bb57fa9eec
The folder is currently used by tether offload only. Because we will move netd.c and clatd.c to it, the folder should be moved to the upper tier. Also, rename bpf_tethering_headers to bpf_connectivity_headers so that other connectivity code besides to tethering are justified to use it. Bug: 202086915 Test: atest FrameworksNetTests Change-Id: I95943c6e909f1fdca12604ef0c55d67c39ca686b
73 lines
3.4 KiB
C
73 lines
3.4 KiB
C
/*
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* Copyright (C) 2019 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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#pragma once
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#include <linux/bpf.h>
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#include <linux/if_packet.h>
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#include <stdbool.h>
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#include <stdint.h>
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// this returns 0 iff skb->sk is NULL
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static uint64_t (*bpf_get_socket_cookie)(struct __sk_buff* skb) = (void*)BPF_FUNC_get_socket_cookie;
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static uint32_t (*bpf_get_socket_uid)(struct __sk_buff* skb) = (void*)BPF_FUNC_get_socket_uid;
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static int (*bpf_skb_pull_data)(struct __sk_buff* skb, __u32 len) = (void*)BPF_FUNC_skb_pull_data;
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static int (*bpf_skb_load_bytes)(struct __sk_buff* skb, int off, void* to,
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int len) = (void*)BPF_FUNC_skb_load_bytes;
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static int (*bpf_skb_store_bytes)(struct __sk_buff* skb, __u32 offset, const void* from, __u32 len,
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__u64 flags) = (void*)BPF_FUNC_skb_store_bytes;
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static int64_t (*bpf_csum_diff)(__be32* from, __u32 from_size, __be32* to, __u32 to_size,
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__wsum seed) = (void*)BPF_FUNC_csum_diff;
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static int64_t (*bpf_csum_update)(struct __sk_buff* skb, __wsum csum) = (void*)BPF_FUNC_csum_update;
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static int (*bpf_skb_change_proto)(struct __sk_buff* skb, __be16 proto,
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__u64 flags) = (void*)BPF_FUNC_skb_change_proto;
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static int (*bpf_l3_csum_replace)(struct __sk_buff* skb, __u32 offset, __u64 from, __u64 to,
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__u64 flags) = (void*)BPF_FUNC_l3_csum_replace;
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static int (*bpf_l4_csum_replace)(struct __sk_buff* skb, __u32 offset, __u64 from, __u64 to,
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__u64 flags) = (void*)BPF_FUNC_l4_csum_replace;
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static int (*bpf_redirect)(__u32 ifindex, __u64 flags) = (void*)BPF_FUNC_redirect;
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static int (*bpf_redirect_map)(const struct bpf_map_def* map, __u32 key,
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__u64 flags) = (void*)BPF_FUNC_redirect_map;
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static int (*bpf_skb_change_head)(struct __sk_buff* skb, __u32 head_room,
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__u64 flags) = (void*)BPF_FUNC_skb_change_head;
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static int (*bpf_skb_adjust_room)(struct __sk_buff* skb, __s32 len_diff, __u32 mode,
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__u64 flags) = (void*)BPF_FUNC_skb_adjust_room;
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// Android only supports little endian architectures
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#define htons(x) (__builtin_constant_p(x) ? ___constant_swab16(x) : __builtin_bswap16(x))
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#define htonl(x) (__builtin_constant_p(x) ? ___constant_swab32(x) : __builtin_bswap32(x))
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#define ntohs(x) htons(x)
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#define ntohl(x) htonl(x)
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static inline __always_inline __unused bool is_received_skb(struct __sk_buff* skb) {
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return skb->pkt_type == PACKET_HOST || skb->pkt_type == PACKET_BROADCAST ||
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skb->pkt_type == PACKET_MULTICAST;
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}
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// try to make the first 'len' header bytes readable via direct packet access
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static inline __always_inline void try_make_readable(struct __sk_buff* skb, int len) {
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if (len > skb->len) len = skb->len;
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if (skb->data_end - skb->data < len) bpf_skb_pull_data(skb, len);
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}
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