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 } 85 86 static int mall_replace_hw_filter(struct tcf_proto *tp, 87 struct cls_mall_head *head, 88 unsigned long cookie) 89 { 90 struct tc_cls_matchall_offload cls_mall = {}; 91 struct tcf_block *block = tp->chain->block; 92 bool skip_sw = tc_skip_sw(head->flags); 93 int err; 94 95 tc_cls_common_offload_init(&cls_mall.common, tp); 96 cls_mall.command = TC_CLSMATCHALL_REPLACE; 97 cls_mall.exts = &head->exts; 98 cls_mall.cookie = cookie; 99 100 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, 101 &cls_mall, skip_sw); 102 if (err < 0) { 103 mall_destroy_hw_filter(tp, head, cookie); 104 return err; 105 } else if (err > 0) { 106 head->flags |= TCA_CLS_FLAGS_IN_HW; 107 } 108 109 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 110 return -EINVAL; 111 112 return 0; 113 } 114 115 static void mall_destroy(struct tcf_proto *tp) 116 { 117 struct cls_mall_head *head = rtnl_dereference(tp->root); 118 119 if (!head) 120 return; 121 122 if (!tc_skip_hw(head->flags)) 123 mall_destroy_hw_filter(tp, head, (unsigned long) head); 124 125 if (tcf_exts_get_net(&head->exts)) 126 call_rcu(&head->rcu, mall_destroy_rcu); 127 else 128 __mall_destroy(head); 129 } 130 131 static void *mall_get(struct tcf_proto *tp, u32 handle) 132 { 133 return NULL; 134 } 135 136 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 137 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 138 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 139 }; 140 141 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 142 struct cls_mall_head *head, 143 unsigned long base, struct nlattr **tb, 144 struct nlattr *est, bool ovr) 145 { 146 int err; 147 148 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr); 149 if (err < 0) 150 return err; 151 152 if (tb[TCA_MATCHALL_CLASSID]) { 153 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 154 tcf_bind_filter(tp, &head->res, base); 155 } 156 return 0; 157 } 158 159 static int mall_change(struct net *net, struct sk_buff *in_skb, 160 struct tcf_proto *tp, unsigned long base, 161 u32 handle, struct nlattr **tca, 162 void **arg, bool ovr) 163 { 164 struct cls_mall_head *head = rtnl_dereference(tp->root); 165 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 166 struct cls_mall_head *new; 167 u32 flags = 0; 168 int err; 169 170 if (!tca[TCA_OPTIONS]) 171 return -EINVAL; 172 173 if (head) 174 return -EEXIST; 175 176 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], 177 mall_policy, NULL); 178 if (err < 0) 179 return err; 180 181 if (tb[TCA_MATCHALL_FLAGS]) { 182 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 183 if (!tc_flags_valid(flags)) 184 return -EINVAL; 185 } 186 187 new = kzalloc(sizeof(*new), GFP_KERNEL); 188 if (!new) 189 return -ENOBUFS; 190 191 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); 192 if (err) 193 goto err_exts_init; 194 195 if (!handle) 196 handle = 1; 197 new->handle = handle; 198 new->flags = flags; 199 200 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); 201 if (err) 202 goto err_set_parms; 203 204 if (!tc_skip_hw(new->flags)) { 205 err = mall_replace_hw_filter(tp, new, (unsigned long) new); 206 if (err) 207 goto err_replace_hw_filter; 208 } 209 210 if (!tc_in_hw(new->flags)) 211 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 212 213 *arg = head; 214 rcu_assign_pointer(tp->root, new); 215 return 0; 216 217 err_replace_hw_filter: 218 err_set_parms: 219 tcf_exts_destroy(&new->exts); 220 err_exts_init: 221 kfree(new); 222 return err; 223 } 224 225 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last) 226 { 227 return -EOPNOTSUPP; 228 } 229 230 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) 231 { 232 struct cls_mall_head *head = rtnl_dereference(tp->root); 233 234 if (arg->count < arg->skip) 235 goto skip; 236 if (arg->fn(tp, head, arg) < 0) 237 arg->stop = 1; 238 skip: 239 arg->count++; 240 } 241 242 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 243 struct sk_buff *skb, struct tcmsg *t) 244 { 245 struct cls_mall_head *head = fh; 246 struct nlattr *nest; 247 248 if (!head) 249 return skb->len; 250 251 t->tcm_handle = head->handle; 252 253 nest = nla_nest_start(skb, TCA_OPTIONS); 254 if (!nest) 255 goto nla_put_failure; 256 257 if (head->res.classid && 258 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 259 goto nla_put_failure; 260 261 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 262 goto nla_put_failure; 263 264 if (tcf_exts_dump(skb, &head->exts)) 265 goto nla_put_failure; 266 267 nla_nest_end(skb, nest); 268 269 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 270 goto nla_put_failure; 271 272 return skb->len; 273 274 nla_put_failure: 275 nla_nest_cancel(skb, nest); 276 return -1; 277 } 278 279 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 280 { 281 struct cls_mall_head *head = fh; 282 283 if (head && head->res.classid == classid) 284 head->res.class = cl; 285 } 286 287 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 288 .kind = "matchall", 289 .classify = mall_classify, 290 .init = mall_init, 291 .destroy = mall_destroy, 292 .get = mall_get, 293 .change = mall_change, 294 .delete = mall_delete, 295 .walk = mall_walk, 296 .dump = mall_dump, 297 .bind_class = mall_bind_class, 298 .owner = THIS_MODULE, 299 }; 300 301 static int __init cls_mall_init(void) 302 { 303 return register_tcf_proto_ops(&cls_mall_ops); 304 } 305 306 static void __exit cls_mall_exit(void) 307 { 308 unregister_tcf_proto_ops(&cls_mall_ops); 309 } 310 311 module_init(cls_mall_init); 312 module_exit(cls_mall_exit); 313 314 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 315 MODULE_DESCRIPTION("Match-all classifier"); 316 MODULE_LICENSE("GPL v2"); 317