netdev - [PATCH iproute2-next 1/2] macsec: report the offloading mode currently selected

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Message-Id: <20200120201823.887937-2-antoine.tenart@bootlin.com>
Date:   Mon, 20 Jan 2020 21:18:22 +0100
From:   Antoine Tenart <antoine.tenart@...tlin.com>
To:     dsahern@...il.com, sd@...asysnail.net
Cc:     Antoine Tenart <antoine.tenart@...tlin.com>, netdev@...r.kernel.org
Subject: [PATCH iproute2-next 1/2] macsec: report the offloading mode currently selected

This patch adds support to report the MACsec offloading mode currently
being enabled, which as of now can either be 'off' or 'phy'. This
information is reported through the `ip macsec show` command:

  # ip macsec show
  18: macsec0: protect on validate strict sc off sa off encrypt on send_sci on end_station off scb off replay off
      cipher suite: GCM-AES-128, using ICV length 16
      TXSC: 3e5035b67c860001 on SA 0
          0: PN 1, state on, key 00000000000000000000000000000000
      RXSC: b4969112700f0001, state on
          0: PN 1, state on, key 01000000000000000000000000000000
      offload: phy
  19: macsec1: protect on validate strict sc off sa off encrypt on send_sci on end_station off scb off replay off
      cipher suite: GCM-AES-128, using ICV length 16
      TXSC: 3e5035b67c880001 on SA 0
          1: PN 1, state on, key 00000000000000000000000000000000
      RXSC: b4969112700f0001, state on
          1: PN 1, state on, key 01000000000000000000000000000000
      offload: off

Signed-off-by: Antoine Tenart <antoine.tenart@...tlin.com>
---
 ip/ipmacsec.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/ip/ipmacsec.c b/ip/ipmacsec.c
index ad6ad7d6b79f..db7202ceb0a7 100644
--- a/ip/ipmacsec.c
+++ b/ip/ipmacsec.c
@@ -31,6 +31,11 @@ static const char * const validate_str[] = {
 	[MACSEC_VALIDATE_STRICT] = "strict",
 };
 
+static const char * const offload_str[] = {
+	[MACSEC_OFFLOAD_OFF] = "off",
+	[MACSEC_OFFLOAD_PHY] = "phy",
+};
+
 struct sci {
 	__u64 sci;
 	__u16 port;
@@ -997,6 +1002,19 @@ static int process(struct nlmsghdr *n, void *arg)
 	if (attrs[MACSEC_ATTR_RXSC_LIST])
 		print_rxsc_list(attrs[MACSEC_ATTR_RXSC_LIST]);
 
+	if (attrs[MACSEC_ATTR_OFFLOAD]) {
+		struct rtattr *attrs_offload[MACSEC_OFFLOAD_ATTR_MAX + 1];
+		__u8 offload;
+
+		parse_rtattr_nested(attrs_offload, MACSEC_OFFLOAD_ATTR_MAX,
+				    attrs[MACSEC_ATTR_OFFLOAD]);
+
+		offload = rta_getattr_u8(attrs_offload[MACSEC_OFFLOAD_ATTR_TYPE]);
+		print_string(PRINT_ANY, "offload",
+			     "    offload: %s ", offload_str[offload]);
+		print_nl();
+	}
+
 	close_json_object();
 
 	return 0;
-- 
2.24.1