Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2015 Jiri Pirko <jiri@resnulli.us> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/module.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/kernel.h> |
| 13 | #include <linux/skbuff.h> |
| 14 | #include <linux/rtnetlink.h> |
| 15 | #include <linux/filter.h> |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 16 | #include <linux/bpf.h> |
| 17 | |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 18 | #include <net/netlink.h> |
| 19 | #include <net/pkt_sched.h> |
| 20 | |
| 21 | #include <linux/tc_act/tc_bpf.h> |
| 22 | #include <net/tc_act/tc_bpf.h> |
| 23 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 24 | #define BPF_TAB_MASK 15 |
| 25 | #define ACT_BPF_NAME_LEN 256 |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 26 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 27 | struct tcf_bpf_cfg { |
| 28 | struct bpf_prog *filter; |
| 29 | struct sock_filter *bpf_ops; |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 30 | const char *bpf_name; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 31 | u32 bpf_fd; |
| 32 | u16 bpf_num_ops; |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 33 | bool is_ebpf; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 34 | }; |
| 35 | |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 36 | static int bpf_net_id; |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 37 | static struct tc_action_ops act_bpf_ops; |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 38 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 39 | static int tcf_bpf(struct sk_buff *skb, const struct tc_action *act, |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 40 | struct tcf_result *res) |
| 41 | { |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 42 | struct tcf_bpf *prog = to_bpf(act); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 43 | struct bpf_prog *filter; |
Daniel Borkmann | ced585c | 2015-03-17 20:25:57 +0100 | [diff] [blame] | 44 | int action, filter_res; |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 45 | bool at_ingress = G_TC_AT(skb->tc_verd) & AT_INGRESS; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 46 | |
Alexei Starovoitov | a166151 | 2015-04-15 12:55:45 -0700 | [diff] [blame] | 47 | if (unlikely(!skb_mac_header_was_set(skb))) |
| 48 | return TC_ACT_UNSPEC; |
| 49 | |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 50 | tcf_lastuse_update(&prog->tcf_tm); |
| 51 | bstats_cpu_update(this_cpu_ptr(prog->common.cpu_bstats), skb); |
Daniel Borkmann | ced585c | 2015-03-17 20:25:57 +0100 | [diff] [blame] | 52 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 53 | rcu_read_lock(); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 54 | filter = rcu_dereference(prog->filter); |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 55 | if (at_ingress) { |
| 56 | __skb_push(skb, skb->mac_len); |
Alexei Starovoitov | db58ba4 | 2016-05-05 19:49:12 -0700 | [diff] [blame] | 57 | bpf_compute_data_end(skb); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 58 | filter_res = BPF_PROG_RUN(filter, skb); |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 59 | __skb_pull(skb, skb->mac_len); |
| 60 | } else { |
Alexei Starovoitov | db58ba4 | 2016-05-05 19:49:12 -0700 | [diff] [blame] | 61 | bpf_compute_data_end(skb); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 62 | filter_res = BPF_PROG_RUN(filter, skb); |
Alexei Starovoitov | 3431205 | 2015-06-04 10:11:53 -0700 | [diff] [blame] | 63 | } |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 64 | rcu_read_unlock(); |
Daniel Borkmann | ced585c | 2015-03-17 20:25:57 +0100 | [diff] [blame] | 65 | |
| 66 | /* A BPF program may overwrite the default action opcode. |
| 67 | * Similarly as in cls_bpf, if filter_res == -1 we use the |
| 68 | * default action specified from tc. |
| 69 | * |
| 70 | * In case a different well-known TC_ACT opcode has been |
| 71 | * returned, it will overwrite the default one. |
| 72 | * |
| 73 | * For everything else that is unkown, TC_ACT_UNSPEC is |
| 74 | * returned. |
| 75 | */ |
| 76 | switch (filter_res) { |
| 77 | case TC_ACT_PIPE: |
| 78 | case TC_ACT_RECLASSIFY: |
| 79 | case TC_ACT_OK: |
Alexei Starovoitov | 27b29f6 | 2015-09-15 23:05:43 -0700 | [diff] [blame] | 80 | case TC_ACT_REDIRECT: |
