// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include "bpf_tracing_net.h"
#include <bpf/bpf_core_read.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "bpf_misc.h"
extern unsigned long CONFIG_HZ __kconfig;
const volatile char veth[IFNAMSIZ];
const volatile int veth_ifindex;
int nr_listen;
int nr_passive;
int nr_active;
int nr_connect;
int nr_binddev;
int nr_socket_post_create;
int nr_fin_wait1;
struct sockopt_test {
int opt;
int new;
int restore;
int expected;
int tcp_expected;
unsigned int flip:1;
};
static const char not_exist_cc[] = "not_exist";
static const char cubic_cc[] = "cubic";
static const char reno_cc[] = "reno";
static const struct sockopt_test sol_socket_tests[] = {
{ .opt = SO_REUSEADDR, .flip = 1, },
{ .opt = SO_SNDBUF, .new = 8123, .expected = 8123 * 2, },
{ .opt = SO_RCVBUF, .new = 8123, .expected = 8123 * 2, },
{ .opt = SO_KEEPALIVE, .flip = 1, },
{ .opt = SO_PRIORITY, .new = 0xeb9f, .expected = 0xeb9f, },
{ .opt = SO_REUSEPORT, .flip = 1, },
{ .opt = SO_RCVLOWAT, .new = 8123, .expected = 8123, },
{ .opt = SO_MARK, .new = 0xeb9f, .expected = 0xeb9f, },
{ .opt = SO_MAX_PACING_RATE, .new = 0xeb9f, .expected = 0xeb9f, },
{ .opt = SO_TXREHASH, .flip = 1, },
{ .opt = 0, },
};
static const struct sockopt_test sol_tcp_tests[] = {
{ .opt = TCP_NODELAY, .flip = 1, },
{ .opt = TCP_KEEPIDLE, .new = 123, .expected = 123, .restore = 321, },
{ .opt = TCP_KEEPINTVL, .new = 123, .expected = 123, .restore = 321, },
{ .opt = TCP_KEEPCNT, .new = 123, .expected = 123, .restore = 124, },
{ .opt = TCP_SYNCNT, .new = 123, .expected = 123, .restore = 124, },
{ .opt = TCP_WINDOW_CLAMP, .new = 8123, .expected = 8123, .restore = 8124, },
{ .opt = TCP_CONGESTION, },
{ .opt = TCP_THIN_LINEAR_TIMEOUTS, .flip = 1, },
{ .opt = TCP_USER_TIMEOUT, .new = 123400, .expected = 123400, },
{ .opt = TCP_NOTSENT_LOWAT, .new = 1314, .expected = 1314, },
{ .opt = TCP_BPF_SOCK_OPS_CB_FLAGS, .new = BPF_SOCK_OPS_ALL_CB_FLAGS,
.expected = BPF_SOCK_OPS_ALL_CB_FLAGS, },
{ .opt = 0, },
};
static const struct sockopt_test sol_ip_tests[] = {
{ .opt = IP_TOS, .new = 0xe1, .expected = 0xe1, .tcp_expected = 0xe0, },
{ .opt = 0, },
};
static const struct sockopt_test sol_ipv6_tests[] = {
{ .opt = IPV6_TCLASS, .new = 0xe1, .expected = 0xe1, .tcp_expected = 0xe0, },
{ .opt = IPV6_AUTOFLOWLABEL, .flip = 1, },
{ .opt = 0, },
};
struct loop_ctx {
void *ctx;
struct sock *sk;
};
static int bpf_test_sockopt_flip(void *ctx, struct sock *sk,
const struct sockopt_test *t,
int level)
{
int old, tmp, new, opt = t->opt;
opt = t->opt;
if (bpf_getsockopt(ctx, level, opt, &old, sizeof(old)))
return 1;
/* kernel initialized txrehash to 255 */
if (level == SOL_SOCKET && opt == SO_TXREHASH && old != 0 && old != 1)
old = 1;
new = !old;
if (bpf_setsockopt(ctx, level, opt, &new, sizeof(new)))
return 1;
if (bpf_getsockopt(ctx, level, opt, &tmp, sizeof(tmp)) ||
tmp != new)
return 1;
if (bpf_setsockopt(ctx, level, opt, &old, sizeof(old)))
return 1;
return 0;
}
static int bpf_test_sockopt_int(void *ctx, struct sock *sk,
const struct sockopt_test *t,
int level)
{
int old, tmp, new, expected, opt;
opt = t->opt;
new = t->new;
if (sk->sk_type == SOCK_STREAM && t->tcp_expected)
expected = t->tcp_expected;
else
expected = t->expected;
if (bpf_getsockopt(ctx, level, opt, &old, sizeof(old)) ||
old == new)
