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 static struct tc_action_ops act_skbedit_ops;
  34
  35 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
  36                        struct tcf_result *res)
  37 {
  38         struct tcf_skbedit *d = to_skbedit(a);
  39
  40         spin_lock(&d->tcf_lock);
  41         tcf_lastuse_update(&d->tcf_tm);
  42         bstats_update(&d->tcf_bstats, skb);
  43
  44         if (d->flags & SKBEDIT_F_PRIORITY)
  45                 skb->priority = d->priority;
  46         if (d->flags & SKBEDIT_F_QUEUE_MAPPING &&
  47             skb->dev->real_num_tx_queues > d->queue_mapping)
  48                 skb_set_queue_mapping(skb, d->queue_mapping);
  49         if (d->flags & SKBEDIT_F_MARK)
  50                 skb->mark = d->mark;
  51         if (d->flags & SKBEDIT_F_PTYPE)
  52                 skb->pkt_type = d->ptype;
  53
  54         spin_unlock(&d->tcf_lock);
  55         return d->tcf_action;
  56 }
  57
  58 static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
  59         [TCA_SKBEDIT_PARMS]             = { .len = sizeof(struct tc_skbedit) },
  60         [TCA_SKBEDIT_PRIORITY]          = { .len = sizeof(u32) },
  61         [TCA_SKBEDIT_QUEUE_MAPPING]     = { .len = sizeof(u16) },
  62         [TCA_SKBEDIT_MARK]              = { .len = sizeof(u32) },
  63         [TCA_SKBEDIT_PTYPE]             = { .len = sizeof(u16) },
  64 };
  65
  66 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
  67                             struct nlattr *est, struct tc_action **a,
  68                             int ovr, int bind)
  69 {
  70         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
  71         struct nlattr *tb[TCA_SKBEDIT_MAX + 1];
  72         struct tc_skbedit *parm;
  73         struct tcf_skbedit *d;
  74         u32 flags = 0, *priority = NULL, *mark = NULL;
  75         u16 *queue_mapping = NULL, *ptype = NULL;
  76         bool exists = false;
  77         int ret = 0, err;
  78
  79         if (nla == NULL)
  80                 return -EINVAL;
  81
  82         err = nla_parse_nested(tb, TCA_SKBEDIT_MAX, nla, skbedit_policy);
  83         if (err < 0)
  84                 return err;
  85
  86         if (tb[TCA_SKBEDIT_PARMS] == NULL)
  87                 return -EINVAL;
  88
  89         if (tb[TCA_SKBEDIT_PRIORITY] != NULL) {
  90                 flags |= SKBEDIT_F_PRIORITY;
  91                 priority = nla_data(tb[TCA_SKBEDIT_PRIORITY]);
  92         }
  93
  94         if (tb[TCA_SKBEDIT_QUEUE_MAPPING] != NULL) {
  95                 flags |= SKBEDIT_F_QUEUE_MAPPING;
  96                 queue_mapping = nla_data(tb[TCA_SKBEDIT_QUEUE_MAPPING]);
  97         }
  98
  99         if (tb[TCA_SKBEDIT_PTYPE] != NULL) {
 100                 ptype = nla_data(tb[TCA_SKBEDIT_PTYPE]);
 101                 if (!skb_pkt_type_ok(*ptype))
 102                         return -EINVAL;
 103                 flags |= SKBEDIT_F_PTYPE;
 104         }
 105
 106         if (tb[TCA_SKBEDIT_MARK] != NULL) {
 107                 flags |= SKBEDIT_F_MARK;
 108                 mark = nla_data(tb[TCA_SKBEDIT_MARK]);
 109         }
 110
 111         parm = nla_data(tb[TCA_SKBEDIT_PARMS]);
 112
 113         exists = tcf_hash_check(tn, parm->index, a, bind);
 114         if (exists && bind)
 115                 return 0;
 116
 117         if (!flags) {
 118                 tcf_hash_release(*a, bind);
 119                 return -EINVAL;
 120         }
 121
 122         if (!exists) {
 123                 ret = tcf_hash_create(tn, parm->index, est, a,
 124                                       &act_skbedit_ops, bind, false);
 125                 if (ret)
 126                         return ret;
 127
 128                 d = to_skbedit(*a);
 129                 ret = ACT_P_CREATED;
 130         } else {
 131                 d = to_skbedit(*a);
 132                 tcf_hash_release(*a, bind);
 133                 if (!ovr)
 134                         return -EEXIST;
 135         }
 136
 137         spin_lock_bh(&d->tcf_lock);
 138
 139         d->flags = flags;
 140         if (flags & SKBEDIT_F_PRIORITY)
 141                 d->priority = *priority;
 142         if (flags & SKBEDIT_F_QUEUE_MAPPING)
 143                 d->queue_mapping = *queue_mapping;
