pos->next, struct fib_rule, list);
|
||||
if (rule->pref)
|
||||
return rule->pref - 1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int inet_dump_rules(struct sk_buff *skb, struct netlink_callback *cb)
|
||||
static struct fib_rules_ops fib4_rules_ops = {
|
||||
.family = AF_INET,
|
||||
.rule_size = sizeof(struct fib4_rule),
|
||||
.action = fib4_rule_action,
|
||||
.match = fib4_rule_match,
|
||||
.configure = fib4_rule_configure,
|
||||
.compare = fib4_rule_compare,
|
||||
.fill = fib4_rule_fill,
|
||||
.default_pref = fib4_rule_default_pref,
|
||||
.nlgroup = RTNLGRP_IPV4_RULE,
|
||||
.policy = fib4_rule_policy,
|
||||
.rules_list = &fib4_rules,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
void __init fib4_rules_init(void)
|
||||
{
|
||||
int idx = 0;
|
||||
int s_idx = cb->args[0];
|
||||
struct fib_rule *r;
|
||||
struct hlist_node *node;
|
||||
list_add_tail(&local_rule.common.list, &fib4_rules);
|
||||
list_add_tail(&main_rule.common.list, &fib4_rules);
|
||||
list_add_tail(&default_rule.common.list, &fib4_rules);
|
||||
|
||||
rcu_read_lock();
|
||||
hlist_for_each_entry(r, node, &fib_rules, hlist) {
|
||||
if (idx < s_idx)
|
||||
goto next;
|
||||
if (inet_fill_rule(skb, r, NETLINK_CB(cb->skb).pid,
|
||||
cb->nlh->nlmsg_seq,
|
||||
RTM_NEWRULE, NLM_F_MULTI) < 0)
|
||||
break;
|
||||
next:
|
||||
idx++;
|
||||
}
|
||||
rcu_read_unlock();
|
||||
cb->args[0] = idx;
|
||||
|
||||
return skb->len;
|
||||
fib_rules_register(&fib4_rules_ops);
|
||||
}
|
||||
|
||||
void __init fib_rules_init(void)
|
||||
void __exit fib4_rules_cleanup(void)
|
||||
{
|
||||
INIT_HLIST_HEAD(&fib_rules);
|
||||
hlist_add_head(&local_rule.hlist, &fib_rules);
|
||||
hlist_add_after(&local_rule.hlist, &main_rule.hlist);
|
||||
hlist_add_after(&main_rule.hlist, &default_rule.hlist);
|
||||
register_netdevice_notifier(&fib_rules_notifier);
|
||||
fib_rules_unregister(&fib4_rules_ops);
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue