diff options
Diffstat (limited to 'include/net/ipv6.h')
| -rw-r--r-- | include/net/ipv6.h | 59 |
1 files changed, 46 insertions, 13 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 3e334b33ef3a..c02c1c03363a 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -707,36 +707,69 @@ static inline void iph_to_flow_copy_v6addrs(struct flow_keys *flow, } #if IS_ENABLED(CONFIG_IPV6) + +/* Sysctl settings for net ipv6.auto_flowlabels */ +#define IP6_AUTO_FLOW_LABEL_OFF 0 +#define IP6_AUTO_FLOW_LABEL_OPTOUT 1 +#define IP6_AUTO_FLOW_LABEL_OPTIN 2 +#define IP6_AUTO_FLOW_LABEL_FORCED 3 + +#define IP6_AUTO_FLOW_LABEL_MAX IP6_AUTO_FLOW_LABEL_FORCED + +#define IP6_DEFAULT_AUTO_FLOW_LABELS IP6_AUTO_FLOW_LABEL_OFF + static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, __be32 flowlabel, bool autolabel, struct flowi6 *fl6) { - if (!flowlabel && (autolabel || net->ipv6.sysctl.auto_flowlabels)) { - u32 hash; + u32 hash; - hash = skb_get_hash_flowi6(skb, fl6); + if (flowlabel || + net->ipv6.sysctl.auto_flowlabels == IP6_AUTO_FLOW_LABEL_OFF || + (!autolabel && + net->ipv6.sysctl.auto_flowlabels != IP6_AUTO_FLOW_LABEL_FORCED)) + return flowlabel; - /* 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; + hash = skb_get_hash_flowi6(skb, fl6); - flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; + /* 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. + */ + rol32(hash, 16); - if (net->ipv6.sysctl.flowlabel_state_ranges) - flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; - } + flowlabel = (__force __be32)hash & IPV6_FLOWLABEL_MASK; + + if (net->ipv6.sysctl.flowlabel_state_ranges) + flowlabel |= IPV6_FLOWLABEL_STATELESS_FLAG; return flowlabel; } + +static inline int ip6_default_np_autolabel(struct net *net) +{ + switch (net->ipv6.sysctl.auto_flowlabels) { + case IP6_AUTO_FLOW_LABEL_OFF: + case IP6_AUTO_FLOW_LABEL_OPTIN: + default: + return 0; + case IP6_AUTO_FLOW_LABEL_OPTOUT: + case IP6_AUTO_FLOW_LABEL_FORCED: + return 1; + } +} #else static inline void ip6_set_txhash(struct sock *sk) { } static inline __be32 ip6_make_flowlabel(struct net *net, struct sk_buff *skb, - __be32 flowlabel, bool autolabel) + __be32 flowlabel, bool autolabel, + struct flowi6 *fl6) { return flowlabel; } +static inline int ip6_default_np_autolabel(struct net *net) +{ + return 0; +} #endif |