Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2017-2018 Covalent IO, Inc. http://covalent.io */
#include <stddef.h>
#include <string.h>
#include <linux/bpf.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/udp.h>
#include <linux/tcp.h>
#include <linux/pkt_cls.h>
#include <sys/socket.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
 
/* Sockmap sample program connects a client and a backend together
 * using cgroups.
 *
 *    client:X <---> frontend:80 client:X <---> backend:80
 *
 * For simplicity we hard code values here and bind 1:1. The hard
 * coded values are part of the setup in sockmap.sh script that
 * is associated with this BPF program.
 *
 * The bpf_printk is verbose and prints information as connections
 * are established and verdicts are decided.
 */
 
struct {
<------>__uint(type, TEST_MAP_TYPE);
<------>__uint(max_entries, 20);
<------>__uint(key_size, sizeof(int));
<------>__uint(value_size, sizeof(int));
} sock_map SEC(".maps");
 
struct {
<------>__uint(type, TEST_MAP_TYPE);
<------>__uint(max_entries, 20);
<------>__uint(key_size, sizeof(int));
<------>__uint(value_size, sizeof(int));
} sock_map_txmsg SEC(".maps");
 
struct {
<------>__uint(type, TEST_MAP_TYPE);
<------>__uint(max_entries, 20);
<------>__uint(key_size, sizeof(int));
<------>__uint(value_size, sizeof(int));
} sock_map_redir SEC(".maps");
 
struct {
<------>__uint(type, BPF_MAP_TYPE_ARRAY);
<------>__uint(max_entries, 1);
<------>__type(key, int);
<------>__type(value, int);
} sock_apply_bytes SEC(".maps");
 
struct {
<------>__uint(type, BPF_MAP_TYPE_ARRAY);
<------>__uint(max_entries, 1);
<------>__type(key, int);
<------>__type(value, int);
} sock_cork_bytes SEC(".maps");
 
struct {
<------>__uint(type, BPF_MAP_TYPE_ARRAY);
<------>__uint(max_entries, 6);
<------>__type(key, int);
<------>__type(value, int);
} sock_bytes SEC(".maps");
 
struct {
<------>__uint(type, BPF_MAP_TYPE_ARRAY);
<------>__uint(max_entries, 1);
<------>__type(key, int);
<------>__type(value, int);
} sock_redir_flags SEC(".maps");
 
struct {
<------>__uint(type, BPF_MAP_TYPE_ARRAY);
<------>__uint(max_entries, 3);
<------>__type(key, int);
<------>__type(value, int);
} sock_skb_opts SEC(".maps");
 
struct {
<------>__uint(type, TEST_MAP_TYPE);
<------>__uint(max_entries, 20);
<------>__uint(key_size, sizeof(int));
<------>__uint(value_size, sizeof(int));
} tls_sock_map SEC(".maps");
 
SEC("sk_skb1")
int bpf_prog1(struct __sk_buff *skb)
{
<------>int *f, two = 2;
 
<------>f = bpf_map_lookup_elem(&sock_skb_opts, &two);
<------>if (f && *f) {
<------><------>return *f;
<------>}
<------>return skb->len;
}
 
SEC("sk_skb2")
int bpf_prog2(struct __sk_buff *skb)
{
<------>__u32 lport = skb->local_port;
<------>__u32 rport = skb->remote_port;
<------>int len, *f, ret, zero = 0;
<------>__u64 flags = 0;
 
<------>if (lport == 10000)
<------><------>ret = 10;
<------>else
<------><------>ret = 1;
 
<------>len = (__u32)skb->data_end - (__u32)skb->data;
<------>f = bpf_map_lookup_elem(&sock_skb_opts, &zero);
<------>if (f && *f) {
<------><------>ret = 3;
<------><------>flags = *f;
<------>}
 
#ifdef SOCKMAP
<------>return bpf_sk_redirect_map(skb, &sock_map, ret, flags);
#else
<------>return bpf_sk_redirect_hash(skb, &sock_map, &ret, flags);
#endif
 
}
 
static inline void bpf_write_pass(struct __sk_buff *skb, int offset)
{
<------>int err = bpf_skb_pull_data(skb, 6 + offset);
<------>void *data_end;
<------>char *c;
 
<------>if (err)
<------><------>return;
 
<------>c = (char *)(long)skb->data;
<------>data_end = (void *)(long)skb->data_end;
 
<------>if (c + 5 + offset < data_end)
<------><------>memcpy(c + offset, "PASS", 4);
}
 
