act_bpf.c (8c57a5e7b2820f349c95b8c8393fec1e0f4070d2) act_bpf.c (a85a970af265f156740977168b542234511b28a8)
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 */

--- 20 unchanged lines hidden (view full) ---

29 struct sock_filter *bpf_ops;
30 const char *bpf_name;
31 u32 bpf_fd;
32 u16 bpf_num_ops;
33 bool is_ebpf;
34};
35
36static int bpf_net_id;
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 */

--- 20 unchanged lines hidden (view full) ---

29 struct sock_filter *bpf_ops;
30 const char *bpf_name;
31 u32 bpf_fd;
32 u16 bpf_num_ops;
33 bool is_ebpf;
34};
35
36static int bpf_net_id;
37static struct tc_action_ops act_bpf_ops;
37
38static int tcf_bpf(struct sk_buff *skb, const struct tc_action *act,
39 struct tcf_result *res)
40{
38
39static int tcf_bpf(struct sk_buff *skb, const struct tc_action *act,
40 struct tcf_result *res)
41{
41 struct tcf_bpf *prog = act->priv;
42 struct tcf_bpf *prog = to_bpf(act);
42 struct bpf_prog *filter;
43 int action, filter_res;
44 bool at_ingress = G_TC_AT(skb->tc_verd) & AT_INGRESS;
45
46 if (unlikely(!skb_mac_header_was_set(skb)))
47 return TC_ACT_UNSPEC;
48
49 tcf_lastuse_update(&prog->tcf_tm);
50 bstats_cpu_update(this_cpu_ptr(prog->common.cpu_bstats), skb);
51
52 rcu_read_lock();
53 filter = rcu_dereference(prog->filter);
54 if (at_ingress) {
55 __skb_push(skb, skb->mac_len);
43 struct bpf_prog *filter;
44 int action, filter_res;
45 bool at_ingress = G_TC_AT(skb->tc_verd) & AT_INGRESS;
46
47 if (unlikely(!skb_mac_header_was_set(skb)))
48 return TC_ACT_UNSPEC;
49
50 tcf_lastuse_update(&prog->tcf_tm);
51 bstats_cpu_update(this_cpu_ptr(prog->common.cpu_bstats), skb);
52
53 rcu_read_lock();
54 filter = rcu_dereference(prog->filter);
55 if (at_ingress) {
56 __skb_push(skb, skb->mac_len);
57 bpf_compute_data_end(skb);
56 filter_res = BPF_PROG_RUN(filter, skb);
57 __skb_pull(skb, skb->mac_len);
58 } else {
58 filter_res = BPF_PROG_RUN(filter, skb);
59 __skb_pull(skb, skb->mac_len);
60 } else {
61 bpf_compute_data_end(skb);
59 filter_res = BPF_PROG_RUN(filter, skb);
60 }
61 rcu_read_unlock();
62
63 /* A BPF program may overwrite the default action opcode.
64 * Similarly as in cls_bpf, if filter_res == -1 we use the
65 * default action specified from tc.
66 *

--- 60 unchanged lines hidden (view full) ---

127
128 return 0;
129}
130
131static int tcf_bpf_dump(struct sk_buff *skb, struct tc_action *act,
132 int bind, int ref)
133{
134 unsigned char *tp = skb_tail_pointer(skb);
62 filter_res = BPF_PROG_RUN(filter, skb);
63 }
64 rcu_read_unlock();
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 *