Daniel Borkmann | ced585c | 2015-03-17 20:25:57 +0100 | [diff] [blame] | 81 | action = filter_res; |
| 82 | break; |
| 83 | case TC_ACT_SHOT: |
| 84 | action = filter_res; |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 85 | qstats_drop_inc(this_cpu_ptr(prog->common.cpu_qstats)); |
Daniel Borkmann | ced585c | 2015-03-17 20:25:57 +0100 | [diff] [blame] | 86 | break; |
| 87 | case TC_ACT_UNSPEC: |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 88 | action = prog->tcf_action; |
Daniel Borkmann | ced585c | 2015-03-17 20:25:57 +0100 | [diff] [blame] | 89 | break; |
| 90 | default: |
| 91 | action = TC_ACT_UNSPEC; |
| 92 | break; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 93 | } |
| 94 | |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 95 | return action; |
| 96 | } |
| 97 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 98 | static bool tcf_bpf_is_ebpf(const struct tcf_bpf *prog) |
| 99 | { |
| 100 | return !prog->bpf_ops; |
| 101 | } |
| 102 | |
| 103 | static int tcf_bpf_dump_bpf_info(const struct tcf_bpf *prog, |
| 104 | struct sk_buff *skb) |
| 105 | { |
| 106 | struct nlattr *nla; |
| 107 | |
| 108 | if (nla_put_u16(skb, TCA_ACT_BPF_OPS_LEN, prog->bpf_num_ops)) |
| 109 | return -EMSGSIZE; |
| 110 | |
| 111 | nla = nla_reserve(skb, TCA_ACT_BPF_OPS, prog->bpf_num_ops * |
| 112 | sizeof(struct sock_filter)); |
| 113 | if (nla == NULL) |
| 114 | return -EMSGSIZE; |
| 115 | |
| 116 | memcpy(nla_data(nla), prog->bpf_ops, nla_len(nla)); |
| 117 | |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | static int tcf_bpf_dump_ebpf_info(const struct tcf_bpf *prog, |
| 122 | struct sk_buff *skb) |
| 123 | { |
| 124 | if (nla_put_u32(skb, TCA_ACT_BPF_FD, prog->bpf_fd)) |
| 125 | return -EMSGSIZE; |
| 126 | |
| 127 | if (prog->bpf_name && |
| 128 | nla_put_string(skb, TCA_ACT_BPF_NAME, prog->bpf_name)) |
| 129 | return -EMSGSIZE; |
| 130 | |
| 131 | return 0; |
| 132 | } |
| 133 | |
| 134 | static int tcf_bpf_dump(struct sk_buff *skb, struct tc_action *act, |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 135 | int bind, int ref) |
| 136 | { |
| 137 | unsigned char *tp = skb_tail_pointer(skb); |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 138 | struct tcf_bpf *prog = to_bpf(act); |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 139 | struct tc_act_bpf opt = { |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 140 | .index = prog->tcf_index, |
| 141 | .refcnt = prog->tcf_refcnt - ref, |
| 142 | .bindcnt = prog->tcf_bindcnt - bind, |
| 143 | .action = prog->tcf_action, |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 144 | }; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 145 | struct tcf_t tm; |
| 146 | int ret; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 147 | |
| 148 | if (nla_put(skb, TCA_ACT_BPF_PARMS, sizeof(opt), &opt)) |
| 149 | goto nla_put_failure; |
| 150 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 151 | if (tcf_bpf_is_ebpf(prog)) |
| 152 | ret = tcf_bpf_dump_ebpf_info(prog, skb); |
| 153 | else |
| 154 | ret = tcf_bpf_dump_bpf_info(prog, skb); |
| 155 | if (ret) |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 156 | goto nla_put_failure; |
| 157 | |
Jamal Hadi Salim | 48d8ee1 | 2016-06-06 06:32:55 -0400 | [diff] [blame] | 158 | tcf_tm_dump(&tm, &prog->tcf_tm); |
Nicolas Dichtel | 9854518 | 2016-04-26 10:06:18 +0200 | [diff] [blame] | 159 | if (nla_put_64bit(skb, TCA_ACT_BPF_TM, sizeof(tm), &tm, |
| 160 | TCA_ACT_BPF_PAD)) |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 161 | goto nla_put_failure; |
| 162 | |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 163 | return skb->len; |
| 164 | |
| 165 | nla_put_failure: |
| 166 | nlmsg_trim(skb, tp); |
| 167 | return -1; |
| 168 | } |
| 169 | |
| 170 | static const struct nla_policy act_bpf_policy[TCA_ACT_BPF_MAX + 1] = { |
| 171 | [TCA_ACT_BPF_PARMS] = { .len = sizeof(struct tc_act_bpf) }, |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 172 | [TCA_ACT_BPF_FD] = { .type = NLA_U32 }, |
Jamal Hadi Salim | 0b0f43f | 2016-06-05 10:41:32 -0400 | [diff] [blame] | 173 | [TCA_ACT_BPF_NAME] = { .type = NLA_NUL_STRING, |
| 174 | .len = ACT_BPF_NAME_LEN }, |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 175 | [TCA_ACT_BPF_OPS_LEN] = { .type = NLA_U16 }, |
