1 /* 2 * net/sched/cls_matchll.c Match-all classifier 3 * 4 * Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/init.h> 14 #include <linux/module.h> 15 16 #include <net/sch_generic.h> 17 #include <net/pkt_cls.h> 18 19 struct cls_mall_head { 20 struct tcf_exts exts; 21 struct tcf_result res; 22 u32 handle; 23 u32 flags; 24 union { 25 struct work_struct work; 26 struct rcu_head rcu; 27 }; 28 }; 29 30 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, 31 struct tcf_result *res) 32 { 33 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 34 35 if (tc_skip_sw(head->flags)) 36 return -1; 37 38 *res = head->res; 39 return tcf_exts_exec(skb, &head->exts, res); 40 } 41 42 static int mall_init(struct tcf_proto *tp) 43 { 44 return 0; 45 } 46 47 static void __mall_destroy(struct cls_mall_head *head) 48 { 49 tcf_exts_destroy(&head->exts); 50 tcf_exts_put_net(&head->exts); 51 kfree(head); 52 } 53 54 static void mall_destroy_work(struct work_struct *work) 55 { 56 struct cls_mall_head *head = container_of(work, struct cls_mall_head, 57 work); 58 rtnl_lock(); 59 __mall_destroy(head); 60 rtnl_unlock(); 61 } 62 63 static void mall_destroy_rcu(struct rcu_head *rcu) 64 { 65 struct cls_mall_head *head = container_of(rcu, struct cls_mall_head, 66 rcu); 67 68 INIT_WORK(&head->work, mall_destroy_work); 69 tcf_queue_work(&head->work); 70 } 71 72 static void mall_destroy_hw_filter(struct tcf_proto *tp, 73 struct cls_mall_head *head, 74 unsigned long cookie) 75 { 76 struct tc_cls_matchall_offload cls_mall = {}; 77 struct tcf_block *block = tp->chain->block; 78 79 tc_cls_common_offload_init(&cls_mall.common, tp); 80 cls_mall.command = TC_CLSMATCHALL_DESTROY; 81 cls_mall.cookie = cookie; 82 83 tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, &cls_mall, false); 84 tcf_block_offload_dec(block, &head->flags); 85 } 86 87 static int mall_replace_hw_filter(struct tcf_proto *tp, 88 struct cls_mall_head *head, 89 unsigned long cookie) 90 { 91 struct tc_cls_matchall_offload cls_mall = {}; 92 struct tcf_block *block = tp->chain->block; 93 bool skip_sw = tc_skip_sw(head->flags); 94 int err; 95 96 tc_cls_common_offload_init(&cls_mall.common, tp); 97 cls_mall.command = TC_CLSMATCHALL_REPLACE; 98 cls_mall.exts = &head->exts; 99 cls_mall.cookie = cookie; 100 101 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, 102 &cls_mall, skip_sw); 103 if (err < 0) { 104 mall_destroy_hw_filter(tp, head, cookie); 105 return err; 106 } else if (err > 0) { 107 tcf_block_offload_inc(block, &head->flags); 108 } 109 110 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 111 return -EINVAL; 112 113 return 0; 114 } 115 116 static void mall_destroy(struct tcf_proto *tp) 117 { 118 struct cls_mall_head *head = rtnl_dereference(tp->root); 119 120 if (!head) 121 return; 122 123 if (!tc_skip_hw(head->flags)) 124 mall_destroy_hw_filter(tp, head, (unsigned long) head); 125 126 if (tcf_exts_get_net(&head->exts)) 127 call_rcu(&head->rcu, mall_destroy_rcu); 128 else 129 __mall_destroy(head); 130 } 131 132 static void *mall_get(struct tcf_proto *tp, u32 handle) 133 { 134 return NULL; 135 } 136 137 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 138 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 139 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 140 }; 141 142 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 143 struct cls_mall_head *head, 144 unsigned long base, struct nlattr **tb, 145 struct nlattr *est, bool ovr) 146 { 147 int err; 148 149 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr); 150 if (err < 0) 151 return err; 152 153 if (tb[TCA_MATCHALL_CLASSID]) { 154 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 155 tcf_bind_filter(tp, &head->res, base); 156 } 157 return 0; 158 } 159 160 static int