nfsd4: typo logical vs bitwise negate for want_mask
[linux-btrfs-devel.git] / net / netfilter / xt_ipvs.c
blobbb10b0717f1bd1472411ce9b0892750722400bab
1 /*
2 * xt_ipvs - kernel module to match IPVS connection properties
4 * Author: Hannes Eder <heder@google.com>
5 */
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
9 #include <linux/module.h>
10 #include <linux/moduleparam.h>
11 #include <linux/spinlock.h>
12 #include <linux/skbuff.h>
13 #ifdef CONFIG_IP_VS_IPV6
14 #include <net/ipv6.h>
15 #endif
16 #include <linux/ip_vs.h>
17 #include <linux/types.h>
18 #include <linux/netfilter/x_tables.h>
19 #include <linux/netfilter/xt_ipvs.h>
20 #include <net/netfilter/nf_conntrack.h>
22 #include <net/ip_vs.h>
24 MODULE_AUTHOR("Hannes Eder <heder@google.com>");
25 MODULE_DESCRIPTION("Xtables: match IPVS connection properties");
26 MODULE_LICENSE("GPL");
27 MODULE_ALIAS("ipt_ipvs");
28 MODULE_ALIAS("ip6t_ipvs");
30 /* borrowed from xt_conntrack */
31 static bool ipvs_mt_addrcmp(const union nf_inet_addr *kaddr,
32 const union nf_inet_addr *uaddr,
33 const union nf_inet_addr *umask,
34 unsigned int l3proto)
36 if (l3proto == NFPROTO_IPV4)
37 return ((kaddr->ip ^ uaddr->ip) & umask->ip) == 0;
38 #ifdef CONFIG_IP_VS_IPV6
39 else if (l3proto == NFPROTO_IPV6)
40 return ipv6_masked_addr_cmp(&kaddr->in6, &umask->in6,
41 &uaddr->in6) == 0;
42 #endif
43 else
44 return false;
47 static bool
48 ipvs_mt(const struct sk_buff *skb, struct xt_action_param *par)
50 const struct xt_ipvs_mtinfo *data = par->matchinfo;
51 /* ipvs_mt_check ensures that family is only NFPROTO_IPV[46]. */
52 const u_int8_t family = par->family;
53 struct ip_vs_iphdr iph;
54 struct ip_vs_protocol *pp;
55 struct ip_vs_conn *cp;
56 bool match = true;
58 if (data->bitmask == XT_IPVS_IPVS_PROPERTY) {
59 match = skb->ipvs_property ^
60 !!(data->invert & XT_IPVS_IPVS_PROPERTY);
61 goto out;
64 /* other flags than XT_IPVS_IPVS_PROPERTY are set */
65 if (!skb->ipvs_property) {
66 match = false;
67 goto out;
70 ip_vs_fill_iphdr(family, skb_network_header(skb), &iph);
72 if (data->bitmask & XT_IPVS_PROTO)
73 if ((iph.protocol == data->l4proto) ^
74 !(data->invert & XT_IPVS_PROTO)) {
75 match = false;
76 goto out;
79 pp = ip_vs_proto_get(iph.protocol);
80 if (unlikely(!pp)) {
81 match = false;
82 goto out;
86 * Check if the packet belongs to an existing entry
88 cp = pp->conn_out_get(family, skb, &iph, iph.len, 1 /* inverse */);
89 if (unlikely(cp == NULL)) {
90 match = false;
91 goto out;
95 * We found a connection, i.e. ct != 0, make sure to call
96 * __ip_vs_conn_put before returning. In our case jump to out_put_con.
99 if (data->bitmask & XT_IPVS_VPORT)
100 if ((cp->vport == data->vport) ^
101 !(data->invert & XT_IPVS_VPORT)) {
102 match = false;
103 goto out_put_cp;
106 if (data->bitmask & XT_IPVS_VPORTCTL)
107 if ((cp->control != NULL &&
108 cp->control->vport == data->vportctl) ^
109 !(data->invert & XT_IPVS_VPORTCTL)) {
110 match = false;
111 goto out_put_cp;
114 if (data->bitmask & XT_IPVS_DIR) {
115 enum ip_conntrack_info ctinfo;
116 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
118 if (ct == NULL || nf_ct_is_untracked(ct)) {
119 match = false;
120 goto out_put_cp;
123 if ((ctinfo >= IP_CT_IS_REPLY) ^
124 !!(data->invert & XT_IPVS_DIR)) {
125 match = false;
126 goto out_put_cp;
130 if (data->bitmask & XT_IPVS_METHOD)
131 if (((cp->flags & IP_VS_CONN_F_FWD_MASK) == data->fwd_method) ^
132 !(data->invert & XT_IPVS_METHOD)) {
133 match = false;
134 goto out_put_cp;
137 if (data->bitmask & XT_IPVS_VADDR) {
138 if (ipvs_mt_addrcmp(&cp->vaddr, &data->vaddr,
139 &data->vmask, family) ^
140 !(data->invert & XT_IPVS_VADDR)) {
141 match = false;
142 goto out_put_cp;
146 out_put_cp:
147 __ip_vs_conn_put(cp);
148 out:
149 pr_debug("match=%d\n", match);
150 return match;
153 static int ipvs_mt_check(const struct xt_mtchk_param *par)
155 if (par->family != NFPROTO_IPV4
156 #ifdef CONFIG_IP_VS_IPV6
157 && par->family != NFPROTO_IPV6
158 #endif
160 pr_info("protocol family %u not supported\n", par->family);
161 return -EINVAL;
164 return 0;
167 static struct xt_match xt_ipvs_mt_reg __read_mostly = {
168 .name = "ipvs",
169 .revision = 0,
170 .family = NFPROTO_UNSPEC,
171 .match = ipvs_mt,
172 .checkentry = ipvs_mt_check,
173 .matchsize = XT_ALIGN(sizeof(struct xt_ipvs_mtinfo)),
174 .me = THIS_MODULE,
177 static int __init ipvs_mt_init(void)
179 return xt_register_match(&xt_ipvs_mt_reg);
182 static void __exit ipvs_mt_exit(void)
184 xt_unregister_match(&xt_ipvs_mt_reg);
187 module_init(ipvs_mt_init);
188 module_exit(ipvs_mt_exit);