| 176 | [TCA_ACT_BPF_OPS] = { .type = NLA_BINARY, |
| 177 | .len = sizeof(struct sock_filter) * BPF_MAXINSNS }, |
| 178 | }; |
| 179 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 180 | static int tcf_bpf_init_from_ops(struct nlattr **tb, struct tcf_bpf_cfg *cfg) |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 181 | { |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 182 | struct sock_filter *bpf_ops; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 183 | struct sock_fprog_kern fprog_tmp; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 184 | struct bpf_prog *fp; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 185 | u16 bpf_size, bpf_num_ops; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 186 | int ret; |
| 187 | |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 188 | bpf_num_ops = nla_get_u16(tb[TCA_ACT_BPF_OPS_LEN]); |
| 189 | if (bpf_num_ops > BPF_MAXINSNS || bpf_num_ops == 0) |
| 190 | return -EINVAL; |
| 191 | |
| 192 | bpf_size = bpf_num_ops * sizeof(*bpf_ops); |
Daniel Borkmann | fd3e646 | 2015-01-22 10:58:19 +0100 | [diff] [blame] | 193 | if (bpf_size != nla_len(tb[TCA_ACT_BPF_OPS])) |
| 194 | return -EINVAL; |
| 195 | |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 196 | bpf_ops = kzalloc(bpf_size, GFP_KERNEL); |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 197 | if (bpf_ops == NULL) |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 198 | return -ENOMEM; |
| 199 | |
| 200 | memcpy(bpf_ops, nla_data(tb[TCA_ACT_BPF_OPS]), bpf_size); |
| 201 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 202 | fprog_tmp.len = bpf_num_ops; |
| 203 | fprog_tmp.filter = bpf_ops; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 204 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 205 | ret = bpf_prog_create(&fp, &fprog_tmp); |
| 206 | if (ret < 0) { |
| 207 | kfree(bpf_ops); |
| 208 | return ret; |
| 209 | } |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 210 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 211 | cfg->bpf_ops = bpf_ops; |
| 212 | cfg->bpf_num_ops = bpf_num_ops; |
| 213 | cfg->filter = fp; |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 214 | cfg->is_ebpf = false; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 215 | |
| 216 | return 0; |
| 217 | } |
| 218 | |
| 219 | static int tcf_bpf_init_from_efd(struct nlattr **tb, struct tcf_bpf_cfg *cfg) |
| 220 | { |
| 221 | struct bpf_prog *fp; |
| 222 | char *name = NULL; |
| 223 | u32 bpf_fd; |
| 224 | |
| 225 | bpf_fd = nla_get_u32(tb[TCA_ACT_BPF_FD]); |
| 226 | |
Daniel Borkmann | 113214b | 2016-06-30 17:24:44 +0200 | [diff] [blame] | 227 | fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_ACT); |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 228 | if (IS_ERR(fp)) |
| 229 | return PTR_ERR(fp); |
| 230 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 231 | if (tb[TCA_ACT_BPF_NAME]) { |
| 232 | name = kmemdup(nla_data(tb[TCA_ACT_BPF_NAME]), |
| 233 | nla_len(tb[TCA_ACT_BPF_NAME]), |
| 234 | GFP_KERNEL); |
| 235 | if (!name) { |
| 236 | bpf_prog_put(fp); |
| 237 | return -ENOMEM; |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | cfg->bpf_fd = bpf_fd; |
| 242 | cfg->bpf_name = name; |
| 243 | cfg->filter = fp; |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 244 | cfg->is_ebpf = true; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 245 | |
| 246 | return 0; |
| 247 | } |
| 248 | |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 249 | static void tcf_bpf_cfg_cleanup(const struct tcf_bpf_cfg *cfg) |
| 250 | { |
| 251 | if (cfg->is_ebpf) |
| 252 | bpf_prog_put(cfg->filter); |
| 253 | else |
| 254 | bpf_prog_destroy(cfg->filter); |
| 255 | |
| 256 | kfree(cfg->bpf_ops); |
| 257 | kfree(cfg->bpf_name); |
| 258 | } |
| 259 | |
| 260 | static void tcf_bpf_prog_fill_cfg(const struct tcf_bpf *prog, |
| 261 | struct tcf_bpf_cfg *cfg) |
| 262 | { |
| 263 | cfg->is_ebpf = tcf_bpf_is_ebpf(prog); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 264 | /* updates to prog->filter are prevented, since it's called either |
| 265 | * with rtnl lock or during final cleanup in rcu callback |
| 266 | */ |
| 267 | cfg->filter = rcu_dereference_protected(prog->filter, 1); |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 268 | |
