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1/* ip_mp_alg.h: IPV4 multipath algorithm support.
2 *
3 * Copyright (C) 2004, 2005 Einar Lueck <elueck@de.ibm.com>
4 * Copyright (C) 2005 David S. Miller <davem@davemloft.net>
5 */
6
7#ifndef _NET_IP_MP_ALG_H
8#define _NET_IP_MP_ALG_H
9
10#include <linux/config.h>
11#include <linux/ip_mp_alg.h>
12#include <net/flow.h>
13#include <net/route.h>
14
15struct fib_nh;
16
17struct ip_mp_alg_ops {
18 void (*mp_alg_select_route)(const struct flowi *flp,
19 struct rtable *rth, struct rtable **rp);
20 void (*mp_alg_flush)(void);
21 void (*mp_alg_set_nhinfo)(__u32 network, __u32 netmask,
22 unsigned char prefixlen,
23 const struct fib_nh *nh);
24 void (*mp_alg_remove)(struct rtable *rth);
25};
26
27extern int multipath_alg_register(struct ip_mp_alg_ops *, enum ip_mp_alg);
28extern void multipath_alg_unregister(struct ip_mp_alg_ops *, enum ip_mp_alg);
29
30extern struct ip_mp_alg_ops *ip_mp_alg_table[];
31
32static inline int multipath_select_route(const struct flowi *flp,
33 struct rtable *rth,
34 struct rtable **rp)
35{
36#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
37 struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg];
38
39 /* mp_alg_select_route _MUST_ be implemented */
40 if (ops && (rth->u.dst.flags & DST_BALANCED)) {
41 ops->mp_alg_select_route(flp, rth, rp);
42 return 1;
43 }
44#endif
45 return 0;
46}
47
48static inline void multipath_flush(void)
49{
50#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
51 int i;
52
53 for (i = IP_MP_ALG_NONE; i <= IP_MP_ALG_MAX; i++) {
54 struct ip_mp_alg_ops *ops = ip_mp_alg_table[i];
55
56 if (ops && ops->mp_alg_flush)
57 ops->mp_alg_flush();
58 }
59#endif
60}
61
62static inline void multipath_set_nhinfo(struct rtable *rth,
63 __u32 network, __u32 netmask,
64 unsigned char prefixlen,
65 const struct fib_nh *nh)
66{
67#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
68 struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg];
69
70 if (ops && ops->mp_alg_set_nhinfo)
71 ops->mp_alg_set_nhinfo(network, netmask, prefixlen, nh);
72#endif
73}
74
75static inline void multipath_remove(struct rtable *rth)
76{
77#ifdef CONFIG_IP_ROUTE_MULTIPATH_CACHED
78 struct ip_mp_alg_ops *ops = ip_mp_alg_table[rth->rt_multipath_alg];
79
80 if (ops && ops->mp_alg_remove &&
81 (rth->u.dst.flags & DST_BALANCED))
82 ops->mp_alg_remove(rth);
83#endif
84}
85
86static inline int multipath_comparekeys(const struct flowi *flp1,
87 const struct flowi *flp2)
88{
89 return flp1->fl4_dst == flp2->fl4_dst &&
90 flp1->fl4_src == flp2->fl4_src &&
91 flp1->oif == flp2->oif &&
92#ifdef CONFIG_IP_ROUTE_FWMARK
93 flp1->fl4_fwmark == flp2->fl4_fwmark &&
94#endif
95 !((flp1->fl4_tos ^ flp2->fl4_tos) &
96 (IPTOS_RT_MASK | RTO_ONLINK));
97}
98
99#endif /* _NET_IP_MP_ALG_H */