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[NETFILTER]: Introduce infrastructure for address family specific operations

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Change the queue rerouter intrastructure to a generic usable
infrastructure for address family specific operations as a base for
some cleanups.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-04-06 14:18:09 -07:00 committed by David S. Miller
parent a0aed49bdb
commit bce8032ef3
5 changed files with 70 additions and 59 deletions
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23
include/linux/netfilter.h
View File

@ -283,16 +283,25 @@ extern void nf_invalidate_cache(int pf);
Returns true or false. */
extern int skb_make_writable(struct sk_buff **pskb, unsigned int writable_len);
struct nf_queue_rerouter {
void (*save)(const struct sk_buff *skb, struct nf_info *info);
int (*reroute)(struct sk_buff **skb, const struct nf_info *info);
int rer_size;
struct nf_afinfo {
unsigned short family;
void (*saveroute)(const struct sk_buff *skb,
struct nf_info *info);
int (*reroute)(struct sk_buff **skb,
const struct nf_info *info);
int route_key_size;
};
#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))
extern struct nf_afinfo *nf_afinfo[];
static inline struct nf_afinfo *nf_get_afinfo(unsigned short family)
{
return rcu_dereference(nf_afinfo[family]);
}
extern int nf_register_queue_rerouter(int pf, struct nf_queue_rerouter *rer);
extern int nf_unregister_queue_rerouter(int pf);
extern int nf_register_afinfo(struct nf_afinfo *afinfo);
extern void nf_unregister_afinfo(struct nf_afinfo *afinfo);
#define nf_info_reroute(x) ((void *)x + sizeof(struct nf_info))
#include <net/flow.h>
extern void (*ip_nat_decode_session)(struct sk_buff *, struct flowi *);

17
net/ipv4/netfilter.c
View File

@ -133,7 +133,7 @@ struct ip_rt_info {
u_int8_t tos;
};
static void queue_save(const struct sk_buff *skb, struct nf_info *info)
static void nf_ip_saveroute(const struct sk_buff *skb, struct nf_info *info)
{
struct ip_rt_info *rt_info = nf_info_reroute(info);
@ -146,7 +146,7 @@ static void queue_save(const struct sk_buff *skb, struct nf_info *info)
}
}
static int queue_reroute(struct sk_buff **pskb, const struct nf_info *info)
static int nf_ip_reroute(struct sk_buff **pskb, const struct nf_info *info)
{
const struct ip_rt_info *rt_info = nf_info_reroute(info);
@ -161,20 +161,21 @@ static int queue_reroute(struct sk_buff **pskb, const struct nf_info *info)
return 0;
}
static struct nf_queue_rerouter ip_reroute = {
.rer_size = sizeof(struct ip_rt_info),
.save = queue_save,
.reroute = queue_reroute,
static struct nf_afinfo nf_ip_afinfo = {
.family = AF_INET,
.saveroute = nf_ip_saveroute,
.reroute = nf_ip_reroute,
.route_key_size = sizeof(struct ip_rt_info),
};
static int ipv4_netfilter_init(void)
{
return nf_register_queue_rerouter(PF_INET, &ip_reroute);
return nf_register_afinfo(&nf_ip_afinfo);
}
static void ipv4_netfilter_fini(void)
{
nf_unregister_queue_rerouter(PF_INET);
nf_unregister_afinfo(&nf_ip_afinfo);
}
module_init(ipv4_netfilter_init);

17
net/ipv6/netfilter.c
View File

@ -54,7 +54,7 @@ struct ip6_rt_info {
struct in6_addr saddr;
};
static void save(const struct sk_buff *skb, struct nf_info *info)
static void nf_ip6_saveroute(const struct sk_buff *skb, struct nf_info *info)
{
struct ip6_rt_info *rt_info = nf_info_reroute(info);
@ -66,7 +66,7 @@ static void save(const struct sk_buff *skb, struct nf_info *info)
}
}
static int reroute(struct sk_buff **pskb, const struct nf_info *info)
static int nf_ip6_reroute(struct sk_buff **pskb, const struct nf_info *info)
{
struct ip6_rt_info *rt_info = nf_info_reroute(info);
@ -79,15 +79,16 @@ static int reroute(struct sk_buff **pskb, const struct nf_info *info)
return 0;
}
static struct nf_queue_rerouter ip6_reroute = {
.rer_size = sizeof(struct ip6_rt_info),
.save = &save,
.reroute = &reroute,
static struct nf_afinfo nf_ip6_afinfo = {
.family = AF_INET6,
.saveroute = nf_ip6_saveroute,
.reroute = nf_ip6_reroute,
.route_key_size = sizeof(struct ip6_rt_info),
};
int __init ipv6_netfilter_init(void)
{
return nf_register_queue_rerouter(PF_INET6, &ip6_reroute);
return nf_register_afinfo(&nf_ip6_afinfo);
}
/* This can be called from inet6_init() on errors, so it cannot
@ -95,5 +96,5 @@ int __init ipv6_netfilter_init(void)
*/
void ipv6_netfilter_fini(void)
{
nf_unregister_queue_rerouter(PF_INET6);
nf_unregister_afinfo(&nf_ip6_afinfo);
}

