~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/sched/act_mirred.c

Version: ~ [ linux-5.13-rc7 ] ~ [ linux-5.12.12 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.45 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.127 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.195 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.237 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.273 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.273 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  * net/sched/act_mirred.c       packet mirroring and redirect actions
  3  *
  4  *              This program is free software; you can redistribute it and/or
  5  *              modify it under the terms of the GNU General Public License
  6  *              as published by the Free Software Foundation; either version
  7  *              2 of the License, or (at your option) any later version.
  8  *
  9  * Authors:     Jamal Hadi Salim (2002-4)
 10  *
 11  * TODO: Add ingress support (and socket redirect support)
 12  *
 13  */
 14 
 15 #include <linux/types.h>
 16 #include <linux/kernel.h>
 17 #include <linux/string.h>
 18 #include <linux/errno.h>
 19 #include <linux/skbuff.h>
 20 #include <linux/rtnetlink.h>
 21 #include <linux/module.h>
 22 #include <linux/init.h>
 23 #include <linux/gfp.h>
 24 #include <net/net_namespace.h>
 25 #include <net/netlink.h>
 26 #include <net/pkt_sched.h>
 27 #include <linux/tc_act/tc_mirred.h>
 28 #include <net/tc_act/tc_mirred.h>
 29 
 30 #include <linux/if_arp.h>
 31 
 32 #define MIRRED_TAB_MASK     7
 33 static LIST_HEAD(mirred_list);
 34 
 35 static void tcf_mirred_release(struct tc_action *a, int bind)
 36 {
 37         struct tcf_mirred *m = to_mirred(a);
 38         list_del(&m->tcfm_list);
 39         if (m->tcfm_dev)
 40                 dev_put(m->tcfm_dev);
 41 }
 42 
 43 static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = {
 44         [TCA_MIRRED_PARMS]      = { .len = sizeof(struct tc_mirred) },
 45 };
 46 
 47 static int tcf_mirred_init(struct net *net, struct nlattr *nla,
 48                            struct nlattr *est, struct tc_action *a, int ovr,
 49                            int bind)
 50 {
 51         struct nlattr *tb[TCA_MIRRED_MAX + 1];
 52         struct tc_mirred *parm;
 53         struct tcf_mirred *m;
 54         struct net_device *dev;
 55         int ret, ok_push = 0;
 56 
 57         if (nla == NULL)
 58                 return -EINVAL;
 59         ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
 60         if (ret < 0)
 61                 return ret;
 62         if (tb[TCA_MIRRED_PARMS] == NULL)
 63                 return -EINVAL;
 64         parm = nla_data(tb[TCA_MIRRED_PARMS]);
 65         switch (parm->eaction) {
 66         case TCA_EGRESS_MIRROR:
 67         case TCA_EGRESS_REDIR:
 68                 break;
 69         default:
 70                 return -EINVAL;
 71         }
 72         if (parm->ifindex) {
 73                 dev = __dev_get_by_index(net, parm->ifindex);
 74                 if (dev == NULL)
 75                         return -ENODEV;
 76                 switch (dev->type) {
 77                 case ARPHRD_TUNNEL:
 78                 case ARPHRD_TUNNEL6:
 79                 case ARPHRD_SIT:
 80                 case ARPHRD_IPGRE:
 81                 case ARPHRD_VOID:
 82                 case ARPHRD_NONE:
 83                         ok_push = 0;
 84                         break;
 85                 default:
 86                         ok_push = 1;
 87                         break;
 88                 }
 89         } else {
 90                 dev = NULL;
 91         }
 92 
 93         if (!tcf_hash_check(parm->index, a, bind)) {
 94                 if (dev == NULL)
 95                         return -EINVAL;
 96                 ret = tcf_hash_create(parm->index, est, a, sizeof(*m), bind);
 97                 if (ret)
 98                         return ret;
 99                 ret = ACT_P_CREATED;
100         } else {
101                 if (bind)
102                         return 0;
103                 if (!ovr) {
104                         tcf_hash_release(a, bind);
105                         return -EEXIST;
106                 }
107         }
108         m = to_mirred(a);
109 
110         spin_lock_bh(&m->tcf_lock);
111         m->tcf_action = parm->action;
112         m->tcfm_eaction = parm->eaction;
113         if (dev != NULL) {
114                 m->tcfm_ifindex = parm->ifindex;
115                 if (ret != ACT_P_CREATED)
116                         dev_put(m->tcfm_dev);
117                 dev_hold(dev);
118                 m->tcfm_dev = dev;
119                 m->tcfm_ok_push = ok_push;
120         }
121         spin_unlock_bh(&m->tcf_lock);
122         if (ret == ACT_P_CREATED) {
123                 list_add(&m->tcfm_list, &mirred_list);
124                 tcf_hash_insert(a);
125         }
126 
127         return ret;
128 }
129 
130 static int tcf_mirred(struct sk_buff *skb, const struct tc_action *a,
