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-rw-r--r--Documentation/networking/packet_mmap.txt13
1 files changed, 10 insertions, 3 deletions
diff --git a/Documentation/networking/packet_mmap.txt b/Documentation/networking/packet_mmap.txt
index a6d7cb91069e..daa015af16a0 100644
--- a/Documentation/networking/packet_mmap.txt
+++ b/Documentation/networking/packet_mmap.txt
@@ -440,9 +440,10 @@ and the following flags apply:
+++ Capture process:
from include/linux/if_packet.h
- #define TP_STATUS_COPY 2
- #define TP_STATUS_LOSING 4
- #define TP_STATUS_CSUMNOTREADY 8
+ #define TP_STATUS_COPY (1 << 1)
+ #define TP_STATUS_LOSING (1 << 2)
+ #define TP_STATUS_CSUMNOTREADY (1 << 3)
+ #define TP_STATUS_CSUM_VALID (1 << 7)
TP_STATUS_COPY : This flag indicates that the frame (and associated
meta information) has been truncated because it's
@@ -466,6 +467,12 @@ TP_STATUS_CSUMNOTREADY: currently it's used for outgoing IP packets which
reading the packet we should not try to check the
checksum.
+TP_STATUS_CSUM_VALID : This flag indicates that at least the transport
+ header checksum of the packet has been already
+ validated on the kernel side. If the flag is not set
+ then we are free to check the checksum by ourselves
+ provided that TP_STATUS_CSUMNOTREADY is also not set.
+
for convenience there are also the following defines:
#define TP_STATUS_KERNEL 0