mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-24 13:59:22 +07:00
35732d01fe
Add a hash table into struct rt6_info in order to store dst caches created by pmtu discovery and ip redirect in ipv6 routing code. APIs to add dst cache, delete dst cache, find dst cache and update dst cache in the hash table are implemented and will be used in later commits. This is a preparation work to move all cache routes into the exception table instead of getting inserted into the fib6 tree. Signed-off-by: Wei Wang <weiwan@google.com> Signed-off-by: Martin KaFai Lau <kafai@fb.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
411 lines
9.3 KiB
C
411 lines
9.3 KiB
C
/*
|
|
* Linux INET6 implementation
|
|
*
|
|
* Authors:
|
|
* Pedro Roque <roque@di.fc.ul.pt>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#ifndef _IP6_FIB_H
|
|
#define _IP6_FIB_H
|
|
|
|
#include <linux/ipv6_route.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/notifier.h>
|
|
#include <net/dst.h>
|
|
#include <net/flow.h>
|
|
#include <net/netlink.h>
|
|
#include <net/inetpeer.h>
|
|
#include <net/fib_notifier.h>
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
#define FIB6_TABLE_HASHSZ 256
|
|
#else
|
|
#define FIB6_TABLE_HASHSZ 1
|
|
#endif
|
|
|
|
struct rt6_info;
|
|
|
|
struct fib6_config {
|
|
u32 fc_table;
|
|
u32 fc_metric;
|
|
int fc_dst_len;
|
|
int fc_src_len;
|
|
int fc_ifindex;
|
|
u32 fc_flags;
|
|
u32 fc_protocol;
|
|
u16 fc_type; /* only 8 bits are used */
|
|
u16 fc_delete_all_nh : 1,
|
|
__unused : 15;
|
|
|
|
struct in6_addr fc_dst;
|
|
struct in6_addr fc_src;
|
|
struct in6_addr fc_prefsrc;
|
|
struct in6_addr fc_gateway;
|
|
|
|
unsigned long fc_expires;
|
|
struct nlattr *fc_mx;
|
|
int fc_mx_len;
|
|
int fc_mp_len;
|
|
struct nlattr *fc_mp;
|
|
|
|
struct nl_info fc_nlinfo;
|
|
struct nlattr *fc_encap;
|
|
u16 fc_encap_type;
|
|
};
|
|
|
|
struct fib6_node {
|
|
struct fib6_node *parent;
|
|
struct fib6_node *left;
|
|
struct fib6_node *right;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
struct fib6_node *subtree;
|
|
#endif
|
|
struct rt6_info *leaf;
|
|
|
|
__u16 fn_bit; /* bit key */
|
|
__u16 fn_flags;
|
|
int fn_sernum;
|
|
struct rt6_info *rr_ptr;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
#ifndef CONFIG_IPV6_SUBTREES
|
|
#define FIB6_SUBTREE(fn) NULL
|
|
#else
|
|
#define FIB6_SUBTREE(fn) ((fn)->subtree)
|
|
#endif
|
|
|
|
struct mx6_config {
|
|
const u32 *mx;
|
|
DECLARE_BITMAP(mx_valid, RTAX_MAX);
|
|
};
|
|
|
|
/*
|
|
* routing information
|
|
*
|
|
*/
|
|
|
|
struct rt6key {
|
|
struct in6_addr addr;
|
|
int plen;
|
|
};
|
|
|
|
struct fib6_table;
|
|
|
|
struct rt6_exception_bucket {
|
|
struct hlist_head chain;
|
|
int depth;
|
|
};
|
|
|
|
struct rt6_exception {
|
|
struct hlist_node hlist;
|
|
struct rt6_info *rt6i;
|
|
unsigned long stamp;
|
|
struct rcu_head rcu;
|
|
};
|
|
|
|
#define FIB6_EXCEPTION_BUCKET_SIZE_SHIFT 10
|
|
#define FIB6_EXCEPTION_BUCKET_SIZE (1 << FIB6_EXCEPTION_BUCKET_SIZE_SHIFT)
|
|
#define FIB6_MAX_DEPTH 5
|
|
|
|
struct rt6_info {
|
|
struct dst_entry dst;
|
|
|
|
/*
|
|
* Tail elements of dst_entry (__refcnt etc.)
|
|
* and these elements (rarely used in hot path) are in
|
|
* the same cache line.
|
|
*/
|
|
struct fib6_table *rt6i_table;
|
|
struct fib6_node __rcu *rt6i_node;
|
|
|
|
struct in6_addr rt6i_gateway;
|
|
|
|
/* Multipath routes:
|
|
* siblings is a list of rt6_info that have the the same metric/weight,
|
|
* destination, but not the same gateway. nsiblings is just a cache
|
|
* to speed up lookup.
