* [PATCH RFC iproute2-next v2 1/2] uapi: sync lwtunnel.h and add seg6_mobile.h
2026-09-01 2:08 [PATCH RFC iproute2-next v2 0/2] seg6: add support for the SRv6 End.MAP behavior under seg6mobile encap Yuya Kusakabe
@ 2026-09-01 2:08 ` Yuya Kusakabe
2026-09-01 2:09 ` [PATCH RFC iproute2-next v2 2/2] seg6: add support for the End.MAP behavior under seg6mobile encap Yuya Kusakabe
1 sibling, 0 replies; 3+ messages in thread
From: Yuya Kusakabe @ 2026-09-01 2:08 UTC (permalink / raw)
To: David Ahern, netdev; +Cc: Andrea Mayer, Andrea Mayer, Yuya Kusakabe
Assisted-by: Claude:claude-fable-5
Signed-off-by: Yuya Kusakabe <yuya.kusakabe@gmail.com>
---
include/uapi/linux/lwtunnel.h | 1 +
include/uapi/linux/seg6_mobile.h | 61 ++++++++++++++++++++++++++++++++++++++++
2 files changed, 62 insertions(+)
diff --git a/include/uapi/linux/lwtunnel.h b/include/uapi/linux/lwtunnel.h
index 9d22961be619..b5adca10a9f1 100644
--- a/include/uapi/linux/lwtunnel.h
+++ b/include/uapi/linux/lwtunnel.h
@@ -16,6 +16,7 @@ enum lwtunnel_encap_types {
LWTUNNEL_ENCAP_RPL,
LWTUNNEL_ENCAP_IOAM6,
LWTUNNEL_ENCAP_XFRM,
+ LWTUNNEL_ENCAP_SEG6_MOBILE,
__LWTUNNEL_ENCAP_MAX,
};
diff --git a/include/uapi/linux/seg6_mobile.h b/include/uapi/linux/seg6_mobile.h
new file mode 100644
index 000000000000..551ec8e94884
--- /dev/null
+++ b/include/uapi/linux/seg6_mobile.h
@@ -0,0 +1,61 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/*
+ * SRv6 Mobile User Plane implementation
+ *
+ * Author:
+ * Yuya Kusakabe <yuya.kusakabe@gmail.com>
+ */
+#ifndef _LINUX_SEG6_MOBILE_H
+#define _LINUX_SEG6_MOBILE_H
+
+enum {
+ SEG6_MOBILE_UNSPEC,
+ SEG6_MOBILE_ACTION,
+ SEG6_MOBILE_MAPPED_SID,
+ SEG6_MOBILE_COUNTERS,
+ __SEG6_MOBILE_MAX,
+};
+
+#define SEG6_MOBILE_MAX (__SEG6_MOBILE_MAX - 1)
+
+enum {
+ SEG6_MOBILE_ACTION_UNSPEC = 0,
+ /* swap IPv6 DA with the mapped SID, leave SRH untouched */
+ SEG6_MOBILE_ACTION_END_MAP = 1,
+
+ __SEG6_MOBILE_ACTION_MAX,
+};
+
+#define SEG6_MOBILE_ACTION_MAX (__SEG6_MOBILE_ACTION_MAX - 1)
+
+/* SRv6 Mobile Behavior counters are encoded as netlink attributes
+ * guaranteeing the correct alignment.
+ * Each counter is identified by a different attribute type (i.e.
+ * SEG6_MOBILE_CNT_PACKETS).
+ *
+ * - SEG6_MOBILE_CNT_PACKETS: identifies a counter that counts the number
+ * of packets that have been CORRECTLY processed by an SRv6 Behavior
+ * instance (i.e., packets that generate errors or are dropped are NOT
+ * counted).
+ *
+ * - SEG6_MOBILE_CNT_BYTES: identifies a counter that counts the total
+ * amount of traffic in bytes of all packets that have been CORRECTLY
+ * processed by an SRv6 Behavior instance (i.e., packets that generate
+ * errors or are dropped are NOT counted).
+ *
+ * - SEG6_MOBILE_CNT_ERRORS: identifies a counter that counts the number
+ * of packets that have NOT been properly processed by an SRv6 Behavior
+ * instance (i.e., packets that generate errors or are dropped).
