mirror of https://gitee.com/openkylin/linux.git
441 lines
10 KiB
C
441 lines
10 KiB
C
/*
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#ifndef _IP6_FIB_H
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#define _IP6_FIB_H
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#include <linux/ipv6_route.h>
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#include <linux/rtnetlink.h>
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#include <linux/spinlock.h>
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#include <linux/notifier.h>
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#include <net/dst.h>
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#include <net/flow.h>
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#include <net/netlink.h>
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#include <net/inetpeer.h>
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#include <net/fib_notifier.h>
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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#define FIB6_TABLE_HASHSZ 256
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#else
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#define FIB6_TABLE_HASHSZ 1
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#endif
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#define RT6_DEBUG 2
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#if RT6_DEBUG >= 3
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#define RT6_TRACE(x...) pr_debug(x)
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#else
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#define RT6_TRACE(x...) do { ; } while (0)
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#endif
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struct rt6_info;
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struct fib6_config {
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u32 fc_table;
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u32 fc_metric;
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int fc_dst_len;
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int fc_src_len;
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int fc_ifindex;
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u32 fc_flags;
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u32 fc_protocol;
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u16 fc_type; /* only 8 bits are used */
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u16 fc_delete_all_nh : 1,
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__unused : 15;
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struct in6_addr fc_dst;
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struct in6_addr fc_src;
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struct in6_addr fc_prefsrc;
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struct in6_addr fc_gateway;
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unsigned long fc_expires;
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struct nlattr *fc_mx;
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int fc_mx_len;
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int fc_mp_len;
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struct nlattr *fc_mp;
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struct nl_info fc_nlinfo;
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struct nlattr *fc_encap;
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u16 fc_encap_type;
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};
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struct fib6_node {
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struct fib6_node __rcu *parent;
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struct fib6_node __rcu *left;
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struct fib6_node __rcu *right;
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#ifdef CONFIG_IPV6_SUBTREES
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struct fib6_node __rcu *subtree;
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#endif
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struct rt6_info __rcu *leaf;
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__u16 fn_bit; /* bit key */
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__u16 fn_flags;
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int fn_sernum;
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struct rt6_info __rcu *rr_ptr;
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struct rcu_head rcu;
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};
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struct fib6_gc_args {
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int timeout;
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int more;
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};
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#ifndef CONFIG_IPV6_SUBTREES
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#define FIB6_SUBTREE(fn) NULL
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#else
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#define FIB6_SUBTREE(fn) (rcu_dereference_protected((fn)->subtree, 1))
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#endif
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struct mx6_config {
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const u32 *mx;
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DECLARE_BITMAP(mx_valid, RTAX_MAX);
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};
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/*
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* routing information
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*
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*/
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struct rt6key {
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struct in6_addr addr;
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int plen;
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};
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struct fib6_table;
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struct rt6_exception_bucket {
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struct hlist_head chain;
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int depth;
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};
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struct rt6_exception {
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struct hlist_node hlist;
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struct rt6_info *rt6i;
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unsigned long stamp;
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struct rcu_head rcu;
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};
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#define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
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#define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
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#define FIB6_MAX_DEPTH 5
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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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struct rt6_info *from;
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/*
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* Tail elements of dst_entry (__refcnt etc.)
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* and these elements (rarely used in hot path) are in
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* the same cache line.
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*/
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struct fib6_table *rt6i_table;
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struct fib6_node __rcu *rt6i_node;
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struct in6_addr rt6i_gateway;
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/* Multipath routes:
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* siblings is a list of rt6_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_nh_upper_bound;
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atomic_t rt6i_ref;
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unsigned int rt6i_nh_flags;
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/* These are in a separate cache line. */
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struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
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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 list_head rt6i_uncached;
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struct uncached_list *rt6i_uncached_list;
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struct inet6_dev *rt6i_idev;
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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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u32 rt6i_pmtu;
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/* more non-fragment space at head required */
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int rt6i_nh_weight;
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unsigned short rt6i_nfheader_len;
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u8 rt6i_protocol;
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u8 exception_bucket_flushed:1,
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should_flush:1,
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unused:6;
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};
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#define for_each_fib6_node_rt_rcu(fn) \
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for (rt = rcu_dereference((fn)->leaf); rt; \
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rt = rcu_dereference(rt->rt6_next))
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#define for_each_fib6_walker_rt(w) \
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for (rt = (w)->leaf; rt; \
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rt = rcu_dereference_protected(rt->rt6_next, 1))
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static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
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{
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return ((struct rt6_info *)dst)->rt6i_idev;
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}
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static inline void rt6_clean_expires(struct rt6_info *rt)
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{
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rt->rt6i_flags &= ~RTF_EXPIRES;
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rt->dst.expires = 0;
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}
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static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
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{
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rt->dst.expires = expires;
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rt->rt6i_flags |= RTF_EXPIRES;
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}
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static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
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{
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struct rt6_info *rt;
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for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES); rt = rt->from);
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if (rt && rt != rt0)
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rt0->dst.expires = rt->dst.expires;
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dst_set_expires(&rt0->dst, timeout);
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rt0->rt6i_flags |= RTF_EXPIRES;
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}
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/* Function to safely get fn->sernum for passed in rt
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* and store result in passed in cookie.
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* Return true if we can get cookie safely
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* Return false if not
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*/
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static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
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u32 *cookie)
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{
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struct fib6_node *fn;
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bool status = false;
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rcu_read_lock();
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fn = rcu_dereference(rt->rt6i_node);
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if (fn) {
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*cookie = fn->fn_sernum;
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/* pairs with smp_wmb() in fib6_update_sernum_upto_root() */
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smp_rmb();
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status = true;
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}
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rcu_read_unlock();
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return status;
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}
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static inline u32 rt6_get_cookie(const struct rt6_info *rt)
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{
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u32 cookie = 0;
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if (rt->rt6i_flags & RTF_PCPU ||
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(unlikely(!list_empty(&rt->rt6i_uncached)) && rt->from))
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rt = rt->from;
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rt6_get_cookie_safe(rt, &cookie);
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return cookie;
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}
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static inline void ip6_rt_put(struct rt6_info *rt)
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{
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/* dst_release() accepts a NULL parameter.
