Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Berkeley Packet Filter based traffic classifier |
| 3 | * |
| 4 | * Might be used to classify traffic through flexible, user-defined and |
| 5 | * possibly JIT-ed BPF filters for traffic control as an alternative to |
| 6 | * ematches. |
| 7 | * |
| 8 | * (C) 2013 Daniel Borkmann <dborkman@redhat.com> |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License version 2 as |
| 12 | * published by the Free Software Foundation. |
| 13 | */ |
| 14 | |
| 15 | #include <linux/module.h> |
| 16 | #include <linux/types.h> |
| 17 | #include <linux/skbuff.h> |
| 18 | #include <linux/filter.h> |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 19 | #include <linux/bpf.h> |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 20 | #include <linux/idr.h> |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 21 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 22 | #include <net/rtnetlink.h> |
| 23 | #include <net/pkt_cls.h> |
| 24 | #include <net/sock.h> |
| 25 | |
| 26 | MODULE_LICENSE("GPL"); |
| 27 | MODULE_AUTHOR("Daniel Borkmann <dborkman@redhat.com>"); |
| 28 | MODULE_DESCRIPTION("TC BPF based classifier"); |
| 29 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 30 | #define CLS_BPF_NAME_LEN 256 |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 31 | #define CLS_BPF_SUPPORTED_GEN_FLAGS \ |
Jakub Kicinski | eadb414 | 2016-09-21 11:43:55 +0100 | [diff] [blame] | 32 | (TCA_CLS_FLAGS_SKIP_HW | TCA_CLS_FLAGS_SKIP_SW) |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 33 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 34 | struct cls_bpf_head { |
| 35 | struct list_head plist; |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 36 | struct idr handle_idr; |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 37 | struct rcu_head rcu; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 38 | }; |
| 39 | |
| 40 | struct cls_bpf_prog { |
Alexei Starovoitov | 7ae457c | 2014-07-30 20:34:16 -0700 | [diff] [blame] | 41 | struct bpf_prog *filter; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 42 | struct list_head link; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 43 | struct tcf_result res; |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 44 | bool exts_integrated; |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 45 | u32 gen_flags; |
John Hurley | 7e916b7 | 2018-06-25 14:30:09 -0700 | [diff] [blame] | 46 | unsigned int in_hw_count; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 47 | struct tcf_exts exts; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 48 | u32 handle; |
Daniel Borkmann | 55556dd | 2016-11-26 01:28:05 +0100 | [diff] [blame] | 49 | u16 bpf_num_ops; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 50 | struct sock_filter *bpf_ops; |
| 51 | const char *bpf_name; |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 52 | struct tcf_proto *tp; |
Cong Wang | aaa908f | 2018-05-23 15:26:53 -0700 | [diff] [blame] | 53 | struct rcu_work rwork; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 54 | }; |
| 55 | |
| 56 | static const struct nla_policy bpf_policy[TCA_BPF_MAX + 1] = { |
| 57 | [TCA_BPF_CLASSID] = { .type = NLA_U32 }, |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 58 | [TCA_BPF_FLAGS] = { .type = NLA_U32 }, |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 59 | [TCA_BPF_FLAGS_GEN] = { .type = NLA_U32 }, |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 60 | [TCA_BPF_FD] = { .type = NLA_U32 }, |
Jamal Hadi Salim | 5a7a555 | 2016-09-18 08:45:33 -0400 | [diff] [blame] | 61 | [TCA_BPF_NAME] = { .type = NLA_NUL_STRING, |
| 62 | .len = CLS_BPF_NAME_LEN }, |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 63 | [TCA_BPF_OPS_LEN] = { .type = NLA_U16 }, |
| 64 | [TCA_BPF_OPS] = { .type = NLA_BINARY, |
| 65 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, |
| 66 | }; |
| 67 | |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 68 | static int cls_bpf_exec_opcode(int code) |
| 69 | { |
| 70 | switch (code) { |
| 71 | case TC_ACT_OK: |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 72 | case TC_ACT_SHOT: |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 73 | case TC_ACT_STOLEN: |
Jiri Pirko | e25ea21 | 2017-06-06 14:12:02 +0200 | [diff] [blame] | 74 | case TC_ACT_TRAP: |
Alexei Starovoitov | 27b29f6 | 2015-09-15 23:05:43 -0700 | [diff] [blame] | 75 | case TC_ACT_REDIRECT: |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 76 | case TC_ACT_UNSPEC: |
| 77 | return code; |
| 78 | default: |
| 79 | return TC_ACT_UNSPEC; |
| 80 | } |
| 81 | } |
| 82 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 83 | static int cls_bpf_classify(struct sk_buff *skb, const struct tcf_proto *tp, |
| 84 | struct tcf_result *res) |
| 85 | { |
WANG Cong | 80dcbd1 | 2014-09-15 14:21:50 -0700 | [diff] [blame] | 86 | struct cls_bpf_head *head = rcu_dereference_bh(tp->root); |
Daniel Borkmann | fdc5432 | 2016-01-07 15:50:22 +0100 | [diff] [blame] | 87 | bool at_ingress = skb_at_tc_ingress(skb); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 88 | struct cls_bpf_prog *prog; |