--- 60 unchanged lines hidden (view full) ---

130
131 return 0;
132}
133
134static int tcf_bpf_dump(struct sk_buff *skb, struct tc_action *act,
135 int bind, int ref)
136{
137 unsigned char *tp = skb_tail_pointer(skb);
135 struct tcf_bpf *prog = act->priv;
138 struct tcf_bpf *prog = to_bpf(act);
136 struct tc_act_bpf opt = {
137 .index = prog->tcf_index,
138 .refcnt = prog->tcf_refcnt - ref,
139 .bindcnt = prog->tcf_bindcnt - bind,
140 .action = prog->tcf_action,
141 };
142 struct tcf_t tm;
143 int ret;
144
145 if (nla_put(skb, TCA_ACT_BPF_PARMS, sizeof(opt), &opt))
146 goto nla_put_failure;
147
148 if (tcf_bpf_is_ebpf(prog))
149 ret = tcf_bpf_dump_ebpf_info(prog, skb);
150 else
151 ret = tcf_bpf_dump_bpf_info(prog, skb);
152 if (ret)
153 goto nla_put_failure;
154
139 struct tc_act_bpf opt = {
140 .index = prog->tcf_index,
141 .refcnt = prog->tcf_refcnt - ref,
142 .bindcnt = prog->tcf_bindcnt - bind,
143 .action = prog->tcf_action,
144 };
145 struct tcf_t tm;
146 int ret;
147
148 if (nla_put(skb, TCA_ACT_BPF_PARMS, sizeof(opt), &opt))
149 goto nla_put_failure;
150
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)
156 goto nla_put_failure;
157
155 tm.install = jiffies_to_clock_t(jiffies - prog->tcf_tm.install);
156 tm.lastuse = jiffies_to_clock_t(jiffies - prog->tcf_tm.lastuse);
157 tm.expires = jiffies_to_clock_t(prog->tcf_tm.expires);
158
159 if (nla_put(skb, TCA_ACT_BPF_TM, sizeof(tm), &tm))
158 tcf_tm_dump(&tm, &prog->tcf_tm);
159 if (nla_put_64bit(skb, TCA_ACT_BPF_TM, sizeof(tm), &tm,
160 TCA_ACT_BPF_PAD))
160 goto nla_put_failure;
161
162 return skb->len;
163
164nla_put_failure:
165 nlmsg_trim(skb, tp);
166 return -1;
167}
168
169static const struct nla_policy act_bpf_policy[TCA_ACT_BPF_MAX + 1] = {
170 [TCA_ACT_BPF_PARMS] = { .len = sizeof(struct tc_act_bpf) },
171 [TCA_ACT_BPF_FD] = { .type = NLA_U32 },
161 goto nla_put_failure;
162
163 return skb->len;
164
165nla_put_failure:
166 nlmsg_trim(skb, tp);
167 return -1;
168}
169
170static const struct nla_policy act_bpf_policy[TCA_ACT_BPF_MAX + 1] = {
171 [TCA_ACT_BPF_PARMS] = { .len = sizeof(struct tc_act_bpf) },
172 [TCA_ACT_BPF_FD] = { .type = NLA_U32 },
172 [TCA_ACT_BPF_NAME] = { .type = NLA_NUL_STRING, .len = ACT_BPF_NAME_LEN },
173 [TCA_ACT_BPF_NAME] = { .type = NLA_NUL_STRING,
174 .len = ACT_BPF_NAME_LEN },
173 [TCA_ACT_BPF_OPS_LEN] = { .type = NLA_U16 },
174 [TCA_ACT_BPF_OPS] = { .type = NLA_BINARY,
175 .len = sizeof(struct sock_filter) * BPF_MAXINSNS },
176};
177
178static int tcf_bpf_init_from_ops(struct nlattr **tb, struct tcf_bpf_cfg *cfg)
179{
180 struct sock_filter *bpf_ops;

--- 36 unchanged lines hidden (view full) ---

217static int tcf_bpf_init_from_efd(struct nlattr **tb, struct tcf_bpf_cfg *cfg)
218{
219 struct bpf_prog *fp;
220 char *name = NULL;
221 u32 bpf_fd;
222
223 bpf_fd = nla_get_u32(tb[TCA_ACT_BPF_FD]);
224
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
180static int tcf_bpf_init_from_ops(struct nlattr **tb, struct tcf_bpf_cfg *cfg)
181{
182 struct sock_filter *bpf_ops;

--- 36 unchanged lines hidden (view full) ---

219static 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
225 fp = bpf_prog_get(bpf_fd);
227 fp = bpf_prog_get_type(bpf_fd, BPF_PROG_TYPE_SCHED_ACT);
226 if (IS_ERR(fp))
227 return PTR_ERR(fp);
228
228 if (IS_ERR(fp))
229 return PTR_ERR(fp);
230
229 if (fp->type != BPF_PROG_TYPE_SCHED_ACT) {
230 bpf_prog_put(fp);
231 return -EINVAL;
232 }
233
234 if (tb[TCA_ACT_BPF_NAME]) {
235 name = kmemdup(nla_data(tb[TCA_ACT_BPF_NAME]),
236 nla_len(tb[TCA_ACT_BPF_NAME]),
237 GFP_KERNEL);
238 if (!name) {
239 bpf_prog_put(fp);
240 return -ENOMEM;
241 }

