[PATCH v4 0/2] Introduce MPLS over GRE

[PATCH v4 0/2] Introduce MPLS over GRE

[Amine Kherbouche]

This series introduces the MPLS over GRE encapsulation (RFC 4023).

Various applications of MPLS make use of label stacks with multiple
entries.  In some cases, it is possible to replace the top label of
the stack with an IP-based encapsulation, thereby, it is possible for
two LSRs that are adjacent on an LSP to be separated by an IP network,
even if that IP network does not provide MPLS.

Changes in v4:
  - Bring back mpls_forward() function exportation patch.
  - Move back mpls_gre_rcv() to gre module file and wrap it under
    ifdef.

Changes in v3:
  - remove mpls_forward() function exportation patch.
  - wrap efficiently mpls iptunnel add/del functions and dependent
    function/structure.
  - move mpls_gre_rcv to af_mpls.c file and export it.
  - remove unnecessary functions.
 
Changes in v2:
  - wrap ip tunnel functions under ifdef in mpls file.
  - fix indentation.
  - check return code.

An example of configuration:


         node1                LER1                       LER2                node2
        +-----+             +------+                   +------+             +-----+
        |     |             |      |                   |      |             |     |
        |     |             |      |p3  GRE tunnel   p4|      |             |     |
        |     |p1         p2|      +-------------------+      |p5         p6|     |
        |     +-------------+      +-------------------+      +------------+|     |
        |     |10.100.0.0/24|      |                   |      |10.200.0.0/24|     |
        |     |fd00:100::/64|      |  10.125.0.0/24    |      |fd00:200::/64|     |
        |     |             |      |  fd00:125::/64    |      |             |     |
        |     |             |      |                   |      |             |     |
        |     |             |      |                   |      |             |     |
        |     |             |      |                   |      |             |     |
        |     |             |      |                   |      |             |     |
        +-----+             +------+                   +------+             +-----+


		###	node1	###

ip link set p1 up
ip addr add 10.100.0.1/24 dev p1

		###	LER1	###

ip link set p2 up
ip addr add 10.100.0.2/24 dev p2

ip link set p3 up
ip addr add 10.125.0.1/24 dev p3

modprobe mpls_router
sysctl -w net.mpls.conf.p2.input=1
sysctl -w net.mpls.conf.p3.input=1
sysctl -w net.mpls.platform_labels=1000

ip link add gre1 type gre ttl 64 local 10.125.0.1 remote 10.125.0.2 dev p3
ip link set dev gre1 up

ip -M route add 111 as 222 dev gre1
ip -M route add 555 as 666 via inet 10.100.0.1 dev p2

		###	LER2	###

ip link set p5 up
ip addr add 10.200.0.2/24 dev p5

ip link set p4 up
ip addr add 10.125.0.2/24 dev p4

modprobe mpls_router
sysctl -w net.mpls.conf.p4.input=1
sysctl -w net.mpls.conf.p5.input=1
sysctl -w net.mpls.platform_labels=1000

ip link add gre1 type gre ttl 64 local 10.125.0.2 remote 10.125.0.1 dev p4
ip link set dev gre1 up

ip -M route add 444 as 555 dev gre1
ip -M route add 222 as 333 via inet 10.200.0.1 dev p5

		###	node2	###

ip link set p6 up
ip addr add 10.200.0.1/24 dev p6


Now using this scapy to forge and send packets from the port p1 of node1:

p = Ether(src='de:ed:01:0c:41:09', dst='de:ed:01:2f:3b:ba')
p /= MPLS(s=1, ttl=64, label=111)/Raw(load='\xde')
sendp(p, iface="p1", count=20, inter=0.1)

Amine Kherbouche (2):
  expose stack entry function
  ip_tunnel: add mpls over gre encapsulation

 include/linux/mpls.h           |  4 ++++
 include/net/gre.h              |  1 +
 include/uapi/linux/if_tunnel.h |  1 +
 net/ipv4/gre_demux.c           | 27 +++++++++++++++++++++++++++
 net/ipv4/ip_gre.c              |  3 +++
 net/ipv6/ip6_gre.c             |  3 +++
 net/mpls/af_mpls.c             | 41 +++++++++++++++++++++++++++++++++++++++--
 7 files changed, 78 insertions(+), 2 deletions(-)

-- 
2.1.4

[PATCH v4 1/2] expose stack entry function

[Amine Kherbouche]

Exporting mpls_forward() function to be able to be called from elsewhere
such as MPLSoverGRE in the next commit.

