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opusrtp: DLT_LINUX_SLL support (interface "any")

--- a/src/opusrtp.c

+++ b/src/opusrtp.c

@@ -911,6 +911,7 @@

       packet += header_size;

       size -= header_size;

       break;

+

     case DLT_NULL:

       if (parse_loop_header(packet, size, &loop)) {

         fprintf(stderr, "error parsing loopback header\n");

@@ -924,6 +925,35 @@

       packet += LOOP_HEADER_LEN;

       size -= LOOP_HEADER_LEN;

       break;

+

+# ifdef DLT_LINUX_SLL

+    case DLT_LINUX_SLL:

+      if (size < 16) {

+        fprintf(stderr, "Packet too short for LINUX_SLL\n");

+        return;

+      } else {

+        int packet_type = rbe16(packet);

+        int arphrd_type = rbe16(packet + 2);

+        int addr_len = rbe16(packet + 4);

+        int proto_type = rbe16(packet + 14);

+        int i;

+        fprintf(stderr, "  LINUX_SLL %d %d %#04x",

+                packet_type, arphrd_type, proto_type);

+        if (addr_len > 8) addr_len = 8;

+        for (i = 0; i < addr_len; ++i) {

+          fprintf(stderr, "%c%02x", i ? ':' : ' ', packet[6 + i]);

+        }

+        fprintf(stderr, "\n");

+        if (proto_type != 0x0800 && proto_type != 0x86dd) {

+          fprintf(stderr, "skipping packet: not IP\n");

+          return;

+        }

+        packet += 16;

+        size -= 16;

+      }

+      break;

+# endif

+

     default:

       fprintf(stderr, "skipping packet: unrecognized linktype %d\n",

           params->linktype);