+ */
+enum {
+ SEG6_MOBILE_CNT_UNSPEC,
+ SEG6_MOBILE_CNT_PACKETS,
+ SEG6_MOBILE_CNT_BYTES,
+ SEG6_MOBILE_CNT_ERRORS,
+ SEG6_MOBILE_CNT_PAD, /* pad for 64 bits values */
+ __SEG6_MOBILE_CNT_MAX,
+};
+
+#define SEG6_MOBILE_CNT_MAX (__SEG6_MOBILE_CNT_MAX - 1)
+
+#endif /* _LINUX_SEG6_MOBILE_H */
--
2.50.1
^ permalink raw reply related [flat|nested] 3+ messages in thread* [PATCH RFC iproute2-next v2 2/2] seg6: add support for the End.MAP behavior under seg6mobile encap
2026-09-01 2:08 [PATCH RFC iproute2-next v2 0/2] seg6: add support for the SRv6 End.MAP behavior under seg6mobile encap Yuya Kusakabe
2026-09-01 2:08 ` [PATCH RFC iproute2-next v2 1/2] uapi: sync lwtunnel.h and add seg6_mobile.h Yuya Kusakabe
@ 2026-09-01 2:09 ` Yuya Kusakabe
1 sibling, 0 replies; 3+ messages in thread
From: Yuya Kusakabe @ 2026-09-01 2:09 UTC (permalink / raw)
To: David Ahern, netdev; +Cc: Andrea Mayer, Andrea Mayer, Yuya Kusakabe
Wire up a new "seg6mobile" lightweight tunnel encap type that mirrors
the kernel's LWTUNNEL_ENCAP_SEG6_MOBILE namespace, and add parse and
print support for the first RFC 9433 behavior it carries: End.MAP.
End.MAP swaps the IPv6 destination address with the configured mapped SID
and forwards the packet via the IPv6 FIB without consuming the SRH:
ip -6 route add 2001:db8:f::/64 \
encap seg6mobile action End.MAP mapped_sid 2001:db8:2::e \
dev <dev>
Help text and the ip-route(8) man page get the corresponding ENCAPTYPE
and SEG6MOBILE entries.
Assisted-by: Claude:claude-fable-5
Signed-off-by: Yuya Kusakabe <yuya.kusakabe@gmail.com>
---
ip/iproute.c | 6 +-
ip/iproute_lwtunnel.c | 173 +++++++++++++++++++++++++++++++++++++++++++++++++
man/man8/ip-route.8.in | 34 +++++++++-
3 files changed, 210 insertions(+), 3 deletions(-)
diff --git a/ip/iproute.c b/ip/iproute.c
index 1ce71f78e064..27def3b7e346 100644
--- a/ip/iproute.c
+++ b/ip/iproute.c
@@ -98,8 +98,8 @@ static void usage(void)
"TIME := NUMBER[s|ms]\n"
"BOOL := [1|0]\n"
"FEATURES := ecn\n"
- "ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local | rpl | ioam6 | xfrm ]\n"
- "ENCAPHDR := [ MPLSLABEL | SEG6HDR | SEG6LOCAL | IOAM6HDR | XFRMINFO ]\n"
+ "ENCAPTYPE := [ mpls | ip | ip6 | seg6 | seg6local | seg6mobile | rpl | ioam6 | xfrm ]\n"
+ "ENCAPHDR := [ MPLSLABEL | SEG6HDR | SEG6LOCAL | SEG6MOBILE | IOAM6HDR | XFRMINFO ]\n"
"SEG6HDR := [ mode SEGMODE ] segs ADDR1,ADDRi,ADDRn [hmac HMACKEYID] [cleanup]\n"
" [ lookup TABLEID ]\n"
"SEGMODE := [ encap | encap.red | inline | l2encap | l2encap.red ]\n"
@@ -112,6 +112,8 @@ static void usage(void)
" table TABLEID | vrftable TABLEID | endpoint PROGNAME }\n"
"FLAVORS := { FLAVOR[,FLAVOR] }\n"
"FLAVOR := { psp | usp | usd | next-csid }\n"
+ "SEG6MOBILE := action MOBILE_ACTION mapped_sid ADDR [ count ]\n"
