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authorJames Clarke2017-10-07 18:53:23 +0100
committerDenys Vlasenko2017-10-30 16:06:50 +0100
commit518fb3ba193cddc1369090bfdf827618b42791db (patch)
tree437b68db12aaa6910a1f2d717f2374c5ad78acb7 /libbb/udp_io.c
parentd1535216ca27047e3962d61b975bd2a638aa45a2 (diff)
downloadbusybox-518fb3ba193cddc1369090bfdf827618b42791db.zip
busybox-518fb3ba193cddc1369090bfdf827618b42791db.tar.gz
udp_io, traceroute: Standardise IPv6 PKTINFO handling to be portable
The current standard (RFC 3542) is for IPV6_RECVPKTINFO to be given to setsockopt, and IPV6_PKTINFO to be used as the packet type. Previously, RFC 2292 required IPV6_PKTINFO to be used for both, but RFC 3542 re-purposed IPV6_PKTINFO when given to setsockopt. The special Linux-specific IPV6_2292PKTINFO has the same semantics as IPV6_PKTINFO in RFC 2292, but was introduced at the same time as IPV6_RECVPKTINFO. Therefore, if we have IPV6_RECVPKTINFO available, we can use the RFC 3542 style, and if not, we assume that only the RFC 2292 API is available, using IPV6_PKTINFO for both. Signed-off-by: James Clarke <jrtc27@jrtc27.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb/udp_io.c')
-rw-r--r--libbb/udp_io.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/libbb/udp_io.c b/libbb/udp_io.c
index 6e3ef48..68355e6 100644
--- a/libbb/udp_io.c
+++ b/libbb/udp_io.c
@@ -8,6 +8,10 @@
*/
#include "libbb.h"
+#if defined(IPV6_PKTINFO) && !defined(IPV6_RECVPKTINFO)
+# define IPV6_RECVPKTINFO IPV6_PKTINFO
+#endif
+
/*
* This asks kernel to let us know dst addr/port of incoming packets
* We don't check for errors here. Not supported == won't be used
@@ -18,8 +22,8 @@ socket_want_pktinfo(int fd UNUSED_PARAM)
#ifdef IP_PKTINFO
setsockopt_1(fd, IPPROTO_IP, IP_PKTINFO);
#endif
-#if ENABLE_FEATURE_IPV6 && defined(IPV6_PKTINFO)
- setsockopt_1(fd, IPPROTO_IPV6, IPV6_PKTINFO);
+#if ENABLE_FEATURE_IPV6 && defined(IPV6_RECVPKTINFO)
+ setsockopt_1(fd, IPPROTO_IPV6, IPV6_RECVPKTINFO);
#endif
}