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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 | ||
e9ce1cd3 DM |
57 | static int tcf_mirred_init(struct rtattr *rta, struct rtattr *est, |
58 | struct tc_action *a, int ovr, int bind) | |
1da177e4 LT |
59 | { |
60 | struct rtattr *tb[TCA_MIRRED_MAX]; | |
61 | struct tc_mirred *parm; | |
e9ce1cd3 DM |
62 | struct tcf_mirred *m; |
63 | struct tcf_common *pc; | |
1da177e4 LT |
64 | struct net_device *dev = NULL; |
65 | int ret = 0; | |
66 | int ok_push = 0; | |
67 | ||
68 | if (rta == NULL || rtattr_parse_nested(tb, TCA_MIRRED_MAX, rta) < 0) | |
69 | return -EINVAL; | |
70 | ||
71 | if (tb[TCA_MIRRED_PARMS-1] == NULL || | |
72 | RTA_PAYLOAD(tb[TCA_MIRRED_PARMS-1]) < sizeof(*parm)) | |
73 | return -EINVAL; | |
74 | parm = RTA_DATA(tb[TCA_MIRRED_PARMS-1]); | |
75 | ||
76 | if (parm->ifindex) { | |
881d966b | 77 | dev = __dev_get_by_index(&init_net, parm->ifindex); |
1da177e4 LT |
78 | if (dev == NULL) |
79 | return -ENODEV; | |
80 | switch (dev->type) { | |
81 | case ARPHRD_TUNNEL: | |
82 | case ARPHRD_TUNNEL6: | |
83 | case ARPHRD_SIT: | |
84 | case ARPHRD_IPGRE: | |
85 | case ARPHRD_VOID: | |
86 | case ARPHRD_NONE: | |
87 | ok_push = 0; | |
88 | break; | |
89 | default: | |
90 | ok_push = 1; | |
91 | break; | |
92 | } | |
93 | } | |
94 | ||
e9ce1cd3 DM |
95 | pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info); |
96 | if (!pc) { | |
1da177e4 LT |
97 | if (!parm->ifindex) |
98 | return -EINVAL; | |
e9ce1cd3 DM |
99 | pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind, |
100 | &mirred_idx_gen, &mirred_hash_info); | |
101 | if (unlikely(!pc)) | |
1da177e4 LT |
102 | return -ENOMEM; |
103 | ret = ACT_P_CREATED; | |
104 | } else { | |
105 | if (!ovr) { | |
e9ce1cd3 | 106 | tcf_mirred_release(to_mirred(pc), bind); |
1da177e4 LT |
107 | return -EEXIST; |
108 | } | |
109 | } | |
e9ce1cd3 | 110 | m = to_mirred(pc); |
1da177e4 | 111 | |
e9ce1cd3 DM |
112 | spin_lock_bh(&m->tcf_lock); |
113 | m->tcf_action = parm->action; | |
114 | m->tcfm_eaction = parm->eaction; | |
1da177e4 | 115 | if (parm->ifindex) { |
e9ce1cd3 | 116 | m->tcfm_ifindex = parm->ifindex; |
1da177e4 | 117 | if (ret != ACT_P_CREATED) |
e9ce1cd3 DM |
118 | dev_put(m->tcfm_dev); |
119 | m->tcfm_dev = dev; | |
1da177e4 | 120 | dev_hold(dev); |
e9ce1cd3 | 121 | m->tcfm_ok_push = ok_push; |
1da177e4 | 122 | } |
e9ce1cd3 | 123 | spin_unlock_bh(&m->tcf_lock); |
1da177e4 | 124 | if (ret == ACT_P_CREATED) |
e9ce1cd3 | 125 | tcf_hash_insert(pc, &mirred_hash_info); |
1da177e4 | 126 | |
1da177e4 LT |
127 | return ret; |
128 | } | |
129 | ||
e9ce1cd3 | 130 | static int tcf_mirred_cleanup(struct tc_action *a, int bind) |
1da177e4 | 131 | { |
e9ce1cd3 | 132 | struct tcf_mirred *m = a->priv; |
1da177e4 | 133 | |
e9ce1cd3 DM |
134 | if (m) |
135 | return tcf_mirred_release(m, bind); | |
1da177e4 LT |
136 | return 0; |
137 | } | |
138 | ||
e9ce1cd3 DM |
139 | static int tcf_mirred(struct sk_buff *skb, struct tc_action *a, |
140 | struct tcf_result *res) | |
1da177e4 | 141 | { |
e9ce1cd3 | 142 | struct tcf_mirred *m = a->priv; |
1da177e4 LT |
143 | struct net_device *dev; |
144 | struct sk_buff *skb2 = NULL; | |
1da177e4 LT |
145 | u32 at = G_TC_AT(skb->tc_verd); |
146 | ||
e9ce1cd3 | 147 | spin_lock(&m->tcf_lock); |
1da177e4 | 148 | |
e9ce1cd3 DM |
149 | dev = m->tcfm_dev; |
150 | m->tcf_tm.lastuse = jiffies; | |
1da177e4 LT |
151 | |
152 | if (!(dev->flags&IFF_UP) ) { | |
153 | if (net_ratelimit()) | |
154 | printk("mirred to Houston: device %s is gone!\n", | |
155 | dev->name); | |
156 | bad_mirred: | |
157 | if (skb2 != NULL) | |
158 | kfree_skb(skb2); | |
