bs.c ss.c wifire_bs_comm.h/c wifire_ss_comm.h/c

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1 Functionality and Implementation: Note: Below boxes specify the modules/methods which are implemented by Sameer n Shravan. First line indicate file name. The BLUE colored method/file indicates which we can push directly into the kernel, but some of them may need changes. We can delete RED colored method/file(s) directly. bs.c static void signal_handler(int signo); void thread_handler(void *v); int main(void); ss.c static void signal_handler(int signo); int main(int argc, char *argv); wifire_bs_comm.h/c unsigned int get_no_of_st(void); void * recvpacket(int, unsigned char *); unsigned int wifire_setalarm(unsigned int, unsigned int); void doit_bs(); unsigned char getpackettype(wifire_mac_pdu *); char getindex(int); void getnextfreest(void); wifire_ss_comm.h/c void * recvpacket(int, unsigned char *); qinchar * selfslotintervals(wifire_beacon_message *); void doit_ss(); unsigned char getpackettype(wifire_mac_pdu *); unsigned int wifire_setalarm(unsigned int, unsigned int);

2 wifire_fdrep.h/c void showtill(void); void nextfreefd(void); void delfd(int); void wifire_broadcast_beacon(void *); wifire_construct_beacon.h unsigned char isrngslot(void); wifire_beacon_message * getbeacon(void); int get_dlmap_schedule(dlmap *); int get_ulmap_schedule(ulmap *); unsigned int getnextst(int); wifire_generate_macmgt_pkt.h/c wifire_mac_pdu* wifire_create_rng_req(void); wifire_mac_pdu* wifire_create_rng_rsp(void); wifire_mac_pdu* wifire_create_reg_req(void); wifire_mac_pdu* wifire_create_reg_rsp(void); wifire_mac_pdu* wifire_create_dsa_req(void); wifire_mac_pdu* wifire_create_dsa_rsp(void); wifire_mac_pdu* wifire_create_dsc_req(void); wifire_mac_pdu* wifire_create_dsc_rsp(void); wifire_mac_pdu* wifire_create_dsd_req(void); wifire_mac_pdu* wifire_create_dsd_rsp(void); wifire_mac_pdu* wifire_create_data_pkt(void); wifire_mac_pdu* wifire_create_syn_pkt(void); wifire_stinfo.h unsigned char getstid(char *);

3 wifire_bs_comm.h/c: All the modules which are required by BS are defined. Replace all fd with corresponding B/P/CID. unsigned int get_no_of_st(void): Returns number of ST s present in the particular BS. At present we are counting no of fd (file descriptor) present in the particular BS. In general count depend on the no of PCID. void * recvpacket(int, unsigned char *): Returns packet which received from defined 'fd' or NULL if received none. Type is set to 1 for beacon and 2 for Generic MAC PDU. If it is type 2 then it identifies what kind of packet it is(reg_req, RNG_REQ etc). What about if DAT_PKT is received? unsigned int wifire_setalarm(unsigned int sec, unsigned int intv): Generates SIGALRM signal after 'sec' seconds is elapsed. void doit_bs(); : will take care of transfer and receiving of packets to/from ST /BS in particular slot(s) based on DLMAP n ULMAP which are defined by the scheduler(round Ribin) unsigned char getpackettype(wifire_mac_pdu *); : returns type of packet by looking into the header field of the given mpdu. char getindex(int st); :it returns stid (fdid). In regular case it is PCID. void getnextfreest(void): wifire_ss_comm.h/c : All the modules which are required by ST are defined. Replace all fd with corresponding B/P/CID. void * recvpacket(int, unsigned char *); : same as revpacket() in bs_comm, received packet is copy to buffer. What about the sendpacket() module? Is it necessary or not? qinchar * selfslotintervals(wifire_beacon_message *); : read ULMAP n DLMAP, identifies slots allocated for respective ST and store timing difference b/w each slot in a linked list. void doit_ss(); : Function which get executed when SIGALARM signal is captured means when packet received. Read/send packet in respective Downlink/Uplink mode. Also taken care of beacons. unsigned char getpackettype(wifire_mac_pdu *); : returns type of packet by looking into the header field of the given mpdu. unsigned int wifire_setalarm(unsigned int, unsigned int); : generates SIGALRM signal after 'sec' seconds is elapsed.

4 wifire_generate_macmgt_pkt.h/c : wifire_mac_pdu* wifire_create_xxx_yyy(void); : create xxx_yyy management packet. Where xxx ={rng, reg, dsa, dsc, dsd, data, syn} and yyy={rsp, req}. wifire_construct_beacon.h unsigned char isrngslot(void); : Not yet defined. wifire_beacon_message * getbeacon(void); : construct a beacon which includes header, dlmap and ulmap schedule. int get_dlmap_schedule(dlmap *); : Scheduling has to be done here(at present one slot per ST is allocating) for downlink. Need changes for allocating variable number of slots per ST. int get_ulmap_schedule(ulmap *); : Scheduling has to be done here(at present one slot per ST is allocating) for uplink. Need changes for allocating variable number of slots per ST. unsigned int getnextst(int); : now it is based on fd, we have to change it based on CID. wifire_stinfo.h unsigned char getstid(char *); : returns stid when ST is switched on. In main scenario it will be MAC address. wifire_fdrep.h/c : for handling fd(s). void showtill(void); void nextfreefd(void); void delfd(int); void wifire_broadcast_beacon(void *);?????????????????????????????????????? ss.c static void signal_handler(int signo); : wait for SIGALRM, if received then call doit_ss().

5 int main(int argc, char *argv); : If ST powers on then this function get the stid then listen for beacons(signal SIGALRM or receive packet????) else listen for non beacon packet. What action should take if the received packet is not a beacon is not yet defined. bs.c static void signal_handler(int signo); : wait for SIGALRM, if received then call doit_bs(). void thread_handler(void *v); : thread related stuff (create, delete). Need changes wrt CID. Assigning the B/P/CID for particular connection goes here. int main(void); :

Implementation of WiFiRe MAC protocol

Implementation of WiFiRe MAC protocol M.Tech Project defense Ranjith Kumar Madalapu (05329R08) Under the guidance of Prof. Sridhar Iyer and Prof. Anirudha Sahoo Department of Computer Science IIT Bombay