linux/net/sched/act_vlan.c
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   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
  19static unsigned int vlan_net_id;
  20static struct tc_action_ops act_vlan_ops;
  21
  22static 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        tcf_action_update_bstats(&v->common, 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
  84out:
  85        if (skb_at_tc_ingress(skb))
  86                skb_pull_rcsum(skb, skb->mac_len);
  87
  88        return action;
  89
  90drop:
  91        tcf_action_inc_drop_qstats(&v->common);
  92        return TC_ACT_SHOT;
  93}
  94
  95static 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
 102static 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, u32 flags,
 106                         struct netlink_ext_ack *extack)
 107{
 108        struct tc_action_net *tn = net_generic(net, vlan_net_id);
 109        struct nlattr *tb[TCA_VLAN_MAX + 1];
 110        struct tcf_chain *goto_ch = NULL;
 111        struct tcf_vlan_params *p;
 112        struct tc_vlan *parm;
 113        struct tcf_vlan *v;
 114        int action;
 115        u16 push_vid = 0;
 116        __be16 push_proto = 0;
 117        u8 push_prio = 0;
 118        bool exists = false;
 119        int ret = 0, err;
 120        u32 index;
 121
 122        if (!nla)
 123                return -EINVAL;
 124
 125        err = nla_parse_nested_deprecated(tb, TCA_VLAN_MAX, nla, vlan_policy,
 126                                          NULL);
 127        if (err < 0)
 128                return err;
 129
 130        if (!tb[TCA_VLAN_PARMS])
 131                return -EINVAL;
 132        parm = nla_data(tb[TCA_VLAN_PARMS]);
 133        index = parm->index;
 134        err = tcf_idr_check_alloc(tn, &index, a, bind);
 135        if (err < 0)
 136                return err;
 137        exists = err;
 138        if (exists && bind)
 139                return 0;
 140
 141        switch (parm->v_action) {
 142        case TCA_VLAN_ACT_POP:
 143                break;
 144        case TCA_VLAN_ACT_PUSH:
 145        case TCA_VLAN_ACT_MODIFY:
 146                if (!tb[TCA_VLAN_PUSH_VLAN_ID]) {
 147                        if (exists)
 148                                tcf_idr_release(*a, bind);
 149                        else
 150                                tcf_idr_cleanup(tn, index);
 151                        return -EINVAL;
 152                }
 153                push_vid = nla_get_u16(tb[TCA_VLAN_PUSH_VLAN_ID]);
 154                if (push_vid >= VLAN_VID_MASK) {
 155                        if (exists)
 156                                tcf_idr_release(*a, bind);
 157                        else
 158                                tcf_idr_cleanup(tn, index);
 159                        return -ERANGE;
 160                }
 161
 162                if (tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]) {
 163                        push_proto = nla_get_be16(tb[TCA_VLAN_PUSH_VLAN_PROTOCOL]);
 164                        switch (push_proto) {
 165                        case htons(ETH_P_8021Q):
 166                        case htons(ETH_P_8021AD):
 167                                break;
 168                        default:
 169                                if (exists)
 170                                        tcf_idr_release(*a, bind);
 171                                else
 172                                        tcf_idr_cleanup(tn, index);
 173                                return -EPROTONOSUPPORT;
 174                        }
 175                } else {
 176                        push_proto = htons(ETH_P_8021Q);