Daniel Borkmann | 54720df | 2015-03-12 20:03:12 +0100 | [diff] [blame] | 89 | int ret = -1; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 90 | |
Daniel Borkmann | 54720df | 2015-03-12 20:03:12 +0100 | [diff] [blame] | 91 | /* Needed here for accessing maps. */ |
| 92 | rcu_read_lock(); |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 93 | list_for_each_entry_rcu(prog, &head->plist, link) { |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 94 | int filter_res; |
| 95 | |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 96 | qdisc_skb_cb(skb)->tc_classid = prog->res.classid; |
| 97 | |
Jakub Kicinski | eadb414 | 2016-09-21 11:43:55 +0100 | [diff] [blame] | 98 | if (tc_skip_sw(prog->gen_flags)) { |
| 99 | filter_res = prog->exts_integrated ? TC_ACT_UNSPEC : 0; |
| 100 | } else if (at_ingress) { |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 101 | /* It is safe to push/pull even if skb_shared() */ |
| 102 | __skb_push(skb, skb->mac_len); |
Daniel Borkmann | 6aaae2b | 2017-09-25 02:25:50 +0200 | [diff] [blame] | 103 | bpf_compute_data_pointers(skb); |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 104 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
| 105 | __skb_pull(skb, skb->mac_len); |
| 106 | } else { |
Daniel Borkmann | 6aaae2b | 2017-09-25 02:25:50 +0200 | [diff] [blame] | 107 | bpf_compute_data_pointers(skb); |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 108 | filter_res = BPF_PROG_RUN(prog->filter, skb); |
| 109 | } |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 110 | |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 111 | if (prog->exts_integrated) { |
Daniel Borkmann | 3a461da | 2016-03-15 22:41:22 +0100 | [diff] [blame] | 112 | res->class = 0; |
| 113 | res->classid = TC_H_MAJ(prog->res.classid) | |
| 114 | qdisc_skb_cb(skb)->tc_classid; |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 115 | |
| 116 | ret = cls_bpf_exec_opcode(filter_res); |
| 117 | if (ret == TC_ACT_UNSPEC) |
| 118 | continue; |
| 119 | break; |
| 120 | } |
| 121 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 122 | if (filter_res == 0) |
| 123 | continue; |
Daniel Borkmann | 3a461da | 2016-03-15 22:41:22 +0100 | [diff] [blame] | 124 | if (filter_res != -1) { |
| 125 | res->class = 0; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 126 | res->classid = filter_res; |
Daniel Borkmann | 3a461da | 2016-03-15 22:41:22 +0100 | [diff] [blame] | 127 | } else { |
| 128 | *res = prog->res; |
| 129 | } |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 130 | |
| 131 | ret = tcf_exts_exec(skb, &prog->exts, res); |
| 132 | if (ret < 0) |
| 133 | continue; |
| 134 | |
Daniel Borkmann | 54720df | 2015-03-12 20:03:12 +0100 | [diff] [blame] | 135 | break; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 136 | } |
Daniel Borkmann | 54720df | 2015-03-12 20:03:12 +0100 | [diff] [blame] | 137 | rcu_read_unlock(); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 138 | |
Daniel Borkmann | 54720df | 2015-03-12 20:03:12 +0100 | [diff] [blame] | 139 | return ret; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 140 | } |
| 141 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 142 | static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog) |
| 143 | { |
| 144 | return !prog->bpf_ops; |
| 145 | } |
| 146 | |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 147 | static int cls_bpf_offload_cmd(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
Quentin Monnet | 631f65f | 2018-01-19 17:44:46 -0800 | [diff] [blame] | 148 | struct cls_bpf_prog *oldprog, |
| 149 | struct netlink_ext_ack *extack) |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 150 | { |
Jiri Pirko | 3f7889c | 2017-10-19 15:50:36 +0200 | [diff] [blame] | 151 | struct tcf_block *block = tp->chain->block; |
Jiri Pirko | de4784c | 2017-08-07 10:15:32 +0200 | [diff] [blame] | 152 | struct tc_cls_bpf_offload cls_bpf = {}; |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 153 | struct cls_bpf_prog *obj; |
| 154 | bool skip_sw; |
Or Gerlitz | 5cecb6c | 2017-02-16 10:31:16 +0200 | [diff] [blame] | 155 | int err; |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 156 | |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 157 | skip_sw = prog && tc_skip_sw(prog->gen_flags); |
| 158 | obj = prog ?: oldprog; |
| 159 | |
Jakub Kicinski | a6ffd6b | 2018-01-24 12:54:16 -0800 | [diff] [blame] | 160 | tc_cls_common_offload_init(&cls_bpf.common, tp, obj->gen_flags, |
| 161 | extack); |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 162 | cls_bpf.command = TC_CLSBPF_OFFLOAD; |
| 163 | cls_bpf.exts = &obj->exts; |
| 164 | cls_bpf.prog = prog ? prog->filter : NULL; |
| 165 | cls_bpf.oldprog = oldprog ? oldprog->filter : NULL; |
| 166 | cls_bpf.name = obj->bpf_name; |
| 167 | cls_bpf.exts_integrated = obj->exts_integrated; |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 168 | |
Jiri Pirko | caa7260 | 2018-01-17 11:46:50 +0100 | [diff] [blame] | 169 | if (oldprog) |
| 170 | tcf_block_offload_dec(block, &oldprog->gen_flags); |
| 171 | |
Jiri Pirko | 3f7889c | 2017-10-19 15:50:36 +0200 | [diff] [blame] | 172 | err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, skip_sw); |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 173 | if (prog) { |
