Commit b5a87d26 authored by Gertjan Halkes's avatar Gertjan Halkes Committed by Jan Kiszka
Browse files

make user networking hostfwd work with restrict=y 

This patch allows the hostfwd option to override the restrict=y setting in
the user network stack, as explicitly stated in the documentation on the
restrict option:

     restrict=on|off
         If this option is enabled, the guest will be isolated, i.e. it
         will not be able to contact the host and no guest IP packets
         will be routed over the host to the outside. This option does
         not affect any explicitly set forwarding rules.

Qemu bug tracker:
https://bugs.launchpad.net/qemu/+bug/829455



Signed-off-by: default avatarGertjan Halkes <qemu@ghalkes.nl>
Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
parent 68756ba8

slirp/tcp_input.c

+16 −10
Original line number Diff line number Diff line
@@ -316,16 +316,6 @@ tcp_input(struct mbuf *m, int iphlen, struct socket *inso) 
	m->m_data += sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);

	m->m_len  -= sizeof(struct tcpiphdr)+off-sizeof(struct tcphdr);



    if (slirp->restricted) {

        for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {

            if (ex_ptr->ex_fport == ti->ti_dport &&

                ti->ti_dst.s_addr == ex_ptr->ex_addr.s_addr) {

                break;

            }

        }

        if (!ex_ptr)

            goto drop;

    }

	/*

	 * Locate pcb for segment.

	 */
@@ -355,6 +345,22 @@ findso: 
	 * as if it was LISTENING, and continue...

	 */

        if (so == NULL) {

          if (slirp->restricted) {

            /* Any hostfwds will have an existing socket, so we only get here

             * for non-hostfwd connections. These should be dropped, unless it

             * happens to be a guestfwd.

             */

            for (ex_ptr = slirp->exec_list; ex_ptr; ex_ptr = ex_ptr->ex_next) {

                if (ex_ptr->ex_fport == ti->ti_dport &&

                    ti->ti_dst.s_addr == ex_ptr->ex_addr.s_addr) {

                    break;

                }

            }

            if (!ex_ptr) {

                goto dropwithreset;

            }

          }



	  if ((tiflags & (TH_SYN|TH_FIN|TH_RST|TH_URG|TH_ACK)) != TH_SYN)

	    goto dropwithreset;