/* * ip6mirror.{cc,hh} -- rewrites IP6 packet a->b to b->a * Max Poletto, Eddie Kohler, Peilei Fan * * Copyright (c) 2000 Massachusetts Institute of Technology * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, subject to the conditions * listed in the Click LICENSE file. These conditions include: you must * preserve this copyright notice, and you cannot mention the copyright * holders in advertising related to the Software without their permission. * The Software is provided WITHOUT ANY WARRANTY, EXPRESS OR IMPLIED. This * notice is a summary of the Click LICENSE file; the license in that file is * legally binding. */#include <click/config.h>#include "ip6mirror.hh"#include <clicknet/ip.h>#include <clicknet/ip6.h>#include <clicknet/udp.h>CLICK_DECLSIP6Mirror::IP6Mirror(){}IP6Mirror::~IP6Mirror(){}Packet *IP6Mirror::simple_action(Packet *p_in){  WritablePacket *p = p_in->uniqueify();  // new checksum is same as old checksum  click_ip6 *iph = p->ip6_header();  struct click_in6_addr tmpa = iph->ip6_src;  iph->ip6_src = iph->ip6_dst;  iph->ip6_dst = tmpa;  // may mirror ports as well  if ((iph->ip6_nxt == IP_PROTO_TCP || iph->ip6_nxt == IP_PROTO_UDP) &&  p->length() >= (uint32_t)(p->transport_header_offset() + 8)) {    click_udp *udph = reinterpret_cast<click_udp *>(p->transport_header());    uint16_t tmpp = udph->uh_sport;    udph->uh_sport = udph->uh_dport;    udph->uh_dport = tmpp;  }  return p;}CLICK_ENDDECLSEXPORT_ELEMENT(IP6Mirror)ELEMENT_MT_SAFE(IP6Mirror)