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authorHerbert Xu <herbert@gondor.apana.org.au>2007-02-04 23:31:32 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-02-08 12:38:46 -0800
commit8dc4194474159660d7f37c495e3fc3f10d0db8cc (patch)
tree33df4345a29ce4d77ebb716796687753d8f89218 /include
parent[IPV4/IPV6]: Always wait for IPSEC SA resolution in socket contexts. (diff)
downloadlinux-dev-8dc4194474159660d7f37c495e3fc3f10d0db8cc.tar.xz
linux-dev-8dc4194474159660d7f37c495e3fc3f10d0db8cc.zip
[PACKET]: Add optional checksum computation for recvmsg
This patch is needed to make ISC's DHCP server (and probably other DHCP servers/clients using AF_PACKET) to be able to serve another client on the same Xen host. The problem is that packets between different domains on the same Xen host only have partial checksums. Unfortunately this piece of information is not passed along in AF_PACKET unless you're using the mmap interface. Since dhcpd doesn't support packet-mmap, UDP packets from the same host come out with apparently bogus checksums. This patch adds a mechanism for AF_PACKET recvmsg(2) to return the status along with the packet. It does so by adding a new cmsg that contains this information along with some other relevant data such as the original packet length. I didn't include the time stamp information since there is already a cmsg for that. This patch also changes the mmap code to set the CSUMNOTREADY flag on all packets instead of just outoing packets on cooked sockets. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/if_packet.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/if_packet.h b/include/linux/if_packet.h
index 99393ef3af39..f3de05c30678 100644
--- a/include/linux/if_packet.h
+++ b/include/linux/if_packet.h
@@ -41,6 +41,7 @@ struct sockaddr_ll
#define PACKET_RX_RING 5
#define PACKET_STATISTICS 6
#define PACKET_COPY_THRESH 7
+#define PACKET_AUXDATA 8
struct tpacket_stats
{
@@ -48,6 +49,15 @@ struct tpacket_stats
unsigned int tp_drops;
};
+struct tpacket_auxdata
+{
+ __u32 tp_status;
+ __u32 tp_len;
+ __u32 tp_snaplen;
+ __u16 tp_mac;
+ __u16 tp_net;
+};
+
struct tpacket_hdr
{
unsigned long tp_status;