--- 27 unchanged lines hidden (view full) ---

269 */
270 cfg->filter = rcu_dereference_protected(prog->filter, 1);
271
272 cfg->bpf_ops = prog->bpf_ops;
273 cfg->bpf_name = prog->bpf_name;
274}
275
276static int tcf_bpf_init(struct net *net, struct nlattr *nla,
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 }

--- 27 unchanged lines hidden (view full) ---

266 */
267 cfg->filter = rcu_dereference_protected(prog->filter, 1);
268
269 cfg->bpf_ops = prog->bpf_ops;
270 cfg->bpf_name = prog->bpf_name;
271}
272
273static int tcf_bpf_init(struct net *net, struct nlattr *nla,
277 struct nlattr *est, struct tc_action *act,
274 struct nlattr *est, struct tc_action **act,
278 int replace, int bind)
279{
280 struct tc_action_net *tn = net_generic(net, bpf_net_id);
281 struct nlattr *tb[TCA_ACT_BPF_MAX + 1];
282 struct tcf_bpf_cfg cfg, old;
283 struct tc_act_bpf *parm;
284 struct tcf_bpf *prog;
285 bool is_bpf, is_ebpf;

--- 8 unchanged lines hidden (view full) ---

294
295 if (!tb[TCA_ACT_BPF_PARMS])
296 return -EINVAL;
297
298 parm = nla_data(tb[TCA_ACT_BPF_PARMS]);
299
300 if (!tcf_hash_check(tn, parm->index, act, bind)) {
301 ret = tcf_hash_create(tn, parm->index, est, act,
275 int replace, int bind)
276{
277 struct tc_action_net *tn = net_generic(net, bpf_net_id);
278 struct nlattr *tb[TCA_ACT_BPF_MAX + 1];
279 struct tcf_bpf_cfg cfg, old;
280 struct tc_act_bpf *parm;
281 struct tcf_bpf *prog;
282 bool is_bpf, is_ebpf;

