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#ifndef _NETWORK_H_
#define _NETWORK_H_
#include <stdint.h>
#include <sys/types.h>
#define CONNTRACKD_PROTOCOL_VERSION 0
struct nf_conntrack;
struct nethdr {
uint8_t version;
uint8_t flags;
uint16_t len;
uint32_t seq;
};
#define NETHDR_SIZ sizeof(struct nethdr)
#define NETHDR_DATA(x) \
(struct netpld *)(((char *)x) + sizeof(struct nethdr))
struct nethdr_ack {
uint8_t version;
uint8_t flags;
uint16_t len;
uint32_t seq;
uint32_t from;
uint32_t to;
};
#define NETHDR_ACK_SIZ 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(ct, query) \
({ \
char __net[4096]; \
memset(__net, 0, NETHDR_SIZ + NETPLD_SIZ); \
build_netmsg(ct, query, (struct nethdr *) __net); \
(struct nethdr *) __net; \
})
struct us_conntrack;
struct mcast_sock;
void build_netmsg(struct nf_conntrack *ct, int query, struct nethdr *net);
size_t prepare_send_netmsg(struct mcast_sock *m, void *data);
int mcast_send_netmsg(struct mcast_sock *m, void *data);
enum {
SEQ_UNKNOWN,
SEQ_UNSET,
SEQ_IN_SYNC,
SEQ_AFTER,
SEQ_BEFORE,
};
int mcast_track_seq(uint32_t seq, uint32_t *exp_seq);
void mcast_track_update_seq(uint32_t seq);
int mcast_track_is_seq_set(void);
struct mcast_conf;
int mcast_buffered_init(struct mcast_conf *mconf);
void mcast_buffered_destroy(void);
int mcast_buffered_send_netmsg(struct mcast_sock *m, void *data, size_t len);
ssize_t mcast_buffered_pending_netmsg(struct mcast_sock *m);
#define IS_DATA(x) ((x->flags & ~(NET_F_HELLO | NET_F_HELLO_BACK)) == 0)
#define IS_ACK(x) (x->flags & NET_F_ACK)
#define IS_NACK(x) (x->flags & NET_F_NACK)
#define IS_RESYNC(x) (x->flags & NET_F_RESYNC)
#define IS_ALIVE(x) (x->flags & NET_F_ALIVE)
#define IS_CTL(x) IS_ACK(x) || IS_NACK(x) || IS_RESYNC(x) || IS_ALIVE(x)
#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_CTL(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_CTL(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;
}
struct netpld {
uint16_t len;
uint16_t query;
};
#define NETPLD_SIZ sizeof(struct netpld)
#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 PLD_DATA(x) \
(struct netattr *)(((char *)x) + sizeof(struct netpld))
#define PLD_TAIL(x) \
(struct netattr *)(((char *)x) + sizeof(struct netpld) + x->len)
#define NTA_DATA(x) \
(void *)(((char *)x) + 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_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 */
};
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 build_netpld(struct nf_conntrack *ct, struct netpld *pld, int query);
int parse_netpld(struct nf_conntrack *ct, struct nethdr *net, int *query, size_t remain);
#endif
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