+ cp += vjlen;
+ len -= vjlen;
+
+ /*
+ * At this point, cp points to the first byte of data in the
+ * packet. If we're not aligned on a 4-byte boundary, copy the
+ * data down so the ip & tcp headers will be aligned. Then back up
+ * cp by the tcp/ip header length to make room for the reconstructed
+ * header (we assume the packet we were handed has enough space to
+ * prepend 128 bytes of header).
+ */
+ if ((int)cp & 3) {
+ if (len > 0)
+ (void) ovbcopy(cp, (caddr_t)((int)cp &~ 3), len);
+ cp = (u_char *)((int)cp &~ 3);
+ }
+ cp -= hlen;
+ len += hlen;
+ BCOPY(hdr, cp, hlen);
+
+ *bufp = cp;
+ return (len);
+}