xref: /linux/tools/testing/selftests/bpf/progs/verifier_cgroup_skb.c (revision b1b63725)

// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/cgroup_skb.c */

#include <linux/bpf.h>
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"

SEC("cgroup/skb")
__description("direct packet read test#1 for CGROUP_SKB")
__success __failure_unpriv
__msg_unpriv("invalid bpf_context access off=76 size=4")
__retval(0)
__naked void test_1_for_cgroup_skb(void)
{
	asm volatile ("					\
	r2 = *(u32*)(r1 + %[__sk_buff_data]);		\
	r3 = *(u32*)(r1 + %[__sk_buff_data_end]);	\
	r4 = *(u32*)(r1 + %[__sk_buff_len]);		\
	r5 = *(u32*)(r1 + %[__sk_buff_pkt_type]);	\
	r6 = *(u32*)(r1 + %[__sk_buff_mark]);		\
	*(u32*)(r1 + %[__sk_buff_mark]) = r6;		\
	r7 = *(u32*)(r1 + %[__sk_buff_queue_mapping]);	\
	r8 = *(u32*)(r1 + %[__sk_buff_protocol]);	\
	r9 = *(u32*)(r1 + %[__sk_buff_vlan_present]);	\
	r0 = r2;					\
	r0 += 8;					\
	if r0 > r3 goto l0_%=;				\
	r0 = *(u8*)(r2 + 0);				\
l0_%=:	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_data, offsetof(struct __sk_buff, data)),
	  __imm_const(__sk_buff_data_end, offsetof(struct __sk_buff, data_end)),
	  __imm_const(__sk_buff_len, offsetof(struct __sk_buff, len)),
	  __imm_const(__sk_buff_mark, offsetof(struct __sk_buff, mark)),
	  __imm_const(__sk_buff_pkt_type, offsetof(struct __sk_buff, pkt_type)),
	  __imm_const(__sk_buff_protocol, offsetof(struct __sk_buff, protocol)),
	  __imm_const(__sk_buff_queue_mapping, offsetof(struct __sk_buff, queue_mapping)),
	  __imm_const(__sk_buff_vlan_present, offsetof(struct __sk_buff, vlan_present))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("direct packet read test#2 for CGROUP_SKB")
__success __success_unpriv __retval(0)
__naked void test_2_for_cgroup_skb(void)
{
	asm volatile ("					\
	r4 = *(u32*)(r1 + %[__sk_buff_vlan_tci]);	\
	r5 = *(u32*)(r1 + %[__sk_buff_vlan_proto]);	\
	r6 = *(u32*)(r1 + %[__sk_buff_priority]);	\
	*(u32*)(r1 + %[__sk_buff_priority]) = r6;	\
	r7 = *(u32*)(r1 + %[__sk_buff_ingress_ifindex]);\
	r8 = *(u32*)(r1 + %[__sk_buff_tc_index]);	\
	r9 = *(u32*)(r1 + %[__sk_buff_hash]);		\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_hash, offsetof(struct __sk_buff, hash)),
	  __imm_const(__sk_buff_ingress_ifindex, offsetof(struct __sk_buff, ingress_ifindex)),
	  __imm_const(__sk_buff_priority, offsetof(struct __sk_buff, priority)),
	  __imm_const(__sk_buff_tc_index, offsetof(struct __sk_buff, tc_index)),
	  __imm_const(__sk_buff_vlan_proto, offsetof(struct __sk_buff, vlan_proto)),
	  __imm_const(__sk_buff_vlan_tci, offsetof(struct __sk_buff, vlan_tci))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("direct packet read test#3 for CGROUP_SKB")
__success __success_unpriv __retval(0)
__naked void test_3_for_cgroup_skb(void)
{
	asm volatile ("					\
	r4 = *(u32*)(r1 + %[__sk_buff_cb_0]);		\
	r5 = *(u32*)(r1 + %[__sk_buff_cb_1]);		\
	r6 = *(u32*)(r1 + %[__sk_buff_cb_2]);		\
	r7 = *(u32*)(r1 + %[__sk_buff_cb_3]);		\
	r8 = *(u32*)(r1 + %[__sk_buff_cb_4]);		\
	r9 = *(u32*)(r1 + %[__sk_buff_napi_id]);	\
	*(u32*)(r1 + %[__sk_buff_cb_0]) = r4;		\
	*(u32*)(r1 + %[__sk_buff_cb_1]) = r5;		\
	*(u32*)(r1 + %[__sk_buff_cb_2]) = r6;		\
	*(u32*)(r1 + %[__sk_buff_cb_3]) = r7;		\
	*(u32*)(r1 + %[__sk_buff_cb_4]) = r8;		\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_cb_0, offsetof(struct __sk_buff, cb[0])),
	  __imm_const(__sk_buff_cb_1, offsetof(struct __sk_buff, cb[1])),
	  __imm_const(__sk_buff_cb_2, offsetof(struct __sk_buff, cb[2])),
	  __imm_const(__sk_buff_cb_3, offsetof(struct __sk_buff, cb[3])),
	  __imm_const(__sk_buff_cb_4, offsetof(struct __sk_buff, cb[4])),
	  __imm_const(__sk_buff_napi_id, offsetof(struct __sk_buff, napi_id))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("direct packet read test#4 for CGROUP_SKB")
__success __success_unpriv __retval(0)
__naked void test_4_for_cgroup_skb(void)
{
	asm volatile ("					\
	r2 = *(u32*)(r1 + %[__sk_buff_family]);		\
	r3 = *(u32*)(r1 + %[__sk_buff_remote_ip4]);	\
