https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=105943
--- Comment #7 from Ed Maste <ema...@freebsd.org> ---
ip_mloopback:
/*
* Make a deep copy of the packet because we're going to
* modify the pack in order to generate checksums.
*/
copym = m_dup(m, M_NOWAIT);
...
if_simloop(ifp, copym, AF_INET, 0);
pim6_input:
mcp = m_copym(m, 0, off + PIM6_REG_MINLEN, M_NOWAIT);
...
if_simloop(mif6table[reg_mif_num].m6_ifp, m,
dst.sin6_family, 0);
ip6_mloopback:
copym = m_copym(m, 0, M_COPYALL, M_NOWAIT);
...
/*
* Make sure to deep-copy IPv6 header portion in case the data
* is in an mbuf cluster, so that we can safely override the IPv6
* header portion later.
*/
if (!M_WRITABLE(copym) ||
copym->m_len < sizeof(struct ip6_hdr)) {
copym = m_pullup(copym, sizeof(struct ip6_hdr));
if (copym == NULL)
return;
}
...
if_simloop(ifp, copym, AF_INET6, 0);
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