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Linux/net/sched/act_connmark.c

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  1 /*
  2  * net/sched/act_connmark.c  netfilter connmark retriever action
  3  * skb mark is over-written
  4  *
  5  * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
  6  *
  7  * This program is free software; you can redistribute it and/or modify
  8  * it under the terms of the GNU General Public License as published by
  9  * the Free Software Foundation; either version 2 of the License, or
 10  * (at your option) any later version.
 11 */
 12 
 13 #include <linux/module.h>
 14 #include <linux/init.h>
 15 #include <linux/kernel.h>
 16 #include <linux/skbuff.h>
 17 #include <linux/rtnetlink.h>
 18 #include <linux/pkt_cls.h>
 19 #include <linux/ip.h>
 20 #include <linux/ipv6.h>
 21 #include <net/netlink.h>
 22 #include <net/pkt_sched.h>
 23 #include <net/act_api.h>
 24 #include <uapi/linux/tc_act/tc_connmark.h>
 25 #include <net/tc_act/tc_connmark.h>
 26 
 27 #include <net/netfilter/nf_conntrack.h>
 28 #include <net/netfilter/nf_conntrack_core.h>
 29 #include <net/netfilter/nf_conntrack_zones.h>
 30 
 31 #define CONNMARK_TAB_MASK     3
 32 
 33 static int connmark_net_id;
 34 
 35 static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
 36                         struct tcf_result *res)
 37 {
 38         const struct nf_conntrack_tuple_hash *thash;
 39         struct nf_conntrack_tuple tuple;
 40         enum ip_conntrack_info ctinfo;
 41         struct tcf_connmark_info *ca = a->priv;
 42         struct nf_conntrack_zone zone;
 43         struct nf_conn *c;
 44         int proto;
 45 
 46         spin_lock(&ca->tcf_lock);
 47         ca->tcf_tm.lastuse = jiffies;
 48         bstats_update(&ca->tcf_bstats, skb);
 49 
 50         if (skb->protocol == htons(ETH_P_IP)) {
 51                 if (skb->len < sizeof(struct iphdr))
 52                         goto out;
 53 
 54                 proto = NFPROTO_IPV4;
 55         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 56                 if (skb->len < sizeof(struct ipv6hdr))
 57                         goto out;
 58 
 59                 proto = NFPROTO_IPV6;
 60         } else {
 61                 goto out;
 62         }
 63 
 64         c = nf_ct_get(skb, &ctinfo);
 65         if (c) {
 66                 skb->mark = c->mark;
 67                 /* using overlimits stats to count how many packets marked */
 68                 ca->tcf_qstats.overlimits++;
 69                 goto out;
 70         }
 71 
 72         if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
 73                                proto, ca->net, &tuple))
 74                 goto out;
 75 
 76         zone.id = ca->zone;
 77         zone.dir = NF_CT_DEFAULT_ZONE_DIR;
 78 
 79         thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
 80         if (!thash)
 81                 goto out;
 82 
 83         c = nf_ct_tuplehash_to_ctrack(thash);
 84         /* using overlimits stats to count how many packets marked */
 85         ca->tcf_qstats.overlimits++;
 86         skb->mark = c->mark;
 87         nf_ct_put(c);
 88 
 89 out:
 90         spin_unlock(&ca->tcf_lock);
 91         return ca->tcf_action;
 92 }
 93 
 94 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
 95         [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
 96 };
 97 
 98 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
 99                              struct nlattr *est, struct tc_action *a,
100                              int ovr, int bind)
101 {
102         struct tc_action_net *tn = net_generic(net, connmark_net_id);
103         struct nlattr *tb[TCA_CONNMARK_MAX + 1];
104         struct tcf_connmark_info *ci;
105         struct tc_connmark *parm;
106         int ret = 0;
107 
108         if (!nla)
109                 return -EINVAL;
110 
111         ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy);
112         if (ret < 0)
113                 return ret;
114 
115         parm = nla_data(tb[TCA_CONNMARK_PARMS]);
116 
117         if (!tcf_hash_check(tn, parm->index, a, bind)) {
118                 ret = tcf_hash_create(tn, parm->index, est, a,
119                                       sizeof(*ci), bind, false);
