bionic: Notify userspace about packets with CHECKSUM_UNNECESSARY

tpacket already notifies userspace about packets filtered with
ip_summed field set to CHECKSUM_PARTIAL.

Add a new flag for tpacket framework to pass to userspace for
packets with ip_summed field CHECKSUM_UNNECESSARY.

Change-Id: Icf308143a76269ff38c3238f1ca235b97e57dde9

1 files changed, 30 insertions, 28 deletions

diff --git a/libc/kernel/uapi/linux/if_packet.h b/libc/kernel/uapi/linux/if_packet.h
index 6e9ae6a..ba283c6 100644
--- a/libc/kernel/uapi/linux/if_packet.h
+++ b/libc/kernel/uapi/linux/if_packet.h
@@ -119,143 +119,145 @@ struct tpacket_auxdata {
 #define TP_STATUS_VLAN_VALID (1 << 4)
 #define TP_STATUS_BLK_TMO (1 << 5)
 #define TP_STATUS_VLAN_TPID_VALID (1 << 6)
-#define TP_STATUS_AVAILABLE 0
+#define TP_STATUS_CSUM_UNNECESSARY (1 << 7)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define TP_STATUS_AVAILABLE 0
 #define TP_STATUS_SEND_REQUEST (1 << 0)
 #define TP_STATUS_SENDING (1 << 1)
 #define TP_STATUS_WRONG_FORMAT (1 << 2)
-#define TP_STATUS_TS_SOFTWARE (1 << 29)
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define TP_STATUS_TS_SOFTWARE (1 << 29)
 #define TP_STATUS_TS_SYS_HARDWARE (1 << 30)
 #define TP_STATUS_TS_RAW_HARDWARE (1 << 31)
 #define TP_FT_REQ_FILL_RXHASH 0x1
-struct tpacket_hdr {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct tpacket_hdr {
   unsigned long tp_status;
   unsigned int tp_len;
   unsigned int tp_snaplen;
-  unsigned short tp_mac;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  unsigned short tp_mac;
   unsigned short tp_net;
   unsigned int tp_sec;
   unsigned int tp_usec;
-};
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
 #define TPACKET_ALIGNMENT 16
 #define TPACKET_ALIGN(x) (((x) + TPACKET_ALIGNMENT - 1) & ~(TPACKET_ALIGNMENT - 1))
 #define TPACKET_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket_hdr)) + sizeof(struct sockaddr_ll))
-struct tpacket2_hdr {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct tpacket2_hdr {
   __u32 tp_status;
   __u32 tp_len;
   __u32 tp_snaplen;
-  __u16 tp_mac;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __u16 tp_mac;
   __u16 tp_net;
   __u32 tp_sec;
   __u32 tp_nsec;
-  __u16 tp_vlan_tci;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __u16 tp_vlan_tci;
   __u16 tp_vlan_tpid;
   __u8 tp_padding[4];
 };
-struct tpacket_hdr_variant1 {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct tpacket_hdr_variant1 {
   __u32 tp_rxhash;
   __u32 tp_vlan_tci;
   __u16 tp_vlan_tpid;
-  __u16 tp_padding;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __u16 tp_padding;
 };
 struct tpacket3_hdr {
   __u32 tp_next_offset;
-  __u32 tp_sec;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __u32 tp_sec;
   __u32 tp_nsec;
   __u32 tp_snaplen;
   __u32 tp_len;
-  __u32 tp_status;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __u32 tp_status;
   __u16 tp_mac;
   __u16 tp_net;
   union {
-    struct tpacket_hdr_variant1 hv1;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+    struct tpacket_hdr_variant1 hv1;
   };
   __u8 tp_padding[8];
 };
-struct tpacket_bd_ts {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct tpacket_bd_ts {
   unsigned int ts_sec;
   union {
     unsigned int ts_usec;
-    unsigned int ts_nsec;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+    unsigned int ts_nsec;
   };
 };
 struct tpacket_hdr_v1 {
-  __u32 block_status;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __u32 block_status;
   __u32 num_pkts;
   __u32 offset_to_first_pkt;
   __u32 blk_len;
-  __aligned_u64 seq_num;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __aligned_u64 seq_num;
   struct tpacket_bd_ts ts_first_pkt, ts_last_pkt;
 };
 union tpacket_bd_header_u {
-  struct tpacket_hdr_v1 bh1;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  struct tpacket_hdr_v1 bh1;
 };
 struct tpacket_block_desc {
   __u32 version;
-  __u32 offset_to_priv;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  __u32 offset_to_priv;
   union tpacket_bd_header_u hdr;
 };
 #define TPACKET2_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket2_hdr)) + sizeof(struct sockaddr_ll))
-#define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define TPACKET3_HDRLEN (TPACKET_ALIGN(sizeof(struct tpacket3_hdr)) + sizeof(struct sockaddr_ll))
 enum tpacket_versions {
   TPACKET_V1,
   TPACKET_V2,
-  TPACKET_V3
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  TPACKET_V3
 };
 struct tpacket_req {
   unsigned int tp_block_size;
-  unsigned int tp_block_nr;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  unsigned int tp_block_nr;
   unsigned int tp_frame_size;
   unsigned int tp_frame_nr;
 };
-struct tpacket_req3 {
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+struct tpacket_req3 {
   unsigned int tp_block_size;
   unsigned int tp_block_nr;
   unsigned int tp_frame_size;
-  unsigned int tp_frame_nr;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  unsigned int tp_frame_nr;
   unsigned int tp_retire_blk_tov;
   unsigned int tp_sizeof_priv;
   unsigned int tp_feature_req_word;
-};
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
 union tpacket_req_u {
   struct tpacket_req req;
   struct tpacket_req3 req3;
-};
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+};
 struct packet_mreq {
   int mr_ifindex;
   unsigned short mr_type;
-  unsigned short mr_alen;
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+  unsigned short mr_alen;
   unsigned char mr_address[8];
 };
 #define PACKET_MR_MULTICAST 0
-#define PACKET_MR_PROMISC 1
 /* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */
+#define PACKET_MR_PROMISC 1
 #define PACKET_MR_ALLMULTI 2
 #define PACKET_MR_UNICAST 3
 #endif
+/* WARNING: DO NOT EDIT, AUTO-GENERATED CODE - SEE TOP FOR INSTRUCTIONS */