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