131                       struct tcf_result *res)
132 {
133         struct tcf_mirred *m = a->priv;
134         struct net_device *dev;
135         struct sk_buff *skb2;
136         u32 at;
137         int retval, err = 1;
138 
139         spin_lock(&m->tcf_lock);
140         m->tcf_tm.lastuse = jiffies;
141         bstats_update(&m->tcf_bstats, skb);
142 
143         dev = m->tcfm_dev;
144         if (!dev) {
145                 printk_once(KERN_NOTICE "tc mirred: target device is gone\n");
146                 goto out;
147         }
148 
149         if (!(dev->flags & IFF_UP)) {
150                 net_notice_ratelimited("tc mirred to Houston: device %s is down\n",
151                                        dev->name);
152                 goto out;
153         }
154 
155         at = G_TC_AT(skb->tc_verd);
156         skb2 = skb_clone(skb, GFP_ATOMIC);
157         if (skb2 == NULL)
158                 goto out;
159 
160         if (!(at & AT_EGRESS)) {
161                 if (m->tcfm_ok_push)
162                         skb_push(skb2, skb->mac_len);
163         }
164 
165         /* mirror is always swallowed */
166         if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
167                 skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
168 
169         skb2->skb_iif = skb->dev->ifindex;
170         skb2->dev = dev;
171         skb_sender_cpu_clear(skb2);
172         err = dev_queue_xmit(skb2);
173 
174 out:
175         if (err) {
176                 m->tcf_qstats.overlimits++;
177                 if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
178                         retval = TC_ACT_SHOT;
179                 else
180                         retval = m->tcf_action;
181         } else
182                 retval = m->tcf_action;
183         spin_unlock(&m->tcf_lock);
184 
185         return retval;
186 }
187 
188 static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
189 {
190         unsigned char *b = skb_tail_pointer(skb);
191         struct tcf_mirred *m = a->priv;
192         struct tc_mirred opt = {
193                 .index   = m->tcf_index,
194                 .action  = m->tcf_action,
195                 .refcnt  = m->tcf_refcnt - ref,
196                 .bindcnt = m->tcf_bindcnt - bind,
197                 .eaction = m->tcfm_eaction,
198                 .ifindex = m->tcfm_ifindex,
199         };
200         struct tcf_t t;
201 
202         if (nla_put(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt))
203                 goto nla_put_failure;
204         t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install);
205         t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse);
206         t.expires = jiffies_to_clock_t(m->tcf_tm.expires);
207         if (nla_put(skb, TCA_MIRRED_TM, sizeof(t), &t))
208                 goto nla_put_failure;
209         return skb->len;
210 
211 nla_put_failure:
212         nlmsg_trim(skb, b);
213         return -1;
214 }
215 
216 static int mirred_device_event(struct notifier_block *unused,
217                                unsigned long event, void *ptr)
218 {
219         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
220         struct tcf_mirred *m;
221 
222         if (event == NETDEV_UNREGISTER)
223                 list_for_each_entry(m, &mirred_list, tcfm_list) {
224                         spin_lock_bh(&m->tcf_lock);
225                         if (m->tcfm_dev == dev) {
226                                 dev_put(dev);
227                                 m->tcfm_dev = NULL;
228                         }
229                         spin_unlock_bh(&m->tcf_lock);
230                 }
231 
232         return NOTIFY_DONE;
233 }
234 
235 static struct notifier_block mirred_device_notifier = {
236         .notifier_call = mirred_device_event,
237 };
238 
239 static struct tc_action_ops act_mirred_ops = {
240         .kind           =       "mirred",
241         .type           =       TCA_ACT_MIRRED,
242         .owner          =       THIS_MODULE,
243         .act            =       tcf_mirred,
244         .dump           =       tcf_mirred_dump,
245         .cleanup        =       tcf_mirred_release,
246         .init           =       tcf_mirred_init,
247 };
248 
249 MODULE_AUTHOR("Jamal Hadi Salim(2002)");
250 MODULE_DESCRIPTION("Device Mirror/redirect actions");
251 MODULE_LICENSE("GPL");
252 
253 static int __init mirred_init_module(void)
254 {
255         int err = register_netdevice_notifier(&mirred_device_notifier);
256         if (err)
257                 return err;
258 
259         pr_info("Mirror/redirect action on\n");
260         return tcf_register_action(&act_mirred_ops, MIRRED_TAB_MASK);
261 }
262 
263 static void __exit mirred_cleanup_module(void)
264 {
265         tcf_unregister_action(&act_mirred_ops);
266         unregister_netdevice_notifier(&mirred_device_notifier);
267 }
268 
269 module_init(mirred_init_module);
270 module_exit(mirred_cleanup_module);
271 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp