This patch implements the receive side to support RFC 6438 which is to use the flow label as an ECMP hash. If an IPv6 flow label is set in a packet we can use this as input for computing an L4-hash. There should be no need to parse any transport headers in this case.
Unified · Split
| @@ -80,6 +80,8 @@ ip: · 79 unmodified lines | ||
| 80 | 80 | case htons(ETH_P_IPV6): { |
| 81 | 81 | const struct ipv6hdr *iph; |
| 82 | 82 | struct ipv6hdr _iph; |
| 83 | + __be32 flow_label; | |
| 84 | + | |
| 83 | 85 | ipv6: |
| 84 | 86 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); |
| 85 | 87 | if (!iph) |
| @@ -89,6 +91,21 @@ ipv6: · 3 unmodified lines | ||
| 89 | 91 | flow->src = (__force __be32)ipv6_addr_hash(&iph->saddr); |
| 90 | 92 | flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr); |
| 91 | 93 | nhoff += sizeof(struct ipv6hdr); |
| 94 | + | |
| 95 | + flow_label = ip6_flowlabel(iph); | |
| 96 | + if (flow_label) { | |
| 97 | + /* Awesome, IPv6 packet has a flow label so we can | |
| 98 | + * use that to represent the ports without any | |
| 99 | + * further dissection. | |
| 100 | + */ | |
| 101 | + flow->n_proto = proto; | |
| 102 | + flow->ip_proto = ip_proto; | |
| 103 | + flow->ports = flow_label; | |
| 104 | + flow->thoff = (u16)nhoff; | |
| 105 | + | |
| 106 | + return true; | |
| 107 | + } | |
| 108 | + | |
| 92 | 109 | break; |
| 93 | 110 | } |
| 94 | 111 | case htons(ETH_P_8021AD): |