Jiri Pirko | 3f7889c | 2017-10-19 15:50:36 +0200 | [diff] [blame] | 174 | if (err < 0) { |
Quentin Monnet | 631f65f | 2018-01-19 17:44:46 -0800 | [diff] [blame] | 175 | cls_bpf_offload_cmd(tp, oldprog, prog, extack); |
Jiri Pirko | 3f7889c | 2017-10-19 15:50:36 +0200 | [diff] [blame] | 176 | return err; |
| 177 | } else if (err > 0) { |
John Hurley | 7e916b7 | 2018-06-25 14:30:09 -0700 | [diff] [blame] | 178 | prog->in_hw_count = err; |
Jiri Pirko | caa7260 | 2018-01-17 11:46:50 +0100 | [diff] [blame] | 179 | tcf_block_offload_inc(block, &prog->gen_flags); |
Jiri Pirko | 3f7889c | 2017-10-19 15:50:36 +0200 | [diff] [blame] | 180 | } |
| 181 | } |
| 182 | |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 183 | if (prog && skip_sw && !(prog->gen_flags & TCA_CLS_FLAGS_IN_HW)) |
Jiri Pirko | 3f7889c | 2017-10-19 15:50:36 +0200 | [diff] [blame] | 184 | return -EINVAL; |
| 185 | |
| 186 | return 0; |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 187 | } |
| 188 | |
Daniel Borkmann | ad9294d | 2018-01-17 22:36:49 +0100 | [diff] [blame] | 189 | static u32 cls_bpf_flags(u32 flags) |
| 190 | { |
| 191 | return flags & CLS_BPF_SUPPORTED_GEN_FLAGS; |
| 192 | } |
| 193 | |
Jakub Kicinski | eadb414 | 2016-09-21 11:43:55 +0100 | [diff] [blame] | 194 | static int cls_bpf_offload(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
Quentin Monnet | 631f65f | 2018-01-19 17:44:46 -0800 | [diff] [blame] | 195 | struct cls_bpf_prog *oldprog, |
| 196 | struct netlink_ext_ack *extack) |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 197 | { |
Daniel Borkmann | ad9294d | 2018-01-17 22:36:49 +0100 | [diff] [blame] | 198 | if (prog && oldprog && |
| 199 | cls_bpf_flags(prog->gen_flags) != |
| 200 | cls_bpf_flags(oldprog->gen_flags)) |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 201 | return -EINVAL; |
Jakub Kicinski | eadb414 | 2016-09-21 11:43:55 +0100 | [diff] [blame] | 202 | |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 203 | if (prog && tc_skip_hw(prog->gen_flags)) |
| 204 | prog = NULL; |
| 205 | if (oldprog && tc_skip_hw(oldprog->gen_flags)) |
| 206 | oldprog = NULL; |
| 207 | if (!prog && !oldprog) |
| 208 | return 0; |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 209 | |
Quentin Monnet | 631f65f | 2018-01-19 17:44:46 -0800 | [diff] [blame] | 210 | return cls_bpf_offload_cmd(tp, prog, oldprog, extack); |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 211 | } |
| 212 | |
| 213 | static void cls_bpf_stop_offload(struct tcf_proto *tp, |
Jakub Kicinski | 0e908a4 | 2018-01-24 12:54:17 -0800 | [diff] [blame] | 214 | struct cls_bpf_prog *prog, |
| 215 | struct netlink_ext_ack *extack) |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 216 | { |
| 217 | int err; |
| 218 | |
Jakub Kicinski | 0e908a4 | 2018-01-24 12:54:17 -0800 | [diff] [blame] | 219 | err = cls_bpf_offload_cmd(tp, NULL, prog, extack); |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 220 | if (err) |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 221 | pr_err("Stopping hardware offload failed: %d\n", err); |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 222 | } |
| 223 | |
Jakub Kicinski | 68d6406 | 2016-09-21 11:44:02 +0100 | [diff] [blame] | 224 | static void cls_bpf_offload_update_stats(struct tcf_proto *tp, |
| 225 | struct cls_bpf_prog *prog) |
| 226 | { |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 227 | struct tcf_block *block = tp->chain->block; |
| 228 | struct tc_cls_bpf_offload cls_bpf = {}; |
Jakub Kicinski | 68d6406 | 2016-09-21 11:44:02 +0100 | [diff] [blame] | 229 | |
Jakub Kicinski | a6ffd6b | 2018-01-24 12:54:16 -0800 | [diff] [blame] | 230 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, NULL); |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 231 | cls_bpf.command = TC_CLSBPF_STATS; |
| 232 | cls_bpf.exts = &prog->exts; |
| 233 | cls_bpf.prog = prog->filter; |
| 234 | cls_bpf.name = prog->bpf_name; |
| 235 | cls_bpf.exts_integrated = prog->exts_integrated; |
Jakub Kicinski | 102740b | 2017-12-19 13:32:13 -0800 | [diff] [blame] | 236 | |
| 237 | tc_setup_cb_call(block, NULL, TC_SETUP_CLSBPF, &cls_bpf, false); |
Jakub Kicinski | 68d6406 | 2016-09-21 11:44:02 +0100 | [diff] [blame] | 238 | } |
| 239 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 240 | static int cls_bpf_init(struct tcf_proto *tp) |
| 241 | { |
| 242 | struct cls_bpf_head *head; |
| 243 | |
| 244 | head = kzalloc(sizeof(*head), GFP_KERNEL); |
| 245 | if (head == NULL) |
| 246 | return -ENOBUFS; |
| 247 | |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 248 | INIT_LIST_HEAD_RCU(&head->plist); |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 249 | idr_init(&head->handle_idr); |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 250 | rcu_assign_pointer(tp->root, head); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 251 | |
| 252 | return 0; |
| 253 | } |
| 254 | |
Jakub Kicinski | 25415ce | 2017-11-27 11:11:41 -0800 | [diff] [blame] | 255 | static void cls_bpf_free_parms(struct cls_bpf_prog *prog) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 256 | { |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 257 | if (cls_bpf_is_ebpf(prog)) |
