netfilter: Add helper array register/unregister functions
Add nf_ct_helper_init(), nf_conntrack_helpers_register() and nf_conntrack_helpers_unregister() functions to avoid repetitive opencoded initialization in helpers. This patch keeps an id parameter for nf_ct_helper_init() not to break helper matching by name that has been inconsistently exposed to userspace through ports, eg. ftp-2121, and through an incremental id, eg. tftp-1. Signed-off-by: Gao Feng <fgao@ikuai8.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Gao Feng
Pablo Neira Ayuso
Родитель
590025a27f
Коммит
82de0be686
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@ -58,10 +58,25 @@ struct nf_conntrack_helper *__nf_conntrack_helper_find(const char *name,
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struct nf_conntrack_helper *nf_conntrack_helper_try_module_get(const char *name,
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u16 l3num,
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u8 protonum);
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void nf_ct_helper_init(struct nf_conntrack_helper *helper,
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u16 l3num, u16 protonum, const char *name,
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u16 default_port, u16 spec_port, u32 id,
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const struct nf_conntrack_expect_policy *exp_pol,
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u32 expect_class_max, u32 data_len,
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int (*help)(struct sk_buff *skb, unsigned int protoff,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo),
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int (*from_nlattr)(struct nlattr *attr,
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struct nf_conn *ct),
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struct module *module);
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int nf_conntrack_helper_register(struct nf_conntrack_helper *);
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void nf_conntrack_helper_unregister(struct nf_conntrack_helper *);
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int nf_conntrack_helpers_register(struct nf_conntrack_helper *, unsigned int);
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void nf_conntrack_helpers_unregister(struct nf_conntrack_helper *,
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unsigned int);
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struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct,
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struct nf_conntrack_helper *helper,
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gfp_t gfp);
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@ -572,7 +572,7 @@ static int nf_ct_ftp_from_nlattr(struct nlattr *attr, struct nf_conn *ct)
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return 0;
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}
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static struct nf_conntrack_helper ftp[MAX_PORTS][2] __read_mostly;
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static struct nf_conntrack_helper ftp[MAX_PORTS * 2] __read_mostly;
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static const struct nf_conntrack_expect_policy ftp_exp_policy = {
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.max_expected = 1,
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@ -582,24 +582,13 @@ static const struct nf_conntrack_expect_policy ftp_exp_policy = {
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/* don't make this __exit, since it's called from __init ! */
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static void nf_conntrack_ftp_fini(void)
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{
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int i, j;
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for (i = 0; i < ports_c; i++) {
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for (j = 0; j < 2; j++) {
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if (ftp[i][j].me == NULL)
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continue;
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pr_debug("unregistering helper for pf: %d port: %d\n",
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ftp[i][j].tuple.src.l3num, ports[i]);
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nf_conntrack_helper_unregister(&ftp[i][j]);
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}
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}
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nf_conntrack_helpers_unregister(ftp, ports_c * 2);
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kfree(ftp_buffer);
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}
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static int __init nf_conntrack_ftp_init(void)
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{
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int i, j = -1, ret = 0;
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int i, ret = 0;
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ftp_buffer = kmalloc(65536, GFP_KERNEL);
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if (!ftp_buffer)
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@ -611,32 +600,21 @@ static int __init nf_conntrack_ftp_init(void)
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/* FIXME should be configurable whether IPv4 and IPv6 FTP connections
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are tracked or not - YK */
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for (i = 0; i < ports_c; i++) {
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ftp[i][0].tuple.src.l3num = PF_INET;
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ftp[i][1].tuple.src.l3num = PF_INET6;
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for (j = 0; j < 2; j++) {
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ftp[i][j].data_len = sizeof(struct nf_ct_ftp_master);
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ftp[i][j].tuple.src.u.tcp.port = htons(ports[i]);
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ftp[i][j].tuple.dst.protonum = IPPROTO_TCP;
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ftp[i][j].expect_policy = &ftp_exp_policy;
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ftp[i][j].me = THIS_MODULE;
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ftp[i][j].help = help;
