18 lines
No EOL
434 B
C
18 lines
No EOL
434 B
C
/** Userspace TCP functions.
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*
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* @author Steffen Vogel <post@steffenvogel.de>
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* @copyright 2014-2015, Steffen Vogel
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* @license GPLv3
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*********************************************************************************/
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unsigned short tcp_csum(unsigned short *buf, int len)
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{
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unsigned long sum;
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for(sum=0; len>0; len--)
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sum += *buf++;
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sum = (sum >> 16) + (sum &0xffff);
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sum += (sum >> 16);
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return (unsigned short)(~sum);
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} |