Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 1 | /* |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 2 | * m_bpf.c BPF based action module |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 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> |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 10 | * Daniel Borkmann <daniel@iogearbox.net> |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 11 | */ |
| 12 | |
| 13 | #include <stdio.h> |
| 14 | #include <stdlib.h> |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 15 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 16 | #include <linux/bpf.h> |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 17 | #include <linux/tc_act/tc_bpf.h> |
| 18 | |
| 19 | #include "utils.h" |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 20 | #include "tc_util.h" |
| 21 | #include "tc_bpf.h" |
| 22 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 23 | static const enum bpf_prog_type bpf_type = BPF_PROG_TYPE_SCHED_ACT; |
| 24 | |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 25 | static const int nla_tbl[BPF_NLA_MAX] = { |
| 26 | [BPF_NLA_OPS_LEN] = TCA_ACT_BPF_OPS_LEN, |
| 27 | [BPF_NLA_OPS] = TCA_ACT_BPF_OPS, |
| 28 | [BPF_NLA_FD] = TCA_ACT_BPF_FD, |
| 29 | [BPF_NLA_NAME] = TCA_ACT_BPF_NAME, |
| 30 | }; |
| 31 | |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 32 | static void explain(void) |
| 33 | { |
Daniel Borkmann | baed908 | 2015-08-07 11:36:50 +0200 | [diff] [blame] | 34 | fprintf(stderr, "Usage: ... bpf ... [ index INDEX ]\n"); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 35 | fprintf(stderr, "\n"); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 36 | fprintf(stderr, "BPF use case:\n"); |
| 37 | fprintf(stderr, " bytecode BPF_BYTECODE\n"); |
| 38 | fprintf(stderr, " bytecode-file FILE\n"); |
| 39 | fprintf(stderr, "\n"); |
| 40 | fprintf(stderr, "eBPF use case:\n"); |
Daniel Borkmann | d937a74 | 2015-04-28 13:37:42 +0200 | [diff] [blame] | 41 | fprintf(stderr, " object-file FILE [ section ACT_NAME ] [ export UDS_FILE ]"); |
| 42 | fprintf(stderr, " [ verbose ]\n"); |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 43 | fprintf(stderr, " object-pinned FILE\n"); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 44 | fprintf(stderr, "\n"); |
| 45 | fprintf(stderr, "Where BPF_BYTECODE := \'s,c t f k,c t f k,c t f k,...\'\n"); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 46 | fprintf(stderr, "c,t,f,k and s are decimals; s denotes number of 4-tuples\n"); |
| 47 | fprintf(stderr, "\n"); |
| 48 | fprintf(stderr, "Where FILE points to a file containing the BPF_BYTECODE string,\n"); |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 49 | fprintf(stderr, "an ELF file containing eBPF map definitions and bytecode, or a\n"); |
| 50 | fprintf(stderr, "pinned eBPF program.\n"); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 51 | fprintf(stderr, "\n"); |
| 52 | fprintf(stderr, "Where ACT_NAME refers to the section name containing the\n"); |
| 53 | fprintf(stderr, "action (default \'%s\').\n", bpf_default_section(bpf_type)); |
| 54 | fprintf(stderr, "\n"); |
| 55 | fprintf(stderr, "Where UDS_FILE points to a unix domain socket file in order\n"); |
| 56 | fprintf(stderr, "to hand off control of all created eBPF maps to an agent.\n"); |
Daniel Borkmann | baed908 | 2015-08-07 11:36:50 +0200 | [diff] [blame] | 57 | fprintf(stderr, "\n"); |
| 58 | fprintf(stderr, "Where optionally INDEX points to an existing action, or\n"); |
| 59 | fprintf(stderr, "explicitly specifies an action index upon creation.\n"); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 60 | } |
| 61 | |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 62 | static int bpf_parse_opt(struct action_util *a, int *ptr_argc, char ***ptr_argv, |
