if_var.h

Newlib 嵌入式 C库 标准实现代码

#define IF_ENQUEUE(ifq, m) do {					\
	IF_LOCK(ifq); 						\
	_IF_ENQUEUE(ifq, m); 					\
	IF_UNLOCK(ifq); 					\
} while (0)

#define	_IF_PREPEND(ifq, m) do {				\
	(m)->m_nextpkt = (ifq)->ifq_head; 			\
	if ((ifq)->ifq_tail == NULL) 				\
		(ifq)->ifq_tail = (m); 				\
	(ifq)->ifq_head = (m); 					\
	(ifq)->ifq_len++; 					\
} while (0)

#define IF_PREPEND(ifq, m) do {		 			\
	IF_LOCK(ifq); 						\
	_IF_PREPEND(ifq, m); 					\
	IF_UNLOCK(ifq); 					\
} while (0)

#define	_IF_DEQUEUE(ifq, m) do { 				\
	(m) = (ifq)->ifq_head; 					\
	if (m) { 						\
		if (((ifq)->ifq_head = (m)->m_nextpkt) == 0) 	\
			(ifq)->ifq_tail = NULL; 		\
		(m)->m_nextpkt = NULL; 				\
		(ifq)->ifq_len--; 				\
	} 							\
} while (0)

#define IF_DEQUEUE(ifq, m) do { 				\
	IF_LOCK(ifq); 						\
	_IF_DEQUEUE(ifq, m); 					\
	IF_UNLOCK(ifq); 					\
} while (0)

#define IF_DRAIN(ifq) do { 					\
	struct mbuf *m; 					\
	IF_LOCK(ifq); 						\
	for (;;) { 						\
		_IF_DEQUEUE(ifq, m); 				\
		if (m == NULL) 					\
			break; 					\
		m_freem(m); 					\
	} 							\
	IF_UNLOCK(ifq); 					\
} while (0)

#ifdef _KERNEL
#define	IF_HANDOFF(ifq, m, ifp)			if_handoff(ifq, m, ifp, 0)
#define	IF_HANDOFF_ADJ(ifq, m, ifp, adj)	if_handoff(ifq, m, ifp, adj)

static __inline int
if_handoff(struct ifqueue *ifq, struct mbuf *m, struct ifnet *ifp, int adjust)
{
	int active = 0;

	IF_LOCK(ifq);
	if (_IF_QFULL(ifq)) {
		_IF_DROP(ifq);
		IF_UNLOCK(ifq);
		m_freem(m);
		return (0);
	}
	if (ifp != NULL) {
		ifp->if_obytes += m->m_pkthdr.len + adjust;
		if (m->m_flags & M_MCAST)
			ifp->if_omcasts++;
		active = ifp->if_flags & IFF_OACTIVE;
	}
	_IF_ENQUEUE(ifq, m);
	IF_UNLOCK(ifq);
	if (ifp != NULL && !active)
		(*ifp->if_start)(ifp);
	return (1);
}

/*
 * 72 was chosen below because it is the size of a TCP/IP
 * header (40) + the minimum mss (32).
 */
#define	IF_MINMTU	72
#define	IF_MAXMTU	65535

#endif /* _KERNEL */

/*
 * The ifaddr structure contains information about one address
 * of an interface.  They are maintained by the different address families,
 * are allocated and attached when an address is set, and are linked
 * together so all addresses for an interface can be located.
 */
struct ifaddr {
	struct	sockaddr *ifa_addr;	/* address of interface */
	struct	sockaddr *ifa_dstaddr;	/* other end of p-to-p link */
#define	ifa_broadaddr	ifa_dstaddr	/* broadcast address interface */
	struct	sockaddr *ifa_netmask;	/* used to determine subnet */
	struct	if_data if_data;	/* not all members are meaningful */
	struct	ifnet *ifa_ifp;		/* back-pointer to interface */
	TAILQ_ENTRY(ifaddr) ifa_link;	/* queue macro glue */
	void	(*ifa_rtrequest)	/* check or clean routes (+ or -)'d */
		(int, struct rtentry *, struct rt_addrinfo *);
	u_short	ifa_flags;		/* mostly rt_flags for cloning */
	u_int	ifa_refcnt;		/* references to this structure */
	int	ifa_metric;		/* cost of going out this interface */
#ifdef notdef
	struct	rtentry *ifa_rt;	/* XXXX for ROUTETOIF ????? */
#endif
	int (*ifa_claim_addr)		/* check if an addr goes to this if */
		(struct ifaddr *, struct sockaddr *);

};
#define	IFA_ROUTE	RTF_UP		/* route installed */

/* for compatibility with other BSDs */
#define	ifa_list	ifa_link

/*
 * The prefix structure contains information about one prefix
 * of an interface.  They are maintained by the different address families,
 * are allocated and attached when an prefix or an address is set,
 * and are linked together so all prefixes for an interface can be located.
 */
struct ifprefix {
	struct	sockaddr *ifpr_prefix;	/* prefix of interface */
	struct	ifnet *ifpr_ifp;	/* back-pointer to interface */
	TAILQ_ENTRY(ifprefix) ifpr_list; /* queue macro glue */
	u_char	ifpr_plen;		/* prefix length in bits */
	u_char	ifpr_type;		/* protocol dependent prefix type */
};

