af-packet: exit in case of a fatal error

During socket creation all error cases were leading to suricata to
retry the opening of capture. This patch updates this behavior to
have fatal and recoverable error case. In case of a fatal error,
suricata is leaving cleanly.

src/source-af-packet.c

@@ -171,6 +171,11 @@ enum {
     AFP_KERNEL_DROP,
 };
 
+enum {
+    AFP_FATAL_ERROR = 1,
+    AFP_RECOVERABLE_ERROR,
+};
+
 union thdr {
     struct tpacket2_hdr *h2;
     void *raw;
@@ -1127,10 +1132,22 @@ TmEcode ReceiveAFPLoop(ThreadVars *tv, void *data, void *slot)
         /* Wait for our turn, threads before us must have opened the socket */
         while (AFPPeersListWaitTurn(ptv->mpeer)) {
             usleep(1000);
+            if (suricata_ctl_flags != 0) {
+                break;
+            }
         }
         r = AFPCreateSocket(ptv, ptv->iface, 1);
         if (r < 0) {
-            SCLogError(SC_ERR_AFP_CREATE, "Couldn't init AF_PACKET socket");
+            switch (-r) {
+                case AFP_FATAL_ERROR:
+                    SCLogError(SC_ERR_AFP_CREATE, "Couldn't init AF_PACKET socket, fatal error");
+                    /* fatal is fatal, we want suri to exit */
+                    EngineKill();
+                    //tv->aof = THV_ENGINE_EXIT;
+                    SCReturnInt(TM_ECODE_FAILED);
+                case AFP_RECOVERABLE_ERROR:
+                    SCLogWarning(SC_ERR_AFP_CREATE, "Couldn't init AF_PACKET socket, retrying soon");
+            }
         }
         AFPPeersListReachedInc();
     }
@@ -1346,6 +1363,7 @@ frame size: TPACKET_ALIGN(snaplen + TPACKET_ALIGN(TPACKET_ALIGN(tp_hdrlen) + siz
 static int AFPCreateSocket(AFPThreadVars *ptv, char *devname, int verbose)
 {
     int r;
+    int ret = AFP_FATAL_ERROR;
     struct packet_mreq sock_params;
     struct sockaddr_ll bind_address;
     int order;
@@ -1367,6 +1385,7 @@ static int AFPCreateSocket(AFPThreadVars *ptv, char *devname, int verbose)
     if (bind_address.sll_ifindex == -1) {
         if (verbose)
             SCLogError(SC_ERR_AFP_CREATE, "Couldn't find iface %s", devname);
+        ret = AFP_RECOVERABLE_ERROR;
         goto socket_err;
     }
 
@@ -1423,6 +1442,7 @@ static int AFPCreateSocket(AFPThreadVars *ptv, char *devname, int verbose)
                         devname, strerror(errno));
             }
         }
+        ret = AFP_RECOVERABLE_ERROR;
         goto frame_err;
     }
 
@@ -1450,6 +1470,7 @@ static int AFPCreateSocket(AFPThreadVars *ptv, char *devname, int verbose)
                     "Can not acces to interface '%s'",
                     ptv->iface);
         }
+        ret = AFP_RECOVERABLE_ERROR;
         goto frame_err;
     }
     if ((if_flags & IFF_UP) == 0) {
@@ -1458,6 +1479,7 @@ static int AFPCreateSocket(AFPThreadVars *ptv, char *devname, int verbose)
                     "Interface '%s' is down",
                     ptv->iface);
         }
+        ret = AFP_RECOVERABLE_ERROR;
         goto frame_err;
     }
 
@@ -1578,7 +1600,7 @@ socket_err:
     close(ptv->socket);
     ptv->socket = -1;
 error:
-    return -1;
+    return -ret;
 }
 
 TmEcode AFPSetBPFFilter(AFPThreadVars *ptv)