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Linux/net/netfilter/xt_ipvs.c

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  1 /*
  2  *      xt_ipvs - kernel module to match IPVS connection properties
  3  *
  4  *      Author: Hannes Eder <heder@google.com>
  5  */
  6 
  7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8 
  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>
 21 
 22 #include <net/ip_vs.h>
 23 
 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");
 29 
 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)
 35 {
 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;
 45 }
 46 
 47 static bool
 48 ipvs_mt(const struct sk_buff *skb, struct xt_action_param *par)
 49 {
 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;
 57 
 58         if (data->bitmask == XT_IPVS_IPVS_PROPERTY) {
 59                 match = skb->ipvs_property ^
 60                         !!(data->invert & XT_IPVS_IPVS_PROPERTY);
 61                 goto out;
 62         }
 63 
 64         /* other flags than XT_IPVS_IPVS_PROPERTY are set */
 65         if (!skb->ipvs_property) {
 66                 match = false;
 67                 goto out;
 68         }
 69 
 70         ip_vs_fill_iph_skb(family, skb, &iph);
 71 
 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;
 77                 }
 78 
 79         pp = ip_vs_proto_get(iph.protocol);
 80         if (unlikely(!pp)) {
 81                 match = false;
 82                 goto out;
 83         }
 84 
 85         /*
 86          * Check if the packet belongs to an existing entry
 87          */
 88         cp = pp->conn_out_get(family, skb, &iph, 1 /* inverse */);
 89         if (unlikely(cp == NULL)) {
 90                 match = false;
 91                 goto out;
 92         }
 93 
 94         /*
 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.
 97          */
 98 
 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;
104                 }
105 
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;
112                 }
113 
114         if (data->bitmask & XT_IPVS_DIR) {
115                 enum ip_conntrack_info ctinfo;
116                 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
117 
118                 if (ct == NULL || nf_ct_is_untracked(ct)) {
119                         match = false;
120                         goto out_put_cp;
121                 }
122 
123                 if ((ctinfo >= IP_CT_IS_REPLY) ^
124                     !!(data->invert & XT_IPVS_DIR)) {
125                         match = false;
126                         goto out_put_cp;
127                 }
128         }
129 
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;
135                 }
136 
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;
143                 }
144         }
145 
146 out_put_cp:
147         __ip_vs_conn_put(cp);
148 out:
149         pr_debug("match=%d\n", match);
150         return match;
151 }
152 
153 static int ipvs_mt_check(const struct xt_mtchk_param *par)
154 {
155         if (par->family != NFPROTO_IPV4
156 #ifdef CONFIG_IP_VS_IPV6
157             && par->family != NFPROTO_IPV6
158 #endif
159                 ) {
160                 pr_info("protocol family %u not supported\n", par->family);
161                 return -EINVAL;
162         }
163 
164         return 0;
165 }
166 
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,
175 };
176 
177 static int __init ipvs_mt_init(void)
178 {
179         return xt_register_match(&xt_ipvs_mt_reg);
180 }
181 
182 static void __exit ipvs_mt_exit(void)
183 {
184         xt_unregister_match(&xt_ipvs_mt_reg);
185 }
186 
187 module_init(ipvs_mt_init);
188 module_exit(ipvs_mt_exit);
189 

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