int
in_cksum(struct mbuf *m, int len)
{
u_int64_t sum = 0;
int mlen = 0;
int clen = 0;
caddr_t addr;
union l_util l_util;
union q_util q_util;
for (; m && len; m = m->m_next) {
if (m->m_len == 0)
continue;
mlen = m->m_len;
if (len < mlen)
mlen = len;
addr = mtod(m, caddr_t);
if ((clen ^ (long) addr) & 1)
sum += in_cksumdata(addr, mlen) << 8;
else
sum += in_cksumdata(addr, mlen);
clen += mlen;
len -= mlen;
}
REDUCE16;
return (~sum & 0xffff);
}
int
in4_cksum(struct mbuf *m, u_int8_t nxt, int off, int len)
{
u_int64_t sum = 0;
int mlen = 0;
int clen = 0;
caddr_t addr;
union q_util q_util;
union l_util l_util;
struct ipovly ipov;
if (nxt != 0) {
#ifdef DEBUG
/* pseudo header */
if (off < sizeof(struct ipovly))
panic("in4_cksum: offset too short");
if (m->m_len < sizeof(struct ip))
panic("in4_cksum: bad mbuf chain");
#endif
memset(&ipov, 0, sizeof(ipov));
ipov.ih_len = htons(len);
ipov.ih_pr = nxt;
ipov.ih_src = mtod(m, struct ip *)->ip_src;
ipov.ih_dst = mtod(m, struct ip *)->ip_dst;
sum += in_cksumdata((caddr_t) &ipov, sizeof(ipov));
}
/* skip over unnecessary part */
while (m != NULL && off > 0) {
if (m->m_len > off)
break;
off -= m->m_len;
m = m->m_next;
}
for (; m && len; m = m->m_next, off = 0) {
if (m->m_len == 0)
continue;
mlen = m->m_len - off;
if (len < mlen)
mlen = len;
addr = mtod(m, caddr_t) + off;
if ((clen ^ (long) addr) & 1)
sum += in_cksumdata(addr, mlen) << 8;
else
sum += in_cksumdata(addr, mlen);
clen += mlen;
len -= mlen;
}
REDUCE16;
return (~sum & 0xffff);
}
u_int in_cksum_hdr(const struct ip *ip)
{
u_int64_t sum = in_cksumdata(ip, sizeof(struct ip));
union q_util q_util;
union l_util l_util;
REDUCE16;
return (~sum & 0xffff);
}
uint16_t ptclbsum(uint8_t * addr, int len)
{
uint64_t sum = in_cksumdata(addr, len);
union q_util q_util;
union l_util l_util;
if ((uintptr_t)addr & 1)
sum <<= 8;
REDUCE16;
return cpu_to_be16(sum);
}
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 ^ (uintptr_t) addr) & 1)
sum += in_cksumdata(addr, mlen) << 8;
else
sum += in_cksumdata(addr, mlen);
clen += mlen;
len -= mlen;
}
REDUCE16;
return (~sum & 0xffff);
}
