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| author |   Willy Tarreau <w@1wt.eu> | 2022-05-02 10:46:09 +0200 |
|---|---|---|
| committer |   Jakub Kicinski <kuba@kernel.org> | 2022-05-04 19:22:20 -0700 |
| commit | 9e9b70ae923baf2b5e8a0ea4fd0c8451801ac526 (patch) | |
| tree | 9c033e3c72e3a06f9e21db4470de505566af7049 /net/ipv4 | |
| parent | secure_seq: use the 64 bits of the siphash for port offset calculation (diff) | |
| download | linux-dev-9e9b70ae923baf2b5e8a0ea4fd0c8451801ac526.tar.xz linux-dev-9e9b70ae923baf2b5e8a0ea4fd0c8451801ac526.zip | |
tcp: use different parts of the port_offset for index and offset
Amit Klein suggests that we use different parts of port_offset for the
table's index and the port offset so that there is no direct relation
between them.
Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Cc: Moshe Kol <moshe.kol@mail.huji.ac.il>
Cc: Yossi Gilad <yossi.gilad@mail.huji.ac.il>
Cc: Amit Klein <aksecurity@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/inet_hashtables.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c index 9d24d9319f3d..29c701cd8312 100644 --- a/net/ipv4/inet_hashtables.c +++ b/net/ipv4/inet_hashtables.c @@ -777,7 +777,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row, net_get_random_once(table_perturb, sizeof(table_perturb)); index = hash_32(port_offset, INET_TABLE_PERTURB_SHIFT); - offset = READ_ONCE(table_perturb[index]) + port_offset; + offset = READ_ONCE(table_perturb[index]) + (port_offset >> 32); offset %= remaining; /* In first pass we try ports of @low parity. |