diff options
Diffstat (limited to 'include/net/ipv6.h')
| -rw-r--r-- | include/net/ipv6.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 574337fe72dd..4308f2ada8b3 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -19,6 +19,7 @@ #include <net/if_inet6.h> #include <net/ndisc.h> #include <net/flow.h> +#include <net/flow_keys.h> #include <net/snmp.h> #define SIN6_LEN_RFC2133 24 @@ -684,6 +685,40 @@ static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, return hlimit; } +static inline void ip6_set_txhash(struct sock *sk) +{ + struct inet_sock *inet = inet_sk(sk); + struct ipv6_pinfo *np = inet6_sk(sk); + struct flow_keys keys; + + keys.src = (__force __be32)ipv6_addr_hash(&np->saddr); + keys.dst = (__force __be32)ipv6_addr_hash(&sk->sk_v6_daddr); + keys.port16[0] = inet->inet_sport; + keys.port16[1] = inet->inet_dport; + + 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 */ |