net/sched/act_skbedit.c

   1 /*
   2  * Copyright (c) 2008, Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, see <http://www.gnu.org/licenses/>.
  15  *
  16  * Author: Alexander Duyck <alexander.h.duyck@intel.com>
  17  */
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/rtnetlink.h>
  24 #include <net/netlink.h>
  25 #include <net/pkt_sched.h>
  26
  27 #include <linux/tc_act/tc_skbedit.h>
  28 #include <net/tc_act/tc_skbedit.h>
  29
  30 #define SKBEDIT_TAB_MASK     15
  31
  32 static int skbedit_net_id;
  33
  34 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
  35                        struct tcf_result *res)
  36 {
  37         struct tcf_skbedit *d = a->priv;
  38
  39         spin_lock(&d->tcf_lock);
  40         tcf_lastuse_update(&d->tcf_tm);
  41         bstats_update(&d->tcf_bstats, skb);
  42
  43         if (d->flags & SKBEDIT_F_PRIORITY)
  44                 skb->priority = d->priority;
  45         if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
  46             skb->dev->real_num_tx_queues > d->queue_mapping)
  47                 skb_set_queue_mapping(skb, d->queue_mapping);
  48         if (d->flags & SKBEDIT_F_MARK)
  49                 skb->mark = d->mark;
  50         if (d->flags & SKBEDIT_F_PTYPE)
  51                 skb->pkt_type = d->ptype;
  52
  53         spin_unlock(&d->tcf_lock);
  54         return d->tcf_action;
  55 }
  56
  57 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
  58         [TCA_SKBEDIT_PARMS]             = { .len = sizeof(struct tc_skbedit) },
  59         [TCA_SKBEDIT_PRIORITY]          = { .len = sizeof(u32) },
  60         [TCA_SKBEDIT_QUEUE_MAPPING]     = { .len = sizeof(u16) },
  61         [TCA_SKBEDIT_MARK]              = { .len = sizeof(u32) },
  62         [TCA_SKBEDIT_PTYPE]             = { .len = sizeof(u16) },
  63 };
  64
  65 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
  66                             struct nlattr *est, struct tc_action *a,
  67                             int ovr, int bind)
  68 {
  69         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
  70         struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
  71         struct tc_skbedit *parm;
  72         struct tcf_skbedit *d;
  73         u32 flags = 0, *priority = NULL, *mark = NULL;
  74         u16 *queue_mapping = NULL, *ptype = NULL;
  75         bool exists = false;
  76         int ret = 0, err;
  77
  78         if (nla == NULL)
  79                 return -EINVAL;
  80
  81         err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
  82         if (err < 0)
  83                 return err;
  84
  85         if (tb[TCA_SKBEDIT_PARMS] == NULL)
  86                 return -EINVAL;
  87
  88         if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
  89                 flags |= SKBEDIT_F_PRIORITY;
  90                 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
  91         }
  92
  93         if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
  94                 flags |= SKBEDIT_F_QUEUE_MAPPING;
  95                 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
  96         }
  97
  98         if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
  99                 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
 100                 if (!skb_pkt_type_ok(*ptype))
 101                         return -EINVAL;
 102                 flags |= SKBEDIT_F_PTYPE;
 103         }
 104
 105         if (tb[TCA_SKBEDIT_MARK] != NULL) {
 106                 flags |= SKBEDIT_F_MARK;
 107                 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
 108         }
 109
 110         parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
 111
 112         exists = tcf_hash_check(tn, parm->index, a, bind);
 113         if (exists && bind)
 114                 return 0;
 115
 116         if (!flags) {
 117                 tcf_hash_release(a, bind);
 118                 return -EINVAL;
 119         }
 120
 121         if (!exists) {
 122                 ret = tcf_hash_create(tn, parm->index, est, a,
 123                                       sizeof(*d), bind, false);
 124                 if (ret)
 125                         return ret;
 126
 127                 d = to_skbedit(a);
 128                 ret = ACT_P_CREATED;
 129         } else {
 130                 d = to_skbedit(a);
 131                 tcf_hash_release(a, bind);
 132                 if (!ovr)
 133                         return -EEXIST;
