1 // SPDX-License-Identifier: GPL-2.0-only <<
2 /* 1 /*
3 * net/sched/em_ipset.c ipset ematch 2 * net/sched/em_ipset.c ipset ematch
4 * 3 *
5 * Copyright (c) 2012 Florian Westphal <fw@str 4 * Copyright (c) 2012 Florian Westphal <fw@strlen.de>
>> 5 *
>> 6 * This program is free software; you can redistribute it and/or
>> 7 * modify it under the terms of the GNU General Public License
>> 8 * version 2 as published by the Free Software Foundation.
6 */ 9 */
7 10
8 #include <linux/gfp.h> 11 #include <linux/gfp.h>
9 #include <linux/module.h> 12 #include <linux/module.h>
10 #include <linux/types.h> 13 #include <linux/types.h>
11 #include <linux/kernel.h> 14 #include <linux/kernel.h>
12 #include <linux/string.h> 15 #include <linux/string.h>
13 #include <linux/skbuff.h> 16 #include <linux/skbuff.h>
14 #include <linux/netfilter/xt_set.h> 17 #include <linux/netfilter/xt_set.h>
15 #include <linux/ipv6.h> 18 #include <linux/ipv6.h>
16 #include <net/ip.h> 19 #include <net/ip.h>
17 #include <net/pkt_cls.h> 20 #include <net/pkt_cls.h>
18 21
19 static int em_ipset_change(struct net *net, vo 22 static int em_ipset_change(struct net *net, void *data, int data_len,
20 struct tcf_ematch * 23 struct tcf_ematch *em)
21 { 24 {
22 struct xt_set_info *set = data; 25 struct xt_set_info *set = data;
23 ip_set_id_t index; 26 ip_set_id_t index;
24 27
25 if (data_len != sizeof(*set)) 28 if (data_len != sizeof(*set))
26 return -EINVAL; 29 return -EINVAL;
27 30
28 index = ip_set_nfnl_get_byindex(net, s 31 index = ip_set_nfnl_get_byindex(net, set->index);
29 if (index == IPSET_INVALID_ID) 32 if (index == IPSET_INVALID_ID)
30 return -ENOENT; 33 return -ENOENT;
31 34
32 em->datalen = sizeof(*set); 35 em->datalen = sizeof(*set);
33 em->data = (unsigned long)kmemdup(data 36 em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
34 if (em->data) 37 if (em->data)
35 return 0; 38 return 0;
36 39
37 ip_set_nfnl_put(net, index); 40 ip_set_nfnl_put(net, index);
38 return -ENOMEM; 41 return -ENOMEM;
39 } 42 }
40 43
41 static void em_ipset_destroy(struct tcf_ematch 44 static void em_ipset_destroy(struct tcf_ematch *em)
42 { 45 {
43 const struct xt_set_info *set = (const 46 const struct xt_set_info *set = (const void *) em->data;
44 if (set) { 47 if (set) {
45 ip_set_nfnl_put(em->net, set-> 48 ip_set_nfnl_put(em->net, set->index);
46 kfree((void *) em->data); 49 kfree((void *) em->data);
47 } 50 }
48 } 51 }
49 52
50 static int em_ipset_match(struct sk_buff *skb, 53 static int em_ipset_match(struct sk_buff *skb, struct tcf_ematch *em,
51 struct tcf_pkt_info 54 struct tcf_pkt_info *info)
52 { 55 {
53 struct ip_set_adt_opt opt; 56 struct ip_set_adt_opt opt;
54 struct xt_action_param acpar; 57 struct xt_action_param acpar;
55 const struct xt_set_info *set = (const 58 const struct xt_set_info *set = (const void *) em->data;
56 struct net_device *dev, *indev = NULL; 59 struct net_device *dev, *indev = NULL;
57 struct nf_hook_state state = { 60 struct nf_hook_state state = {
58 .net = em->net, 61 .net = em->net,
59 }; 62 };
60 int ret, network_offset; 63 int ret, network_offset;
61 64
62 switch (skb_protocol(skb, true)) { !! 65 switch (tc_skb_protocol(skb)) {
63 case htons(ETH_P_IP): 66 case htons(ETH_P_IP):
64 state.pf = NFPROTO_IPV4; 67 state.pf = NFPROTO_IPV4;