--- 8 unchanged lines hidden (view full) ---

291
292 if (!tb[TCA_ACT_BPF_PARMS])
293 return -EINVAL;
294
295 parm = nla_data(tb[TCA_ACT_BPF_PARMS]);
296
297 if (!tcf_hash_check(tn, parm->index, act, bind)) {
298 ret = tcf_hash_create(tn, parm->index, est, act,
302 sizeof(*prog), bind, true);
299 &act_bpf_ops, bind, true);
303 if (ret < 0)
304 return ret;
305
306 res = ACT_P_CREATED;
307 } else {
308 /* Don't override defaults. */
309 if (bind)
310 return 0;
311
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
312 tcf_hash_release(act, bind);
309 tcf_hash_release(*act, bind);
313 if (!replace)
314 return -EEXIST;
315 }
316
317 is_bpf = tb[TCA_ACT_BPF_OPS_LEN] && tb[TCA_ACT_BPF_OPS];
318 is_ebpf = tb[TCA_ACT_BPF_FD];
319
320 if ((!is_bpf && !is_ebpf) || (is_bpf && is_ebpf)) {
321 ret = -EINVAL;
322 goto out;
323 }
324
325 memset(&cfg, 0, sizeof(cfg));
326
327 ret = is_bpf ? tcf_bpf_init_from_ops(tb, &cfg) :
328 tcf_bpf_init_from_efd(tb, &cfg);
329 if (ret < 0)
330 goto out;
331
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
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)
327 goto out;
328
332 prog = to_bpf(act);
329 prog = to_bpf(*act);
333 ASSERT_RTNL();
334
335 if (res != ACT_P_CREATED)
336 tcf_bpf_prog_fill_cfg(prog, &old);
337
338 prog->bpf_ops = cfg.bpf_ops;
339 prog->bpf_name = cfg.bpf_name;
340
341 if (cfg.bpf_num_ops)
342 prog->bpf_num_ops = cfg.bpf_num_ops;
343 if (cfg.bpf_fd)
344 prog->bpf_fd = cfg.bpf_fd;
345
346 prog->tcf_action = parm->action;
347 rcu_assign_pointer(prog->filter, cfg.filter);
348
349 if (res == ACT_P_CREATED) {
330 ASSERT_RTNL();
331
332 if (res != ACT_P_CREATED)
333 tcf_bpf_prog_fill_cfg(prog, &old);
334
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;
344 rcu_assign_pointer(prog->filter, cfg.filter);
345
346 if (res == ACT_P_CREATED) {
350 tcf_hash_insert(tn, act);
347 tcf_hash_insert(tn, *act);
351 } else {
352 /* make sure the program being replaced is no longer executing */
353 synchronize_rcu();
354 tcf_bpf_cfg_cleanup(&old);
355 }
356
357 return res;
358out:
359 if (res == ACT_P_CREATED)
348 } else {
349 /* make sure the program being replaced is no longer executing */
350 synchronize_rcu();
351 tcf_bpf_cfg_cleanup(&old);
352 }
353
354 return res;
355out:
356 if (res == ACT_P_CREATED)
360 tcf_hash_cleanup(act, est);
357 tcf_hash_cleanup(*act, est);
361
362 return ret;
363}
364
365static void tcf_bpf_cleanup(struct tc_action *act, int bind)
366{
367 struct tcf_bpf_cfg tmp;
368
358
359 return ret;
360}
361
362static void tcf_bpf_cleanup(struct tc_action *act, int bind)
363{
364 struct tcf_bpf_cfg tmp;
365
369 tcf_bpf_prog_fill_cfg(act->priv, &tmp);
366 tcf_bpf_prog_fill_cfg(to_bpf(act), &tmp);
370 tcf_bpf_cfg_cleanup(&tmp);
371}
372
373static int tcf_bpf_walker(struct net *net, struct sk_buff *skb,
374 struct netlink_callback *cb, int type,
367 tcf_bpf_cfg_cleanup(&tmp);
368}
369
370static int tcf_bpf_walker(struct net *net, struct sk_buff *skb,
371 struct netlink_callback *cb, int type,
375 struct tc_action *a)
372 const struct tc_action_ops *ops)
376{
377 struct tc_action_net *tn = net_generic(net, bpf_net_id);
378
373{
374 struct tc_action_net *tn = net_generic(net, bpf_net_id);
375
379 return tcf_generic_walker(tn, skb, cb, type, a);
376 return tcf_generic_walker(tn, skb, cb, type, ops);
380}
381
377}
378
382static int tcf_bpf_search(struct net *net, struct tc_action *a, u32 index)
379static int tcf_bpf_search(struct net *net, struct tc_action **a, u32 index)
383{
384 struct tc_action_net *tn = net_generic(net, bpf_net_id);
385
386 return tcf_hash_search(tn, a, index);
387}
388
389static struct tc_action_ops act_bpf_ops __read_mostly = {
390 .kind = "bpf",
391 .type = TCA_ACT_BPF,
392 .owner = THIS_MODULE,
393 .act = tcf_bpf,
394 .dump = tcf_bpf_dump,
395 .cleanup = tcf_bpf_cleanup,
396 .init = tcf_bpf_init,
397 .walk = tcf_bpf_walker,
398 .lookup = tcf_bpf_search,
380{
381 struct tc_action_net *tn = net_generic(net, bpf_net_id);
382
383 return tcf_hash_search(tn, a, index);
384}
385
386static 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,
394 .walk = tcf_bpf_walker,
395 .lookup = tcf_bpf_search,
396 .size = sizeof(struct tcf_bpf),
399};
400
401static __net_init int bpf_init_net(struct net *net)
402{
403 struct tc_action_net *tn = net_generic(net, bpf_net_id);
404
405 return tc_action_net_init(tn, &act_bpf_ops, BPF_TAB_MASK);
406}

--- 31 unchanged lines hidden --- 		397};
398
399static __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}

--- 31 unchanged lines hidden ---