| 63 | int tca_id, struct nlmsghdr *n) |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 64 | { |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 65 | const char *bpf_obj = NULL, *bpf_uds_name = NULL; |
| 66 | struct tc_act_bpf parm; |
| 67 | bool seen_run = false; |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 68 | struct rtattr *tail; |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 69 | int argc, ret = 0; |
| 70 | char **argv; |
| 71 | |
| 72 | argv = *ptr_argv; |
| 73 | argc = *ptr_argc; |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 74 | |
| 75 | if (matches(*argv, "bpf") != 0) |
| 76 | return -1; |
| 77 | |
| 78 | NEXT_ARG(); |
| 79 | |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 80 | tail = NLMSG_TAIL(n); |
| 81 | addattr_l(n, MAX_MSG, tca_id, NULL, 0); |
| 82 | |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 83 | while (argc > 0) { |
| 84 | if (matches(*argv, "run") == 0) { |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 85 | NEXT_ARG(); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 86 | opt_bpf: |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 87 | seen_run = true; |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 88 | if (bpf_parse_common(&argc, &argv, nla_tbl, bpf_type, |
| 89 | &bpf_obj, &bpf_uds_name, n)) { |
| 90 | fprintf(stderr, "Failed to retrieve (e)BPF data!\n"); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 91 | return -1; |
| 92 | } |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 93 | } else if (matches(*argv, "help") == 0) { |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 94 | explain(); |
| 95 | return -1; |
Daniel Borkmann | baed908 | 2015-08-07 11:36:50 +0200 | [diff] [blame] | 96 | } else if (matches(*argv, "index") == 0) { |
| 97 | break; |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 98 | } else { |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 99 | if (!seen_run) |
| 100 | goto opt_bpf; |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 101 | break; |
| 102 | } |
Daniel Borkmann | 343dc90 | 2015-10-08 15:22:05 +0200 | [diff] [blame] | 103 | |
| 104 | NEXT_ARG_FWD(); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 105 | } |
| 106 | |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 107 | memset(&parm, 0, sizeof(parm)); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 108 | parm.action = TC_ACT_PIPE; |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 109 | |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 110 | if (argc) { |
| 111 | if (matches(*argv, "reclassify") == 0) { |
| 112 | parm.action = TC_ACT_RECLASSIFY; |
Daniel Borkmann | 343dc90 | 2015-10-08 15:22:05 +0200 | [diff] [blame] | 113 | NEXT_ARG_FWD(); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 114 | } else if (matches(*argv, "pipe") == 0) { |
| 115 | parm.action = TC_ACT_PIPE; |
Daniel Borkmann | 343dc90 | 2015-10-08 15:22:05 +0200 | [diff] [blame] | 116 | NEXT_ARG_FWD(); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 117 | } else if (matches(*argv, "drop") == 0 || |
| 118 | matches(*argv, "shot") == 0) { |
| 119 | parm.action = TC_ACT_SHOT; |
Daniel Borkmann | 343dc90 | 2015-10-08 15:22:05 +0200 | [diff] [blame] | 120 | NEXT_ARG_FWD(); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 121 | } else if (matches(*argv, "continue") == 0) { |
| 122 | parm.action = TC_ACT_UNSPEC; |
Daniel Borkmann | 343dc90 | 2015-10-08 15:22:05 +0200 | [diff] [blame] | 123 | NEXT_ARG_FWD(); |
| 124 | } else if (matches(*argv, "pass") == 0 || |
| 125 | matches(*argv, "ok") == 0) { |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 126 | parm.action = TC_ACT_OK; |
Daniel Borkmann | 343dc90 | 2015-10-08 15:22:05 +0200 | [diff] [blame] | 127 | NEXT_ARG_FWD(); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 128 | } |
| 129 | } |
| 130 | |
| 131 | if (argc) { |
| 132 | if (matches(*argv, "index") == 0) { |
