Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * net/sched/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 | ||
1da177e4 LT |
15 | #include <linux/types.h> |
16 | #include <linux/kernel.h> | |
1da177e4 | 17 | #include <linux/string.h> |
1da177e4 | 18 | #include <linux/errno.h> |
1da177e4 LT |
19 | #include <linux/skbuff.h> |
20 | #include <linux/rtnetlink.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/init.h> | |
881d966b | 23 | #include <net/net_namespace.h> |
dc5fc579 | 24 | #include <net/netlink.h> |
1da177e4 LT |
25 | #include <net/pkt_sched.h> |
26 | #include <linux/tc_act/tc_mirred.h> | |
27 | #include <net/tc_act/tc_mirred.h> | |
28 | ||
1da177e4 LT |
29 | #include <linux/if_arp.h> |
30 | ||
e9ce1cd3 DM |
31 | #define MIRRED_TAB_MASK 7 |
32 | static struct tcf_common *tcf_mirred_ht[MIRRED_TAB_MASK + 1]; | |
33 | static u32 mirred_idx_gen; | |
1da177e4 LT |
34 | static DEFINE_RWLOCK(mirred_lock); |
35 | ||
e9ce1cd3 DM |
36 | static struct tcf_hashinfo mirred_hash_info = { |
37 | .htab = tcf_mirred_ht, | |
38 | .hmask = MIRRED_TAB_MASK, | |
39 | .lock = &mirred_lock, | |
40 | }; | |
1da177e4 | 41 | |
e9ce1cd3 | 42 | static inline int tcf_mirred_release(struct tcf_mirred *m, int bind) |
1da177e4 | 43 | { |
e9ce1cd3 | 44 | if (m) { |
1da177e4 | 45 | if (bind) |
e9ce1cd3 DM |
46 | m->tcf_bindcnt--; |
47 | m->tcf_refcnt--; | |
48 | if(!m->tcf_bindcnt && m->tcf_refcnt <= 0) { | |
49 | dev_put(m->tcfm_dev); | |
50 | tcf_hash_destroy(&m->common, &mirred_hash_info); | |
1da177e4 LT |
51 | return 1; |
52 | } | |
53 | } | |
54 | return 0; | |
55 | } | |
56 | ||
53b2bf3f PM |
57 | static const struct nla_policy mirred_policy[TCA_MIRRED_MAX + 1] = { |
58 | [TCA_MIRRED_PARMS] = { .len = sizeof(struct tc_mirred) }, | |
59 | }; | |
60 | ||
7ba699c6 | 61 | static int tcf_mirred_init(struct nlattr *nla, struct nlattr *est, |
e9ce1cd3 | 62 | struct tc_action *a, int ovr, int bind) |
1da177e4 | 63 | { |
7ba699c6 | 64 | struct nlattr *tb[TCA_MIRRED_MAX + 1]; |
1da177e4 | 65 | struct tc_mirred *parm; |
e9ce1cd3 DM |
66 | struct tcf_mirred *m; |
67 | struct tcf_common *pc; | |
1da177e4 | 68 | struct net_device *dev = NULL; |
cee63723 | 69 | int ret = 0, err; |
1da177e4 LT |
70 | int ok_push = 0; |
71 | ||
cee63723 | 72 | if (nla == NULL) |
1da177e4 LT |
73 | return -EINVAL; |
74 | ||
53b2bf3f | 75 | err = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy); |
cee63723 PM |
76 | if (err < 0) |
77 | return err; | |
78 | ||
53b2bf3f | 79 | if (tb[TCA_MIRRED_PARMS] == NULL) |
1da177e4 | 80 | return -EINVAL; |
7ba699c6 | 81 | parm = nla_data(tb[TCA_MIRRED_PARMS]); |
1da177e4 LT |
82 | |
83 | if (parm->ifindex) { | |
881d966b | 84 | dev = __dev_get_by_index(&init_net, parm->ifindex); |
1da177e4 LT |
85 | if (dev == NULL) |
86 | return -ENODEV; | |
87 | switch (dev->type) { | |
88 | case ARPHRD_TUNNEL: | |
89 | case ARPHRD_TUNNEL6: | |
90 | case ARPHRD_SIT: | |
91 | case ARPHRD_IPGRE: | |
92 | case ARPHRD_VOID: | |
93 | case ARPHRD_NONE: | |
94 | ok_push = 0; | |
95 | break; | |
96 | default: | |
