610 lines
14 KiB
C
610 lines
14 KiB
C
/* Copyright (C) 2011-2013 Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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/* Kernel module implementing an IP set type: the hash:net,iface type */
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#include <linux/jhash.h>
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <linux/skbuff.h>
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#include <linux/errno.h>
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#include <linux/random.h>
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#include <linux/rbtree.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/ipset/pfxlen.h>
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#include <linux/netfilter/ipset/ip_set.h>
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#include <linux/netfilter/ipset/ip_set_hash.h>
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#define IPSET_TYPE_REV_MIN 0
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/* 1 nomatch flag support added */
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/* 2 /0 support added */
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/* 3 Counters support added */
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#define IPSET_TYPE_REV_MAX 4 /* Comments support added */
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>");
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IP_SET_MODULE_DESC("hash:net,iface", IPSET_TYPE_REV_MIN, IPSET_TYPE_REV_MAX);
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MODULE_ALIAS("ip_set_hash:net,iface");
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/* Interface name rbtree */
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struct iface_node {
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struct rb_node node;
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char iface[IFNAMSIZ];
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};
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#define iface_data(n) (rb_entry(n, struct iface_node, node)->iface)
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static void
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rbtree_destroy(struct rb_root *root)
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{
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struct iface_node *node, *next;
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rbtree_postorder_for_each_entry_safe(node, next, root, node)
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kfree(node);
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*root = RB_ROOT;
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}
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static int
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iface_test(struct rb_root *root, const char **iface)
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{
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struct rb_node *n = root->rb_node;
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while (n) {
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const char *d = iface_data(n);
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int res = strcmp(*iface, d);
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if (res < 0)
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n = n->rb_left;
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else if (res > 0)
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n = n->rb_right;
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else {
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*iface = d;
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return 1;
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}
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}
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return 0;
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}
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static int
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iface_add(struct rb_root *root, const char **iface)
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{
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struct rb_node **n = &(root->rb_node), *p = NULL;
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struct iface_node *d;
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while (*n) {
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char *ifname = iface_data(*n);
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int res = strcmp(*iface, ifname);
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p = *n;
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if (res < 0)
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n = &((*n)->rb_left);
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else if (res > 0)
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n = &((*n)->rb_right);
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else {
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*iface = ifname;
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return 0;
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}
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}
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d = kzalloc(sizeof(*d), GFP_ATOMIC);
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if (!d)
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return -ENOMEM;
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strcpy(d->iface, *iface);
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rb_link_node(&d->node, p, n);
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rb_insert_color(&d->node, root);
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*iface = d->iface;
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return 0;
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}
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/* Type specific function prefix */
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#define HTYPE hash_netiface
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#define IP_SET_HASH_WITH_NETS
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#define IP_SET_HASH_WITH_RBTREE
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#define IP_SET_HASH_WITH_MULTI
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#define STREQ(a, b) (strcmp(a, b) == 0)
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/* IPv4 variant */
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struct hash_netiface4_elem_hashed {
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__be32 ip;
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u8 physdev;
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u8 cidr;
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u8 nomatch;
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u8 elem;
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};