return 1;
if (bpf_setsockopt(ctx, level, opt, &new, sizeof(new)))
return 1;
if (bpf_getsockopt(ctx, level, opt, &tmp, sizeof(tmp)) ||
tmp != expected)
return 1;
if (t->restore)
old = t->restore;
if (bpf_setsockopt(ctx, level, opt, &old, sizeof(old)))
return 1;
return 0;
}
static int bpf_test_socket_sockopt(__u32 i, struct loop_ctx *lc)
{
const struct sockopt_test *t;
if (i >= ARRAY_SIZE(sol_socket_tests))
return 1;
t = &sol_socket_tests[i];
if (!t->opt)
return 1;
if (t->flip)
return bpf_test_sockopt_flip(lc->ctx, lc->sk, t, SOL_SOCKET);
return bpf_test_sockopt_int(lc->ctx, lc->sk, t, SOL_SOCKET);
}
static int bpf_test_ip_sockopt(__u32 i, struct loop_ctx *lc)
{
const struct sockopt_test *t;
if (i >= ARRAY_SIZE(sol_ip_tests))
return 1;
t = &sol_ip_tests[i];
if (!t->opt)
return 1;
if (t->flip)
return bpf_test_sockopt_flip(lc->ctx, lc->sk, t, IPPROTO_IP);
return bpf_test_sockopt_int(lc->ctx, lc->sk, t, IPPROTO_IP);
}
static int bpf_test_ipv6_sockopt(__u32 i, struct loop_ctx *lc)
{
const struct sockopt_test *t;
if (i >= ARRAY_SIZE(sol_ipv6_tests))
return 1;
t = &sol_ipv6_tests[i];
if (!t->opt)
return 1;
if (t->flip)
return bpf_test_sockopt_flip(lc->ctx, lc->sk, t, IPPROTO_IPV6);
return bpf_test_sockopt_int(lc->ctx, lc->sk, t, IPPROTO_IPV6);
}
static int bpf_test_tcp_sockopt(__u32 i, struct loop_ctx *lc)
{
const struct sockopt_test *t;
struct sock *sk;
void *ctx;
if (i >= ARRAY_SIZE(sol_tcp_tests))
return 1;
t = &sol_tcp_tests[i];
if (!t->opt)
return 1;
ctx = lc->ctx;
sk = lc->sk;
if (t->opt == TCP_CONGESTION) {
char old_cc[16], tmp_cc[16];
const char *new_cc;
int new_cc_len;
if (!bpf_setsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION,
(void *)not_exist_cc, sizeof(not_exist_cc)))
return 1;
if (bpf_getsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, old_cc, sizeof(old_cc)))
return 1;
if (!bpf_strncmp(old_cc, sizeof(old_cc), cubic_cc)) {
new_cc = reno_cc;
new_cc_len = sizeof(reno_cc);
} else {
new_cc = cubic_cc;
new_cc_len = sizeof(cubic_cc);
}
if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, (void *)new_cc,
new_cc_len))
return 1;
if (bpf_getsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, tmp_cc, sizeof(tmp_cc)))
return 1;
if (bpf_strncmp(tmp_cc, sizeof(tmp_cc), new_cc))
return 1;
if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, old_cc, sizeof(old_cc)))
return 1;
return 0;
}
if (t->flip)
return bpf_test_sockopt_flip(ctx, sk, t, IPPROTO_TCP);
return bpf_test_sockopt_int(ctx, sk, t, IPPROTO_TCP);
}
static int bpf_test_sockopt(void *ctx, struct sock *sk)
{
struct loop_ctx lc = { .ctx = ctx, .sk = sk, };
__u16 family, proto;
int n;
family = sk->sk_family;
proto = sk->sk_protocol;
n = bpf_loop(ARRAY_SIZE(sol_socket_tests), bpf_test_socket_sockopt, &lc, 0);
if (n != ARRAY_SIZE(sol_socket_tests))
return -1;
if (proto == IPPROTO_TCP) {
n = bpf_loop(ARRAY_SIZE(sol_tcp_tests), bpf_test_tcp_sockopt, &lc, 0);
if (n != ARRAY_SIZE(sol_tcp_tests))
return -1;
}
if (family == AF_INET) {
n = bpf_loop(ARRAY_SIZE(sol_ip_tests), bpf_test_ip_sockopt, &lc, 0);
if (n != ARRAY_SIZE(sol_ip_tests))
return -1;
} else {
n = bpf_loop(ARRAY_SIZE(sol_ipv6_tests), bpf_test_ipv6_sockopt, &lc, 0);
if (n != ARRAY_SIZE(sol_ipv6_tests))
return -1;
}
return 0;
}
static int binddev_test(void *ctx)
{
const char empty_ifname[] = "";
int ifindex, zero = 0;
