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Linux/net/bridge/netfilter/ebt_ip6.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  ebt_ip6
  4  *
  5  *      Authors:
  6  *      Manohar Castelino <manohar.r.castelino@intel.com>
  7  *      Kuo-Lang Tseng <kuo-lang.tseng@intel.com>
  8  *      Jan Engelhardt <jengelh@medozas.de>
  9  *
 10  * Summary:
 11  * This is just a modification of the IPv4 code written by
 12  * Bart De Schuymer <bdschuym@pandora.be>
 13  * with the changes required to support IPv6
 14  *
 15  *  Jan, 2008
 16  */
 17 #include <linux/ipv6.h>
 18 #include <net/ipv6.h>
 19 #include <linux/in.h>
 20 #include <linux/module.h>
 21 #include <net/dsfield.h>
 22 #include <linux/netfilter/x_tables.h>
 23 #include <linux/netfilter_bridge/ebtables.h>
 24 #include <linux/netfilter_bridge/ebt_ip6.h>
 25 
 26 union pkthdr {
 27         struct {
 28                 __be16 src;
 29                 __be16 dst;
 30         } tcpudphdr;
 31         struct {
 32                 u8 type;
 33                 u8 code;
 34         } icmphdr;
 35 };
 36 
 37 static bool
 38 ebt_ip6_mt(const struct sk_buff *skb, struct xt_action_param *par)
 39 {
 40         const struct ebt_ip6_info *info = par->matchinfo;
 41         const struct ipv6hdr *ih6;
 42         struct ipv6hdr _ip6h;
 43         const union pkthdr *pptr;
 44         union pkthdr _pkthdr;
 45 
 46         ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h);
 47         if (ih6 == NULL)
 48                 return false;
 49         if ((info->bitmask & EBT_IP6_TCLASS) &&
 50             NF_INVF(info, EBT_IP6_TCLASS,
 51                     info->tclass != ipv6_get_dsfield(ih6)))
 52                 return false;
 53         if (((info->bitmask & EBT_IP6_SOURCE) &&
 54              NF_INVF(info, EBT_IP6_SOURCE,
 55                      ipv6_masked_addr_cmp(&ih6->saddr, &info->smsk,
 56                                           &info->saddr))) ||
 57             ((info->bitmask & EBT_IP6_DEST) &&
 58              NF_INVF(info, EBT_IP6_DEST,
 59                      ipv6_masked_addr_cmp(&ih6->daddr, &info->dmsk,
 60                                           &info->daddr))))
 61                 return false;
 62         if (info->bitmask & EBT_IP6_PROTO) {
 63                 uint8_t nexthdr = ih6->nexthdr;
 64                 __be16 frag_off;
 65                 int offset_ph;
 66 
 67                 offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr, &frag_off);
 68                 if (offset_ph == -1)
 69                         return false;
 70                 if (NF_INVF(info, EBT_IP6_PROTO, info->protocol != nexthdr))
 71                         return false;
 72                 if (!(info->bitmask & (EBT_IP6_DPORT |
 73                                        EBT_IP6_SPORT | EBT_IP6_ICMP6)))
 74                         return true;
 75 
 76                 /* min icmpv6 headersize is 4, so sizeof(_pkthdr) is ok. */
 77                 pptr = skb_header_pointer(skb, offset_ph, sizeof(_pkthdr),
 78                                           &_pkthdr);
 79                 if (pptr == NULL)
 80                         return false;
 81                 if (info->bitmask & EBT_IP6_DPORT) {
 82                         u16 dst = ntohs(pptr->tcpudphdr.dst);
 83                         if (NF_INVF(info, EBT_IP6_DPORT,
 84                                     dst < info->dport[0] ||
 85                                     dst > info->dport[1]))
 86                                 return false;
 87                 }
 88                 if (info->bitmask & EBT_IP6_SPORT) {
 89                         u16 src = ntohs(pptr->tcpudphdr.src);
 90                         if (NF_INVF(info, EBT_IP6_SPORT,
 91                                     src < info->sport[0] ||
 92                                     src > info->sport[1]))
 93                                 return false;
 94                 }
 95                 if ((info->bitmask & EBT_IP6_ICMP6) &&
 96                     NF_INVF(info, EBT_IP6_ICMP6,
 97                             pptr->icmphdr.type < info->icmpv6_type[0] ||
 98                             pptr->icmphdr.type > info->icmpv6_type[1] ||
 99                             pptr->icmphdr.code < info->icmpv6_code[0] ||
100                             pptr->icmphdr.code > info->icmpv6_code[1]))
101                         return false;
102         }
103         return true;
104 }
105 
106 static int ebt_ip6_mt_check(const struct xt_mtchk_param *par)
107 {
108         const struct ebt_entry *e = par->entryinfo;
109         struct ebt_ip6_info *info = par->matchinfo;
110 
111         if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO)
112                 return -EINVAL;
113         if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK)
114                 return -EINVAL;
115         if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) {
116                 if (info->invflags & EBT_IP6_PROTO)
117                         return -EINVAL;
118                 if (info->protocol != IPPROTO_TCP &&
119                     info->protocol != IPPROTO_UDP &&
120                     info->protocol != IPPROTO_UDPLITE &&
121                     info->protocol != IPPROTO_SCTP &&
122                     info->protocol != IPPROTO_DCCP)
123                         return -EINVAL;
124         }
125         if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1])
126                 return -EINVAL;
127         if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1])
128                 return -EINVAL;
129         if (info->bitmask & EBT_IP6_ICMP6) {
130                 if ((info->invflags & EBT_IP6_PROTO) ||
131                      info->protocol != IPPROTO_ICMPV6)
132                         return -EINVAL;
133                 if (info->icmpv6_type[0] > info->icmpv6_type[1] ||
134                     info->icmpv6_code[0] > info->icmpv6_code[1])
135                         return -EINVAL;
136         }
137         return 0;
138 }
139 
140 static struct xt_match ebt_ip6_mt_reg __read_mostly = {
141         .name           = "ip6",
142         .revision       = 0,
143         .family         = NFPROTO_BRIDGE,
144         .match          = ebt_ip6_mt,
145         .checkentry     = ebt_ip6_mt_check,
146         .matchsize      = sizeof(struct ebt_ip6_info),
147         .me             = THIS_MODULE,
148 };
149 
150 static int __init ebt_ip6_init(void)
151 {
152         return xt_register_match(&ebt_ip6_mt_reg);
153 }
154 
155 static void __exit ebt_ip6_fini(void)
156 {
157         xt_unregister_match(&ebt_ip6_mt_reg);
158 }
159 
160 module_init(ebt_ip6_init);
161 module_exit(ebt_ip6_fini);
162 MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match");
163 MODULE_AUTHOR("Kuo-Lang Tseng <kuo-lang.tseng@intel.com>");
164 MODULE_LICENSE("GPL");
165 

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