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![Sabrina Dubroca](/assets/img/avatar_default.png)
When creating new states with seq set in xfrm_usersa_info, we walk through all the states already installed in that netns to find a matching ACQUIRE state (__xfrm_find_acq_byseq, called from xfrm_state_add). This causes severe slowdowns on systems with a large number of states. This patch introduces a hashtable using x->km.seq as key, so that the corresponding state can be found in a reasonable time. Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
199 lines
4.6 KiB
C
199 lines
4.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _XFRM_HASH_H
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#define _XFRM_HASH_H
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#include <linux/xfrm.h>
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#include <linux/socket.h>
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#include <linux/jhash.h>
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static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr)
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{
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return ntohl(addr->a4);
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}
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static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr)
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{
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return jhash2((__force u32 *)addr->a6, 4, 0);
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}
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static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr)
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{
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u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
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return ntohl((__force __be32)sum);
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}
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static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr)
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{
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return __xfrm6_addr_hash(daddr) ^ __xfrm6_addr_hash(saddr);
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}
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static inline u32 __bits2mask32(__u8 bits)
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{
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u32 mask32 = 0xffffffff;
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if (bits == 0)
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mask32 = 0;
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else if (bits < 32)
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mask32 <<= (32 - bits);
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return mask32;
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}
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static inline unsigned int __xfrm4_dpref_spref_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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__u8 dbits,
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__u8 sbits)
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{
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return jhash_2words(ntohl(daddr->a4) & __bits2mask32(dbits),
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ntohl(saddr->a4) & __bits2mask32(sbits),
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0);
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}
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static inline unsigned int __xfrm6_pref_hash(const xfrm_address_t *addr,
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__u8 prefixlen)
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{
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unsigned int pdw;
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unsigned int pbi;
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u32 initval = 0;
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pdw = prefixlen >> 5; /* num of whole u32 in prefix */
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pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
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if (pbi) {
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__be32 mask;
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mask = htonl((0xffffffff) << (32 - pbi));
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initval = (__force u32)(addr->a6[pdw] & mask);
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}
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return jhash2((__force u32 *)addr->a6, pdw, initval);
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}
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static inline unsigned int __xfrm6_dpref_spref_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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__u8 dbits,
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__u8 sbits)
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{
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return __xfrm6_pref_hash(daddr, dbits) ^
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__xfrm6_pref_hash(saddr, sbits);
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}
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static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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u32 reqid, unsigned short family,
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unsigned int hmask)
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{
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unsigned int h = family ^ reqid;
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switch (family) {
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case AF_INET:
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h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
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break;
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case AF_INET6:
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h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
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break;
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}
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return (h ^ (h >> 16)) & hmask;
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}
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static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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unsigned short family,
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unsigned int hmask)
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{
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unsigned int h = family;
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switch (family) {
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case AF_INET:
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h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
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break;
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case AF_INET6:
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h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
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break;
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}
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return (h ^ (h >> 16)) & hmask;
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}
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static inline unsigned int
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__xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto,
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unsigned short family, unsigned int hmask)
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{
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unsigned int h = (__force u32)spi ^ proto;
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switch (family) {
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case AF_INET:
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h ^= __xfrm4_addr_hash(daddr);
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break;
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case AF_INET6:
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h ^= __xfrm6_addr_hash(daddr);
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break;
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}
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return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
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}
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static inline unsigned int
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__xfrm_seq_hash(u32 seq, unsigned int hmask)
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{
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unsigned int h = seq;
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return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
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}
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static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
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{
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return (index ^ (index >> 8)) & hmask;
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}
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static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
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unsigned short family, unsigned int hmask,
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u8 dbits, u8 sbits)
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{
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const xfrm_address_t *daddr = &sel->daddr;
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const xfrm_address_t *saddr = &sel->saddr;
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unsigned int h = 0;
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switch (family) {
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case AF_INET:
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if (sel->prefixlen_d < dbits ||
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sel->prefixlen_s < sbits)
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return hmask + 1;
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h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
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break;
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case AF_INET6:
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if (sel->prefixlen_d < dbits ||
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sel->prefixlen_s < sbits)
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return hmask + 1;
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h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
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break;
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}
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h ^= (h >> 16);
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return h & hmask;
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}
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static inline unsigned int __addr_hash(const xfrm_address_t *daddr,
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const xfrm_address_t *saddr,
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unsigned short family,
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unsigned int hmask,
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u8 dbits, u8 sbits)
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{
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unsigned int h = 0;
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switch (family) {
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case AF_INET:
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h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
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break;
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case AF_INET6:
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h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
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break;
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}
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h ^= (h >> 16);
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return h & hmask;
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}
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struct hlist_head *xfrm_hash_alloc(unsigned int sz);
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void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
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#endif /* _XFRM_HASH_H */
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