+ "MOBILE_ACTION := { End.MAP }\n"
"IOAM6HDR := trace prealloc type IOAM6_TRACE_TYPE ns IOAM6_NAMESPACE size IOAM6_TRACE_SIZE\n"
"XFRMINFO := if_id IF_ID [ link_dev LINK ]\n"
"ROUTE_GET_FLAGS := ROUTE_GET_FLAG [ ROUTE_GET_FLAGS ]\n"
diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c
index 9a1e747c6951..b3a2388906ec 100644
--- a/ip/iproute_lwtunnel.c
+++ b/ip/iproute_lwtunnel.c
@@ -28,6 +28,7 @@
#include <linux/rpl_iptunnel.h>
#include <linux/seg6_hmac.h>
#include <linux/seg6_local.h>
+#include <linux/seg6_mobile.h>
#include <linux/if_tunnel.h>
#include <linux/ioam6.h>
#include <linux/ioam6_iptunnel.h>
@@ -55,6 +56,8 @@ static const char *format_encap_type(uint16_t type)
return "ioam6";
case LWTUNNEL_ENCAP_XFRM:
return "xfrm";
+ case LWTUNNEL_ENCAP_SEG6_MOBILE:
+ return "seg6mobile";
default:
return "unknown";
}
@@ -95,6 +98,8 @@ static uint16_t read_encap_type(const char *name)
return LWTUNNEL_ENCAP_IOAM6;
else if (strcmp(name, "xfrm") == 0)
return LWTUNNEL_ENCAP_XFRM;
+ else if (strcmp(name, "seg6mobile") == 0)
+ return LWTUNNEL_ENCAP_SEG6_MOBILE;
else if (strcmp(name, "help") == 0)
encap_type_usage();
@@ -585,6 +590,91 @@ static void print_encap_seg6local(FILE *fp, struct rtattr *encap)
print_seg6_local_flavors(fp, tb[SEG6_LOCAL_FLAVORS]);
}
+static const char *seg6_mobile_action_names[SEG6_MOBILE_ACTION_MAX + 1] = {
+ [SEG6_MOBILE_ACTION_END_MAP] = "End.MAP",
+};
+
+static const char *format_seg6_mobile_action(int action)
+{
+ if (action < 0 || action > SEG6_MOBILE_ACTION_MAX)
+ return "<invalid>";
+
+ return seg6_mobile_action_names[action] ?: "<unknown>";
+}
+
+static int read_seg6_mobile_action(const char *name)
+{
+ int i;
+
+ for (i = 0; i < SEG6_MOBILE_ACTION_MAX + 1; i++) {
+ if (!seg6_mobile_action_names[i])
+ continue;
+
+ if (strcmp(seg6_mobile_action_names[i], name) == 0)
+ return i;
+ }
+
+ return SEG6_MOBILE_ACTION_UNSPEC;
+}
+
+static void print_seg6_mobile_counters(FILE *fp, struct rtattr *encap)
+{
+ struct rtattr *tb[SEG6_MOBILE_CNT_MAX + 1];
+ __u64 packets = 0, bytes = 0, errors = 0;
+
+ parse_rtattr_nested(tb, SEG6_MOBILE_CNT_MAX, encap);
+
+ if (tb[SEG6_MOBILE_CNT_PACKETS])
+ packets = rta_getattr_u64(tb[SEG6_MOBILE_CNT_PACKETS]);
+
+ if (tb[SEG6_MOBILE_CNT_BYTES])
+ bytes = rta_getattr_u64(tb[SEG6_MOBILE_CNT_BYTES]);
+
+ if (tb[SEG6_MOBILE_CNT_ERRORS])
+ errors = rta_getattr_u64(tb[SEG6_MOBILE_CNT_ERRORS]);
+
+ if (is_json_context()) {
+ open_json_object("stats64");
+
+ print_u64(PRINT_JSON, "packets", NULL, packets);
+ print_u64(PRINT_JSON, "bytes", NULL, bytes);
+ print_u64(PRINT_JSON, "errors", NULL, errors);
+
+ close_json_object();
+ } else {
+ print_string(PRINT_FP, NULL, "%s ", "packets");
+ print_num(fp, 1, packets);
+
+ print_string(PRINT_FP, NULL, "%s ", "bytes");
