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netfilter: nf_tables: dump sets in all existing families

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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@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2013-12-26 16:49:03 +01:00
parent 720e0dfa3a
commit c9c8e48597
1 changed files with 78 additions and 9 deletions
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87
net/netfilter/nf_tables_api.c
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@ -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);