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_work(struct work_struct *work) 48 { 49 struct cls_mall_head *head = container_of(work, struct cls_mall_head, 50 work); 51 rtnl_lock(); 52 tcf_exts_destroy(&head->exts); 53 kfree(head); 54 rtnl_unlock(); 55 } 56 57 static void mall_destroy_rcu(struct rcu_head *rcu) 58 { 59 struct cls_mall_head *head = container_of(rcu, struct cls_mall_head, 60 rcu); 61 62 INIT_WORK(&head->work, mall_destroy_work); 63 tcf_queue_work(&head->work); 64 } 65 66 static void mall_destroy_hw_filter(struct tcf_proto *tp, 67 struct cls_mall_head *head, 68 unsigned long cookie) 69 { 70 struct tc_cls_matchall_offload cls_mall = {}; 71 struct tcf_block *block = tp->chain->block; 72 73 tc_cls_common_offload_init(&cls_mall.common, tp); 74 cls_mall.command = TC_CLSMATCHALL_DESTROY; 75 cls_mall.cookie = cookie; 76 77 tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, &cls_mall, false); 78 } 79 80 static int mall_replace_hw_filter(struct tcf_proto *tp, 81 struct cls_mall_head *head, 82 unsigned long cookie) 83 { 84 struct tc_cls_matchall_offload cls_mall = {}; 85 struct tcf_block *block = tp->chain->block; 86 bool skip_sw = tc_skip_sw(head->flags); 87 int err; 88 89 tc_cls_common_offload_init(&cls_mall.common, tp); 90 cls_mall.command = TC_CLSMATCHALL_REPLACE; 91 cls_mall.exts = &head->exts; 92 cls_mall.cookie = cookie; 93 94 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, 95 &cls_mall, skip_sw); 96 if (err < 0) { 97 mall_destroy_hw_filter(tp, head, cookie); 98 return err; 99 } else if (err > 0) { 100 head->flags |= TCA_CLS_FLAGS_IN_HW; 101 } 102 103 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 104 return -EINVAL; 105 106 return 0; 107 } 108 109 static void mall_destroy(struct tcf_proto *tp) 110 { 111 struct cls_mall_head *head = rtnl_dereference(tp->root); 112 113 if (!head) 114 return; 115 116 if (!tc_skip_hw(head->flags)) 117 mall_destroy_hw_filter(tp, head, (unsigned long) head); 118 119 call_rcu(&head->rcu, mall_destroy_rcu); 120 } 121 122 static void *mall_get(struct tcf_proto *tp, u32 handle) 123 { 124 return NULL; 125 } 126 127 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 128 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 129 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 130 }; 131 132 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 133 struct cls_mall_head *head, 134 unsigned long base, struct nlattr **tb, 135 struct nlattr *est, bool ovr) 136 { 137 int err; 138 139 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr); 140 if (err < 0) 141 return err; 142 143 if (tb[TCA_MATCHALL_CLASSID]) { 144 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 145 tcf_bind_filter(tp, &head->res, base); 146 } 147 return 0; 148 } 149 150 static int mall_change(struct net *net, struct sk_buff *in_skb, 151 struct tcf_proto *tp, unsigned long base, 152 u32 handle, struct nlattr **tca, 153 void **arg, bool ovr) 154 { 155 struct cls_mall_head *head = rtnl_dereference(tp->root); 156 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 157 struct cls_mall_head *new; 158 u32 flags = 0; 159 int err; 160 161 if (!tca[TCA_OPTIONS]) 162 return -EINVAL; 163 164 if (head) 165 return -EEXIST; 166 167 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], 168 mall_policy, NULL); 169 if (err < 0) 170 return err; 171 172 if (tb[TCA_MATCHALL_FLAGS]) { 173 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 174 if (!tc_flags_valid(flags)) 175 return -EINVAL; 176 } 177 178 new = kzalloc(sizeof(*new), GFP_KERNEL); 179 if (!new) 180 return -ENOBUFS; 181 182 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); 183 if (err) 184 goto err_exts_init; 185 186 if (!handle) 187 handle = 1; 188 new->handle = handle; 189 new->flags = flags; 190 191 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); 192 if (err) 193 goto err_set_parms; 194 195 if (!tc_skip_hw(new->flags)) { 196 err = mall_replace_hw_filter(tp, new, (unsigned long) new); 197 if (err) 198 goto err_replace_hw_filter; 199 } 200 201 if (!tc_in_hw(new->flags)) 202 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 203 204 *arg = head; 205 rcu_assign_pointer(tp->root, new); 206 return 0; 207 208 err_replace_hw_filter: 209 err_set_parms: 210 tcf_exts_destroy(&new->exts); 211 err_exts_init: 212 kfree(new); 213 return err; 214 } 215 216 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last) 217 { 218 return -EOPNOTSUPP; 219 } 220 221 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) 222 { 223 struct cls_mall_head *head = rtnl_dereference(tp->root); 224 225 if (arg->count < arg->skip) 226 goto skip; 227 if (arg->fn(tp, head, arg) < 0) 228 arg->stop = 1; 229 skip: 230 arg->count++; 231 } 232 233 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 234 struct sk_buff *skb, struct tcmsg *t) 235 { 236 struct cls_mall_head *head = fh; 237 struct nlattr *nest; 238 239 if (!head) 240 return skb->len; 241 242 t->tcm_handle = head->handle; 243 244 nest = nla_nest_start(skb, TCA_OPTIONS); 245 if (!nest) 246 goto nla_put_failure; 247 248 if (head->res.classid && 249 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 250 goto nla_put_failure; 251 252 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 253 goto nla_put_failure; 254 255 if (tcf_exts_dump(skb, &head->exts)) 256 goto nla_put_failure; 257 258 nla_nest_end(skb, nest); 259 260 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 261 goto nla_put_failure; 262 263 return skb->len; 264 265 nla_put_failure: 266 nla_nest_cancel(skb, nest); 267 return -1; 268 } 269 270 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 271 { 272 struct cls_mall_head *head = fh; 273 274 if (head && head->res.classid == classid) 275 head->res.class = cl; 276 } 277 278 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 279 .kind = "matchall", 280 .classify = mall_classify, 281 .init = mall_init, 282 .destroy = mall_destroy, 283 .get = mall_get, 284 .change = mall_change, 285 .delete = mall_delete, 286 .walk = mall_walk, 287 .dump = mall_dump, 288 .bind_class = mall_bind_class, 289 .owner = THIS_MODULE, 290 }; 291 292 static int __init cls_mall_init(void) 293 { 294 return register_tcf_proto_ops(&cls_mall_ops); 295 } 296 297 static void __exit cls_mall_exit(void) 298 { 299 unregister_tcf_proto_ops(&cls_mall_ops); 300 } 301 302 module_init(cls_mall_init); 303 module_exit(cls_mall_exit); 304 305 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 306 MODULE_DESCRIPTION("Match-all classifier"); 307 MODULE_LICENSE("GPL v2"); 308