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/lk-master/external/lib/lwip/core/ipv4/
A Dip.c663 u32_t chk_sum = 0; local
698 chk_sum += ((u16_t*)p->payload)[i];
719 chk_sum += LWIP_MAKE_U16(proto, ttl);
732 chk_sum += LWIP_MAKE_U16(tos, iphdr->_v_hl);
736 chk_sum += iphdr->_len;
741 chk_sum += iphdr->_id;
754 chk_sum += ip4_addr_get_u32(&iphdr->src) >> 16;
755 chk_sum = (chk_sum >> 16) + (chk_sum & 0xFFFF);
756 chk_sum = (chk_sum >> 16) + chk_sum;
757 chk_sum = ~chk_sum;
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