SEC("sk_skb3")
int bpf_prog3(struct __sk_buff *skb)
{
<------>int err, *f, ret = SK_PASS;
<------>const int one = 1;
 
<------>f = bpf_map_lookup_elem(&sock_skb_opts, &one);
<------>if (f && *f) {
<------><------>__u64 flags = 0;
 
<------><------>ret = 0;
<------><------>flags = *f;
 
<------><------>err = bpf_skb_adjust_room(skb, -13, 0, 0);
<------><------>if (err)
<------><------><------>return SK_DROP;
<------><------>err = bpf_skb_adjust_room(skb, 4, 0, 0);
<------><------>if (err)
<------><------><------>return SK_DROP;
<------><------>bpf_write_pass(skb, 0);
#ifdef SOCKMAP
<------><------>return bpf_sk_redirect_map(skb, &tls_sock_map, ret, flags);
#else
<------><------>return bpf_sk_redirect_hash(skb, &tls_sock_map, &ret, flags);
#endif
<------>}
<------>f = bpf_map_lookup_elem(&sock_skb_opts, &one);
<------>if (f && *f)
<------><------>ret = SK_DROP;
<------>err = bpf_skb_adjust_room(skb, 4, 0, 0);
<------>if (err)
<------><------>return SK_DROP;
<------>bpf_write_pass(skb, 13);
tls_out:
<------>return ret;
}
 
SEC("sockops")
int bpf_sockmap(struct bpf_sock_ops *skops)
{
<------>__u32 lport, rport;
<------>int op, err = 0, index, key, ret;
 
 
<------>op = (int) skops->op;
 
<------>switch (op) {
<------>case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
<------><------>lport = skops->local_port;
<------><------>rport = skops->remote_port;
 
<------><------>if (lport == 10000) {
<------><------><------>ret = 1;
#ifdef SOCKMAP
<------><------><------>err = bpf_sock_map_update(skops, &sock_map, &ret,
<------><------><------><------><------><------>  BPF_NOEXIST);
#else
<------><------><------>err = bpf_sock_hash_update(skops, &sock_map, &ret,
<------><------><------><------><------><------>   BPF_NOEXIST);
#endif
<------><------>}
<------><------>break;
<------>case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
<------><------>lport = skops->local_port;
<------><------>rport = skops->remote_port;
 
<------><------>if (bpf_ntohl(rport) == 10001) {
<------><------><------>ret = 10;
#ifdef SOCKMAP
<------><------><------>err = bpf_sock_map_update(skops, &sock_map, &ret,
<------><------><------><------><------><------>  BPF_NOEXIST);
#else
<------><------><------>err = bpf_sock_hash_update(skops, &sock_map, &ret,
<------><------><------><------><------><------>   BPF_NOEXIST);
#endif
<------><------>}
<------><------>break;
<------>default:
<------><------>break;
<------>}
 
<------>return 0;
}
 
SEC("sk_msg1")
int bpf_prog4(struct sk_msg_md *msg)
{
<------>int *bytes, zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5;
<------>int *start, *end, *start_push, *end_push, *start_pop, *pop, err = 0;
 
<------>bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
<------>if (bytes)
<------><------>bpf_msg_apply_bytes(msg, *bytes);
<------>bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
<------>if (bytes)
<------><------>bpf_msg_cork_bytes(msg, *bytes);
<------>start = bpf_map_lookup_elem(&sock_bytes, &zero);
<------>end = bpf_map_lookup_elem(&sock_bytes, &one);
<------>if (start && end)
<------><------>bpf_msg_pull_data(msg, *start, *end, 0);
<------>start_push = bpf_map_lookup_elem(&sock_bytes, &two);
<------>end_push = bpf_map_lookup_elem(&sock_bytes, &three);
<------>if (start_push && end_push) {
<------><------>err = bpf_msg_push_data(msg, *start_push, *end_push, 0);
<------><------>if (err)
<------><------><------>return SK_DROP;
<------>}
<------>start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
<------>pop = bpf_map_lookup_elem(&sock_bytes, &five);
<------>if (start_pop && pop)
<------><------>bpf_msg_pop_data(msg, *start_pop, *pop, 0);
<------>return SK_PASS;
}
 
SEC("sk_msg2")
int bpf_prog6(struct sk_msg_md *msg)
{
<------>int zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5, key = 0;
<------>int *bytes, *start, *end, *start_push, *end_push, *start_pop, *pop, *f;
<------>int err = 0;
<------>__u64 flags = 0;
 
