1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2014 Jiri Pirko <jiri@resnulli.us> 4 */ 5 6 #include <linux/module.h> 7 #include <linux/init.h> 8 #include <linux/kernel.h> 9 #include <linux/skbuff.h> 10 #include <linux/rtnetlink.h> 11 #include <linux/if_vlan.h> 12 #include <net/netlink.h> 13 #include <net/pkt_sched.h> 14 #include <net/pkt_cls.h> 15 16 #include <linux/tc_act/tc_vlan.h> 17 #include <net/tc_act/tc_vlan.h> 18 19 static unsigned int vlan_net_id; 20 static struct tc_action_ops act_vlan_ops; 21 22 static int tcf_vlan_act(struct sk_buff *skb, const struct tc_action *a, 23 struct tcf_result *res) 24 { 25 struct tcf_vlan *v = to_vlan(a); 26 struct tcf_vlan_params *p; 27 int action; 28 int err; 29 u16 tci; 30 31 tcf_lastuse_update(&v->tcf_tm); 32 bstats_cpu_update(this_cpu_ptr(v->common.cpu_bstats), skb); 33 34 /* Ensure 'data' points at mac_header prior calling vlan manipulating 35 * functions. 36 */ 37 if (skb_at_tc_ingress(skb)) 38 skb_push_rcsum(skb, skb->mac_len); 39 40 action = READ_ONCE(v->tcf_action); 41 42 p = rcu_dereference_bh(v->vlan_p); 43 44 switch (p->tcfv_action) { 45 case TCA_VLAN_ACT_POP: 46 err = skb_vlan_pop(skb); 47 if (err) 48 goto drop; 49 break; 50 case TCA_VLAN_ACT_PUSH: 51 err = skb_vlan_push(skb, p->tcfv_push_proto, p->tcfv_push_vid | 52 (p->tcfv_push_prio << VLAN_PRIO_SHIFT)); 53 if (err) 54 goto drop; 55 break; 56 case TCA_VLAN_ACT_MODIFY: 57 /* No-op if no vlan tag (either hw-accel or in-payload) */ 58 if (!skb_vlan_tagged(skb)) 59 goto out; 60 /* extract existing tag (and guarantee no hw-accel tag) */ 61 if (skb_vlan_tag_present(skb)) { 62 tci = skb_vlan_tag_get(skb); 63 __vlan_hwaccel_clear_tag(skb); 64 } else { 65 /* in-payload vlan tag, pop it */ 66 err = __skb_vlan_pop(skb, &tci); 67 if (err) 68 goto drop; 69 } 70 /* replace the vid */ 71 tci = (tci & ~VLAN_VID_MASK) | p->tcfv_push_vid; 72 /* replace prio bits, if tcfv_push_prio specified */ 73 if (p->tcfv_push_prio) { 74 tci &= ~VLAN_PRIO_MASK; 75 tci |= p->tcfv_push_prio << VLAN_PRIO_SHIFT; 76 } 77 /* put updated tci as hwaccel tag */ 78 __vlan_hwaccel_put_tag(skb, p->tcfv_push_proto, tci); 79 break; 80 default: 81 BUG(); 82 } 83 84 out: 85 if (skb_at_tc_ingress(skb)) 86 skb_pull_rcsum(skb, skb->mac_len); 87 88 return action; 89 90 drop: 91 qstats_drop_inc(this_cpu_ptr(v->common.cpu_qstats)); 92 return TC_ACT_SHOT; 93 } 94 95 static const struct nla_policy vlan_policy[TCA_VLAN_MAX + 1] = { 96 [TCA_VLAN_PARMS] = { .len = sizeof(struct tc_vlan) }, 97 [TCA_VLAN_PUSH_VLAN_ID] = { .type = NLA_U16 }, 98 [TCA_VLAN_PUSH_VLAN_PROTOCOL] = { .type = NLA_U16 }, 99 [TCA_VLAN_PUSH_VLAN_PRIORITY] = { .type = NLA_U8 }, 100 }; 101 102 static int tcf_vlan_init(struct net *net, struct nlattr *nla, 103 struct nlattr *est, struct tc_action **a, 104 int ovr, int bind, bool rtnl_held, 105 struct tcf_proto *tp, struct netlink_ext_ack *extack) 106 { 107 struct tc_action_net *tn = net_generic(net, vlan_net_id); 108 struct nlattr *tb[TCA_VLAN_MAX + 1]; 109 struct tcf_chain *goto_ch = NULL; 110 struct tcf_vlan_params *p; 111 struct tc_vlan *parm; 112 struct tcf_vlan *v; 113 int action; 114 u16 push_vid = 0; 