| 258 | bpf_prog_put(prog->filter); |
| 259 | else |
| 260 | bpf_prog_destroy(prog->filter); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 261 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 262 | kfree(prog->bpf_name); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 263 | kfree(prog->bpf_ops); |
Jakub Kicinski | 25415ce | 2017-11-27 11:11:41 -0800 | [diff] [blame] | 264 | } |
| 265 | |
| 266 | static void __cls_bpf_delete_prog(struct cls_bpf_prog *prog) |
| 267 | { |
| 268 | tcf_exts_destroy(&prog->exts); |
| 269 | tcf_exts_put_net(&prog->exts); |
| 270 | |
| 271 | cls_bpf_free_parms(prog); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 272 | kfree(prog); |
| 273 | } |
| 274 | |
Cong Wang | e910af6 | 2017-10-26 18:24:30 -0700 | [diff] [blame] | 275 | static void cls_bpf_delete_prog_work(struct work_struct *work) |
| 276 | { |
Cong Wang | aaa908f | 2018-05-23 15:26:53 -0700 | [diff] [blame] | 277 | struct cls_bpf_prog *prog = container_of(to_rcu_work(work), |
| 278 | struct cls_bpf_prog, |
| 279 | rwork); |
Cong Wang | e910af6 | 2017-10-26 18:24:30 -0700 | [diff] [blame] | 280 | rtnl_lock(); |
| 281 | __cls_bpf_delete_prog(prog); |
| 282 | rtnl_unlock(); |
| 283 | } |
| 284 | |
Jakub Kicinski | 0e908a4 | 2018-01-24 12:54:17 -0800 | [diff] [blame] | 285 | static void __cls_bpf_delete(struct tcf_proto *tp, struct cls_bpf_prog *prog, |
| 286 | struct netlink_ext_ack *extack) |
Daniel Borkmann | 8d829bd | 2016-12-04 23:19:40 +0100 | [diff] [blame] | 287 | { |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 288 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
| 289 | |
Matthew Wilcox | 9c16094 | 2017-11-28 09:48:43 -0500 | [diff] [blame] | 290 | idr_remove(&head->handle_idr, prog->handle); |
Jakub Kicinski | 0e908a4 | 2018-01-24 12:54:17 -0800 | [diff] [blame] | 291 | cls_bpf_stop_offload(tp, prog, extack); |
Daniel Borkmann | 8d829bd | 2016-12-04 23:19:40 +0100 | [diff] [blame] | 292 | list_del_rcu(&prog->link); |
| 293 | tcf_unbind_filter(tp, &prog->res); |
Cong Wang | aae2c35 | 2017-11-06 13:47:21 -0800 | [diff] [blame] | 294 | if (tcf_exts_get_net(&prog->exts)) |
Cong Wang | aaa908f | 2018-05-23 15:26:53 -0700 | [diff] [blame] | 295 | tcf_queue_work(&prog->rwork, cls_bpf_delete_prog_work); |
Cong Wang | aae2c35 | 2017-11-06 13:47:21 -0800 | [diff] [blame] | 296 | else |
| 297 | __cls_bpf_delete_prog(prog); |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 298 | } |
| 299 | |
Alexander Aring | 571acf2 | 2018-01-18 11:20:53 -0500 | [diff] [blame] | 300 | static int cls_bpf_delete(struct tcf_proto *tp, void *arg, bool *last, |
| 301 | struct netlink_ext_ack *extack) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 302 | { |
WANG Cong | 763dbf6 | 2017-04-19 14:21:21 -0700 | [diff] [blame] | 303 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
| 304 | |
Jakub Kicinski | 0e908a4 | 2018-01-24 12:54:17 -0800 | [diff] [blame] | 305 | __cls_bpf_delete(tp, arg, extack); |
WANG Cong | 763dbf6 | 2017-04-19 14:21:21 -0700 | [diff] [blame] | 306 | *last = list_empty(&head->plist); |
Jiri Pirko | 472f583 | 2014-12-02 18:00:32 +0100 | [diff] [blame] | 307 | return 0; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 308 | } |
| 309 | |
Jakub Kicinski | 715df5e | 2018-01-24 12:54:13 -0800 | [diff] [blame] | 310 | static void cls_bpf_destroy(struct tcf_proto *tp, |
| 311 | struct netlink_ext_ack *extack) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 312 | { |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 313 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 314 | struct cls_bpf_prog *prog, *tmp; |
| 315 | |
Daniel Borkmann | 8d829bd | 2016-12-04 23:19:40 +0100 | [diff] [blame] | 316 | list_for_each_entry_safe(prog, tmp, &head->plist, link) |
Jakub Kicinski | 0e908a4 | 2018-01-24 12:54:17 -0800 | [diff] [blame] | 317 | __cls_bpf_delete(tp, prog, extack); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 318 | |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 319 | idr_destroy(&head->handle_idr); |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 320 | kfree_rcu(head, rcu); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 321 | } |
| 322 | |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 323 | static void *cls_bpf_get(struct tcf_proto *tp, u32 handle) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 324 | { |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 325 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 326 | struct cls_bpf_prog *prog; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 327 | |
Jiri Pirko | 3fe6b49 | 2014-12-02 18:00:33 +0100 | [diff] [blame] | 328 | list_for_each_entry(prog, &head->plist, link) { |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 329 | if (prog->handle == handle) |
| 330 | return prog; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 331 | } |
| 332 | |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 333 | return NULL; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 334 | } |