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ftp[i][j].from_nlattr = nf_ct_ftp_from_nlattr;
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if (ports[i] == FTP_PORT)
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sprintf(ftp[i][j].name, "ftp");
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else
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sprintf(ftp[i][j].name, "ftp-%d", ports[i]);
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nf_ct_helper_init(&ftp[2 * i], AF_INET, IPPROTO_TCP, "ftp",
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FTP_PORT, ports[i], ports[i], &ftp_exp_policy,
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0, sizeof(struct nf_ct_ftp_master), help,
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nf_ct_ftp_from_nlattr, THIS_MODULE);
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nf_ct_helper_init(&ftp[2 * i + 1], AF_INET6, IPPROTO_TCP, "ftp",
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FTP_PORT, ports[i], ports[i], &ftp_exp_policy,
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0, sizeof(struct nf_ct_ftp_master), help,
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nf_ct_ftp_from_nlattr, THIS_MODULE);
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}
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pr_debug("registering helper for pf: %d port: %d\n",
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ftp[i][j].tuple.src.l3num, ports[i]);
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ret = nf_conntrack_helper_register(&ftp[i][j]);
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if (ret) {
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pr_err("failed to register helper for pf: %d port: %d\n",
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ftp[i][j].tuple.src.l3num, ports[i]);
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ports_c = i;
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nf_conntrack_ftp_fini();
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return ret;
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}
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}
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ret = nf_conntrack_helpers_register(ftp, ports_c * 2);
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if (ret < 0) {
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pr_err("failed to register helpers\n");
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kfree(ftp_buffer);
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return ret;
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}
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return 0;
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@ -465,6 +465,63 @@ restart:
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}
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EXPORT_SYMBOL_GPL(nf_conntrack_helper_unregister);
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void nf_ct_helper_init(struct nf_conntrack_helper *helper,
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u16 l3num, u16 protonum, const char *name,
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u16 default_port, u16 spec_port, u32 id,
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const struct nf_conntrack_expect_policy *exp_pol,
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u32 expect_class_max, u32 data_len,
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int (*help)(struct sk_buff *skb, unsigned int protoff,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo),
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int (*from_nlattr)(struct nlattr *attr,
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struct nf_conn *ct),
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struct module *module)
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{
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helper->tuple.src.l3num = l3num;
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helper->tuple.dst.protonum = protonum;
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helper->tuple.src.u.all = htons(spec_port);
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helper->expect_policy = exp_pol;
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helper->expect_class_max = expect_class_max;
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helper->data_len = data_len;
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helper->help = help;
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helper->from_nlattr = from_nlattr;
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helper->me = module;
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if (spec_port == default_port)
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snprintf(helper->name, sizeof(helper->name), "%s", name);
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else
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snprintf(helper->name, sizeof(helper->name), "%s-%u", name, id);
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}
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EXPORT_SYMBOL_GPL(nf_ct_helper_init);
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int nf_conntrack_helpers_register(struct nf_conntrack_helper *helper,
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unsigned int n)
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{
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unsigned int i;
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int err = 0;
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for (i = 0; i < n; i++) {
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err = nf_conntrack_helper_register(&helper[i]);
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if (err < 0)
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goto err;
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}
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return err;
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err:
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if (i > 0)
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nf_conntrack_helpers_unregister(helper, i);
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return err;
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}
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EXPORT_SYMBOL_GPL(nf_conntrack_helpers_register);
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void nf_conntrack_helpers_unregister(struct nf_conntrack_helper *helper,
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unsigned int n)