+ print_num(fp, 1, bytes);
+
+ print_string(PRINT_FP, NULL, "%s ", "errors");
+ print_num(fp, 1, errors);
+ }
+}
+
+static void print_encap_seg6mobile(FILE *fp, struct rtattr *encap)
+{
+ struct rtattr *tb[SEG6_MOBILE_MAX + 1];
+ int action;
+
+ parse_rtattr_nested(tb, SEG6_MOBILE_MAX, encap);
+
+ if (!tb[SEG6_MOBILE_ACTION])
+ return;
+
+ action = rta_getattr_u32(tb[SEG6_MOBILE_ACTION]);
+ print_string(PRINT_ANY, "action",
+ "action %s ", format_seg6_mobile_action(action));
+
+ if (tb[SEG6_MOBILE_MAPPED_SID])
+ print_string(PRINT_ANY, "mapped_sid", "mapped_sid %s ",
+ rt_addr_n2a_rta(AF_INET6, tb[SEG6_MOBILE_MAPPED_SID]));
+
+ if (tb[SEG6_MOBILE_COUNTERS] && show_stats)
+ print_seg6_mobile_counters(fp, tb[SEG6_MOBILE_COUNTERS]);
+}
+
static void print_encap_mpls(FILE *fp, struct rtattr *encap)
{
struct rtattr *tb[MPLS_IPTUNNEL_MAX+1];
@@ -900,6 +990,9 @@ void lwt_print_encap(FILE *fp, struct rtattr *encap_type,
case LWTUNNEL_ENCAP_XFRM:
print_encap_xfrm(fp, encap);
break;
+ case LWTUNNEL_ENCAP_SEG6_MOBILE:
+ print_encap_seg6mobile(fp, encap);
+ break;
}
close_json_object();
}
@@ -1607,6 +1700,83 @@ static int parse_encap_seg6local(struct rtattr *rta, size_t len, int *argcp,
return ret;
}
+/* for the moment, counters are always initialized to zero by the kernel; so we
+ * do not expect to parse any argument here.
+ */
+static int seg6mobile_fill_counters(struct rtattr *rta, size_t len, int attr)
+{
+ struct rtattr *nest;
+ int ret;
+
+ nest = rta_nest(rta, len, attr);
+
+ ret = rta_addattr64(rta, len, SEG6_MOBILE_CNT_PACKETS, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = rta_addattr64(rta, len, SEG6_MOBILE_CNT_BYTES, 0);
+ if (ret < 0)
+ return ret;
+
+ ret = rta_addattr64(rta, len, SEG6_MOBILE_CNT_ERRORS, 0);
+ if (ret < 0)
+ return ret;
+
+ rta_nest_end(rta, nest);
+ return 0;
+}
+
+static int parse_encap_seg6mobile(struct rtattr *rta, size_t len, int *argcp,
+ char ***argvp)
+{
+ int action_ok = 0, mapped_sid_ok = 0, counters_ok = 0;
+ char **argv = *argvp;
+ int argc = *argcp;
+ inet_prefix addr;
+ __u32 action = 0;
+ int ret = 0;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "action") == 0) {
+ NEXT_ARG();
+ if (action_ok++)
+ duparg2("action", *argv);
+ action = read_seg6_mobile_action(*argv);
+ if (!action)
+ invarg("\"action\" value is invalid\n", *argv);
+ ret = rta_addattr32(rta, len, SEG6_MOBILE_ACTION,
+ action);
+ } else if (strcmp(*argv, "mapped_sid") == 0) {
+ NEXT_ARG();
+ if (mapped_sid_ok++)
+ duparg2("mapped_sid", *argv);
+ get_addr(&addr, *argv, AF_INET6);
+ ret = rta_addattr_l(rta, len, SEG6_MOBILE_MAPPED_SID,
+ &addr.data, addr.bytelen);
+ } else if (strcmp(*argv, "count") == 0) {
+ if (counters_ok++)
+ duparg2("count", *argv);