 177                }
 178
 179                if (tb[TCA_VLAN_PUSH_VLAN_PRIORITY])
 180                        push_prio = nla_get_u8(tb[TCA_VLAN_PUSH_VLAN_PRIORITY]);
 181                break;
 182        default:
 183                if (exists)
 184                        tcf_idr_release(*a, bind);
 185                else
 186                        tcf_idr_cleanup(tn, index);
 187                return -EINVAL;
 188        }
 189        action = parm->v_action;
 190
 191        if (!exists) {
 192                ret = tcf_idr_create_from_flags(tn, index, est, a,
 193                                                &act_vlan_ops, bind, flags);
 194                if (ret) {
 195                        tcf_idr_cleanup(tn, index);
 196                        return ret;
 197                }
 198
 199                ret = ACT_P_CREATED;
 200        } else if (!ovr) {
 201                tcf_idr_release(*a, bind);
 202                return -EEXIST;
 203        }
 204
 205        err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
 206        if (err < 0)
 207                goto release_idr;
 208
 209        v = to_vlan(*a);
 210
 211        p = kzalloc(sizeof(*p), GFP_KERNEL);
 212        if (!p) {
 213                err = -ENOMEM;
 214                goto put_chain;
 215        }
 216
 217        p->tcfv_action = action;
 218        p->tcfv_push_vid = push_vid;
 219        p->tcfv_push_prio = push_prio;
 220        p->tcfv_push_proto = push_proto;
 221
 222        spin_lock_bh(&v->tcf_lock);
 223        goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
 224        p = rcu_replace_pointer(v->vlan_p, p, lockdep_is_held(&v->tcf_lock));
 225        spin_unlock_bh(&v->tcf_lock);
 226
 227        if (goto_ch)
 228                tcf_chain_put_by_act(goto_ch);
 229        if (p)
 230                kfree_rcu(p, rcu);
 231
 232        if (ret == ACT_P_CREATED)
 233                tcf_idr_insert(tn, *a);
 234        return ret;
 235put_chain:
 236        if (goto_ch)
 237                tcf_chain_put_by_act(goto_ch);
 238release_idr:
 239        tcf_idr_release(*a, bind);
 240        return err;
 241}
 242
 243static void tcf_vlan_cleanup(struct tc_action *a)
 244{
 245        struct tcf_vlan *v = to_vlan(a);
 246        struct tcf_vlan_params *p;
 247
 248        p = rcu_dereference_protected(v->vlan_p, 1);
 249        if (p)
 250                kfree_rcu(p, rcu);
 251}
 252
 253static int tcf_vlan_dump(struct sk_buff *skb, struct tc_action *a,
 254                         int bind, int ref)
 255{
 256        unsigned char *b = skb_tail_pointer(skb);
 257        struct tcf_vlan *v = to_vlan(a);
 258        struct tcf_vlan_params *p;
 259        struct tc_vlan opt = {
 260                .index    = v->tcf_index,
 261                .refcnt   = refcount_read(&v->tcf_refcnt) - ref,
 262                .bindcnt  = atomic_read(&v->tcf_bindcnt) - bind,
 263        };
 264        struct tcf_t t;
 265
 266        spin_lock_bh(&v->tcf_lock);
 267        opt.action = v->tcf_action;
 268        p = rcu_dereference_protected(v->vlan_p, lockdep_is_held(&v->tcf_lock));
 269        opt.v_action = p->tcfv_action;
 270        if (nla_put(skb, TCA_VLAN_PARMS, sizeof(opt), &opt))
 271                goto nla_put_failure;
 272
 273        if ((p->tcfv_action == TCA_VLAN_ACT_PUSH ||
 274             p->tcfv_action == TCA_VLAN_ACT_MODIFY) &&
 275            (nla_put_u16(skb, TCA_VLAN_PUSH_VLAN_ID, p->tcfv_push_vid) ||
 276             nla_put_be16(skb, TCA_VLAN_PUSH_VLAN_PROTOCOL,
 277                          p->tcfv_push_proto) ||
 278             (nla_put_u8(skb, TCA_VLAN_PUSH_VLAN_PRIORITY,