| 335 | |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 336 | static int cls_bpf_prog_from_ops(struct nlattr **tb, struct cls_bpf_prog *prog) |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 337 | { |
| 338 | struct sock_filter *bpf_ops; |
| 339 | struct sock_fprog_kern fprog_tmp; |
| 340 | struct bpf_prog *fp; |
| 341 | u16 bpf_size, bpf_num_ops; |
| 342 | int ret; |
| 343 | |
| 344 | bpf_num_ops = nla_get_u16(tb[TCA_BPF_OPS_LEN]); |
| 345 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
| 346 | return -EINVAL; |
| 347 | |
| 348 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
| 349 | if (bpf_size != nla_len(tb[TCA_BPF_OPS])) |
| 350 | return -EINVAL; |
| 351 | |
YueHaibing | f9562fa | 2018-07-28 18:35:15 +0800 | [diff] [blame] | 352 | bpf_ops = kmemdup(nla_data(tb[TCA_BPF_OPS]), bpf_size, GFP_KERNEL); |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 353 | if (bpf_ops == NULL) |
| 354 | return -ENOMEM; |
| 355 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 356 | fprog_tmp.len = bpf_num_ops; |
| 357 | fprog_tmp.filter = bpf_ops; |
| 358 | |
| 359 | ret = bpf_prog_create(&fp, &fprog_tmp); |
| 360 | if (ret < 0) { |
| 361 | kfree(bpf_ops); |
| 362 | return ret; |
| 363 | } |
| 364 | |
| 365 | prog->bpf_ops = bpf_ops; |
| 366 | prog->bpf_num_ops = bpf_num_ops; |
| 367 | prog->bpf_name = NULL; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 368 | prog->filter = fp; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 369 | |
| 370 | return 0; |
| 371 | } |
| 372 | |
Daniel Borkmann | c46646d | 2015-09-30 01:41:51 +0200 | [diff] [blame] | 373 | static int cls_bpf_prog_from_efd(struct nlattr **tb, struct cls_bpf_prog *prog, |
Jakub Kicinski | 6c8dfe2 | 2017-11-03 13:56:21 -0700 | [diff] [blame] | 374 | u32 gen_flags, const struct tcf_proto *tp) |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 375 | { |
| 376 | struct bpf_prog *fp; |
| 377 | char *name = NULL; |
Jakub Kicinski | 288b3de | 2017-11-20 15:21:54 -0800 | [diff] [blame] | 378 | bool skip_sw; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 379 | u32 bpf_fd; |
| 380 | |
| 381 | bpf_fd = nla_get_u32(tb[TCA_BPF_FD]); |
Jakub Kicinski | 288b3de | 2017-11-20 15:21:54 -0800 | [diff] [blame] | 382 | skip_sw = gen_flags & TCA_CLS_FLAGS_SKIP_SW; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 383 | |
Jakub Kicinski | 288b3de | 2017-11-20 15:21:54 -0800 | [diff] [blame] | 384 | fp = bpf_prog_get_type_dev(bpf_fd, BPF_PROG_TYPE_SCHED_CLS, skip_sw); |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 385 | if (IS_ERR(fp)) |
| 386 | return PTR_ERR(fp); |
| 387 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 388 | if (tb[TCA_BPF_NAME]) { |
Thomas Graf | b15ca18 | 2016-10-26 10:53:16 +0200 | [diff] [blame] | 389 | name = nla_memdup(tb[TCA_BPF_NAME], GFP_KERNEL); |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 390 | if (!name) { |
| 391 | bpf_prog_put(fp); |
| 392 | return -ENOMEM; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | prog->bpf_ops = NULL; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 397 | prog->bpf_name = name; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 398 | prog->filter = fp; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 399 | |
Jiri Pirko | f36fe1c | 2018-01-17 11:46:48 +0100 | [diff] [blame] | 400 | if (fp->dst_needed) |
| 401 | tcf_block_netif_keep_dst(tp->chain->block); |
Daniel Borkmann | c46646d | 2015-09-30 01:41:51 +0200 | [diff] [blame] | 402 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 403 | return 0; |
| 404 | } |
| 405 | |
Jiri Pirko | 6a725c4 | 2017-08-04 14:29:04 +0200 | [diff] [blame] | 406 | static int cls_bpf_set_parms(struct net *net, struct tcf_proto *tp, |
| 407 | struct cls_bpf_prog *prog, unsigned long base, |
Alexander Aring | 50a5619 | 2018-01-18 11:20:52 -0500 | [diff] [blame] | 408 | struct nlattr **tb, struct nlattr *est, bool ovr, |
| 409 | struct netlink_ext_ack *extack) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 410 | { |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 411 | bool is_bpf, is_ebpf, have_exts = false; |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 412 | u32 gen_flags = 0; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 413 | int ret; |
| 414 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 415 | is_bpf = tb[TCA_BPF_OPS_LEN] && tb[TCA_BPF_OPS]; |
| 416 | is_ebpf = tb[TCA_BPF_FD]; |
Daniel Borkmann | ef146fa | 2015-09-23 21:56:47 +0200 | [diff] [blame] | 417 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 418 | return -EINVAL; |
| 419 | |
Alexander Aring | 50a5619 | 2018-01-18 11:20:52 -0500 | [diff] [blame] | 420 | ret = tcf_exts_validate(net, tp, tb, est, &prog->exts, ovr, extack); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 421 | if (ret < 0) |
| 422 | return ret; |
| 423 | |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 424 | if (tb[TCA_BPF_FLAGS]) { |
| 425 | u32 bpf_flags = nla_get_u32(tb[TCA_BPF_FLAGS]); |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 426 | |
Jiri Pirko | 6839da3 | 2017-08-04 14:29:10 +0200 | [diff] [blame] | 427 | if (bpf_flags & ~TCA_BPF_FLAG_ACT_DIRECT) |
| 428 | return -EINVAL; |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 429 | |
