From 01f9e89ffb2f475f597e5ea9a3d7ef30a7b0654c Mon Sep 17 00:00:00 2001
From: whd <7058128+superwhd@users.noreply.github.com>
Date: Thu, 15 Dec 2022 05:28:17 +0800
Subject: [PATCH] [posix] enable receiving Neighbor Advertisement on infra
 interface (#8521)

This commit enables receiving Neighbor Advertisements (NA) on the
infra link.

OTBR relies on receiving Neighbor Advertisement to check if a router
is active. Without receiving NA, OTBR may wrongly see a router as
inactive and remove the discovered prefixes from Network Data too
early, which breaks the border routing feature.
---
 src/posix/platform/infra_if.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/posix/platform/infra_if.cpp b/src/posix/platform/infra_if.cpp
index 94cb747a8..def69f4d9 100644
--- a/src/posix/platform/infra_if.cpp
+++ b/src/posix/platform/infra_if.cpp
@@ -132,10 +132,11 @@ int CreateIcmp6Socket(void)
     sock = SocketWithCloseExec(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6, kSocketBlock);
     VerifyOrDie(sock != -1, OT_EXIT_ERROR_ERRNO);
 
-    // Only accept router advertisements and solicitations.
+    // Only accept Router Advertisements, Router Solicitations and Neighbor Advertisements.
     ICMP6_FILTER_SETBLOCKALL(&filter);
     ICMP6_FILTER_SETPASS(ND_ROUTER_SOLICIT, &filter);
     ICMP6_FILTER_SETPASS(ND_ROUTER_ADVERT, &filter);
+    ICMP6_FILTER_SETPASS(ND_NEIGHBOR_ADVERT, &filter);
 
     rval = setsockopt(sock, IPPROTO_ICMPV6, ICMP6_FILTER, &filter, sizeof(filter));
     VerifyOrDie(rval == 0, OT_EXIT_ERROR_ERRNO);