tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1#ifndef _NFNETLINK_H
2#define _NFNETLINK_H
3#include <linux/types.h>
4
5#ifndef __KERNEL__
6/* nfnetlink groups: Up to 32 maximum - backwards compatibility for userspace */
7#define NF_NETLINK_CONNTRACK_NEW 0x00000001
8#define NF_NETLINK_CONNTRACK_UPDATE 0x00000002
9#define NF_NETLINK_CONNTRACK_DESTROY 0x00000004
10#define NF_NETLINK_CONNTRACK_EXP_NEW 0x00000008
11#define NF_NETLINK_CONNTRACK_EXP_UPDATE 0x00000010
12#define NF_NETLINK_CONNTRACK_EXP_DESTROY 0x00000020
13#endif
14
15enum nfnetlink_groups {
16 NFNLGRP_NONE,
17#define NFNLGRP_NONE NFNLGRP_NONE
18 NFNLGRP_CONNTRACK_NEW,
19#define NFNLGRP_CONNTRACK_NEW NFNLGRP_CONNTRACK_NEW
20 NFNLGRP_CONNTRACK_UPDATE,
21#define NFNLGRP_CONNTRACK_UPDATE NFNLGRP_CONNTRACK_UPDATE
22 NFNLGRP_CONNTRACK_DESTROY,
23#define NFNLGRP_CONNTRACK_DESTROY NFNLGRP_CONNTRACK_DESTROY
24 NFNLGRP_CONNTRACK_EXP_NEW,
25#define NFNLGRP_CONNTRACK_EXP_NEW NFNLGRP_CONNTRACK_EXP_NEW
26 NFNLGRP_CONNTRACK_EXP_UPDATE,
27#define NFNLGRP_CONNTRACK_EXP_UPDATE NFNLGRP_CONNTRACK_EXP_UPDATE
28 NFNLGRP_CONNTRACK_EXP_DESTROY,
29#define NFNLGRP_CONNTRACK_EXP_DESTROY NFNLGRP_CONNTRACK_EXP_DESTROY
30 __NFNLGRP_MAX,
31};
32#define NFNLGRP_MAX (__NFNLGRP_MAX - 1)
33
34/* Generic structure for encapsulation optional netfilter information.
35 * It is reminiscent of sockaddr, but with sa_family replaced
36 * with attribute type.
37 * ! This should someday be put somewhere generic as now rtnetlink and
38 * ! nfnetlink use the same attributes methods. - J. Schulist.
39 */
40
41struct nfattr
42{
43 u_int16_t nfa_len;
44 u_int16_t nfa_type;
45} __attribute__ ((packed));
46
47/* FIXME: Shamelessly copy and pasted from rtnetlink.h, it's time
48 * to put this in a generic file */
49
50#define NFA_ALIGNTO 4
51#define NFA_ALIGN(len) (((len) + NFA_ALIGNTO - 1) & ~(NFA_ALIGNTO - 1))
52#define NFA_OK(nfa,len) ((len) > 0 && (nfa)->nfa_len >= sizeof(struct nfattr) \
53 && (nfa)->nfa_len <= (len))
54#define NFA_NEXT(nfa,attrlen) ((attrlen) -= NFA_ALIGN((nfa)->nfa_len), \
55 (struct nfattr *)(((char *)(nfa)) + NFA_ALIGN((nfa)->nfa_len)))
56#define NFA_LENGTH(len) (NFA_ALIGN(sizeof(struct nfattr)) + (len))
57#define NFA_SPACE(len) NFA_ALIGN(NFA_LENGTH(len))
58#define NFA_DATA(nfa) ((void *)(((char *)(nfa)) + NFA_LENGTH(0)))
59#define NFA_PAYLOAD(nfa) ((int)((nfa)->nfa_len) - NFA_LENGTH(0))
60#define NFA_NEST(skb, type) \
61({ struct nfattr *__start = (struct nfattr *) (skb)->tail; \
62 NFA_PUT(skb, type, 0, NULL); \
63 __start; })
64#define NFA_NEST_END(skb, start) \
65({ (start)->nfa_len = ((skb)->tail - (unsigned char *) (start)); \
66 (skb)->len; })
67#define NFA_NEST_CANCEL(skb, start) \
68({ if (start) \
69 skb_trim(skb, (unsigned char *) (start) - (skb)->data); \
70 -1; })
71
72/* General form of address family dependent message.