| 430 | have_exts = bpf_flags & TCA_BPF_FLAG_ACT_DIRECT; |
| 431 | } |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 432 | if (tb[TCA_BPF_FLAGS_GEN]) { |
| 433 | gen_flags = nla_get_u32(tb[TCA_BPF_FLAGS_GEN]); |
| 434 | if (gen_flags & ~CLS_BPF_SUPPORTED_GEN_FLAGS || |
Jiri Pirko | 6839da3 | 2017-08-04 14:29:10 +0200 | [diff] [blame] | 435 | !tc_flags_valid(gen_flags)) |
| 436 | return -EINVAL; |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 437 | } |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 438 | |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 439 | prog->exts_integrated = have_exts; |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 440 | prog->gen_flags = gen_flags; |
Daniel Borkmann | 045efa8 | 2015-09-15 23:05:42 -0700 | [diff] [blame] | 441 | |
| 442 | ret = is_bpf ? cls_bpf_prog_from_ops(tb, prog) : |
Jakub Kicinski | 6c8dfe2 | 2017-11-03 13:56:21 -0700 | [diff] [blame] | 443 | cls_bpf_prog_from_efd(tb, prog, gen_flags, tp); |
WANG Cong | b9a24bb | 2016-08-19 12:36:54 -0700 | [diff] [blame] | 444 | if (ret < 0) |
Jiri Pirko | 6839da3 | 2017-08-04 14:29:10 +0200 | [diff] [blame] | 445 | return ret; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 446 | |
Daniel Borkmann | ef146fa | 2015-09-23 21:56:47 +0200 | [diff] [blame] | 447 | if (tb[TCA_BPF_CLASSID]) { |
| 448 | prog->res.classid = nla_get_u32(tb[TCA_BPF_CLASSID]); |
| 449 | tcf_bind_filter(tp, &prog->res, base); |
| 450 | } |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 451 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 452 | return 0; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 453 | } |
| 454 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 455 | static int cls_bpf_change(struct net *net, struct sk_buff *in_skb, |
| 456 | struct tcf_proto *tp, unsigned long base, |
| 457 | u32 handle, struct nlattr **tca, |
Alexander Aring | 7306db3 | 2018-01-18 11:20:51 -0500 | [diff] [blame] | 458 | void **arg, bool ovr, struct netlink_ext_ack *extack) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 459 | { |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 460 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 461 | struct cls_bpf_prog *oldprog = *arg; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 462 | struct nlattr *tb[TCA_BPF_MAX + 1]; |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 463 | struct cls_bpf_prog *prog; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 464 | int ret; |
| 465 | |
| 466 | if (tca[TCA_OPTIONS] == NULL) |
| 467 | return -EINVAL; |
| 468 | |
Johannes Berg | fceb643 | 2017-04-12 14:34:07 +0200 | [diff] [blame] | 469 | ret = nla_parse_nested(tb, TCA_BPF_MAX, tca[TCA_OPTIONS], bpf_policy, |
| 470 | NULL); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 471 | if (ret < 0) |
| 472 | return ret; |
| 473 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 474 | prog = kzalloc(sizeof(*prog), GFP_KERNEL); |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 475 | if (!prog) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 476 | return -ENOBUFS; |
| 477 | |
WANG Cong | b9a24bb | 2016-08-19 12:36:54 -0700 | [diff] [blame] | 478 | ret = tcf_exts_init(&prog->exts, TCA_BPF_ACT, TCA_BPF_POLICE); |
| 479 | if (ret < 0) |
| 480 | goto errout; |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 481 | |
| 482 | if (oldprog) { |
| 483 | if (handle && oldprog->handle != handle) { |
| 484 | ret = -EINVAL; |
| 485 | goto errout; |
| 486 | } |
| 487 | } |
| 488 | |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 489 | if (handle == 0) { |
Matthew Wilcox | 0b4ce8d | 2017-11-28 10:46:29 -0500 | [diff] [blame] | 490 | handle = 1; |
| 491 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, |
| 492 | INT_MAX, GFP_KERNEL); |
| 493 | } else if (!oldprog) { |
| 494 | ret = idr_alloc_u32(&head->handle_idr, prog, &handle, |
| 495 | handle, GFP_KERNEL); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 496 | } |
| 497 | |
Matthew Wilcox | 0b4ce8d | 2017-11-28 10:46:29 -0500 | [diff] [blame] | 498 | if (ret) |
| 499 | goto errout; |
| 500 | prog->handle = handle; |
| 501 | |
Alexander Aring | 50a5619 | 2018-01-18 11:20:52 -0500 | [diff] [blame] | 502 | ret = cls_bpf_set_parms(net, tp, prog, base, tb, tca[TCA_RATE], ovr, |
| 503 | extack); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 504 | if (ret < 0) |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 505 | goto errout_idr; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 506 | |
Quentin Monnet | 631f65f | 2018-01-19 17:44:46 -0800 | [diff] [blame] | 507 | ret = cls_bpf_offload(tp, prog, oldprog, extack); |
Jakub Kicinski | 25415ce | 2017-11-27 11:11:41 -0800 | [diff] [blame] | 508 | if (ret) |
| 509 | goto errout_parms; |
Jakub Kicinski | 332ae8e | 2016-09-21 11:43:53 +0100 | [diff] [blame] | 510 | |
Or Gerlitz | 5cecb6c | 2017-02-16 10:31:16 +0200 | [diff] [blame] | 511 | if (!tc_in_hw(prog->gen_flags)) |
| 512 | prog->gen_flags |= TCA_CLS_FLAGS_NOT_IN_HW; |
| 513 | |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 514 | if (oldprog) { |
