/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "netd.h"
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#include <linux/bpf.h>
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SEC("cgroupskb/ingress/stats")
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int bpf_cgroup_ingress(struct __sk_buff* skb) {
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return bpf_traffic_account(skb, BPF_INGRESS);
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}
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SEC("cgroupskb/egress/stats")
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int bpf_cgroup_egress(struct __sk_buff* skb) {
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return bpf_traffic_account(skb, BPF_EGRESS);
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}
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SEC("skfilter/egress/xtbpf")
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int xt_bpf_egress_prog(struct __sk_buff* skb) {
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uint32_t key = skb->ifindex;
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update_iface_stats_map(skb, BPF_EGRESS, &key);
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return BPF_MATCH;
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}
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SEC("skfilter/ingress/xtbpf")
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int xt_bpf_ingress_prog(struct __sk_buff* skb) {
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uint32_t key = skb->ifindex;
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update_iface_stats_map(skb, BPF_INGRESS, &key);
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return BPF_MATCH;
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}
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SEC("skfilter/whitelist/xtbpf")
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int xt_bpf_whitelist_prog(struct __sk_buff* skb) {
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uint32_t sock_uid = bpf_get_socket_uid(skb);
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if (is_system_uid(sock_uid)) return BPF_MATCH;
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UidOwnerValue* whitelistMatch = bpf_uid_owner_map_lookup_elem(&sock_uid);
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if (whitelistMatch) return whitelistMatch->rule & HAPPY_BOX_MATCH;
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return BPF_NOMATCH;
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}
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SEC("skfilter/blacklist/xtbpf")
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int xt_bpf_blacklist_prog(struct __sk_buff* skb) {
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uint32_t sock_uid = bpf_get_socket_uid(skb);
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UidOwnerValue* blacklistMatch = bpf_uid_owner_map_lookup_elem(&sock_uid);
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if (blacklistMatch) return blacklistMatch->rule & PENALTY_BOX_MATCH;
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return BPF_NOMATCH;
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}
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DEFINE_BPF_MAP(uid_permission_map, HASH, uint32_t, uint8_t, UID_OWNER_MAP_SIZE)
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SEC("cgroupsock/inet/create")
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int inet_socket_create(struct bpf_sock* sk) {
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uint64_t gid_uid = bpf_get_current_uid_gid();
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/*
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* A given app is guaranteed to have the same app ID in all the profiles in
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* which it is installed, and install permission is granted to app for all
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* user at install time so we only check the appId part of a request uid at
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* run time. See UserHandle#isSameApp for detail.
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*/
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uint32_t appId = (gid_uid & 0xffffffff) % PER_USER_RANGE;
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uint8_t* permissions = bpf_uid_permission_map_lookup_elem(&appId);
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if (!permissions) {
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// UID not in map. Default to just INTERNET permission.
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return 1;
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}
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// A return value of 1 means allow, everything else means deny.
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return (*permissions & BPF_PERMISSION_INTERNET) == BPF_PERMISSION_INTERNET;
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}
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char _license[] SEC("license") = "Apache 2.0";
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