/*
 * Multicast address structure.  This is analogous to the ifaddr
 * structure except that it keeps track of multicast addresses.
 * Also, the reference count here is a count of requests for this
 * address, not a count of pointers to this structure.
 */
struct ifmultiaddr {
	TAILQ_ENTRY(ifmultiaddr) ifma_link; /* queue macro glue */
	struct	sockaddr *ifma_addr; 	/* address this membership is for */
	struct	sockaddr *ifma_lladdr;	/* link-layer translation, if any */
	struct	ifnet *ifma_ifp;	/* back-pointer to interface */
	u_int	ifma_refcount;		/* reference count */
	void	*ifma_protospec;	/* protocol-specific state, if any */
};

#ifdef _KERNEL
#define	IFAFREE(ifa) \
	do { \
		if ((ifa)->ifa_refcnt <= 0) \
			ifafree(ifa); \
		else \
			(ifa)->ifa_refcnt--; \
	} while (0)

struct ifindex_entry {
	struct	ifnet *ife_ifnet;
	struct	ifaddr *ife_ifnet_addr;
	dev_t	ife_dev;
};

#define ifnet_byindex(idx)	ifindex_table[(idx)].ife_ifnet
#define ifaddr_byindex(idx)	ifindex_table[(idx)].ife_ifnet_addr
#define ifdev_byindex(idx)	ifindex_table[(idx)].ife_dev

extern	struct ifnethead ifnet;
extern	struct ifindex_entry *ifindex_table;
extern	int ifqmaxlen;
extern	struct ifnet *loif;	/* first loopback interface */
extern	int if_index;

void	ether_ifattach(struct ifnet *, int);
void	ether_ifdetach(struct ifnet *, int);
void	ether_input(struct ifnet *, struct ether_header *, struct mbuf *);
void	ether_demux(struct ifnet *, struct ether_header *, struct mbuf *);
int	ether_output(struct ifnet *,
	   struct mbuf *, struct sockaddr *, struct rtentry *);
int	ether_output_frame(struct ifnet *, struct mbuf *);
int	ether_ioctl(struct ifnet *, int, caddr_t);

int	if_addmulti(struct ifnet *, struct sockaddr *, struct ifmultiaddr **);
int	if_allmulti(struct ifnet *, int);
void	if_attach(struct ifnet *);
int	if_delmulti(struct ifnet *, struct sockaddr *);
void	if_detach(struct ifnet *);
void	if_down(struct ifnet *);
void	if_route(struct ifnet *, int flag, int fam);
int	if_setlladdr(struct ifnet *, const u_char *, int);
void	if_unroute(struct ifnet *, int flag, int fam);
void	if_up(struct ifnet *);
/*void	ifinit(void);*/ /* declared in systm.h for main() */
int	ifioctl(struct socket *, u_long, caddr_t, struct thread *);
int	ifpromisc(struct ifnet *, int);
struct	ifnet *ifunit(const char *);
struct	ifnet *if_withname(struct sockaddr *);

int	if_poll_recv_slow(struct ifnet *ifp, int *quotap);
void	if_poll_xmit_slow(struct ifnet *ifp, int *quotap);
void	if_poll_throttle(void);
void	if_poll_unthrottle(void *);
void	if_poll_init(void);
void	if_poll(void);

struct	ifaddr *ifa_ifwithaddr(struct sockaddr *);
struct	ifaddr *ifa_ifwithdstaddr(struct sockaddr *);
struct	ifaddr *ifa_ifwithnet(struct sockaddr *);
struct	ifaddr *ifa_ifwithroute(int, struct sockaddr *, struct sockaddr *);
struct	ifaddr *ifaof_ifpforaddr(struct sockaddr *, struct ifnet *);
void	ifafree(struct ifaddr *);

struct	ifmultiaddr *ifmaof_ifpforaddr(struct sockaddr *, struct ifnet *);
int	if_simloop(struct ifnet *ifp, struct mbuf *m, int af, int hlen);

void	if_clone_attach(struct if_clone *);
void	if_clone_detach(struct if_clone *);

int	if_clone_create(char *, int);
int	if_clone_destroy(const char *);

#define IF_LLADDR(ifp)							\
    LLADDR((struct sockaddr_dl *) ifaddr_byindex((ifp)->if_index)->ifa_addr)

#ifdef DEVICE_POLLING
enum poll_cmd {	POLL_ONLY, POLL_AND_CHECK_STATUS, POLL_DEREGISTER };

typedef	void poll_handler_t(struct ifnet *ifp, enum poll_cmd cmd, int count);
int    ether_poll_register(poll_handler_t *h, struct ifnet *ifp);
int    ether_poll_deregister(struct ifnet *ifp);
#endif /* DEVICE_POLLING */

#endif /* _KERNEL */

#endif /* !_NET_IF_VAR_H_ */