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netfilter: nf_tables: Introduce nf_tables_getobj_single

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Outsource the reply skb preparation for non-dump getrule requests into a
distinct function. Prep work for object reset locking.

Signed-off-by: Phil Sutter <phil@nwl.cc>
Reviewed-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Phil Sutter 2024-08-09 15:07:31 +02:00 committed by Pablo Neira Ayuso
parent e0b6648b04
commit 69fc3e9e90
1 changed files with 49 additions and 36 deletions
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85
net/netfilter/nf_tables_api.c
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@ -8052,10 +8052,10 @@ static int nf_tables_dump_obj_done(struct netlink_callback *cb)
}
/* called with rcu_read_lock held */
static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
static struct sk_buff *
nf_tables_getobj_single(u32 portid, const struct nfnl_info *info,
const struct nlattr * const nla[], bool reset)
{
const struct nftables_pernet *nft_net = nft_pernet(info->net);
struct netlink_ext_ack *extack = info->extack;
u8 genmask = nft_genmask_cur(info->net);
u8 family = info->nfmsg->nfgen_family;
@ -8063,11 +8063,51 @@ static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
struct net *net = info->net;
struct nft_object *obj;
struct sk_buff *skb2;
bool reset = false;
u32 objtype;
char *buf;
int err;
if (!nla[NFTA_OBJ_NAME] ||
!nla[NFTA_OBJ_TYPE])
return ERR_PTR(-EINVAL);
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return ERR_CAST(table);
}
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
if (IS_ERR(obj)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
return ERR_CAST(obj);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
return ERR_PTR(-ENOMEM);
err = nf_tables_fill_obj_info(skb2, net, portid,
info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
family, table, obj, reset);
if (err < 0) {
kfree_skb(skb2);
return ERR_PTR(err);
}
return skb2;
}
static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
const struct nlattr * const nla[])
{
struct nftables_pernet *nft_net = nft_pernet(info->net);
u32 portid = NETLINK_CB(skb).portid;
struct net *net = info->net;
struct sk_buff *skb2;
bool reset = false;
char *buf;
if (info->nlh->nlmsg_flags & NLM_F_DUMP) {
struct netlink_dump_control c = {
.start = nf_tables_dump_obj_start,
@ -8080,35 +8120,12 @@ static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
return nft_netlink_dump_start_rcu(info->sk, skb, info->nlh, &c);
}
if (!nla[NFTA_OBJ_NAME] ||
!nla[NFTA_OBJ_TYPE])
return -EINVAL;
table = nft_table_lookup(net, nla[NFTA_OBJ_TABLE], family, genmask, 0);
if (IS_ERR(table)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_TABLE]);
return PTR_ERR(table);
}
objtype = ntohl(nla_get_be32(nla[NFTA_OBJ_TYPE]));
obj = nft_obj_lookup(net, table, nla[NFTA_OBJ_NAME], objtype, genmask);
if (IS_ERR(obj)) {
NL_SET_BAD_ATTR(extack, nla[NFTA_OBJ_NAME]);
return PTR_ERR(obj);
}
skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
if (!skb2)
return -ENOMEM;
if (NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_GETOBJ_RESET)
reset = true;
err = nf_tables_fill_obj_info(skb2, net, NETLINK_CB(skb).portid,
info->nlh->nlmsg_seq, NFT_MSG_NEWOBJ, 0,
family, table, obj, reset);
if (err < 0)
goto err_fill_obj_info;
skb2 = nf_tables_getobj_single(portid, info, nla, reset);
if (IS_ERR(skb2))
return PTR_ERR(skb2);
if (!reset)
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
@ -8121,11 +8138,7 @@ static int nf_tables_getobj(struct sk_buff *skb, const struct nfnl_info *info,
AUDIT_NFT_OP_OBJ_RESET, GFP_ATOMIC);
kfree(buf);
return nfnetlink_unicast(skb2, net, NETLINK_CB(skb).portid);
err_fill_obj_info:
kfree_skb(skb2);
return err;
return nfnetlink_unicast(skb2, net, portid);
}
static void nft_obj_destroy(const struct nft_ctx *ctx, struct nft_object *obj)