[PATCH iproute2 v3 0/3] improve lwtunnel route support

[PATCH iproute2 v3 0/3] improve lwtunnel route support

[Paolo Abeni]

This patch series try to improve the current route based
lwtunnel support in iproute2, namely adding support for the
COLLECT_METADATA flag in vxlan and gre link, and for ip6
encap type in lwtunnel.

Tunnel devices need to have the COLLECT_METADATA flag
set in order to be used for route based lwtunnel.

Changes from V1:
- the COLLECT_METADATA flag is now controlled via the 'external' keyword
- 'vni' and 'external' arguments are mutually exclusive for the vxlan link

Changes from V2:
- rebased

Paolo Abeni (3):
  vxlan: add support for collect metadata flag
  gre: add support for collect metadata flag
  lwtunnel: implement support for ip6 encap

 ip/iplink_vxlan.c     | 19 +++++++++--
 ip/iproute_lwtunnel.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 ip/link_gre.c         | 11 ++++++
 3 files changed, 119 insertions(+), 3 deletions(-)

-- 
1.8.3.1

[PATCH iproute2 v3 1/3] vxlan: add support for collect metadata flag

[Paolo Abeni]

This patch add support for IFLA_VXLAN_COLLECT_METADATA via the
'external' keyword to the vxlan link.

Also enforce mutual exclusion between 'vni' and 'external'.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 ip/iplink_vxlan.c | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/ip/iplink_vxlan.c b/ip/iplink_vxlan.c
index db29bf0..aa4d519 100644
--- a/ip/iplink_vxlan.c
+++ b/ip/iplink_vxlan.c
@@ -31,7 +31,7 @@ static void print_explain(FILE *f)
 	fprintf(f, "                 [ ageing SECONDS ] [ maxaddress NUMBER ]\n");
 	fprintf(f, "                 [ [no]udpcsum ] [ [no]udp6zerocsumtx ] [ [no]udp6zerocsumrx ]\n");
 	fprintf(f, "                 [ [no]remcsumtx ] [ [no]remcsumrx ]\n");
-	fprintf(f, "                 [ gbp ]\n");
+	fprintf(f, "                 [ [no]external ] [ gbp ]\n");
 	fprintf(f, "\n");
 	fprintf(f, "Where: VNI := 0-16777215\n");
 	fprintf(f, "       ADDR := { IP_ADDRESS | any }\n");
@@ -72,6 +72,7 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 	__u8 udp6zerocsumrx = 0;
 	__u8 remcsumtx = 0;
 	__u8 remcsumrx = 0;
+	__u8 metadata = 0;
 	__u8 gbp = 0;
 	int dst_port_set = 0;
 	struct ifla_vxlan_port_range range = { 0, 0 };
@@ -210,6 +211,10 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 			remcsumrx = 1;
 		} else if (!matches(*argv, "noremcsumrx")) {
 			remcsumrx = 0;
+		} else if (!matches(*argv, "external")) {
+			metadata = 1;
+		} else if (!matches(*argv, "noexternal")) {
+			metadata = 0;
 		} else if (!matches(*argv, "gbp")) {
 			gbp = 1;
 		} else if (matches(*argv, "help") == 0) {
@@ -223,7 +228,12 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 		argc--, argv++;
 	}
 
-	if (!vni_set) {
+	if (metadata && vni_set) {
+		fprintf(stderr, "vxlan: both 'external' and vni cannot be specified\n");
+		return -1;
+	}
+
+	if (!metadata && !vni_set) {
 		fprintf(stderr, "vxlan: missing virtual network identifier\n");
 		return -1;
 	}
@@ -272,6 +282,7 @@ static int vxlan_parse_opt(struct link_util *lu, int argc, char **argv,
 	addattr8(n, 1024, IFLA_VXLAN_UDP_ZERO_CSUM6_RX, udp6zerocsumrx);
 	addattr8(n, 1024, IFLA_VXLAN_REMCSUM_TX, remcsumtx);
 	addattr8(n, 1024, IFLA_VXLAN_REMCSUM_RX, remcsumrx);
+	addattr8(n, 1024, IFLA_VXLAN_COLLECT_METADATA, metadata);
 
 	if (noage)
 		addattr32(n, 1024, IFLA_VXLAN_AGEING, 0);
@@ -428,6 +439,10 @@ static void vxlan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 	    rta_getattr_u8(tb[IFLA_VXLAN_REMCSUM_RX]))
 		fputs("remcsumrx ", f);
 
+	if (tb[IFLA_VXLAN_COLLECT_METADATA] &&
+	    rta_getattr_u8(tb[IFLA_VXLAN_COLLECT_METADATA]))
+		fputs("external ", f);
+
 	if (tb[IFLA_VXLAN_GBP])
 		fputs("gbp ", f);
 }
-- 
1.8.3.1

