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add placeholder ipv4 ebpf tethering offload programs

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Additionally better document tether stats/limit keys/value.

Test: atest, TreeHugger, the programs load
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I1e1832fc4f5a6704e00ea99ca377988c52a82eb1
This commit is contained in:
Maciej Żenczykowski
2021-01-20 13:34:17 -08:00
parent 73dc23c4ea
commit 088fe1983b
1 changed files with 45 additions and 8 deletions
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53
Tethering/bpf_progs/offload.c
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@@ -24,18 +24,23 @@
#include "bpf_net_helpers.h"
#include "netdbpf/bpf_shared.h"
DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, TetherDownstream6Value, 64,
AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_upstream6_map, HASH, TetherUpstream6Key, TetherUpstream6Value, 64,
AID_NETWORK_STACK)
// Tethering stats, indexed by upstream interface.
DEFINE_BPF_MAP_GRW(tether_stats_map, HASH, uint32_t, TetherStatsValue, 16, AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_stats_map, HASH, TetherStatsKey, TetherStatsValue, 16, AID_NETWORK_STACK)
// Tethering data limit, indexed by upstream interface.
// (tethering allowed when stats[iif].rxBytes + stats[iif].txBytes < limit[iif])
DEFINE_BPF_MAP_GRW(tether_limit_map, HASH, uint32_t, uint64_t, 16, AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_limit_map, HASH, TetherLimitKey, TetherLimitValue, 16, AID_NETWORK_STACK)
// ----- IPv6 Support -----
DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, TetherDownstream6Value, 64,
AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_downstream64_map, HASH, TetherDownstream64Key, TetherDownstream64Value,
64, AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_upstream6_map, HASH, TetherUpstream6Key, TetherUpstream6Value, 64,
AID_NETWORK_STACK)
static inline __always_inline int do_forward(struct __sk_buff* skb, const bool is_ethernet,
const bool downstream) {
@@ -256,5 +261,37 @@ DEFINE_BPF_PROG_KVER_RANGE("schedcls/tether_upstream6_rawip$stub", AID_ROOT, AID
return TC_ACT_OK;
}
// ----- IPv4 Support -----
DEFINE_BPF_MAP_GRW(tether_downstream4_map, HASH, TetherDownstream4Key, TetherDownstream4Value, 64,
AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_upstream4_map, HASH, TetherUpstream4Key, TetherUpstream4Value, 64,
AID_NETWORK_STACK)
DEFINE_BPF_PROG("schedcls/tether_downstream4_ether", AID_ROOT, AID_NETWORK_STACK,
sched_cls_tether_downstream4_ether)
(struct __sk_buff* skb) {
return TC_ACT_OK;
}
DEFINE_BPF_PROG("schedcls/tether_downstream4_rawip", AID_ROOT, AID_NETWORK_STACK,
sched_cls_tether_downstream4_rawip)
(struct __sk_buff* skb) {
return TC_ACT_OK;
}
DEFINE_BPF_PROG("schedcls/tether_upstream4_ether", AID_ROOT, AID_NETWORK_STACK,
sched_cls_tether_upstream4_ether)
(struct __sk_buff* skb) {
return TC_ACT_OK;
}
DEFINE_BPF_PROG("schedcls/tether_upstream4_rawip", AID_ROOT, AID_NETWORK_STACK,
sched_cls_tether_upstream4_rawip)
(struct __sk_buff* skb) {
return TC_ACT_OK;
}
LICENSE("Apache 2.0");
CRITICAL("netd");