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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 static unsigned int connmark_net_id;
 32 static struct tc_action_ops act_connmark_ops;
 33 
 34 static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
 35                         struct tcf_result *res)
 36 {
 37         const struct nf_conntrack_tuple_hash *thash;
 38         struct nf_conntrack_tuple tuple;
 39         enum ip_conntrack_info ctinfo;
 40         struct tcf_connmark_info *ca = to_connmark(a);
 41         struct nf_conntrack_zone zone;
 42         struct nf_conn *c;
 43         int proto;
 44 
 45         spin_lock(&ca->tcf_lock);
 46         tcf_lastuse_update(&ca->tcf_tm);
 47         bstats_update(&ca->tcf_bstats, skb);
 48 
 49         if (skb->protocol == htons(ETH_P_IP)) {
 50                 if (skb->len < sizeof(struct iphdr))
 51                         goto out;
 52 
 53                 proto = NFPROTO_IPV4;
 54         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 55                 if (skb->len < sizeof(struct ipv6hdr))
 56                         goto out;
 57 
 58                 proto = NFPROTO_IPV6;
 59         } else {
 60                 goto out;
 61         }
 62 
 63         c = nf_ct_get(skb, &ctinfo);
 64         if (c) {
 65                 skb->mark = c->mark;
 66                 /* using overlimits stats to count how many packets marked */
 67                 ca->tcf_qstats.overlimits++;
 68                 goto out;
 69         }
 70 
 71         if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
 72                                proto, ca->net, &tuple))
 73                 goto out;
 74 
 75         zone.id = ca->zone;
 76         zone.dir = NF_CT_DEFAULT_ZONE_DIR;
 77 
 78         thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
 79         if (!thash)
 80                 goto out;
 81 
 82         c = nf_ct_tuplehash_to_ctrack(thash);
 83         /* using overlimits stats to count how many packets marked */
 84         ca->tcf_qstats.overlimits++;
 85         skb->mark = c->mark;
 86         nf_ct_put(c);
 87 
 88 out:
 89         spin_unlock(&ca->tcf_lock);
 90         return ca->tcf_action;
 91 }
 92 
 93 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
 94         [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
 95 };
 96 
 97 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
 98                              struct nlattr *est, struct tc_action **a,
 99                              int ovr, int bind,
100                              struct netlink_ext_ack *extack)
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                                NULL);
113         if (ret < 0)
114                 return ret;
115 
116         if (!tb[TCA_CONNMARK_PARMS])
117                 return -EINVAL;
118 
119         parm = nla_data(tb[TCA_CONNMARK_PARMS]);
120 
121         if (!tcf_idr_check(tn, parm->index, a, bind)) {
122                 ret = tcf_idr_create(tn, parm->index, est, a,
123                                      &act_connmark_ops, bind, false);
124                 if (ret)
125                         return ret;
126 
127                 ci = to_connmark(*a);
128                 ci->tcf_action = parm->action;
129                 ci->net = net;
130                 ci->zone = parm->zone;
131 
132                 tcf_idr_insert(tn, *a);
133                 ret = ACT_P_CREATED;
134         } else {
135                 ci = to_connmark(*a);
136                 if (bind)
137                         return 0;
138                 tcf_idr_release(*a, bind);
139                 if (!ovr)
140                         return -EEXIST;
141                 /* replacing action and zone */
142                 ci->tcf_action = parm->action;
143                 ci->zone = parm->zone;
144         }
145 
146         return ret;
147 }
148 
149 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
150                                     int bind, int ref)
151 {
152         unsigned char *b = skb_tail_pointer(skb);
153         struct tcf_connmark_info *ci = to_connmark(a);
154 
155         struct tc_connmark opt = {
156                 .index   = ci->tcf_index,
157                 .refcnt  = ci->tcf_refcnt - ref,
158                 .bindcnt = ci->tcf_bindcnt - bind,
159                 .action  = ci->tcf_action,
160                 .zone   = ci->zone,
161         };
162         struct tcf_t t;
163 
164         if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
165                 goto nla_put_failure;
166 
167         tcf_tm_dump(&t, &ci->tcf_tm);
168         if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
169                           TCA_CONNMARK_PAD))
170                 goto nla_put_failure;
171 
172         return skb->len;
173 nla_put_failure:
174         nlmsg_trim(skb, b);
175         return -1;
176 }
177 
178 static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
179                                struct netlink_callback *cb, int type,
180                                const struct tc_action_ops *ops,
181                                struct netlink_ext_ack *extack)
182 {
183         struct tc_action_net *tn = net_generic(net, connmark_net_id);
184 
185         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
186 }
187 
188 static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index,
189                                struct netlink_ext_ack *extack)
190 {
191         struct tc_action_net *tn = net_generic(net, connmark_net_id);
192 
193         return tcf_idr_search(tn, a, index);
194 }
195 
196 static struct tc_action_ops act_connmark_ops = {
197         .kind           =       "connmark",
198         .type           =       TCA_ACT_CONNMARK,
199         .owner          =       THIS_MODULE,
200         .act            =       tcf_connmark,
201         .dump           =       tcf_connmark_dump,
202         .init           =       tcf_connmark_init,
203         .walk           =       tcf_connmark_walker,
204         .lookup         =       tcf_connmark_search,
205         .size           =       sizeof(struct tcf_connmark_info),
206 };
207 
208 static __net_init int connmark_init_net(struct net *net)
209 {
210         struct tc_action_net *tn = net_generic(net, connmark_net_id);
211 
212         return tc_action_net_init(tn, &act_connmark_ops);
213 }
214 
215 static void __net_exit connmark_exit_net(struct list_head *net_list)
216 {
217         tc_action_net_exit(net_list, connmark_net_id);
218 }
219 
220 static struct pernet_operations connmark_net_ops = {
221         .init = connmark_init_net,
222         .exit_batch = connmark_exit_net,
223         .id   = &connmark_net_id,
224         .size = sizeof(struct tc_action_net),
225 };
226 
227 static int __init connmark_init_module(void)
228 {
229         return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
230 }
231 
232 static void __exit connmark_cleanup_module(void)
233 {
234         tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
235 }
236 
237 module_init(connmark_init_module);
238 module_exit(connmark_cleanup_module);
239 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
240 MODULE_DESCRIPTION("Connection tracking mark restoring");
241 MODULE_LICENSE("GPL");
242 
243 

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