97 | ok_push = 1; | |
98 | break; | |
99 | } | |
100 | } | |
101 | ||
e9ce1cd3 DM |
102 | pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info); |
103 | if (!pc) { | |
1da177e4 LT |
104 | if (!parm->ifindex) |
105 | return -EINVAL; | |
e9ce1cd3 DM |
106 | pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind, |
107 | &mirred_idx_gen, &mirred_hash_info); | |
0e991ec6 SH |
108 | if (IS_ERR(pc)) |
109 | return PTR_ERR(pc); | |
1da177e4 LT |
110 | ret = ACT_P_CREATED; |
111 | } else { | |
112 | if (!ovr) { | |
e9ce1cd3 | 113 | tcf_mirred_release(to_mirred(pc), bind); |
1da177e4 LT |
114 | return -EEXIST; |
115 | } | |
116 | } | |
e9ce1cd3 | 117 | m = to_mirred(pc); |
1da177e4 | 118 | |
e9ce1cd3 DM |
119 | spin_lock_bh(&m->tcf_lock); |
120 | m->tcf_action = parm->action; | |
121 | m->tcfm_eaction = parm->eaction; | |
1da177e4 | 122 | if (parm->ifindex) { |
e9ce1cd3 | 123 | m->tcfm_ifindex = parm->ifindex; |
1da177e4 | 124 | if (ret != ACT_P_CREATED) |
e9ce1cd3 DM |
125 | dev_put(m->tcfm_dev); |
126 | m->tcfm_dev = dev; | |
1da177e4 | 127 | dev_hold(dev); |
e9ce1cd3 | 128 | m->tcfm_ok_push = ok_push; |
1da177e4 | 129 | } |
e9ce1cd3 | 130 | spin_unlock_bh(&m->tcf_lock); |
1da177e4 | 131 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 132 | tcf_hash_insert(pc, &mirred_hash_info); |
1da177e4 | 133 | |
1da177e4 LT |
134 | return ret; |
135 | } | |
136 | ||
e9ce1cd3 | 137 | static int tcf_mirred_cleanup(struct tc_action *a, int bind) |
1da177e4 | 138 | { |
e9ce1cd3 | 139 | struct tcf_mirred *m = a->priv; |
1da177e4 | 140 | |
e9ce1cd3 DM |
141 | if (m) |
142 | return tcf_mirred_release(m, bind); | |
1da177e4 LT |
143 | return 0; |
144 | } | |
145 | ||
e9ce1cd3 DM |
146 | static int tcf_mirred(struct sk_buff *skb, struct tc_action *a, |
147 | struct tcf_result *res) | |
1da177e4 | 148 | { |
e9ce1cd3 | 149 | struct tcf_mirred *m = a->priv; |
1da177e4 LT |
150 | struct net_device *dev; |
151 | struct sk_buff *skb2 = NULL; | |
1da177e4 LT |
152 | u32 at = G_TC_AT(skb->tc_verd); |
153 | ||
e9ce1cd3 | 154 | spin_lock(&m->tcf_lock); |
1da177e4 | 155 | |
e9ce1cd3 DM |
156 | dev = m->tcfm_dev; |
157 | m->tcf_tm.lastuse = jiffies; | |
1da177e4 LT |
158 | |
159 | if (!(dev->flags&IFF_UP) ) { | |
160 | if (net_ratelimit()) | |
161 | printk("mirred to Houston: device %s is gone!\n", | |
162 | dev->name); | |
163 | bad_mirred: | |
164 | if (skb2 != NULL) | |
165 | kfree_skb(skb2); | |
e9ce1cd3 | 166 | m->tcf_qstats.overlimits++; |
0abf77e5 | 167 | m->tcf_bstats.bytes += qdisc_pkt_len(skb); |
e9ce1cd3 DM |
168 | m->tcf_bstats.packets++; |
169 | spin_unlock(&m->tcf_lock); | |
1da177e4 LT |
170 | /* should we be asking for packet to be dropped? |
171 | * may make sense for redirect case only | |
172 | */ | |
173 | return TC_ACT_SHOT; | |
174 | } | |
175 | ||
a057ae3c | 176 | skb2 = skb_act_clone(skb, GFP_ATOMIC); |
1da177e4 LT |
177 | if (skb2 == NULL) |
178 | goto bad_mirred; | |
e9ce1cd3 DM |
179 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR && |
180 | m->tcfm_eaction != TCA_EGRESS_REDIR) { | |
1da177e4 | 181 | if (net_ratelimit()) |