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/* Member elements */
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struct hash_netiface4_elem {
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__be32 ip;
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u8 physdev;
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u8 cidr;
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u8 nomatch;
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u8 elem;
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const char *iface;
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};
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/* Common functions */
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static inline bool
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hash_netiface4_data_equal(const struct hash_netiface4_elem *ip1,
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const struct hash_netiface4_elem *ip2,
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u32 *multi)
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{
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return ip1->ip == ip2->ip &&
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ip1->cidr == ip2->cidr &&
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(++*multi) &&
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ip1->physdev == ip2->physdev &&
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ip1->iface == ip2->iface;
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}
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static inline int
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hash_netiface4_do_data_match(const struct hash_netiface4_elem *elem)
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{
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return elem->nomatch ? -ENOTEMPTY : 1;
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}
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static inline void
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hash_netiface4_data_set_flags(struct hash_netiface4_elem *elem, u32 flags)
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{
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elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
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}
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static inline void
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hash_netiface4_data_reset_flags(struct hash_netiface4_elem *elem, u8 *flags)
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{
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swap(*flags, elem->nomatch);
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}
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static inline void
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hash_netiface4_data_netmask(struct hash_netiface4_elem *elem, u8 cidr)
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{
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elem->ip &= ip_set_netmask(cidr);
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elem->cidr = cidr;
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}
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static bool
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hash_netiface4_data_list(struct sk_buff *skb,
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const struct hash_netiface4_elem *data)
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{
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u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
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if (data->nomatch)
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flags |= IPSET_FLAG_NOMATCH;
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if (nla_put_ipaddr4(skb, IPSET_ATTR_IP, data->ip) ||
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nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
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nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
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(flags &&
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nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return 1;
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}
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static inline void
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hash_netiface4_data_next(struct hash_netiface4_elem *next,
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const struct hash_netiface4_elem *d)
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{
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next->ip = d->ip;
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}
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#define MTYPE hash_netiface4
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#define PF 4
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#define HOST_MASK 32
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#define HKEY_DATALEN sizeof(struct hash_netiface4_elem_hashed)
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#include "ip_set_hash_gen.h"
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static int
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hash_netiface4_kadt(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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enum ipset_adt adt, struct ip_set_adt_opt *opt)
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{
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struct hash_netiface *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_netiface4_elem e = {
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.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
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.elem = 1,
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};
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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int ret;
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if (e.cidr == 0)
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return -EINVAL;
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if (adt == IPSET_TEST)
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e.cidr = HOST_MASK;
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ip4addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip);
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e.ip &= ip_set_netmask(e.cidr);
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#define IFACE(dir) (par->dir ? par->dir->name : NULL)
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#define PHYSDEV(dir) (nf_bridge->dir ? nf_bridge->dir->name : NULL)
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#define SRCDIR (opt->flags & IPSET_DIM_TWO_SRC)
