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#ifndef _NETWORK_H_
#define _NETWORK_H_
#include <sys/types.h>
struct nethdr {
u_int16_t flags;
u_int16_t len;
u_int32_t seq;
};
#define NETHDR_SIZ sizeof(struct nethdr)
#define NETHDR_DATA(x) \
(struct netpld *)(((char *)x) + sizeof(struct nethdr))
struct nethdr_ack {
u_int16_t flags;
u_int16_t len;
u_int32_t seq;
u_int32_t from;
u_int32_t to;
};
#define NETHDR_ACK_SIZ sizeof(struct nethdr_ack)
enum {
NET_F_HELLO_BIT = 0,
NET_F_HELLO = (1 << NET_F_HELLO_BIT),
NET_F_RESYNC_BIT = 1,
NET_F_RESYNC = (1 << NET_F_RESYNC_BIT),
NET_F_NACK_BIT = 2,
NET_F_NACK = (1 << NET_F_NACK_BIT),
NET_F_ACK_BIT = 3,
NET_F_ACK = (1 << NET_F_ACK_BIT),
NET_F_ALIVE_BIT = 4,
NET_F_ALIVE = (1 << NET_F_ALIVE_BIT),
};
#define BUILD_NETMSG(ct, query) \
({ \
char __net[4096]; \
memset(__net, 0, sizeof(__net)); \
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);
int prepare_send_netmsg(struct mcast_sock *m, void *data);
int mcast_send_netmsg(struct mcast_sock *m, void *data);
int mcast_recv_netmsg(struct mcast_sock *m, void *data, int len);
#define IS_DATA(x) ((x->flags & ~NET_F_HELLO) == 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 HDR_NETWORK2HOST(x) \
({ \
x->flags = ntohs(x->flags); \
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->flags = htons(x->flags); \
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(__u32 seq1, __u32 seq2)
{
return (__s32)(seq1-seq2) < 0;
}
#define after(seq2, seq1) before(seq1, seq2)
/* is s2<=s1<=s3 ? */
static inline int between(__u32 seq1, __u32 seq2, __u32 seq3)
{
return seq3 - seq2 >= seq1 - seq2;
}
struct netpld {
u_int16_t len;
u_int16_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 {
u_int16_t nta_len;
u_int16_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(NTA_LENGTH(x->nta_len)); \
(struct netattr *)(((char *)x) + NTA_ALIGN(NTA_LENGTH(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))
#endif
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