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ipv6: keep track of routes using src
Use a per namespace counter, increment it on successful creation of any route using the source address, decrement it on deletion of such routes. This allows us to check easily if the routing decision in the current namespace depends on the packet source. Will be used by the next patch. Suggested-by: David Ahern <dsahern@gmail.com> Signed-off-by: Paolo Abeni <pabeni@redhat.com> Reviewed-by: David Ahern <dsahern@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -90,7 +90,32 @@ struct fib6_gc_args {
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#ifndef CONFIG_IPV6_SUBTREES
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#define FIB6_SUBTREE(fn) NULL
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static inline bool fib6_routes_require_src(const struct net *net)
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{
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return false;
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}
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static inline void fib6_routes_require_src_inc(struct net *net) {}
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static inline void fib6_routes_require_src_dec(struct net *net) {}
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#else
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static inline bool fib6_routes_require_src(const struct net *net)
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{
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return net->ipv6.fib6_routes_require_src > 0;
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}
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static inline void fib6_routes_require_src_inc(struct net *net)
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{
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net->ipv6.fib6_routes_require_src++;
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}
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static inline void fib6_routes_require_src_dec(struct net *net)
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{
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net->ipv6.fib6_routes_require_src--;
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}
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#define FIB6_SUBTREE(fn) (rcu_dereference_protected((fn)->subtree, 1))
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#endif
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@ -212,6 +237,11 @@ static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
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return ((struct rt6_info *)dst)->rt6i_idev;
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}
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static inline bool fib6_requires_src(const struct fib6_info *rt)
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{
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return rt->fib6_src.plen > 0;
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}
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static inline void fib6_clean_expires(struct fib6_info *f6i)
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{
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f6i->fib6_flags &= ~RTF_EXPIRES;
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@ -83,6 +83,9 @@ struct netns_ipv6 {
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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unsigned int fib6_rules_require_fldissect;
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bool fib6_has_custom_rules;
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#ifdef CONFIG_IPV6_SUBTREES
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unsigned int fib6_routes_require_src;
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#endif
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struct rt6_info *ip6_prohibit_entry;
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struct rt6_info *ip6_blk_hole_entry;
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struct fib6_table *fib6_local_tbl;
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@ -1461,6 +1461,8 @@ int fib6_add(struct fib6_node *root, struct fib6_info *rt,
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}
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#endif
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goto failure;
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} else if (fib6_requires_src(rt)) {
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fib6_routes_require_src_inc(info->nl_net);
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}
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return err;
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@ -1933,6 +1935,8 @@ int fib6_del(struct fib6_info *rt, struct nl_info *info)
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struct fib6_info *cur = rcu_dereference_protected(*rtp,
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lockdep_is_held(&table->tb6_lock));
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if (rt == cur) {
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if (fib6_requires_src(cur))
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fib6_routes_require_src_dec(info->nl_net);
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fib6_del_route(table, fn, rtp, info);
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return 0;
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}
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@ -6199,6 +6199,9 @@ static int __net_init ip6_route_net_init(struct net *net)
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dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
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ip6_template_metrics, true);
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INIT_LIST_HEAD(&net->ipv6.ip6_blk_hole_entry->rt6i_uncached);
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#ifdef CONFIG_IPV6_SUBTREES
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net->ipv6.fib6_routes_require_src = 0;
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#endif
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#endif
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net->ipv6.sysctl.flush_delay = 0;
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