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Do not allow the use of the loopback interface in netmap.

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The generic support in netmap send the packets using if_transmit() and the
loopback do not support packets coming from if_transmit()/if_start().

This avoids the use of the loopback interface and the subsequent crash that
happens when the application send packets to the loopback interface.

Details in:	https://github.com/luigirizzo/netmap/issues/322
Reported by:	Vincenzo Maffione <v.maffione@gmail.com>
Sponsored by:	Rubicon Communications, LLC (Netgate)
This commit is contained in:
Luiz Otavio O Souza 2017-07-21 03:28:35 +00:00
parent 9ffd0f54a7
commit a02dbe4ca1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=321317
1 changed files with 8 additions and 0 deletions
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8
sys/dev/netmap/netmap_generic.c
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@ -75,6 +75,7 @@ __FBSDID("$FreeBSD$");
#include <sys/socket.h> /* sockaddrs */
#include <sys/selinfo.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_var.h>
#include <machine/bus.h> /* bus_dmamap_* in netmap_kern.h */
@ -1198,6 +1199,13 @@ generic_netmap_attach(struct ifnet *ifp)
int retval;
u_int num_tx_desc, num_rx_desc;
#ifdef __FreeBSD__
if (ifp->if_type == IFT_LOOP) {
D("if_loop is not supported by %s", __func__);
return EINVAL;
}
#endif
num_tx_desc = num_rx_desc = netmap_generic_ringsize; /* starting point */
nm_os_generic_find_num_desc(ifp, &num_tx_desc, &num_rx_desc); /* ignore errors */