#include <linux/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/in.h>
+#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/netfilter.h>
+#include <linux/slab.h>
#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
#define MAX_PORTS 8
static unsigned short ports[MAX_PORTS];
-static int ports_c;
+static unsigned int ports_c;
static unsigned int max_dcc_channels = 8;
static unsigned int dcc_timeout __read_mostly = 300;
/* This is slow, but it's simple. --RR */
static char *irc_buffer;
static DEFINE_SPINLOCK(irc_buffer_lock);
-unsigned int (*nf_nat_irc_hook)(struct sk_buff **pskb,
+unsigned int (*nf_nat_irc_hook)(struct sk_buff *skb,
enum ip_conntrack_info ctinfo,
unsigned int matchoff,
unsigned int matchlen,
MODULE_DESCRIPTION("IRC (DCC) connection tracking helper");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ip_conntrack_irc");
+MODULE_ALIAS_NFCT_HELPER("irc");
module_param_array(ports, ushort, &ports_c, 0400);
MODULE_PARM_DESC(ports, "port numbers of IRC servers");
module_param(dcc_timeout, uint, 0400);
MODULE_PARM_DESC(dcc_timeout, "timeout on for unestablished DCC channels");
-static const char *dccprotos[] = {
+static const char *const dccprotos[] = {
"SEND ", "CHAT ", "MOVE ", "TSEND ", "SCHAT "
};
#define MINMATCHLEN 5
-#if 0
-#define DEBUGP(format, args...) printk(KERN_DEBUG "%s:%s:" format, \
- __FILE__, __FUNCTION__ , ## args)
-#else
-#define DEBUGP(format, args...)
-#endif
-
/* tries to get the ip_addr and port out of a dcc command
* return value: -1 on failure, 0 on success
* data pointer to first byte of DCC command data
* ad_beg_p returns pointer to first byte of addr data
* ad_end_p returns pointer to last byte of addr data
*/
-static int parse_dcc(char *data, char *data_end, u_int32_t *ip,
+static int parse_dcc(char *data, const char *data_end, __be32 *ip,
u_int16_t *port, char **ad_beg_p, char **ad_end_p)
{
+ char *tmp;
+
/* at least 12: "AAAAAAAA P\1\n" */
while (*data++ != ' ')
if (data > data_end - 12)
return -1;
+ /* Make sure we have a newline character within the packet boundaries
+ * because simple_strtoul parses until the first invalid character. */
+ for (tmp = data; tmp <= data_end; tmp++)
+ if (*tmp == '\n')
+ break;
+ if (tmp > data_end || *tmp != '\n')
+ return -1;
+
*ad_beg_p = data;
- *ip = simple_strtoul(data, &data, 10);
+ *ip = cpu_to_be32(simple_strtoul(data, &data, 10));
/* skip blanks between ip and port */
while (*data == ' ') {
return 0;
}
-static int help(struct sk_buff **pskb, unsigned int protoff,
+static int help(struct sk_buff *skb, unsigned int protoff,
struct nf_conn *ct, enum ip_conntrack_info ctinfo)
{
unsigned int dataoff;
- struct tcphdr _tcph, *th;
- char *data, *data_limit, *ib_ptr;
+ const struct iphdr *iph;
+ const struct tcphdr *th;
+ struct tcphdr _tcph;
+ const char *data_limit;
+ char *data, *ib_ptr;
int dir = CTINFO2DIR(ctinfo);
struct nf_conntrack_expect *exp;
struct nf_conntrack_tuple *tuple;
- u_int32_t dcc_ip;
+ __be32 dcc_ip;
u_int16_t dcc_port;
__be16 port;
int i, ret = NF_ACCEPT;
return NF_ACCEPT;
/* Not a full tcp header? */
- th = skb_header_pointer(*pskb, protoff, sizeof(_tcph), &_tcph);
+ th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
if (th == NULL)
return NF_ACCEPT;
/* No data? */
dataoff = protoff + th->doff*4;
- if (dataoff >= (*pskb)->len)
+ if (dataoff >= skb->len)
return NF_ACCEPT;
spin_lock_bh(&irc_buffer_lock);
- ib_ptr = skb_header_pointer(*pskb, dataoff, (*pskb)->len - dataoff,
+ ib_ptr = skb_header_pointer(skb, dataoff, skb->len - dataoff,
