[PATCH RFC iproute2] iplink: Support envhdrlen

[Toshiaki Makita]

This adds support for envhdrlen.

Example:
 # ip link set eno1 envhdrlen 8
 # ip link show eno1
 2: eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 envhdrlen 8 qdisc fq_codel 
state UP mode DEFAULT group default qlen 1000
     link/ether 44:37:e6:6c:69:a4 brd ff:ff:ff:ff:ff:ff

Note:
As an RFC, this includes update for kernel headers.

Signed-off-by: Toshiaki Makita <makita.toshi...@lab.ntt.co.jp>
---
 include/linux/if_link.h |  1 +
 ip/ipaddress.c          |  2 ++
 ip/iplink.c             | 10 ++++++++++
 3 files changed, 13 insertions(+)

diff --git a/include/linux/if_link.h b/include/linux/if_link.h
index b9299e3..46ef8cc 100644
--- a/include/linux/if_link.h
+++ b/include/linux/if_link.h
@@ -157,6 +157,7 @@ enum {
        IFLA_GSO_MAX_SIZE,
        IFLA_PAD,
        IFLA_XDP,
+       IFLA_ENV_HDR_LEN,
        __IFLA_MAX
 };
 
diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 76bd7b3..92a472d 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -820,6 +820,8 @@ int print_linkinfo(const struct sockaddr_nl *who,
 
        if (tb[IFLA_MTU])
                fprintf(fp, "mtu %u ", *(int *)RTA_DATA(tb[IFLA_MTU]));
+       if (tb[IFLA_ENV_HDR_LEN])
+               fprintf(fp, "envhdrlen %u ", *(int 
*)RTA_DATA(tb[IFLA_ENV_HDR_LEN]));
        if (tb[IFLA_QDISC])
                fprintf(fp, "qdisc %s ", rta_getattr_str(tb[IFLA_QDISC]));
        if (tb[IFLA_MASTER]) {
diff --git a/ip/iplink.c b/ip/iplink.c
index 6b1db18..4dcb9ac 100644
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -50,6 +50,7 @@ void iplink_usage(void)
                fprintf(stderr, "                   [ address LLADDR ]\n");
                fprintf(stderr, "                   [ broadcast LLADDR ]\n");
                fprintf(stderr, "                   [ mtu MTU ] [index IDX 
]\n");
+               fprintf(stderr, "                   [ envhdrlen ENVHDRLEN ]\n");
                fprintf(stderr, "                   [ numtxqueues QUEUE_COUNT 
]\n");
                fprintf(stderr, "                   [ numrxqueues QUEUE_COUNT 
]\n");
                fprintf(stderr, "                   type TYPE [ ARGS ]\n");
@@ -489,6 +490,7 @@ int iplink_parse(int argc, char **argv, struct iplink_req 
*req,
        char abuf[32];
        int qlen = -1;
        int mtu = -1;
+       int envhdrlen = -1;
        int netns = -1;
        int vf = -1;
        int numtxqueues = -1;
@@ -547,6 +549,14 @@ int iplink_parse(int argc, char **argv, struct iplink_req 
*req,
                        if (get_integer(&mtu, *argv, 0))
                                invarg("Invalid \"mtu\" value\n", *argv);
                        addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
+               } else if (strcmp(*argv, "envhdrlen") == 0) {
+                       NEXT_ARG();
+                       if (envhdrlen != -1)
+                               duparg("envhdrlen", *argv);
+                       if (get_integer(&envhdrlen, *argv, 0))
+                               invarg("Invalid \"envhdrlen\" value\n", *argv);
+                       addattr_l(&req->n, sizeof(*req), IFLA_ENV_HDR_LEN,
+                                 &envhdrlen, 4);
                } else if (strcmp(*argv, "netns") == 0) {
                        NEXT_ARG();
                        if (netns != -1)
-- 
2.5.5