Date: Tue, 6 Dec 2016 23:52:56 +0000 (UTC) From: "Andrey V. Elsukov" <ae@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r309660 - head/sys/netpfil/ipfw Message-ID: <201612062352.uB6NquYS045803@repo.freebsd.org>
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Author: ae Date: Tue Dec 6 23:52:56 2016 New Revision: 309660 URL: https://svnweb.freebsd.org/changeset/base/309660 Log: Convert result of hash_packet6() into host byte order. For IPv4 similar function uses addresses and ports in host byte order, but for IPv6 it used network byte order. This led to very bad hash distribution for IPv6 flows. Now the result looks similar to IPv4. Reported by: olivier MFC after: 1 week Sponsored by: Yandex LLC Modified: head/sys/netpfil/ipfw/ip_fw_dynamic.c Modified: head/sys/netpfil/ipfw/ip_fw_dynamic.c ============================================================================== --- head/sys/netpfil/ipfw/ip_fw_dynamic.c Tue Dec 6 23:43:04 2016 (r309659) +++ head/sys/netpfil/ipfw/ip_fw_dynamic.c Tue Dec 6 23:52:56 2016 (r309660) @@ -256,9 +256,8 @@ hash_packet6(struct ipfw_flow_id *id) i = (id->dst_ip6.__u6_addr.__u6_addr32[2]) ^ (id->dst_ip6.__u6_addr.__u6_addr32[3]) ^ (id->src_ip6.__u6_addr.__u6_addr32[2]) ^ - (id->src_ip6.__u6_addr.__u6_addr32[3]) ^ - (id->dst_port) ^ (id->src_port); - return i; + (id->src_ip6.__u6_addr.__u6_addr32[3]); + return ntohl(i); } #endif @@ -277,9 +276,9 @@ hash_packet(struct ipfw_flow_id *id, int i = hash_packet6(id); else #endif /* INET6 */ - i = (id->dst_ip) ^ (id->src_ip) ^ (id->dst_port) ^ (id->src_port); - i &= (buckets - 1); - return i; + i = (id->dst_ip) ^ (id->src_ip); + i ^= (id->dst_port) ^ (id->src_port); + return (i & (buckets - 1)); } #if 0
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