| 269 | cfg->bpf_ops = prog->bpf_ops; |
| 270 | cfg->bpf_name = prog->bpf_name; |
| 271 | } |
| 272 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 273 | static int tcf_bpf_init(struct net *net, struct nlattr *nla, |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 274 | struct nlattr *est, struct tc_action **act, |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 275 | int replace, int bind) |
| 276 | { |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 277 | struct tc_action_net *tn = net_generic(net, bpf_net_id); |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 278 | struct nlattr *tb[TCA_ACT_BPF_MAX + 1]; |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 279 | struct tcf_bpf_cfg cfg, old; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 280 | struct tc_act_bpf *parm; |
| 281 | struct tcf_bpf *prog; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 282 | bool is_bpf, is_ebpf; |
Daniel Borkmann | a5c90b2 | 2015-08-03 16:21:57 +0200 | [diff] [blame] | 283 | int ret, res = 0; |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 284 | |
| 285 | if (!nla) |
| 286 | return -EINVAL; |
| 287 | |
| 288 | ret = nla_parse_nested(tb, TCA_ACT_BPF_MAX, nla, act_bpf_policy); |
| 289 | if (ret < 0) |
| 290 | return ret; |
| 291 | |
Daniel Borkmann | a5c90b2 | 2015-08-03 16:21:57 +0200 | [diff] [blame] | 292 | if (!tb[TCA_ACT_BPF_PARMS]) |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 293 | return -EINVAL; |
| 294 | |
| 295 | parm = nla_data(tb[TCA_ACT_BPF_PARMS]); |
| 296 | |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 297 | if (!tcf_hash_check(tn, parm->index, act, bind)) { |
| 298 | ret = tcf_hash_create(tn, parm->index, est, act, |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 299 | &act_bpf_ops, bind, true); |
Daniel Borkmann | a5c90b2 | 2015-08-03 16:21:57 +0200 | [diff] [blame] | 300 | if (ret < 0) |
| 301 | return ret; |
| 302 | |
| 303 | res = ACT_P_CREATED; |
| 304 | } else { |
| 305 | /* Don't override defaults. */ |
| 306 | if (bind) |
| 307 | return 0; |
| 308 | |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 309 | tcf_hash_release(*act, bind); |
Daniel Borkmann | a5c90b2 | 2015-08-03 16:21:57 +0200 | [diff] [blame] | 310 | if (!replace) |
| 311 | return -EEXIST; |
| 312 | } |
| 313 | |
| 314 | is_bpf = tb[TCA_ACT_BPF_OPS_LEN] && tb[TCA_ACT_BPF_OPS]; |
| 315 | is_ebpf = tb[TCA_ACT_BPF_FD]; |
| 316 | |
| 317 | if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) { |
| 318 | ret = -EINVAL; |
| 319 | goto out; |
| 320 | } |
| 321 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 322 | memset(&cfg, 0, sizeof(cfg)); |
| 323 | |
| 324 | ret = is_bpf ? tcf_bpf_init_from_ops(tb, &cfg) : |
| 325 | tcf_bpf_init_from_efd(tb, &cfg); |
| 326 | if (ret < 0) |
Daniel Borkmann | a5c90b2 | 2015-08-03 16:21:57 +0200 | [diff] [blame] | 327 | goto out; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 328 | |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 329 | prog = to_bpf(*act); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 330 | ASSERT_RTNL(); |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 331 | |
Alexei Starovoitov | faa54be | 2015-08-25 20:06:32 -0700 | [diff] [blame] | 332 | if (res != ACT_P_CREATED) |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 333 | tcf_bpf_prog_fill_cfg(prog, &old); |
| 334 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 335 | prog->bpf_ops = cfg.bpf_ops; |
| 336 | prog->bpf_name = cfg.bpf_name; |
| 337 | |
| 338 | if (cfg.bpf_num_ops) |
| 339 | prog->bpf_num_ops = cfg.bpf_num_ops; |
| 340 | if (cfg.bpf_fd) |
| 341 | prog->bpf_fd = cfg.bpf_fd; |
| 342 | |
| 343 | prog->tcf_action = parm->action; |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 344 | rcu_assign_pointer(prog->filter, cfg.filter); |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 345 | |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 346 | if (res == ACT_P_CREATED) { |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 347 | tcf_hash_insert(tn, *act); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 348 | } else { |
| 349 | /* make sure the program being replaced is no longer executing */ |
| 350 | synchronize_rcu(); |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 351 | tcf_bpf_cfg_cleanup(&old); |