[PATCH iproute2 v3 2/3] gre: add support for collect metadata flag

[Paolo Abeni]

This patch add support for IFLA_GRE_COLLECT_METADATA via the
'external' keyword to the gre link.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 ip/link_gre.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/ip/link_gre.c b/ip/link_gre.c
index 58f416c..c85741f 100644
--- a/ip/link_gre.c
+++ b/ip/link_gre.c
@@ -74,6 +74,7 @@ static int gre_parse_opt(struct link_util *lu, int argc, char **argv,
 	__u16 encapflags = 0;
 	__u16 encapsport = 0;
 	__u16 encapdport = 0;
+	__u8 metadata = 0;
 
 	if (!(n->nlmsg_flags & NLM_F_CREATE)) {
 		memset(&req, 0, sizeof(req));
@@ -148,6 +149,9 @@ get_failed:
 			encapsport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_SPORT]);
 		if (greinfo[IFLA_GRE_ENCAP_DPORT])
 			encapdport = rta_getattr_u16(greinfo[IFLA_GRE_ENCAP_DPORT]);
+
+		if (greinfo[IFLA_GRE_COLLECT_METADATA])
+			metadata = 1;
 	}
 
 	while (argc > 0) {
@@ -291,6 +295,8 @@ get_failed:
 			encapflags |= TUNNEL_ENCAP_FLAG_REMCSUM;
 		} else if (strcmp(*argv, "noencap-remcsum") == 0) {
 			encapflags |= ~TUNNEL_ENCAP_FLAG_REMCSUM;
+		} else if (strcmp(*argv, "external") == 0) {
+			metadata = 1;
 		} else
 			usage();
 		argc--; argv++;
@@ -325,6 +331,8 @@ get_failed:
 	addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
 	addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
 	addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
+	if (metadata)
+		addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
 
 	return 0;
 }
@@ -413,6 +421,9 @@ static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 	if (oflags & GRE_CSUM)
 		fputs("ocsum ", f);
 
+	if (tb[IFLA_GRE_COLLECT_METADATA])
+		fputs("external ", f);
+
 	if (tb[IFLA_GRE_ENCAP_TYPE] &&
 	    *(__u16 *)RTA_DATA(tb[IFLA_GRE_ENCAP_TYPE]) != TUNNEL_ENCAP_NONE) {
 		__u16 type = rta_getattr_u16(tb[IFLA_GRE_ENCAP_TYPE]);
-- 
1.8.3.1

[PATCH iproute2 v3 3/3] lwtunnel: implement support for ip6 encap

[Paolo Abeni]

Currently ip6 encap support for lwtunnel is missing.
This patch implement it, mostly duplicating the ipv4 parts.

Also be sure to insert a space after the encap type, when
showing lwtunnel, to avoid the tunnel type and the following
argument being merged into a single word.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
---
 ip/iproute_lwtunnel.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 91 insertions(+), 1 deletion(-)

diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
index 1243977..7074906 100644
--- a/ip/iproute_lwtunnel.c
+++ b/ip/iproute_lwtunnel.c
@@ -115,6 +115,37 @@ static void print_encap_ila(FILE *fp, struct rtattr *encap)
 	}
 }
 
+static void print_encap_ip6(FILE *fp, struct rtattr *encap)
+{
+	struct rtattr *tb[LWTUNNEL_IP6_MAX+1];
+	char abuf[256];
+
+	parse_rtattr_nested(tb, LWTUNNEL_IP6_MAX, encap);
+
+	if (tb[LWTUNNEL_IP6_ID])
+		fprintf(fp, "id %llu ", ntohll(rta_getattr_u64(tb[LWTUNNEL_IP6_ID])));
+
+	if (tb[LWTUNNEL_IP6_SRC])
+		fprintf(fp, "src %s ",
+			rt_addr_n2a(AF_INET6,
+				    RTA_PAYLOAD(tb[LWTUNNEL_IP6_SRC]),
+				    RTA_DATA(tb[LWTUNNEL_IP6_SRC]),
+				    abuf, sizeof(abuf)));
+
+	if (tb[LWTUNNEL_IP6_DST])
+		fprintf(fp, "dst %s ",
+			rt_addr_n2a(AF_INET6,
+				    RTA_PAYLOAD(tb[LWTUNNEL_IP6_DST]),
+				    RTA_DATA(tb[LWTUNNEL_IP6_DST]),
+				    abuf, sizeof(abuf)));
+
+	if (tb[LWTUNNEL_IP6_HOPLIMIT])
+		fprintf(fp, "hoplimit %d ", rta_getattr_u8(tb[LWTUNNEL_IP6_HOPLIMIT]));
+
+	if (tb[LWTUNNEL_IP6_TC])
+		fprintf(fp, "tc %d ", rta_getattr_u8(tb[LWTUNNEL_IP6_TC]));
+}
+
 void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
 			  struct rtattr *encap)
 {
@@ -125,7 +156,7 @@ void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
 
 	et = rta_getattr_u16(encap_type);
 
