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netfilter: nf_ct_helper: allocate 16 bytes for the helper and policy names 

This patch modifies the struct nf_conntrack_helper to allocate
the room for the helper name. The maximum length is 16 bytes
(this was already introduced in 2.6.24).

For the maximum length for expectation policy names, I have
also selected 16 bytes.

This patch is required by the follow-up patch to support
user-space connection tracking helpers.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2012-01-15 16:34:08 +01:00
parent d0daebc3d6
commit 3a8fc53a45
7 changed files with 14 additions and 31 deletions
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4
include/net/netfilter/nf_conntrack_expect.h
View File

@ -59,10 +59,12 @@ static inline struct net *nf_ct_exp_net(struct nf_conntrack_expect *exp)
return nf_ct_net(exp->master);
}
#define NF_CT_EXP_POLICY_NAME_LEN 16
struct nf_conntrack_expect_policy {
unsigned int max_expected;
unsigned int timeout;
const char *name;
char name[NF_CT_EXP_POLICY_NAME_LEN];
};
#define NF_CT_EXPECT_CLASS_DEFAULT 0

2
include/net/netfilter/nf_conntrack_helper.h
View File

@ -19,7 +19,7 @@ struct module;
struct nf_conntrack_helper {
struct hlist_node hnode; /* Internal use. */
const char *name; /* name of the module */
char name[NF_CT_HELPER_NAME_LEN]; /* name of the module */
struct module *me; /* pointer to self */
const struct nf_conntrack_expect_policy *expect_policy;

8
net/netfilter/nf_conntrack_ftp.c
View File

@ -512,7 +512,6 @@ out_update_nl:
}
static struct nf_conntrack_helper ftp[MAX_PORTS][2] __read_mostly;
static char ftp_names[MAX_PORTS][2][sizeof("ftp-65535")] __read_mostly;
static const struct nf_conntrack_expect_policy ftp_exp_policy = {
.max_expected = 1,
@ -541,7 +540,6 @@ static void nf_conntrack_ftp_fini(void)
static int __init nf_conntrack_ftp_init(void)
{
int i, j = -1, ret = 0;
char *tmpname;
ftp_buffer = kmalloc(65536, GFP_KERNEL);
if (!ftp_buffer)
@ -561,12 +559,10 @@ static int __init nf_conntrack_ftp_init(void)
ftp[i][j].expect_policy = &ftp_exp_policy;
ftp[i][j].me = THIS_MODULE;
ftp[i][j].help = help;
tmpname = &ftp_names[i][j][0];
if (ports[i] == FTP_PORT)
sprintf(tmpname, "ftp");
sprintf(ftp[i][j].name, "ftp");
else
sprintf(tmpname, "ftp-%d", ports[i]);
ftp[i][j].name = tmpname;
sprintf(ftp[i][j].name, "ftp-%d", ports[i]);
pr_debug("nf_ct_ftp: registering helper for pf: %d "
"port: %d\n",

8
net/netfilter/nf_conntrack_irc.c
View File

@ -221,7 +221,6 @@ static int help(struct sk_buff *skb, unsigned int protoff,
}
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);
@ -229,7 +228,6 @@ static void nf_conntrack_irc_fini(void);
static int __init nf_conntrack_irc_init(void)
{
int i, ret;
char *tmpname;
if (max_dcc_channels < 1) {
printk(KERN_ERR "nf_ct_irc: max_dcc_channels must not be zero\n");
@ -255,12 +253,10 @@ static int __init nf_conntrack_irc_init(void)
irc[i].me = THIS_MODULE;
irc[i].help = help;
tmpname = &irc_names[i][0];
if (ports[i] == IRC_PORT)
sprintf(tmpname, "irc");
sprintf(irc[i].name, "irc");
else
sprintf(tmpname, "irc-%u", i);
irc[i].name = tmpname;
sprintf(irc[i].name, "irc-%u", i);
ret = nf_conntrack_helper_register(&irc[i]);
if (ret) {

8
net/netfilter/nf_conntrack_sane.c
View File

@ -163,7 +163,6 @@ out:
}
static struct nf_conntrack_helper sane[MAX_PORTS][2] __read_mostly;
static char sane_names[MAX_PORTS][2][sizeof("sane-65535")] __read_mostly;
static const struct nf_conntrack_expect_policy sane_exp_policy = {
.max_expected = 1,
@ -190,7 +189,6 @@ static void nf_conntrack_sane_fini(void)
static int __init nf_conntrack_sane_init(void)
{
int i, j = -1, ret = 0;
char *tmpname;
sane_buffer = kmalloc(65536, GFP_KERNEL);
if (!sane_buffer)
@ -210,12 +208,10 @@ static int __init nf_conntrack_sane_init(void)
sane[i][j].expect_policy = &sane_exp_policy;
sane[i][j].me = THIS_MODULE;
sane[i][j].help = help;
tmpname = &sane_names[i][j][0];
if (ports[i] == SANE_PORT)
sprintf(tmpname, "sane");
sprintf(sane[i][j].name, "sane");
else
sprintf(tmpname, "sane-%d", ports[i]);
sane[i][j].name = tmpname;
sprintf(sane[i][j].name, "sane-%d", ports[i]);
pr_debug("nf_ct_sane: registering helper for pf: %d "
"port: %d\n",

7
net/netfilter/nf_conntrack_sip.c
View File

@ -1556,7 +1556,6 @@ static void nf_conntrack_sip_fini(void)
static int __init nf_conntrack_sip_init(void)
{
int i, j, ret;
char *tmpname;
if (ports_c == 0)
ports[ports_c++] = SIP_PORT;
@ -1584,12 +1583,10 @@ static int __init nf_conntrack_sip_init(void)
sip[i][j].expect_class_max = SIP_EXPECT_MAX;
sip[i][j].me = THIS_MODULE;
tmpname = &sip_names[i][j][0];
if (ports[i] == SIP_PORT)
sprintf(tmpname, "sip");
sprintf(sip_names[i][j], "sip");
else
sprintf(tmpname, "sip-%u", i);
sip[i][j].name = tmpname;
sprintf(sip_names[i][j], "sip-%u", i);
pr_debug("port #%u: %u\n", i, ports[i]);

8
net/netfilter/nf_conntrack_tftp.c
View File

@ -92,7 +92,6 @@ static int tftp_help(struct sk_buff *skb,
}
static struct nf_conntrack_helper tftp[MAX_PORTS][2] __read_mostly;
static char tftp_names[MAX_PORTS][2][sizeof("tftp-65535")] __read_mostly;
static const struct nf_conntrack_expect_policy tftp_exp_policy = {
.max_expected = 1,
@ -112,7 +111,6 @@ static void nf_conntrack_tftp_fini(void)
static int __init nf_conntrack_tftp_init(void)
{
int i, j, ret;
char *tmpname;
if (ports_c == 0)
ports[ports_c++] = TFTP_PORT;
@ -129,12 +127,10 @@ static int __init nf_conntrack_tftp_init(void)
tftp[i][j].me = THIS_MODULE;
tftp[i][j].help = tftp_help;
tmpname = &tftp_names[i][j][0];
if (ports[i] == TFTP_PORT)
sprintf(tmpname, "tftp");
sprintf(tftp[i][j].name, "tftp");
else
sprintf(tmpname, "tftp-%u", i);
tftp[i][j].name = tmpname;
sprintf(tftp[i][j].name, "tftp-%u", i);
ret = nf_conntrack_helper_register(&tftp[i][j]);
if (ret) {