|
|
*/
|
|
struct list_head rt6i_siblings;
|
|
unsigned int rt6i_nsiblings;
|
|
|
|
atomic_t rt6i_ref;
|
|
|
|
unsigned int rt6i_nh_flags;
|
|
|
|
/* These are in a separate cache line. */
|
|
struct rt6key rt6i_dst ____cacheline_aligned_in_smp;
|
|
u32 rt6i_flags;
|
|
struct rt6key rt6i_src;
|
|
struct rt6key rt6i_prefsrc;
|
|
|
|
struct list_head rt6i_uncached;
|
|
struct uncached_list *rt6i_uncached_list;
|
|
|
|
struct inet6_dev *rt6i_idev;
|
|
struct rt6_info * __percpu *rt6i_pcpu;
|
|
struct rt6_exception_bucket __rcu *rt6i_exception_bucket;
|
|
|
|
u32 rt6i_metric;
|
|
u32 rt6i_pmtu;
|
|
/* more non-fragment space at head required */
|
|
unsigned short rt6i_nfheader_len;
|
|
u8 rt6i_protocol;
|
|
u8 exception_bucket_flushed:1,
|
|
unused:7;
|
|
};
|
|
|
|
static inline struct inet6_dev *ip6_dst_idev(struct dst_entry *dst)
|
|
{
|
|
return ((struct rt6_info *)dst)->rt6i_idev;
|
|
}
|
|
|
|
static inline void rt6_clean_expires(struct rt6_info *rt)
|
|
{
|
|
rt->rt6i_flags &= ~RTF_EXPIRES;
|
|
rt->dst.expires = 0;
|
|
}
|
|
|
|
static inline void rt6_set_expires(struct rt6_info *rt, unsigned long expires)
|
|
{
|
|
rt->dst.expires = expires;
|
|
rt->rt6i_flags |= RTF_EXPIRES;
|
|
}
|
|
|
|
static inline void rt6_update_expires(struct rt6_info *rt0, int timeout)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
for (rt = rt0; rt && !(rt->rt6i_flags & RTF_EXPIRES);
|
|
rt = (struct rt6_info *)rt->dst.from);
|
|
if (rt && rt != rt0)
|
|
rt0->dst.expires = rt->dst.expires;
|
|
|
|
dst_set_expires(&rt0->dst, timeout);
|
|
rt0->rt6i_flags |= RTF_EXPIRES;
|
|
}
|
|
|
|
/* Function to safely get fn->sernum for passed in rt
|
|
* and store result in passed in cookie.
|
|
* Return true if we can get cookie safely
|
|
* Return false if not
|
|
*/
|
|
static inline bool rt6_get_cookie_safe(const struct rt6_info *rt,
|
|
u32 *cookie)
|
|
{
|
|
struct fib6_node *fn;
|
|
bool status = false;
|
|
|
|
rcu_read_lock();
|
|
fn = rcu_dereference(rt->rt6i_node);
|
|
|
|
if (fn) {
|
|
*cookie = fn->fn_sernum;
|
|
status = true;
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
return status;
|
|
}
|
|
|
|
static inline u32 rt6_get_cookie(const struct rt6_info *rt)
|
|
{
|
|
u32 cookie = 0;
|
|
|
|
if (rt->rt6i_flags & RTF_PCPU ||
|
|
(unlikely(!list_empty(&rt->rt6i_uncached)) && rt->dst.from))
|
|
rt = (struct rt6_info *)(rt->dst.from);
|
|
|
|
rt6_get_cookie_safe(rt, &cookie);
|
|
|
|
return cookie;
|
|
}
|
|
|
|
static inline void ip6_rt_put(struct rt6_info *rt)
|
|
{
|
|
/* dst_release() accepts a NULL parameter.
|
|
* We rely on dst being first structure in struct rt6_info
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct rt6_info, dst) != 0);
|
|
dst_release(&rt->dst);
|
|
}
|
|
|
|
void rt6_free_pcpu(struct rt6_info *non_pcpu_rt);
|
|
|
|
static inline void rt6_hold(struct rt6_info *rt)
|
|
{
|
|
atomic_inc(&rt->rt6i_ref);
|
|
}
|
|
|
|
static inline void rt6_release(struct rt6_info *rt)
|
|
{
|
|
if (atomic_dec_and_test(&rt->rt6i_ref)) {
|
|
rt6_free_pcpu(rt);
|
|
dst_dev_put(&rt->dst);
|
|
dst_release(&rt->dst);
|
|
}
|
|
}
|
|
|
|
enum fib6_walk_state {
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
FWS_S,
|
|
#endif
|
|
FWS_L,
|
|
FWS_R,
|
|
FWS_C,
|
|
FWS_U
|
|
};
|
|
|
|
struct fib6_walker {
|
|
struct list_head lh;
|
|
struct fib6_node *root, *node;
|
|
struct rt6_info *leaf;
|
|
enum fib6_walk_state state;
|
|
bool prune;
|
|
unsigned int skip;
|
|
unsigned int count;
|
|
int (*func)(struct fib6_walker *);
|
|
void *args;
|
|
};
|
|
|
|
struct rt6_statistics {
|
|
__u32 fib_nodes;
|
|
__u32 fib_route_nodes;
|
|
__u32 fib_rt_alloc; /* permanent routes */
|
|
__u32 fib_rt_entries; /* rt entries in table */
|
|
__u32 fib_rt_cache; /* cache routes */
|
|
__u32 fib_discarded_routes;
|
|
};
|
|
|
|