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if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
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#ifdef CONFIG_BRIDGE_NETFILTER
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const struct nf_bridge_info *nf_bridge = skb->nf_bridge;
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if (!nf_bridge)
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return -EINVAL;
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e.iface = SRCDIR ? PHYSDEV(physindev) : PHYSDEV(physoutdev);
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e.physdev = 1;
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#else
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e.iface = NULL;
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#endif
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} else
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e.iface = SRCDIR ? IFACE(in) : IFACE(out);
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if (!e.iface)
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return -EINVAL;
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ret = iface_test(&h->rbtree, &e.iface);
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if (adt == IPSET_ADD) {
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if (!ret) {
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ret = iface_add(&h->rbtree, &e.iface);
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if (ret)
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return ret;
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}
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} else if (!ret)
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return ret;
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return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
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}
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static int
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hash_netiface4_uadt(struct ip_set *set, struct nlattr *tb[],
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enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
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{
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struct hash_netiface *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_netiface4_elem e = { .cidr = HOST_MASK, .elem = 1 };
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struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
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u32 ip = 0, ip_to = 0, last;
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char iface[IFNAMSIZ];
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int ret;
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if (unlikely(!tb[IPSET_ATTR_IP] ||
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!tb[IPSET_ATTR_IFACE] ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
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!ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
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return -IPSET_ERR_PROTOCOL;
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if (tb[IPSET_ATTR_LINENO])
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*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP], &ip) ||
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ip_set_get_extensions(set, tb, &ext);
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if (ret)
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return ret;
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if (tb[IPSET_ATTR_CIDR]) {
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e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
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if (e.cidr > HOST_MASK)
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return -IPSET_ERR_INVALID_CIDR;
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}
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strcpy(iface, nla_data(tb[IPSET_ATTR_IFACE]));
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e.iface = iface;
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ret = iface_test(&h->rbtree, &e.iface);
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if (adt == IPSET_ADD) {
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if (!ret) {
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ret = iface_add(&h->rbtree, &e.iface);
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if (ret)
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return ret;
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}
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} else if (!ret)
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return ret;
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if (tb[IPSET_ATTR_CADT_FLAGS]) {
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u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
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if (cadt_flags & IPSET_FLAG_PHYSDEV)
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e.physdev = 1;
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if (cadt_flags & IPSET_FLAG_NOMATCH)
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flags |= (IPSET_FLAG_NOMATCH << 16);
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}
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if (adt == IPSET_TEST || !tb[IPSET_ATTR_IP_TO]) {
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e.ip = htonl(ip & ip_set_hostmask(e.cidr));
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ret = adtfn(set, &e, &ext, &ext, flags);
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return ip_set_enomatch(ret, flags, adt, set) ? -ret :
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ip_set_eexist(ret, flags) ? 0 : ret;
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}
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if (tb[IPSET_ATTR_IP_TO]) {
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ret = ip_set_get_hostipaddr4(tb[IPSET_ATTR_IP_TO], &ip_to);
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if (ret)
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return ret;
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if (ip_to < ip)
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swap(ip, ip_to);
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if (ip + UINT_MAX == ip_to)
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return -IPSET_ERR_HASH_RANGE;
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} else
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ip_set_mask_from_to(ip, ip_to, e.cidr);
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if (retried)
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ip = ntohl(h->next.ip);
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while (!after(ip, ip_to)) {