115 __be16 push_proto = 0; 116 u8 push_prio = 0; 117 bool exists = false; 118 int ret = 0, err; 119 120 if (!nla) 121 return -EINVAL; 122 123 err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy, 124 NULL); 125 if (err < 0) 126 return err; 127 128 if (!tb[TCA_VLAN_PARMS]) 129 return -EINVAL; 130 parm = nla_data(tb[TCA_VLAN_PARMS]); 131 err = tcf_idr_check_alloc(tn, &parm->index, a, bind); 132 if (err < 0) 133 return err; 134 exists = err; 135 if (exists && bind) 136 return 0; 137 138 switch (parm->v_action) { 139 case TCA_VLAN_ACT_POP: 140 break; 141 case TCA_VLAN_ACT_PUSH: 142 case TCA_VLAN_ACT_MODIFY: 143 if (!tb[TCA_VLAN_PUSH_VLAN_ID]) { 144 if (exists) 145 tcf_idr_release(*a, bind); 146 else 147 tcf_idr_cleanup(tn, parm->index); 148 return -EINVAL; 149 } 150 push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]); 151 if (push_vid >= VLAN_VID_MASK) { 152 if (exists) 153 tcf_idr_release(*a, bind); 154 else 155 tcf_idr_cleanup(tn, parm->index); 156 return -ERANGE; 157 } 158 159 if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) { 160 push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]); 161 switch (push_proto) { 162 case htons(ETH_P_8021Q): 163 case htons(ETH_P_8021AD): 164 break; 165 default: 166 if (exists) 167 tcf_idr_release(*a, bind); 168 else 169 tcf_idr_cleanup(tn, parm->index); 170 return -EPROTONOSUPPORT; 171 } 172 } else { 173 push_proto = htons(ETH_P_8021Q); 174 } 175 176 if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY]) 177 push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]); 178 break; 179 default: 180 if (exists) 181 tcf_idr_release(*a, bind); 182 else 183 tcf_idr_cleanup(tn, parm->index); 184 return -EINVAL; 185 } 186 action = parm->v_action; 187 188 if (!exists) { 189 ret = tcf_idr_create(tn, parm->index, est, a, 190 &act_vlan_ops, bind, true); 191 if (ret) { 192 tcf_idr_cleanup(tn, parm->index); 193 return ret; 194 } 195 196 ret = ACT_P_CREATED; 197 } else if (!ovr) { 198 tcf_idr_release(*a, bind); 199 return -EEXIST; 200 } 201 202 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); 203 if (err < 0) 204 goto release_idr; 205 206 v = to_vlan(*a); 207 208 p = kzalloc(sizeof(*p), GFP_KERNEL); 209 if (!p) { 210 err = -ENOMEM; 211 goto put_chain; 212 } 213 214 p->tcfv_action = action; 215 p->tcfv_push_vid = push_vid; 216 p->tcfv_push_prio = push_prio; 217 p->tcfv_push_proto = push_proto; 218 219 spin_lock_bh(&v->tcf_lock); 220 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); 221 rcu_swap_protected(v->vlan_p, p, lockdep_is_held(&v->tcf_lock)); 222 spin_unlock_bh(&v->tcf_lock); 223 224 if (goto_ch) 225 tcf_chain_put_by_act(goto_ch); 226 if (p) 227 kfree_rcu(p, rcu); 228 229 if (ret == ACT_P_CREATED) 230 tcf_idr_insert(tn, *a); 231 return ret; 232 put_chain: 233 if (goto_ch) 234 tcf_chain_put_by_act(goto_ch); 235 release_idr: 236 tcf_idr_release(*a, bind); 237 return err; 238 } 239 240 static void tcf_vlan_cleanup(struct tc_action *a) 241 { 242 struct tcf_vlan *v = to_vlan(a); 243 struct tcf_vlan_params *p; 244 245 p = rcu_dereference_protected(v->vlan_p, 1); 246 if (p) 247 kfree_rcu(p, rcu); 248 } 249 250 