Alexei Starovoitov | cff8245 | 2015-08-25 20:06:35 -0700 | [diff] [blame] | 352 | } |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 353 | |
Daniel Borkmann | a5c90b2 | 2015-08-03 16:21:57 +0200 | [diff] [blame] | 354 | return res; |
| 355 | out: |
| 356 | if (res == ACT_P_CREATED) |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 357 | tcf_hash_cleanup(*act, est); |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 358 | |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 359 | return ret; |
| 360 | } |
| 361 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 362 | static void tcf_bpf_cleanup(struct tc_action *act, int bind) |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 363 | { |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 364 | struct tcf_bpf_cfg tmp; |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 365 | |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 366 | tcf_bpf_prog_fill_cfg(to_bpf(act), &tmp); |
Daniel Borkmann | f4eaed2 | 2015-07-29 18:40:56 +0200 | [diff] [blame] | 367 | tcf_bpf_cfg_cleanup(&tmp); |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 368 | } |
| 369 | |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 370 | static int tcf_bpf_walker(struct net *net, struct sk_buff *skb, |
| 371 | struct netlink_callback *cb, int type, |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 372 | const struct tc_action_ops *ops) |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 373 | { |
| 374 | struct tc_action_net *tn = net_generic(net, bpf_net_id); |
| 375 | |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 376 | return tcf_generic_walker(tn, skb, cb, type, ops); |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 377 | } |
| 378 | |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 379 | static int tcf_bpf_search(struct net *net, struct tc_action **a, u32 index) |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 380 | { |
| 381 | struct tc_action_net *tn = net_generic(net, bpf_net_id); |
| 382 | |
| 383 | return tcf_hash_search(tn, a, index); |
| 384 | } |
| 385 | |
Daniel Borkmann | a8cb5f5 | 2015-03-20 15:11:12 +0100 | [diff] [blame] | 386 | static struct tc_action_ops act_bpf_ops __read_mostly = { |
| 387 | .kind = "bpf", |
| 388 | .type = TCA_ACT_BPF, |
| 389 | .owner = THIS_MODULE, |
| 390 | .act = tcf_bpf, |
| 391 | .dump = tcf_bpf_dump, |
| 392 | .cleanup = tcf_bpf_cleanup, |
| 393 | .init = tcf_bpf_init, |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 394 | .walk = tcf_bpf_walker, |
| 395 | .lookup = tcf_bpf_search, |
WANG Cong | a85a970 | 2016-07-25 16:09:41 -0700 | [diff] [blame^] | 396 | .size = sizeof(struct tcf_bpf), |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 397 | }; |
| 398 | |
| 399 | static __net_init int bpf_init_net(struct net *net) |
| 400 | { |
| 401 | struct tc_action_net *tn = net_generic(net, bpf_net_id); |
| 402 | |
| 403 | return tc_action_net_init(tn, &act_bpf_ops, BPF_TAB_MASK); |
| 404 | } |
| 405 | |
| 406 | static void __net_exit bpf_exit_net(struct net *net) |
| 407 | { |
| 408 | struct tc_action_net *tn = net_generic(net, bpf_net_id); |
| 409 | |
| 410 | tc_action_net_exit(tn); |
| 411 | } |
| 412 | |
| 413 | static struct pernet_operations bpf_net_ops = { |
| 414 | .init = bpf_init_net, |
| 415 | .exit = bpf_exit_net, |
| 416 | .id = &bpf_net_id, |
| 417 | .size = sizeof(struct tc_action_net), |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 418 | }; |
| 419 | |
| 420 | static int __init bpf_init_module(void) |
| 421 | { |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 422 | return tcf_register_action(&act_bpf_ops, &bpf_net_ops); |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 423 | } |
| 424 | |
| 425 | static void __exit bpf_cleanup_module(void) |
| 426 | { |
WANG Cong | ddf97cc | 2016-02-22 15:57:53 -0800 | [diff] [blame] | 427 | tcf_unregister_action(&act_bpf_ops, &bpf_net_ops); |
Jiri Pirko | d23b8ad | 2015-01-15 09:52:39 +0100 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | module_init(bpf_init_module); |
| 431 | module_exit(bpf_cleanup_module); |
| 432 | |
| 433 | MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); |
| 434 | MODULE_DESCRIPTION("TC BPF based action"); |
| 435 | MODULE_LICENSE("GPL v2"); |