120                 if (ret)
121                         return ret;
122 
123                 ci = to_connmark(a);
124                 ci->tcf_action = parm->action;
125                 ci->net = net;
126                 ci->zone = parm->zone;
127 
128                 tcf_hash_insert(tn, a);
129                 ret = ACT_P_CREATED;
130         } else {
131                 ci = to_connmark(a);
132                 if (bind)
133                         return 0;
134                 tcf_hash_release(a, bind);
135                 if (!ovr)
136                         return -EEXIST;
137                 /* replacing action and zone */
138                 ci->tcf_action = parm->action;
139                 ci->zone = parm->zone;
140         }
141 
142         return ret;
143 }
144 
145 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
146                                     int bind, int ref)
147 {
148         unsigned char *b = skb_tail_pointer(skb);
149         struct tcf_connmark_info *ci = a->priv;
150 
151         struct tc_connmark opt = {
152                 .index   = ci->tcf_index,
153                 .refcnt  = ci->tcf_refcnt - ref,
154                 .bindcnt = ci->tcf_bindcnt - bind,
155                 .action  = ci->tcf_action,
156                 .zone   = ci->zone,
157         };
158         struct tcf_t t;
159 
160         if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
161                 goto nla_put_failure;
162 
163         t.install = jiffies_to_clock_t(jiffies - ci->tcf_tm.install);
164         t.lastuse = jiffies_to_clock_t(jiffies - ci->tcf_tm.lastuse);
165         t.expires = jiffies_to_clock_t(ci->tcf_tm.expires);
166         if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
167                           TCA_CONNMARK_PAD))
168                 goto nla_put_failure;
169 
170         return skb->len;
171 nla_put_failure:
172         nlmsg_trim(skb, b);
173         return -1;
174 }
175 
176 static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
177                                struct netlink_callback *cb, int type,
178                                struct tc_action *a)
179 {
180         struct tc_action_net *tn = net_generic(net, connmark_net_id);
181 
182         return tcf_generic_walker(tn, skb, cb, type, a);
183 }
184 
185 static int tcf_connmark_search(struct net *net, struct tc_action *a, u32 index)
186 {
187         struct tc_action_net *tn = net_generic(net, connmark_net_id);
188 
189         return tcf_hash_search(tn, a, index);
190 }
191 
192 static struct tc_action_ops act_connmark_ops = {
193         .kind           =       "connmark",
194         .type           =       TCA_ACT_CONNMARK,
195         .owner          =       THIS_MODULE,
196         .act            =       tcf_connmark,
197         .dump           =       tcf_connmark_dump,
198         .init           =       tcf_connmark_init,
199         .walk           =       tcf_connmark_walker,
200         .lookup         =       tcf_connmark_search,
201 };
202 
203 static __net_init int connmark_init_net(struct net *net)
204 {
205         struct tc_action_net *tn = net_generic(net, connmark_net_id);
206 
207         return tc_action_net_init(tn, &act_connmark_ops, CONNMARK_TAB_MASK);
208 }
209 
210 static void __net_exit connmark_exit_net(struct net *net)
211 {
212         struct tc_action_net *tn = net_generic(net, connmark_net_id);
213 
214         tc_action_net_exit(tn);
215 }
216 
217 static struct pernet_operations connmark_net_ops = {
218         .init = connmark_init_net,
219         .exit = connmark_exit_net,
220         .id   = &connmark_net_id,
221         .size = sizeof(struct tc_action_net),
222 };
223 
224 static int __init connmark_init_module(void)
225 {
226         return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
227 }
228 
229 static void __exit connmark_cleanup_module(void)
230 {
231         tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
232 }
233 
234 module_init(connmark_init_module);
235 module_exit(connmark_cleanup_module);
236 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
237 MODULE_DESCRIPTION("Connection tracking mark restoring");
238 MODULE_LICENSE("GPL");
239 
240 

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