	r4 = *(u32*)(r1 + %[__sk_buff_local_ip4]);	\
	r5 = *(u32*)(r1 + %[__sk_buff_remote_ip6_0]);	\
	r5 = *(u32*)(r1 + %[__sk_buff_remote_ip6_1]);	\
	r5 = *(u32*)(r1 + %[__sk_buff_remote_ip6_2]);	\
	r5 = *(u32*)(r1 + %[__sk_buff_remote_ip6_3]);	\
	r6 = *(u32*)(r1 + %[__sk_buff_local_ip6_0]);	\
	r6 = *(u32*)(r1 + %[__sk_buff_local_ip6_1]);	\
	r6 = *(u32*)(r1 + %[__sk_buff_local_ip6_2]);	\
	r6 = *(u32*)(r1 + %[__sk_buff_local_ip6_3]);	\
	r7 = *(u32*)(r1 + %[__sk_buff_remote_port]);	\
	r8 = *(u32*)(r1 + %[__sk_buff_local_port]);	\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_family, offsetof(struct __sk_buff, family)),
	  __imm_const(__sk_buff_local_ip4, offsetof(struct __sk_buff, local_ip4)),
	  __imm_const(__sk_buff_local_ip6_0, offsetof(struct __sk_buff, local_ip6[0])),
	  __imm_const(__sk_buff_local_ip6_1, offsetof(struct __sk_buff, local_ip6[1])),
	  __imm_const(__sk_buff_local_ip6_2, offsetof(struct __sk_buff, local_ip6[2])),
	  __imm_const(__sk_buff_local_ip6_3, offsetof(struct __sk_buff, local_ip6[3])),
	  __imm_const(__sk_buff_local_port, offsetof(struct __sk_buff, local_port)),
	  __imm_const(__sk_buff_remote_ip4, offsetof(struct __sk_buff, remote_ip4)),
	  __imm_const(__sk_buff_remote_ip6_0, offsetof(struct __sk_buff, remote_ip6[0])),
	  __imm_const(__sk_buff_remote_ip6_1, offsetof(struct __sk_buff, remote_ip6[1])),
	  __imm_const(__sk_buff_remote_ip6_2, offsetof(struct __sk_buff, remote_ip6[2])),
	  __imm_const(__sk_buff_remote_ip6_3, offsetof(struct __sk_buff, remote_ip6[3])),
	  __imm_const(__sk_buff_remote_port, offsetof(struct __sk_buff, remote_port))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("invalid access of tc_classid for CGROUP_SKB")
__failure __msg("invalid bpf_context access")
__failure_unpriv
__naked void tc_classid_for_cgroup_skb(void)
{
	asm volatile ("					\
	r0 = *(u32*)(r1 + %[__sk_buff_tc_classid]);	\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_tc_classid, offsetof(struct __sk_buff, tc_classid))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("invalid access of data_meta for CGROUP_SKB")
__failure __msg("invalid bpf_context access")
__failure_unpriv
__naked void data_meta_for_cgroup_skb(void)
{
	asm volatile ("					\
	r0 = *(u32*)(r1 + %[__sk_buff_data_meta]);	\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_data_meta, offsetof(struct __sk_buff, data_meta))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("invalid access of flow_keys for CGROUP_SKB")
__failure __msg("invalid bpf_context access")
__failure_unpriv
__naked void flow_keys_for_cgroup_skb(void)
{
	asm volatile ("					\
	r0 = *(u32*)(r1 + %[__sk_buff_flow_keys]);	\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_flow_keys, offsetof(struct __sk_buff, flow_keys))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("invalid write access to napi_id for CGROUP_SKB")
__failure __msg("invalid bpf_context access")
__failure_unpriv
__naked void napi_id_for_cgroup_skb(void)
{
	asm volatile ("					\
	r9 = *(u32*)(r1 + %[__sk_buff_napi_id]);	\
	*(u32*)(r1 + %[__sk_buff_napi_id]) = r9;	\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_napi_id, offsetof(struct __sk_buff, napi_id))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("write tstamp from CGROUP_SKB")
__success __failure_unpriv
__msg_unpriv("invalid bpf_context access off=152 size=8")
__retval(0)
__naked void write_tstamp_from_cgroup_skb(void)
{
	asm volatile ("					\
	r0 = 0;						\
	*(u64*)(r1 + %[__sk_buff_tstamp]) = r0;		\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_tstamp, offsetof(struct __sk_buff, tstamp))
	: __clobber_all);
}

SEC("cgroup/skb")
__description("read tstamp from CGROUP_SKB")
__success __success_unpriv __retval(0)
__naked void read_tstamp_from_cgroup_skb(void)
{
	asm volatile ("					\
	r0 = *(u64*)(r1 + %[__sk_buff_tstamp]);		\
	r0 = 0;						\
	exit;						\
"	:
	: __imm_const(__sk_buff_tstamp, offsetof(struct __sk_buff, tstamp))
	: __clobber_all);
}

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