static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a, 251 int bind, int ref) 252 { 253 unsigned char *b = skb_tail_pointer(skb); 254 struct tcf_vlan *v = to_vlan(a); 255 struct tcf_vlan_params *p; 256 struct tc_vlan opt = { 257 .index = v->tcf_index, 258 .refcnt = refcount_read(&v->tcf_refcnt) - ref, 259 .bindcnt = atomic_read(&v->tcf_bindcnt) - bind, 260 }; 261 struct tcf_t t; 262 263 spin_lock_bh(&v->tcf_lock); 264 opt.action = v->tcf_action; 265 p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock)); 266 opt.v_action = p->tcfv_action; 267 if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt)) 268 goto nla_put_failure; 269 270 if ((p->tcfv_action == TCA_VLAN_ACT_PUSH || 271 p->tcfv_action == TCA_VLAN_ACT_MODIFY) && 272 (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) || 273 nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL, 274 p->tcfv_push_proto) || 275 (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY, 276 p->tcfv_push_prio)))) 277 goto nla_put_failure; 278 279 tcf_tm_dump(&t, &v->tcf_tm); 280 if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD)) 281 goto nla_put_failure; 282 spin_unlock_bh(&v->tcf_lock); 283 284 return skb->len; 285 286 nla_put_failure: 287 spin_unlock_bh(&v->tcf_lock); 288 nlmsg_trim(skb, b); 289 return -1; 290 } 291 292 static int tcf_vlan_walker(struct net *net, struct sk_buff *skb, 293 struct netlink_callback *cb, int type, 294 const struct tc_action_ops *ops, 295 struct netlink_ext_ack *extack) 296 { 297 struct tc_action_net *tn = net_generic(net, vlan_net_id); 298 299 return tcf_generic_walker(tn, skb, cb, type, ops, extack); 300 } 301 302 static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index) 303 { 304 struct tc_action_net *tn = net_generic(net, vlan_net_id); 305 306 return tcf_idr_search(tn, a, index); 307 } 308 309 static struct tc_action_ops act_vlan_ops = { 310 .kind = "vlan", 311 .id = TCA_ID_VLAN, 312 .owner = THIS_MODULE, 313 .act = tcf_vlan_act, 314 .dump = tcf_vlan_dump, 315 .init = tcf_vlan_init, 316 .cleanup = tcf_vlan_cleanup, 317 .walk = tcf_vlan_walker, 318 .lookup = tcf_vlan_search, 319 .size = sizeof(struct tcf_vlan), 320 }; 321 322 static __net_init int vlan_init_net(struct net *net) 323 { 324 struct tc_action_net *tn = net_generic(net, vlan_net_id); 325 326 return tc_action_net_init(tn, &act_vlan_ops); 327 } 328 329 static void __net_exit vlan_exit_net(struct list_head *net_list) 330 { 331 tc_action_net_exit(net_list, vlan_net_id); 332 } 333 334 static struct pernet_operations vlan_net_ops = { 335 .init = vlan_init_net, 336 .exit_batch = vlan_exit_net, 337 .id = &vlan_net_id, 338 .size = sizeof(struct tc_action_net), 339 }; 340 341 static int __init vlan_init_module(void) 342 { 343 return tcf_register_action(&act_vlan_ops, &vlan_net_ops); 344 } 345 346 static void __exit vlan_cleanup_module(void) 347 { 348 tcf_unregister_action(&act_vlan_ops, &vlan_net_ops); 349 } 350 351 module_init(vlan_init_module); 352 module_exit(vlan_cleanup_module); 353 354 MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>"); 355 MODULE_DESCRIPTION("vlan manipulation actions"); 356 MODULE_LICENSE("GPL v2"); 357