]>
Commit | Line | Data |
---|---|---|
86ab59a6 | 1 | /* |
d937a74b | 2 | * m_bpf.c BPF based action module |
86ab59a6 JP |
3 | * |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version | |
7 | * 2 of the License, or (at your option) any later version. | |
8 | * | |
9 | * Authors: Jiri Pirko <jiri@resnulli.us> | |
6256f8c9 | 10 | * Daniel Borkmann <daniel@iogearbox.net> |
86ab59a6 JP |
11 | */ |
12 | ||
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
32e93fb7 | 15 | |
6256f8c9 | 16 | #include <linux/bpf.h> |
86ab59a6 JP |
17 | #include <linux/tc_act/tc_bpf.h> |
18 | ||
19 | #include "utils.h" | |
e4225669 | 20 | |
86ab59a6 | 21 | #include "tc_util.h" |
e4225669 | 22 | #include "bpf_util.h" |
86ab59a6 | 23 | |
6256f8c9 DB |
24 | static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_ACT; |
25 | ||
86ab59a6 JP |
26 | static void explain(void) |
27 | { | |
8589eb4e MC |
28 | fprintf(stderr, |
29 | "Usage: ... bpf ... [ index INDEX ]\n" | |
30 | "\n" | |
31 | "BPF use case:\n" | |
32 | " bytecode BPF_BYTECODE\n" | |
33 | " bytecode-file FILE\n" | |
34 | "\n" | |
35 | "eBPF use case:\n" | |
36 | " object-file FILE [ section ACT_NAME ] [ export UDS_FILE ]" | |
37 | " [ verbose ]\n" | |
38 | " object-pinned FILE\n" | |
39 | "\n" | |
40 | "Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n" | |
41 | "c,t,f,k and s are decimals; s denotes number of 4-tuples\n" | |
42 | "\n" | |
43 | "Where FILE points to a file containing the BPF_BYTECODE string,\n" | |
44 | "an ELF file containing eBPF map definitions and bytecode, or a\n" | |
45 | "pinned eBPF program.\n" | |
46 | "\n" | |
47 | "Where ACT_NAME refers to the section name containing the\n" | |
48 | "action (default \'%s\').\n" | |
49 | "\n" | |
50 | "Where UDS_FILE points to a unix domain socket file in order\n" | |
51 | "to hand off control of all created eBPF maps to an agent.\n" | |
52 | "\n" | |
53 | "Where optionally INDEX points to an existing action, or\n" | |
54 | "explicitly specifies an action index upon creation.\n", | |
55 | bpf_prog_to_default_section(bpf_type)); | |
86ab59a6 JP |
56 | } |
57 | ||
e4225669 DB |
58 | static void bpf_cbpf_cb(void *nl, const struct sock_filter *ops, int ops_len) |
59 | { | |
60 | addattr16(nl, MAX_MSG, TCA_ACT_BPF_OPS_LEN, ops_len); | |
61 | addattr_l(nl, MAX_MSG, TCA_ACT_BPF_OPS, ops, | |
62 | ops_len * sizeof(struct sock_filter)); | |
63 | } | |
64 | ||
65 | static void bpf_ebpf_cb(void *nl, int fd, const char *annotation) | |
66 | { | |
67 | addattr32(nl, MAX_MSG, TCA_ACT_BPF_FD, fd); | |
68 | addattrstrz(nl, MAX_MSG, TCA_ACT_BPF_NAME, annotation); | |
69 | } | |
70 | ||
71 | static const struct bpf_cfg_ops bpf_cb_ops = { | |
72 | .cbpf_cb = bpf_cbpf_cb, | |
73 | .ebpf_cb = bpf_ebpf_cb, | |
74 | }; | |
75 | ||
32e93fb7 DB |
76 | static int bpf_parse_opt(struct action_util *a, int *ptr_argc, char ***ptr_argv, |
77 | int tca_id, struct nlmsghdr *n) | |
86ab59a6 | 78 | { |
32e93fb7 | 79 | const char *bpf_obj = NULL, *bpf_uds_name = NULL; |
e67aba55 | 80 | struct tc_act_bpf parm = {}; |
e4225669 | 81 | struct bpf_cfg_in cfg = {}; |
32e93fb7 | 82 | bool seen_run = false; |
86ab59a6 | 83 | struct rtattr *tail; |
32e93fb7 DB |
84 | int argc, ret = 0; |
85 | char **argv; | |
86 | ||
87 | argv = *ptr_argv; | |
88 | argc = *ptr_argc; | |
86ab59a6 JP |
89 | |
90 | if (matches(*argv, "bpf") != 0) | |
91 | return -1; | |
92 | ||
93 | NEXT_ARG(); | |
94 | ||
c14f9d92 | 95 | tail = addattr_nest(n, MAX_MSG, tca_id); |
32e93fb7 | 96 | |
86ab59a6 JP |
97 | while (argc > 0) { |
98 | if (matches(*argv, "run") == 0) { | |
86ab59a6 | 99 | NEXT_ARG(); |
67c857df JK |
100 | |
101 | if (seen_run) | |
102 | duparg("run", *argv); | |
6256f8c9 | 103 | opt_bpf: |
6256f8c9 | 104 | seen_run = true; |
658cfebc | 105 | cfg.type = bpf_type; |
e4225669 DB |
106 | cfg.argc = argc; |
107 | cfg.argv = argv; | |
108 | ||
399db839 | 109 | if (bpf_parse_and_load_common(&cfg, &bpf_cb_ops, n)) |