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{
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while (n-- > 0)
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nf_conntrack_helper_unregister(&helper[n]);
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}
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EXPORT_SYMBOL_GPL(nf_conntrack_helpers_unregister);
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static struct nf_ct_ext_type helper_extend __read_mostly = {
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.len = sizeof(struct nf_conn_help),
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.align = __alignof__(struct nf_conn_help),
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@ -255,27 +255,18 @@ static int __init nf_conntrack_irc_init(void)
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ports[ports_c++] = IRC_PORT;
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for (i = 0; i < ports_c; i++) {
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irc[i].tuple.src.l3num = AF_INET;
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irc[i].tuple.src.u.tcp.port = htons(ports[i]);
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irc[i].tuple.dst.protonum = IPPROTO_TCP;
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irc[i].expect_policy = &irc_exp_policy;
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irc[i].me = THIS_MODULE;
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irc[i].help = help;
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if (ports[i] == IRC_PORT)
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sprintf(irc[i].name, "irc");
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else
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sprintf(irc[i].name, "irc-%u", i);
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ret = nf_conntrack_helper_register(&irc[i]);
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if (ret) {
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pr_err("failed to register helper for pf: %u port: %u\n",
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irc[i].tuple.src.l3num, ports[i]);
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ports_c = i;
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nf_conntrack_irc_fini();
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return ret;
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}
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nf_ct_helper_init(&irc[i], AF_INET, IPPROTO_TCP, "irc",
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IRC_PORT, ports[i], i, &irc_exp_policy,
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0, 0, help, NULL, THIS_MODULE);
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}
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ret = nf_conntrack_helpers_register(&irc[0], ports_c);
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if (ret) {
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pr_err("failed to register helpers\n");
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kfree(irc_buffer);
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return ret;
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}
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return 0;
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}
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@ -283,10 +274,7 @@ static int __init nf_conntrack_irc_init(void)
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* it is needed by the init function */
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static void nf_conntrack_irc_fini(void)
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{
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int i;
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for (i = 0; i < ports_c; i++)
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nf_conntrack_helper_unregister(&irc[i]);
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nf_conntrack_helpers_unregister(irc, ports_c);
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kfree(irc_buffer);
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}
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@ -166,7 +166,7 @@ out:
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return ret;
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}
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static struct nf_conntrack_helper sane[MAX_PORTS][2] __read_mostly;
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static struct nf_conntrack_helper sane[MAX_PORTS * 2] __read_mostly;
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static const struct nf_conntrack_expect_policy sane_exp_policy = {
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.max_expected = 1,
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@ -176,22 +176,13 @@ static const struct nf_conntrack_expect_policy sane_exp_policy = {
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/* don't make this __exit, since it's called from __init ! */
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static void nf_conntrack_sane_fini(void)
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{
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int i, j;
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for (i = 0; i < ports_c; i++) {
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for (j = 0; j < 2; j++) {
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pr_debug("unregistering helper for pf: %d port: %d\n",
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sane[i][j].tuple.src.l3num, ports[i]);
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nf_conntrack_helper_unregister(&sane[i][j]);
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}
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}
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nf_conntrack_helpers_unregister(sane, ports_c * 2);
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kfree(sane_buffer);
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}
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static int __init nf_conntrack_sane_init(void)
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{
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int i, j = -1, ret = 0;
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int i, ret = 0;
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sane_buffer = kmalloc(65536, GFP_KERNEL);
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if (!sane_buffer)
