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/* ipset.c is Copyright (c) 2013 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
#if defined(HAVE_IPSET) && defined(HAVE_LINUX_NETWORK)
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/utsname.h>
#include <arpa/inet.h>
#include <linux/version.h>
#include <linux/netlink.h>
/* We want to be able to compile against old header files
Kernel version is handled at run-time. */
#define NFNL_SUBSYS_IPSET 6
#define IPSET_ATTR_DATA 7
#define IPSET_ATTR_IP 1
#define IPSET_ATTR_IPADDR_IPV4 1
#define IPSET_ATTR_IPADDR_IPV6 2
#define IPSET_ATTR_PROTOCOL 1
#define IPSET_ATTR_SETNAME 2
#define IPSET_CMD_ADD 9
#define IPSET_CMD_DEL 10
#define IPSET_MAXNAMELEN 32
#define IPSET_PROTOCOL 6
#ifndef NFNETLINK_V0
#define NFNETLINK_V0 0
#endif
#ifndef NLA_F_NESTED
#define NLA_F_NESTED (1 << 15)
#endif
#ifndef NLA_F_NET_BYTEORDER
#define NLA_F_NET_BYTEORDER (1 << 14)
#endif
struct my_nlattr {
__u16 nla_len;
__u16 nla_type;
};
struct my_nfgenmsg {
__u8 nfgen_family; /* AF_xxx */
__u8 version; /* nfnetlink version */
__be16 res_id; /* resource id */
};
/* data structure size in here is fixed */
#define BUFF_SZ 256
#define NL_ALIGN(len) (((len)+3) & ~(3))
static const struct sockaddr_nl snl = { .nl_family = AF_NETLINK };
static int ipset_sock, old_kernel;
static char *buffer;
static inline void add_attr(struct nlmsghdr *nlh, uint16_t type, size_t len, const void *data)
{
struct my_nlattr *attr = (void *)nlh + NL_ALIGN(nlh->nlmsg_len);
uint16_t payload_len = NL_ALIGN(sizeof(struct my_nlattr)) + len;
attr->nla_type = type;
attr->nla_len = payload_len;
memcpy((void *)attr + NL_ALIGN(sizeof(struct my_nlattr)), data, len);
nlh->nlmsg_len += NL_ALIGN(payload_len);
}
void ipset_init(void)
{
struct utsname utsname;
int version;
char *split;
if (uname(&utsname) < 0)
die(_("failed to find kernel version: %s"), NULL, EC_MISC);
split = strtok(utsname.release, ".");
version = (split ? atoi(split) : 0);
split = strtok(NULL, ".");
version = version * 256 + (split ? atoi(split) : 0);
split = strtok(NULL, ".");
version = version * 256 + (split ? atoi(split) : 0);
old_kernel = (version < KERNEL_VERSION(2,6,32));
if (old_kernel && (ipset_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) != -1)
return;
if (!old_kernel &&
(buffer = safe_malloc(BUFF_SZ)) &&
(ipset_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER)) != -1 &&
(bind(ipset_sock, (struct sockaddr *)&snl, sizeof(snl)) != -1))
return;
die (_("failed to create IPset control socket: %s"), NULL, EC_MISC);
}
static int new_add_to_ipset(const char *setname, const struct all_addr *ipaddr, int af, int remove)
{
struct nlmsghdr *nlh;
struct my_nfgenmsg *nfg;
struct my_nlattr *nested[2];
uint8_t proto;
int addrsz = INADDRSZ;
#ifdef HAVE_IPV6
if (af == AF_INET6)
addrsz = IN6ADDRSZ;
#endif
