[nf PATCH 1/2] netfilter: nf_tables: Audit log setelem reset
Since set element reset is not integrated into nf_tables' transaction
logic, an explicit log call is needed, similar to NFT_MSG_GETOBJ_RESET
handling.
For the sake of simplicity, catchall element reset will always generate
a dedicated log entry. This relieves nf_tables_dump_set() from having to
adjust the logged element count depending on whether a catchall element
was found or not.
Cc: Richard Guy Briggs <rgb(a)redhat.com>
Fixes: 079cd633219d7 ("netfilter: nf_tables: Introduce
NFT_MSG_GETSETELEM_RESET")
Signed-off-by: Phil Sutter <phil(a)nwl.cc>
---
include/linux/audit.h | 1 +
kernel/auditsc.c | 1 +
net/netfilter/nf_tables_api.c | 31 ++++++++++++++++++++++++++++---
3 files changed, 30 insertions(+), 3 deletions(-)
diff --git a/include/linux/audit.h b/include/linux/audit.h
index 6a3a9e122bb5e..192bf03aacc52 100644
--- a/include/linux/audit.h
+++ b/include/linux/audit.h
@@ -117,6 +117,7 @@ enum audit_nfcfgop {
AUDIT_NFT_OP_OBJ_RESET,
AUDIT_NFT_OP_FLOWTABLE_REGISTER,
AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
+ AUDIT_NFT_OP_SETELEM_RESET,
AUDIT_NFT_OP_INVALID,
};
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index addeed3df15d3..38481e3181975 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -143,6 +143,7 @@ static const struct audit_nfcfgop_tab audit_nfcfgs[] = {
{ AUDIT_NFT_OP_OBJ_RESET, "nft_reset_obj" },
{ AUDIT_NFT_OP_FLOWTABLE_REGISTER, "nft_register_flowtable" },
{ AUDIT_NFT_OP_FLOWTABLE_UNREGISTER, "nft_unregister_flowtable" },
+ { AUDIT_NFT_OP_SETELEM_RESET, "nft_reset_setelem" },
{ AUDIT_NFT_OP_INVALID, "nft_invalid" },
};
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 1ddbdca4e47d6..a1218ea4e0c3d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -102,6 +102,7 @@ static const u8 nft2audit_op[NFT_MSG_MAX] = { // enum
nf_tables_msg_types
[NFT_MSG_NEWFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_REGISTER,
[NFT_MSG_GETFLOWTABLE] = AUDIT_NFT_OP_INVALID,
[NFT_MSG_DELFLOWTABLE] = AUDIT_NFT_OP_FLOWTABLE_UNREGISTER,
+ [NFT_MSG_GETSETELEM_RESET] = AUDIT_NFT_OP_SETELEM_RESET,
};
static void nft_validate_state_update(struct nft_table *table, u8 new_validate_state)
@@ -5661,13 +5662,25 @@ static int nf_tables_dump_setelem(const struct nft_ctx *ctx,
return nf_tables_fill_setelem(args->skb, set, elem, args->reset);
}
+static void audit_log_nft_set_reset(const struct nft_table *table,
+ unsigned int base_seq,
+ unsigned int nentries)
+{
+ char *buf = kasprintf(GFP_ATOMIC, "%s:%u", table->name, base_seq);
+
+ audit_log_nfcfg(buf, table->family, nentries,
+ AUDIT_NFT_OP_SETELEM_RESET, GFP_ATOMIC);
+ kfree(buf);
+}
+
struct nft_set_dump_ctx {
const struct nft_set *set;
struct nft_ctx ctx;
};
static int nft_set_catchall_dump(struct net *net, struct sk_buff *skb,
- const struct nft_set *set, bool reset)
+ const struct nft_set *set, bool reset,
+ unsigned int base_seq)
{
struct nft_set_elem_catchall *catchall;
u8 genmask = nft_genmask_cur(net);
@@ -5683,6 +5696,8 @@ static int nft_set_catchall_dump(struct net *net, struct sk_buff
*skb,
elem.priv = catchall->elem;
ret = nf_tables_fill_setelem(skb, set, &elem, reset);
+ if (reset && !ret)
+ audit_log_nft_set_reset(set->table, base_seq, 1);
break;
}
@@ -5762,12 +5777,17 @@ static int nf_tables_dump_set(struct sk_buff *skb, struct
netlink_callback *cb)
set->ops->walk(&dump_ctx->ctx, set, &args.iter);
if (!args.iter.err && args.iter.count == cb->args[0])
- args.iter.err = nft_set_catchall_dump(net, skb, set, reset);
+ args.iter.err = nft_set_catchall_dump(net, skb, set,
+ reset, cb->seq);
rcu_read_unlock();
nla_nest_end(skb, nest);
nlmsg_end(skb, nlh);
+ if (reset && args.iter.count > args.iter.skip)
+ audit_log_nft_set_reset(table, cb->seq,
+ args.iter.count - args.iter.skip);
+
if (args.iter.err && args.iter.err != -EMSGSIZE)
return args.iter.err;
if (args.iter.count == cb->args[0])
@@ -5992,13 +6012,13 @@ static int nf_tables_getsetelem(struct sk_buff *skb,
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
+ int rem, err = 0, nelems = 0;
struct net *net = info->net;
struct nft_table *table;
struct nft_set *set;
struct nlattr *attr;
struct nft_ctx ctx;
bool reset = false;
- int rem, err = 0;
table = nft_table_lookup(net, nla[NFTA_SET_ELEM_LIST_TABLE], family,
genmask, 0);
@@ -6041,8 +6061,13 @@ static int nf_tables_getsetelem(struct sk_buff *skb,
NL_SET_BAD_ATTR(extack, attr);
break;
}
+ nelems++;
}
+ if (reset)
+ audit_log_nft_set_reset(table, nft_pernet(net)->base_seq,
+ nelems);
+
return err;
}
--
2.41.0