 144         if (flags & SKBEDIT_F_MARK)
 145                 d->mark = *mark;
 146         if (flags & SKBEDIT_F_PTYPE)
 147                 d->ptype = *ptype;
 148
 149         d->tcf_action = parm->action;
 150
 151         spin_unlock_bh(&d->tcf_lock);
 152
 153         if (ret == ACT_P_CREATED)
 154                 tcf_hash_insert(tn, *a);
 155         return ret;
 156 }
 157
 158 static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
 159                             int bind, int ref)
 160 {
 161         unsigned char *b = skb_tail_pointer(skb);
 162         struct tcf_skbedit *d = to_skbedit(a);
 163         struct tc_skbedit opt = {
 164                 .index   = d->tcf_index,
 165                 .refcnt  = d->tcf_refcnt - ref,
 166                 .bindcnt = d->tcf_bindcnt - bind,
 167                 .action  = d->tcf_action,
 168         };
 169         struct tcf_t t;
 170
 171         if (nla_put(skb, TCA_SKBEDIT_PARMS, sizeof(opt), &opt))
 172                 goto nla_put_failure;
 173         if ((d->flags & SKBEDIT_F_PRIORITY) &&
 174             nla_put_u32(skb, TCA_SKBEDIT_PRIORITY, d->priority))
 175                 goto nla_put_failure;
 176         if ((d->flags & SKBEDIT_F_QUEUE_MAPPING) &&
 177             nla_put_u16(skb, TCA_SKBEDIT_QUEUE_MAPPING, d->queue_mapping))
 178                 goto nla_put_failure;
 179         if ((d->flags & SKBEDIT_F_MARK) &&
 180             nla_put_u32(skb, TCA_SKBEDIT_MARK, d->mark))
 181                 goto nla_put_failure;
 182         if ((d->flags & SKBEDIT_F_PTYPE) &&
 183             nla_put_u16(skb, TCA_SKBEDIT_PTYPE, d->ptype))
 184                 goto nla_put_failure;
 185
 186         tcf_tm_dump(&t, &d->tcf_tm);
 187         if (nla_put_64bit(skb, TCA_SKBEDIT_TM, sizeof(t), &t, TCA_SKBEDIT_PAD))
 188                 goto nla_put_failure;
 189         return skb->len;
 190
 191 nla_put_failure:
 192         nlmsg_trim(skb, b);
 193         return -1;
 194 }
 195
 196 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
 197                               struct netlink_callback *cb, int type,
 198                               const struct tc_action_ops *ops)
 199 {
 200         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 201
 202         return tcf_generic_walker(tn, skb, cb, type, ops);
 203 }
 204
 205 static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
 206 {
 207         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 208
 209         return tcf_hash_search(tn, a, index);
 210 }
 211
 212 static struct tc_action_ops act_skbedit_ops = {
 213         .kind           =       "skbedit",
 214         .type           =       TCA_ACT_SKBEDIT,
 215         .owner          =       THIS_MODULE,
 216         .act            =       tcf_skbedit,
 217         .dump           =       tcf_skbedit_dump,
 218         .init           =       tcf_skbedit_init,
 219         .walk           =       tcf_skbedit_walker,
 220         .lookup         =       tcf_skbedit_search,
 221         .size           =       sizeof(struct tcf_skbedit),
 222 };
 223
 224 static __net_init int skbedit_init_net(struct net *net)
 225 {
 226         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 227
 228         return tc_action_net_init(tn, &act_skbedit_ops, SKBEDIT_TAB_MASK);
 229 }
 230
 231 static void __net_exit skbedit_exit_net(struct net *net)
 232 {
 233         struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 234
 235         tc_action_net_exit(tn);
 236 }
 237
 238 static struct pernet_operations skbedit_net_ops = {
 239         .init = skbedit_init_net,
 240         .exit = skbedit_exit_net,
 241         .id   = &skbedit_net_id,
 242         .size = sizeof(struct tc_action_net),
 243 };
 244
 245 MODULE_AUTHOR("Alexander Duyck, <alexander.h.duyck@intel.com>");
 246 MODULE_DESCRIPTION("SKB Editing");
 247 MODULE_LICENSE("GPL");
 248
 249 static int __init skbedit_init_module(void)
 250 {
 251         return tcf_register_action(&act_skbedit_ops, &skbedit_net_ops);
 252 }
 253
 254 static void __exit skbedit_cleanup_module(void)
 255 {
 256         tcf_unregister_action(&act_skbedit_ops, &skbedit_net_ops);
 257 }
 258
 259 module_init(skbedit_init_module);
 260 module_exit(skbedit_cleanup_module);