Signed-off-by: Amine Kherbouche <amine.kherbouche@6wind.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
---
 include/linux/mpls.h | 4 ++++
 net/mpls/af_mpls.c   | 5 +++--
 2 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/mpls.h b/include/linux/mpls.h
index 384fb22..b0579ab 100644
--- a/include/linux/mpls.h
+++ b/include/linux/mpls.h
@@ -2,10 +2,14 @@
 #define _LINUX_MPLS_H
 
 #include <uapi/linux/mpls.h>
+#include <linux/netdevice.h>
 
 #define MPLS_TTL_MASK		(MPLS_LS_TTL_MASK >> MPLS_LS_TTL_SHIFT)
 #define MPLS_BOS_MASK		(MPLS_LS_S_MASK >> MPLS_LS_S_SHIFT)
 #define MPLS_TC_MASK		(MPLS_LS_TC_MASK >> MPLS_LS_TC_SHIFT)
 #define MPLS_LABEL_MASK		(MPLS_LS_LABEL_MASK >> MPLS_LS_LABEL_SHIFT)
 
+int mpls_forward(struct sk_buff *skb, struct net_device *dev,
+		 struct packet_type *pt, struct net_device *orig_dev);
+
 #endif  /* _LINUX_MPLS_H */
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index c5b9ce4..36ea2ad 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -307,8 +307,8 @@ static bool mpls_egress(struct net *net, struct mpls_route *rt,
 	return success;
 }
 
-static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
-			struct packet_type *pt, struct net_device *orig_dev)
+int mpls_forward(struct sk_buff *skb, struct net_device *dev,
+		 struct packet_type *pt, struct net_device *orig_dev)
 {
 	struct net *net = dev_net(dev);
 	struct mpls_shim_hdr *hdr;
@@ -442,6 +442,7 @@ static int mpls_forward(struct sk_buff *skb, struct net_device *dev,
 	kfree_skb(skb);
 	return NET_RX_DROP;
 }
+EXPORT_SYMBOL(mpls_forward);
 
 static struct packet_type mpls_packet_type __read_mostly = {
 	.type = cpu_to_be16(ETH_P_MPLS_UC),
-- 
2.1.4

[PATCH v4 2/2] ip_tunnel: add mpls over gre encapsulation

[Amine Kherbouche]

This commit introduces the MPLSoGRE support (RFC 4023), using ip tunnel
API.

Encap:
  - Add a new iptunnel type mpls.
  - Share tx path: gre type mpls loaded from skb->protocol.

Decap:
  - pull gre hdr and call mpls_forward().

Signed-off-by: Amine Kherbouche <amine.kherbouche@6wind.com>
Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
---
 include/net/gre.h              |  1 +
 include/uapi/linux/if_tunnel.h |  1 +
 net/ipv4/gre_demux.c           | 27 +++++++++++++++++++++++++++
 net/ipv4/ip_gre.c              |  3 +++
 net/ipv6/ip6_gre.c             |  3 +++
 net/mpls/af_mpls.c             | 36 ++++++++++++++++++++++++++++++++++++
 6 files changed, 71 insertions(+)

diff --git a/include/net/gre.h b/include/net/gre.h
index d25d836..aa3c4d3 100644
--- a/include/net/gre.h
+++ b/include/net/gre.h
@@ -35,6 +35,7 @@ struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
 				       u8 name_assign_type);
 int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
 		     bool *csum_err, __be16 proto, int nhs);
+int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len);
 
 static inline int gre_calc_hlen(__be16 o_flags)
 {
diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h
index 2e52088..a2f48c0 100644
--- a/include/uapi/linux/if_tunnel.h
+++ b/include/uapi/linux/if_tunnel.h
@@ -84,6 +84,7 @@ enum tunnel_encap_types {
 	TUNNEL_ENCAP_NONE,
 	TUNNEL_ENCAP_FOU,
 	TUNNEL_ENCAP_GUE,
+	TUNNEL_ENCAP_MPLS,
 };
 