Matthew Wilcox | 234a462 | 2017-11-28 09:56:36 -0500 | [diff] [blame] | 515 | idr_replace(&head->handle_idr, prog, handle); |
Daniel Borkmann | f6bfc46 | 2015-07-17 22:38:43 +0200 | [diff] [blame] | 516 | list_replace_rcu(&oldprog->link, &prog->link); |
John Fastabend | 18cdb37 | 2014-10-05 21:28:52 -0700 | [diff] [blame] | 517 | tcf_unbind_filter(tp, &oldprog->res); |
Cong Wang | aae2c35 | 2017-11-06 13:47:21 -0800 | [diff] [blame] | 518 | tcf_exts_get_net(&oldprog->exts); |
Cong Wang | aaa908f | 2018-05-23 15:26:53 -0700 | [diff] [blame] | 519 | tcf_queue_work(&oldprog->rwork, cls_bpf_delete_prog_work); |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 520 | } else { |
| 521 | list_add_rcu(&prog->link, &head->plist); |
| 522 | } |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 523 | |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 524 | *arg = prog; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 525 | return 0; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 526 | |
Jakub Kicinski | 25415ce | 2017-11-27 11:11:41 -0800 | [diff] [blame] | 527 | errout_parms: |
| 528 | cls_bpf_free_parms(prog); |
Cong Wang | 76cf546 | 2017-09-25 10:13:49 -0700 | [diff] [blame] | 529 | errout_idr: |
| 530 | if (!oldprog) |
Matthew Wilcox | 9c16094 | 2017-11-28 09:48:43 -0500 | [diff] [blame] | 531 | idr_remove(&head->handle_idr, prog->handle); |
WANG Cong | b9a24bb | 2016-08-19 12:36:54 -0700 | [diff] [blame] | 532 | errout: |
| 533 | tcf_exts_destroy(&prog->exts); |
| 534 | kfree(prog); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 535 | return ret; |
| 536 | } |
| 537 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 538 | static int cls_bpf_dump_bpf_info(const struct cls_bpf_prog *prog, |
| 539 | struct sk_buff *skb) |
| 540 | { |
| 541 | struct nlattr *nla; |
| 542 | |
| 543 | if (nla_put_u16(skb, TCA_BPF_OPS_LEN, prog->bpf_num_ops)) |
| 544 | return -EMSGSIZE; |
| 545 | |
| 546 | nla = nla_reserve(skb, TCA_BPF_OPS, prog->bpf_num_ops * |
| 547 | sizeof(struct sock_filter)); |
| 548 | if (nla == NULL) |
| 549 | return -EMSGSIZE; |
| 550 | |
| 551 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); |
| 552 | |
| 553 | return 0; |
| 554 | } |
| 555 | |
| 556 | static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog, |
| 557 | struct sk_buff *skb) |
| 558 | { |
Daniel Borkmann | 7bd509e | 2016-12-04 23:19:41 +0100 | [diff] [blame] | 559 | struct nlattr *nla; |
| 560 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 561 | if (prog->bpf_name && |
| 562 | nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name)) |
| 563 | return -EMSGSIZE; |
| 564 | |
Daniel Borkmann | e862830 | 2017-06-21 20:16:11 +0200 | [diff] [blame] | 565 | if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id)) |
| 566 | return -EMSGSIZE; |
| 567 | |
Daniel Borkmann | f1f7714 | 2017-01-13 23:38:15 +0100 | [diff] [blame] | 568 | nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag)); |
Daniel Borkmann | 7bd509e | 2016-12-04 23:19:41 +0100 | [diff] [blame] | 569 | if (nla == NULL) |
| 570 | return -EMSGSIZE; |
| 571 | |
Daniel Borkmann | f1f7714 | 2017-01-13 23:38:15 +0100 | [diff] [blame] | 572 | memcpy(nla_data(nla), prog->filter->tag, nla_len(nla)); |
Daniel Borkmann | 7bd509e | 2016-12-04 23:19:41 +0100 | [diff] [blame] | 573 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 574 | return 0; |
| 575 | } |
| 576 | |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 577 | static int cls_bpf_dump(struct net *net, struct tcf_proto *tp, void *fh, |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 578 | struct sk_buff *skb, struct tcmsg *tm) |
| 579 | { |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 580 | struct cls_bpf_prog *prog = fh; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 581 | struct nlattr *nest; |
Daniel Borkmann | bf007d1 | 2015-09-23 21:56:46 +0200 | [diff] [blame] | 582 | u32 bpf_flags = 0; |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 583 | int ret; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 584 | |
| 585 | if (prog == NULL) |
| 586 | return skb->len; |
| 587 | |
| 588 | tm->tcm_handle = prog->handle; |
| 589 | |
Jakub Kicinski | 68d6406 | 2016-09-21 11:44:02 +0100 | [diff] [blame] | 590 | cls_bpf_offload_update_stats(tp, prog); |
| 591 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 592 | nest = nla_nest_start(skb, TCA_OPTIONS); |
| 593 | if (nest == NULL) |
| 594 | goto nla_put_failure; |
| 595 | |
Daniel Borkmann | ef146fa | 2015-09-23 21:56:47 +0200 | [diff] [blame] | 596 | if (prog->res.classid && |
| 597 | nla_put_u32(skb, TCA_BPF_CLASSID, prog->res.classid)) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 598 | goto nla_put_failure; |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 599 | |
Daniel Borkmann | e2e9b65 | 2015-03-01 12:31:48 +0100 | [diff] [blame] | 600 | if (cls_bpf_is_ebpf(prog)) |
| 601 | ret = cls_bpf_dump_ebpf_info(prog, skb); |
| 602 | else |
| 603 | ret = cls_bpf_dump_bpf_info(prog, skb); |
| 604 | if (ret) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 605 | goto nla_put_failure; |
| 606 | |
WANG Cong | 5da57f4 | 2013-12-15 20:15:07 -0800 | [diff] [blame] | 607 | if (tcf_exts_dump(skb, &prog->exts) < 0) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 608 | goto nla_put_failure; |
