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/* 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;
}
char _license[] SEC("license") = "GPL";
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