1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
|
#ifndef _NETWORK_H_
#define _NETWORK_H_
#include <stdint.h>
#include <sys/types.h>
#define CONNTRACKD_PROTOCOL_VERSION 1
struct nf_conntrack;
struct nf_expect;
struct nethdr {
#if __BYTE_ORDER == __LITTLE_ENDIAN
uint8_t type:4,
version:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
uint8_t version:4,
type:4;
#else
#error "Unknown system endianess!"
#endif
uint8_t flags;
uint16_t len;
uint32_t seq;
};
#define NETHDR_SIZ nethdr_align(sizeof(struct nethdr))
enum nethdr_type {
NET_T_STATE_CT_NEW = 0,
NET_T_STATE_CT_UPD,
NET_T_STATE_CT_DEL,
NET_T_STATE_EXP_NEW = 3,
NET_T_STATE_EXP_UPD,
NET_T_STATE_EXP_DEL,
NET_T_STATE_MAX = NET_T_STATE_EXP_DEL,
NET_T_CTL = 10,
};
int nethdr_align(int len);
int nethdr_size(int len);
void nethdr_set(struct nethdr *net, int type);
void nethdr_set_ack(struct nethdr *net);
void nethdr_set_ctl(struct nethdr *net);
struct cache_object;
int object_status_to_network_type(struct cache_object *obj);
#define NETHDR_DATA(x) \
(struct netattr *)(((char *)x) + NETHDR_SIZ)
#define NETHDR_TAIL(x) \
(struct netattr *)(((char *)x) + x->len)
struct nethdr_ack {
#if __BYTE_ORDER == __LITTLE_ENDIAN
uint8_t type:4,
version:4;
#elif __BYTE_ORDER == __BIG_ENDIAN
uint8_t version:4,
type:4;
#else
#error "Unknown system endianess!"
#endif
uint8_t flags;
uint16_t len;
uint32_t seq;
uint32_t from;
uint32_t to;
};
#define NETHDR_ACK_SIZ nethdr_align(sizeof(struct nethdr_ack))
enum {
NET_F_UNUSED = (1 << 0),
NET_F_RESYNC = (1 << 1),
NET_F_NACK = (1 << 2),
NET_F_ACK = (1 << 3),
NET_F_ALIVE = (1 << 4),
NET_F_HELLO = (1 << 5),
NET_F_HELLO_BACK= (1 << 6),
};
enum {
MSG_DATA,
MSG_CTL,
MSG_DROP,
MSG_BAD,
};
#define BUILD_NETMSG_FROM_CT(ct, query) \
({ \
static char __net[4096]; \
struct nethdr *__hdr = (struct nethdr *) __net; \
memset(__hdr, 0, NETHDR_SIZ); \
nethdr_set(__hdr, query); \
ct2msg(ct, __hdr); \
HDR_HOST2NETWORK(__hdr); \
__hdr; \
})
#define BUILD_NETMSG_FROM_EXP(exp, query) \
({ \
static char __net[4096]; \
struct nethdr *__hdr = (struct nethdr *) __net; \
memset(__hdr, 0, NETHDR_SIZ); \
nethdr_set(__hdr, query); \
exp2msg(exp, __hdr); \
HDR_HOST2NETWORK(__hdr); \
__hdr; \
})
struct mcast_sock_multi;
enum {
SEQ_UNKNOWN,
SEQ_UNSET,
SEQ_IN_SYNC,
SEQ_AFTER,
SEQ_BEFORE,
};
int nethdr_track_seq(uint32_t seq, uint32_t *exp_seq);
void nethdr_track_update_seq(uint32_t seq);
int nethdr_track_is_seq_set(void);
struct mcast_conf;
#define IS_DATA(x) (x->type <= NET_T_STATE_MAX && \
(x->flags & ~(NET_F_HELLO | NET_F_HELLO_BACK)) == 0)
#define IS_ACK(x) (x->type == NET_T_CTL && x->flags & NET_F_ACK)
#define IS_NACK(x) (x->type == NET_T_CTL && x->flags & NET_F_NACK)
#define IS_RESYNC(x) (x->type == NET_T_CTL && x->flags & NET_F_RESYNC)
#define IS_ALIVE(x) (x->type == NET_T_CTL && x->flags & NET_F_ALIVE)
#define IS_HELLO(x) (x->flags & NET_F_HELLO)
#define IS_HELLO_BACK(x)(x->flags & NET_F_HELLO_BACK)
#define HDR_NETWORK2HOST(x) \
({ \
x->len = ntohs(x->len); \
x->seq = ntohl(x->seq); \
if (IS_ACK(x) || IS_NACK(x) || IS_RESYNC(x)) { \
struct nethdr_ack *__ack = (struct nethdr_ack *) x; \
__ack->from = ntohl(__ack->from); \
__ack->to = ntohl(__ack->to); \
} \
})
#define HDR_HOST2NETWORK(x) \
({ \
if (IS_ACK(x) || IS_NACK(x) || IS_RESYNC(x)) { \
struct nethdr_ack *__ack = (struct nethdr_ack *) x; \
__ack->from = htonl(__ack->from); \
__ack->to = htonl(__ack->to); \
} \
x->len = htons(x->len); \
x->seq = htonl(x->seq); \
})
/* extracted from net/tcp.h */
/*
* The next routines deal with comparing 32 bit unsigned ints
* and worry about wraparound (automatic with unsigned arithmetic).
