From b8f1a55639e6a76cfd274cc7de76eafac9a15ca9 Mon Sep 17 00:00:00 2001 From: Tom Herbert Date: Tue, 1 Jul 2014 21:32:39 -0700 Subject: [PATCH] udp: Add function to make source port for UDP tunnels This patch adds udp_flow_src_port function which is intended to be a common function that UDP tunnel implementations call to set the source port. The source port is chosen so that a hash over the outer headers (IP addresses and UDP ports) acts as suitable hash for the flow of the encapsulated packet. In this manner, UDP encapsulation works with RSS and ECMP based wrt the inner flow. Signed-off-by: Tom Herbert Signed-off-by: David S. Miller --- include/net/udp.h | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/include/net/udp.h b/include/net/udp.h index 68a1fefe3dfe..70f941368ace 100644 --- a/include/net/udp.h +++ b/include/net/udp.h @@ -176,6 +176,35 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum, int (*)(const struct sock *, const struct sock *), unsigned int hash2_nulladdr); +static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb, + int min, int max, bool use_eth) +{ + u32 hash; + + if (min >= max) { + /* Use default range */ + inet_get_local_port_range(net, &min, &max); + } + + hash = skb_get_hash(skb); + if (unlikely(!hash) && use_eth) { + /* Can't find a normal hash, caller has indicated an Ethernet + * packet so use that to compute a hash. + */ + hash = jhash(skb->data, 2 * ETH_ALEN, + (__force u32) skb->protocol); + } + + /* Since this is being sent on the wire obfuscate hash a bit + * to minimize possbility that any useful information to an + * attacker is leaked. Only upper 16 bits are relevant in the + * computation for 16 bit port value. + */ + hash ^= hash << 16; + + return htons((((u64) hash * (max - min)) >> 32) + min); +} + /* net/ipv4/udp.c */ void udp_v4_early_demux(struct sk_buff *skb); int udp_get_port(struct sock *sk, unsigned short snum, -- 2.30.2