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Linux/net/bridge/netfilter/ebt_ip.c

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  1 /*
  2  *  ebt_ip
  3  *
  4  *      Authors:
  5  *      Bart De Schuymer <bdschuym@pandora.be>
  6  *
  7  *  April, 2002
  8  *
  9  *  Changes:
 10  *    added ip-sport and ip-dport
 11  *    Innominate Security Technologies AG <mhopf@innominate.com>
 12  *    September, 2002
 13  */
 14 #include <linux/ip.h>
 15 #include <net/ip.h>
 16 #include <linux/in.h>
 17 #include <linux/module.h>
 18 #include <linux/netfilter/x_tables.h>
 19 #include <linux/netfilter_bridge/ebtables.h>
 20 #include <linux/netfilter_bridge/ebt_ip.h>
 21 
 22 union pkthdr {
 23         struct {
 24                 __be16 src;
 25                 __be16 dst;
 26         } tcpudphdr;
 27         struct {
 28                 u8 type;
 29                 u8 code;
 30         } icmphdr;
 31         struct {
 32                 u8 type;
 33         } igmphdr;
 34 };
 35 
 36 static bool
 37 ebt_ip_mt(const struct sk_buff *skb, struct xt_action_param *par)
 38 {
 39         const struct ebt_ip_info *info = par->matchinfo;
 40         const struct iphdr *ih;
 41         struct iphdr _iph;
 42         const union pkthdr *pptr;
 43         union pkthdr _pkthdr;
 44 
 45         ih = skb_header_pointer(skb, 0, sizeof(_iph), &_iph);
 46         if (ih == NULL)
 47                 return false;
 48         if ((info->bitmask & EBT_IP_TOS) &&
 49             NF_INVF(info, EBT_IP_TOS, info->tos != ih->tos))
 50                 return false;
 51         if ((info->bitmask & EBT_IP_SOURCE) &&
 52             NF_INVF(info, EBT_IP_SOURCE,
 53                     (ih->saddr & info->smsk) != info->saddr))
 54                 return false;
 55         if ((info->bitmask & EBT_IP_DEST) &&
 56             NF_INVF(info, EBT_IP_DEST,
 57                     (ih->daddr & info->dmsk) != info->daddr))
 58                 return false;
 59         if (info->bitmask & EBT_IP_PROTO) {
 60                 if (NF_INVF(info, EBT_IP_PROTO, info->protocol != ih->protocol))
 61                         return false;
 62                 if (!(info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT |
 63                                        EBT_IP_ICMP | EBT_IP_IGMP)))
 64                         return true;
 65                 if (ntohs(ih->frag_off) & IP_OFFSET)
 66                         return false;
 67 
 68                 /* min icmp/igmp headersize is 4, so sizeof(_pkthdr) is ok. */
 69                 pptr = skb_header_pointer(skb, ih->ihl*4,
 70                                           sizeof(_pkthdr), &_pkthdr);
 71                 if (pptr == NULL)
 72                         return false;
 73                 if (info->bitmask & EBT_IP_DPORT) {
 74                         u32 dst = ntohs(pptr->tcpudphdr.dst);
 75                         if (NF_INVF(info, EBT_IP_DPORT,
 76                                     dst < info->dport[0] ||
 77                                     dst > info->dport[1]))
 78                                 return false;
 79                 }
 80                 if (info->bitmask & EBT_IP_SPORT) {
 81                         u32 src = ntohs(pptr->tcpudphdr.src);
 82                         if (NF_INVF(info, EBT_IP_SPORT,
 83                                     src < info->sport[0] ||
 84                                     src > info->sport[1]))
 85                                 return false;
 86                 }
 87                 if ((info->bitmask & EBT_IP_ICMP) &&
 88                     NF_INVF(info, EBT_IP_ICMP,
 89                             pptr->icmphdr.type < info->icmp_type[0] ||
 90                             pptr->icmphdr.type > info->icmp_type[1] ||
 91                             pptr->icmphdr.code < info->icmp_code[0] ||
 92                             pptr->icmphdr.code > info->icmp_code[1]))
 93                         return false;
 94                 if ((info->bitmask & EBT_IP_IGMP) &&
 95                     NF_INVF(info, EBT_IP_IGMP,
 96                             pptr->igmphdr.type < info->igmp_type[0] ||
 97                             pptr->igmphdr.type > info->igmp_type[1]))
 98                         return false;
 99         }
100         return true;
101 }
102 
103 static int ebt_ip_mt_check(const struct xt_mtchk_param *par)
104 {
105         const struct ebt_ip_info *info = par->matchinfo;
106         const struct ebt_entry *e = par->entryinfo;
107 
108         if (e->ethproto != htons(ETH_P_IP) ||
109            e->invflags & EBT_IPROTO)
110                 return -EINVAL;
111         if (info->bitmask & ~EBT_IP_MASK || info->invflags & ~EBT_IP_MASK)
112                 return -EINVAL;
113         if (info->bitmask & (EBT_IP_DPORT | EBT_IP_SPORT)) {
114                 if (info->invflags & EBT_IP_PROTO)
115                         return -EINVAL;
116                 if (info->protocol != IPPROTO_TCP &&
117                     info->protocol != IPPROTO_UDP &&
118                     info->protocol != IPPROTO_UDPLITE &&
119                     info->protocol != IPPROTO_SCTP &&
120                     info->protocol != IPPROTO_DCCP)
121                          return -EINVAL;
122         }
123         if (info->bitmask & EBT_IP_DPORT && info->dport[0] > info->dport[1])
124                 return -EINVAL;
125         if (info->bitmask & EBT_IP_SPORT && info->sport[0] > info->sport[1])
126                 return -EINVAL;
127         if (info->bitmask & EBT_IP_ICMP) {
128                 if ((info->invflags & EBT_IP_PROTO) ||
129                     info->protocol != IPPROTO_ICMP)
130                         return -EINVAL;
131                 if (info->icmp_type[0] > info->icmp_type[1] ||
132                     info->icmp_code[0] > info->icmp_code[1])
133                         return -EINVAL;
134         }
135         if (info->bitmask & EBT_IP_IGMP) {
136                 if ((info->invflags & EBT_IP_PROTO) ||
137                     info->protocol != IPPROTO_IGMP)
138                         return -EINVAL;
139                 if (info->igmp_type[0] > info->igmp_type[1])
140                         return -EINVAL;
141         }
142         return 0;
143 }
144 
145 static struct xt_match ebt_ip_mt_reg __read_mostly = {
146         .name           = "ip",
147         .revision       = 0,
148         .family         = NFPROTO_BRIDGE,
149         .match          = ebt_ip_mt,
150         .checkentry     = ebt_ip_mt_check,
151         .matchsize      = sizeof(struct ebt_ip_info),
152         .me             = THIS_MODULE,
153 };
154 
155 static int __init ebt_ip_init(void)
156 {
157         return xt_register_match(&ebt_ip_mt_reg);
158 }
159 
160 static void __exit ebt_ip_fini(void)
161 {
162         xt_unregister_match(&ebt_ip_mt_reg);
163 }
164 
165 module_init(ebt_ip_init);
166 module_exit(ebt_ip_fini);
167 MODULE_DESCRIPTION("Ebtables: IPv4 protocol packet match");
168 MODULE_LICENSE("GPL");
169 

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