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Message-Id: <aa224b640e7bc1b7d54051d4b20f968fc861e689.1573654929.git.martin.varghese@nokia.com>
Date: Thu, 14 Nov 2019 17:24:55 +0530
From: Martin Varghese <martinvarghesenokia@...il.com>
To: netdev@...r.kernel.org, stephen@...workplumber.org,
scott.drennan@...ia.com, jbenc@...hat.com,
martin.varghese@...ia.com
Subject: [PATCH v2 net-next 1/1] Bareudp device support
From: Martin Varghese <martin.varghese@...ia.com>
The Bareudp device provides a generic L3 encapsulation for tunnelling
different protocols like MPLS,IP,NSH, etc. inside a UDP tunnel.
Signed-off-by: Martin Varghese <martin.varghese@...ia.com>
---
Changes in v2:
- Man Pages added.
include/uapi/linux/if_link.h | 12 ++++
ip/Makefile | 2 +-
ip/iplink.c | 2 +-
ip/iplink_bareudp.c | 157 +++++++++++++++++++++++++++++++++++++++++++
man/man8/ip-link.8.in | 38 +++++++++++
5 files changed, 209 insertions(+), 2 deletions(-)
create mode 100644 ip/iplink_bareudp.c
diff --git a/include/uapi/linux/if_link.h b/include/uapi/linux/if_link.h
index d36919f..a3a876d 100644
--- a/include/uapi/linux/if_link.h
+++ b/include/uapi/linux/if_link.h
@@ -578,6 +578,18 @@ enum ifla_geneve_df {
GENEVE_DF_MAX = __GENEVE_DF_END - 1,
};
+/* Bareudp section */
+enum {
+ IFLA_BAREUDP_UNSPEC,
+ IFLA_BAREUDP_PORT,
+ IFLA_BAREUDP_ETHERTYPE,
+ IFLA_BAREUDP_SRCPORT_MIN,
+ IFLA_BAREUDP_EXTMODE,
+ __IFLA_BAREUDP_MAX
+};
+
+#define IFLA_BAREUDP_MAX (__IFLA_BAREUDP_MAX - 1)
+
/* PPP section */
enum {
IFLA_PPP_UNSPEC,
diff --git a/ip/Makefile b/ip/Makefile
index 5ab78d7..784d852 100644
--- a/ip/Makefile
+++ b/ip/Makefile
@@ -11,7 +11,7 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
iplink_bridge.o iplink_bridge_slave.o ipfou.o iplink_ipvlan.o \
iplink_geneve.o iplink_vrf.o iproute_lwtunnel.o ipmacsec.o ipila.o \
ipvrf.o iplink_xstats.o ipseg6.o iplink_netdevsim.o iplink_rmnet.o \
- ipnexthop.o
+ ipnexthop.o iplink_bareudp.o
RTMONOBJ=rtmon.o
diff --git a/ip/iplink.c b/ip/iplink.c
index 212a088..325fd0f 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -122,7 +122,7 @@ void iplink_usage(void)
" bridge | bond | team | ipoib | ip6tnl | ipip | sit | vxlan |\n"
" gre | gretap | erspan | ip6gre | ip6gretap | ip6erspan |\n"
" vti | nlmon | team_slave | bond_slave | bridge_slave |\n"
- " ipvlan | ipvtap | geneve | vrf | macsec | netdevsim | rmnet |\n"
+ " ipvlan | ipvtap | geneve | bareudp | vrf | macsec | netdevsim | rmnet |\n"
" xfrm }\n");
}
exit(-1);
diff --git a/ip/iplink_bareudp.c b/ip/iplink_bareudp.c
new file mode 100644
index 0000000..443f882
--- /dev/null
+++ b/ip/iplink_bareudp.c
@@ -0,0 +1,157 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <stdio.h>
+
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+#define BAREUDP_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0)
+
+static void print_explain(FILE *f)
+{
+ fprintf(f,
+ "Usage: ........ bareudp dstport PORT\n"
+ " ethertype ETHERTYPE|PROTOCOL\n"
+ " [extmode]\n"
+ " [srcportmin SRCPORTMIN]\n"
+ "\n"
+ "Where: PORT := 0-65535\n"
+ " : ETHERTYPE|PROTOCOL := 0-65535|ip|mpls\n"
+ " : SRCPORTMIN : = 0-65535\n"
+ );
+}
+
+static void explain(void)
+{
+ print_explain(stderr);
+}
+
+static void check_duparg(__u64 *attrs, int type, const char *key,
+ const char *argv)
+{
+ if (!BAREUDP_ATTRSET(*attrs, type)) {
+ *attrs |= (1L << type);
+ return;
+ }
+ duparg2(key, argv);
+}
+
+static int bareudp_parse_opt(struct link_util *lu, int argc, char **argv,
+ struct nlmsghdr *n)
+{
+ __u16 dstport = 0;
+ __u16 ethertype = 0;
+ __u16 srcportmin = 0;
+ bool extmode = 0;
+ __u64 attrs = 0;
+
+ while (argc > 0) {
+ if (!matches(*argv, "dstport")) {
+ NEXT_ARG();
+ check_duparg(&attrs, IFLA_BAREUDP_PORT, "dstport",
+ *argv);
+ if (get_u16(&dstport, *argv, 0))
+ invarg("dstport", *argv);
+ } else if (!matches(*argv, "extmode")) {
+ check_duparg(&attrs, IFLA_BAREUDP_EXTMODE,
+ *argv, *argv);
+ extmode = true;
+ } else if (!matches(*argv, "ethertype")) {
