#ifndef CLICK_DSR_H#define CLICK_DSR_H/* #include <netinet/in.h> */CLICK_DECLSstruct click_dsr { // DSR options header -- exactly one per packet  unsigned char dsr_next_header; // original IP protocol field  unsigned char dsr_reserved;  u_int16_t dsr_len;};struct click_dsr_option { // common part of option headers, used for determining type  unsigned char dsr_type;  unsigned char dsr_len;};struct DSRHop {  in_addr _ip;  unsigned char _metric;#define DSR_INVALID_HOP_METRIC 0xFF#define DSR_INVALID_ROUTE_METRIC 9999  DSRHop(IPAddress i) : _ip(i), _metric(DSR_INVALID_HOP_METRIC) {}  DSRHop(IPAddress i, unsigned char c) : _ip(i), _metric(c) {}  IPAddress ip() const { return IPAddress(_ip); }};typedef Vector<DSRHop> DSRRoute;struct click_dsr_rreq {  unsigned char dsr_type;  unsigned char dsr_len;  u_int16_t dsr_id;  in_addr target;  DSRHop addr[];  unsigned int num_addrs() const {    if ((dsr_len - 6) % sizeof(DSRHop) != 0) click_chatter("click_dsr_rreq::length() -- warning: odd length (%d %d)\n",							   dsr_len, sizeof(DSRHop));    return ((dsr_len - 6)/sizeof(DSRHop));  }  unsigned int length() const { return (dsr_len + 2); }  char *next_option() const { return ((char *)this + length()); }};struct click_dsr_rrep {  unsigned char dsr_type;  unsigned char dsr_len;  unsigned char dsr_flags;  unsigned char dsr_pad; // for alignment; against the spec  //  unsigned short dsr_id; // this doesn't exist in the spec  DSRHop addr[];  unsigned int num_addrs() const {    if ((dsr_len - 1) % sizeof(DSRHop) != 0) click_chatter("click_dsr_rrep::length() -- warning: odd length\n");    return ((dsr_len - 1)/sizeof(DSRHop));   // from the spec, sec 6.3  }  unsigned int length() const { return (dsr_len + 3); }  char *next_option() const { return ((char *)this + length()); }};struct click_dsr_rerr {  unsigned char dsr_type;  unsigned char dsr_len;  unsigned char dsr_error;// #define DSR_RERR_FLAGS_SALVAGE_MASK     0x0F  // 00001111#define DSR_RERR_TYPE_NODE_UNREACHABLE  1  unsigned char dsr_flags;  in_addr dsr_err_src;  in_addr dsr_err_dst;  // type-specific information follows here  unsigned int length() const {    //    if (dsr_error == DSR_RERR_TYPE_NODE_UNREACHABLE) return (dsr_len + 2 + 4);    //      click_chatter("click_dsr_rerr::length() -- warning: unknown err type %x\n", dsr_error);    return (dsr_len + 2);  }  char *next_option() const { return ((char *)this + length()); }};// #define DSR_SR_FLAGS_FIRSTHOPEXT_MASK 0x8000  // 1000000000000000// #define DSR_SR_FLAGS_LASTHOPEXT_MASK  0x4000  // 0100000000000000// #define DSR_SR_FLAGS_SALVAGE_MASK     0x03C0  // 0000001111000000// #define DSR_SR_FLAGS_SEGSLEFT_MASK    0x003F  // 0000000000111111struct click_dsr_source {  unsigned char dsr_type;  unsigned char dsr_len;  //  u_int16_t dsr_flags;  unsigned char dsr_salvage;  unsigned char dsr_segsleft;  DSRHop addr[];  unsigned int num_addrs() const {    if ((dsr_len - 2) % sizeof(DSRHop) != 0) click_chatter("click_dsr_source::length() -- warning: odd length\n");    return ((dsr_len - 2) / sizeof(DSRHop));  }  unsigned int length() const { return (dsr_len + 2); }  char *next_option() const { return ((char *)this + length()); }};// constants the guy doesn't use/* Constants used - need to check their values */// static const int DSR_RREQ_RETRIES = 2;// static const int DSR_NODE_TRAVERSAL_MS = 40;// static const int DSR_NET_DIAMETER = 35;// static const int DSR_NET_TRAVERSAL_MS = 3 * DSR_NODE_TRAVERSAL_MS * DSR_NET_DIAMETER / 2;// static const int DSR_RREQ_START_TTL = 2;// static const int DSR_RREQ_INCREMENT_TTL = 2;// static const int DSR_RREQ_THRESHOLD_TTL = 7;// static const int DSR_BROADCAST_RECORD_MS = 2 * DSR_NET_TRAVERSAL_MS;#define DSR_TYPE_RREP         1#define DSR_TYPE_RREQ         2#define DSR_TYPE_RERR         3#define DSR_TYPE_SOURCE_ROUTE 96// #define DSR_TYPE_ACK          32// #define DSR_TYPE_AREQ         160#define IP_PROTO_DSR          200#define DSR_SALVAGE_LIMIT     4#define DSR_LAST_HOP_IP_ANNO(p)		((p)->anno_u32(Packet::user_anno_offset + 4))#define SET_DSR_LAST_HOP_IP_ANNO(p, v)	((p)->set_anno_u32(Packet::user_anno_offset + 4, (v)))#define DSR_LAST_HOP_ETH_ANNO1(p)	((p)->anno_u16(Packet::user_anno_offset + 18))#define SET_DSR_LAST_HOP_ETH_ANNO1(p, v) ((p)->set_anno_u16(Packet::user_anno_offset + 18, (v)))#define DSR_LAST_HOP_ETH_ANNO2(p)	((p)->anno_u16(Packet::user_anno_offset + 22))#define SET_DSR_LAST_HOP_ETH_ANNO2(p, v) ((p)->set_anno_u16(Packet::user_anno_offset + 22, (v)))#define DSR_LAST_HOP_ETH_ANNO3(p)	((p)->anno_u16(Packet::user_anno_offset + 26))#define SET_DSR_LAST_HOP_ETH_ANNO3(p, v) ((p)->set_anno_u16(Packet::user_anno_offset + 26, (v)))CLICK_ENDDECLS#endif