Automatically generate flow labels for IPv6 packets on transmit.
The flow label is computed based on skb_get_hash. The flow label will
only automatically be set when it is zero otherwise (i.e. flow label
manager hasn't set one). This supports the transmit side functionality
of RFC 6438.
Added an IPv6 sysctl auto_flowlabels to enable/disable this behavior
system wide, and added IPV6_AUTOFLOWLABEL socket option to enable this
functionality per socket.
By default, auto flowlabels are disabled to avoid possible conflicts
with flow label manager, however if this feature proves useful we
may want to enable it by default.
It should also be noted that FreeBSD has already implemented automatic
flow labels (including the sysctl and socket option). In FreeBSD,
automatic flow labels default to enabled.
Performance impact:
Running super_netperf with 200 flows for TCP_RR and UDP_RR for
IPv6. Note that in UDP case, __skb_get_hash will be called for
every packet with explains slight regression. In the TCP case
the hash is saved in the socket so there is no regression.
Automatic flow labels disabled:
TCP_RR:
86.53% CPU utilization
127/195/322 90/95/99% latencies
1.40498e+06 tps
UDP_RR:
90.70% CPU utilization
118/168/243 90/95/99% latencies
1.50309e+06 tps
Automatic flow labels enabled:
TCP_RR:
85.90% CPU utilization
128/199/337 90/95/99% latencies
1.40051e+06
UDP_RR
92.61% CPU utilization
115/164/236 90/95/99% latencies
1.4687e+06
Signed-off-by: Tom Herbert <therbert@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
FALSE: disabled
Default: TRUE
+auto_flowlabels - BOOLEAN
+ Automatically generate flow labels based based on a flow hash
+ of the packet. This allows intermediate devices, such as routers,
+ to idenfify packet flows for mechanisms like Equal Cost Multipath
+ Routing (see RFC 6438).
+ TRUE: enabled
+ FALSE: disabled
+ Default: false
+
anycast_src_echo_reply - BOOLEAN
Controls the use of anycast addresses as source addresses for ICMPv6
echo reply
* 010: prefer public address
* 100: prefer care-of address
*/
- dontfrag:1;
+ dontfrag:1,
+ autoflowlabel:1;
__u8 min_hopcount;
__u8 tclass;
__be32 rcv_flowinfo;
sk->sk_txhash = flow_hash_from_keys(&keys);
}
+static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb,
+ __be32 flowlabel, bool autolabel)
+{
+ if (!flowlabel && (autolabel || net->ipv6.sysctl.auto_flowlabels)) {
+ __be32 hash;
+
+ hash = skb_get_hash(skb);
+
+ /* 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 lower 20 bits are relevant.
+ */
+ hash ^= hash >> 12;
+
+ flowlabel = hash & IPV6_FLOWLABEL_MASK;
+ }
+
+ return flowlabel;
+}
+
/*
* Header manipulation
*/
int ip6_rt_mtu_expires;
int ip6_rt_min_advmss;
int flowlabel_consistency;
+ int auto_flowlabels;
int icmpv6_time;
int anycast_src_echo_reply;
int fwmark_reflect;
#if 0 /* not yet */
#define IPV6_USE_MIN_MTU 63
#endif
+#define IPV6_AUTOFLOWLABEL 64
/*
* Netfilter (1)
net->ipv6.sysctl.bindv6only = 0;
net->ipv6.sysctl.icmpv6_time = 1*HZ;
net->ipv6.sysctl.flowlabel_consistency = 1;
+ net->ipv6.sysctl.auto_flowlabels = 0;
atomic_set(&net->ipv6.rt_genid, 0);
err = ipv6_init_mibs(net);
* Push down and install the IP header.
*/
ipv6h = ipv6_hdr(skb);
- ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
+ ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
+ ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
ipv6h->hop_limit = tunnel->parms.hop_limit;
ipv6h->nexthdr = proto;
ipv6h->saddr = fl6->saddr;
struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
__be16 *p = (__be16 *)(ipv6h+1);
- ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
+ ip6_flow_hdr(ipv6h, 0,
+ ip6_make_flowlabel(dev_net(dev), skb,
+ t->fl.u.ip6.flowlabel, false));
ipv6h->hop_limit = t->parms.hop_limit;
ipv6h->nexthdr = NEXTHDR_GRE;
ipv6h->saddr = t->parms.laddr;
if (hlimit < 0)
hlimit = ip6_dst_hoplimit(dst);
- ip6_flow_hdr(hdr, tclass, fl6->flowlabel);
+ ip6_flow_hdr(hdr, tclass, ip6_make_flowlabel(net, skb, fl6->flowlabel,
+ np->autoflowlabel));
hdr->payload_len = htons(seg_len);
hdr->nexthdr = proto;
skb_reset_network_header(skb);
hdr = ipv6_hdr(skb);
- ip6_flow_hdr(hdr, np->cork.tclass, fl6->flowlabel);
+ ip6_flow_hdr(hdr, np->cork.tclass,
+ ip6_make_flowlabel(net, skb, fl6->flowlabel,
+ np->autoflowlabel));
hdr->hop_limit = np->cork.hop_limit;
hdr->nexthdr = proto;
hdr->saddr = fl6->saddr;
skb_push(skb, sizeof(struct ipv6hdr));
skb_reset_network_header(skb);
ipv6h = ipv6_hdr(skb);
- ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
+ ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield),
+ ip6_make_flowlabel(net, skb, fl6->flowlabel, false));
ipv6h->hop_limit = t->parms.hop_limit;
ipv6h->nexthdr = proto;
ipv6h->saddr = fl6->saddr;
np->dontfrag = valbool;
retv = 0;
break;
+ case IPV6_AUTOFLOWLABEL:
+ np->autoflowlabel = valbool;
+ retv = 0;
+ break;
}
release_sock(sk);
val = np->dontfrag;
break;
+ case IPV6_AUTOFLOWLABEL:
+ val = np->autoflowlabel;
+ break;
+
default:
return -ENOPROTOOPT;
}
.mode = 0644,
.proc_handler = proc_dointvec
},
+ {
+ .procname = "auto_flowlabels",
+ .data = &init_net.ipv6.sysctl.auto_flowlabels,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec
+ },
{
.procname = "fwmark_reflect",
.data = &init_net.ipv6.sysctl.fwmark_reflect,
ipv6_table[0].data = &net->ipv6.sysctl.bindv6only;
ipv6_table[1].data = &net->ipv6.sysctl.anycast_src_echo_reply;
ipv6_table[2].data = &net->ipv6.sysctl.flowlabel_consistency;
+ ipv6_table[3].data = &net->ipv6.sysctl.auto_flowlabels;
ipv6_route_table = ipv6_route_sysctl_init(net);
if (!ipv6_route_table)