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e.ip = htonl(ip);
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last = ip_set_range_to_cidr(ip, ip_to, &e.cidr);
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ret = adtfn(set, &e, &ext, &ext, flags);
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if (ret && !ip_set_eexist(ret, flags))
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return ret;
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else
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ret = 0;
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ip = last + 1;
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}
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return ret;
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}
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/* IPv6 variant */
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struct hash_netiface6_elem_hashed {
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union nf_inet_addr ip;
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u8 physdev;
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u8 cidr;
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u8 nomatch;
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u8 elem;
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};
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struct hash_netiface6_elem {
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union nf_inet_addr ip;
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u8 physdev;
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u8 cidr;
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u8 nomatch;
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u8 elem;
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const char *iface;
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};
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/* Common functions */
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static inline bool
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hash_netiface6_data_equal(const struct hash_netiface6_elem *ip1,
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const struct hash_netiface6_elem *ip2,
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u32 *multi)
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{
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return ipv6_addr_equal(&ip1->ip.in6, &ip2->ip.in6) &&
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ip1->cidr == ip2->cidr &&
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(++*multi) &&
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ip1->physdev == ip2->physdev &&
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ip1->iface == ip2->iface;
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}
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static inline int
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hash_netiface6_do_data_match(const struct hash_netiface6_elem *elem)
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{
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return elem->nomatch ? -ENOTEMPTY : 1;
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}
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static inline void
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hash_netiface6_data_set_flags(struct hash_netiface6_elem *elem, u32 flags)
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{
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elem->nomatch = (flags >> 16) & IPSET_FLAG_NOMATCH;
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}
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static inline void
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hash_netiface6_data_reset_flags(struct hash_netiface6_elem *elem, u8 *flags)
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{
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swap(*flags, elem->nomatch);
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}
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static inline void
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hash_netiface6_data_netmask(struct hash_netiface6_elem *elem, u8 cidr)
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{
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ip6_netmask(&elem->ip, cidr);
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elem->cidr = cidr;
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}
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static bool
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hash_netiface6_data_list(struct sk_buff *skb,
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const struct hash_netiface6_elem *data)
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{
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u32 flags = data->physdev ? IPSET_FLAG_PHYSDEV : 0;
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if (data->nomatch)
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flags |= IPSET_FLAG_NOMATCH;
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if (nla_put_ipaddr6(skb, IPSET_ATTR_IP, &data->ip.in6) ||
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nla_put_u8(skb, IPSET_ATTR_CIDR, data->cidr) ||
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nla_put_string(skb, IPSET_ATTR_IFACE, data->iface) ||
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(flags &&
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nla_put_net32(skb, IPSET_ATTR_CADT_FLAGS, htonl(flags))))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return 1;
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}
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static inline void
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hash_netiface6_data_next(struct hash_netiface4_elem *next,
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const struct hash_netiface6_elem *d)
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{
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}
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#undef MTYPE
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#undef PF
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#undef HOST_MASK
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#undef HKEY_DATALEN
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#define MTYPE hash_netiface6
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#define PF 6
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#define HOST_MASK 128
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#define HKEY_DATALEN sizeof(struct hash_netiface6_elem_hashed)
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#define IP_SET_EMIT_CREATE
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#include "ip_set_hash_gen.h"
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static int
