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![Eric Biggers](/assets/img/avatar_default.png)
<linux/cryptohash.h> sounds very generic and important, like it's the header to include if you're doing cryptographic hashing in the kernel. But actually it only includes the library implementation of the SHA-1 compression function (not even the full SHA-1). This should basically never be used anymore; SHA-1 is no longer considered secure, and there are much better ways to do cryptographic hashing in the kernel. Most files that include this header don't actually need it. So in preparation for removing it, remove all these unneeded includes of it. Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
194 lines
4.9 KiB
C
194 lines
4.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2016 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/cache.h>
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#include <linux/random.h>
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#include <linux/hrtimer.h>
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#include <linux/ktime.h>
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#include <linux/string.h>
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#include <linux/net.h>
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#include <linux/siphash.h>
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#include <net/secure_seq.h>
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#if IS_ENABLED(CONFIG_IPV6) || IS_ENABLED(CONFIG_INET)
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#include <linux/in6.h>
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#include <net/tcp.h>
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static siphash_key_t net_secret __read_mostly;
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static siphash_key_t ts_secret __read_mostly;
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static __always_inline void net_secret_init(void)
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{
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net_get_random_once(&net_secret, sizeof(net_secret));
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}
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static __always_inline void ts_secret_init(void)
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{
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net_get_random_once(&ts_secret, sizeof(ts_secret));
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}
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#endif
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#ifdef CONFIG_INET
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static u32 seq_scale(u32 seq)
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{
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/*
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* As close as possible to RFC 793, which
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* suggests using a 250 kHz clock.
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* Further reading shows this assumes 2 Mb/s networks.
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* For 10 Mb/s Ethernet, a 1 MHz clock is appropriate.
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* For 10 Gb/s Ethernet, a 1 GHz clock should be ok, but
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* we also need to limit the resolution so that the u32 seq
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* overlaps less than one time per MSL (2 minutes).
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* Choosing a clock of 64 ns period is OK. (period of 274 s)
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*/
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return seq + (ktime_get_real_ns() >> 6);
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}
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#endif
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#if IS_ENABLED(CONFIG_IPV6)
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u32 secure_tcpv6_ts_off(const struct net *net,
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const __be32 *saddr, const __be32 *daddr)
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{
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const struct {
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struct in6_addr saddr;
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struct in6_addr daddr;
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} __aligned(SIPHASH_ALIGNMENT) combined = {
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.saddr = *(struct in6_addr *)saddr,
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.daddr = *(struct in6_addr *)daddr,
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};
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if (net->ipv4.sysctl_tcp_timestamps != 1)
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return 0;
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ts_secret_init();
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return siphash(&combined, offsetofend(typeof(combined), daddr),
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&ts_secret);
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}
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EXPORT_SYMBOL(secure_tcpv6_ts_off);
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u32 secure_tcpv6_seq(const __be32 *saddr, const __be32 *daddr,
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__be16 sport, __be16 dport)
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{
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const struct {
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struct in6_addr saddr;
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struct in6_addr daddr;
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__be16 sport;
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__be16 dport;
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} __aligned(SIPHASH_ALIGNMENT) combined = {
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.saddr = *(struct in6_addr *)saddr,
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.daddr = *(struct in6_addr *)daddr,
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.sport = sport,
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.dport = dport
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};
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u32 hash;
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net_secret_init();
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hash = siphash(&combined, offsetofend(typeof(combined), dport),
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&net_secret);
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return seq_scale(hash);
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}
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EXPORT_SYMBOL(secure_tcpv6_seq);
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u32 secure_ipv6_port_ephemeral(const __be32 *saddr, const __be32 *daddr,
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__be16 dport)
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{
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const struct {
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struct in6_addr saddr;
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struct in6_addr daddr;
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__be16 dport;
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} __aligned(SIPHASH_ALIGNMENT) combined = {
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.saddr = *(struct in6_addr *)saddr,
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.daddr = *(struct in6_addr *)daddr,
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.dport = dport
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};
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net_secret_init();
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return siphash(&combined, offsetofend(typeof(combined), dport),
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&net_secret);
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}
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EXPORT_SYMBOL(secure_ipv6_port_ephemeral);
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#endif
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#ifdef CONFIG_INET
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u32 secure_tcp_ts_off(const struct net *net, __be32 saddr, __be32 daddr)
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{
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if (net->ipv4.sysctl_tcp_timestamps != 1)
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return 0;
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ts_secret_init();
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return siphash_2u32((__force u32)saddr, (__force u32)daddr,
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&ts_secret);
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}
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/* secure_tcp_seq_and_tsoff(a, b, 0, d) == secure_ipv4_port_ephemeral(a, b, d),
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* but fortunately, `sport' cannot be 0 in any circumstances. If this changes,
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* it would be easy enough to have the former function use siphash_4u32, passing
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* the arguments as separate u32.
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*/
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u32 secure_tcp_seq(__be32 saddr, __be32 daddr,
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__be16 sport, __be16 dport)
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{
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u32 hash;
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net_secret_init();
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hash = siphash_3u32((__force u32)saddr, (__force u32)daddr,
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(__force u32)sport << 16 | (__force u32)dport,
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&net_secret);
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return seq_scale(hash);
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}
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EXPORT_SYMBOL_GPL(secure_tcp_seq);
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u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport)
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{
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net_secret_init();
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return siphash_3u32((__force u32)saddr, (__force u32)daddr,
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(__force u16)dport, &net_secret);
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}
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EXPORT_SYMBOL_GPL(secure_ipv4_port_ephemeral);
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#endif
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#if IS_ENABLED(CONFIG_IP_DCCP)
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u64 secure_dccp_sequence_number(__be32 saddr, __be32 daddr,
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__be16 sport, __be16 dport)
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{
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u64 seq;
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net_secret_init();
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seq = siphash_3u32((__force u32)saddr, (__force u32)daddr,
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(__force u32)sport << 16 | (__force u32)dport,
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&net_secret);
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seq += ktime_get_real_ns();
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seq &= (1ull << 48) - 1;
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return seq;
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}
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EXPORT_SYMBOL(secure_dccp_sequence_number);
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#if IS_ENABLED(CONFIG_IPV6)
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u64 secure_dccpv6_sequence_number(__be32 *saddr, __be32 *daddr,
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__be16 sport, __be16 dport)
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{
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const struct {
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struct in6_addr saddr;
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struct in6_addr daddr;
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__be16 sport;
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__be16 dport;
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} __aligned(SIPHASH_ALIGNMENT) combined = {
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.saddr = *(struct in6_addr *)saddr,
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.daddr = *(struct in6_addr *)daddr,
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.sport = sport,
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.dport = dport
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};
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u64 seq;
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net_secret_init();
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seq = siphash(&combined, offsetofend(typeof(combined), dport),
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&net_secret);
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seq += ktime_get_real_ns();
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seq &= (1ull << 48) - 1;
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return seq;
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}
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EXPORT_SYMBOL(secure_dccpv6_sequence_number);
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#endif
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#endif
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