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56 lines
1.2 KiB
56 lines
1.2 KiB
20 years ago
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/* multipath.c: 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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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/netdevice.h>
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#include <linux/spinlock.h>
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#include <net/ip_mp_alg.h>
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static DEFINE_SPINLOCK(alg_table_lock);
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struct ip_mp_alg_ops *ip_mp_alg_table[IP_MP_ALG_MAX + 1];
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int multipath_alg_register(struct ip_mp_alg_ops *ops, enum ip_mp_alg n)
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{
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struct ip_mp_alg_ops **slot;
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int err;
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if (n < IP_MP_ALG_NONE || n > IP_MP_ALG_MAX ||
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!ops->mp_alg_select_route)
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return -EINVAL;
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spin_lock(&alg_table_lock);
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slot = &ip_mp_alg_table[n];
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if (*slot != NULL) {
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err = -EBUSY;
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} else {
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*slot = ops;
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err = 0;
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}
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spin_unlock(&alg_table_lock);
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return err;
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}
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EXPORT_SYMBOL(multipath_alg_register);
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void multipath_alg_unregister(struct ip_mp_alg_ops *ops, enum ip_mp_alg n)
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{
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struct ip_mp_alg_ops **slot;
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if (n < IP_MP_ALG_NONE || n > IP_MP_ALG_MAX)
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return;
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spin_lock(&alg_table_lock);
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slot = &ip_mp_alg_table[n];
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if (*slot == ops)
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*slot = NULL;
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spin_unlock(&alg_table_lock);
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synchronize_net();
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}
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EXPORT_SYMBOL(multipath_alg_unregister);
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