 279                                              p->tcfv_push_prio))))
 280                goto nla_put_failure;
 281
 282        tcf_tm_dump(&t, &v->tcf_tm);
 283        if (nla_put_64bit(skb, TCA_VLAN_TM, sizeof(t), &t, TCA_VLAN_PAD))
 284                goto nla_put_failure;
 285        spin_unlock_bh(&v->tcf_lock);
 286
 287        return skb->len;
 288
 289nla_put_failure:
 290        spin_unlock_bh(&v->tcf_lock);
 291        nlmsg_trim(skb, b);
 292        return -1;
 293}
 294
 295static int tcf_vlan_walker(struct net *net, struct sk_buff *skb,
 296                           struct netlink_callback *cb, int type,
 297                           const struct tc_action_ops *ops,
 298                           struct netlink_ext_ack *extack)
 299{
 300        struct tc_action_net *tn = net_generic(net, vlan_net_id);
 301
 302        return tcf_generic_walker(tn, skb, cb, type, ops, extack);
 303}
 304
 305static void tcf_vlan_stats_update(struct tc_action *a, u64 bytes, u32 packets,
 306                                  u64 lastuse, bool hw)
 307{
 308        struct tcf_vlan *v = to_vlan(a);
 309        struct tcf_t *tm = &v->tcf_tm;
 310
 311        tcf_action_update_stats(a, bytes, packets, false, hw);
 312        tm->lastuse = max_t(u64, tm->lastuse, lastuse);
 313}
 314
 315static int tcf_vlan_search(struct net *net, struct tc_action **a, u32 index)
 316{
 317        struct tc_action_net *tn = net_generic(net, vlan_net_id);
 318
 319        return tcf_idr_search(tn, a, index);
 320}
 321
 322static size_t tcf_vlan_get_fill_size(const struct tc_action *act)
 323{
 324        return nla_total_size(sizeof(struct tc_vlan))
 325                + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_ID */
 326                + nla_total_size(sizeof(u16)) /* TCA_VLAN_PUSH_VLAN_PROTOCOL */
 327                + nla_total_size(sizeof(u8)); /* TCA_VLAN_PUSH_VLAN_PRIORITY */
 328}
 329
 330static struct tc_action_ops act_vlan_ops = {
 331        .kind           =       "vlan",
 332        .id             =       TCA_ID_VLAN,
 333        .owner          =       THIS_MODULE,
 334        .act            =       tcf_vlan_act,
 335        .dump           =       tcf_vlan_dump,
 336        .init           =       tcf_vlan_init,
 337        .cleanup        =       tcf_vlan_cleanup,
 338        .walk           =       tcf_vlan_walker,
 339        .stats_update   =       tcf_vlan_stats_update,
 340        .get_fill_size  =       tcf_vlan_get_fill_size,
 341        .lookup         =       tcf_vlan_search,
 342        .size           =       sizeof(struct tcf_vlan),
 343};
 344
 345static __net_init int vlan_init_net(struct net *net)
 346{
 347        struct tc_action_net *tn = net_generic(net, vlan_net_id);
 348
 349        return tc_action_net_init(net, tn, &act_vlan_ops);
 350}
 351
 352static void __net_exit vlan_exit_net(struct list_head *net_list)
 353{
 354        tc_action_net_exit(net_list, vlan_net_id);
 355}
 356
 357static struct pernet_operations vlan_net_ops = {
 358        .init = vlan_init_net,
 359        .exit_batch = vlan_exit_net,
 360        .id   = &vlan_net_id,
 361        .size = sizeof(struct tc_action_net),
 362};
 363
 364static int __init vlan_init_module(void)
 365{
 366        return tcf_register_action(&act_vlan_ops, &vlan_net_ops);
 367}
 368
 369static void __exit vlan_cleanup_module(void)
 370{
 371        tcf_unregister_action(&act_vlan_ops, &vlan_net_ops);
 372}
 373
 374module_init(vlan_init_module);
 375module_exit(vlan_cleanup_module);
 376
 377MODULE_AUTHOR("Jiri Pirko <jiri@resnulli.us>");
 378MODULE_DESCRIPTION("vlan manipulation actions");
 379MODULE_LICENSE("GPL v2");
 380