[PATCH RFC net-next 2/7] net: Align ip_multipath_l3_keys and ip6_multipath_l3_keys

[David Ahern]

Symmetry is good and allows easy comparison that ipv4 and ipv6 are
doing the same thing. To that end, change ip_multipath_l3_keys to
set addresses at the end after the icmp compares, and move the
initialization of ipv6 flow keys to rt6_multipath_hash.

Signed-off-by: David Ahern <dsah...@gmail.com>
---
 net/ipv4/route.c | 20 +++++++++++---------
 net/ipv6/route.c |  4 ++--
 2 files changed, 13 insertions(+), 11 deletions(-)

diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 975c4b7cff07..228af793d154 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1763,37 +1763,39 @@ static void ip_multipath_l3_keys(const struct sk_buff 
*skb,
                                 struct flow_keys *hash_keys)
 {
        const struct iphdr *outer_iph = ip_hdr(skb);
+       const struct iphdr *key_iph = outer_iph;
        const struct iphdr *inner_iph;
        const struct icmphdr *icmph;
        struct iphdr _inner_iph;
        struct icmphdr _icmph;
 
-       hash_keys->addrs.v4addrs.src = outer_iph->saddr;
-       hash_keys->addrs.v4addrs.dst = outer_iph->daddr;
        if (likely(outer_iph->protocol != IPPROTO_ICMP))
-               return;
+               goto out;
 
        if (unlikely((outer_iph->frag_off & htons(IP_OFFSET)) != 0))
-               return;
+               goto out;
 
        icmph = skb_header_pointer(skb, outer_iph->ihl * 4, sizeof(_icmph),
                                   &_icmph);
        if (!icmph)
-               return;
+               goto out;
 
        if (icmph->type != ICMP_DEST_UNREACH &&
            icmph->type != ICMP_REDIRECT &&
            icmph->type != ICMP_TIME_EXCEEDED &&
            icmph->type != ICMP_PARAMETERPROB)
-               return;
+               goto out;
 
        inner_iph = skb_header_pointer(skb,
                                       outer_iph->ihl * 4 + sizeof(_icmph),
                                       sizeof(_inner_iph), &_inner_iph);
        if (!inner_iph)
-               return;
-       hash_keys->addrs.v4addrs.src = inner_iph->saddr;
-       hash_keys->addrs.v4addrs.dst = inner_iph->daddr;
+               goto out;
+
+       key_iph = inner_iph;
+out:
+       hash_keys->addrs.v4addrs.src = key_iph->saddr;
+       hash_keys->addrs.v4addrs.dst = key_iph->daddr;
 }
 
 /* if skb is set it will be used and fl4 can be NULL */
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 9dcfadddd800..baef18635f96 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -1812,8 +1812,6 @@ static void ip6_multipath_l3_keys(const struct sk_buff 
*skb,
 
        key_iph = inner_iph;
 out:
-       memset(keys, 0, sizeof(*keys));
-       keys->control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
        keys->addrs.v6addrs.src = key_iph->saddr;
        keys->addrs.v6addrs.dst = key_iph->daddr;
        keys->tags.flow_label = ip6_flowinfo(key_iph);
@@ -1826,6 +1824,8 @@ u32 rt6_multipath_hash(const struct flowi6 *fl6, const 
struct sk_buff *skb)
        struct flow_keys hash_keys;
 
        if (skb) {
+               memset(&hash_keys, 0, sizeof(hash_keys));
+               hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS;
                ip6_multipath_l3_keys(skb, &hash_keys);
                return flow_hash_from_keys(&hash_keys) >> 1;
        }
-- 
2.11.0