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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         struct netns_ipvs *ipvs = net_ipvs(par->net);
 52         /* ipvs_mt_check ensures that family is only NFPROTO_IPV[46]. */
 53         const u_int8_t family = par->family;
 54         struct ip_vs_iphdr iph;
 55         struct ip_vs_protocol *pp;
 56         struct ip_vs_conn *cp;
 57         bool match = true;
 58 
 59         if (data->bitmask == XT_IPVS_IPVS_PROPERTY) {
 60                 match = skb->ipvs_property ^
 61                         !!(data->invert & XT_IPVS_IPVS_PROPERTY);
 62                 goto out;
 63         }
 64 
 65         /* other flags than XT_IPVS_IPVS_PROPERTY are set */
 66         if (!skb->ipvs_property) {
 67                 match = false;
 68                 goto out;
 69         }
 70 
 71         ip_vs_fill_iph_skb(family, skb, true, &iph);
 72 
 73         if (data->bitmask & XT_IPVS_PROTO)
 74                 if ((iph.protocol == data->l4proto) ^
 75                     !(data->invert & XT_IPVS_PROTO)) {
 76                         match = false;
 77                         goto out;
 78                 }
 79 
 80         pp = ip_vs_proto_get(iph.protocol);
 81         if (unlikely(!pp)) {
 82                 match = false;
 83                 goto out;
 84         }
 85 
 86         /*
 87          * Check if the packet belongs to an existing entry
 88          */
 89         cp = pp->conn_out_get(ipvs, family, skb, &iph);
 90         if (unlikely(cp == NULL)) {
 91                 match = false;
 92                 goto out;
 93         }
 94 
 95         /*
 96          * We found a connection, i.e. ct != 0, make sure to call
 97          * __ip_vs_conn_put before returning.  In our case jump to out_put_con.
 98          */
 99 
100         if (data->bitmask & XT_IPVS_VPORT)
101                 if ((cp->vport == data->vport) ^
102                     !(data->invert & XT_IPVS_VPORT)) {
103                         match = false;
104                         goto out_put_cp;
105                 }
106 
107         if (data->bitmask & XT_IPVS_VPORTCTL)
108                 if ((cp->control != NULL &&
109                      cp->control->vport == data->vportctl) ^
110                     !(data->invert & XT_IPVS_VPORTCTL)) {
111                         match = false;
112                         goto out_put_cp;
113                 }
114 
115         if (data->bitmask & XT_IPVS_DIR) {
116                 enum ip_conntrack_info ctinfo;
117                 struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
118 
119                 if (ct == NULL || nf_ct_is_untracked(ct)) {
120                         match = false;
121                         goto out_put_cp;
122                 }
123 
124                 if ((ctinfo >= IP_CT_IS_REPLY) ^
125                     !!(data->invert & XT_IPVS_DIR)) {
126                         match = false;
127                         goto out_put_cp;
128                 }
129         }
130 
131         if (data->bitmask & XT_IPVS_METHOD)
132                 if (((cp->flags & IP_VS_CONN_F_FWD_MASK) == data->fwd_method) ^
133                     !(data->invert & XT_IPVS_METHOD)) {
134                         match = false;
135                         goto out_put_cp;
136                 }
137 
138         if (data->bitmask & XT_IPVS_VADDR) {
139                 if (ipvs_mt_addrcmp(&cp->vaddr, &data->vaddr,
140                                     &data->vmask, family) ^
141                     !(data->invert & XT_IPVS_VADDR)) {
142                         match = false;
143                         goto out_put_cp;
144                 }
145         }
146 
147 out_put_cp:
148         __ip_vs_conn_put(cp);
149 out:
150         pr_debug("match=%d\n", match);
151         return match;
152 }
153 
154 static int ipvs_mt_check(const struct xt_mtchk_param *par)
155 {
156         if (par->family != NFPROTO_IPV4
157 #ifdef CONFIG_IP_VS_IPV6
158             && par->family != NFPROTO_IPV6
159 #endif
160                 ) {
161                 pr_info("protocol family %u not supported\n", par->family);
162                 return -EINVAL;
163         }
164 
165         return 0;
166 }
167 
168 static struct xt_match xt_ipvs_mt_reg __read_mostly = {
169         .name       = "ipvs",
170         .revision   = 0,
171         .family     = NFPROTO_UNSPEC,
172         .match      = ipvs_mt,
173         .checkentry = ipvs_mt_check,
174         .matchsize  = XT_ALIGN(sizeof(struct xt_ipvs_mtinfo)),
175         .me         = THIS_MODULE,
176 };
177 
178 static int __init ipvs_mt_init(void)
179 {
180         return xt_register_match(&xt_ipvs_mt_reg);
181 }
182 
183 static void __exit ipvs_mt_exit(void)
184 {
185         xt_unregister_match(&xt_ipvs_mt_reg);
186 }
187 
188 module_init(ipvs_mt_init);
189 module_exit(ipvs_mt_exit);
190 

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