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@ -203,31 +194,23 @@ static int __init nf_conntrack_sane_init(void)
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/* FIXME should be configurable whether IPv4 and IPv6 connections
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are tracked or not - YK */
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for (i = 0; i < ports_c; i++) {
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sane[i][0].tuple.src.l3num = PF_INET;
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sane[i][1].tuple.src.l3num = PF_INET6;
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for (j = 0; j < 2; j++) {
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sane[i][j].data_len = sizeof(struct nf_ct_sane_master);
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sane[i][j].tuple.src.u.tcp.port = htons(ports[i]);
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sane[i][j].tuple.dst.protonum = IPPROTO_TCP;
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sane[i][j].expect_policy = &sane_exp_policy;
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sane[i][j].me = THIS_MODULE;
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sane[i][j].help = help;
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if (ports[i] == SANE_PORT)
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sprintf(sane[i][j].name, "sane");
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else
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sprintf(sane[i][j].name, "sane-%d", ports[i]);
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nf_ct_helper_init(&sane[2 * i], AF_INET, IPPROTO_TCP, "sane",
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SANE_PORT, ports[i], ports[i],
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&sane_exp_policy, 0,
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sizeof(struct nf_ct_sane_master), help, NULL,
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THIS_MODULE);
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nf_ct_helper_init(&sane[2 * i + 1], AF_INET6, IPPROTO_TCP, "sane",
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SANE_PORT, ports[i], ports[i],
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&sane_exp_policy, 0,
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sizeof(struct nf_ct_sane_master), help, NULL,
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THIS_MODULE);
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}
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pr_debug("registering helper for pf: %d port: %d\n",
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sane[i][j].tuple.src.l3num, ports[i]);
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ret = nf_conntrack_helper_register(&sane[i][j]);
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if (ret) {
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pr_err("failed to register helper for pf: %d port: %d\n",
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sane[i][j].tuple.src.l3num, ports[i]);
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ports_c = i;
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nf_conntrack_sane_fini();
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return ret;
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}
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}
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ret = nf_conntrack_helpers_register(sane, ports_c * 2);
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if (ret < 0) {
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pr_err("failed to register helpers\n");
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kfree(sane_buffer);
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return ret;
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}
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return 0;
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@ -1589,7 +1589,7 @@ static int sip_help_udp(struct sk_buff *skb, unsigned int protoff,
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return process_sip_msg(skb, ct, protoff, dataoff, &dptr, &datalen);
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}
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static struct nf_conntrack_helper sip[MAX_PORTS][4] __read_mostly;
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static struct nf_conntrack_helper sip[MAX_PORTS * 4] __read_mostly;
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static const struct nf_conntrack_expect_policy sip_exp_policy[SIP_EXPECT_MAX + 1] = {
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[SIP_EXPECT_SIGNALLING] = {
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@ -1616,20 +1616,12 @@ static const struct nf_conntrack_expect_policy sip_exp_policy[SIP_EXPECT_MAX + 1
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static void nf_conntrack_sip_fini(void)
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{
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int i, j;
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for (i = 0; i < ports_c; i++) {
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for (j = 0; j < ARRAY_SIZE(sip[i]); j++) {
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if (sip[i][j].me == NULL)
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continue;
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nf_conntrack_helper_unregister(&sip[i][j]);
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}
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}
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nf_conntrack_helpers_unregister(sip, ports_c * 4);
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}
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static int __init nf_conntrack_sip_init(void)
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{
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int i, j, ret;
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int i, ret;
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if (ports_c == 0)
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ports[ports_c++] = SIP_PORT;
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@ -1637,43 +1629,32 @@ static int __init nf_conntrack_sip_init(void)
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for (i = 0; i < ports_c; i++) {
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memset(&sip[i], 0, sizeof(sip[i]));
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sip[i][0].tuple.src.l3num = AF_INET;
