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 struct rcu_head rcu; 25 }; 26 27 static int mall_classify(struct sk_buff *skb, const struct tcf_proto *tp, 28 struct tcf_result *res) 29 { 30 struct cls_mall_head *head = rcu_dereference_bh(tp->root); 31 32 if (tc_skip_sw(head->flags)) 33 return -1; 34 35 *res = head->res; 36 return tcf_exts_exec(skb, &head->exts, res); 37 } 38 39 static int mall_init(struct tcf_proto *tp) 40 { 41 return 0; 42 } 43 44 static void mall_destroy_rcu(struct rcu_head *rcu) 45 { 46 struct cls_mall_head *head = container_of(rcu, struct cls_mall_head, 47 rcu); 48 49 tcf_exts_destroy(&head->exts); 50 kfree(head); 51 } 52 53 static int mall_replace_hw_filter(struct tcf_proto *tp, 54 struct cls_mall_head *head, 55 unsigned long cookie) 56 { 57 struct net_device *dev = tp->q->dev_queue->dev; 58 struct tc_cls_matchall_offload cls_mall = {}; 59 int err; 60 61 tc_cls_common_offload_init(&cls_mall.common, tp); 62 cls_mall.command = TC_CLSMATCHALL_REPLACE; 63 cls_mall.exts = &head->exts; 64 cls_mall.cookie = cookie; 65 66 err = dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, 67 &cls_mall); 68 if (!err) 69 head->flags |= TCA_CLS_FLAGS_IN_HW; 70 71 return err; 72 } 73 74 static void mall_destroy_hw_filter(struct tcf_proto *tp, 75 struct cls_mall_head *head, 76 unsigned long cookie) 77 { 78 struct net_device *dev = tp->q->dev_queue->dev; 79 struct tc_cls_matchall_offload cls_mall = {}; 80 81 tc_cls_common_offload_init(&cls_mall.common, tp); 82 cls_mall.command = TC_CLSMATCHALL_DESTROY; 83 cls_mall.cookie = cookie; 84 85 dev->netdev_ops->ndo_setup_tc(dev, TC_SETUP_CLSMATCHALL, &cls_mall); 86 } 87 88 static void mall_destroy(struct tcf_proto *tp) 89 { 90 struct cls_mall_head *head = rtnl_dereference(tp->root); 91 struct net_device *dev = tp->q->dev_queue->dev; 92 93 if (!head) 94 return; 95 96 if (tc_should_offload(dev, head->flags)) 97 mall_destroy_hw_filter(tp, head, (unsigned long) head); 98 99 call_rcu(&head->rcu, mall_destroy_rcu); 100 } 101 102 static void *mall_get(struct tcf_proto *tp, u32 handle) 103 { 104 return NULL; 105 } 106 107 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 108 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 109 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 110 }; 111 112 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 113 struct cls_mall_head *head, 114 unsigned long base, struct nlattr **tb, 115 struct nlattr *est, bool ovr) 116 { 117 int err; 118 119 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr); 120 if (err < 0) 121 return err; 122 123 if (tb[TCA_MATCHALL_CLASSID]) { 124 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 125 tcf_bind_filter(tp, &head->res, base); 126 } 127 return 0; 128 } 129 130 static int mall_change(struct net *net, struct sk_buff *in_skb, 131 struct tcf_proto *tp, unsigned long base, 132 u32 handle, struct nlattr **tca, 133 void **arg, bool ovr) 134 { 135 struct cls_mall_head *head = rtnl_dereference(tp->root); 136 struct net_device *dev = tp->q->dev_queue->dev; 137 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 138 struct cls_mall_head *new; 139 u32 flags = 0; 140 int err; 141 142 if (!tca[TCA_OPTIONS]) 143 return -EINVAL; 144 145 if (head) 146 return -EEXIST; 147 148 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], 149 mall_policy, NULL); 150 if (err < 0) 151 return err; 152 153 if (tb[TCA_MATCHALL_FLAGS]) { 154 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 155 if (!tc_flags_valid(flags)) 156 return -EINVAL; 157 } 158 159 new = kzalloc(sizeof(*new), GFP_KERNEL); 160 if (!new) 161 return -ENOBUFS; 162 163 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); 164 if (err) 165 goto err_exts_init; 166 167 if (!handle) 168 handle = 1; 169 new->handle = handle; 170 new->flags = flags; 171 172 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr); 173 if (err) 174 goto err_set_parms; 175 176 if (tc_should_offload(dev, flags)) { 177 err = mall_replace_hw_filter(tp, new, (unsigned long) new); 178 if (err) { 179 if (tc_skip_sw(flags)) 180 goto err_replace_hw_filter; 181 else 182 err = 0; 183 } 184 } 185 186 if (!tc_in_hw(new->flags)) 187 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 188 189 *arg = head; 190 rcu_assign_pointer(tp->root, new); 191 return 0; 192 193 err_replace_hw_filter: 194 err_set_parms: 195 tcf_exts_destroy(&new->exts); 196 err_exts_init: 197 kfree(new); 198 return err; 199 } 200 201 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last) 202 { 203 return -EOPNOTSUPP; 204 } 205 206 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) 207 { 208 struct cls_mall_head *head = rtnl_dereference(tp->root); 209 210 if (arg->count < arg->skip) 211 goto skip; 212 if (arg->fn(tp, head, arg) < 0) 213 arg->stop = 1; 214 skip: 215 arg->count++; 216 } 217 218 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 219 struct sk_buff *skb, struct tcmsg *t) 220 { 221 struct cls_mall_head *head = fh; 222 struct nlattr *nest; 223 224 if (!head) 225 return skb->len; 226 227 t->tcm_handle = head->handle; 228 229 nest = nla_nest_start(skb, TCA_OPTIONS); 230 if (!nest) 231 goto nla_put_failure; 232 233 if (head->res.classid && 234 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 235 goto nla_put_failure; 236 237 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 238 goto nla_put_failure; 239 240 if (tcf_exts_dump(skb, &head->exts)) 241 goto nla_put_failure; 242 243 nla_nest_end(skb, nest); 244 245 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 246 goto nla_put_failure; 247 248 return skb->len; 249 250 nla_put_failure: 251 nla_nest_cancel(skb, nest); 252 return -1; 253 } 254 255 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 256 { 257 struct cls_mall_head *head = fh; 258 259 if (head && head->res.classid == classid) 260 head->res.class = cl; 261 } 262 263 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 264 .kind = "matchall", 265 .classify = mall_classify, 266 .init = mall_init, 267 .destroy = mall_destroy, 268 .get = mall_get, 269 .change = mall_change, 270 .delete = mall_delete, 271 .walk = mall_walk, 272 .dump = mall_dump, 273 .bind_class = mall_bind_class, 274 .owner = THIS_MODULE, 275 }; 276 277 static int __init cls_mall_init(void) 278 { 279 return register_tcf_proto_ops(&cls_mall_ops); 280 } 281 282 static void __exit cls_mall_exit(void) 283 { 284 unregister_tcf_proto_ops(&cls_mall_ops); 285 } 286 287 module_init(cls_mall_init); 288 module_exit(cls_mall_exit); 289 290 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 291 MODULE_DESCRIPTION("Match-all classifier"); 292 MODULE_LICENSE("GPL v2"); 293