| 133 | NEXT_ARG(); |
| 134 | if (get_u32(&parm.index, *argv, 10)) { |
| 135 | fprintf(stderr, "bpf: Illegal \"index\"\n"); |
| 136 | return -1; |
| 137 | } |
Daniel Borkmann | 343dc90 | 2015-10-08 15:22:05 +0200 | [diff] [blame] | 138 | |
| 139 | NEXT_ARG_FWD(); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 140 | } |
| 141 | } |
| 142 | |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 143 | addattr_l(n, MAX_MSG, TCA_ACT_BPF_PARMS, &parm, sizeof(parm)); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 144 | tail->rta_len = (char *)NLMSG_TAIL(n) - (char *)tail; |
| 145 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 146 | if (bpf_uds_name) |
Daniel Borkmann | 4bd6244 | 2015-04-16 21:20:06 +0200 | [diff] [blame] | 147 | ret = bpf_send_map_fds(bpf_uds_name, bpf_obj); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 148 | |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 149 | *ptr_argc = argc; |
| 150 | *ptr_argv = argv; |
| 151 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 152 | return ret; |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 153 | } |
| 154 | |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 155 | static int bpf_print_opt(struct action_util *au, FILE *f, struct rtattr *arg) |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 156 | { |
| 157 | struct rtattr *tb[TCA_ACT_BPF_MAX + 1]; |
| 158 | struct tc_act_bpf *parm; |
Stephen Hemminger | 32a121c | 2016-03-21 11:48:36 -0700 | [diff] [blame] | 159 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 160 | SPRINT_BUF(action_buf); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 161 | |
| 162 | if (arg == NULL) |
| 163 | return -1; |
| 164 | |
| 165 | parse_rtattr_nested(tb, TCA_ACT_BPF_MAX, arg); |
| 166 | |
| 167 | if (!tb[TCA_ACT_BPF_PARMS]) { |
| 168 | fprintf(f, "[NULL bpf parameters]"); |
| 169 | return -1; |
| 170 | } |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 171 | |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 172 | parm = RTA_DATA(tb[TCA_ACT_BPF_PARMS]); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 173 | fprintf(f, "bpf "); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 174 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 175 | if (tb[TCA_ACT_BPF_NAME]) |
| 176 | fprintf(f, "%s ", rta_getattr_str(tb[TCA_ACT_BPF_NAME])); |
| 177 | else if (tb[TCA_ACT_BPF_FD]) |
| 178 | fprintf(f, "pfd %u ", rta_getattr_u32(tb[TCA_ACT_BPF_FD])); |
| 179 | |
| 180 | if (tb[TCA_ACT_BPF_OPS] && tb[TCA_ACT_BPF_OPS_LEN]) { |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 181 | bpf_print_ops(f, tb[TCA_ACT_BPF_OPS], |
| 182 | rta_getattr_u16(tb[TCA_ACT_BPF_OPS_LEN])); |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 183 | fprintf(f, " "); |
| 184 | } |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 185 | |
Daniel Borkmann | 6256f8c | 2015-04-01 17:57:44 +0200 | [diff] [blame] | 186 | fprintf(f, "default-action %s\n", action_n2a(parm->action, action_buf, |
| 187 | sizeof(action_buf))); |
| 188 | fprintf(f, "\tindex %d ref %d bind %d", parm->index, parm->refcnt, |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 189 | parm->bindcnt); |
| 190 | |
| 191 | if (show_stats) { |
| 192 | if (tb[TCA_ACT_BPF_TM]) { |
| 193 | struct tcf_t *tm = RTA_DATA(tb[TCA_ACT_BPF_TM]); |
Stephen Hemminger | 32a121c | 2016-03-21 11:48:36 -0700 | [diff] [blame] | 194 | |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 195 | print_tm(f, tm); |
| 196 | } |
| 197 | } |
| 198 | |
| 199 | fprintf(f, "\n "); |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | struct action_util bpf_action_util = { |
Daniel Borkmann | 32e93fb | 2015-11-13 00:39:29 +0100 | [diff] [blame] | 204 | .id = "bpf", |
| 205 | .parse_aopt = bpf_parse_opt, |
| 206 | .print_aopt = bpf_print_opt, |
Jiri Pirko | 86ab59a | 2015-01-19 16:56:30 +0100 | [diff] [blame] | 207 | }; |