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net/ipv6: introduce fib6_info struct and helpers
Add fib6_info struct and alloc, destroy, hold and release helpers. Signed-off-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -38,6 +38,7 @@
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#endif
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struct rt6_info;
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struct fib6_info;
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struct fib6_config {
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u32 fc_table;
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@ -132,6 +133,46 @@ struct fib6_nh {
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int nh_weight;
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};
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struct fib6_info {
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struct fib6_table *rt6i_table;
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struct fib6_info __rcu *rt6_next;
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struct fib6_node __rcu *rt6i_node;
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/* Multipath routes:
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* siblings is a list of fib6_info that have the the same metric/weight,
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* destination, but not the same gateway. nsiblings is just a cache
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* to speed up lookup.
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*/
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struct list_head rt6i_siblings;
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unsigned int rt6i_nsiblings;
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atomic_t rt6i_ref;
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struct inet6_dev *rt6i_idev;
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unsigned long expires;
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struct dst_metrics *fib6_metrics;
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#define fib6_pmtu fib6_metrics->metrics[RTAX_MTU-1]
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struct rt6key rt6i_dst;
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u32 rt6i_flags;
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struct rt6key rt6i_src;
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struct rt6key rt6i_prefsrc;
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struct rt6_info * __percpu *rt6i_pcpu;
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struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
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u32 rt6i_metric;
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u8 rt6i_protocol;
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u8 fib6_type;
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u8 exception_bucket_flushed:1,
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should_flush:1,
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dst_nocount:1,
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dst_nopolicy:1,
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dst_host:1,
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unused:3;
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struct fib6_nh fib6_nh;
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};
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struct rt6_info {
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struct dst_entry dst;
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struct rt6_info __rcu *rt6_next;
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@ -291,6 +332,20 @@ static inline void ip6_rt_put(struct rt6_info *rt)
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void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
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struct rt6_info *fib6_info_alloc(gfp_t gfp_flags);
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void fib6_info_destroy(struct rt6_info *f6i);
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static inline void fib6_info_hold(struct rt6_info *f6i)
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{
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atomic_inc(&f6i->rt6i_ref);
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}
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static inline void fib6_info_release(struct rt6_info *f6i)
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{
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if (f6i && atomic_dec_and_test(&f6i->rt6i_ref))
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fib6_info_destroy(f6i);
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}
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static inline void rt6_hold(struct rt6_info *rt)
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{
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atomic_inc(&rt->rt6i_ref);
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@ -145,6 +145,66 @@ static __be32 addr_bit_set(const void *token, int fn_bit)
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addr[fn_bit >> 5];
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}
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struct rt6_info *fib6_info_alloc(gfp_t gfp_flags)
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{
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struct rt6_info *f6i;
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f6i = kzalloc(sizeof(*f6i), gfp_flags);
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if (!f6i)
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return NULL;
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f6i->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, gfp_flags);
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if (!f6i->rt6i_pcpu) {
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kfree(f6i);
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return NULL;
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}
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INIT_LIST_HEAD(&f6i->rt6i_siblings);
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f6i->fib6_metrics = (struct dst_metrics *)&dst_default_metrics;
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atomic_inc(&f6i->rt6i_ref);
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return f6i;
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}
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void fib6_info_destroy(struct rt6_info *f6i)
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{
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struct rt6_exception_bucket *bucket;
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WARN_ON(f6i->rt6i_node);
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bucket = rcu_dereference_protected(f6i->rt6i_exception_bucket, 1);
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if (bucket) {
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f6i->rt6i_exception_bucket = NULL;
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kfree(bucket);
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}
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if (f6i->rt6i_pcpu) {
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int cpu;
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for_each_possible_cpu(cpu) {
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struct rt6_info **ppcpu_rt;
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struct rt6_info *pcpu_rt;
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ppcpu_rt = per_cpu_ptr(f6i->rt6i_pcpu, cpu);
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pcpu_rt = *ppcpu_rt;
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if (pcpu_rt) {
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dst_dev_put(&pcpu_rt->dst);
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dst_release(&pcpu_rt->dst);
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*ppcpu_rt = NULL;
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}
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}
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}
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if (f6i->rt6i_idev)
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in6_dev_put(f6i->rt6i_idev);
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if (f6i->fib6_nh.nh_dev)
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dev_put(f6i->fib6_nh.nh_dev);
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kfree(f6i);
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}
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EXPORT_SYMBOL_GPL(fib6_info_destroy);
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static struct fib6_node *node_alloc(struct net *net)
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{
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struct fib6_node *fn;
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