Annotation of embedaddon/dnsmasq/src/ipset.c, revision 1.1.1.1
1.1 misho 1: /* ipset.c is Copyright (c) 2013 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
2:
3: This program is free software; you can redistribute it and/or modify
4: it under the terms of the GNU General Public License as published by
5: the Free Software Foundation; version 2 dated June, 1991, or
6: (at your option) version 3 dated 29 June, 2007.
7:
8: This program is distributed in the hope that it will be useful,
9: but WITHOUT ANY WARRANTY; without even the implied warranty of
10: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11: GNU General Public License for more details.
12:
13: You should have received a copy of the GNU General Public License
14: along with this program. If not, see <http://www.gnu.org/licenses/>.
15: */
16:
17: #include "dnsmasq.h"
18:
19: #ifdef HAVE_IPSET
20:
21: #include <string.h>
22: #include <errno.h>
23: #include <sys/types.h>
24: #include <sys/socket.h>
25: #include <sys/utsname.h>
26: #include <arpa/inet.h>
27: #include <linux/version.h>
28: #include <linux/netlink.h>
29: #include <linux/netfilter/nfnetlink.h>
30: #ifndef NFNL_SUBSYS_IPSET
31: #define NFNL_SUBSYS_IPSET 6
32: #define IPSET_ATTR_DATA 7
33: #define IPSET_ATTR_IP 1
34: #define IPSET_ATTR_IPADDR_IPV4 1
35: #define IPSET_ATTR_IPADDR_IPV6 2
36: #define IPSET_ATTR_PROTOCOL 1
37: #define IPSET_ATTR_SETNAME 2
38: #define IPSET_CMD_ADD 9
39: #define IPSET_CMD_DEL 10
40: #define IPSET_MAXNAMELEN 32
41: #define IPSET_PROTOCOL 6
42: #else
43: #include <linux/netfilter/ipset/ip_set.h>
44: #endif
45:
46: /* data structure size in here is fixed */
47: #define BUFF_SZ 256
48:
49: #define NL_ALIGN(len) (((len)+3) & ~(3))
50: static const struct sockaddr_nl snl = { .nl_family = AF_NETLINK };
51: static int ipset_sock, old_kernel;
52: static char *buffer;
53:
54: static inline void add_attr(struct nlmsghdr *nlh, uint16_t type, size_t len, const void *data)
55: {
56: struct nlattr *attr = (void *)nlh + NL_ALIGN(nlh->nlmsg_len);
57: uint16_t payload_len = NL_ALIGN(sizeof(struct nlattr)) + len;
58: attr->nla_type = type;
59: attr->nla_len = payload_len;
60: memcpy((void *)attr + NL_ALIGN(sizeof(struct nlattr)), data, len);
61: nlh->nlmsg_len += NL_ALIGN(payload_len);
62: }
63:
64: void ipset_init(void)
65: {
66: struct utsname utsname;
67: int version;
68: char *split;
69:
70: if (uname(&utsname) < 0)
71: die(_("failed to find kernel version: %s"), NULL, EC_MISC);
72:
73: split = strtok(utsname.release, ".");
74: version = (split ? atoi(split) : 0);
75: split = strtok(NULL, ".");
76: version = version * 256 + (split ? atoi(split) : 0);
77: split = strtok(NULL, ".");
78: version = version * 256 + (split ? atoi(split) : 0);
79: old_kernel = (version < KERNEL_VERSION(2,6,32));
80:
81: if (old_kernel && (ipset_sock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) != -1)
82: return;
83:
84: if (!old_kernel &&
85: (buffer = safe_malloc(BUFF_SZ)) &&
86: (ipset_sock = socket(AF_NETLINK, SOCK_RAW, NETLINK_NETFILTER)) != -1 &&
87: (bind(ipset_sock, (struct sockaddr *)&snl, sizeof(snl)) != -1))
88: return;
89:
90: die (_("failed to create IPset control socket: %s"), NULL, EC_MISC);
91: }
92:
93: static int new_add_to_ipset(const char *setname, const struct all_addr *ipaddr, int af, int remove)
94: {
95: struct nlmsghdr *nlh;
96: struct nfgenmsg *nfg;
