Function in_cksum_skip

freebsd/arm/arm/in_cksum.c:105–145

}

u_short
in_cksum_skip(struct mbuf *m, int len, int skip)
{
	u_int64_t sum = 0;
	int mlen = 0;
	int clen = 0;
	caddr_t addr;
	union q_util q_util;
	union l_util l_util;

        len -= skip;
        for (; skip && m; m = m->m_next) {
                if (m->m_len > skip) {
                        mlen = m->m_len - skip;
			addr = mtod(m, caddr_t) + skip;
                        goto skip_start;
                } else {
                        skip -= m->m_len;
                }
        }

	for (; m && len; m = m->m_next) {
		if (m->m_len == 0)
			continue;
		mlen = m->m_len;
		addr = mtod(m, caddr_t);
skip_start:
		if (len < mlen)
			mlen = len;

		if ((clen ^ (int) addr) & 1)
		    sum += _do_cksum(addr, mlen) << 8;
		else
		    sum += _do_cksum(addr, mlen);

		clen += mlen;
		len -= mlen;
	}
	REDUCE16;
	return (~sum & 0xffff);
}

u_int in_cksum_hdr(const struct ip *ip)
{