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hash_netiface6_kadt(struct ip_set *set, const struct sk_buff *skb,
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const struct xt_action_param *par,
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enum ipset_adt adt, struct ip_set_adt_opt *opt)
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{
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struct hash_netiface *h = set->data;
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ipset_adtfn adtfn = set->variant->adt[adt];
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struct hash_netiface6_elem e = {
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.cidr = IP_SET_INIT_CIDR(h->nets[0].cidr[0], HOST_MASK),
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.elem = 1,
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};
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struct ip_set_ext ext = IP_SET_INIT_KEXT(skb, opt, set);
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int ret;
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if (e.cidr == 0)
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return -EINVAL;
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if (adt == IPSET_TEST)
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e.cidr = HOST_MASK;
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ip6addrptr(skb, opt->flags & IPSET_DIM_ONE_SRC, &e.ip.in6);
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ip6_netmask(&e.ip, e.cidr);
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if (opt->cmdflags & IPSET_FLAG_PHYSDEV) {
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#ifdef CONFIG_BRIDGE_NETFILTER
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const struct nf_bridge_info *nf_bridge = skb->nf_bridge;
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if (!nf_bridge)
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return -EINVAL;
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e.iface = SRCDIR ? PHYSDEV(physindev) : PHYSDEV(physoutdev);
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e.physdev = 1;
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#else
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e.iface = NULL;
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#endif
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} else
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e.iface = SRCDIR ? IFACE(in) : IFACE(out);
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if (!e.iface)
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return -EINVAL;
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ret = iface_test(&h->rbtree, &e.iface);
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if (adt == IPSET_ADD) {
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if (!ret) {
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ret = iface_add(&h->rbtree, &e.iface);
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if (ret)
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return ret;
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}
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} else if (!ret)
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return ret;
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return adtfn(set, &e, &ext, &opt->ext, opt->cmdflags);
|
|
}
|
|
|
|
static int
|
|
hash_netiface6_uadt(struct ip_set *set, struct nlattr *tb[],
|
|
enum ipset_adt adt, u32 *lineno, u32 flags, bool retried)
|
|
{
|
|
struct hash_netiface *h = set->data;
|
|
ipset_adtfn adtfn = set->variant->adt[adt];
|
|
struct hash_netiface6_elem e = { .cidr = HOST_MASK, .elem = 1 };
|
|
struct ip_set_ext ext = IP_SET_INIT_UEXT(set);
|
|
char iface[IFNAMSIZ];
|
|
int ret;
|
|
|
|
if (unlikely(!tb[IPSET_ATTR_IP] ||
|
|
!tb[IPSET_ATTR_IFACE] ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_TIMEOUT) ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_CADT_FLAGS) ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_PACKETS) ||
|
|
!ip_set_optattr_netorder(tb, IPSET_ATTR_BYTES)))
|
|
return -IPSET_ERR_PROTOCOL;
|
|
if (unlikely(tb[IPSET_ATTR_IP_TO]))
|
|
return -IPSET_ERR_HASH_RANGE_UNSUPPORTED;
|
|
|
|
if (tb[IPSET_ATTR_LINENO])
|
|
*lineno = nla_get_u32(tb[IPSET_ATTR_LINENO]);
|
|
|
|
ret = ip_set_get_ipaddr6(tb[IPSET_ATTR_IP], &e.ip) ||
|
|
ip_set_get_extensions(set, tb, &ext);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (tb[IPSET_ATTR_CIDR])
|
|
e.cidr = nla_get_u8(tb[IPSET_ATTR_CIDR]);
|
|
if (e.cidr > HOST_MASK)
|
|
return -IPSET_ERR_INVALID_CIDR;
|
|
ip6_netmask(&e.ip, e.cidr);
|
|
|
|
strcpy(iface, nla_data(tb[IPSET_ATTR_IFACE]));
|
|
e.iface = iface;
|
|
ret = iface_test(&h->rbtree, &e.iface);
|
|
if (adt == IPSET_ADD) {
|
|
if (!ret) {
|
|
ret = iface_add(&h->rbtree, &e.iface);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
} else if (!ret)
|
|
return ret;
|
|
|
|
if (tb[IPSET_ATTR_CADT_FLAGS]) {
|
|
u32 cadt_flags = ip_set_get_h32(tb[IPSET_ATTR_CADT_FLAGS]);
|
|
if (cadt_flags & IPSET_FLAG_PHYSDEV)
|
|
e.physdev = 1;
|
|
if (cadt_flags & IPSET_FLAG_NOMATCH)
|
|
flags |= (IPSET_FLAG_NOMATCH << 16);
|
|
}
|
|
|
|
ret = adtfn(set, &e, &ext, &ext, flags);
|
|
|
|
return ip_set_enomatch(ret, flags, adt, set) ? -ret :
|
|
ip_set_eexist(ret, flags) ? 0 : ret;
|
|
}
|
|
|
|
static struct ip_set_type hash_netiface_type __read_mostly = {
|
|
.name = "hash:net,iface",
|
|
.protocol = IPSET_PROTOCOL,
|
|
.features = IPSET_TYPE_IP | IPSET_TYPE_IFACE |
|
|
IPSET_TYPE_NOMATCH,
|
|
.dimension = IPSET_DIM_TWO,
|
|
.family = NFPROTO_UNSPEC,
|
|
.revision_min = IPSET_TYPE_REV_MIN,
|
|
.revision_max = IPSET_TYPE_REV_MAX,
|
|
.create = hash_netiface_create,
|
|
.create_policy = {
|
|
[IPSET_ATTR_HASHSIZE] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_MAXELEM] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_PROBES] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_RESIZE] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_PROTO] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
|
|
},
|
|
.adt_policy = {
|
|
[IPSET_ATTR_IP] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_IP_TO] = { .type = NLA_NESTED },
|
|
[IPSET_ATTR_IFACE] = { .type = NLA_NUL_STRING,
|
|
.len = IFNAMSIZ - 1 },
|
|
[IPSET_ATTR_CADT_FLAGS] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_CIDR] = { .type = NLA_U8 },
|
|
[IPSET_ATTR_TIMEOUT] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_LINENO] = { .type = NLA_U32 },
|
|
[IPSET_ATTR_BYTES] = { .type = NLA_U64 },
|
|
[IPSET_ATTR_PACKETS] = { .type = NLA_U64 },
|
|
[IPSET_ATTR_COMMENT] = { .type = NLA_NUL_STRING },
|
|
},
|
|
.me = THIS_MODULE,
|
|
};
|
|
|
|
static int __init
|
|
hash_netiface_init(void)
|
|
{
|
|
return ip_set_type_register(&hash_netiface_type);
|
|
}
|
|
|
|
static void __exit
|
|
hash_netiface_fini(void)
|
|
{
|
|
ip_set_type_unregister(&hash_netiface_type);
|
|
}
|
|
|
|
module_init(hash_netiface_init);
|
|
module_exit(hash_netiface_fini);
|