mall_change(struct net *net, struct sk_buff *in_skb, 161 struct tcf_proto *tp, unsigned long base, 162 u32 handle, struct nlattr **tca, 163 void **arg, bool ovr, struct netlink_ext_ack *extack) 164 { 165 struct cls_mall_head *head = rtnl_dereference(tp->root); 166 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 167 struct cls_mall_head *new; 168 u32 flags = 0; 169 int err; 170 171 if (!tca[TCA_OPTIONS]) 172 return -EINVAL; 173 174 if (head) 175 return -EEXIST; 176 177 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], 178 mall_policy, NULL); 179 if (err < 0) 180 return err; 181 182 if (tb[TCA_MATCHALL_FLAGS]) { 183 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 184 if (!tc_flags_valid(flags)) 185 return -EINVAL; 186 } 187 188 new = kzalloc(sizeof(*new), GFP_KERNEL); 189 if (!new) 190 return -ENOBUFS; 191 192 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); 193 if (err) 194 goto err_exts_init; 195 196 if (!handle) 197 handle = 1; 198 new->handle = handle; 199 new->flags = flags; 200 201 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); 202 if (err) 203 goto err_set_parms; 204 205 if (!tc_skip_hw(new->flags)) { 206 err = mall_replace_hw_filter(tp, new, (unsigned long)new); 207 if (err) 208 goto err_replace_hw_filter; 209 } 210 211 if (!tc_in_hw(new->flags)) 212 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 213 214 *arg = head; 215 rcu_assign_pointer(tp->root, new); 216 return 0; 217 218 err_replace_hw_filter: 219 err_set_parms: 220 tcf_exts_destroy(&new->exts); 221 err_exts_init: 222 kfree(new); 223 return err; 224 } 225 226 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last) 227 { 228 return -EOPNOTSUPP; 229 } 230 231 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) 232 { 233 struct cls_mall_head *head = rtnl_dereference(tp->root); 234 235 if (arg->count < arg->skip) 236 goto skip; 237 if (arg->fn(tp, head, arg) < 0) 238 arg->stop = 1; 239 skip: 240 arg->count++; 241 } 242 243 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 244 struct sk_buff *skb, struct tcmsg *t) 245 { 246 struct cls_mall_head *head = fh; 247 struct nlattr *nest; 248 249 if (!head) 250 return skb->len; 251 252 t->tcm_handle = head->handle; 253 254 nest = nla_nest_start(skb, TCA_OPTIONS); 255 if (!nest) 256 goto nla_put_failure; 257 258 if (head->res.classid && 259 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 260 goto nla_put_failure; 261 262 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 263 goto nla_put_failure; 264 265 if (tcf_exts_dump(skb, &head->exts)) 266 goto nla_put_failure; 267 268 nla_nest_end(skb, nest); 269 270 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 271 goto nla_put_failure; 272 273 return skb->len; 274 275 nla_put_failure: 276 nla_nest_cancel(skb, nest); 277 return -1; 278 } 279 280 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 281 { 282 struct cls_mall_head *head = fh; 283 284 if (head && head->res.classid == classid) 285 head->res.class = cl; 286 } 287 288 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 289 .kind = "matchall", 290 .classify = mall_classify, 291 .init = mall_init, 292 .destroy = mall_destroy, 293 .get = mall_get, 294 .change = mall_change, 295 .delete = mall_delete, 296 .walk = mall_walk, 297 .dump = mall_dump, 298 .bind_class = mall_bind_class, 299 .owner = THIS_MODULE, 300 }; 301 302 static int __init cls_mall_init(void) 303 { 304 return register_tcf_proto_ops(&cls_mall_ops); 305 } 306 307 static void __exit cls_mall_exit(void) 308 { 309 unregister_tcf_proto_ops(&cls_mall_ops); 310 } 311 312 module_init(cls_mall_init); 313 module_exit(cls_mall_exit); 314 315 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 316 MODULE_DESCRIPTION("Match-all classifier"); 317 MODULE_LICENSE("GPL v2"); 318