e9ce1cd3 DM |
159 | m->tcf_qstats.overlimits++; |
160 | m->tcf_bstats.bytes += skb->len; | |
161 | m->tcf_bstats.packets++; | |
162 | spin_unlock(&m->tcf_lock); | |
1da177e4 LT |
163 | /* should we be asking for packet to be dropped? |
164 | * may make sense for redirect case only | |
165 | */ | |
166 | return TC_ACT_SHOT; | |
167 | } | |
168 | ||
169 | skb2 = skb_clone(skb, GFP_ATOMIC); | |
170 | if (skb2 == NULL) | |
171 | goto bad_mirred; | |
e9ce1cd3 DM |
172 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR && |
173 | m->tcfm_eaction != TCA_EGRESS_REDIR) { | |
1da177e4 | 174 | if (net_ratelimit()) |
e9ce1cd3 DM |
175 | printk("tcf_mirred unknown action %d\n", |
176 | m->tcfm_eaction); | |
1da177e4 LT |
177 | goto bad_mirred; |
178 | } | |
179 | ||
e9ce1cd3 DM |
180 | m->tcf_bstats.bytes += skb2->len; |
181 | m->tcf_bstats.packets++; | |
1da177e4 | 182 | if (!(at & AT_EGRESS)) |
e9ce1cd3 | 183 | if (m->tcfm_ok_push) |
1da177e4 LT |
184 | skb_push(skb2, skb2->dev->hard_header_len); |
185 | ||
186 | /* mirror is always swallowed */ | |
e9ce1cd3 | 187 | if (m->tcfm_eaction != TCA_EGRESS_MIRROR) |
1da177e4 LT |
188 | skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at); |
189 | ||
190 | skb2->dev = dev; | |
c01003c2 | 191 | skb2->iif = skb->dev->ifindex; |
1da177e4 | 192 | dev_queue_xmit(skb2); |
e9ce1cd3 DM |
193 | spin_unlock(&m->tcf_lock); |
194 | return m->tcf_action; | |
1da177e4 LT |
195 | } |
196 | ||
e9ce1cd3 | 197 | static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref) |
1da177e4 | 198 | { |
27a884dc | 199 | unsigned char *b = skb_tail_pointer(skb); |
e9ce1cd3 | 200 | struct tcf_mirred *m = a->priv; |
1da177e4 | 201 | struct tc_mirred opt; |
1da177e4 LT |
202 | struct tcf_t t; |
203 | ||
e9ce1cd3 DM |
204 | opt.index = m->tcf_index; |
205 | opt.action = m->tcf_action; | |
206 | opt.refcnt = m->tcf_refcnt - ref; | |
207 | opt.bindcnt = m->tcf_bindcnt - bind; | |
208 | opt.eaction = m->tcfm_eaction; | |
209 | opt.ifindex = m->tcfm_ifindex; | |
1da177e4 | 210 | RTA_PUT(skb, TCA_MIRRED_PARMS, sizeof(opt), &opt); |
e9ce1cd3 DM |
211 | t.install = jiffies_to_clock_t(jiffies - m->tcf_tm.install); |
212 | t.lastuse = jiffies_to_clock_t(jiffies - m->tcf_tm.lastuse); | |
213 | t.expires = jiffies_to_clock_t(m->tcf_tm.expires); | |
1da177e4 LT |
214 | RTA_PUT(skb, TCA_MIRRED_TM, sizeof(t), &t); |
215 | return skb->len; | |
216 | ||
e9ce1cd3 | 217 | rtattr_failure: |
dc5fc579 | 218 | nlmsg_trim(skb, b); |
1da177e4 LT |
219 | return -1; |
220 | } | |
221 | ||
222 | static struct tc_action_ops act_mirred_ops = { | |
223 | .kind = "mirred", | |
e9ce1cd3 | 224 | .hinfo = &mirred_hash_info, |
1da177e4 LT |
225 | .type = TCA_ACT_MIRRED, |
226 | .capab = TCA_CAP_NONE, | |
227 | .owner = THIS_MODULE, | |
228 | .act = tcf_mirred, | |
229 | .dump = tcf_mirred_dump, | |
230 | .cleanup = tcf_mirred_cleanup, | |
231 | .lookup = tcf_hash_search, | |
232 | .init = tcf_mirred_init, | |
233 | .walk = tcf_generic_walker | |
234 | }; | |
235 | ||
236 | MODULE_AUTHOR("Jamal Hadi Salim(2002)"); | |
237 | MODULE_DESCRIPTION("Device Mirror/redirect actions"); | |
238 | MODULE_LICENSE("GPL"); | |
239 | ||
e9ce1cd3 | 240 | static int __init mirred_init_module(void) |
1da177e4 LT |
241 | { |
242 | printk("Mirror/redirect action on\n"); | |
243 | return tcf_register_action(&act_mirred_ops); | |
244 | } | |
245 | ||
e9ce1cd3 | 246 | static void __exit mirred_cleanup_module(void) |
1da177e4 LT |
247 | { |
248 | tcf_unregister_action(&act_mirred_ops); | |
249 | } | |
250 | ||
251 | module_init(mirred_init_module); | |
252 | module_exit(mirred_cleanup_module); |