100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
/* ip_mp_alg.h: IPV4 multipath algorithm support.
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*
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* Copyright (C) 2004, 2005 Einar Lueck <elueck@de.ibm.com>
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* Copyright (C) 2005 David S. Miller <davem@davemloft.net>
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*/
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#ifndef _NET_IP_MP_ALG_H
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#define _NET_IP_MP_ALG_H
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#include <linux/config.h>
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#include <linux/ip_mp_alg.h>
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#include <net/flow.h>
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#include <net/route.h>
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struct fib_nh;
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struct ip_mp_alg_ops {
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void (*mp_alg_select_route)(const struct flowi *flp,
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struct rtable *rth, struct rtable **rp);
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void (*mp_alg_flush)(void);
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void (*mp_alg_set_nhinfo)(__u32 network, __u32 netmask,
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unsigned char prefixlen,
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const struct fib_nh *nh);
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void (*mp_alg_remove)(struct rtable *rth);
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};
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extern int multipath_alg_register(struct ip_mp_alg_ops *, enum ip_mp_alg);
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extern void multipath_alg_unregister(struct ip_mp_alg_ops *, enum ip_mp_alg);
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extern struct ip_mp_alg_ops *ip_mp_alg_table[];
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static inline int multipath_select_route(const struct flowi *flp,
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struct rtable *rth,
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struct rtable **rp)
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{
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#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
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struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg];
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/* mp_alg_select_route _MUST_ be implemented */
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if (ops && (rth->u.dst.flags & DST_BALANCED)) {
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ops->mp_alg_select_route(flp, rth, rp);
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return 1;
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}
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#endif
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return 0;
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}
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static inline void multipath_flush(void)
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{
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#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
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int i;
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for (i = IP_MP_ALG_NONE; i <= IP_MP_ALG_MAX; i++) {
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struct ip_mp_alg_ops *ops = ip_mp_alg_table[i];
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if (ops && ops->mp_alg_flush)
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ops->mp_alg_flush();
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}
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#endif
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}
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static inline void multipath_set_nhinfo(struct rtable *rth,
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__u32 network, __u32 netmask,
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unsigned char prefixlen,
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const struct fib_nh *nh)
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{
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#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
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struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg];
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if (ops && ops->mp_alg_set_nhinfo)
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ops->mp_alg_set_nhinfo(network, netmask, prefixlen, nh);
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#endif
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}
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static inline void multipath_remove(struct rtable *rth)
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{
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#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
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struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg];
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if (ops && ops->mp_alg_remove &&
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(rth->u.dst.flags & DST_BALANCED))
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ops->mp_alg_remove(rth);
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#endif
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}
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static inline int multipath_comparekeys(const struct flowi *flp1,
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const struct flowi *flp2)
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{
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return flp1->fl4_dst == flp2->fl4_dst &&
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flp1->fl4_src == flp2->fl4_src &&
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flp1->oif == flp2->oif &&
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#ifdef CONFIG_IP_ROUTE_FWMARK
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flp1->fl4_fwmark == flp2->fl4_fwmark &&
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#endif
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!((flp1->fl4_tos ^ flp2->fl4_tos) &
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(IPTOS_RT_MASK | RTO_ONLINK));
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}
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#endif /* _NET_IP_MP_ALG_H */
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