+ /*
+ * AF_ values may, unfortunately, be platform-
+ * dependent; AF_INET isn't, because everybody
+ * used 4.2BSD's value, but AF_INET6 is, because
+ * 4.2BSD didn't have a value for it (given that
+ * IPv6 didn't exist back in the early 1980's),
+ * and they all picked their own values.
+ *
+ * This means that, if we're reading from a
+ * savefile, we need to check for all the
+ * possible values.
+ *
+ * If we're doing a live capture, we only need
+ * to check for this platform's value; however,
+ * Npcap uses 24, which isn't Windows's AF_INET6
+ * value. (Given the multiple different values,
+ * programs that read pcap files shouldn't be
+ * checking for their platform's AF_INET6 value
+ * anyway, they should check for all of the
+ * possible values. and they might as well do
+ * that even for live captures.)
+ */
+ if (cstate->bpf_pcap->rfile != NULL) {
+ /*
+ * Savefile - check for all three
+ * possible IPv6 values.
+ */
+ b0 = gen_loopback_linktype(cstate, BSD_AFNUM_INET6_BSD);
+ b1 = gen_loopback_linktype(cstate, BSD_AFNUM_INET6_FREEBSD);
+ gen_or(b0, b1);
+ b0 = gen_loopback_linktype(cstate, BSD_AFNUM_INET6_DARWIN);
+ gen_or(b0, b1);
+ return (b1);
+ } else {
+ /*
+ * Live capture, so we only need to
+ * check for the value used on this
+ * platform.
+ */
+#ifdef _WIN32
+ /*
+ * Npcap doesn't use Windows's AF_INET6,
+ * as that collides with AF_IPX on
+ * some BSDs (both have the value 23).
+ * Instead, it uses 24.
+ */
+ return (gen_loopback_linktype(cstate, 24));
+#else /* _WIN32 */
+#ifdef AF_INET6
+ return (gen_loopback_linktype(cstate, AF_INET6));
+#else /* AF_INET6 */
+ /*
+ * I guess this platform doesn't support
+ * IPv6, so we just reject all packets.
+ */
+ return gen_false(cstate);
+#endif /* AF_INET6 */
+#endif /* _WIN32 */
+ }
projects / libpcap / blobdiff