#define RTN_TL_ROOT 0x0001
|
|
#define RTN_ROOT 0x0002 /* tree root node */
|
|
#define RTN_RTINFO 0x0004 /* node with valid routing info */
|
|
|
|
/*
|
|
* priority levels (or metrics)
|
|
*
|
|
*/
|
|
|
|
|
|
struct fib6_table {
|
|
struct hlist_node tb6_hlist;
|
|
u32 tb6_id;
|
|
rwlock_t tb6_lock;
|
|
struct fib6_node tb6_root;
|
|
struct inet_peer_base tb6_peers;
|
|
unsigned int flags;
|
|
unsigned int fib_seq;
|
|
#define RT6_TABLE_HAS_DFLT_ROUTER BIT(0)
|
|
};
|
|
|
|
#define RT6_TABLE_UNSPEC RT_TABLE_UNSPEC
|
|
#define RT6_TABLE_MAIN RT_TABLE_MAIN
|
|
#define RT6_TABLE_DFLT RT6_TABLE_MAIN
|
|
#define RT6_TABLE_INFO RT6_TABLE_MAIN
|
|
#define RT6_TABLE_PREFIX RT6_TABLE_MAIN
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
#define FIB6_TABLE_MIN 1
|
|
#define FIB6_TABLE_MAX RT_TABLE_MAX
|
|
#define RT6_TABLE_LOCAL RT_TABLE_LOCAL
|
|
#else
|
|
#define FIB6_TABLE_MIN RT_TABLE_MAIN
|
|
#define FIB6_TABLE_MAX FIB6_TABLE_MIN
|
|
#define RT6_TABLE_LOCAL RT6_TABLE_MAIN
|
|
#endif
|
|
|
|
typedef struct rt6_info *(*pol_lookup_t)(struct net *,
|
|
struct fib6_table *,
|
|
struct flowi6 *, int);
|
|
|
|
struct fib6_entry_notifier_info {
|
|
struct fib_notifier_info info; /* must be first */
|
|
struct rt6_info *rt;
|
|
};
|
|
|
|
/*
|
|
* exported functions
|
|
*/
|
|
|
|
struct fib6_table *fib6_get_table(struct net *net, u32 id);
|
|
struct fib6_table *fib6_new_table(struct net *net, u32 id);
|
|
struct dst_entry *fib6_rule_lookup(struct net *net, struct flowi6 *fl6,
|
|
int flags, pol_lookup_t lookup);
|
|
|
|
struct fib6_node *fib6_lookup(struct fib6_node *root,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr);
|
|
|
|
struct fib6_node *fib6_locate(struct fib6_node *root,
|
|
const struct in6_addr *daddr, int dst_len,
|
|
const struct in6_addr *saddr, int src_len);
|
|
|
|
void fib6_clean_all(struct net *net, int (*func)(struct rt6_info *, void *arg),
|
|
void *arg);
|
|
|
|
int fib6_add(struct fib6_node *root, struct rt6_info *rt,
|
|
struct nl_info *info, struct mx6_config *mxc,
|
|
struct netlink_ext_ack *extack);
|
|
int fib6_del(struct rt6_info *rt, struct nl_info *info);
|
|
|
|
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
|
|
unsigned int flags);
|
|
|
|
void fib6_run_gc(unsigned long expires, struct net *net, bool force);
|
|
|
|
void fib6_gc_cleanup(void);
|
|
|
|
int fib6_init(void);
|
|
|
|
int ipv6_route_open(struct inode *inode, struct file *file);
|
|
|
|
int call_fib6_notifier(struct notifier_block *nb, struct net *net,
|
|
enum fib_event_type event_type,
|
|
struct fib_notifier_info *info);
|
|
int call_fib6_notifiers(struct net *net, enum fib_event_type event_type,
|
|
struct fib_notifier_info *info);
|
|
|
|
int __net_init fib6_notifier_init(struct net *net);
|
|
void __net_exit fib6_notifier_exit(struct net *net);
|
|
|
|
unsigned int fib6_tables_seq_read(struct net *net);
|
|
int fib6_tables_dump(struct net *net, struct notifier_block *nb);
|
|
|
|
void fib6_update_sernum(struct rt6_info *rt);
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
int fib6_rules_init(void);
|
|
void fib6_rules_cleanup(void);
|
|
bool fib6_rule_default(const struct fib_rule *rule);
|
|
int fib6_rules_dump(struct net *net, struct notifier_block *nb);
|
|
unsigned int fib6_rules_seq_read(struct net *net);
|
|
#else
|
|
static inline int fib6_rules_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void fib6_rules_cleanup(void)
|
|
{
|
|
return ;
|
|
}
|
|
static inline bool fib6_rule_default(const struct fib_rule *rule)
|
|
{
|
|
return true;
|
|
}
|
|
static inline int fib6_rules_dump(struct net *net, struct notifier_block *nb)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline unsigned int fib6_rules_seq_read(struct net *net)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
#endif
|