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
(void *)veth, sizeof(veth)))
return -1;
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
&ifindex, sizeof(int)) ||
ifindex != veth_ifindex)
return -1;
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTODEVICE,
(void *)empty_ifname, sizeof(empty_ifname)))
return -1;
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
&ifindex, sizeof(int)) ||
ifindex != 0)
return -1;
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
(void *)&veth_ifindex, sizeof(int)))
return -1;
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
&ifindex, sizeof(int)) ||
ifindex != veth_ifindex)
return -1;
if (bpf_setsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
&zero, sizeof(int)))
return -1;
if (bpf_getsockopt(ctx, SOL_SOCKET, SO_BINDTOIFINDEX,
&ifindex, sizeof(int)) ||
ifindex != 0)
return -1;
return 0;
}
static int test_tcp_maxseg(void *ctx, struct sock *sk)
{
int val = 1314, tmp;
if (sk->sk_state != TCP_ESTABLISHED)
return bpf_setsockopt(ctx, IPPROTO_TCP, TCP_MAXSEG,
&val, sizeof(val));
if (bpf_getsockopt(ctx, IPPROTO_TCP, TCP_MAXSEG, &tmp, sizeof(tmp)) ||
tmp > val)
return -1;
return 0;
}
static int test_tcp_saved_syn(void *ctx, struct sock *sk)
{
__u8 saved_syn[20];
int one = 1;
if (sk->sk_state == TCP_LISTEN)
return bpf_setsockopt(ctx, IPPROTO_TCP, TCP_SAVE_SYN,
&one, sizeof(one));
return bpf_getsockopt(ctx, IPPROTO_TCP, TCP_SAVED_SYN,
saved_syn, sizeof(saved_syn));
}
SEC("lsm_cgroup/socket_post_create")
int BPF_PROG(socket_post_create, struct socket *sock, int family,
int type, int protocol, int kern)
{
struct sock *sk = sock->sk;
if (!sk)
return 1;
nr_socket_post_create += !bpf_test_sockopt(sk, sk);
nr_binddev += !binddev_test(sk);
return 1;
}
SEC("cgroup/getsockopt")
int _getsockopt(struct bpf_sockopt *ctx)
{
struct bpf_sock *sk = ctx->sk;
int *optval = ctx->optval;
struct tcp_sock *tp;
if (!sk || ctx->level != SOL_TCP || ctx->optname != TCP_BPF_SOCK_OPS_CB_FLAGS)
return 1;
tp = bpf_core_cast(sk, struct tcp_sock);
if (ctx->optval + sizeof(int) <= ctx->optval_end) {
*optval = tp->bpf_sock_ops_cb_flags;
ctx->retval = 0;
}
return 1;
}
SEC("sockops")
int skops_sockopt(struct bpf_sock_ops *skops)
{
struct bpf_sock *bpf_sk = skops->sk;
struct sock *sk;
int flags;
if (!bpf_sk)
return 1;
sk = (struct sock *)bpf_skc_to_tcp_sock(bpf_sk);
if (!sk)
return 1;
switch (skops->op) {
case BPF_SOCK_OPS_TCP_LISTEN_CB:
nr_listen += !(bpf_test_sockopt(skops, sk) ||
test_tcp_maxseg(skops, sk) ||
test_tcp_saved_syn(skops, sk));
break;
case BPF_SOCK_OPS_TCP_CONNECT_CB:
nr_connect += !(bpf_test_sockopt(skops, sk) ||
test_tcp_maxseg(skops, sk));
break;
case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
nr_active += !(bpf_test_sockopt(skops, sk) ||
test_tcp_maxseg(skops, sk));
break;
case BPF_SOCK_OPS_PASSIVE_ESTABLISHED_CB:
nr_passive += !(bpf_test_sockopt(skops, sk) ||
test_tcp_maxseg(skops, sk) ||
test_tcp_saved_syn(skops, sk));
flags = skops->bpf_sock_ops_cb_flags | BPF_SOCK_OPS_STATE_CB_FLAG;
bpf_setsockopt(skops, SOL_TCP, TCP_BPF_SOCK_OPS_CB_FLAGS, &flags, sizeof(flags));
break;
case BPF_SOCK_OPS_STATE_CB:
if (skops->args[1] == BPF_TCP_CLOSE_WAIT)
nr_fin_wait1 += !bpf_test_sockopt(skops, sk);
break;
}
return 1;
}
char _license[] SEC("license") = "GPL";
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