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Linux/net/sched/act_connmark.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  * net/sched/act_connmark.c  netfilter connmark retriever action
  4  * skb mark is over-written
  5  *
  6  * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
  7 */
  8 
  9 #include <linux/module.h>
 10 #include <linux/init.h>
 11 #include <linux/kernel.h>
 12 #include <linux/skbuff.h>
 13 #include <linux/rtnetlink.h>
 14 #include <linux/pkt_cls.h>
 15 #include <linux/ip.h>
 16 #include <linux/ipv6.h>
 17 #include <net/netlink.h>
 18 #include <net/pkt_sched.h>
 19 #include <net/act_api.h>
 20 #include <net/pkt_cls.h>
 21 #include <uapi/linux/tc_act/tc_connmark.h>
 22 #include <net/tc_act/tc_connmark.h>
 23 
 24 #include <net/netfilter/nf_conntrack.h>
 25 #include <net/netfilter/nf_conntrack_core.h>
 26 #include <net/netfilter/nf_conntrack_zones.h>
 27 
 28 static unsigned int connmark_net_id;
 29 static struct tc_action_ops act_connmark_ops;
 30 
 31 static int tcf_connmark_act(struct sk_buff *skb, const struct tc_action *a,
 32                             struct tcf_result *res)
 33 {
 34         const struct nf_conntrack_tuple_hash *thash;
 35         struct nf_conntrack_tuple tuple;
 36         enum ip_conntrack_info ctinfo;
 37         struct tcf_connmark_info *ca = to_connmark(a);
 38         struct nf_conntrack_zone zone;
 39         struct nf_conn *c;
 40         int proto;
 41 
 42         spin_lock(&ca->tcf_lock);
 43         tcf_lastuse_update(&ca->tcf_tm);
 44         bstats_update(&ca->tcf_bstats, skb);
 45 
 46         if (skb->protocol == htons(ETH_P_IP)) {
 47                 if (skb->len < sizeof(struct iphdr))
 48                         goto out;
 49 
 50                 proto = NFPROTO_IPV4;
 51         } else if (skb->protocol == htons(ETH_P_IPV6)) {
 52                 if (skb->len < sizeof(struct ipv6hdr))
 53                         goto out;
 54 
 55                 proto = NFPROTO_IPV6;
 56         } else {
 57                 goto out;
 58         }
 59 
 60         c = nf_ct_get(skb, &ctinfo);
 61         if (c) {
 62                 skb->mark = c->mark;
 63                 /* using overlimits stats to count how many packets marked */
 64                 ca->tcf_qstats.overlimits++;
 65                 goto out;
 66         }
 67 
 68         if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb),
 69                                proto, ca->net, &tuple))
 70                 goto out;
 71 
 72         zone.id = ca->zone;
 73         zone.dir = NF_CT_DEFAULT_ZONE_DIR;
 74 
 75         thash = nf_conntrack_find_get(ca->net, &zone, &tuple);
 76         if (!thash)
 77                 goto out;
 78 
 79         c = nf_ct_tuplehash_to_ctrack(thash);
 80         /* using overlimits stats to count how many packets marked */
 81         ca->tcf_qstats.overlimits++;
 82         skb->mark = c->mark;
 83         nf_ct_put(c);
 84 
 85 out:
 86         spin_unlock(&ca->tcf_lock);
 87         return ca->tcf_action;
 88 }
 89 
 90 static const struct nla_policy connmark_policy[TCA_CONNMARK_MAX + 1] = {
 91         [TCA_CONNMARK_PARMS] = { .len = sizeof(struct tc_connmark) },
 92 };
 93 
 94 static int tcf_connmark_init(struct net *net, struct nlattr *nla,
 95                              struct nlattr *est, struct tc_action **a,
 96                              int ovr, int bind, bool rtnl_held,
 97                              struct tcf_proto *tp,
 98                              struct netlink_ext_ack *extack)
 99 {
100         struct tc_action_net *tn = net_generic(net, connmark_net_id);
101         struct nlattr *tb[TCA_CONNMARK_MAX + 1];
102         struct tcf_chain *goto_ch = NULL;
103         struct tcf_connmark_info *ci;
104         struct tc_connmark *parm;
105         int ret = 0, err;
106         u32 index;
107 
108         if (!nla)
109                 return -EINVAL;
110 
111         ret = nla_parse_nested_deprecated(tb, TCA_CONNMARK_MAX, nla,
112                                           connmark_policy, 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         index = parm->index;
121         ret = tcf_idr_check_alloc(tn, &index, a, bind);
122         if (!ret) {
123                 ret = tcf_idr_create(tn, index, est, a,
124                                      &act_connmark_ops, bind, false);
125                 if (ret) {
126                         tcf_idr_cleanup(tn, index);
127                         return ret;
128                 }
129 
130                 ci = to_connmark(*a);
131                 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
132                                                extack);
133                 if (err < 0)
134                         goto release_idr;
135                 tcf_action_set_ctrlact(*a, parm->action, goto_ch);