 134         }
 135
 136         spin_lock_bh(&d->tcf_lock);
 137
 138         d->flags = flags;
 139         if (flags & SKBEDIT_F_PRIORITY)
 140                 d->priority = *priority;
 141         if (flags & SKBEDIT_F_QUEUE_MAPPING)
 142                 d->queue_mapping = *queue_mapping;
 143         if (flags & SKBEDIT_F_MARK)
 144                 d->mark = *mark;
 145         if (flags & SKBEDIT_F_PTYPE)
 146                 d->ptype = *ptype;
 147
 148         d->tcf_action = parm->action;
 149
 150         spin_unlock_bh(&d->tcf_lock);
 151
 152         if (ret == ACT_P_CREATED)
 153                 tcf_hash_insert(tn, a);
 154         return ret;
 155 }
 156
 157 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
 158                             int bind, int ref)
 159 {
 160         unsigned char *b = skb_tail_pointer(skb);
 161         struct tcf_skbedit *d = a->priv;
 162         struct tc_skbedit opt = {
 163                 .index   = d->tcf_index,
 164                 .refcnt  = d->tcf_refcnt - ref,
 165                 .bindcnt = d->tcf_bindcnt - bind,
 166                 .action  = d->tcf_action,
 167         };
 168         struct tcf_t t;
 169
 170         if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
 171                 goto nla_put_failure;
 172         if ((d->flags & SKBEDIT_F_PRIORITY) &&
 173             nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority))
 174                 goto nla_put_failure;
 175         if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) &&
 176             nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping))
 177                 goto nla_put_failure;
 178         if ((d->flags & SKBEDIT_F_MARK) &&
 179             nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark))
 180                 goto nla_put_failure;
 181         if ((d->flags & SKBEDIT_F_PTYPE) &&
 182             nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype))
 183                 goto nla_put_failure;
 184
 185         tcf_tm_dump(&t, &d->tcf_tm);
 186         if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
 187                 goto nla_put_failure;
 188         return skb->len;
 189
 190 nla_put_failure:
 191         nlmsg_trim(skb, b);
 192         return -1;
 193 }
 194
 195 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
 196                               struct netlink_callback *cb, int type,
 197                               struct tc_action *a)
 198 {
 199         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 200
 201         return tcf_generic_walker(tn, skb, cb, type, a);
 202 }
 203
 204 static int tcf_skbedit_search(struct net *net, struct tc_action *a, u32 index)
 205 {
 206         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 207
 208         return tcf_hash_search(tn, a, index);
 209 }
 210
 211 static struct tc_action_ops act_skbedit_ops = {
 212         .kind           =       "skbedit",
 213         .type           =       TCA_ACT_SKBEDIT,
 214         .owner          =       THIS_MODULE,
 215         .act            =       tcf_skbedit,
 216         .dump           =       tcf_skbedit_dump,
 217         .init           =       tcf_skbedit_init,
 218         .walk           =       tcf_skbedit_walker,
 219         .lookup         =       tcf_skbedit_search,
 220 };
 221
 222 static __net_init int skbedit_init_net(struct net *net)
 223 {
 224         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 225
 226         return tc_action_net_init(tn, &act_skbedit_ops, SKBEDIT_TAB_MASK);
 227 }
 228
 229 static void __net_exit skbedit_exit_net(struct net *net)
 230 {
 231         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 232
 233         tc_action_net_exit(tn);
 234 }
 235
 236 static struct pernet_operations skbedit_net_ops = {
 237         .init = skbedit_init_net,
 238         .exit = skbedit_exit_net,
 239         .id   = &skbedit_net_id,
 240         .size = sizeof(struct tc_action_net),
 241 };
 242
 243 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
 244 MODULE_DESCRIPTION("SKB Editing");
 245 MODULE_LICENSE("GPL");
 246
 247 static int __init skbedit_init_module(void)
 248 {
 249         return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
 250 }
 251
 252 static void __exit skbedit_cleanup_module(void)
 253 {
 254         tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
 255 }
 256
 257 module_init(skbedit_init_module);
 258 module_exit(skbedit_cleanup_module);