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

makr73 · t8m · commit 52cd2a49c53e · 2025-12-11T13:19:11.000+01:00
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 openssl#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 openssl#29334)
diff --git 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