e9ce1cd3 DM |
182 | printk("tcf_mirred unknown action %d\n", |
183 | m->tcfm_eaction); | |
1da177e4 LT |
184 | goto bad_mirred; |
185 | } | |
186 | ||
0abf77e5 | 187 | m->tcf_bstats.bytes += qdisc_pkt_len(skb2); |
e9ce1cd3 | 188 | m->tcf_bstats.packets++; |
1da177e4 | 189 | if (!(at & AT_EGRESS)) |
e9ce1cd3 | 190 | if (m->tcfm_ok_push) |
1da177e4 LT |
191 | skb_push(skb2, skb2->dev->hard_header_len); |
192 | ||
193 | /* mirror is always swallowed */ | |
e9ce1cd3 | 194 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR) |
1da177e4 LT |
195 | skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at); |
196 | ||
197 | skb2->dev = dev; | |
c01003c2 | 198 | skb2->iif = skb->dev->ifindex; |
1da177e4 | 199 | dev_queue_xmit(skb2); |
e9ce1cd3 DM |
200 | spin_unlock(&m->tcf_lock); |
201 | return m->tcf_action; | |
1da177e4 LT |
202 | } |
203 | ||
e9ce1cd3 | 204 | static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 205 | { |
27a884dc | 206 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 207 | struct tcf_mirred *m = a->priv; |
1da177e4 | 208 | struct tc_mirred opt; |
1da177e4 LT |
209 | struct tcf_t t; |
210 | ||
e9ce1cd3 DM |
211 | opt.index = m->tcf_index; |
212 | opt.action = m->tcf_action; | |
213 | opt.refcnt = m->tcf_refcnt - ref; | |
214 | opt.bindcnt = m->tcf_bindcnt - bind; | |
215 | opt.eaction = m->tcfm_eaction; | |
216 | opt.ifindex = m->tcfm_ifindex; | |
7ba699c6 | 217 | NLA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt); |
e9ce1cd3 DM |
218 | t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install); |
219 | t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse); | |
220 | t.expires = jiffies_to_clock_t(m->tcf_tm.expires); | |
7ba699c6 | 221 | NLA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t); |
1da177e4 LT |
222 | return skb->len; |
223 | ||
7ba699c6 | 224 | nla_put_failure: |
dc5fc579 | 225 | nlmsg_trim(skb, b); |
1da177e4 LT |
226 | return -1; |
227 | } | |
228 | ||
229 | static struct tc_action_ops act_mirred_ops = { | |
230 | .kind = "mirred", | |
e9ce1cd3 | 231 | .hinfo = &mirred_hash_info, |
1da177e4 LT |
232 | .type = TCA_ACT_MIRRED, |
233 | .capab = TCA_CAP_NONE, | |
234 | .owner = THIS_MODULE, | |
235 | .act = tcf_mirred, | |
236 | .dump = tcf_mirred_dump, | |
237 | .cleanup = tcf_mirred_cleanup, | |
238 | .lookup = tcf_hash_search, | |
239 | .init = tcf_mirred_init, | |
240 | .walk = tcf_generic_walker | |
241 | }; | |
242 | ||
243 | MODULE_AUTHOR("Jamal Hadi Salim(2002)"); | |
244 | MODULE_DESCRIPTION("Device Mirror/redirect actions"); | |
245 | MODULE_LICENSE("GPL"); | |
246 | ||
e9ce1cd3 | 247 | static int __init mirred_init_module(void) |
1da177e4 LT |
248 | { |
249 | printk("Mirror/redirect action on\n"); | |
250 | return tcf_register_action(&act_mirred_ops); | |
251 | } | |
252 | ||
e9ce1cd3 | 253 | static void __exit mirred_cleanup_module(void) |
1da177e4 LT |
254 | { |
255 | tcf_unregister_action(&act_mirred_ops); | |
256 | } | |
257 | ||
258 | module_init(mirred_init_module); | |
259 | module_exit(mirred_cleanup_module); |