Patchwork [v3] af-packet: Add flag to distinguish VID 0 from no-vlan.

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Submitter Ben Greear
Date June 1, 2011, 4:49 p.m.
Message ID <1306946950-29360-1-git-send-email-greearb@candelatech.com>
Download mbox | patch
Permalink /patch/98219/
State Accepted
Delegated to: David Miller
Headers show

Comments

Ben Greear - June 1, 2011, 4:49 p.m.
From: Ben Greear <greearb@candelatech.com>

Currently, user-space cannot determine if a 0 tcp_vlan_tci
means there is no VLAN tag or the VLAN ID was zero.

Add flag to make this explicit.  User-space can check for
TP_STATUS_VLAN_VALID || tp_vlan_tci > 0, which will be backwards
compatible. Older could would have just checked for tp_vlan_tci,
so it will work no worse than before.

Signed-off-by: Ben Greear <greearb@candelatech.com>
---

v3:  Update brace formatting, no functional change.

:100644 100644 72bfa5a... 6d66ce1... M	include/linux/if_packet.h
:100644 100644 4005b24... f7250d5... M	net/packet/af_packet.c
 include/linux/if_packet.h |    1 +
 net/packet/af_packet.c    |   15 ++++++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)
Eric Dumazet - June 1, 2011, 5:08 p.m.
Le mercredi 01 juin 2011 à 09:49 -0700, greearb@candelatech.com a
écrit :
> From: Ben Greear <greearb@candelatech.com>
> 
> Currently, user-space cannot determine if a 0 tcp_vlan_tci
> means there is no VLAN tag or the VLAN ID was zero.
> 
> Add flag to make this explicit.  User-space can check for
> TP_STATUS_VLAN_VALID || tp_vlan_tci > 0, which will be backwards
> compatible. Older could would have just checked for tp_vlan_tci,
> so it will work no worse than before.
> 
> Signed-off-by: Ben Greear <greearb@candelatech.com>
> ---

Acked-by: Eric Dumazet <eric.dumazet@gmail.com>

Thanks


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David Miller - June 2, 2011, 4:18 a.m.
From: greearb@candelatech.com
Date: Wed,  1 Jun 2011 09:49:10 -0700

> From: Ben Greear <greearb@candelatech.com>
> 
> Currently, user-space cannot determine if a 0 tcp_vlan_tci
> means there is no VLAN tag or the VLAN ID was zero.
> 
> Add flag to make this explicit.  User-space can check for
> TP_STATUS_VLAN_VALID || tp_vlan_tci > 0, which will be backwards
> compatible. Older could would have just checked for tp_vlan_tci,
> so it will work no worse than before.
> 
> Signed-off-by: Ben Greear <greearb@candelatech.com>

Applied.
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Patch

diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h
index 72bfa5a..6d66ce1 100644
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -70,6 +70,7 @@  struct tpacket_auxdata {
 #define TP_STATUS_COPY		0x2
 #define TP_STATUS_LOSING	0x4
 #define TP_STATUS_CSUMNOTREADY	0x8
+#define TP_STATUS_VLAN_VALID   0x10 /* auxdata has valid tp_vlan_tci */
 
 /* Tx ring - header status */
 #define TP_STATUS_AVAILABLE	0x0
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index 4005b24..f7250d5 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -818,7 +818,12 @@  static int tpacket_rcv(struct sk_buff *skb, struct net_device *dev,
 			getnstimeofday(&ts);
 		h.h2->tp_sec = ts.tv_sec;
 		h.h2->tp_nsec = ts.tv_nsec;
-		h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
+		if (vlan_tx_tag_present(skb)) {
+			h.h2->tp_vlan_tci = vlan_tx_tag_get(skb);
+			status |= TP_STATUS_VLAN_VALID;
+		} else {
+			h.h2->tp_vlan_tci = 0;
+		}
 		hdrlen = sizeof(*h.h2);
 		break;
 	default:
@@ -1760,8 +1765,12 @@  static int packet_recvmsg(struct kiocb *iocb, struct socket *sock,
 		aux.tp_snaplen = skb->len;
 		aux.tp_mac = 0;
 		aux.tp_net = skb_network_offset(skb);
-		aux.tp_vlan_tci = vlan_tx_tag_get(skb);
-
+		if (vlan_tx_tag_present(skb)) {
+			aux.tp_vlan_tci = vlan_tx_tag_get(skb);
+			aux.tp_status |= TP_STATUS_VLAN_VALID;
+		} else {
+			aux.tp_vlan_tci = 0;
+		}
 		put_cmsg(msg, SOL_PACKET, PACKET_AUXDATA, sizeof(aux), &aux);
 	}