netfilter: xt_SECMARK: add new revision to fix structure layout

This extension breaks when trying to delete rules, add a new revision to
fix this.

Fixes: 5e6874cdb8de ("[SECMARK]: Add xtables SECMARK target")
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/include/uapi/linux/netfilter/xt_SECMARK.h b/include/uapi/linux/netfilter/xt_SECMARK.h
index 1f2a708413f5db0c8c3a9fb0548e5fd991d9b57a..beb2cadba8a9c77a63299bc088af6c75c27b8076 100644 (file)
--- a/include/uapi/linux/netfilter/xt_SECMARK.h
+++ b/include/uapi/linux/netfilter/xt_SECMARK.h
@@ -20,4 +20,10 @@ struct xt_secmark_target_info {
        char secctx[SECMARK_SECCTX_MAX];
 };
 
+struct xt_secmark_target_info_v1 {
+       __u8 mode;
+       char secctx[SECMARK_SECCTX_MAX];
+       __u32 secid;
+};
+
 #endif /*_XT_SECMARK_H_target */

diff --git a/net/netfilter/xt_SECMARK.c b/net/netfilter/xt_SECMARK.c
index 75625d13e976c70dd8fac8d4609700a50022dd18..498a0bf6f0444a80dd88f05299bf0a7b505dd587 100644 (file)
--- a/net/netfilter/xt_SECMARK.c
+++ b/net/netfilter/xt_SECMARK.c
@@ -24,10 +24,9 @@ MODULE_ALIAS("ip6t_SECMARK");
 static u8 mode;
 
 static unsigned int
-secmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
+secmark_tg(struct sk_buff *skb, const struct xt_secmark_target_info_v1 *info)
 {
        u32 secmark = 0;
-       const struct xt_secmark_target_info *info = par->targinfo;
 
        switch (mode) {
        case SECMARK_MODE_SEL:
@@ -41,7 +40,7 @@ secmark_tg(struct sk_buff *skb, const struct xt_action_param *par)
        return XT_CONTINUE;
 }
 
-static int checkentry_lsm(struct xt_secmark_target_info *info)
+static int checkentry_lsm(struct xt_secmark_target_info_v1 *info)
 {
        int err;
 
@@ -73,15 +72,15 @@ static int checkentry_lsm(struct xt_secmark_target_info *info)
        return 0;
 }
 
-static int secmark_tg_check(const struct xt_tgchk_param *par)
+static int
+secmark_tg_check(const char *table, struct xt_secmark_target_info_v1 *info)
 {
-       struct xt_secmark_target_info *info = par->targinfo;
        int err;
 
-       if (strcmp(par->table, "mangle") != 0 &&
-           strcmp(par->table, "security") != 0) {
+       if (strcmp(table, "mangle") != 0 &&
+           strcmp(table, "security") != 0) {
                pr_info_ratelimited("only valid in \'mangle\' or \'security\' table, not \'%s\'\n",
-                                   par->table);
+                                   table);
                return -EINVAL;
        }
 
@@ -116,25 +115,76 @@ static void secmark_tg_destroy(const struct xt_tgdtor_param *par)
        }
 }
 
-static struct xt_target secmark_tg_reg __read_mostly = {
-       .name       = "SECMARK",
-       .revision   = 0,
-       .family     = NFPROTO_UNSPEC,
-       .checkentry = secmark_tg_check,
-       .destroy    = secmark_tg_destroy,
-       .target     = secmark_tg,
-       .targetsize = sizeof(struct xt_secmark_target_info),
-       .me         = THIS_MODULE,
+static int secmark_tg_check_v0(const struct xt_tgchk_param *par)
+{
+       struct xt_secmark_target_info *info = par->targinfo;
+       struct xt_secmark_target_info_v1 newinfo = {
+               .mode   = info->mode,
+       };
+       int ret;
+
+       memcpy(newinfo.secctx, info->secctx, SECMARK_SECCTX_MAX);
+
+       ret = secmark_tg_check(par->table, &newinfo);
+       info->secid = newinfo.secid;
+
+       return ret;
+}
+
+static unsigned int
+secmark_tg_v0(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       const struct xt_secmark_target_info *info = par->targinfo;
+       struct xt_secmark_target_info_v1 newinfo = {
+               .secid  = info->secid,
+       };
+
+       return secmark_tg(skb, &newinfo);
+}
+
+static int secmark_tg_check_v1(const struct xt_tgchk_param *par)
+{
+       return secmark_tg_check(par->table, par->targinfo);
+}
+
+static unsigned int
+secmark_tg_v1(struct sk_buff *skb, const struct xt_action_param *par)
+{
+       return secmark_tg(skb, par->targinfo);
+}
+
+static struct xt_target secmark_tg_reg[] __read_mostly = {
+       {
+               .name           = "SECMARK",
+               .revision       = 0,
+               .family         = NFPROTO_UNSPEC,
+               .checkentry     = secmark_tg_check_v0,
+               .destroy        = secmark_tg_destroy,
+               .target         = secmark_tg_v0,
+               .targetsize     = sizeof(struct xt_secmark_target_info),
+               .me             = THIS_MODULE,
+       },
+       {
+               .name           = "SECMARK",
+               .revision       = 1,
+               .family         = NFPROTO_UNSPEC,
+               .checkentry     = secmark_tg_check_v1,
+               .destroy        = secmark_tg_destroy,
+               .target         = secmark_tg_v1,
+               .targetsize     = sizeof(struct xt_secmark_target_info_v1),
+               .usersize       = offsetof(struct xt_secmark_target_info_v1, secid),
+               .me             = THIS_MODULE,
+       },
 };
 
 static int __init secmark_tg_init(void)
 {
-       return xt_register_target(&secmark_tg_reg);
+       return xt_register_targets(secmark_tg_reg, ARRAY_SIZE(secmark_tg_reg));
 }
 
 static void __exit secmark_tg_exit(void)
 {
-       xt_unregister_target(&secmark_tg_reg);
+       xt_unregister_targets(secmark_tg_reg, ARRAY_SIZE(secmark_tg_reg));
 }
 
 module_init(secmark_tg_init);