Move definitions used by tethering bpf code into the module.
Bug: 167645754 Test: m com.android.tethering Change-Id: Ia4fb1201e5f4e0c35baba7865b26b4cec0945a64
This commit is contained in:
Lorenzo Colitti
@@ -16,6 +16,11 @@
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#pragma once
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#include <linux/if.h>
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#include <linux/if_ether.h>
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#include <linux/in.h>
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#include <linux/in6.h>
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// Common definitions for BPF code in the tethering mainline module.
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// These definitions are available to:
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// - The BPF programs in Tethering/bpf_progs/
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@@ -59,3 +64,151 @@ static const char *bpf_tether_errors[] = {
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BPF_TETHER_ERRORS
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};
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#undef ERR
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// This header file is shared by eBPF kernel programs (C) and netd (C++) and
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// some of the maps are also accessed directly from Java mainline module code.
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//
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// Hence: explicitly pad all relevant structures and assert that their size
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// is the sum of the sizes of their fields.
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#define STRUCT_SIZE(name, size) _Static_assert(sizeof(name) == (size), "Incorrect struct size.")
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#define BPF_PATH_TETHER BPF_PATH "tethering/"
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#define TETHER_STATS_MAP_PATH BPF_PATH_TETHER "map_offload_tether_stats_map"
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typedef uint32_t TetherStatsKey; // upstream ifindex
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typedef struct {
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uint64_t rxPackets;
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uint64_t rxBytes;
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uint64_t rxErrors;
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uint64_t txPackets;
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uint64_t txBytes;
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uint64_t txErrors;
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} TetherStatsValue;
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STRUCT_SIZE(TetherStatsValue, 6 * 8); // 48
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#define TETHER_LIMIT_MAP_PATH BPF_PATH_TETHER "map_offload_tether_limit_map"
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typedef uint32_t TetherLimitKey; // upstream ifindex
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typedef uint64_t TetherLimitValue; // in bytes
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#define TETHER_DOWNSTREAM6_TC_PROG_RAWIP_NAME "prog_offload_schedcls_tether_downstream6_rawip"
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#define TETHER_DOWNSTREAM6_TC_PROG_ETHER_NAME "prog_offload_schedcls_tether_downstream6_ether"
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#define TETHER_DOWNSTREAM6_TC_PROG_RAWIP_PATH BPF_PATH_TETHER TETHER_DOWNSTREAM6_TC_PROG_RAWIP_NAME
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#define TETHER_DOWNSTREAM6_TC_PROG_ETHER_PATH BPF_PATH_TETHER TETHER_DOWNSTREAM6_TC_PROG_ETHER_NAME
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#define TETHER_DOWNSTREAM6_MAP_PATH BPF_PATH_TETHER "map_offload_tether_downstream6_map"
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// For now tethering offload only needs to support downstreams that use 6-byte MAC addresses,
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// because all downstream types that are currently supported (WiFi, USB, Bluetooth and
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// Ethernet) have 6-byte MAC addresses.
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typedef struct {
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uint32_t iif; // The input interface index
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// TODO: extend this to include dstMac
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struct in6_addr neigh6; // The destination IPv6 address
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} TetherDownstream6Key;
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STRUCT_SIZE(TetherDownstream6Key, 4 + 16); // 20
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typedef struct {
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uint32_t oif; // The output interface to redirect to
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struct ethhdr macHeader; // includes dst/src mac and ethertype (zeroed iff rawip egress)
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uint16_t pmtu; // The maximum L3 output path/route mtu
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} Tether6Value;
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STRUCT_SIZE(Tether6Value, 4 + 14 + 2); // 20
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#define TETHER_DOWNSTREAM64_MAP_PATH BPF_PATH_TETHER "map_offload_tether_downstream64_map"
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typedef struct {
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uint32_t iif; // The input interface index
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uint8_t dstMac[ETH_ALEN]; // destination ethernet mac address (zeroed iff rawip ingress)
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uint16_t l4Proto; // IPPROTO_TCP/UDP/...
