static int decapsulate(struct airo_info *ai, MICBuffer *mic, etherHead *eth, u16 payLen)
{
	int      i;
	u32      micSEQ;
	miccntx  *context;
	u8       digest[4];
	mic_error micError = NONE;

	// Check if the packet is a Mic'd packet

	if (!ai->micstats.enabled) {
		//No Mic set or Mic OFF but we received a MIC'd packet.
		if (memcmp ((u8*)eth + 14, micsnap, sizeof(micsnap)) == 0) {
			ai->micstats.rxMICPlummed++;
			return ERROR;
		}
		return SUCCESS;
	}

	if (ntohs(mic->typelen) == 0x888E)
		return SUCCESS;

	if (memcmp (mic->u.snap, micsnap, sizeof(micsnap)) != 0) {
	    // Mic enabled but packet isn't Mic'd
		ai->micstats.rxMICPlummed++;
	    	return ERROR;
	}

	micSEQ = ntohl(mic->seq);            //store SEQ as CPU order

	//At this point we a have a mic'd packet and mic is enabled
	//Now do the mic error checking.

	//Receive seq must be odd
	if ( (micSEQ & 1) == 0 ) {
		ai->micstats.rxWrongSequence++;
		return ERROR;
	}

	for (i = 0; i < NUM_MODULES; i++) {
		int mcast = eth->da[0] & 1;
		//Determine proper context 
		context = mcast ? &ai->mod[i].mCtx : &ai->mod[i].uCtx;
	
		//Make sure context is valid
		if (!context->valid) {
			if (i == 0)
				micError = NOMICPLUMMED;
			continue;                
		}
	       	//DeMic it 

		if (!mic->typelen)
			mic->typelen = htons(payLen + sizeof(MICBuffer) - 2);
	
		emmh32_init(&context->seed);
		emmh32_update(&context->seed, eth->da, ETH_ALEN*2); 
		emmh32_update(&context->seed, (u8 *)&mic->typelen, sizeof(mic->typelen)+sizeof(mic->u.snap)); 
		emmh32_update(&context->seed, (u8 *)&mic->seq,sizeof(mic->seq));	
		emmh32_update(&context->seed, eth->da + ETH_ALEN*2,payLen);	
		//Calculate MIC
		emmh32_final(&context->seed, digest);
	
		if (memcmp(digest, &mic->mic, 4)) { //Make sure the mics match
		  //Invalid Mic
			if (i == 0)
				micError = INCORRECTMIC;
			continue;
		}

		//Check Sequence number if mics pass
		if (RxSeqValid(ai, context, mcast, micSEQ) == SUCCESS) {
			ai->micstats.rxSuccess++;
			return SUCCESS;
		}
		if (i == 0)
			micError = SEQUENCE;
	}

	// Update statistics
	switch (micError) {
		case NOMICPLUMMED: ai->micstats.rxMICPlummed++;   break;
		case SEQUENCE:    ai->micstats.rxWrongSequence++; break;
		case INCORRECTMIC: ai->micstats.rxIncorrectMIC++; break;
		case NONE:  break;
		case NOMIC: break;
	}
	return ERROR;
}
static int decapsulate(struct airo_info *ai, MICBuffer *mic, etherHead *eth, u16 payLen)
{
	int      i;
	u32      micSEQ;
	miccntx  *context;
	u8       digest[4];
	mic_error micError = NONE;

	 

	if (!ai->micstats.enabled) {
		 
		if (memcmp ((u8*)eth + 14, micsnap, sizeof(micsnap)) == 0) {
			ai->micstats.rxMICPlummed++;
			return ERROR;
		}
		return SUCCESS;
	}

	if (ntohs(mic->typelen) == 0x888E)
		return SUCCESS;

	if (memcmp (mic->u.snap, micsnap, sizeof(micsnap)) != 0) {
	     
		ai->micstats.rxMICPlummed++;
	    	return ERROR;
	}

	micSEQ = ntohl(mic->seq);             

	 
	 

	 
	if ( (micSEQ & 1) == 0 ) {
		ai->micstats.rxWrongSequence++;
		return ERROR;
	}

	for (i = 0; i < NUM_MODULES; i++) {
		int mcast = eth->da[0] & 1;
		 
		context = mcast ? &ai->mod[i].mCtx : &ai->mod[i].uCtx;
	
		 
		if (!context->valid) {
			if (i == 0)
				micError = NOMICPLUMMED;
			continue;                
		}
	       	 

		if (!mic->typelen)
			mic->typelen = htons(payLen + sizeof(MICBuffer) - 2);
	
		emmh32_init(&context->seed);
		emmh32_update(&context->seed, eth->da, ETH_ALEN*2); 
		emmh32_update(&context->seed, (u8 *)&mic->typelen, sizeof(mic->typelen)+sizeof(mic->u.snap)); 
		emmh32_update(&context->seed, (u8 *)&mic->seq,sizeof(mic->seq));	
		emmh32_update(&context->seed, eth->da + ETH_ALEN*2,payLen);	
		 
		emmh32_final(&context->seed, digest);
	
		if (memcmp(digest, &mic->mic, 4)) {  
		   
			if (i == 0)
				micError = INCORRECTMIC;
			continue;
		}

		 
		if (RxSeqValid(ai, context, mcast, micSEQ) == SUCCESS) {
			ai->micstats.rxSuccess++;
			return SUCCESS;
		}
		if (i == 0)
			micError = SEQUENCE;
	}

	 
	switch (micError) {
		case NOMICPLUMMED: ai->micstats.rxMICPlummed++;   break;
		case SEQUENCE:    ai->micstats.rxWrongSequence++; break;
		case INCORRECTMIC: ai->micstats.rxIncorrectMIC++; break;
		case NONE:  break;
		case NOMIC: break;
	}
	return ERROR;
}