/* ip_mp_alg.h: IPV4 multipath algorithm support. * * Copyright (C) 2004, 2005 Einar Lueck <elueck@de.ibm.com> * Copyright (C) 2005 David S. Miller <davem@davemloft.net> */ #ifndef _NET_IP_MP_ALG_H#define _NET_IP_MP_ALG_H #include <linux/ip_mp_alg.h>#include <net/flow.h>#include <net/route.h> struct fib_nh; struct ip_mp_alg_ops {	void	(*mp_alg_select_route)(const struct flowi *flp,				       struct rtable *rth, struct rtable **rp);	void	(*mp_alg_flush)(void);	void	(*mp_alg_set_nhinfo)(__be32 network, __be32 netmask,				     unsigned char prefixlen,				     const struct fib_nh *nh);	void	(*mp_alg_remove)(struct rtable *rth);}; extern int multipath_alg_register(struct ip_mp_alg_ops *, enum ip_mp_alg);extern void multipath_alg_unregister(struct ip_mp_alg_ops *, enum ip_mp_alg); extern struct ip_mp_alg_ops *ip_mp_alg_table[]; static inline int multipath_select_route(const struct flowi *flp,					 struct rtable *rth,					 struct rtable **rp){#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED	struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg]; 	/* mp_alg_select_route _MUST_ be implemented */	if (ops && (rth->u.dst.flags & DST_BALANCED)) {		ops->mp_alg_select_route(flp, rth, rp);		return 1;	}#endif	return 0;} static inline void multipath_flush(void){#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED	int i; 	for (i = IP_MP_ALG_NONE; i <= IP_MP_ALG_MAX; i++) {		struct ip_mp_alg_ops *ops = ip_mp_alg_table[i]; 		if (ops && ops->mp_alg_flush)			ops->mp_alg_flush();	}#endif} static inline void multipath_set_nhinfo(struct rtable *rth,					__be32 network, __be32 netmask,					unsigned char prefixlen,					const struct fib_nh *nh){#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED	struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg]; 	if (ops && ops->mp_alg_set_nhinfo)		ops->mp_alg_set_nhinfo(network, netmask, prefixlen, nh);#endif} static inline void multipath_remove(struct rtable *rth){#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED	struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg]; 	if (ops && ops->mp_alg_remove &&	    (rth->u.dst.flags & DST_BALANCED))		ops->mp_alg_remove(rth);#endif} static inline int multipath_comparekeys(const struct flowi *flp1,					const struct flowi *flp2){	return flp1->fl4_dst == flp2->fl4_dst &&		flp1->fl4_src == flp2->fl4_src &&		flp1->oif == flp2->oif &&		flp1->mark == flp2->mark &&		!((flp1->fl4_tos ^ flp2->fl4_tos) &		  (IPTOS_RT_MASK | RTO_ONLINK));} #endif /* _NET_IP_MP_ALG_H */