ip6_tunnel: Allow policy-based routing through tunnels
This feature allows the administrator to set an fwmark for
packets traversing a tunnel. This allows the use of independent
routing tables for tunneled packets without the use of iptables.
Signed-off-by: Craig Gallek <kraig@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 75fac93..ad15d38 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -1256,6 +1256,8 @@ ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
& IPV6_TCLASS_MASK;
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
fl6.flowi6_mark = skb->mark;
+ else
+ fl6.flowi6_mark = t->parms.fwmark;
}
fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
@@ -1338,6 +1340,8 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
fl6.flowlabel |= ip6_flowlabel(ipv6h);
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
fl6.flowi6_mark = skb->mark;
+ else
+ fl6.flowi6_mark = t->parms.fwmark;
}
fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
@@ -1467,6 +1471,7 @@ ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
t->parms.flowinfo = p->flowinfo;
t->parms.link = p->link;
t->parms.proto = p->proto;
+ t->parms.fwmark = p->fwmark;
dst_cache_reset(&t->dst_cache);
ip6_tnl_link_config(t);
return 0;
@@ -1918,6 +1923,9 @@ static void ip6_tnl_netlink_parms(struct nlattr *data[],
if (data[IFLA_IPTUN_COLLECT_METADATA])
parms->collect_md = true;
+
+ if (data[IFLA_IPTUN_FWMARK])
+ parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
}
static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
@@ -2054,6 +2062,8 @@ static size_t ip6_tnl_get_size(const struct net_device *dev)
nla_total_size(2) +
/* IFLA_IPTUN_COLLECT_METADATA */
nla_total_size(0) +
+ /* IFLA_IPTUN_FWMARK */
+ nla_total_size(4) +
0;
}
@@ -2069,7 +2079,8 @@ static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
- nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto))
+ nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
+ nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
goto nla_put_failure;
if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
@@ -2081,6 +2092,7 @@ static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
if (parm->collect_md)
if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
goto nla_put_failure;
+
return 0;
nla_put_failure:
@@ -2109,6 +2121,7 @@ static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
[IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
[IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
[IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
+ [IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
};
static struct rtnl_link_ops ip6_link_ops __read_mostly = {