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