 #define TUNNEL_ENCAP_FLAG_CSUM		(1<<0)
diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c
index b798862..40484a3 100644
--- a/net/ipv4/gre_demux.c
+++ b/net/ipv4/gre_demux.c
@@ -23,6 +23,9 @@
 #include <linux/netdevice.h>
 #include <linux/if_tunnel.h>
 #include <linux/spinlock.h>
+#if IS_ENABLED(CONFIG_MPLS)
+#include <linux/mpls.h>
+#endif
 #include <net/protocol.h>
 #include <net/gre.h>
 
@@ -122,6 +125,30 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
 }
 EXPORT_SYMBOL(gre_parse_header);
 
+#if IS_ENABLED(CONFIG_MPLS)
+int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len)
+{
+	if (unlikely(!pskb_may_pull(skb, gre_hdr_len)))
+		goto drop;
+
+	/* Pop GRE hdr and reset the skb */
+	skb_pull(skb, gre_hdr_len);
+	skb_reset_network_header(skb);
+
+	return mpls_forward(skb, skb->dev, NULL, NULL);
+drop:
+	kfree_skb(skb);
+	return NET_RX_DROP;
+}
+#else
+int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len)
+{
+	kfree_skb(skb);
+	return NET_RX_DROP;
+}
+#endif
+EXPORT_SYMBOL(mpls_gre_rcv);
+
 static int gre_rcv(struct sk_buff *skb)
 {
 	const struct gre_protocol *proto;
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 9cee986..7a50e4f 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -412,6 +412,9 @@ static int gre_rcv(struct sk_buff *skb)
 			return 0;
 	}
 
+	if (unlikely(tpi.proto == htons(ETH_P_MPLS_UC)))
+		return mpls_gre_rcv(skb, hdr_len);
+
 	if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
 		return 0;
 
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index c82d41e..440efb1 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -476,6 +476,9 @@ static int gre_rcv(struct sk_buff *skb)
 	if (hdr_len < 0)
 		goto drop;
 
+	if (unlikely(tpi.proto == htons(ETH_P_MPLS_UC)))
+		return mpls_gre_rcv(skb, hdr_len);
+
 	if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
 		goto drop;
 
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
index 36ea2ad..4274243 100644
--- a/net/mpls/af_mpls.c
+++ b/net/mpls/af_mpls.c
@@ -16,6 +16,7 @@
 #include <net/arp.h>
 #include <net/ip_fib.h>
 #include <net/netevent.h>
+#include <net/ip_tunnels.h>
 #include <net/netns/generic.h>
 #if IS_ENABLED(CONFIG_IPV6)
 #include <net/ipv6.h>
@@ -39,6 +40,36 @@ static int one = 1;
 static int label_limit = (1 << 20) - 1;
 static int ttl_max = 255;
 
+#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
+size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
+{
+	return sizeof(struct mpls_shim_hdr);
+}
+
+static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
+	.encap_hlen	= ipgre_mpls_encap_hlen,
+};
+
+static int ipgre_tunnel_encap_add_mpls_ops(void)
+{
+	return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
+}
+
+static void ipgre_tunnel_encap_del_mpls_ops(void)
+{
+	ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
+}
+#else
+static int ipgre_tunnel_encap_add_mpls_ops(void)
+{
+	return 0;
+}
+
+static void ipgre_tunnel_encap_del_mpls_ops(void)
+{
+}
+#endif
+
 static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
 		       struct nlmsghdr *nlh, struct net *net, u32 portid,
 		       unsigned int nlm_flags);
@@ -2486,6 +2517,10 @@ static int __init mpls_init(void)
 		      0);
 	rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf,
 		      mpls_netconf_dump_devconf, 0);
+	err = ipgre_tunnel_encap_add_mpls_ops();
+	if (err)
+		pr_err("Can't add mpls over gre tunnel ops\n");
+
 	err = 0;
 out:
 	return err;
@@ -2503,6 +2538,7 @@ static void __exit mpls_exit(void)
 	dev_remove_pack(&mpls_packet_type);
 	unregister_netdevice_notifier(&mpls_dev_notifier);
 	unregister_pernet_subsys(&mpls_net_ops);
+	ipgre_tunnel_encap_del_mpls_ops();
 }
 module_exit(mpls_exit);
 
