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_work rwork; 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(struct cls_mall_head *head) 45 { 46 tcf_exts_destroy(&head->exts); 47 tcf_exts_put_net(&head->exts); 48 kfree(head); 49 } 50 51 static void mall_destroy_work(struct work_struct *work) 52 { 53 struct cls_mall_head *head = container_of(to_rcu_work(work), 54 struct cls_mall_head, 55 rwork); 56 rtnl_lock(); 57 __mall_destroy(head); 58 rtnl_unlock(); 59 } 60 61 static void mall_destroy_hw_filter(struct tcf_proto *tp, 62 struct cls_mall_head *head, 63 unsigned long cookie, 64 struct netlink_ext_ack *extack) 65 { 66 struct tc_cls_matchall_offload cls_mall = {}; 67 struct tcf_block *block = tp->chain->block; 68 69 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 70 cls_mall.command = TC_CLSMATCHALL_DESTROY; 71 cls_mall.cookie = cookie; 72 73 tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, &cls_mall, false); 74 tcf_block_offload_dec(block, &head->flags); 75 } 76 77 static int mall_replace_hw_filter(struct tcf_proto *tp, 78 struct cls_mall_head *head, 79 unsigned long cookie, 80 struct netlink_ext_ack *extack) 81 { 82 struct tc_cls_matchall_offload cls_mall = {}; 83 struct tcf_block *block = tp->chain->block; 84 bool skip_sw = tc_skip_sw(head->flags); 85 int err; 86 87 tc_cls_common_offload_init(&cls_mall.common, tp, head->flags, extack); 88 cls_mall.command = TC_CLSMATCHALL_REPLACE; 89 cls_mall.exts = &head->exts; 90 cls_mall.cookie = cookie; 91 92 err = tc_setup_cb_call(block, NULL, TC_SETUP_CLSMATCHALL, 93 &cls_mall, skip_sw); 94 if (err < 0) { 95 mall_destroy_hw_filter(tp, head, cookie, NULL); 96 return err; 97 } else if (err > 0) { 98 tcf_block_offload_inc(block, &head->flags); 99 } 100 101 if (skip_sw && !(head->flags & TCA_CLS_FLAGS_IN_HW)) 102 return -EINVAL; 103 104 return 0; 105 } 106 107 static void mall_destroy(struct tcf_proto *tp, struct netlink_ext_ack *extack) 108 { 109 struct cls_mall_head *head = rtnl_dereference(tp->root); 110 111 if (!head) 112 return; 113 114 if (!tc_skip_hw(head->flags)) 115 mall_destroy_hw_filter(tp, head, (unsigned long) head, extack); 116 117 if (tcf_exts_get_net(&head->exts)) 118 tcf_queue_work(&head->rwork, mall_destroy_work); 119 else 120 __mall_destroy(head); 121 } 122 123 static void *mall_get(struct tcf_proto *tp, u32 handle) 124 { 125 return NULL; 126 } 127 128 static const struct nla_policy mall_policy[TCA_MATCHALL_MAX + 1] = { 129 [TCA_MATCHALL_UNSPEC] = { .type = NLA_UNSPEC }, 130 [TCA_MATCHALL_CLASSID] = { .type = NLA_U32 }, 131 }; 132 133 static int mall_set_parms(struct net *net, struct tcf_proto *tp, 134 struct cls_mall_head *head, 135 unsigned long base, struct nlattr **tb, 136 struct nlattr *est, bool ovr, 137 struct netlink_ext_ack *extack) 138 { 139 int err; 140 141 err = tcf_exts_validate(net, tp, tb, est, &head->exts, ovr, extack); 142 if (err < 0) 143 return err; 144 145 if (tb[TCA_MATCHALL_CLASSID]) { 146 head->res.classid = nla_get_u32(tb[TCA_MATCHALL_CLASSID]); 147 tcf_bind_filter(tp, &head->res, base); 148 } 149 return 0; 150 } 151 152 static int mall_change(struct net *net, struct sk_buff *in_skb, 153 struct tcf_proto *tp, unsigned long base, 154 u32 handle, struct nlattr **tca, 155 void **arg, bool ovr, struct netlink_ext_ack *extack) 156 { 157 struct cls_mall_head *head = rtnl_dereference(tp->root); 158 struct nlattr *tb[TCA_MATCHALL_MAX + 1]; 159 struct cls_mall_head *new; 160 u32 flags = 0; 161 int err; 162 163 if (!tca[TCA_OPTIONS]) 164 return -EINVAL; 165 166 if (head) 167 return -EEXIST; 168 169 err = nla_parse_nested(tb, TCA_MATCHALL_MAX, tca[TCA_OPTIONS], 170 mall_policy, NULL); 171 if (err < 0) 172 return err; 173 174 if (tb[TCA_MATCHALL_FLAGS]) { 175 flags = nla_get_u32(tb[TCA_MATCHALL_FLAGS]); 176 if (!tc_flags_valid(flags)) 177 return -EINVAL; 178 } 179 180 new = kzalloc(sizeof(*new), GFP_KERNEL); 181 if (!new) 182 return -ENOBUFS; 183 184 err = tcf_exts_init(&new->exts, TCA_MATCHALL_ACT, 0); 185 if (err) 186 goto err_exts_init; 187 188 if (!handle) 189 handle = 1; 190 new->handle = handle; 191 new->flags = flags; 192 193 err = mall_set_parms(net, tp, new, base, tb, tca[TCA_RATE], ovr, 194 extack); 195 if (err) 196 goto err_set_parms; 197 198 if (!tc_skip_hw(new->flags)) { 199 err = mall_replace_hw_filter(tp, new, (unsigned long)new, 200 extack); 201 if (err) 202 goto err_replace_hw_filter; 203 } 204 205 if (!tc_in_hw(new->flags)) 206 new->flags |= TCA_CLS_FLAGS_NOT_IN_HW; 207 208 *arg = head; 209 rcu_assign_pointer(tp->root, new); 210 return 0; 211 212 err_replace_hw_filter: 213 err_set_parms: 214 tcf_exts_destroy(&new->exts); 215 err_exts_init: 216 kfree(new); 217 return err; 218 } 219 220 static int mall_delete(struct tcf_proto *tp, void *arg, bool *last, 221 struct netlink_ext_ack *extack) 222 { 223 return -EOPNOTSUPP; 224 } 225 226 static void mall_walk(struct tcf_proto *tp, struct tcf_walker *arg) 227 { 228 struct cls_mall_head *head = rtnl_dereference(tp->root); 229 230 if (arg->count < arg->skip) 231 goto skip; 232 if (arg->fn(tp, head, arg) < 0) 233 arg->stop = 1; 234 skip: 235 arg->count++; 236 } 237 238 static int mall_dump(struct net *net, struct tcf_proto *tp, void *fh, 239 struct sk_buff *skb, struct tcmsg *t) 240 { 241 struct cls_mall_head *head = fh; 242 struct nlattr *nest; 243 244 if (!head) 245 return skb->len; 246 247 t->tcm_handle = head->handle; 248 249 nest = nla_nest_start(skb, TCA_OPTIONS); 250 if (!nest) 251 goto nla_put_failure; 252 253 if (head->res.classid && 254 nla_put_u32(skb, TCA_MATCHALL_CLASSID, head->res.classid)) 255 goto nla_put_failure; 256 257 if (head->flags && nla_put_u32(skb, TCA_MATCHALL_FLAGS, head->flags)) 258 goto nla_put_failure; 259 260 if (tcf_exts_dump(skb, &head->exts)) 261 goto nla_put_failure; 262 263 nla_nest_end(skb, nest); 264 265 if (tcf_exts_dump_stats(skb, &head->exts) < 0) 266 goto nla_put_failure; 267 268 return skb->len; 269 270 nla_put_failure: 271 nla_nest_cancel(skb, nest); 272 return -1; 273 } 274 275 static void mall_bind_class(void *fh, u32 classid, unsigned long cl) 276 { 277 struct cls_mall_head *head = fh; 278 279 if (head && head->res.classid == classid) 280 head->res.class = cl; 281 } 282 283 static struct tcf_proto_ops cls_mall_ops __read_mostly = { 284 .kind = "matchall", 285 .classify = mall_classify, 286 .init = mall_init, 287 .destroy = mall_destroy, 288 .get = mall_get, 289 .change = mall_change, 290 .delete = mall_delete, 291 .walk = mall_walk, 292 .dump = mall_dump, 293 .bind_class = mall_bind_class, 294 .owner = THIS_MODULE, 295 }; 296 297 static int __init cls_mall_init(void) 298 { 299 return register_tcf_proto_ops(&cls_mall_ops); 300 } 301 302 static void __exit cls_mall_exit(void) 303 { 304 unregister_tcf_proto_ops(&cls_mall_ops); 305 } 306 307 module_init(cls_mall_init); 308 module_exit(cls_mall_exit); 309 310 MODULE_AUTHOR("Jiri Pirko <jiri@mellanox.com>"); 311 MODULE_DESCRIPTION("Match-all classifier"); 312 MODULE_LICENSE("GPL v2"); 313