Date: Mon, 26 Aug 2002 00:37:05 +0430 From: "soheil h" <soheil_h_y@hotmail.com> To: freebsd-net@FreeBSD.ORG Subject: creating packets but cannot send Message-ID: <F583mbfJ8VrRQvXlaoY00000d4a@hotmail.com>
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Hi list
in ip_input.c::ip_input() i make
mbuf * m1;
MGETHDR(m1, M_DONTWAIT, MT_HEADER);
if(m1 != NULL){
soheilFillInIp(m1, m);
m->m_data += max_linkhdr;
m->m_len = hdrlen;
ip_forward(m1, 0);
}
at line 1615 of ip_forward() function it takes page fault error in kernel it
says the page is not present
if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(pkt_dst) == 0) {
the soheilFillInIp creates an ipPacket from incoming ip packet
as and it passes with no error on:
....
ip1 = mtod (m, struct ip *);
ip2 = mtod (m1, struct ip *);
ip2->ip_vhl = IP_VHL_BORING;
ip2->ip_dst = ip1->ip_src; // and vice versa
or
ip2->ip_sum = in_cksum_hdr(m1, sizeof(struct tcpiphdr));
....
when i do something to pass that line of ip_forward
in ip_output when it calls the in_delayed_cksum
it takes the same error
how can i solve this
i think something is in the m1 header or data that i didn't set it or ...
help me SOS
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