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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 unsigned int connmark_net_id;
 34 static struct tc_action_ops act_connmark_ops;
 35 
 36 static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
 37                         struct tcf_result *res)
 38 {
 39         const struct nf_conntrack_tuple_hash *thash;
 40         struct nf_conntrack_tuple tuple;
 41         enum ip_conntrack_info ctinfo;
 42         struct tcf_connmark_info *ca = to_connmark(a);
 43         struct nf_conntrack_zone zone;
 44         struct nf_conn *c;
 45         int proto;
 46 
 47         spin_lock(&ca->tcf_lock);
 48         tcf_lastuse_update(&ca->tcf_tm);
 49         bstats_update(&ca->tcf_bstats, skb);
 50 
 51         if (skb->protocol == htons(ETH_P_IP)) {
 52                 if (skb->len < sizeof(struct iphdr))
 53                         goto out;
 54 
 55                 proto = NFPROTO_IPV4;
 56         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 57                 if (skb->len < sizeof(struct ipv6hdr))
 58                         goto out;
 59 
 60                 proto = NFPROTO_IPV6;
 61         } else {
 62                 goto out;
 63         }
 64 
 65         c = nf_ct_get(skb, &ctinfo);
 66         if (c) {
 67                 skb->mark = c->mark;
 68                 /* using overlimits stats to count how many packets marked */
 69                 ca->tcf_qstats.overlimits++;
 70                 goto out;
 71         }
 72 
 73         if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
 74                                proto, ca->net, &tuple))
 75                 goto out;
 76 
 77         zone.id = ca->zone;
 78         zone.dir = NF_CT_DEFAULT_ZONE_DIR;
 79 
 80         thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
 81         if (!thash)
 82                 goto out;
 83 
 84         c = nf_ct_tuplehash_to_ctrack(thash);
 85         /* using overlimits stats to count how many packets marked */
 86         ca->tcf_qstats.overlimits++;
 87         skb->mark = c->mark;
 88         nf_ct_put(c);
 89 
 90 out:
 91         spin_unlock(&ca->tcf_lock);
 92         return ca->tcf_action;
 93 }
 94 
 95 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
 96         [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
 97 };
 98 
 99 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
100                              struct nlattr *est, struct tc_action **a,
101                              int ovr, int bind)
102 {
103         struct tc_action_net *tn = net_generic(net, connmark_net_id);
104         struct nlattr *tb[TCA_CONNMARK_MAX + 1];
105         struct tcf_connmark_info *ci;
106         struct tc_connmark *parm;
107         int ret = 0;
108 
109         if (!nla)
110                 return -EINVAL;
111 
112         ret = nla_parse_nested(tb, TCA_CONNMARK_MAX, nla, connmark_policy,
113                                NULL);
114         if (ret < 0)
115                 return ret;
116 
117         if (!tb[TCA_CONNMARK_PARMS])
118                 return -EINVAL;
119 
120         parm = nla_data(tb[TCA_CONNMARK_PARMS]);
121 
122         if (!tcf_hash_check(tn, parm->index, a, bind)) {
123                 ret = tcf_hash_create(tn, parm->index, est, a,
124                                       &act_connmark_ops, bind, false);
125                 if (ret)
126                         return ret;
127 
128                 ci = to_connmark(*a);
129                 ci->tcf_action = parm->action;
130                 ci->net = net;
131                 ci->zone = parm->zone;
132 
133                 tcf_hash_insert(tn, *a);
134                 ret = ACT_P_CREATED;
135         } else {
136                 ci = to_connmark(*a);
137                 if (bind)
138                         return 0;
139                 tcf_hash_release(*a, bind);
140                 if (!ovr)
141                         return -EEXIST;
142                 /* replacing action and zone */
143                 ci->tcf_action = parm->action;
144                 ci->zone = parm->zone;
145         }
146 
147         return ret;
148 }
149 
150 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
151                                     int bind, int ref)
152 {
153         unsigned char *b = skb_tail_pointer(skb);
154         struct tcf_connmark_info *ci = to_connmark(a);
155 
156         struct tc_connmark opt = {
157                 .index   = ci->tcf_index,
158                 .refcnt  = ci->tcf_refcnt - ref,
159                 .bindcnt = ci->tcf_bindcnt - bind,
160                 .action  = ci->tcf_action,
161                 .zone   = ci->zone,
162         };
163         struct tcf_t t;
164 
165         if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
166                 goto nla_put_failure;
167 
168         tcf_tm_dump(&t, &ci->tcf_tm);
169         if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
170                           TCA_CONNMARK_PAD))
171                 goto nla_put_failure;
172 
173         return skb->len;
174 nla_put_failure:
175         nlmsg_trim(skb, b);
176         return -1;
177 }
178 
179 static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
180                                struct netlink_callback *cb, int type,
181                                const struct tc_action_ops *ops)
182 {
183         struct tc_action_net *tn = net_generic(net, connmark_net_id);
184 
185         return tcf_generic_walker(tn, skb, cb, type, ops);
186 }
187 
188 static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index)
189 {
190         struct tc_action_net *tn = net_generic(net, connmark_net_id);
191 
192         return tcf_hash_search(tn, a, index);
193 }
194 
195 static struct tc_action_ops act_connmark_ops = {
196         .kind           =       "connmark",
197         .type           =       TCA_ACT_CONNMARK,
198         .owner          =       THIS_MODULE,
199         .act            =       tcf_connmark,
200         .dump           =       tcf_connmark_dump,
201         .init           =       tcf_connmark_init,
202         .walk           =       tcf_connmark_walker,
203         .lookup         =       tcf_connmark_search,
204         .size           =       sizeof(struct tcf_connmark_info),
205 };
206 
207 static __net_init int connmark_init_net(struct net *net)
208 {
209         struct tc_action_net *tn = net_generic(net, connmark_net_id);
210 
211         return tc_action_net_init(tn, &act_connmark_ops, CONNMARK_TAB_MASK);
212 }
213 
214 static void __net_exit connmark_exit_net(struct net *net)
215 {
216         struct tc_action_net *tn = net_generic(net, connmark_net_id);
217 
218         tc_action_net_exit(tn);
219 }
220 
221 static struct pernet_operations connmark_net_ops = {
222         .init = connmark_init_net,
223         .exit = connmark_exit_net,
224         .id   = &connmark_net_id,
225         .size = sizeof(struct tc_action_net),
226 };
227 
228 static int __init connmark_init_module(void)
229 {
230         return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
231 }
232 
233 static void __exit connmark_cleanup_module(void)
234 {
235         tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
236 }
237 
238 module_init(connmark_init_module);
239 module_exit(connmark_cleanup_module);
240 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
241 MODULE_DESCRIPTION("Connection tracking mark restoring");
242 MODULE_LICENSE("GPL");
243 
244 

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