136                 ci->net = net;
137                 ci->zone = parm->zone;
138 
139                 tcf_idr_insert(tn, *a);
140                 ret = ACT_P_CREATED;
141         } else if (ret > 0) {
142                 ci = to_connmark(*a);
143                 if (bind)
144                         return 0;
145                 if (!ovr) {
146                         tcf_idr_release(*a, bind);
147                         return -EEXIST;
148                 }
149                 err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch,
150                                                extack);
151                 if (err < 0)
152                         goto release_idr;
153                 /* replacing action and zone */
154                 spin_lock_bh(&ci->tcf_lock);
155                 goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
156                 ci->zone = parm->zone;
157                 spin_unlock_bh(&ci->tcf_lock);
158                 if (goto_ch)
159                         tcf_chain_put_by_act(goto_ch);
160                 ret = 0;
161         }
162 
163         return ret;
164 release_idr:
165         tcf_idr_release(*a, bind);
166         return err;
167 }
168 
169 static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
170                                     int bind, int ref)
171 {
172         unsigned char *b = skb_tail_pointer(skb);
173         struct tcf_connmark_info *ci = to_connmark(a);
174         struct tc_connmark opt = {
175                 .index   = ci->tcf_index,
176                 .refcnt  = refcount_read(&ci->tcf_refcnt) - ref,
177                 .bindcnt = atomic_read(&ci->tcf_bindcnt) - bind,
178         };
179         struct tcf_t t;
180 
181         spin_lock_bh(&ci->tcf_lock);
182         opt.action = ci->tcf_action;
183         opt.zone = ci->zone;
184         if (nla_put(skb, TCA_CONNMARK_PARMS, sizeof(opt), &opt))
185                 goto nla_put_failure;
186 
187         tcf_tm_dump(&t, &ci->tcf_tm);
188         if (nla_put_64bit(skb, TCA_CONNMARK_TM, sizeof(t), &t,
189                           TCA_CONNMARK_PAD))
190                 goto nla_put_failure;
191         spin_unlock_bh(&ci->tcf_lock);
192 
193         return skb->len;
194 
195 nla_put_failure:
196         spin_unlock_bh(&ci->tcf_lock);
197         nlmsg_trim(skb, b);
198         return -1;
199 }
200 
201 static int tcf_connmark_walker(struct net *net, struct sk_buff *skb,
202                                struct netlink_callback *cb, int type,
203                                const struct tc_action_ops *ops,
204                                struct netlink_ext_ack *extack)
205 {
206         struct tc_action_net *tn = net_generic(net, connmark_net_id);
207 
208         return tcf_generic_walker(tn, skb, cb, type, ops, extack);
209 }
210 
211 static int tcf_connmark_search(struct net *net, struct tc_action **a, u32 index)
212 {
213         struct tc_action_net *tn = net_generic(net, connmark_net_id);
214 
215         return tcf_idr_search(tn, a, index);
216 }
217 
218 static struct tc_action_ops act_connmark_ops = {
219         .kind           =       "connmark",
220         .id             =       TCA_ID_CONNMARK,
221         .owner          =       THIS_MODULE,
222         .act            =       tcf_connmark_act,
223         .dump           =       tcf_connmark_dump,
224         .init           =       tcf_connmark_init,
225         .walk           =       tcf_connmark_walker,
226         .lookup         =       tcf_connmark_search,
227         .size           =       sizeof(struct tcf_connmark_info),
228 };
229 
230 static __net_init int connmark_init_net(struct net *net)
231 {
232         struct tc_action_net *tn = net_generic(net, connmark_net_id);
233 
234         return tc_action_net_init(net, tn, &act_connmark_ops);
235 }
236 
237 static void __net_exit connmark_exit_net(struct list_head *net_list)
238 {
239         tc_action_net_exit(net_list, connmark_net_id);
240 }
241 
242 static struct pernet_operations connmark_net_ops = {
243         .init = connmark_init_net,
244         .exit_batch = connmark_exit_net,
245         .id   = &connmark_net_id,
246         .size = sizeof(struct tc_action_net),
247 };
248 
249 static int __init connmark_init_module(void)
250 {
251         return tcf_register_action(&act_connmark_ops, &connmark_net_ops);
252 }
253 
254 static void __exit connmark_cleanup_module(void)
255 {
256         tcf_unregister_action(&act_connmark_ops, &connmark_net_ops);
257 }
258 
259 module_init(connmark_init_module);
260 module_exit(connmark_cleanup_module);
261 MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
262 MODULE_DESCRIPTION("Connection tracking mark restoring");
263 MODULE_LICENSE("GPL");
264 

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