86ab59a6 | 110 | return -1; |
e4225669 DB |
111 | |
112 | argc = cfg.argc; | |
113 | argv = cfg.argv; | |
114 | ||
115 | bpf_obj = cfg.object; | |
116 | bpf_uds_name = cfg.uds; | |
86ab59a6 | 117 | } else if (matches(*argv, "help") == 0) { |
32e93fb7 DB |
118 | explain(); |
119 | return -1; | |
baed9084 DB |
120 | } else if (matches(*argv, "index") == 0) { |
121 | break; | |
86ab59a6 | 122 | } else { |
6256f8c9 DB |
123 | if (!seen_run) |
124 | goto opt_bpf; | |
86ab59a6 JP |
125 | break; |
126 | } | |
343dc908 DB |
127 | |
128 | NEXT_ARG_FWD(); | |
86ab59a6 JP |
129 | } |
130 | ||
e67aba55 JP |
131 | parse_action_control_dflt(&argc, &argv, &parm.action, |
132 | false, TC_ACT_PIPE); | |
86ab59a6 JP |
133 | |
134 | if (argc) { | |
135 | if (matches(*argv, "index") == 0) { | |
136 | NEXT_ARG(); | |
137 | if (get_u32(&parm.index, *argv, 10)) { | |
138 | fprintf(stderr, "bpf: Illegal \"index\"\n"); | |
139 | return -1; | |
140 | } | |
343dc908 DB |
141 | |
142 | NEXT_ARG_FWD(); | |
86ab59a6 JP |
143 | } |
144 | } | |
145 | ||
86ab59a6 | 146 | addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm)); |
c14f9d92 | 147 | addattr_nest_end(n, tail); |
86ab59a6 | 148 | |
6256f8c9 | 149 | if (bpf_uds_name) |
4bd62446 | 150 | ret = bpf_send_map_fds(bpf_uds_name, bpf_obj); |
6256f8c9 | 151 | |
32e93fb7 DB |
152 | *ptr_argc = argc; |
153 | *ptr_argv = argv; | |
154 | ||
6256f8c9 | 155 | return ret; |
86ab59a6 JP |
156 | } |
157 | ||
32e93fb7 | 158 | static int bpf_print_opt(struct action_util *au, FILE *f, struct rtattr *arg) |
86ab59a6 JP |
159 | { |
160 | struct rtattr *tb[TCA_ACT_BPF_MAX + 1]; | |
161 | struct tc_act_bpf *parm; | |
52d57f6b | 162 | int d_ok = 0; |
32a121cb | 163 | |
a99ebeee | 164 | print_string(PRINT_ANY, "kind", "%s ", "bpf"); |
86ab59a6 | 165 | if (arg == NULL) |
a99ebeee | 166 | return 0; |
86ab59a6 JP |
167 | |
168 | parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg); | |
169 | ||
170 | if (!tb[TCA_ACT_BPF_PARMS]) { | |
d5ddb441 | 171 | fprintf(stderr, "Missing bpf parameters\n"); |
86ab59a6 JP |
172 | return -1; |
173 | } | |
6256f8c9 | 174 | |
86ab59a6 | 175 | parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]); |
6256f8c9 DB |
176 | |
177 | if (tb[TCA_ACT_BPF_NAME]) | |
52d57f6b DC |
178 | print_string(PRINT_ANY, "bpf_name", "%s ", |
179 | rta_getattr_str(tb[TCA_ACT_BPF_NAME])); | |
6256f8c9 | 180 | if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN]) { |
52d57f6b | 181 | bpf_print_ops(tb[TCA_ACT_BPF_OPS], |
86ab59a6 | 182 | rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN])); |
52d57f6b | 183 | print_string(PRINT_FP, NULL, "%s", " "); |
6256f8c9 | 184 | } |
86ab59a6 | 185 | |
a0b5b7cf | 186 | if (tb[TCA_ACT_BPF_ID]) |
52d57f6b DC |
187 | d_ok = bpf_dump_prog_info(f, |
188 | rta_getattr_u32(tb[TCA_ACT_BPF_ID])); | |
189 | if (!d_ok && tb[TCA_ACT_BPF_TAG]) { | |
e37d706b DB |
190 | SPRINT_BUF(b); |
191 | ||
52d57f6b DC |
192 | print_string(PRINT_ANY, "tag", "tag %s ", |
193 | hexstring_n2a(RTA_DATA(tb[TCA_ACT_BPF_TAG]), | |
194 | RTA_PAYLOAD(tb[TCA_ACT_BPF_TAG]), | |
195 | b, sizeof(b))); | |
e37d706b DB |
196 | } |
197 | ||
52d57f6b DC |
198 | print_action_control(f, "default-action ", parm->action, _SL_); |
199 | print_uint(PRINT_ANY, "index", "\t index %u", parm->index); | |
200 | print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt); | |
201 | print_int(PRINT_ANY, "bind", " bind %d", parm->bindcnt); | |
86ab59a6 JP |
202 | |
203 | if (show_stats) { | |
204 | if (tb[TCA_ACT_BPF_TM]) { | |
205 | struct tcf_t *tm = RTA_DATA(tb[TCA_ACT_BPF_TM]); | |
32a121cb | 206 | |
86ab59a6 JP |
207 | print_tm(f, tm); |
208 | } | |
209 | } | |
210 | ||
211 | fprintf(f, "\n "); | |
86ab59a6 JP |
212 | return 0; |
213 | } | |
214 | ||
215 | struct action_util bpf_action_util = { | |
32e93fb7 DB |
216 | .id = "bpf", |
217 | .parse_aopt = bpf_parse_opt, | |
218 | .print_aopt = bpf_print_opt, | |
86ab59a6 | 219 | }; |