Block netlink mmap sockets in syscallbuf

src/preload/syscallbuf.c

@@ -61,6 +61,7 @@
 #include <linux/ioctl.h>
 #include <linux/mman.h>
 #include <linux/net.h>
+#include <linux/netlink.h>
 #include <linux/perf_event.h>
 #include <linux/ptrace.h>
 #include <linux/quota.h>
@@ -81,6 +82,10 @@
 #include "preload_interface.h"
 #include "rr/rr.h"
 
+#ifndef SOL_NETLINK
+#define SOL_NETLINK 270
+#endif
+
 #ifndef BTRFS_IOCTL_MAGIC
 #define BTRFS_IOCTL_MAGIC 0x94
 #endif
@@ -2578,6 +2583,11 @@ static long sys_setsockopt(const struct syscall_info* call) {
     // Let rr intercept this (and probably disable it)
     return traced_raw_syscall(call);
   }
+  if (level == SOL_NETLINK &&
+      (optname == NETLINK_RX_RING || optname == NETLINK_TX_RING)) {
+    // Let rr intercept this (and probably disable it)
+    return traced_raw_syscall(call);
+  }
 
   void* ptr = prep_syscall_for_fd(sockfd);
   long ret;