-- 
2.1.4

Re: [PATCH v4 1/2] expose stack entry function

[Nicolas Dichtel]

Le 28/09/2017 à 11:34, Amine Kherbouche a écrit :
> Exporting mpls_forward() function to be able to be called from elsewhere
> such as MPLSoverGRE in the next commit.

I'm nitpicking, but the commit title is too generic. What about something like
'mpls: export mpls_forward()'?

When parsing history, the user knows precisely what is done in the commit
without openning it.


Regards,
Nicolas

Re: [PATCH v4 1/2] expose stack entry function

[David Miller]

From: Amine Kherbouche <amine.kherbouche@6wind.com>
Date: Thu, 28 Sep 2017 11:34:19 +0200

> Exporting mpls_forward() function to be able to be called from elsewhere
> such as MPLSoverGRE in the next commit.
> 
> Signed-off-by: Amine Kherbouche <amine.kherbouche@6wind.com>
> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>

You need to resubmit this series with this patch having a proper
subsystem prefix in the Subject line, as pointed out by another
reviewer.

Thanks.

Re: [PATCH v4 2/2] ip_tunnel: add mpls over gre encapsulation

[Tom Herbert]

On Thu, Sep 28, 2017 at 2:34 AM, Amine Kherbouche
<amine.kherbouche@6wind.com> wrote:
> This commit introduces the MPLSoGRE support (RFC 4023), using ip tunnel
> API.
>
> Encap:
>   - Add a new iptunnel type mpls.
>   - Share tx path: gre type mpls loaded from skb->protocol.
>
> Decap:
>   - pull gre hdr and call mpls_forward().
>
> Signed-off-by: Amine Kherbouche <amine.kherbouche@6wind.com>
> Acked-by: Roopa Prabhu <roopa@cumulusnetworks.com>
> ---
>  include/net/gre.h              |  1 +
>  include/uapi/linux/if_tunnel.h |  1 +
>  net/ipv4/gre_demux.c           | 27 +++++++++++++++++++++++++++
>  net/ipv4/ip_gre.c              |  3 +++
>  net/ipv6/ip6_gre.c             |  3 +++
>  net/mpls/af_mpls.c             | 36 ++++++++++++++++++++++++++++++++++++
>  6 files changed, 71 insertions(+)
>
> diff --git a/include/net/gre.h b/include/net/gre.h
> index d25d836..aa3c4d3 100644
> --- a/include/net/gre.h
> +++ b/include/net/gre.h
> @@ -35,6 +35,7 @@ struct net_device *gretap_fb_dev_create(struct net *net, const char *name,
>                                        u8 name_assign_type);
>  int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
>                      bool *csum_err, __be16 proto, int nhs);
> +int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len);
>
>  static inline int gre_calc_hlen(__be16 o_flags)
>  {
> diff --git a/include/uapi/linux/if_tunnel.h b/include/uapi/linux/if_tunnel.h
> index 2e52088..a2f48c0 100644
> --- a/include/uapi/linux/if_tunnel.h
> +++ b/include/uapi/linux/if_tunnel.h
> @@ -84,6 +84,7 @@ enum tunnel_encap_types {
>         TUNNEL_ENCAP_NONE,
>         TUNNEL_ENCAP_FOU,
>         TUNNEL_ENCAP_GUE,
> +       TUNNEL_ENCAP_MPLS,
>  };
>
>  #define TUNNEL_ENCAP_FLAG_CSUM         (1<<0)
> diff --git a/net/ipv4/gre_demux.c b/net/ipv4/gre_demux.c
> index b798862..40484a3 100644
> --- a/net/ipv4/gre_demux.c
> +++ b/net/ipv4/gre_demux.c
> @@ -23,6 +23,9 @@
>  #include <linux/netdevice.h>
>  #include <linux/if_tunnel.h>
>  #include <linux/spinlock.h>
> +#if IS_ENABLED(CONFIG_MPLS)
> +#include <linux/mpls.h>
> +#endif
>  #include <net/protocol.h>
>  #include <net/gre.h>
>
> @@ -122,6 +125,30 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
>  }
>  EXPORT_SYMBOL(gre_parse_header);
>
> +#if IS_ENABLED(CONFIG_MPLS)
> +int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len)
> +{
> +       if (unlikely(!pskb_may_pull(skb, gre_hdr_len)))
> +               goto drop;
> +
> +       /* Pop GRE hdr and reset the skb */
> +       skb_pull(skb, gre_hdr_len);
> +       skb_reset_network_header(skb);
> +