97: struct nlattr *nested[2];
98: uint8_t proto;
99: int addrsz = INADDRSZ;
100: ssize_t rc;
101:
102: #ifdef HAVE_IPV6
103: if (af == AF_INET6)
104: addrsz = IN6ADDRSZ;
105: #endif
106:
107: if (strlen(setname) >= IPSET_MAXNAMELEN)
108: {
109: errno = ENAMETOOLONG;
110: return -1;
111: }
112:
113: memset(buffer, 0, sizeof(buffer));
114:
115: nlh = (struct nlmsghdr *)buffer;
116: nlh->nlmsg_len = NL_ALIGN(sizeof(struct nlmsghdr));
117: nlh->nlmsg_type = (remove ? IPSET_CMD_DEL : IPSET_CMD_ADD) | (NFNL_SUBSYS_IPSET << 8);
118: nlh->nlmsg_flags = NLM_F_REQUEST;
119:
120: nfg = (struct nfgenmsg *)(buffer + nlh->nlmsg_len);
121: nlh->nlmsg_len += NL_ALIGN(sizeof(struct nfgenmsg));
122: nfg->nfgen_family = af;
123: nfg->version = NFNETLINK_V0;
124: nfg->res_id = htons(0);
125:
126: proto = IPSET_PROTOCOL;
127: add_attr(nlh, IPSET_ATTR_PROTOCOL, sizeof(proto), &proto);
128: add_attr(nlh, IPSET_ATTR_SETNAME, strlen(setname) + 1, setname);
129: nested[0] = (struct nlattr *)(buffer + NL_ALIGN(nlh->nlmsg_len));
130: nlh->nlmsg_len += NL_ALIGN(sizeof(struct nlattr));
131: nested[0]->nla_type = NLA_F_NESTED | IPSET_ATTR_DATA;
132: nested[1] = (struct nlattr *)(buffer + NL_ALIGN(nlh->nlmsg_len));
133: nlh->nlmsg_len += NL_ALIGN(sizeof(struct nlattr));
134: nested[1]->nla_type = NLA_F_NESTED | IPSET_ATTR_IP;
135: add_attr(nlh,
136: (af == AF_INET ? IPSET_ATTR_IPADDR_IPV4 : IPSET_ATTR_IPADDR_IPV6) | NLA_F_NET_BYTEORDER,
137: addrsz, &ipaddr->addr);
138: nested[1]->nla_len = (void *)buffer + NL_ALIGN(nlh->nlmsg_len) - (void *)nested[1];
139: nested[0]->nla_len = (void *)buffer + NL_ALIGN(nlh->nlmsg_len) - (void *)nested[0];
140:
141: while ((rc = sendto(ipset_sock, buffer, nlh->nlmsg_len, 0,
142: (struct sockaddr *)&snl, sizeof(snl))) == -1 && retry_send());
143: return rc;
144: }
145:
146:
147: static int old_add_to_ipset(const char *setname, const struct all_addr *ipaddr, int remove)
148: {
149: socklen_t size;
150: struct ip_set_req_adt_get {
151: unsigned op;
152: unsigned version;
153: union {
154: char name[IPSET_MAXNAMELEN];
155: uint16_t index;
156: } set;
157: char typename[IPSET_MAXNAMELEN];
158: } req_adt_get;
159: struct ip_set_req_adt {
160: unsigned op;
161: uint16_t index;
162: uint32_t ip;
163: } req_adt;
164:
165: if (strlen(setname) >= sizeof(req_adt_get.set.name))
166: {
167: errno = ENAMETOOLONG;
168: return -1;
169: }
170:
171: req_adt_get.op = 0x10;
172: req_adt_get.version = 3;
173: strcpy(req_adt_get.set.name, setname);
174: size = sizeof(req_adt_get);
175: if (getsockopt(ipset_sock, SOL_IP, 83, &req_adt_get, &size) < 0)
176: return -1;
177: req_adt.op = remove ? 0x102 : 0x101;
178: req_adt.index = req_adt_get.set.index;
179: req_adt.ip = ntohl(ipaddr->addr.addr4.s_addr);
180: if (setsockopt(ipset_sock, SOL_IP, 83, &req_adt, sizeof(req_adt)) < 0)
181: return -1;
182:
183: return 0;
184: }
185:
186:
187:
188: int add_to_ipset(const char *setname, const struct all_addr *ipaddr, int flags, int remove)
189: {
190: int af = AF_INET;
191:
192: #ifdef HAVE_IPV6
193: if (flags & F_IPV6)
194: {
195: af = AF_INET6;
196: /* old method only supports IPv4 */
197: if (old_kernel)
198: return -1;
199: }
200: #endif
201:
202: return old_kernel ? old_add_to_ipset(setname, ipaddr, remove) : new_add_to_ipset(setname, ipaddr, af, remove);
203: }
204:
205: #endif
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