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udp: In udp_flow_src_port use random hash value if skb_get_hash fails

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In the unlikely event that skb_get_hash is unable to deduce a hash
in udp_flow_src_port we use a consistent random value instead.
This is specified in GRE/UDP draft section 3.2.1:
https://tools.ietf.org/html/draft-ietf-tsvwg-gre-in-udp-encap-04

Signed-off-by: Tom Herbert <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Tom Herbert 2015-02-24 09:17:31 -08:00 • committed by David S. Miller
commit 723b8e460d
2 changed files with 25 additions and 6 deletions
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10
net/ipv4/udp.c
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@ -2525,6 +2525,16 @@ void __init udp_table_init(struct udp_table *table, const char *name)
}
}
u32 udp_flow_hashrnd(void)
{
static u32 hashrnd __read_mostly;
net_get_random_once(&hashrnd, sizeof(hashrnd));
return hashrnd;
}
EXPORT_SYMBOL(udp_flow_hashrnd);
void __init udp_init(void)
{
unsigned long limit;