if (strlen(setname) >= IPSET_MAXNAMELEN)
{
errno = ENAMETOOLONG;
return -1;
}
memset(buffer, 0, BUFF_SZ);
nlh = (struct nlmsghdr *)buffer;
nlh->nlmsg_len = NL_ALIGN(sizeof(struct nlmsghdr));
nlh->nlmsg_type = (remove ? IPSET_CMD_DEL : IPSET_CMD_ADD) | (NFNL_SUBSYS_IPSET << 8);
nlh->nlmsg_flags = NLM_F_REQUEST;
nfg = (struct my_nfgenmsg *)(buffer + nlh->nlmsg_len);
nlh->nlmsg_len += NL_ALIGN(sizeof(struct my_nfgenmsg));
nfg->nfgen_family = af;
nfg->version = NFNETLINK_V0;
nfg->res_id = htons(0);
proto = IPSET_PROTOCOL;
add_attr(nlh, IPSET_ATTR_PROTOCOL, sizeof(proto), &proto);
add_attr(nlh, IPSET_ATTR_SETNAME, strlen(setname) + 1, setname);
nested[0] = (struct my_nlattr *)(buffer + NL_ALIGN(nlh->nlmsg_len));
nlh->nlmsg_len += NL_ALIGN(sizeof(struct my_nlattr));
nested[0]->nla_type = NLA_F_NESTED | IPSET_ATTR_DATA;
nested[1] = (struct my_nlattr *)(buffer + NL_ALIGN(nlh->nlmsg_len));
nlh->nlmsg_len += NL_ALIGN(sizeof(struct my_nlattr));
nested[1]->nla_type = NLA_F_NESTED | IPSET_ATTR_IP;
add_attr(nlh,
(af == AF_INET ? IPSET_ATTR_IPADDR_IPV4 : IPSET_ATTR_IPADDR_IPV6) | NLA_F_NET_BYTEORDER,
addrsz, &ipaddr->addr);
nested[1]->nla_len = (void *)buffer + NL_ALIGN(nlh->nlmsg_len) - (void *)nested[1];
nested[0]->nla_len = (void *)buffer + NL_ALIGN(nlh->nlmsg_len) - (void *)nested[0];
while (retry_send(sendto(ipset_sock, buffer, nlh->nlmsg_len, 0,
(struct sockaddr *)&snl, sizeof(snl))));
return errno == 0 ? 0 : -1;
}
static int old_add_to_ipset(const char *setname, const struct all_addr *ipaddr, int remove)
{
socklen_t size;
struct ip_set_req_adt_get {
unsigned op;
unsigned version;
union {
char name[IPSET_MAXNAMELEN];
uint16_t index;
} set;
char typename[IPSET_MAXNAMELEN];
} req_adt_get;
struct ip_set_req_adt {
unsigned op;
uint16_t index;
uint32_t ip;
} req_adt;
if (strlen(setname) >= sizeof(req_adt_get.set.name))
{
errno = ENAMETOOLONG;
return -1;
}
req_adt_get.op = 0x10;
req_adt_get.version = 3;
strcpy(req_adt_get.set.name, setname);
size = sizeof(req_adt_get);
if (getsockopt(ipset_sock, SOL_IP, 83, &req_adt_get, &size) < 0)
return -1;
req_adt.op = remove ? 0x102 : 0x101;
req_adt.index = req_adt_get.set.index;
req_adt.ip = ntohl(ipaddr->addr.addr4.s_addr);
if (setsockopt(ipset_sock, SOL_IP, 83, &req_adt, sizeof(req_adt)) < 0)
return -1;
return 0;
}
int add_to_ipset(const char *setname, const struct all_addr *ipaddr, int flags, int remove)
{
int ret = 0, af = AF_INET;
#ifdef HAVE_IPV6
if (flags & F_IPV6)
{
af = AF_INET6;
/* old method only supports IPv4 */
if (old_kernel)
{
errno = EAFNOSUPPORT ;
ret = -1;
}
}
#endif
if (ret != -1)
ret = old_kernel ? old_add_to_ipset(setname, ipaddr, remove) : new_add_to_ipset(setname, ipaddr, af, remove);
if (ret == -1)
my_syslog(LOG_ERR, _("failed to update ipset %s: %s"), setname, strerror(errno));
return ret;
}
#endif
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