This introduces a new IP tunnel lightweight tunnel type which allows
to specify IP tunnel instructions per route. Only IPv4 is supported
at this point.
Signed-off-by: Thomas Graf <tg...@suug.ch>
---
drivers/net/vxlan.c | 10 +++-
include/net/dst_metadata.h | 12 ++++-
include/net/ip_tunnels.h | 7 ++-
include/uapi/linux/lwtunnel.h | 1 +
include/uapi/linux/rtnetlink.h | 15 ++++++
net/ipv4/ip_tunnel_core.c | 114 +++++++++++++++++++++++++++++++++++++++++
net/ipv4/route.c | 2 +-
net/openvswitch/vport.h | 1 +
8 files changed, 157 insertions(+), 5 deletions(-)
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
index 4dfb8a7..773b6bf 100644
--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1930,7 +1930,7 @@ static void vxlan_encap_bypass(struct sk_buff *skb,
struct vxlan_dev *src_vxlan,
static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
struct vxlan_rdst *rdst, bool did_rsc)
{
- struct ip_tunnel_info *info = skb_tunnel_info(skb);
+ struct ip_tunnel_info *info;
struct vxlan_dev *vxlan = netdev_priv(dev);
struct sock *sk = vxlan->vn_sock->sock->sk;
struct rtable *rt = NULL;
@@ -1947,6 +1947,9 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct
net_device *dev,
int err;
u32 flags = vxlan->flags;
+ /* FIXME: Support IPv6 */
+ info = skb_tunnel_info(skb, AF_INET);
+
if (rdst) {
dst_port = rdst->remote_port ? rdst->remote_port :
vxlan->dst_port;
vni = rdst->remote_vni;
@@ -2136,12 +2139,15 @@ tx_free:
static netdev_tx_t vxlan_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct vxlan_dev *vxlan = netdev_priv(dev);
- const struct ip_tunnel_info *info = skb_tunnel_info(skb);
+ const struct ip_tunnel_info *info;
struct ethhdr *eth;
bool did_rsc = false;
struct vxlan_rdst *rdst, *fdst = NULL;
struct vxlan_fdb *f;
+ /* FIXME: Support IPv6 */
+ info = skb_tunnel_info(skb, AF_INET);
+
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
diff --git a/include/net/dst_metadata.h b/include/net/dst_metadata.h
index e843937..fc03491 100644
--- a/include/net/dst_metadata.h
+++ b/include/net/dst_metadata.h
@@ -23,13 +23,23 @@ static inline struct metadata_dst *skb_metadata_dst(struct
sk_buff *skb)
return NULL;
}
-static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb)
+static inline struct ip_tunnel_info *skb_tunnel_info(struct sk_buff *skb,
+ int family)
{
struct metadata_dst *md_dst = skb_metadata_dst(skb);
+ struct rtable *rt;
if (md_dst)
return &md_dst->u.tun_info;
+ switch(family) {
+ case AF_INET:
+ rt = (struct rtable *)skb_dst(skb);
+ if (rt && rt->rt_lwtstate)
+ return lwt_tun_info(rt->rt_lwtstate);
+ break;
+ }
+
return NULL;
}
diff --git a/include/net/ip_tunnels.h b/include/net/ip_tunnels.h
index d11530f..0b7e18c 100644
--- a/include/net/ip_tunnels.h
+++ b/include/net/ip_tunnels.h
@@ -9,9 +9,9 @@
#include <net/dsfield.h>
#include <net/gro_cells.h>
#include <net/inet_ecn.h>
-#include <net/ip.h>
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
+#include <net/lwtunnel.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
@@ -298,6 +298,11 @@ static inline void *ip_tunnel_info_opts(struct
ip_tunnel_info *info, size_t n)
return info + 1;
}
+static inline struct ip_tunnel_info *lwt_tun_info(struct lwtunnel_state
*lwtstate)
+{
+ return (struct ip_tunnel_info *)lwtstate->data;
+}
+
#endif /* CONFIG_INET */
#endif /* __NET_IP_TUNNELS_H */
diff --git a/include/uapi/linux/lwtunnel.h b/include/uapi/linux/lwtunnel.h
index aa611d9..31377bb 100644
--- a/include/uapi/linux/lwtunnel.h
+++ b/include/uapi/linux/lwtunnel.h
@@ -6,6 +6,7 @@
enum lwtunnel_encap_types {
LWTUNNEL_ENCAP_NONE,
LWTUNNEL_ENCAP_MPLS,
+ LWTUNNEL_ENCAP_IP,
__LWTUNNEL_ENCAP_MAX,
};
diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h
index 0d3d3cc..47d24cb 100644
--- a/include/uapi/linux/rtnetlink.h
+++ b/include/uapi/linux/rtnetlink.h
@@ -286,6 +286,21 @@ enum rt_class_t {
/* Routing message attributes */
+enum ip_tunnel_t {
+ IP_TUN_UNSPEC,
+ IP_TUN_ID,
+ IP_TUN_DST,
+ IP_TUN_SRC,
+ IP_TUN_TTL,
+ IP_TUN_TOS,
+ IP_TUN_SPORT,
+ IP_TUN_DPORT,
+ IP_TUN_FLAGS,
+ __IP_TUN_MAX,
+};
+
+#define IP_TUN_MAX (__IP_TUN_MAX - 1)
+
enum rtattr_type_t {
RTA_UNSPEC,
RTA_DST,
diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 6a51a71..f4f2100 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -190,3 +190,117 @@ struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct
net_device *dev,
return tot;
}
EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
+
+static const struct nla_policy ip_tun_policy[IP_TUN_MAX + 1] = {
+ [IP_TUN_ID] = { .type = NLA_U64 },
+ [IP_TUN_DST] = { .type = NLA_U32 },
+ [IP_TUN_SRC] = { .type = NLA_U32 },
+ [IP_TUN_TTL] = { .type = NLA_U8 },
+ [IP_TUN_TOS] = { .type = NLA_U8 },
+ [IP_TUN_SPORT] = { .type = NLA_U16 },
+ [IP_TUN_DPORT] = { .type = NLA_U16 },
+ [IP_TUN_FLAGS] = { .type = NLA_U16 },
+};
+
+static int ip_tun_build_state(struct net_device *dev, struct nlattr *attr,
+ struct lwtunnel_state **ts)
+{
+ struct ip_tunnel_info *tun_info;
+ struct lwtunnel_state *new_state;
+ struct nlattr *tb[IP_TUN_MAX+1];
+ int err;
+
+ err = nla_parse_nested(tb, IP_TUN_MAX, attr, ip_tun_policy);
+ if (err < 0)
+ return err;
+
+ new_state = lwtunnel_state_alloc(sizeof(*tun_info));
+ if (!new_state)
+ return -ENOMEM;
+
+ new_state->type = LWTUNNEL_ENCAP_IP;
+
+ tun_info = lwt_tun_info(new_state);
+
+ if (tb[IP_TUN_ID])
+ tun_info->key.tun_id = nla_get_u64(tb[IP_TUN_ID]);
+
+ if (tb[IP_TUN_DST])
+ tun_info->key.ipv4_dst = nla_get_be32(tb[IP_TUN_DST]);
+
+ if (tb[IP_TUN_SRC])
+ tun_info->key.ipv4_src = nla_get_be32(tb[IP_TUN_SRC]);
+
+ if (tb[IP_TUN_TTL])
+ tun_info->key.ipv4_ttl = nla_get_u8(tb[IP_TUN_TTL]);
+
+ if (tb[IP_TUN_TOS])
+ tun_info->key.ipv4_tos = nla_get_u8(tb[IP_TUN_TOS]);
+
+ if (tb[IP_TUN_SPORT])
+ tun_info->key.tp_src = nla_get_be16(tb[IP_TUN_SPORT]);
+
+ if (tb[IP_TUN_DPORT])
+ tun_info->key.tp_dst = nla_get_be16(tb[IP_TUN_DPORT]);
+
+ if (tb[IP_TUN_FLAGS])
+ tun_info->key.tun_flags = nla_get_u16(tb[IP_TUN_FLAGS]);
+
+ tun_info->mode = IP_TUNNEL_INFO_TX;
+ tun_info->options = NULL;
+ tun_info->options_len = 0;
+
+ *ts = new_state;
+
+ return 0;
+}
+
+static int ip_tun_fill_encap_info(struct sk_buff *skb,
+ struct lwtunnel_state *lwtstate)
+{
+ struct ip_tunnel_info *tun_info = lwt_tun_info(lwtstate);
+
+ if (nla_put_u64(skb, IP_TUN_ID, tun_info->key.tun_id) ||
+ nla_put_be32(skb, IP_TUN_DST, tun_info->key.ipv4_dst) ||
+ nla_put_be32(skb, IP_TUN_SRC, tun_info->key.ipv4_src) ||
+ nla_put_u8(skb, IP_TUN_TOS, tun_info->key.ipv4_tos) ||
+ nla_put_u8(skb, IP_TUN_TTL, tun_info->key.ipv4_ttl) ||
+ nla_put_u16(skb, IP_TUN_SPORT, tun_info->key.tp_src) ||
+ nla_put_u16(skb, IP_TUN_DPORT, tun_info->key.tp_dst) ||
+ nla_put_u16(skb, IP_TUN_FLAGS, tun_info->key.tun_flags))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int ip_tun_encap_nlsize(struct lwtunnel_state *lwtstate)
+{
+ return nla_total_size(8) /* IP_TUN_ID */
+ + nla_total_size(4) /* IP_TUN_DST */
+ + nla_total_size(4) /* IP_TUN_SRC */
+ + nla_total_size(1) /* IP_TUN_TOS */
+ + nla_total_size(1) /* IP_TUN_TTL */
+ + nla_total_size(2) /* IP_TUN_SPORT */
+ + nla_total_size(2) /* IP_TUN_DPORT */
+ + nla_total_size(2); /* IP_TUN_FLAGS */
+}
+
+static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
+ .build_state = ip_tun_build_state,
+ .fill_encap = ip_tun_fill_encap_info,
+ .get_encap_size = ip_tun_encap_nlsize,
+};
+
+static int __init ip_tunnel_core_init(void)
+{
+ lwtunnel_encap_add_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
+
+ return 0;
+}
+module_init(ip_tunnel_core_init);
+
+static void __exit ip_tunnel_core_exit(void)
+{
+ lwtunnel_encap_del_ops(&ip_tun_lwt_ops, LWTUNNEL_ENCAP_IP);
+}
+module_exit(ip_tunnel_core_exit);
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index bf84164c..af8c7cd 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -1694,7 +1694,7 @@ static int ip_route_input_slow(struct sk_buff *skb,
__be32 daddr, __be32 saddr,
by fib_lookup.
*/
- tun_info = skb_tunnel_info(skb);
+ tun_info = skb_tunnel_info(skb, AF_INET);
if (tun_info && tun_info->mode == IP_TUNNEL_INFO_RX)
fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id;
skb_dst_drop(skb);
diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
index 4750fb6..75d6824 100644
--- a/net/openvswitch/vport.h
+++ b/net/openvswitch/vport.h
@@ -27,6 +27,7 @@
#include <linux/skbuff.h>
#include <linux/spinlock.h>
#include <linux/u64_stats_sync.h>
+#include <net/route.h>
#include "datapath.h"
--
2.4.3
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