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