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* We rely on dst being first structure in struct rt6_info
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*/
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BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
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dst_release(&rt->dst);
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}
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void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
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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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}
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static inline void rt6_release(struct rt6_info *rt)
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{
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if (atomic_dec_and_test(&rt->rt6i_ref)) {
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rt6_free_pcpu(rt);
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dst_dev_put(&rt->dst);
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dst_release(&rt->dst);
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}
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}
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enum fib6_walk_state {
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#ifdef CONFIG_IPV6_SUBTREES
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FWS_S,
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#endif
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FWS_L,
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FWS_R,
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FWS_C,
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FWS_U
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};
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struct fib6_walker {
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struct list_head lh;
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struct fib6_node *root, *node;
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struct rt6_info *leaf;
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enum fib6_walk_state state;
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unsigned int skip;
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unsigned int count;
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int (*func)(struct fib6_walker *);
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void *args;
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};
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struct rt6_statistics {
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__u32 fib_nodes; /* all fib6 nodes */
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__u32 fib_route_nodes; /* intermediate nodes */
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__u32 fib_rt_entries; /* rt entries in fib table */
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__u32 fib_rt_cache; /* cached rt entries in exception table */
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__u32 fib_discarded_routes; /* total number of routes delete */
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/* The following stats are not protected by any lock */
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atomic_t fib_rt_alloc; /* total number of routes alloced */
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atomic_t fib_rt_uncache; /* rt entries in uncached list */
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};
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#define RTN_TL_ROOT 0x0001
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#define RTN_ROOT 0x0002 /* tree root node */
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#define RTN_RTINFO 0x0004 /* node with valid routing info */
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/*
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* priority levels (or metrics)
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*
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*/
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struct fib6_table {
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struct hlist_node tb6_hlist;
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u32 tb6_id;
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spinlock_t tb6_lock;
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struct fib6_node tb6_root;
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struct inet_peer_base tb6_peers;
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unsigned int flags;
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unsigned int fib_seq;
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#define RT6_TABLE_HAS_DFLT_ROUTER BIT(0)
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};
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#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
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#define RT6_TABLE_MAIN RT_TABLE_MAIN
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#define RT6_TABLE_DFLT RT6_TABLE_MAIN
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#define RT6_TABLE_INFO RT6_TABLE_MAIN
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#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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#define FIB6_TABLE_MIN 1
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#define FIB6_TABLE_MAX RT_TABLE_MAX
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#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
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#else
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#define FIB6_TABLE_MIN RT_TABLE_MAIN
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#define FIB6_TABLE_MAX FIB6_TABLE_MIN
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#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
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#endif
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typedef struct rt6_info *(*pol_lookup_t)(struct net *,
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struct fib6_table *,
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struct flowi6 *, int);
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struct fib6_entry_notifier_info {
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struct fib_notifier_info info; /* must be first */
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struct rt6_info *rt;
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};
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/*
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* exported functions
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*/
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struct fib6_table *fib6_get_table(struct net *net, u32 id);
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struct fib6_table *fib6_new_table(struct net *net, u32 id);
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struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
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int flags, pol_lookup_t lookup);
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struct fib6_node *fib6_lookup(struct fib6_node *root,
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const struct in6_addr *daddr,
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const struct in6_addr *saddr);
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struct fib6_node *fib6_locate(struct fib6_node *root,
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const struct in6_addr *daddr, int dst_len,
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const struct in6_addr *saddr, int src_len,
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bool exact_match);
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void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
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void *arg);
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int fib6_add(struct fib6_node *root, struct rt6_info *rt,
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struct nl_info *info, struct mx6_config *mxc,
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struct netlink_ext_ack *extack);
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int fib6_del(struct rt6_info *rt, struct nl_info *info);
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void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
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unsigned int flags);
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void fib6_run_gc(unsigned long expires, struct net *net, bool force);
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void fib6_gc_cleanup(void);
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int fib6_init(void);
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int ipv6_route_open(struct inode *inode, struct file *file);
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int call_fib6_notifier(struct notifier_block *nb, struct net *net,
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enum fib_event_type event_type,
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struct fib_notifier_info *info);
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int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
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struct fib_notifier_info *info);
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int __net_init fib6_notifier_init(struct net *net);
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void __net_exit fib6_notifier_exit(struct net *net);
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unsigned int fib6_tables_seq_read(struct net *net);
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int fib6_tables_dump(struct net *net, struct notifier_block *nb);
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void fib6_update_sernum(struct rt6_info *rt);
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void fib6_update_sernum_upto_root(struct net *net, struct rt6_info *rt);
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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int fib6_rules_init(void);
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void fib6_rules_cleanup(void);
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bool fib6_rule_default(const struct fib_rule *rule);
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int fib6_rules_dump(struct net *net, struct notifier_block *nb);
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unsigned int fib6_rules_seq_read(struct net *net);
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#else
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static inline int fib6_rules_init(void)
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{
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return 0;
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}
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static inline void fib6_rules_cleanup(void)
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{
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return ;
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}
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static inline bool fib6_rule_default(const struct fib_rule *rule)
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{
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return true;
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}
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static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
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{
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return 0;
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}
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static inline unsigned int fib6_rules_seq_read(struct net *net)
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{
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return 0;
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}
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#endif
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#endif
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