Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 193 insertions, 0 deletions

diff --git a/net/xfrm/xfrm_hash.h b/net/xfrm/xfrm_hash.h
new file mode 100644
index 000000000..61be81038
--- /dev/null
+++ b/net/xfrm/xfrm_hash.h
@@ -0,0 +1,193 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _XFRM_HASH_H
+#define _XFRM_HASH_H
+
+#include <linux/xfrm.h>
+#include <linux/socket.h>
+#include <linux/jhash.h>
+
+static inline unsigned int __xfrm4_addr_hash(const xfrm_address_t *addr)
+{
+	return ntohl(addr->a4);
+}
+
+static inline unsigned int __xfrm6_addr_hash(const xfrm_address_t *addr)
+{
+	return ntohl(addr->a6[2] ^ addr->a6[3]);
+}
+
+static inline unsigned int __xfrm4_daddr_saddr_hash(const xfrm_address_t *daddr,
+						    const xfrm_address_t *saddr)
+{
+	u32 sum = (__force u32)daddr->a4 + (__force u32)saddr->a4;
+	return ntohl((__force __be32)sum);
+}
+
+static inline unsigned int __xfrm6_daddr_saddr_hash(const xfrm_address_t *daddr,
+						    const xfrm_address_t *saddr)
+{
+	return ntohl(daddr->a6[2] ^ daddr->a6[3] ^
+		     saddr->a6[2] ^ saddr->a6[3]);
+}
+
+static inline u32 __bits2mask32(__u8 bits)
+{
+	u32 mask32 = 0xffffffff;
+
+	if (bits == 0)
+		mask32 = 0;
+	else if (bits < 32)
+		mask32 <<= (32 - bits);
+
+	return mask32;
+}
+
+static inline unsigned int __xfrm4_dpref_spref_hash(const xfrm_address_t *daddr,
+						    const xfrm_address_t *saddr,
+						    __u8 dbits,
+						    __u8 sbits)
+{
+	return jhash_2words(ntohl(daddr->a4) & __bits2mask32(dbits),
+			    ntohl(saddr->a4) & __bits2mask32(sbits),
+			    0);
+}
+
+static inline unsigned int __xfrm6_pref_hash(const xfrm_address_t *addr,
+					     __u8 prefixlen)
+{
+	unsigned int pdw;
+	unsigned int pbi;
+	u32 initval = 0;
+
+	pdw = prefixlen >> 5;     /* num of whole u32 in prefix */
+	pbi = prefixlen &  0x1f;  /* num of bits in incomplete u32 in prefix */
+
+	if (pbi) {
+		__be32 mask;
+
+		mask = htonl((0xffffffff) << (32 - pbi));
+
+		initval = (__force u32)(addr->a6[pdw] & mask);
+	}
+
+	return jhash2((__force u32 *)addr->a6, pdw, initval);
+}
+
+static inline unsigned int __xfrm6_dpref_spref_hash(const xfrm_address_t *daddr,
+						    const xfrm_address_t *saddr,
+						    __u8 dbits,
+						    __u8 sbits)
+{
+	return __xfrm6_pref_hash(daddr, dbits) ^
+	       __xfrm6_pref_hash(saddr, sbits);
+}
+
+static inline unsigned int __xfrm_dst_hash(const xfrm_address_t *daddr,
+					   const xfrm_address_t *saddr,
+					   u32 reqid, unsigned short family,
+					   unsigned int hmask)
+{
+	unsigned int h = family ^ reqid;
+	switch (family) {
+	case AF_INET:
+		h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
+		break;
+	case AF_INET6:
+		h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
+		break;
+	}
+	return (h ^ (h >> 16)) & hmask;
+}
+
+static inline unsigned int __xfrm_src_hash(const xfrm_address_t *daddr,
+					   const xfrm_address_t *saddr,
+					   unsigned short family,
+					   unsigned int hmask)
+{
+	unsigned int h = family;
+	switch (family) {
+	case AF_INET:
+		h ^= __xfrm4_daddr_saddr_hash(daddr, saddr);
+		break;
+	case AF_INET6:
+		h ^= __xfrm6_daddr_saddr_hash(daddr, saddr);
+		break;
+	}
+	return (h ^ (h >> 16)) & hmask;
+}
+
+static inline unsigned int
+__xfrm_spi_hash(const xfrm_address_t *daddr, __be32 spi, u8 proto,
+		unsigned short family, unsigned int hmask)
+{
+	unsigned int h = (__force u32)spi ^ proto;
+	switch (family) {
+	case AF_INET:
+		h ^= __xfrm4_addr_hash(daddr);
+		break;
+	case AF_INET6:
+		h ^= __xfrm6_addr_hash(daddr);
+		break;
+	}
+	return (h ^ (h >> 10) ^ (h >> 20)) & hmask;
+}
+
+static inline unsigned int __idx_hash(u32 index, unsigned int hmask)
+{
+	return (index ^ (index >> 8)) & hmask;
+}
+
+static inline unsigned int __sel_hash(const struct xfrm_selector *sel,
+				      unsigned short family, unsigned int hmask,
+				      u8 dbits, u8 sbits)
+{
+	const xfrm_address_t *daddr = &sel->daddr;
+	const xfrm_address_t *saddr = &sel->saddr;
+	unsigned int h = 0;
+
+	switch (family) {
+	case AF_INET:
+		if (sel->prefixlen_d < dbits ||
+		    sel->prefixlen_s < sbits)
+			return hmask + 1;
+
+		h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
+		break;
+
+	case AF_INET6:
+		if (sel->prefixlen_d < dbits ||
+		    sel->prefixlen_s < sbits)
+			return hmask + 1;
+
+		h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
+		break;
+	}
+	h ^= (h >> 16);
+	return h & hmask;
+}
+
+static inline unsigned int __addr_hash(const xfrm_address_t *daddr,
+				       const xfrm_address_t *saddr,
+				       unsigned short family,
+				       unsigned int hmask,
+				       u8 dbits, u8 sbits)
+{
+	unsigned int h = 0;
+
+	switch (family) {
+	case AF_INET:
+		h = __xfrm4_dpref_spref_hash(daddr, saddr, dbits, sbits);
+		break;
+
+	case AF_INET6:
+		h = __xfrm6_dpref_spref_hash(daddr, saddr, dbits, sbits);
+		break;
+	}
+	h ^= (h >> 16);
+	return h & hmask;
+}
+
+struct hlist_head *xfrm_hash_alloc(unsigned int sz);
+void xfrm_hash_free(struct hlist_head *n, unsigned int sz);
+
+#endif /* _XFRM_HASH_H */