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e1000: Fixing the packet address filtering procedure 

Previously, if promiscuous unicast was enabled, a packet was received
straight away, even if it was a multicast or a broadcast packet. This
patch fixes that behavior, while making the filtering procedure a bit
more human-readable.

Signed-off-by: Leonid Bloch <leonid.bloch@ravellosystems.com>
Signed-off-by: Dmitry Fleytman <dmitry.fleytman@ravellosystems.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
master
Leonid Bloch 2015-11-11 15:52:45 +02:00 committed by Jason Wang
parent 45e9376471
commit 4aeea330f0
1 changed files with 7 additions and 3 deletions
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10
hw/net/e1000.c
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@ -872,6 +872,7 @@ receive_filter(E1000State *s, const uint8_t *buf, int size)
static const uint8_t bcast[] = {0xff, 0xff, 0xff, 0xff, 0xff, 0xff};
static const int mta_shift[] = {4, 3, 2, 0};
uint32_t f, rctl = s->mac_reg[RCTL], ra[2], *rp;
int isbcast = !memcmp(buf, bcast, sizeof bcast), ismcast = (buf[0] & 1);
if (is_vlan_packet(s, buf) && vlan_rx_filter_enabled(s)) {
uint16_t vid = be16_to_cpup((uint16_t *)(buf + 14));
@ -881,14 +882,17 @@ receive_filter(E1000State *s, const uint8_t *buf, int size)
return 0;
}
if (rctl & E1000_RCTL_UPE) // promiscuous
if (!isbcast && !ismcast && (rctl & E1000_RCTL_UPE)) { /* promiscuous ucast */
return 1;
}
if ((buf[0] & 1) && (rctl & E1000_RCTL_MPE)) // promiscuous mcast
if (ismcast && (rctl & E1000_RCTL_MPE)) { /* promiscuous mcast */
return 1;
}
if ((rctl & E1000_RCTL_BAM) && !memcmp(buf, bcast, sizeof bcast))
if (isbcast && (rctl & E1000_RCTL_BAM)) { /* broadcast enabled */
return 1;
}
for (rp = s->mac_reg + RA; rp < s->mac_reg + RA + 32; rp += 2) {
if (!(rp[1] & E1000_RAH_AV))