~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/bridge/netfilter/ebt_ip6.c

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

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

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp