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b3a091d1 | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
86ab59a6 | 2 | /* |
d937a74b | 3 | * m_bpf.c BPF based action module |
86ab59a6 | 4 | * |
86ab59a6 | 5 | * Authors: Jiri Pirko <jiri@resnulli.us> |
6256f8c9 | 6 | * Daniel Borkmann <daniel@iogearbox.net> |
86ab59a6 JP |
7 | */ |
8 | ||
9 | #include <stdio.h> | |
10 | #include <stdlib.h> | |
32e93fb7 | 11 | |
6256f8c9 | 12 | #include <linux/bpf.h> |
86ab59a6 JP |
13 | #include <linux/tc_act/tc_bpf.h> |
14 | ||
15 | #include "utils.h" | |
e4225669 | 16 | |
86ab59a6 | 17 | #include "tc_util.h" |
e4225669 | 18 | #include "bpf_util.h" |
86ab59a6 | 19 | |
6256f8c9 DB |
20 | static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_ACT; |
21 | ||
86ab59a6 JP |
22 | static void explain(void) |
23 | { | |
8589eb4e MC |
24 | fprintf(stderr, |
25 | "Usage: ... bpf ... [ index INDEX ]\n" | |
26 | "\n" | |
27 | "BPF use case:\n" | |
28 | " bytecode BPF_BYTECODE\n" | |
29 | " bytecode-file FILE\n" | |
30 | "\n" | |
31 | "eBPF use case:\n" | |
32 | " object-file FILE [ section ACT_NAME ] [ export UDS_FILE ]" | |
33 | " [ verbose ]\n" | |
34 | " object-pinned FILE\n" | |
35 | "\n" | |
36 | "Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n" | |
37 | "c,t,f,k and s are decimals; s denotes number of 4-tuples\n" | |
38 | "\n" | |
39 | "Where FILE points to a file containing the BPF_BYTECODE string,\n" | |
40 | "an ELF file containing eBPF map definitions and bytecode, or a\n" | |
41 | "pinned eBPF program.\n" | |
42 | "\n" | |
43 | "Where ACT_NAME refers to the section name containing the\n" | |
44 | "action (default \'%s\').\n" | |
45 | "\n" | |
46 | "Where UDS_FILE points to a unix domain socket file in order\n" | |
47 | "to hand off control of all created eBPF maps to an agent.\n" | |
48 | "\n" | |
49 | "Where optionally INDEX points to an existing action, or\n" | |
50 | "explicitly specifies an action index upon creation.\n", | |
51 | bpf_prog_to_default_section(bpf_type)); | |
86ab59a6 JP |
52 | } |
53 | ||
e4225669 DB |
54 | static void bpf_cbpf_cb(void *nl, const struct sock_filter *ops, int ops_len) |
55 | { | |
56 | addattr16(nl, MAX_MSG, TCA_ACT_BPF_OPS_LEN, ops_len); | |
57 | addattr_l(nl, MAX_MSG, TCA_ACT_BPF_OPS, ops, | |
58 | ops_len * sizeof(struct sock_filter)); | |
59 | } | |
60 | ||
61 | static void bpf_ebpf_cb(void *nl, int fd, const char *annotation) | |
62 | { | |
63 | addattr32(nl, MAX_MSG, TCA_ACT_BPF_FD, fd); | |
64 | addattrstrz(nl, MAX_MSG, TCA_ACT_BPF_NAME, annotation); | |
65 | } | |
66 | ||
67 | static const struct bpf_cfg_ops bpf_cb_ops = { | |
68 | .cbpf_cb = bpf_cbpf_cb, | |
69 | .ebpf_cb = bpf_ebpf_cb, | |
70 | }; | |
71 | ||
38b0e6c1 | 72 | static int bpf_parse_opt(const struct action_util *a, int *ptr_argc, char ***ptr_argv, |
32e93fb7 | 73 | int tca_id, struct nlmsghdr *n) |
86ab59a6 | 74 | { |
32e93fb7 | 75 | const char *bpf_obj = NULL, *bpf_uds_name = NULL; |
e67aba55 | 76 | struct tc_act_bpf parm = {}; |
e4225669 | 77 | struct bpf_cfg_in cfg = {}; |
32e93fb7 | 78 | bool seen_run = false; |
86ab59a6 | 79 | struct rtattr *tail; |
32e93fb7 DB |
80 | int argc, ret = 0; |
81 | char **argv; | |
82 | ||
83 | argv = *ptr_argv; | |
84 | argc = *ptr_argc; | |
86ab59a6 JP |
85 | |
86 | if (matches(*argv, "bpf") != 0) | |
87 | return -1; | |
88 | ||
89 | NEXT_ARG(); | |
90 | ||
c14f9d92 | 91 | tail = addattr_nest(n, MAX_MSG, tca_id); |
32e93fb7 | 92 | |
86ab59a6 JP |
93 | while (argc > 0) { |
94 | if (matches(*argv, "run") == 0) { | |
86ab59a6 | 95 | NEXT_ARG(); |
67c857df JK |
96 | |
97 | if (seen_run) | |
98 | duparg("run", *argv); | |
6256f8c9 | 99 | opt_bpf: |
6256f8c9 | 100 | seen_run = true; |
658cfebc | 101 | cfg.type = bpf_type; |
e4225669 DB |
102 | cfg.argc = argc; |
103 | cfg.argv = argv; | |
104 | ||
399db839 | 105 | if (bpf_parse_and_load_common(&cfg, &bpf_cb_ops, n)) |
86ab59a6 | 106 | return -1; |
e4225669 DB |
107 | |
108 | argc = cfg.argc; | |
109 | argv = cfg.argv; | |
110 | ||
111 | bpf_obj = cfg.object; | |
112 | bpf_uds_name = cfg.uds; | |
86ab59a6 | 113 | } else if (matches(*argv, "help") == 0) { |
32e93fb7 DB |
114 | explain(); |
115 | return -1; | |
baed9084 DB |
116 | } else if (matches(*argv, "index") == 0) { |
117 | break; | |
86ab59a6 | 118 | } else { |
6256f8c9 DB |
119 | if (!seen_run) |
120 | goto opt_bpf; | |
86ab59a6 JP |
121 | break; |
122 | } | |
343dc908 DB |
123 | |
124 | NEXT_ARG_FWD(); | |
86ab59a6 JP |
125 | } |
126 | ||
e67aba55 JP |
127 | parse_action_control_dflt(&argc, &argv, &parm.action, |
128 | false, TC_ACT_PIPE); | |
86ab59a6 JP |
129 | |
130 | if (argc) { | |
131 | if (matches(*argv, "index") == 0) { | |
132 | NEXT_ARG(); | |
133 | if (get_u32(&parm.index, *argv, 10)) { | |
134 | fprintf(stderr, "bpf: Illegal \"index\"\n"); | |
135 | return -1; | |
136 | } | |
343dc908 DB |
137 | |
138 | NEXT_ARG_FWD(); | |
86ab59a6 JP |
139 | } |
140 | } | |
141 | ||
86ab59a6 | 142 | addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm)); |
c14f9d92 | 143 | addattr_nest_end(n, tail); |
86ab59a6 | 144 | |
6256f8c9 | 145 | if (bpf_uds_name) |
4bd62446 | 146 | ret = bpf_send_map_fds(bpf_uds_name, bpf_obj); |
6256f8c9 | 147 | |
32e93fb7 DB |
148 | *ptr_argc = argc; |
149 | *ptr_argv = argv; | |
150 | ||
6256f8c9 | 151 | return ret; |
86ab59a6 JP |
152 | } |
153 | ||
38b0e6c1 | 154 | static int bpf_print_opt(const struct action_util *au, FILE *f, struct rtattr *arg) |
86ab59a6 JP |
155 | { |
156 | struct rtattr *tb[TCA_ACT_BPF_MAX + 1]; | |
157 | struct tc_act_bpf *parm; | |
52d57f6b | 158 | int d_ok = 0; |
32a121cb | 159 | |
a99ebeee | 160 | print_string(PRINT_ANY, "kind", "%s ", "bpf"); |
86ab59a6 | 161 | if (arg == NULL) |
a99ebeee | 162 | return 0; |
86ab59a6 JP |
163 | |
164 | parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg); | |
165 | ||
166 | if (!tb[TCA_ACT_BPF_PARMS]) { | |
d5ddb441 | 167 | fprintf(stderr, "Missing bpf parameters\n"); |
86ab59a6 JP |
168 | return -1; |
169 | } | |
6256f8c9 | 170 | |
86ab59a6 | 171 | parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]); |
6256f8c9 DB |
172 | |
173 | if (tb[TCA_ACT_BPF_NAME]) | |
52d57f6b DC |
174 | print_string(PRINT_ANY, "bpf_name", "%s ", |
175 | rta_getattr_str(tb[TCA_ACT_BPF_NAME])); | |
6256f8c9 | 176 | if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN]) { |
52d57f6b | 177 | bpf_print_ops(tb[TCA_ACT_BPF_OPS], |
86ab59a6 | 178 | rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN])); |
52d57f6b | 179 | print_string(PRINT_FP, NULL, "%s", " "); |
6256f8c9 | 180 | } |
86ab59a6 | 181 | |
a0b5b7cf | 182 | if (tb[TCA_ACT_BPF_ID]) |
52d57f6b DC |
183 | d_ok = bpf_dump_prog_info(f, |
184 | rta_getattr_u32(tb[TCA_ACT_BPF_ID])); | |
185 | if (!d_ok && tb[TCA_ACT_BPF_TAG]) { | |
e37d706b DB |
186 | SPRINT_BUF(b); |
187 | ||
52d57f6b DC |
188 | print_string(PRINT_ANY, "tag", "tag %s ", |
189 | hexstring_n2a(RTA_DATA(tb[TCA_ACT_BPF_TAG]), | |
190 | RTA_PAYLOAD(tb[TCA_ACT_BPF_TAG]), | |
191 | b, sizeof(b))); | |
e37d706b DB |
192 | } |
193 | ||
52d57f6b DC |
194 | print_action_control(f, "default-action ", parm->action, _SL_); |
195 | print_uint(PRINT_ANY, "index", "\t index %u", parm->index); | |
196 | print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt); | |
197 | print_int(PRINT_ANY, "bind", " bind %d", parm->bindcnt); | |
86ab59a6 JP |
198 | |
199 | if (show_stats) { | |
200 | if (tb[TCA_ACT_BPF_TM]) { | |
201 | struct tcf_t *tm = RTA_DATA(tb[TCA_ACT_BPF_TM]); | |
32a121cb | 202 | |
86ab59a6 JP |
203 | print_tm(f, tm); |
204 | } | |
205 | } | |
206 | ||
46031294 | 207 | print_string(PRINT_FP, NULL, "%s", "\n "); |
86ab59a6 JP |
208 | return 0; |
209 | } | |
210 | ||
211 | struct action_util bpf_action_util = { | |
32e93fb7 DB |
212 | .id = "bpf", |
213 | .parse_aopt = bpf_parse_opt, | |
214 | .print_aopt = bpf_print_opt, | |
86ab59a6 | 215 | }; |