@@ -326,13 +326,15 @@ static inline void *nft_expr_priv(const struct nft_expr *expr)
* @handle: rule handle
* @genmask: generation mask
* @dlen: length of expression data
+ * @ulen: length of user data (used for comments)
* @data: expression data
*/
struct nft_rule {
struct list_head list;
- u64 handle:46,
+ u64 handle:42,
genmask:2,
- dlen:16;
+ dlen:12,
+ ulen:8;
unsigned char data[]
__attribute__((aligned(__alignof__(struct nft_expr))));
};
@@ -371,6 +373,11 @@ static inline struct nft_expr *nft_expr_last(const struct nft_rule *rule)
return (struct nft_expr *)&rule->data[rule->dlen];
}
+static inline void *nft_userdata(const struct nft_rule *rule)
+{
+ return (void *)&rule->data[rule->dlen];
+}
+
/*
* The last pointer isn't really necessary, but the compiler isn't able to
* determine that the result of nft_expr_last() is always the same since it
@@ -1,7 +1,8 @@
#ifndef _LINUX_NF_TABLES_H
#define _LINUX_NF_TABLES_H
-#define NFT_CHAIN_MAXNAMELEN 32
+#define NFT_CHAIN_MAXNAMELEN 32
+#define NFT_USERDATA_MAXLEN 256
enum nft_registers {
NFT_REG_VERDICT,
@@ -156,6 +157,7 @@ enum nft_chain_attributes {
* @NFTA_RULE_EXPRESSIONS: list of expressions (NLA_NESTED: nft_expr_attributes)
* @NFTA_RULE_COMPAT: compatibility specifications of the rule (NLA_NESTED: nft_rule_compat_attributes)
* @NFTA_RULE_POSITION: numeric handle of the previous rule (NLA_U64)
+ * @NFTA_RULE_USERDATA: user data (NLA_BINARY, NFT_USERDATA_MAXLEN)
*/
enum nft_rule_attributes {
NFTA_RULE_UNSPEC,
@@ -165,6 +167,7 @@ enum nft_rule_attributes {
NFTA_RULE_EXPRESSIONS,
NFTA_RULE_COMPAT,
NFTA_RULE_POSITION,
+ NFTA_RULE_USERDATA,
__NFTA_RULE_MAX
};
#define NFTA_RULE_MAX (__NFTA_RULE_MAX - 1)
@@ -1295,6 +1295,8 @@ static const struct nla_policy nft_rule_policy[NFTA_RULE_MAX + 1] = {
[NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
[NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
[NFTA_RULE_POSITION] = { .type = NLA_U64 },
+ [NFTA_RULE_USERDATA] = { .type = NLA_BINARY,
+ .len = NFT_USERDATA_MAXLEN },
};
static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
@@ -1347,6 +1349,10 @@ static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
}
nla_nest_end(skb, list);
+ if (rule->ulen &&
+ nla_put(skb, NFTA_RULE_USERDATA, rule->ulen, nft_userdata(rule)))
+ goto nla_put_failure;
+
return nlmsg_end(skb, nlh);
nla_put_failure:
@@ -1583,7 +1589,7 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
struct nft_expr *expr;
struct nft_ctx ctx;
struct nlattr *tmp;
- unsigned int size, i, n;
+ unsigned int size, i, n, ulen = 0;
int err, rem;
bool create;
u64 handle, pos_handle;
@@ -1649,8 +1655,11 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
}
}
+ if (nla[NFTA_RULE_USERDATA])
+ ulen = nla_len(nla[NFTA_RULE_USERDATA]);
+
err = -ENOMEM;
- rule = kzalloc(sizeof(*rule) + size, GFP_KERNEL);
+ rule = kzalloc(sizeof(*rule) + size + ulen, GFP_KERNEL);
if (rule == NULL)
goto err1;
@@ -1658,6 +1667,10 @@ static int nf_tables_newrule(struct sock *nlsk, struct sk_buff *skb,
rule->handle = handle;
rule->dlen = size;
+ rule->ulen = ulen;
+
+ if (ulen)
+ nla_memcpy(nft_userdata(rule), nla[NFTA_RULE_USERDATA], ulen);
expr = nft_expr_first(rule);
for (i = 0; i < n; i++) {
This allows us to store user comment strings, but it could be also used to store any kind of information that the user application needs to link to the rule. Scratch 8 bits for the new ulen field that indicates the length the user data area. 4 bits from the handle (so it's 42 bits long, according to Patrick, it would last 139 years with 1000 new rules per second) and 4 bits from dlen (so the expression data area is 4K, which seems sufficient by now even considering the compatibility layer). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> --- include/net/netfilter/nf_tables.h | 11 +++++++++-- include/uapi/linux/netfilter/nf_tables.h | 5 ++++- net/netfilter/nf_tables_api.c | 17 +++++++++++++++-- 3 files changed, 28 insertions(+), 5 deletions(-)