netdev - [PATCH iproute2-next 2/2] gre/gre6: Unify attribute addition to netlink buffer

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Date:   Mon, 22 Jan 2018 18:46:54 +0200
From:   Serhey Popovych <serhe.popovych@...il.com>
To:     netdev@...r.kernel.org
Cc:     jbenc@...hat.com, u9012063@...il.com, julien@...ulusnetworks.com
Subject: [PATCH iproute2-next 2/2] gre/gre6: Unify attribute addition to netlink buffer

There are couple of minor improvements:

  1) Check erspan_ver == 2 in gre6. It still could
     be 1 if erspan_idx is 0.

  2) Add tunnel encapsulation attributes only when
     collect metadata not in effect in gre.

  3) Trivial: address checkpatch issues.

Signed-off-by: Serhey Popovych <serhe.popovych@...il.com>
---
 ip/link_gre.c  |   23 ++++++++++++-----------
 ip/link_gre6.c |   13 ++++++++-----
 2 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/ip/link_gre.c b/ip/link_gre.c
index 131a087..12c2e22 100644
--- a/ip/link_gre.c
+++ b/ip/link_gre.c
@@ -366,6 +366,8 @@ get_failed:
 		addattr_l(n, 1024, IFLA_GRE_LOCAL, &saddr, 4);
 		addattr_l(n, 1024, IFLA_GRE_REMOTE, &daddr, 4);
 		addattr_l(n, 1024, IFLA_GRE_PMTUDISC, &pmtudisc, 1);
+		if (ignore_df)
+			addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
 		if (link)
 			addattr32(n, 1024, IFLA_GRE_LINK, link);
 		addattr_l(n, 1024, IFLA_GRE_TTL, &ttl, 1);
@@ -374,24 +376,23 @@ get_failed:
 		if (erspan_ver) {
 			addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
 			if (erspan_ver == 1 && erspan_idx != 0) {
-				addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
+				addattr32(n, 1024,
+					  IFLA_GRE_ERSPAN_INDEX, erspan_idx);
 			} else if (erspan_ver == 2) {
-				addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir);
-				addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid);
+				addattr8(n, 1024,
+					 IFLA_GRE_ERSPAN_DIR, erspan_dir);
+				addattr16(n, 1024,
+					  IFLA_GRE_ERSPAN_HWID, erspan_hwid);
 			}
 		}
+		addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
+		addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
+		addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
+		addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
 	} else {
 		addattr_l(n, 1024, IFLA_GRE_COLLECT_METADATA, NULL, 0);
 	}
 
-	addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
-	addattr16(n, 1024, IFLA_GRE_ENCAP_FLAGS, encapflags);
-	addattr16(n, 1024, IFLA_GRE_ENCAP_SPORT, htons(encapsport));
-	addattr16(n, 1024, IFLA_GRE_ENCAP_DPORT, htons(encapdport));
-
-	if (ignore_df)
-		addattr8(n, 1024, IFLA_GRE_IGNORE_DF, ignore_df & 1);
-
 	return 0;
 }
 
diff --git a/ip/link_gre6.c b/ip/link_gre6.c
index a0eeb5a..875d2dc 100644
--- a/ip/link_gre6.c
+++ b/ip/link_gre6.c
@@ -405,10 +405,13 @@ get_failed:
 		if (erspan_ver) {
 			addattr8(n, 1024, IFLA_GRE_ERSPAN_VER, erspan_ver);
 			if (erspan_ver == 1 && erspan_idx != 0) {
-				addattr32(n, 1024, IFLA_GRE_ERSPAN_INDEX, erspan_idx);
-			} else {
-				addattr8(n, 1024, IFLA_GRE_ERSPAN_DIR, erspan_dir);
-				addattr16(n, 1024, IFLA_GRE_ERSPAN_HWID, erspan_hwid);
+				addattr32(n, 1024,
+					  IFLA_GRE_ERSPAN_INDEX, erspan_idx);
+			} else if (erspan_ver == 2) {
+				addattr8(n, 1024,
+					 IFLA_GRE_ERSPAN_DIR, erspan_dir);
+				addattr16(n, 1024,
+					  IFLA_GRE_ERSPAN_HWID, erspan_hwid);
 			}
 		}
 		addattr16(n, 1024, IFLA_GRE_ENCAP_TYPE, encaptype);
@@ -645,7 +648,7 @@ static void gre_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
 }
 
 static void gre_print_help(struct link_util *lu, int argc, char **argv,
-	FILE *f)
+			   FILE *f)
 {
 	print_usage(f);
 }
-- 
1.7.10.4