+ ret = seg6mobile_fill_counters(rta, len,
+ SEG6_MOBILE_COUNTERS);
+ } else {
+ break;
+ }
+ if (ret)
+ return ret;
+ argc--; argv++;
+ }
+
+ if (!action) {
+ fprintf(stderr, "Missing action type\n");
+ exit(-1);
+ }
+
+ *argcp = argc + 1;
+ *argvp = argv - 1;
+
+ return ret;
+}
+
static int parse_encap_mpls(struct rtattr *rta, size_t len,
int *argcp, char ***argvp)
{
@@ -2346,6 +2516,9 @@ int lwt_parse_encap(struct rtattr *rta, size_t len, int *argcp, char ***argvp,
case LWTUNNEL_ENCAP_XFRM:
ret = parse_encap_xfrm(rta, len, &argc, &argv);
break;
+ case LWTUNNEL_ENCAP_SEG6_MOBILE:
+ ret = parse_encap_seg6mobile(rta, len, &argc, &argv);
+ break;
default:
fprintf(stderr, "Error: unsupported encap type\n");
break;
diff --git a/man/man8/ip-route.8.in b/man/man8/ip-route.8.in
index fd04432f599b..5a4777153967 100644
--- a/man/man8/ip-route.8.in
+++ b/man/man8/ip-route.8.in
@@ -195,7 +195,8 @@ throw " | " unreachable " | " prohibit " | " blackhole " | " nat " ]"
.ti -8
.IR ENCAP " := [ "
.IR ENCAP_MPLS " | " ENCAP_IP " | " ENCAP_BPF " | "
-.IR ENCAP_SEG6 " | " ENCAP_SEG6LOCAL " | " ENCAP_IOAM6 " ] "
+.IR ENCAP_SEG6 " | " ENCAP_SEG6LOCAL " | " ENCAP_SEG6MOBILE " | "
+.IR ENCAP_IOAM6 " ] "
.ti -8
.IR ENCAP_MPLS " := "
@@ -258,6 +259,14 @@ throw " | " unreachable " | " prohibit " | " blackhole " | " nat " ]"
.IR SEG6_ACTION_PARAM " ] [ "
.BR count " ] "
+.ti -8
+.IR ENCAP_SEG6MOBILE " := "
+.B seg6mobile
+.BR action
+.IR SEG6_MOBILE_ACTION " [ "
+.IR SEG6_MOBILE_PARAM " ] [ "
+.BR count " ] "
+
.ti -8
.IR ENCAP_IOAM6 " := "
.BR ioam6 " ["
@@ -764,6 +773,9 @@ is a string specifying the supported encapsulation type. Namely:
.BI seg6local
- local SRv6 segment processing
.sp
+.BI seg6mobile
+- SRv6 Mobile User Plane processing (RFC 9433)
+.sp
.BI ioam6
- encapsulation type IPv6 IOAM
.sp
@@ -1097,6 +1109,26 @@ flavors. The Locator-Node Function length must be greater than 0 and evenly
divisible by 8. This attribute can be used only with NEXT-C-SID flavor.
.in -4
+.B seg6mobile
+.in +2
+.IR SEG6_MOBILE_ACTION " [ "
+.IR SEG6_MOBILE_PARAM " ] [ "
+.BR count " ]"
+- SRv6 Mobile User Plane operation (RFC 9433) to perform on matching
+packets. The optional \fBcount\fR attribute enables per-CPU packet, byte
+and error counters for this route; the aggregated values are printed by
+the \fB-s\fR flag in the \fBshow\fR command. The following actions are
+currently supported.
+.in +2
+
+.B End.MAP mapped_sid
+.I ADDRESS
+- Replace the IPv6 destination address with the configured mapped SID
+.RI ( ADDRESS )
+and forward via the IPv6 FIB; an SRH, if present, is not modified
+(neither the SID list nor the Segments Left value).
+.in -4
+
.B ioam6
.in +2
.B freq K/N
--
2.50.1
^ permalink raw reply related [flat|nested] 3+ messages in thread