1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3 #include <network_helpers.h>
5 #include "empty_skb.skel.h"
7 void test_empty_skb(void)
9 LIBBPF_OPTS(bpf_test_run_opts, tattr);
10 struct empty_skb *bpf_obj = NULL;
11 struct nstoken *tok = NULL;
12 struct bpf_program *prog;
27 int lwt_egress_ret; /* expected retval at lwt/egress */
30 /* Empty packets are always rejected. */
33 /* BPF_PROG_RUN ETH_HLEN size check */
34 .msg = "veth empty ingress packet",
37 .ifindex = &veth_ifindex,
41 /* BPF_PROG_RUN ETH_HLEN size check */
42 .msg = "ipip empty ingress packet",
45 .ifindex = &ipip_ifindex,
49 /* ETH_HLEN-sized packets:
50 * - can not be redirected at LWT_XMIT
51 * - can be redirected at TC to non-tunneling dest
55 /* __bpf_redirect_common */
56 .msg = "veth ETH_HLEN packet ingress",
58 .data_size_in = sizeof(eth_hlen),
59 .ifindex = &veth_ifindex,
61 .lwt_egress_ret = -ERANGE,
62 .success_on_tc = true,
65 /* __bpf_redirect_no_mac
67 * lwt: skb->len=0 <= skb_network_offset=0
68 * tc: skb->len=14 <= skb_network_offset=14
70 .msg = "ipip ETH_HLEN packet ingress",
72 .data_size_in = sizeof(eth_hlen),
73 .ifindex = &ipip_ifindex,
75 .lwt_egress_ret = -ERANGE,
78 /* ETH_HLEN+1-sized packet should be redirected. */
81 .msg = "veth ETH_HLEN+1 packet ingress",
82 .data_in = eth_hlen_pp,
83 .data_size_in = sizeof(eth_hlen_pp),
84 .ifindex = &veth_ifindex,
85 .lwt_egress_ret = 1, /* veth_xmit NET_XMIT_DROP */
88 .msg = "ipip ETH_HLEN+1 packet ingress",
89 .data_in = eth_hlen_pp,
90 .data_size_in = sizeof(eth_hlen_pp),
91 .ifindex = &ipip_ifindex,
95 SYS(out, "ip netns add empty_skb");
96 tok = open_netns("empty_skb");
97 SYS(out, "ip link add veth0 type veth peer veth1");
98 SYS(out, "ip link set dev veth0 up");
99 SYS(out, "ip link set dev veth1 up");
100 SYS(out, "ip addr add 10.0.0.1/8 dev veth0");
101 SYS(out, "ip addr add 10.0.0.2/8 dev veth1");
102 veth_ifindex = if_nametoindex("veth0");
104 SYS(out, "ip link add ipip0 type ipip local 10.0.0.1 remote 10.0.0.2");
105 SYS(out, "ip link set ipip0 up");
106 SYS(out, "ip addr add 192.168.1.1/16 dev ipip0");
107 ipip_ifindex = if_nametoindex("ipip0");
109 bpf_obj = empty_skb__open_and_load();
110 if (!ASSERT_OK_PTR(bpf_obj, "open skeleton"))
113 for (i = 0; i < ARRAY_SIZE(tests); i++) {
114 bpf_object__for_each_program(prog, bpf_obj->obj) {
115 bool at_egress = strstr(bpf_program__name(prog), "egress") != NULL;
116 bool at_tc = !strncmp(bpf_program__section_name(prog), "tc", 2);
120 expected_ret = at_egress && !at_tc ? tests[i].lwt_egress_ret : tests[i].ret;
122 tattr.data_in = tests[i].data_in;
123 tattr.data_size_in = tests[i].data_size_in;
125 tattr.data_size_out = 0;
126 bpf_obj->bss->ifindex = *tests[i].ifindex;
127 bpf_obj->bss->ret = 0;
128 err = bpf_prog_test_run_opts(bpf_program__fd(prog), &tattr);
129 sprintf(buf, "err: %s [%s]", tests[i].msg, bpf_program__name(prog));
131 if (at_tc && tests[i].success_on_tc)
132 ASSERT_GE(err, 0, buf);
134 ASSERT_EQ(err, tests[i].err, buf);
135 sprintf(buf, "ret: %s [%s]", tests[i].msg, bpf_program__name(prog));
136 if (at_tc && tests[i].success_on_tc)
137 ASSERT_GE(bpf_obj->bss->ret, 0, buf);
139 ASSERT_EQ(bpf_obj->bss->ret, expected_ret, buf);
145 empty_skb__destroy(bpf_obj);
148 SYS_NOFAIL("ip netns del empty_skb");