irc_buffer);
BUG_ON(ib_ptr == NULL);
data = ib_ptr;
- data_limit = ib_ptr + (*pskb)->len - dataoff;
+ data_limit = ib_ptr + skb->len - dataoff;
/* strlen("\1DCC SENT t AAAAAAAA P\1\n")=24
* 5+MINMATCHLEN+strlen("t AAAAAAAA P\1\n")=14 */
data += 5;
/* we have at least (19+MINMATCHLEN)-5 bytes valid data left */
- DEBUGP("DCC found in master %u.%u.%u.%u:%u %u.%u.%u.%u:%u...\n",
- NIPQUAD(iph->saddr), ntohs(th->source),
- NIPQUAD(iph->daddr), ntohs(th->dest));
+ iph = ip_hdr(skb);
+ pr_debug("DCC found in master %pI4:%u %pI4:%u\n",
+ &iph->saddr, ntohs(th->source),
+ &iph->daddr, ntohs(th->dest));
for (i = 0; i < ARRAY_SIZE(dccprotos); i++) {
if (memcmp(data, dccprotos[i], strlen(dccprotos[i]))) {
continue;
}
data += strlen(dccprotos[i]);
- DEBUGP("DCC %s detected\n", dccprotos[i]);
+ pr_debug("DCC %s detected\n", dccprotos[i]);
/* we have at least
* (19+MINMATCHLEN)-5-dccprotos[i].matchlen bytes valid
* data left (== 14/13 bytes) */
- if (parse_dcc((char *)data, data_limit, &dcc_ip,
+ if (parse_dcc(data, data_limit, &dcc_ip,
&dcc_port, &addr_beg_p, &addr_end_p)) {
- DEBUGP("unable to parse dcc command\n");
+ pr_debug("unable to parse dcc command\n");
continue;
}
- DEBUGP("DCC bound ip/port: %u.%u.%u.%u:%u\n",
- HIPQUAD(dcc_ip), dcc_port);
+
+ pr_debug("DCC bound ip/port: %pI4:%u\n",
+ &dcc_ip, dcc_port);
/* dcc_ip can be the internal OR external (NAT'ed) IP */
tuple = &ct->tuplehash[dir].tuple;
- if (tuple->src.u3.ip != htonl(dcc_ip) &&
- tuple->dst.u3.ip != htonl(dcc_ip)) {
+ if (tuple->src.u3.ip != dcc_ip &&
+ tuple->dst.u3.ip != dcc_ip) {
if (net_ratelimit())
printk(KERN_WARNING
- "Forged DCC command from "
- "%u.%u.%u.%u: %u.%u.%u.%u:%u\n",
- NIPQUAD(tuple->src.u3.ip),
- HIPQUAD(dcc_ip), dcc_port);
+ "Forged DCC command from %pI4: %pI4:%u\n",
+ &tuple->src.u3.ip,
+ &dcc_ip, dcc_port);
continue;
}
- exp = nf_conntrack_expect_alloc(ct);
+ exp = nf_ct_expect_alloc(ct);
if (exp == NULL) {
ret = NF_DROP;
goto out;
}
tuple = &ct->tuplehash[!dir].tuple;
port = htons(dcc_port);
- nf_conntrack_expect_init(exp, tuple->src.l3num,
- NULL, &tuple->dst.u3,
- IPPROTO_TCP, NULL, &port);
+ nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
+ tuple->src.l3num,
+ NULL, &tuple->dst.u3,
+ IPPROTO_TCP, NULL, &port);
nf_nat_irc = rcu_dereference(nf_nat_irc_hook);
if (nf_nat_irc && ct->status & IPS_NAT_MASK)
- ret = nf_nat_irc(pskb, ctinfo,
+ ret = nf_nat_irc(skb, ctinfo,
addr_beg_p - ib_ptr,
addr_end_p - addr_beg_p,
exp);
- else if (nf_conntrack_expect_related(exp) != 0)
+ else if (nf_ct_expect_related(exp) != 0)
ret = NF_DROP;
- nf_conntrack_expect_put(exp);
+ nf_ct_expect_put(exp);
goto out;
}
}
static struct nf_conntrack_helper irc[MAX_PORTS] __read_mostly;
static char irc_names[MAX_PORTS][sizeof("irc-65535")] __read_mostly;
+static struct nf_conntrack_expect_policy irc_exp_policy;
static void nf_conntrack_irc_fini(void);
return -EINVAL;
}
+ irc_exp_policy.max_expected = max_dcc_channels;
+ irc_exp_policy.timeout = dcc_timeout;
+
irc_buffer = kmalloc(65536, GFP_KERNEL);
if (!irc_buffer)
return -ENOMEM;
irc[i].tuple.src.l3num = AF_INET;
irc[i].tuple.src.u.tcp.port = htons(ports[i]);
irc[i].tuple.dst.protonum = IPPROTO_TCP;
- irc[i].mask.src.l3num = 0xFFFF;
- irc[i].mask.src.u.tcp.port = htons(0xFFFF);
- irc[i].mask.dst.protonum = 0xFF;
- irc[i].max_expected = max_dcc_channels;
- irc[i].timeout = dcc_timeout;
+ irc[i].expect_policy = &irc_exp_policy;
irc[i].me = THIS_MODULE;
irc[i].help = help;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff