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authorTom Herbert <therbert@google.com>2015-02-24 17:17:31 (GMT)
committerDavid S. Miller <davem@davemloft.net>2015-02-27 21:00:01 (GMT)
commit723b8e460d87e957f251dc5764f4ab86af6ab44e (patch)
tree2453607eb05e7cdf3913fedfe55599641c6a66b1 /net/ipv4/udp.c
parentfed0a159c8c5e453d79d6a73897c576efea0a8a5 (diff)
downloadlinux-723b8e460d87e957f251dc5764f4ab86af6ab44e.tar.xz
udp: In udp_flow_src_port use random hash value if skb_get_hash fails
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 <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 97ef1f8b..0224f93 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -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;