| 609 | |
Daniel Borkmann | bf007d1 | 2015-09-23 21:56:46 +0200 | [diff] [blame] | 610 | if (prog->exts_integrated) |
| 611 | bpf_flags |= TCA_BPF_FLAG_ACT_DIRECT; |
| 612 | if (bpf_flags && nla_put_u32(skb, TCA_BPF_FLAGS, bpf_flags)) |
| 613 | goto nla_put_failure; |
Jakub Kicinski | 0d01d45 | 2016-09-21 11:43:54 +0100 | [diff] [blame] | 614 | if (prog->gen_flags && |
| 615 | nla_put_u32(skb, TCA_BPF_FLAGS_GEN, prog->gen_flags)) |
| 616 | goto nla_put_failure; |
Daniel Borkmann | bf007d1 | 2015-09-23 21:56:46 +0200 | [diff] [blame] | 617 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 618 | nla_nest_end(skb, nest); |
| 619 | |
WANG Cong | 5da57f4 | 2013-12-15 20:15:07 -0800 | [diff] [blame] | 620 | if (tcf_exts_dump_stats(skb, &prog->exts) < 0) |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 621 | goto nla_put_failure; |
| 622 | |
| 623 | return skb->len; |
| 624 | |
| 625 | nla_put_failure: |
| 626 | nla_nest_cancel(skb, nest); |
| 627 | return -1; |
| 628 | } |
| 629 | |
Cong Wang | 9f7a328 | 2020-01-23 16:26:18 -0800 | [diff] [blame] | 630 | static void cls_bpf_bind_class(void *fh, u32 classid, unsigned long cl, |
| 631 | void *q, unsigned long base) |
Cong Wang | 07d79fc | 2017-08-30 14:30:36 -0700 | [diff] [blame] | 632 | { |
| 633 | struct cls_bpf_prog *prog = fh; |
| 634 | |
Cong Wang | 9f7a328 | 2020-01-23 16:26:18 -0800 | [diff] [blame] | 635 | if (prog && prog->res.classid == classid) { |
| 636 | if (cl) |
| 637 | __tcf_bind_filter(q, &prog->res, base); |
| 638 | else |
| 639 | __tcf_unbind_filter(q, &prog->res); |
| 640 | } |
Cong Wang | 07d79fc | 2017-08-30 14:30:36 -0700 | [diff] [blame] | 641 | } |
| 642 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 643 | static void cls_bpf_walk(struct tcf_proto *tp, struct tcf_walker *arg) |
| 644 | { |
John Fastabend | 1f947bf | 2014-09-12 20:10:24 -0700 | [diff] [blame] | 645 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 646 | struct cls_bpf_prog *prog; |
| 647 | |
Jiri Pirko | 3fe6b49 | 2014-12-02 18:00:33 +0100 | [diff] [blame] | 648 | list_for_each_entry(prog, &head->plist, link) { |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 649 | if (arg->count < arg->skip) |
| 650 | goto skip; |
WANG Cong | 8113c09 | 2017-08-04 21:31:43 -0700 | [diff] [blame] | 651 | if (arg->fn(tp, prog, arg) < 0) { |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 652 | arg->stop = 1; |
| 653 | break; |
| 654 | } |
| 655 | skip: |
| 656 | arg->count++; |
| 657 | } |
| 658 | } |
| 659 | |
John Hurley | 7e916b7 | 2018-06-25 14:30:09 -0700 | [diff] [blame] | 660 | static int cls_bpf_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb, |
| 661 | void *cb_priv, struct netlink_ext_ack *extack) |
| 662 | { |
| 663 | struct cls_bpf_head *head = rtnl_dereference(tp->root); |
| 664 | struct tcf_block *block = tp->chain->block; |
| 665 | struct tc_cls_bpf_offload cls_bpf = {}; |
| 666 | struct cls_bpf_prog *prog; |
| 667 | int err; |
| 668 | |
| 669 | list_for_each_entry(prog, &head->plist, link) { |
| 670 | if (tc_skip_hw(prog->gen_flags)) |
| 671 | continue; |
| 672 | |
| 673 | tc_cls_common_offload_init(&cls_bpf.common, tp, prog->gen_flags, |
| 674 | extack); |
| 675 | cls_bpf.command = TC_CLSBPF_OFFLOAD; |
| 676 | cls_bpf.exts = &prog->exts; |
| 677 | cls_bpf.prog = add ? prog->filter : NULL; |
| 678 | cls_bpf.oldprog = add ? NULL : prog->filter; |
| 679 | cls_bpf.name = prog->bpf_name; |
| 680 | cls_bpf.exts_integrated = prog->exts_integrated; |
| 681 | |
| 682 | err = cb(TC_SETUP_CLSBPF, &cls_bpf, cb_priv); |
| 683 | if (err) { |
| 684 | if (add && tc_skip_sw(prog->gen_flags)) |
| 685 | return err; |
| 686 | continue; |
| 687 | } |
| 688 | |
| 689 | tc_cls_offload_cnt_update(block, &prog->in_hw_count, |
| 690 | &prog->gen_flags, add); |
| 691 | } |
| 692 | |
| 693 | return 0; |
| 694 | } |
| 695 | |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 696 | static struct tcf_proto_ops cls_bpf_ops __read_mostly = { |
| 697 | .kind = "bpf", |
| 698 | .owner = THIS_MODULE, |
| 699 | .classify = cls_bpf_classify, |
| 700 | .init = cls_bpf_init, |
| 701 | .destroy = cls_bpf_destroy, |
| 702 | .get = cls_bpf_get, |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 703 | .change = cls_bpf_change, |
| 704 | .delete = cls_bpf_delete, |
| 705 | .walk = cls_bpf_walk, |
John Hurley | 7e916b7 | 2018-06-25 14:30:09 -0700 | [diff] [blame] | 706 | .reoffload = cls_bpf_reoffload, |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 707 | .dump = cls_bpf_dump, |
Cong Wang | 07d79fc | 2017-08-30 14:30:36 -0700 | [diff] [blame] | 708 | .bind_class = cls_bpf_bind_class, |
Daniel Borkmann | 7d1d65c | 2013-10-28 16:43:02 +0100 | [diff] [blame] | 709 | }; |
| 710 | |
| 711 | static int __init cls_bpf_init_mod(void) |
| 712 | { |
| 713 | return register_tcf_proto_ops(&cls_bpf_ops); |
| 714 | } |
| 715 | |
| 716 | static void __exit cls_bpf_exit_mod(void) |
| 717 | { |
| 718 | unregister_tcf_proto_ops(&cls_bpf_ops); |
| 719 | } |
| 720 | |
| 721 | module_init(cls_bpf_init_mod); |
| 722 | module_exit(cls_bpf_exit_mod); |