23
net/netfilter/core.c
View File

@ -27,6 +27,29 @@
#include "nf_internals.h"
static DEFINE_SPINLOCK(afinfo_lock);
struct nf_afinfo *nf_afinfo[NPROTO];
EXPORT_SYMBOL(nf_afinfo);
int nf_register_afinfo(struct nf_afinfo *afinfo)
{
spin_lock(&afinfo_lock);
rcu_assign_pointer(nf_afinfo[afinfo->family], afinfo);
spin_unlock(&afinfo_lock);
return 0;
}
EXPORT_SYMBOL_GPL(nf_register_afinfo);
void nf_unregister_afinfo(struct nf_afinfo *afinfo)
{
spin_lock(&afinfo_lock);
rcu_assign_pointer(nf_afinfo[afinfo->family], NULL);
spin_unlock(&afinfo_lock);
synchronize_rcu();
}
EXPORT_SYMBOL_GPL(nf_unregister_afinfo);
/* In this code, we can be waiting indefinitely for userspace to
* service a packet if a hook returns NF_QUEUE. We could keep a count
* of skbuffs queued for userspace, and not deregister a hook unless

49
net/netfilter/nf_queue.c
View File

@ -17,7 +17,6 @@
* for queueing and must reinject all packets it receives, no matter what.
*/
static struct nf_queue_handler *queue_handler[NPROTO];
static struct nf_queue_rerouter *queue_rerouter[NPROTO];
static DEFINE_RWLOCK(queue_handler_lock);
@ -59,32 +58,6 @@ int nf_unregister_queue_handler(int pf)
}
EXPORT_SYMBOL(nf_unregister_queue_handler);
int nf_register_queue_rerouter(int pf, struct nf_queue_rerouter *rer)
{
if (pf >= NPROTO)
return -EINVAL;
write_lock_bh(&queue_handler_lock);
rcu_assign_pointer(queue_rerouter[pf], rer);
write_unlock_bh(&queue_handler_lock);
return 0;
}
EXPORT_SYMBOL_GPL(nf_register_queue_rerouter);
int nf_unregister_queue_rerouter(int pf)
{
if (pf >= NPROTO)
return -EINVAL;
write_lock_bh(&queue_handler_lock);
rcu_assign_pointer(queue_rerouter[pf], NULL);
write_unlock_bh(&queue_handler_lock);
synchronize_rcu();
return 0;
}
EXPORT_SYMBOL_GPL(nf_unregister_queue_rerouter);
void nf_unregister_queue_handlers(struct nf_queue_handler *qh)
{
int pf;
@ -116,7 +89,7 @@ int nf_queue(struct sk_buff **skb,
struct net_device *physindev = NULL;
struct net_device *physoutdev = NULL;
#endif
struct nf_queue_rerouter *rerouter;
struct nf_afinfo *afinfo;
/* QUEUE == DROP if noone is waiting, to be safe. */
read_lock(&queue_handler_lock);
@ -126,7 +99,14 @@ int nf_queue(struct sk_buff **skb,
return 1;
}
info = kmalloc(sizeof(*info)+queue_rerouter[pf]->rer_size, GFP_ATOMIC);
afinfo = nf_get_afinfo(pf);
if (!afinfo) {
read_unlock(&queue_handler_lock);
kfree_skb(*skb);
return 1;
}
info = kmalloc(sizeof(*info) + afinfo->route_key_size, GFP_ATOMIC);
if (!info) {
if (net_ratelimit())
printk(KERN_ERR "OOM queueing packet %p\n",
@ -158,10 +138,7 @@ int nf_queue(struct sk_buff **skb,
if (physoutdev) dev_hold(physoutdev);
}
#endif
rerouter = rcu_dereference(queue_rerouter[pf]);
if (rerouter)
rerouter->save(*skb, info);
afinfo->saveroute(*skb, info);
status = queue_handler[pf]->outfn(*skb, info, queuenum,
queue_handler[pf]->data);
@ -190,7 +167,7 @@ void nf_reinject(struct sk_buff *skb, struct nf_info *info,
{
struct list_head *elem = &info->elem->list;
struct list_head *i;
struct nf_queue_rerouter *rerouter;
struct nf_afinfo *afinfo;
rcu_read_lock();
@ -228,8 +205,8 @@ void nf_reinject(struct sk_buff *skb, struct nf_info *info,
}
if (verdict == NF_ACCEPT) {
rerouter = rcu_dereference(queue_rerouter[info->pf]);
if (rerouter && rerouter->reroute(&skb, info) < 0)
afinfo = nf_get_afinfo(info->pf);
if (!afinfo || afinfo->reroute(&skb, info) < 0)
verdict = NF_DROP;
}