Enable send-/recvmmsg for AIX >= 7.2 and disable SUPPORT_LOCAL_ADDR.

AIX doesn't support this implementation for local addresses. The AF_INET
case is unimplemented when sending. The AF_INET6 case is limited to 110
messages. The limiting factor is currently unclear.

Fixes #29292

Signed-off-by: Matthias Kraft <Matthias.Kraft@ibm.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Norbert Pocs <norbertp@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/29334)

diff --git a/crypto/bio/bss_dgram.c b/crypto/bio/bss_dgram.c
index b72373382573139ff3de1338c35ee5b4a56e0f17..1f62ecf844bb2ef4f00045fabfda3477943fd8dc 100644 (file)
--- a/crypto/bio/bss_dgram.c
+++ b/crypto/bio/bss_dgram.c
@@ -64,7 +64,12 @@
 #undef NO_RECVMSG
 #define NO_RECVMSG
 #endif
-#if (defined(__ANDROID_API__) && __ANDROID_API__ < 21) || defined(_AIX)
+#if (defined(__ANDROID_API__) && __ANDROID_API__ < 21)
+#undef NO_RECVMMSG
+#define NO_RECVMMSG
+#endif
+#if defined(_AIX) && !defined(_AIX72)
+/* AIX >= 7.2 provides sendmmsg() and recvmmsg(). */
 #undef NO_RECVMMSG
 #define NO_RECVMMSG
 #endif
@@ -130,7 +135,14 @@
     BIO_MAX(BIO_CMSG_ALLOC_LEN_1, \
         BIO_MAX(BIO_CMSG_ALLOC_LEN_2, BIO_CMSG_ALLOC_LEN_3))
 #endif
-#if (defined(IP_PKTINFO) || defined(IP_RECVDSTADDR)) && defined(IPV6_RECVPKTINFO)
+/*
+ * Although AIX defines IP_RECVDSTADDR and IPV6_RECVPKTINFO, the
+ * implementation requires IP_PKTINFO to be available for AF_INET.
+ * For AF_INET6 there seem to be limitations how local addresses
+ * are handled on AIX. So, disable the support for now.
+ */
+#if (defined(IP_PKTINFO) || defined(IP_RECVDSTADDR)) && defined(IPV6_RECVPKTINFO) \
+    && !defined(_AIX)
 #define SUPPORT_LOCAL_ADDR
 #endif
 #endif