<------>bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
<------>if (bytes)
<------><------>bpf_msg_apply_bytes(msg, *bytes);
<------>bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
<------>if (bytes)
<------><------>bpf_msg_cork_bytes(msg, *bytes);
 
<------>start = bpf_map_lookup_elem(&sock_bytes, &zero);
<------>end = bpf_map_lookup_elem(&sock_bytes, &one);
<------>if (start && end)
<------><------>bpf_msg_pull_data(msg, *start, *end, 0);
 
<------>start_push = bpf_map_lookup_elem(&sock_bytes, &two);
<------>end_push = bpf_map_lookup_elem(&sock_bytes, &three);
<------>if (start_push && end_push) {
<------><------>err = bpf_msg_push_data(msg, *start_push, *end_push, 0);
<------><------>if (err)
<------><------><------>return SK_DROP;
<------>}
 
<------>start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
<------>pop = bpf_map_lookup_elem(&sock_bytes, &five);
<------>if (start_pop && pop)
<------><------>bpf_msg_pop_data(msg, *start_pop, *pop, 0);
 
<------>f = bpf_map_lookup_elem(&sock_redir_flags, &zero);
<------>if (f && *f) {
<------><------>key = 2;
<------><------>flags = *f;
<------>}
#ifdef SOCKMAP
<------>return bpf_msg_redirect_map(msg, &sock_map_redir, key, flags);
#else
<------>return bpf_msg_redirect_hash(msg, &sock_map_redir, &key, flags);
#endif
}
 
SEC("sk_msg3")
int bpf_prog8(struct sk_msg_md *msg)
{
<------>void *data_end = (void *)(long) msg->data_end;
<------>void *data = (void *)(long) msg->data;
<------>int ret = 0, *bytes, zero = 0;
 
<------>bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
<------>if (bytes) {
<------><------>ret = bpf_msg_apply_bytes(msg, *bytes);
<------><------>if (ret)
<------><------><------>return SK_DROP;
<------>} else {
<------><------>return SK_DROP;
<------>}
<------>return SK_PASS;
}
SEC("sk_msg4")
int bpf_prog9(struct sk_msg_md *msg)
{
<------>void *data_end = (void *)(long) msg->data_end;
<------>void *data = (void *)(long) msg->data;
<------>int ret = 0, *bytes, zero = 0;
 
<------>bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
<------>if (bytes) {
<------><------>if (((__u64)data_end - (__u64)data) >= *bytes)
<------><------><------>return SK_PASS;
<------><------>ret = bpf_msg_cork_bytes(msg, *bytes);
<------><------>if (ret)
<------><------><------>return SK_DROP;
<------>}
<------>return SK_PASS;
}
 
SEC("sk_msg5")
int bpf_prog10(struct sk_msg_md *msg)
{
<------>int *bytes, *start, *end, *start_push, *end_push, *start_pop, *pop;
<------>int zero = 0, one = 1, two = 2, three = 3, four = 4, five = 5, err = 0;
 
<------>bytes = bpf_map_lookup_elem(&sock_apply_bytes, &zero);
<------>if (bytes)
<------><------>bpf_msg_apply_bytes(msg, *bytes);
<------>bytes = bpf_map_lookup_elem(&sock_cork_bytes, &zero);
<------>if (bytes)
<------><------>bpf_msg_cork_bytes(msg, *bytes);
<------>start = bpf_map_lookup_elem(&sock_bytes, &zero);
<------>end = bpf_map_lookup_elem(&sock_bytes, &one);
<------>if (start && end)
<------><------>bpf_msg_pull_data(msg, *start, *end, 0);
<------>start_push = bpf_map_lookup_elem(&sock_bytes, &two);
<------>end_push = bpf_map_lookup_elem(&sock_bytes, &three);
<------>if (start_push && end_push) {
<------><------>err = bpf_msg_push_data(msg, *start_push, *end_push, 0);
<------><------>if (err)
<------><------><------>return SK_PASS;
<------>}
<------>start_pop = bpf_map_lookup_elem(&sock_bytes, &four);
<------>pop = bpf_map_lookup_elem(&sock_bytes, &five);
<------>if (start_pop && pop)
<------><------>bpf_msg_pop_data(msg, *start_pop, *pop, 0);
<------>return SK_DROP;
}
 
int _version SEC("version") = 1;
char _license[] SEC("license") = "GPL";