*/
static inline int before(uint32_t seq1, uint32_t seq2)
{
return (int32_t)(seq1-seq2) < 0;
}
#define after(seq2, seq1) before(seq1, seq2)
/* is s2<=s1<=s3 ? */
static inline int between(uint32_t seq1, uint32_t seq2, uint32_t seq3)
{
return seq3 - seq2 >= seq1 - seq2;
}
#define PLD_NETWORK2HOST(x) \
({ \
x->len = ntohs(x->len); \
x->query = ntohs(x->query); \
})
#define PLD_HOST2NETWORK(x) \
({ \
x->len = htons(x->len); \
x->query = htons(x->query); \
})
struct netattr {
uint16_t nta_len;
uint16_t nta_attr;
};
#define ATTR_NETWORK2HOST(x) \
({ \
x->nta_len = ntohs(x->nta_len); \
x->nta_attr = ntohs(x->nta_attr); \
})
#define NTA_SIZE(len) NTA_ALIGN(sizeof(struct netattr)) + len
#define NTA_DATA(x) \
(void *)(((char *)x) + NTA_ALIGN(sizeof(struct netattr)))
#define NTA_NEXT(x, len) \
( \
len -= NTA_ALIGN(x->nta_len), \
(struct netattr *)(((char *)x) + NTA_ALIGN(x->nta_len)) \
)
#define NTA_ALIGNTO 4
#define NTA_ALIGN(len) (((len) + NTA_ALIGNTO - 1) & ~(NTA_ALIGNTO - 1))
#define NTA_LENGTH(len) (NTA_ALIGN(sizeof(struct netattr)) + (len))
enum nta_attr {
NTA_IPV4 = 0, /* struct nfct_attr_grp_ipv4 */
NTA_IPV6, /* struct nfct_attr_grp_ipv6 */
NTA_L4PROTO, /* uint8_t */
NTA_PORT, /* struct nfct_attr_grp_port */
NTA_TCP_STATE = 4, /* uint8_t */
NTA_STATUS, /* uint32_t */
NTA_TIMEOUT, /* uint32_t */
NTA_MARK, /* uint32_t */
NTA_MASTER_IPV4 = 8, /* struct nfct_attr_grp_ipv4 */
NTA_MASTER_IPV6, /* struct nfct_attr_grp_ipv6 */
NTA_MASTER_L4PROTO, /* uint8_t */
NTA_MASTER_PORT, /* struct nfct_attr_grp_port */
NTA_SNAT_IPV4 = 12, /* uint32_t */
NTA_DNAT_IPV4, /* uint32_t */
NTA_SPAT_PORT, /* uint16_t */
NTA_DPAT_PORT, /* uint16_t */
NTA_NAT_SEQ_ADJ = 16, /* struct nta_attr_natseqadj */
NTA_SCTP_STATE, /* uint8_t */
NTA_SCTP_VTAG_ORIG, /* uint32_t */
NTA_SCTP_VTAG_REPL, /* uint32_t */
NTA_DCCP_STATE = 20, /* uint8_t */
NTA_DCCP_ROLE, /* uint8_t */
NTA_ICMP_TYPE, /* uint8_t */
NTA_ICMP_CODE, /* uint8_t */
NTA_ICMP_ID, /* uint16_t */
NTA_TCP_WSCALE_ORIG, /* uint8_t */
NTA_TCP_WSCALE_REPL, /* uint8_t */
NTA_MAX
};
struct nta_attr_natseqadj {
uint32_t orig_seq_correction_pos;
uint32_t orig_seq_offset_before;
uint32_t orig_seq_offset_after;
uint32_t repl_seq_correction_pos;
uint32_t repl_seq_offset_before;
uint32_t repl_seq_offset_after;
};
void ct2msg(const struct nf_conntrack *ct, struct nethdr *n);
int msg2ct(struct nf_conntrack *ct, struct nethdr *n, size_t remain);
enum nta_exp_attr {
NTA_EXP_MASTER_IPV4 = 0, /* struct nfct_attr_grp_ipv4 */
NTA_EXP_MASTER_IPV6, /* struct nfct_attr_grp_ipv6 */
NTA_EXP_MASTER_L4PROTO, /* uint8_t */
NTA_EXP_MASTER_PORT, /* struct nfct_attr_grp_port */
NTA_EXP_EXPECT_IPV4 = 4, /* struct nfct_attr_grp_ipv4 */
NTA_EXP_EXPECT_IPV6, /* struct nfct_attr_grp_ipv6 */
NTA_EXP_EXPECT_L4PROTO, /* uint8_t */
NTA_EXP_EXPECT_PORT, /* struct nfct_attr_grp_port */
NTA_EXP_MASK_IPV4 = 8, /* struct nfct_attr_grp_ipv4 */
NTA_EXP_MASK_IPV6, /* struct nfct_attr_grp_ipv6 */
NTA_EXP_MASK_L4PROTO, /* uint8_t */
NTA_EXP_MASK_PORT, /* struct nfct_attr_grp_port */
NTA_EXP_TIMEOUT, /* uint32_t */
NTA_EXP_FLAGS, /* uint32_t */
NTA_EXP_MAX
};
void exp2msg(const struct nf_expect *exp, struct nethdr *n);
int msg2exp(struct nf_expect *exp, struct nethdr *n, size_t remain);
#endif
|
