netdev - [PATCH iproute2-next 2/4] xfrm: prepare state offload logic to set mode

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Message-Id: <740d6e75fc1c8f14d4c02b28bb9bca9210ca42b1.1652179360.git.leonro@nvidia.com>
Date:   Tue, 10 May 2022 13:49:06 +0300
From:   Leon Romanovsky <leon@...nel.org>
To:     Steffen Klassert <steffen.klassert@...unet.com>,
        David Ahern <dsahern@...il.com>
Cc:     Leon Romanovsky <leonro@...dia.com>,
        "David S . Miller" <davem@...emloft.net>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, Raed Salem <raeds@...dia.com>,
        ipsec-devel <devel@...ux-ipsec.org>
Subject: [PATCH iproute2-next 2/4] xfrm: prepare state offload logic to set mode

From: Leon Romanovsky <leonro@...dia.com>

The offload in xfrm state requires to provide device and direction
in order to activate it. However, in the help section, device and
direction were displayed as an optional.

As a preparation to addition of full offload, let's fix the help
section and refactor the code to be more clear.

Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 ip/xfrm_state.c    | 35 +++++++++++++++++++----------------
 man/man8/ip-xfrm.8 |  5 +++++
 2 files changed, 24 insertions(+), 16 deletions(-)

diff --git a/ip/xfrm_state.c b/ip/xfrm_state.c
index 6fee7efd..9b6659a1 100644
--- a/ip/xfrm_state.c
+++ b/ip/xfrm_state.c
@@ -61,7 +61,7 @@ static void usage(void)
 		"        [ replay-seq-hi SEQ ] [ replay-oseq-hi SEQ ]\n"
 		"        [ flag FLAG-LIST ] [ sel SELECTOR ] [ LIMIT-LIST ] [ encap ENCAP ]\n"
 		"        [ coa ADDR[/PLEN] ] [ ctx CTX ] [ extra-flag EXTRA-FLAG-LIST ]\n"
-		"        [ offload [dev DEV] dir DIR ]\n"
+		"        [ offload dev DEV dir DIR ]\n"
 		"        [ output-mark OUTPUT-MARK [ mask MASK ] ]\n"
 		"        [ if_id IF_ID ] [ tfcpad LENGTH ]\n"
 		"Usage: ip xfrm state allocspi ID [ mode MODE ] [ mark MARK [ mask MASK ] ]\n"
@@ -272,7 +272,7 @@ static int xfrm_state_extra_flag_parse(__u32 *extra_flags, int *argcp, char ***a
 	return 0;
 }
 
-static int xfrm_offload_dir_parse(__u8 *dir, int *argcp, char ***argvp)
+static bool xfrm_offload_dir_parse(__u8 *dir, int *argcp, char ***argvp)
 {
 	int argc = *argcp;
 	char **argv = *argvp;
@@ -282,12 +282,12 @@ static int xfrm_offload_dir_parse(__u8 *dir, int *argcp, char ***argvp)
 	else if (strcmp(*argv, "out") == 0)
 		*dir = 0;
 	else
-		invarg("DIR value is invalid", *argv);
+		return false;
 
 	*argcp = argc;
 	*argvp = argv;
 
-	return 0;
+	return true;
 }
 
 static int xfrm_state_modify(int cmd, unsigned int flags, int argc, char **argv)
@@ -429,24 +429,27 @@ static int xfrm_state_modify(int cmd, unsigned int flags, int argc, char **argv)
 			addattr_l(&req.n, sizeof(req.buf), XFRMA_SEC_CTX,
 				  (void *)&ctx, ctx.sctx.len);
 		} else if (strcmp(*argv, "offload") == 0) {
-			is_offload = true;
 			NEXT_ARG();
 			if (strcmp(*argv, "dev") == 0) {
 				NEXT_ARG();
 				ifindex = ll_name_to_index(*argv);
-				if (!ifindex) {
-					invarg("value after \"offload dev\" is invalid", *argv);
-					is_offload = false;
-				}
-				NEXT_ARG();
-			}
+				if (!ifindex)
+					invarg("Invalid device name", *argv);
+			} else
+				invarg("Missing dev keyword", *argv);
+
+			NEXT_ARG();
 			if (strcmp(*argv, "dir") == 0) {
+				bool is_dir;
+
 				NEXT_ARG();
-				xfrm_offload_dir_parse(&dir, &argc, &argv);
-			} else {
-				invarg("value after \"offload dir\" is invalid", *argv);
-				is_offload = false;
-			}
+				is_dir = xfrm_offload_dir_parse(&dir, &argc,
+								&argv);
+				if (!is_dir)
+					invarg("DIR value is invalid", *argv);
+			} else
+				invarg("Missing DIR keyword", *argv);
+			is_offload = true;
 		} else if (strcmp(*argv, "output-mark") == 0) {
 			NEXT_ARG();
 			if (get_u32(&output_mark.v, *argv, 0))
diff --git a/man/man8/ip-xfrm.8 b/man/man8/ip-xfrm.8
index bf725cab..4243a023 100644
--- a/man/man8/ip-xfrm.8
+++ b/man/man8/ip-xfrm.8
@@ -65,6 +65,11 @@ ip-xfrm \- transform configuration
 .IR MASK " ] ]"
 .RB "[ " if_id
 .IR IF-ID " ]"
+.RB "[ " offload
+.RB dev
+.IR DEV "
+.RB dir
+.IR DIR " ]"
 .RB "[ " tfcpad
 .IR LENGTH " ]"
 
-- 
2.35.1