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[master] LPF now only uses 12-bit value from VLAN TCI for VID

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Merges in rt40591.
This commit is contained in:
Thomas Markwalder 2015-09-23 09:37:51 -04:00
parent 7a6187a84d
commit f10cbbface
2 changed files with 10 additions and 3 deletions
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7
RELNOTES
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@ -54,6 +54,13 @@ by Eric Young (eay@cryptsoft.com).
Changes since 4.3.3
- The linux packet fitler code now correctly treats only least significant
12 bits an inbound packet's TCI value as the VLAN id (per IEEE 802.1Q).
Prior to this it was using the entire 16 bit value as the VLAN id and
incorrectly discarding packets. Thanks to Jiri Popelka at Red Hat for
reporting this issue and supplying its patch.
[ISC-Bugs #40591]
- Corrected a static analyzer warning in common/execute.c
[ISC-Bugs #40374]

6
common/lpf.c
View File

@ -422,10 +422,10 @@ ssize_t receive_packet (interface, buf, len, from, hfrom)
if (cmsg->cmsg_level == SOL_PACKET &&
cmsg->cmsg_type == PACKET_AUXDATA) {
struct tpacket_auxdata *aux = (void *)CMSG_DATA(cmsg);
/* Discard packets with stripped vlan id */
#ifdef VLAN_TCI_PRESENT
if (aux->tp_vlan_tci != 0)
/* Discard packets with stripped vlan id */
/* VLAN ID is only bottom 12-bits of TCI */
if (aux->tp_vlan_tci & 0x0fff)
return 0;
#endif