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struct in6_addr src6; // source &
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struct in6_addr dst6; // destination IPv6 addresses
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__be16 srcPort; // source &
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__be16 dstPort; // destination tcp/udp/... ports
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} TetherDownstream64Key;
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STRUCT_SIZE(TetherDownstream64Key, 4 + 6 + 2 + 16 + 16 + 2 + 2); // 48
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typedef struct {
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uint32_t oif; // The output interface to redirect to
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struct ethhdr macHeader; // includes dst/src mac and ethertype (zeroed iff rawip egress)
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uint16_t pmtu; // The maximum L3 output path/route mtu
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struct in_addr src4; // source &
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struct in_addr dst4; // destination IPv4 addresses
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__be16 srcPort; // source &
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__be16 outPort; // destination tcp/udp/... ports
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uint64_t lastUsed; // Kernel updates on each use with bpf_ktime_get_boot_ns()
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} TetherDownstream64Value;
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STRUCT_SIZE(TetherDownstream64Value, 4 + 14 + 2 + 4 + 4 + 2 + 2 + 8); // 40
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#define TETHER_UPSTREAM6_TC_PROG_RAWIP_NAME "prog_offload_schedcls_tether_upstream6_rawip"
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#define TETHER_UPSTREAM6_TC_PROG_ETHER_NAME "prog_offload_schedcls_tether_upstream6_ether"
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#define TETHER_UPSTREAM6_TC_PROG_RAWIP_PATH BPF_PATH_TETHER TETHER_UPSTREAM6_TC_PROG_RAWIP_NAME
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#define TETHER_UPSTREAM6_TC_PROG_ETHER_PATH BPF_PATH_TETHER TETHER_UPSTREAM6_TC_PROG_ETHER_NAME
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#define TETHER_UPSTREAM6_MAP_PATH BPF_PATH_TETHER "map_offload_tether_upstream6_map"
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typedef struct {
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uint32_t iif; // The input interface index
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// TODO: extend this to include dstMac and src ip /64 subnet
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} TetherUpstream6Key;
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STRUCT_SIZE(TetherUpstream6Key, 4);
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#define TETHER_DOWNSTREAM4_TC_PROG_RAWIP_NAME "prog_offload_schedcls_tether_downstream4_rawip"
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#define TETHER_DOWNSTREAM4_TC_PROG_ETHER_NAME "prog_offload_schedcls_tether_downstream4_ether"
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#define TETHER_DOWNSTREAM4_TC_PROG_RAWIP_PATH BPF_PATH_TETHER TETHER_DOWNSTREAM4_TC_PROG_RAWIP_NAME
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#define TETHER_DOWNSTREAM4_TC_PROG_ETHER_PATH BPF_PATH_TETHER TETHER_DOWNSTREAM4_TC_PROG_ETHER_NAME
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#define TETHER_DOWNSTREAM4_MAP_PATH BPF_PATH_TETHER "map_offload_tether_downstream4_map"
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#define TETHER_UPSTREAM4_TC_PROG_RAWIP_NAME "prog_offload_schedcls_tether_upstream4_rawip"
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#define TETHER_UPSTREAM4_TC_PROG_ETHER_NAME "prog_offload_schedcls_tether_upstream4_ether"
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#define TETHER_UPSTREAM4_TC_PROG_RAWIP_PATH BPF_PATH_TETHER TETHER_UPSTREAM4_TC_PROG_RAWIP_NAME
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#define TETHER_UPSTREAM4_TC_PROG_ETHER_PATH BPF_PATH_TETHER TETHER_UPSTREAM4_TC_PROG_ETHER_NAME
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#define TETHER_UPSTREAM4_MAP_PATH BPF_PATH_TETHER "map_offload_tether_upstream4_map"
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typedef struct {
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uint32_t iif; // The input interface index
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uint8_t dstMac[ETH_ALEN]; // destination ethernet mac address (zeroed iff rawip ingress)
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uint16_t l4Proto; // IPPROTO_TCP/UDP/...
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struct in_addr src4; // source &
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struct in_addr dst4; // destination IPv4 addresses
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__be16 srcPort; // source &
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__be16 dstPort; // destination TCP/UDP/... ports
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} Tether4Key;
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STRUCT_SIZE(Tether4Key, 4 + 6 + 2 + 4 + 4 + 2 + 2); // 24
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typedef struct {
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uint32_t oif; // The output interface to redirect to
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struct ethhdr macHeader; // includes dst/src mac and ethertype (zeroed iff rawip egress)
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uint16_t pmtu; // Maximum L3 output path/route mtu
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struct in6_addr src46; // source & (always IPv4 mapped for downstream)
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struct in6_addr dst46; // destination IP addresses (may be IPv4 mapped or IPv6 for upstream)
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__be16 srcPort; // source &
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__be16 dstPort; // destination tcp/udp/... ports
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uint64_t last_used; // Kernel updates on each use with bpf_ktime_get_boot_ns()
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} Tether4Value;
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STRUCT_SIZE(Tether4Value, 4 + 14 + 2 + 16 + 16 + 2 + 2 + 8); // 64
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#define TETHER_DOWNSTREAM_XDP_PROG_RAWIP_NAME "prog_offload_xdp_tether_downstream_rawip"
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#define TETHER_DOWNSTREAM_XDP_PROG_ETHER_NAME "prog_offload_xdp_tether_downstream_ether"
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#define TETHER_DOWNSTREAM_XDP_PROG_RAWIP_PATH BPF_PATH_TETHER TETHER_DOWNSTREAM_XDP_PROG_RAWIP_NAME
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#define TETHER_DOWNSTREAM_XDP_PROG_ETHER_PATH BPF_PATH_TETHER TETHER_DOWNSTREAM_XDP_PROG_ETHER_NAME
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#define TETHER_UPSTREAM_XDP_PROG_RAWIP_NAME "prog_offload_xdp_tether_upstream_rawip"
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#define TETHER_UPSTREAM_XDP_PROG_ETHER_NAME "prog_offload_xdp_tether_upstream_ether"
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#define TETHER_UPSTREAM_XDP_PROG_RAWIP_PATH BPF_PATH_TETHER TETHER_UPSTREAM_XDP_PROG_RAWIP_NAME
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#define TETHER_UPSTREAM_XDP_PROG_ETHER_PATH BPF_PATH_TETHER TETHER_UPSTREAM_XDP_PROG_ETHER_NAME
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#undef STRUCT_SIZE
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@@ -27,7 +27,6 @@
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#include "bpf_helpers.h"
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#include "bpf_net_helpers.h"
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#include "bpf_tethering.h"
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#include "netdbpf/bpf_shared.h"
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// From kernel:include/net/ip.h
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#define IP_DF 0x4000 // Flag: "Don't Fragment"
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@@ -20,7 +20,7 @@
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#include "bpf_helpers.h"
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#include "bpf_net_helpers.h"
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#include "netdbpf/bpf_shared.h"
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#include "bpf_tethering.h"
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// Used only by TetheringPrivilegedTests, not by production code.
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DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, Tether6Value, 16,
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