I don't see why MPLS/GRE needs to be a special case in gre_rcv. Can't
we just follow the normal processing patch which calls the proto ops
handler for the protocol in the GRE header? Also, if protocol specific
code is added to rcv function that most likely means that we need to
update the related offloads also (grant it that MPLS doesn't support
GRO but it looks like it supports GSO). Additionally, we'd need to
consider if flow dissector needs a similar special case (I will point
out that my recently posted patches there eliminated TEB as the one
special case in GRE dissection).

Thanks,
Tom

> +       return mpls_forward(skb, skb->dev, NULL, NULL);
> +drop:
> +       kfree_skb(skb);
> +       return NET_RX_DROP;
> +}
> +#else
> +int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len)
> +{
> +       kfree_skb(skb);
> +       return NET_RX_DROP;
> +}
> +#endif
> +EXPORT_SYMBOL(mpls_gre_rcv);
> +
>  static int gre_rcv(struct sk_buff *skb)
>  {
>         const struct gre_protocol *proto;
> diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
> index 9cee986..7a50e4f 100644
> --- a/net/ipv4/ip_gre.c
> +++ b/net/ipv4/ip_gre.c
> @@ -412,6 +412,9 @@ static int gre_rcv(struct sk_buff *skb)
>                         return 0;
>         }
>
> +       if (unlikely(tpi.proto == htons(ETH_P_MPLS_UC)))
> +               return mpls_gre_rcv(skb, hdr_len);
> +
>         if (ipgre_rcv(skb, &tpi, hdr_len) == PACKET_RCVD)
>                 return 0;
>
> diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
> index c82d41e..440efb1 100644
> --- a/net/ipv6/ip6_gre.c
> +++ b/net/ipv6/ip6_gre.c
> @@ -476,6 +476,9 @@ static int gre_rcv(struct sk_buff *skb)
>         if (hdr_len < 0)
>                 goto drop;
>
> +       if (unlikely(tpi.proto == htons(ETH_P_MPLS_UC)))
> +               return mpls_gre_rcv(skb, hdr_len);
> +
>         if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
>                 goto drop;
>
> diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c
> index 36ea2ad..4274243 100644
> --- a/net/mpls/af_mpls.c
> +++ b/net/mpls/af_mpls.c
> @@ -16,6 +16,7 @@
>  #include <net/arp.h>
>  #include <net/ip_fib.h>
>  #include <net/netevent.h>
> +#include <net/ip_tunnels.h>
>  #include <net/netns/generic.h>
>  #if IS_ENABLED(CONFIG_IPV6)
>  #include <net/ipv6.h>
> @@ -39,6 +40,36 @@ static int one = 1;
>  static int label_limit = (1 << 20) - 1;
>  static int ttl_max = 255;
>
> +#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
> +size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
> +{
> +       return sizeof(struct mpls_shim_hdr);
> +}
> +
> +static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
> +       .encap_hlen     = ipgre_mpls_encap_hlen,
> +};
> +
> +static int ipgre_tunnel_encap_add_mpls_ops(void)
> +{
> +       return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
> +}
> +
> +static void ipgre_tunnel_encap_del_mpls_ops(void)
> +{
> +       ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
> +}
> +#else
> +static int ipgre_tunnel_encap_add_mpls_ops(void)
> +{
> +       return 0;
> +}
> +
> +static void ipgre_tunnel_encap_del_mpls_ops(void)
> +{
> +}
> +#endif
> +
>  static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
>                        struct nlmsghdr *nlh, struct net *net, u32 portid,
>                        unsigned int nlm_flags);
> @@ -2486,6 +2517,10 @@ static int __init mpls_init(void)
>                       0);
>         rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf,
>                       mpls_netconf_dump_devconf, 0);
> +       err = ipgre_tunnel_encap_add_mpls_ops();
> +       if (err)
> +               pr_err("Can't add mpls over gre tunnel ops\n");
> +
>         err = 0;
>  out:
>         return err;
> @@ -2503,6 +2538,7 @@ static void __exit mpls_exit(void)
>         dev_remove_pack(&mpls_packet_type);
>         unregister_netdevice_notifier(&mpls_dev_notifier);
>         unregister_pernet_subsys(&mpls_net_ops);
> +       ipgre_tunnel_encap_del_mpls_ops();
>  }
>  module_exit(mpls_exit);
>
> --
> 2.1.4
>

