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[NETFILTER]: Core changes required by upcoming nfnetlink_queue code

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- split netfiler verdict in 16bit verdict and 16bit queue number
- add 'queuenum' argument to nf_queue_outfn_t and its users ip[6]_queue
- move NFNL_SUBSYS_ definitions from enum to #define
- introduce autoloading for nfnetlink subsystem modules
- add MODULE_ALIAS_NFNL_SUBSYS macro
- add nf_unregister_queue_handlers() to register all handlers for a given
  nf_queue_outfn_t
- add more verbose DEBUGP macro definition to nfnetlink.c
- make nfnetlink_subsys_register fail if subsys already exists
- add some more comments and debug statements to nfnetlink.c

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Harald Welte 2005-08-09 19:43:44 -07:00 • committed by David S. Miller
commit 0ab43f8499
6 changed files with 83 additions and 25 deletions
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14
include/linux/netfilter.h
View file

@ -21,6 +21,16 @@
#define NF_STOP 5
#define NF_MAX_VERDICT NF_STOP
/* we overload the higher bits for encoding auxiliary data such as the queue
* number. Not nice, but better than additional function arguments. */
#define NF_VERDICT_MASK 0x0000ffff
#define NF_VERDICT_BITS 16
#define NF_VERDICT_QMASK 0xffff0000
#define NF_VERDICT_QBITS 16
#define NF_QUEUE_NR(x) ((x << NF_VERDICT_QBITS) & NF_VERDICT_QMASK || NF_QUEUE)
/* only for userspace compatibility */
#ifndef __KERNEL__
/* Generic cache responses from hook functions.
@ -179,10 +189,12 @@ int nf_getsockopt(struct sock *sk, int pf, int optval, char __user *opt,
/* Packet queuing */
typedef int (*nf_queue_outfn_t)(struct sk_buff *skb,
struct nf_info *info, void *data);
struct nf_info *info,
unsigned int queuenum, void *data);
extern int nf_register_queue_handler(int pf,
nf_queue_outfn_t outfn, void *data);
extern int nf_unregister_queue_handler(int pf);
extern void nf_unregister_queue_handlers(nf_queue_outfn_t outfn);
extern void nf_reinject(struct sk_buff *skb,
struct nf_info *info,
unsigned int verdict);

20
include/linux/netfilter/nfnetlink.h
View file

@ -69,15 +69,14 @@ struct nfgenmsg {
#define NFNL_SUBSYS_ID(x) ((x & 0xff00) >> 8)
#define NFNL_MSG_TYPE(x) (x & 0x00ff)
enum nfnl_subsys_id {
NFNL_SUBSYS_NONE = 0,
NFNL_SUBSYS_CTNETLINK,
NFNL_SUBSYS_CTNETLINK_EXP,
NFNL_SUBSYS_IPTNETLINK,
NFNL_SUBSYS_QUEUE,
NFNL_SUBSYS_ULOG,
NFNL_SUBSYS_COUNT,
};
/* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
* won't work anymore */
#define NFNL_SUBSYS_NONE 0
#define NFNL_SUBSYS_CTNETLINK 1
#define NFNL_SUBSYS_CTNETLINK_EXP 2
#define NFNL_SUBSYS_QUEUE 3
#define NFNL_SUBSYS_ULOG 4
#define NFNL_SUBSYS_COUNT 5
#ifdef __KERNEL__
@ -142,5 +141,8 @@ extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group,
int echo);
extern int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags);
#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
#endif /* __KERNEL__ */
#endif /* _NFNETLINK_H */