521 lines
12 KiB
C
521 lines
12 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_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 fib6_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 fib6_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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/*
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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 fib6_nh {
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struct in6_addr nh_gw;
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struct net_device *nh_dev;
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struct lwtunnel_state *nh_lwtstate;
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unsigned int nh_flags;
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atomic_t nh_upper_bound;
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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 *fib6_table;
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struct fib6_info __rcu *fib6_next;
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struct fib6_node __rcu *fib6_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 fib6_siblings;
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unsigned int fib6_nsiblings;
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atomic_t fib6_ref;
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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 fib6_dst;
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u32 fib6_flags;
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struct rt6key fib6_src;
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struct rt6key fib6_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 fib6_metric;
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u8 fib6_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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struct rcu_head rcu;
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};
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struct rt6_info {
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struct dst_entry dst;
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struct fib6_info __rcu *from;
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struct rt6key rt6i_dst;
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struct rt6key rt6i_src;
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struct in6_addr rt6i_gateway;
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struct inet6_dev *rt6i_idev;
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u32 rt6i_flags;
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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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/* more non-fragment space at head required */
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unsigned short rt6i_nfheader_len;
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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->fib6_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->fib6_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 fib6_clean_expires(struct fib6_info *f6i)
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{
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f6i->fib6_flags &= ~RTF_EXPIRES;
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f6i->expires = 0;
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}
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static inline void fib6_set_expires(struct fib6_info *f6i,
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unsigned long expires)
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{
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f6i->expires = expires;
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f6i->fib6_flags |= RTF_EXPIRES;
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}
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static inline bool fib6_check_expired(const struct fib6_info *f6i)
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{
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if (f6i->fib6_flags & RTF_EXPIRES)
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return time_after(jiffies, f6i->expires);
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return false;
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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 fib6_get_cookie_safe(const struct fib6_info *f6i,
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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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fn = rcu_dereference(f6i->fib6_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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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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struct fib6_info *from;
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u32 cookie = 0;
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rcu_read_lock();
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from = rcu_dereference(rt->from);
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if (from && (rt->rt6i_flags & RTF_PCPU ||
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unlikely(!list_empty(&rt->rt6i_uncached))))
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fib6_get_cookie_safe(from, &cookie);
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rcu_read_unlock();
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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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struct fib6_info *fib6_info_alloc(gfp_t gfp_flags);
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void fib6_info_destroy_rcu(struct rcu_head *head);
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static inline void fib6_info_hold(struct fib6_info *f6i)
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{
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atomic_inc(&f6i->fib6_ref);
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}
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static inline bool fib6_info_hold_safe(struct fib6_info *f6i)
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{
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return atomic_inc_not_zero(&f6i->fib6_ref);
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}
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static inline void fib6_info_release(struct fib6_info *f6i)
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{
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if (f6i && atomic_dec_and_test(&f6i->fib6_ref))
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call_rcu(&f6i->rcu, fib6_info_destroy_rcu);
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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 fib6_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 *,
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const struct sk_buff *, 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 fib6_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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const struct sk_buff *skb,
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int flags, pol_lookup_t lookup);
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/* called with rcu lock held; can return error pointer
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* caller needs to select path
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*/
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struct fib6_info *fib6_lookup(struct net *net, int oif, struct flowi6 *fl6,
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int flags);
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/* called with rcu lock held; caller needs to select path */
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struct fib6_info *fib6_table_lookup(struct net *net, struct fib6_table *table,
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int oif, struct flowi6 *fl6, int strict);
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struct fib6_info *fib6_multipath_select(const struct net *net,
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struct fib6_info *match,
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struct flowi6 *fl6, int oif,
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const struct sk_buff *skb, int strict);
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struct fib6_node *fib6_node_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 fib6_info *, void *arg),
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void *arg);
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int fib6_add(struct fib6_node *root, struct fib6_info *rt,
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struct nl_info *info, struct netlink_ext_ack *extack);
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int fib6_del(struct fib6_info *rt, struct nl_info *info);
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static inline struct net_device *fib6_info_nh_dev(const struct fib6_info *f6i)
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{
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return f6i->fib6_nh.nh_dev;
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}
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static inline
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struct lwtunnel_state *fib6_info_nh_lwt(const struct fib6_info *f6i)
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{
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return f6i->fib6_nh.nh_lwtstate;
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}
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void inet6_rt_notify(int event, struct fib6_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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struct ipv6_route_iter {
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struct seq_net_private p;
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struct fib6_walker w;
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loff_t skip;
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struct fib6_table *tbl;
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int sernum;
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};
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extern const struct seq_operations ipv6_route_seq_ops;
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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 net *net, struct fib6_info *rt);
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void fib6_update_sernum_upto_root(struct net *net, struct fib6_info *rt);
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void fib6_metric_set(struct fib6_info *f6i, int metric, u32 val);
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static inline bool fib6_metric_locked(struct fib6_info *f6i, int metric)
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{
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return !!(f6i->fib6_metrics->metrics[RTAX_LOCK - 1] & (1 << metric));
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}
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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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static inline bool fib6_rules_early_flow_dissect(struct net *net,
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struct sk_buff *skb,
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struct flowi6 *fl6,
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struct flow_keys *flkeys)
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{
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unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP;
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if (!net->ipv6.fib6_rules_require_fldissect)
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return false;
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skb_flow_dissect_flow_keys(skb, flkeys, flag);
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fl6->fl6_sport = flkeys->ports.src;
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fl6->fl6_dport = flkeys->ports.dst;
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fl6->flowi6_proto = flkeys->basic.ip_proto;
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return true;
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}
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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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static inline bool fib6_rules_early_flow_dissect(struct net *net,
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struct sk_buff *skb,
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struct flowi6 *fl6,
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struct flow_keys *flkeys)
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{
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return false;
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}
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#endif
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#endif
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