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sip[i][0].tuple.dst.protonum = IPPROTO_UDP;
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sip[i][0].help = sip_help_udp;
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sip[i][1].tuple.src.l3num = AF_INET;
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sip[i][1].tuple.dst.protonum = IPPROTO_TCP;
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sip[i][1].help = sip_help_tcp;
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nf_ct_helper_init(&sip[4 * i], AF_INET, IPPROTO_UDP, "sip",
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SIP_PORT, ports[i], i, sip_exp_policy,
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SIP_EXPECT_MAX,
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sizeof(struct nf_ct_sip_master), sip_help_udp,
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NULL, THIS_MODULE);
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nf_ct_helper_init(&sip[4 * i + 1], AF_INET, IPPROTO_TCP, "sip",
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SIP_PORT, ports[i], i, sip_exp_policy,
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SIP_EXPECT_MAX,
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sizeof(struct nf_ct_sip_master), sip_help_tcp,
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NULL, THIS_MODULE);
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nf_ct_helper_init(&sip[4 * i + 2], AF_INET6, IPPROTO_UDP, "sip",
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SIP_PORT, ports[i], i, sip_exp_policy,
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SIP_EXPECT_MAX,
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sizeof(struct nf_ct_sip_master), sip_help_udp,
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NULL, THIS_MODULE);
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nf_ct_helper_init(&sip[4 * i + 3], AF_INET6, IPPROTO_TCP, "sip",
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SIP_PORT, ports[i], i, sip_exp_policy,
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SIP_EXPECT_MAX,
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sizeof(struct nf_ct_sip_master), sip_help_tcp,
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NULL, THIS_MODULE);
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}
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sip[i][2].tuple.src.l3num = AF_INET6;
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sip[i][2].tuple.dst.protonum = IPPROTO_UDP;
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sip[i][2].help = sip_help_udp;
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sip[i][3].tuple.src.l3num = AF_INET6;
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sip[i][3].tuple.dst.protonum = IPPROTO_TCP;
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sip[i][3].help = sip_help_tcp;
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for (j = 0; j < ARRAY_SIZE(sip[i]); j++) {
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sip[i][j].data_len = sizeof(struct nf_ct_sip_master);
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sip[i][j].tuple.src.u.udp.port = htons(ports[i]);
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sip[i][j].expect_policy = sip_exp_policy;
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sip[i][j].expect_class_max = SIP_EXPECT_MAX;
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sip[i][j].me = THIS_MODULE;
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if (ports[i] == SIP_PORT)
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sprintf(sip[i][j].name, "sip");
|
||||
else
|
||||
sprintf(sip[i][j].name, "sip-%u", i);
|
||||
|
||||
pr_debug("port #%u: %u\n", i, ports[i]);
|
||||
|
||||
ret = nf_conntrack_helper_register(&sip[i][j]);
|
||||
if (ret) {
|
||||
pr_err("failed to register helper for pf: %u port: %u\n",
|
||||
sip[i][j].tuple.src.l3num, ports[i]);
|
||||
ports_c = i;
|
||||
nf_conntrack_sip_fini();
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
ret = nf_conntrack_helpers_register(sip, ports_c * 4);
|
||||
if (ret < 0) {
|
||||
pr_err("failed to register helpers\n");
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -97,7 +97,7 @@ static int tftp_help(struct sk_buff *skb,
|
|||
return ret;
|
||||
}
|
||||
|
||||
static struct nf_conntrack_helper tftp[MAX_PORTS][2] __read_mostly;
|
||||
static struct nf_conntrack_helper tftp[MAX_PORTS * 2] __read_mostly;
|
||||
|
||||
static const struct nf_conntrack_expect_policy tftp_exp_policy = {
|
||||
.max_expected = 1,
|
||||
|
|
@ -106,47 +106,29 @@ static const struct nf_conntrack_expect_policy tftp_exp_policy = {
|
|||
|
||||
static void nf_conntrack_tftp_fini(void)
|
||||
{
|
||||
int i, j;
|
||||
|
||||
for (i = 0; i < ports_c; i++) {
|
||||
for (j = 0; j < 2; j++)
|
||||
nf_conntrack_helper_unregister(&tftp[i][j]);
|
||||
}
|
||||
nf_conntrack_helpers_unregister(tftp, ports_c * 2);
|
||||
}
|
||||
|
||||
static int __init nf_conntrack_tftp_init(void)
|
||||
{
|
||||
int i, j, ret;
|
||||
int i, ret;
|
||||
|
||||
if (ports_c == 0)
|
||||
ports[ports_c++] = TFTP_PORT;
|
||||
|
||||
for (i = 0; i < ports_c; i++) {
|
||||
memset(&tftp[i], 0, sizeof(tftp[i]));
|
||||
nf_ct_helper_init(&tftp[2 * i], AF_INET, IPPROTO_UDP, "tftp",
|
||||
TFTP_PORT, ports[i], i, &tftp_exp_policy,
|
||||
0, 0, tftp_help, NULL, THIS_MODULE);
|
||||
nf_ct_helper_init(&tftp[2 * i + 1], AF_INET6, IPPROTO_UDP, "tftp",
|
||||
TFTP_PORT, ports[i], i, &tftp_exp_policy,
|
||||
0, 0, tftp_help, NULL, THIS_MODULE);
|
||||
}
|
||||
|
||||
tftp[i][0].tuple.src.l3num = AF_INET;
|
||||
tftp[i][1].tuple.src.l3num = AF_INET6;
|
||||
for (j = 0; j < 2; j++) {
|
||||
tftp[i][j].tuple.dst.protonum = IPPROTO_UDP;
|
||||
tftp[i][j].tuple.src.u.udp.port = htons(ports[i]);
|
||||
tftp[i][j].expect_policy = &tftp_exp_policy;
|
||||
tftp[i][j].me = THIS_MODULE;
|
||||
tftp[i][j].help = tftp_help;
|
||||
|
||||
if (ports[i] == TFTP_PORT)
|
||||
sprintf(tftp[i][j].name, "tftp");
|
||||
else
|
||||
sprintf(tftp[i][j].name, "tftp-%u", i);
|
||||
|
||||
ret = nf_conntrack_helper_register(&tftp[i][j]);
|
||||
if (ret) {
|
||||
pr_err("failed to register helper for pf: %u port: %u\n",
|
||||
tftp[i][j].tuple.src.l3num, ports[i]);
|
||||
ports_c = i;
|
||||
nf_conntrack_tftp_fini();
|
||||
return ret;
|
||||
}
|
||||
}
|
||||
ret = nf_conntrack_helpers_register(tftp, ports_c * 2);
|
||||
if (ret < 0) {
|
||||
pr_err("failed to register helpers\n");
|
||||
return ret;
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
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