cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dst_cache.h (3031B)

      1/* SPDX-License-Identifier: GPL-2.0 */
      2#ifndef _NET_DST_CACHE_H
      3#define _NET_DST_CACHE_H
      4
      5#include <linux/jiffies.h>
      6#include <net/dst.h>
      7#if IS_ENABLED(CONFIG_IPV6)
      8#include <net/ip6_fib.h>
      9#endif
     10
     11struct dst_cache {
     12	struct dst_cache_pcpu __percpu *cache;
     13	unsigned long reset_ts;
     14};
     15
     16/**
     17 *	dst_cache_get - perform cache lookup
     18 *	@dst_cache: the cache
     19 *
     20 *	The caller should use dst_cache_get_ip4() if it need to retrieve the
     21 *	source address to be used when xmitting to the cached dst.
     22 *	local BH must be disabled.
     23 */
     24struct dst_entry *dst_cache_get(struct dst_cache *dst_cache);
     25
     26/**
     27 *	dst_cache_get_ip4 - perform cache lookup and fetch ipv4 source address
     28 *	@dst_cache: the cache
     29 *	@saddr: return value for the retrieved source address
     30 *
     31 *	local BH must be disabled.
     32 */
     33struct rtable *dst_cache_get_ip4(struct dst_cache *dst_cache, __be32 *saddr);
     34
     35/**
     36 *	dst_cache_set_ip4 - store the ipv4 dst into the cache
     37 *	@dst_cache: the cache
     38 *	@dst: the entry to be cached
     39 *	@saddr: the source address to be stored inside the cache
     40 *
     41 *	local BH must be disabled.
     42 */
     43void dst_cache_set_ip4(struct dst_cache *dst_cache, struct dst_entry *dst,
     44		       __be32 saddr);
     45
     46#if IS_ENABLED(CONFIG_IPV6)
     47
     48/**
     49 *	dst_cache_set_ip6 - store the ipv6 dst into the cache
     50 *	@dst_cache: the cache
     51 *	@dst: the entry to be cached
     52 *	@saddr: the source address to be stored inside the cache
     53 *
     54 *	local BH must be disabled.
     55 */
     56void dst_cache_set_ip6(struct dst_cache *dst_cache, struct dst_entry *dst,
     57		       const struct in6_addr *saddr);
     58
     59/**
     60 *	dst_cache_get_ip6 - perform cache lookup and fetch ipv6 source address
     61 *	@dst_cache: the cache
     62 *	@saddr: return value for the retrieved source address
     63 *
     64 *	local BH must be disabled.
     65 */
     66struct dst_entry *dst_cache_get_ip6(struct dst_cache *dst_cache,
     67				    struct in6_addr *saddr);
     68#endif
     69
     70/**
     71 *	dst_cache_reset - invalidate the cache contents
     72 *	@dst_cache: the cache
     73 *
     74 *	This does not free the cached dst to avoid races and contentions.
     75 *	the dst will be freed on later cache lookup.
     76 */
     77static inline void dst_cache_reset(struct dst_cache *dst_cache)
     78{
     79	dst_cache->reset_ts = jiffies;
     80}
     81
     82/**
     83 *	dst_cache_reset_now - invalidate the cache contents immediately
     84 *	@dst_cache: the cache
     85 *
     86 *	The caller must be sure there are no concurrent users, as this frees
     87 *	all dst_cache users immediately, rather than waiting for the next
     88 *	per-cpu usage like dst_cache_reset does. Most callers should use the
     89 *	higher speed lazily-freed dst_cache_reset function instead.
     90 */
     91void dst_cache_reset_now(struct dst_cache *dst_cache);
     92
     93/**
     94 *	dst_cache_init - initialize the cache, allocating the required storage
     95 *	@dst_cache: the cache
     96 *	@gfp: allocation flags
     97 */
     98int dst_cache_init(struct dst_cache *dst_cache, gfp_t gfp);
     99
    100/**
    101 *	dst_cache_destroy - empty the cache and free the allocated storage
    102 *	@dst_cache: the cache
    103 *
    104 *	No synchronization is enforced: it must be called only when the cache
    105 *	is unsed.
    106 */
    107void dst_cache_destroy(struct dst_cache *dst_cache);
    108
    109#endif