This patch allows you to dump all sets available in all of
the registered families. This allows you to use NFPROTO_UNSPEC
to dump all existing sets, similarly to other existing table,
chain and rule operations.
This patch is based on original patch from Arturo Borrero
González.
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxxx>
---
net/netfilter/nf_tables_api.c | 87 ++++++++++++++++++++++++++++++++++++-----
1 file changed, 78 insertions(+), 9 deletions(-)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 37f0e69..0d4b42d 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -1904,12 +1904,14 @@ static int nft_ctx_init_from_setattr(struct nft_ctx *ctx,
{
struct net *net = sock_net(skb->sk);
const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- const struct nft_af_info *afi;
+ const struct nft_af_info *afi = NULL;
const struct nft_table *table = NULL;
- afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
- if (IS_ERR(afi))
- return PTR_ERR(afi);
+ if (nfmsg->nfgen_family != NFPROTO_UNSPEC) {
+ afi = nf_tables_afinfo_lookup(net, nfmsg->nfgen_family, false);
+ if (IS_ERR(afi))
+ return PTR_ERR(afi);
+ }
if (nla[NFTA_SET_TABLE] != NULL) {
table = nf_tables_table_lookup(afi, nla[NFTA_SET_TABLE]);
@@ -2078,8 +2080,8 @@ done:
return skb->len;
}
-static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
- struct netlink_callback *cb)
+static int nf_tables_dump_sets_family(struct nft_ctx *ctx, struct sk_buff *skb,
+ struct netlink_callback *cb)
{
const struct nft_set *set;
unsigned int idx = 0, s_idx = cb->args[0];
@@ -2111,6 +2113,61 @@ done:
return skb->len;
}
+static int nf_tables_dump_sets_all(struct nft_ctx *ctx, struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ const struct nft_set *set;
+ unsigned int idx, s_idx = cb->args[0];
+ const struct nft_af_info *afi;
+ struct nft_table *table, *cur_table = (struct nft_table *)cb->args[2];
+ struct net *net = sock_net(skb->sk);
+ int cur_family = cb->args[3];
+
+ if (cb->args[1])
+ return skb->len;
+
+ list_for_each_entry(afi, &net->nft.af_info, list) {
+ if (cur_family) {
+ if (afi->family != cur_family)
+ continue;
+
+ cur_family = 0;
+ }
+
+ list_for_each_entry(table, &afi->tables, list) {
+ if (cur_table) {
+ if (cur_table != table)
+ continue;
+
+ cur_table = NULL;
+ }
+
+ ctx->table = table;
+ ctx->afi = afi;
+ idx = 0;
+ list_for_each_entry(set, &ctx->table->sets, list) {
+ if (idx < s_idx)
+ goto cont;
+ if (nf_tables_fill_set(skb, ctx, set,
+ NFT_MSG_NEWSET,
+ NLM_F_MULTI) < 0) {
+ cb->args[0] = idx;
+ cb->args[2] = (unsigned long) table;
+ cb->args[3] = afi->family;
+ goto done;
+ }
+cont:
+ idx++;
+ }
+ if (s_idx)
+ s_idx = 0;
+ }
+ }
+ cb->args[1] = 1;
+done:
+ return skb->len;
+}
+
static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
@@ -2127,9 +2184,12 @@ static int nf_tables_dump_sets(struct sk_buff *skb, struct netlink_callback *cb)
if (err < 0)
return err;
- if (ctx.table == NULL)
- ret = nf_tables_dump_sets_all(&ctx, skb, cb);
- else
+ if (ctx.table == NULL) {
+ if (ctx.afi == NULL)
+ ret = nf_tables_dump_sets_all(&ctx, skb, cb);
+ else
+ ret = nf_tables_dump_sets_family(&ctx, skb, cb);
+ } else
ret = nf_tables_dump_sets_table(&ctx, skb, cb);
return ret;
@@ -2142,6 +2202,7 @@ static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
const struct nft_set *set;
struct nft_ctx ctx;
struct sk_buff *skb2;
+ const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
int err;
/* Verify existance before starting dump */
@@ -2156,6 +2217,10 @@ static int nf_tables_getset(struct sock *nlsk, struct sk_buff *skb,
return netlink_dump_start(nlsk, skb, nlh, &c);
}
+ /* Only accept unspec with dump */
+ if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
+ return -EAFNOSUPPORT;
+
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
if (IS_ERR(set))
return PTR_ERR(set);
@@ -2325,6 +2390,7 @@ static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
{
+ const struct nfgenmsg *nfmsg = nlmsg_data(nlh);
struct nft_set *set;
struct nft_ctx ctx;
int err;
@@ -2336,6 +2402,9 @@ static int nf_tables_delset(struct sock *nlsk, struct sk_buff *skb,
if (err < 0)
return err;
+ if (nfmsg->nfgen_family == NFPROTO_UNSPEC)
+ return -EAFNOSUPPORT;
+
set = nf_tables_set_lookup(ctx.table, nla[NFTA_SET_NAME]);
if (IS_ERR(set))
return PTR_ERR(set);
--
1.7.10.4
--
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