-	fprintf(fp, " encap %s", format_encap_type(et));
+	fprintf(fp, " encap %s ", format_encap_type(et));
 
 	switch (et) {
 	case LWTUNNEL_ENCAP_MPLS:
@@ -137,6 +168,9 @@ void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
 	case LWTUNNEL_ENCAP_ILA:
 		print_encap_ila(fp, encap);
 		break;
+	case LWTUNNEL_ENCAP_IP6:
+		print_encap_ip6(fp, encap);
+		break;
 	}
 }
 
@@ -233,6 +267,59 @@ static int parse_encap_ila(struct rtattr *rta, size_t len,
 	return 0;
 }
 
+static int parse_encap_ip6(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
+{
+	int id_ok = 0, dst_ok = 0, tos_ok = 0, ttl_ok = 0;
+	char **argv = *argvp;
+	int argc = *argcp;
+
+	while (argc > 0) {
+		if (strcmp(*argv, "id") == 0) {
+			__u64 id;
+			NEXT_ARG();
+			if (id_ok++)
+				duparg2("id", *argv);
+			if (get_u64(&id, *argv, 0))
+				invarg("\"id\" value is invalid\n", *argv);
+			rta_addattr64(rta, len, LWTUNNEL_IP6_ID, htonll(id));
+		} else if (strcmp(*argv, "dst") == 0) {
+			inet_prefix addr;
+			NEXT_ARG();
+			if (dst_ok++)
+				duparg2("dst", *argv);
+			get_addr(&addr, *argv, AF_INET6);
+			rta_addattr_l(rta, len, LWTUNNEL_IP6_DST, &addr.data, addr.bytelen);
+		} else if (strcmp(*argv, "tc") == 0) {
+			__u32 tc;
+			NEXT_ARG();
+			if (tos_ok++)
+				duparg2("tc", *argv);
+			if (rtnl_dsfield_a2n(&tc, *argv))
+				invarg("\"tc\" value is invalid\n", *argv);
+			rta_addattr8(rta, len, LWTUNNEL_IP6_TC, tc);
+		} else if (strcmp(*argv, "hoplimit") == 0) {
+			__u8 hoplimit;
+			NEXT_ARG();
+			if (ttl_ok++)
+				duparg2("hoplimit", *argv);
+			if (get_u8(&hoplimit, *argv, 0))
+				invarg("\"hoplimit\" value is invalid\n", *argv);
+			rta_addattr8(rta, len, LWTUNNEL_IP6_HOPLIMIT, hoplimit);
+		} else {
+			break;
+		}
+		argc--; argv++;
+	}
+
+	/* argv is currently the first unparsed argument,
+	 * but the lwt_parse_encap() caller will move to the next,
+	 * so step back */
+	*argcp = argc + 1;
+	*argvp = argv - 1;
+
+	return 0;
+}
+
 int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
 {
 	struct rtattr *nest;
@@ -262,6 +349,9 @@ int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp)
 	case LWTUNNEL_ENCAP_ILA:
 		parse_encap_ila(rta, len, &argc, &argv);
 		break;
+	case LWTUNNEL_ENCAP_IP6:
+		parse_encap_ip6(rta, len, &argc, &argv);
+		break;
 	default:
 		fprintf(stderr, "Error: unsupported encap type\n");
 		break;
-- 
1.8.3.1

Re: [PATCH iproute2 v3 0/3] improve lwtunnel route support

[Stephen Hemminger]

On Fri, 18 Dec 2015 10:50:35 +0100
Paolo Abeni <pabeni@redhat.com> wrote:

> This patch series try to improve the current route based
> lwtunnel support in iproute2, namely adding support for the
> COLLECT_METADATA flag in vxlan and gre link, and for ip6
> encap type in lwtunnel.
> 
> Tunnel devices need to have the COLLECT_METADATA flag
> set in order to be used for route based lwtunnel.
> 
> Changes from V1:
> - the COLLECT_METADATA flag is now controlled via the 'external' keyword
> - 'vni' and 'external' arguments are mutually exclusive for the vxlan link
> 
> Changes from V2:
> - rebased
> 
> Paolo Abeni (3):
>   vxlan: add support for collect metadata flag
>   gre: add support for collect metadata flag
>   lwtunnel: implement support for ip6 encap
> 
>  ip/iplink_vxlan.c     | 19 +++++++++--
>  ip/iproute_lwtunnel.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++-
>  ip/link_gre.c         | 11 ++++++
>  3 files changed, 119 insertions(+), 3 deletions(-)
> 

Applied thanks.