+ NEXT_ARG();
+ check_duparg(&attrs, IFLA_BAREUDP_ETHERTYPE,
+ *argv, *argv);
+ if (!matches(*argv, "mpls")) {
+ ethertype = 0x8847;
+ check_duparg(&attrs, IFLA_BAREUDP_EXTMODE,
+ *argv, *argv);
+ extmode = true;
+ } else if (!matches(*argv, "ip")) {
+ ethertype = 0x0800;
+ check_duparg(&attrs, IFLA_BAREUDP_EXTMODE,
+ *argv, *argv);
+ extmode = true;
+ } else {
+ if (get_u16(ðertype, *argv, 0))
+ invarg("ethertype", *argv);
+ }
+ } else if (!matches(*argv, "srcportmin")) {
+ NEXT_ARG();
+ check_duparg(&attrs, IFLA_BAREUDP_SRCPORT_MIN,
+ *argv, *argv);
+ if (get_u16(&srcportmin, *argv, 0))
+ invarg("srcportmin", *argv);
+
+ } else if (matches(*argv, "help") == 0) {
+ explain();
+ return -1;
+ } else {
+ fprintf(stderr, "bareudp: unknown command \"%s\"?\n", *argv);
+ explain();
+ return -1;
+ }
+ argc--, argv++;
+ }
+
+ if (!dstport || !ethertype) {
+ fprintf(stderr, "bareudp : Missing mandatory params\n");
+ return -1;
+ }
+
+ if (dstport)
+ addattr16(n, 1024, IFLA_BAREUDP_PORT, htons(dstport));
+ if (ethertype)
+ addattr16(n, 1024, IFLA_BAREUDP_ETHERTYPE, htons(ethertype));
+ if (extmode)
+ addattr(n, 1024, IFLA_BAREUDP_EXTMODE);
+ if (srcportmin)
+ addattr16(n, 1024, IFLA_BAREUDP_PORT, srcportmin);
+
+ return 0;
+}
+
+static void bareudp_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+
+ if (!tb)
+ return;
+
+ if (tb[IFLA_BAREUDP_PORT])
+ print_uint(PRINT_ANY, "port", "dstport %u ",
+ rta_getattr_be16(tb[IFLA_BAREUDP_PORT]));
+
+ if (tb[IFLA_BAREUDP_ETHERTYPE])
+ print_uint(PRINT_ANY, "port", "ethertype %u ",
+ rta_getattr_be16(tb[IFLA_BAREUDP_ETHERTYPE]));
+ if (tb[IFLA_BAREUDP_SRCPORT_MIN])
+ print_uint(PRINT_ANY, "port", "srcportmin %u ",
+ rta_getattr_u16(tb[IFLA_BAREUDP_SRCPORT_MIN]));
+
+ if (tb[IFLA_BAREUDP_EXTMODE]) {
+ if (is_json_context()) {
+ print_bool(PRINT_JSON,
+ "extmode",
+ NULL,
+ rta_getattr_u8(tb[IFLA_BAREUDP_EXTMODE]));
+ } else {
+ if (!rta_getattr_u8(tb[IFLA_BAREUDP_EXTMODE]))
+ fputs("no", f);
+ fputs("extmode ", f);
+ }
+
+ }
+}
+
+static void bareudp_print_help(struct link_util *lu, int argc, char **argv,
+ FILE *f)
+{
+ print_explain(f);
+}
+
+struct link_util bareudp_link_util = {
+ .id = "bareudp",
+ .maxattr = IFLA_BAREUDP_MAX,
+ .parse_opt = bareudp_parse_opt,
+ .print_opt = bareudp_print_opt,
+ .print_help = bareudp_print_help,
+};
diff --git a/man/man8/ip-link.8.in b/man/man8/ip-link.8.in
index a8ae72d..0dd2054 100644
--- a/man/man8/ip-link.8.in
+++ b/man/man8/ip-link.8.in
@@ -223,6 +223,7 @@ ip-link \- network device configuration
.BR ipvtap " |"
.BR lowpan " |"
.BR geneve " |"
+.BR bareudp " |"
.BR vrf " |"
.BR macsec " |"
.BR netdevsim " |"
@@ -345,6 +346,9 @@ Link types:
.BR geneve
- GEneric NEtwork Virtualization Encapsulation
.sp
+.BR bareudp
+- Bare UDP L3 encapsulation support
+.sp
.BR macsec
- Interface for IEEE 802.1AE MAC Security (MACsec)
.sp
@@ -1283,6 +1287,40 @@ options.
.in -8
.TP
+Bareudp Type Support
+For a link of type
+.I Bareudp
+the following additional arguments are supported:
+
+.BI "ip link add " DEVICE
+.BI type " bareudp " dstport " PORT " ethertype " ETHERTYPE"
+[
+.RB [ no ] extmode
+][
+.BI srcportmin " SRCPORTMIN "
+]
+
+.in +8
+.sp
+.BI dstport " PORT "
+- Selects the destination port for the UDP tunnel.
+
+.sp
+.BI ethertype " ETHERTYPE "
+- Selects the ethertype of the L3 protocol being tunnelled.
+
+.sp
+.RB [ no ] extmode
+- Enables special handling for certain ethertypes ( Supported only for ethertypes 0x8847 & 0x0800)
+Extmode when configured with ethertype 0x8847(MPLS Unicast) enables the device to tunnel ethertype
+0x8848 (MPLS multicast) also.Extmode when configured with ethertype 0x0800 (IPV4) enables the device
+to tunnel 0x86dd (IPv6) also.
+
+.sp
+.BI srcportmin " SRCPORTMIN "
+- selecs the lowest value of the UDP tunnel source port range.
+
+.TP
MACVLAN and MACVTAP Type Support
For a link of type
.I MACVLAN
--
1.8.3.1
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