Re: [PATCH v4 2/2] ip_tunnel: add mpls over gre encapsulation

[kbuild test robot]

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Hi Amine,

[auto build test ERROR on net/master]
[also build test ERROR on v4.14-rc2 next-20170929]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Amine-Kherbouche/expose-stack-entry-function/20171001-013434
config: x86_64-rhel (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> ERROR: "mpls_forward" [net/ipv4/gre.ko] undefined!

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 40101 bytes --]

Re: [PATCH v4 2/2] ip_tunnel: add mpls over gre encapsulation

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 967 bytes --]

Hi Amine,

[auto build test ERROR on net/master]
[also build test ERROR on v4.14-rc2 next-20170929]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Amine-Kherbouche/expose-stack-entry-function/20171001-013434
config: i386-randconfig-sb0-10010708 (attached as .config)
compiler: gcc-5 (Debian 5.4.1-2) 5.4.1 20160904
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   net/mpls/af_mpls.o: In function `mpls_exit':
>> af_mpls.c:(.exit.text+0x40): undefined reference to `ip_tunnel_encap_del_ops'
   net/mpls/af_mpls.o: In function `mpls_init':
>> af_mpls.c:(.init.text+0xb9): undefined reference to `ip_tunnel_encap_add_ops'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 30405 bytes --]

Re: [PATCH v4 2/2] ip_tunnel: add mpls over gre encapsulation

[Amine Kherbouche]

On 09/29/2017 06:11 AM, Tom Herbert wrote:
>> > @@ -122,6 +125,30 @@ int gre_parse_header(struct sk_buff *skb, struct tnl_ptk_info *tpi,
>> >  }
>> >  EXPORT_SYMBOL(gre_parse_header);
>> >
>> > +#if IS_ENABLED(CONFIG_MPLS)
>> > +int mpls_gre_rcv(struct sk_buff *skb, int gre_hdr_len)
>> > +{
>> > +       if (unlikely(!pskb_may_pull(skb, gre_hdr_len)))
>> > +               goto drop;
>> > +
>> > +       /* Pop GRE hdr and reset the skb */
>> > +       skb_pull(skb, gre_hdr_len);
>> > +       skb_reset_network_header(skb);
>> > +
> I don't see why MPLS/GRE needs to be a special case in gre_rcv. Can't
> we just follow the normal processing patch which calls the proto ops
> handler for the protocol in the GRE header? Also, if protocol specific
> code is added to rcv function that most likely means that we need to
> update the related offloads also (grant it that MPLS doesn't support
> GRO but it looks like it supports GSO). Additionally, we'd need to
> consider if flow dissector needs a similar special case (I will point
> out that my recently posted patches there eliminated TEB as the one
> special case in GRE dissection).
>
> Thanks,
> Tom

Hi Tom,

Thanks for the feedback, I think this is the best way to do it, I'll do 
a v6 asap.

Regards,
Amine