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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 | // SPDX-License-Identifier: GPL-2.0 /* Copyright (c) 2020 Facebook */ #include <uapi/linux/if_link.h> #include <test_progs.h> #include "test_xdp_link.skel.h" #define IFINDEX_LO 1 void test_xdp_link(void) { __u32 duration = 0, id1, id2, id0 = 0, prog_fd1, prog_fd2, err; DECLARE_LIBBPF_OPTS(bpf_xdp_set_link_opts, opts, .old_fd = -1); struct test_xdp_link *skel1 = NULL, *skel2 = NULL; struct bpf_link_info link_info; struct bpf_prog_info prog_info; struct bpf_link *link; __u32 link_info_len = sizeof(link_info); __u32 prog_info_len = sizeof(prog_info); skel1 = test_xdp_link__open_and_load(); if (CHECK(!skel1, "skel_load", "skeleton open and load failed\n")) goto cleanup; prog_fd1 = bpf_program__fd(skel1->progs.xdp_handler); skel2 = test_xdp_link__open_and_load(); if (CHECK(!skel2, "skel_load", "skeleton open and load failed\n")) goto cleanup; prog_fd2 = bpf_program__fd(skel2->progs.xdp_handler); memset(&prog_info, 0, sizeof(prog_info)); err = bpf_obj_get_info_by_fd(prog_fd1, &prog_info, &prog_info_len); if (CHECK(err, "fd_info1", "failed %d\n", -errno)) goto cleanup; id1 = prog_info.id; memset(&prog_info, 0, sizeof(prog_info)); err = bpf_obj_get_info_by_fd(prog_fd2, &prog_info, &prog_info_len); if (CHECK(err, "fd_info2", "failed %d\n", -errno)) goto cleanup; id2 = prog_info.id; /* set initial prog attachment */ err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, prog_fd1, XDP_FLAGS_REPLACE, &opts); if (CHECK(err, "fd_attach", "initial prog attach failed: %d\n", err)) goto cleanup; /* validate prog ID */ err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0); CHECK(err || id0 != id1, "id1_check", "loaded prog id %u != id1 %u, err %d", id0, id1, err); /* BPF link is not allowed to replace prog attachment */ link = bpf_program__attach_xdp(skel1->progs.xdp_handler, IFINDEX_LO); if (CHECK(!IS_ERR(link), "link_attach_fail", "unexpected success\n")) { bpf_link__destroy(link); /* best-effort detach prog */ opts.old_fd = prog_fd1; bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, XDP_FLAGS_REPLACE, &opts); goto cleanup; } /* detach BPF program */ opts.old_fd = prog_fd1; err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, -1, XDP_FLAGS_REPLACE, &opts); if (CHECK(err, "prog_detach", "failed %d\n", err)) goto cleanup; /* now BPF link should attach successfully */ link = bpf_program__attach_xdp(skel1->progs.xdp_handler, IFINDEX_LO); if (CHECK(IS_ERR(link), "link_attach", "failed: %ld\n", PTR_ERR(link))) goto cleanup; skel1->links.xdp_handler = link; /* validate prog ID */ err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0); if (CHECK(err || id0 != id1, "id1_check", "loaded prog id %u != id1 %u, err %d", id0, id1, err)) goto cleanup; /* BPF prog attach is not allowed to replace BPF link */ opts.old_fd = prog_fd1; err = bpf_set_link_xdp_fd_opts(IFINDEX_LO, prog_fd2, XDP_FLAGS_REPLACE, &opts); if (CHECK(!err, "prog_attach_fail", "unexpected success\n")) goto cleanup; /* Can't force-update when BPF link is active */ err = bpf_set_link_xdp_fd(IFINDEX_LO, prog_fd2, 0); if (CHECK(!err, "prog_update_fail", "unexpected success\n")) goto cleanup; /* Can't force-detach when BPF link is active */ err = bpf_set_link_xdp_fd(IFINDEX_LO, -1, 0); if (CHECK(!err, "prog_detach_fail", "unexpected success\n")) goto cleanup; /* BPF link is not allowed to replace another BPF link */ link = bpf_program__attach_xdp(skel2->progs.xdp_handler, IFINDEX_LO); if (CHECK(!IS_ERR(link), "link_attach_fail", "unexpected success\n")) { bpf_link__destroy(link); goto cleanup; } bpf_link__destroy(skel1->links.xdp_handler); skel1->links.xdp_handler = NULL; /* new link attach should succeed */ link = bpf_program__attach_xdp(skel2->progs.xdp_handler, IFINDEX_LO); if (CHECK(IS_ERR(link), "link_attach", "failed: %ld\n", PTR_ERR(link))) goto cleanup; skel2->links.xdp_handler = link; err = bpf_get_link_xdp_id(IFINDEX_LO, &id0, 0); if (CHECK(err || id0 != id2, "id2_check", "loaded prog id %u != id2 %u, err %d", id0, id1, err)) goto cleanup; /* updating program under active BPF link works as expected */ err = bpf_link__update_program(link, skel1->progs.xdp_handler); if (CHECK(err, "link_upd", "failed: %d\n", err)) goto cleanup; memset(&link_info, 0, sizeof(link_info)); err = bpf_obj_get_info_by_fd(bpf_link__fd(link), &link_info, &link_info_len); if (CHECK(err, "link_info", "failed: %d\n", err)) goto cleanup; CHECK(link_info.type != BPF_LINK_TYPE_XDP, "link_type", "got %u != exp %u\n", link_info.type, BPF_LINK_TYPE_XDP); CHECK(link_info.prog_id != id1, "link_prog_id", "got %u != exp %u\n", link_info.prog_id, id1); CHECK(link_info.xdp.ifindex != IFINDEX_LO, "link_ifindex", "got %u != exp %u\n", link_info.xdp.ifindex, IFINDEX_LO); err = bpf_link__detach(link); if (CHECK(err, "link_detach", "failed %d\n", err)) goto cleanup; memset(&link_info, 0, sizeof(link_info)); err = bpf_obj_get_info_by_fd(bpf_link__fd(link), &link_info, &link_info_len); if (CHECK(err, "link_info", "failed: %d\n", err)) goto cleanup; CHECK(link_info.prog_id != id1, "link_prog_id", "got %u != exp %u\n", link_info.prog_id, id1); /* ifindex should be zeroed out */ CHECK(link_info.xdp.ifindex != 0, "link_ifindex", "got %u != exp %u\n", link_info.xdp.ifindex, 0); cleanup: test_xdp_link__destroy(skel1); test_xdp_link__destroy(skel2); } |