65 if (!pskb_network_may_pull(skb 68 if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
66 return 0; 69 return 0;
67 acpar.thoff = ip_hdrlen(skb); 70 acpar.thoff = ip_hdrlen(skb);
68 break; 71 break;
69 case htons(ETH_P_IPV6): 72 case htons(ETH_P_IPV6):
70 state.pf = NFPROTO_IPV6; 73 state.pf = NFPROTO_IPV6;
71 if (!pskb_network_may_pull(skb 74 if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
72 return 0; 75 return 0;
73 /* doesn't call ipv6_find_hdr( 76 /* doesn't call ipv6_find_hdr() because ipset doesn't use thoff, yet */
74 acpar.thoff = sizeof(struct ip 77 acpar.thoff = sizeof(struct ipv6hdr);
75 break; 78 break;
76 default: 79 default:
77 return 0; 80 return 0;
78 } 81 }
79 82
80 opt.family = state.pf; 83 opt.family = state.pf;
81 opt.dim = set->dim; 84 opt.dim = set->dim;
82 opt.flags = set->flags; 85 opt.flags = set->flags;
83 opt.cmdflags = 0; 86 opt.cmdflags = 0;
84 opt.ext.timeout = ~0u; 87 opt.ext.timeout = ~0u;
85 88
86 network_offset = skb_network_offset(sk 89 network_offset = skb_network_offset(skb);
87 skb_pull(skb, network_offset); 90 skb_pull(skb, network_offset);
88 91
89 dev = skb->dev; 92 dev = skb->dev;
90 93
91 rcu_read_lock(); 94 rcu_read_lock();
92 95
93 if (skb->skb_iif) 96 if (skb->skb_iif)
94 indev = dev_get_by_index_rcu(e 97 indev = dev_get_by_index_rcu(em->net, skb->skb_iif);
95 98
96 state.in = indev ? indev : dev; 99 state.in = indev ? indev : dev;
97 state.out = dev; 100 state.out = dev;
98 acpar.state = &state; 101 acpar.state = &state;
99 102
100 ret = ip_set_test(set->index, skb, &ac 103 ret = ip_set_test(set->index, skb, &acpar, &opt);
101 104
102 rcu_read_unlock(); 105 rcu_read_unlock();
103 106
104 skb_push(skb, network_offset); 107 skb_push(skb, network_offset);
105 return ret; 108 return ret;
106 } 109 }
107 110
108 static struct tcf_ematch_ops em_ipset_ops = { 111 static struct tcf_ematch_ops em_ipset_ops = {
109 .kind = TCF_EM_IPSET, 112 .kind = TCF_EM_IPSET,
110 .change = em_ipset_change, 113 .change = em_ipset_change,
111 .destroy = em_ipset_destroy, 114 .destroy = em_ipset_destroy,
112 .match = em_ipset_match, 115 .match = em_ipset_match,
113 .owner = THIS_MODULE, 116 .owner = THIS_MODULE,
114 .link = LIST_HEAD_INIT(em_ipset_op 117 .link = LIST_HEAD_INIT(em_ipset_ops.link)
115 }; 118 };
116 119
117 static int __init init_em_ipset(void) 120 static int __init init_em_ipset(void)
118 { 121 {
119 return tcf_em_register(&em_ipset_ops); 122 return tcf_em_register(&em_ipset_ops);
120 } 123 }
121 124
122 static void __exit exit_em_ipset(void) 125 static void __exit exit_em_ipset(void)
123 { 126 {
124 tcf_em_unregister(&em_ipset_ops); 127 tcf_em_unregister(&em_ipset_ops);
125 } 128 }
126 129
127 MODULE_LICENSE("GPL"); 130 MODULE_LICENSE("GPL");
128 MODULE_AUTHOR("Florian Westphal <fw@strlen.de> 131 MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
129 MODULE_DESCRIPTION("TC extended match for IP s 132 MODULE_DESCRIPTION("TC extended match for IP sets");
130 133
131 module_init(init_em_ipset); 134 module_init(init_em_ipset);
132 module_exit(exit_em_ipset); 135 module_exit(exit_em_ipset);
133 136
134 MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET); 137 MODULE_ALIAS_TCF_EMATCH(TCF_EM_IPSET);
135 138
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