73 */
74struct nfgenmsg {
75 u_int8_t nfgen_family; /* AF_xxx */
76 u_int8_t version; /* nfnetlink version */
77 u_int16_t res_id; /* resource id */
78} __attribute__ ((packed));
79
80#define NFNETLINK_V0 0
81
82#define NFM_NFA(n) ((struct nfattr *)(((char *)(n)) \
83 + NLMSG_ALIGN(sizeof(struct nfgenmsg))))
84#define NFM_PAYLOAD(n) NLMSG_PAYLOAD(n, sizeof(struct nfgenmsg))
85
86/* netfilter netlink message types are split in two pieces:
87 * 8 bit subsystem, 8bit operation.
88 */
89
90#define NFNL_SUBSYS_ID(x) ((x & 0xff00) >> 8)
91#define NFNL_MSG_TYPE(x) (x & 0x00ff)
92
93/* No enum here, otherwise __stringify() trick of MODULE_ALIAS_NFNL_SUBSYS()
94 * won't work anymore */
95#define NFNL_SUBSYS_NONE 0
96#define NFNL_SUBSYS_CTNETLINK 1
97#define NFNL_SUBSYS_CTNETLINK_EXP 2
98#define NFNL_SUBSYS_QUEUE 3
99#define NFNL_SUBSYS_ULOG 4
100#define NFNL_SUBSYS_COUNT 5
101
102#ifdef __KERNEL__
103
104#include <linux/netlink.h>
105#include <linux/capability.h>
106
107struct nfnl_callback
108{
109 int (*call)(struct sock *nl, struct sk_buff *skb,
110 struct nlmsghdr *nlh, struct nfattr *cda[], int *errp);
111 kernel_cap_t cap_required; /* capabilities required for this msg */
112 u_int16_t attr_count; /* number of nfattr's */
113};
114
115struct nfnetlink_subsystem
116{
117 const char *name;
118 __u8 subsys_id; /* nfnetlink subsystem ID */
119 __u8 cb_count; /* number of callbacks */
120 struct nfnl_callback *cb; /* callback for individual types */
121};
122
123extern void __nfa_fill(struct sk_buff *skb, int attrtype,
124 int attrlen, const void *data);
125#define NFA_PUT(skb, attrtype, attrlen, data) \
126({ if (skb_tailroom(skb) < (int)NFA_SPACE(attrlen)) goto nfattr_failure; \
127 __nfa_fill(skb, attrtype, attrlen, data); })
128
129extern struct semaphore nfnl_sem;
130
131#define nfnl_shlock() down(&nfnl_sem)
132#define nfnl_shlock_nowait() down_trylock(&nfnl_sem)
133
134#define nfnl_shunlock() do { up(&nfnl_sem); \
135 if(nfnl && nfnl->sk_receive_queue.qlen) \
136 nfnl->sk_data_ready(nfnl, 0); \
137 } while(0)
138
139extern void nfnl_lock(void);
140extern void nfnl_unlock(void);
141
142extern int nfnetlink_subsys_register(struct nfnetlink_subsystem *n);
143extern int nfnetlink_subsys_unregister(struct nfnetlink_subsystem *n);
144
145extern int nfattr_parse(struct nfattr *tb[], int maxattr,
146 struct nfattr *nfa, int len);
147
148#define nfattr_parse_nested(tb, max, nfa) \
149 nfattr_parse((tb), (max), NFA_DATA((nfa)), NFA_PAYLOAD((nfa)))
150
151#define nfattr_bad_size(tb, max, cta_min) \
152({ int __i, __res = 0; \
153 for (__i=0; __i<max; __i++) \
154 if (tb[__i] && NFA_PAYLOAD(tb[__i]) < cta_min[__i]){ \
155 __res = 1; \
156 break; \
157 } \
158 __res; \
159})
160
161extern int nfnetlink_send(struct sk_buff *skb, u32 pid, unsigned group,
162 int echo);
163extern int nfnetlink_unicast(struct sk_buff *skb, u_int32_t pid, int flags);
164
165#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
166 MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))
167
168#endif /* __KERNEL__ */
169#endif /* _NFNETLINK_H */