netdev - [PATCH iproute2 v2] ip: Properly display AF_BRIDGE address information for neighbor events

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Message-Id: <20180223191009.13286-1-sharpd@cumulusnetworks.com>
Date:   Fri, 23 Feb 2018 14:10:09 -0500
From:   Donald Sharp <sharpd@...ulusnetworks.com>
To:     netdev@...r.kernel.org, stephen@...workplumber.org
Subject: [PATCH iproute2 v2] ip: Properly display AF_BRIDGE address information for neighbor events

The vxlan driver when a neighbor add/delete event occurs sends
NDA_DST filled with a union:

union vxlan_addr {
	struct sockaddr_in sin;
	struct sockaddr_in6 sin6;
	struct sockaddr sa;
};

This eventually calls rt_addr_n2a_r which had no handler for the
AF_BRIDGE family and "???" was being printed.

Add code to properly display this data when requested.

Signed-off-by: Donald Sharp <sharpd@...ulusnetworks.com>
---
 lib/utils.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/utils.c b/lib/utils.c
index 24aeddd8..fe5841f6 100644
--- a/lib/utils.c
+++ b/lib/utils.c
@@ -1004,6 +1004,25 @@ const char *rt_addr_n2a_r(int af, int len,
 	}
 	case AF_PACKET:
 		return ll_addr_n2a(addr, len, ARPHRD_VOID, buf, buflen);
+	case AF_BRIDGE:
+	{
+		const union {
+			struct sockaddr sa;
+			struct sockaddr_in sin;
+			struct sockaddr_in6 sin6;
+		} *sa = addr;
+		unsigned short family = sa->sa.sa_family;
+
+		switch(family) {
+		case AF_INET:
+			return inet_ntop(AF_INET, &sa->sin.sin_addr, buf, buflen);
+		case AF_INET6:
+			return inet_ntop(AF_INET6, &sa->sin6.sin6_addr,
+					 buf, buflen);
+		}
+
+		/* fallthrough */
+	}
 	default:
 		return "???";
 	}
-- 
2.14.3