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![Eric Dumazet](/assets/img/avatar_default.png)
make C=2 CF=-D__CHECK_ENDIAN__ net/core/secure_seq.o net/core/secure_seq.c:157:50: warning: restricted __be32 degrades to integer Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
173 lines
4.1 KiB
C
173 lines
4.1 KiB
C
#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/cryptohash.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 <net/secure_seq.h>
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#if IS_ENABLED(CONFIG_IPV6) || IS_ENABLED(CONFIG_INET)
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#define NET_SECRET_SIZE (MD5_MESSAGE_BYTES / 4)
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static u32 net_secret[NET_SECRET_SIZE] ____cacheline_aligned;
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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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#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_sequence_number(const __be32 *saddr, const __be32 *daddr,
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__be16 sport, __be16 dport)
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{
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u32 secret[MD5_MESSAGE_BYTES / 4];
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u32 hash[MD5_DIGEST_WORDS];
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u32 i;
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net_secret_init();
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memcpy(hash, saddr, 16);
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for (i = 0; i < 4; i++)
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secret[i] = net_secret[i] + (__force u32)daddr[i];
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secret[4] = net_secret[4] +
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(((__force u16)sport << 16) + (__force u16)dport);
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for (i = 5; i < MD5_MESSAGE_BYTES / 4; i++)
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secret[i] = net_secret[i];
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md5_transform(hash, secret);
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return seq_scale(hash[0]);
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}
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EXPORT_SYMBOL(secure_tcpv6_sequence_number);
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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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u32 secret[MD5_MESSAGE_BYTES / 4];
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u32 hash[MD5_DIGEST_WORDS];
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u32 i;
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net_secret_init();
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memcpy(hash, saddr, 16);
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for (i = 0; i < 4; i++)
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secret[i] = net_secret[i] + (__force u32) daddr[i];
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secret[4] = net_secret[4] + (__force u32)dport;
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for (i = 5; i < MD5_MESSAGE_BYTES / 4; i++)
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secret[i] = net_secret[i];
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md5_transform(hash, secret);
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return hash[0];
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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_sequence_number(__be32 saddr, __be32 daddr,
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__be16 sport, __be16 dport)
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{
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u32 hash[MD5_DIGEST_WORDS];
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net_secret_init();
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hash[0] = (__force u32)saddr;
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hash[1] = (__force u32)daddr;
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hash[2] = ((__force u16)sport << 16) + (__force u16)dport;
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hash[3] = net_secret[15];
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md5_transform(hash, net_secret);
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return seq_scale(hash[0]);
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}
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u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport)
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{
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u32 hash[MD5_DIGEST_WORDS];
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net_secret_init();
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hash[0] = (__force u32)saddr;
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hash[1] = (__force u32)daddr;
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hash[2] = (__force u32)dport ^ net_secret[14];
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hash[3] = net_secret[15];
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md5_transform(hash, net_secret);
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return hash[0];
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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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u32 hash[MD5_DIGEST_WORDS];
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u64 seq;
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net_secret_init();
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hash[0] = (__force u32)saddr;
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hash[1] = (__force u32)daddr;
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hash[2] = ((__force u16)sport << 16) + (__force u16)dport;
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hash[3] = net_secret[15];
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md5_transform(hash, net_secret);
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seq = hash[0] | (((u64)hash[1]) << 32);
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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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u32 secret[MD5_MESSAGE_BYTES / 4];
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u32 hash[MD5_DIGEST_WORDS];
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u64 seq;
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u32 i;
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net_secret_init();
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memcpy(hash, saddr, 16);
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for (i = 0; i < 4; i++)
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secret[i] = net_secret[i] + (__force u32)daddr[i];
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secret[4] = net_secret[4] +
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(((__force u16)sport << 16) + (__force u16)dport);
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for (i = 5; i < MD5_MESSAGE_BYTES / 4; i++)
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secret[i] = net_secret[i];
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md5_transform(hash, secret);
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seq = hash[0] | (((u64)hash[1]) << 32);
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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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