In order to support anonymous sets, cache them along with their
elements.
Signed-off-by: Phil Sutter <p...@nwl.cc>
---
Changes since v1:
- Fix cache flushing: Since set fetching happens only if rules are
fetched, too, set list may be NULL so call nftnl_set_list_free() and
nftnl_set_list_foreach() conditionally.
- Support fetching only a specific set from kernel. Make sure no
duplicate element fetches happen by checking set element count. (If
non-zero, don't fetch elements.)
- When fetching rules for a single chain, fetch only that table's sets.
---
iptables/nft.c | 208 +++++++++++++++++++++++++++++++++++++++++++++++--
iptables/nft.h | 8 ++
2 files changed, 211 insertions(+), 5 deletions(-)
diff --git a/iptables/nft.c b/iptables/nft.c
index 6977b8946d08f..f46f13c2501e2 100644
--- a/iptables/nft.c
+++ b/iptables/nft.c
@@ -874,6 +874,14 @@ static int __flush_chain_cache(struct nftnl_chain *c, void
*data)
return 0;
}
+static int __flush_set_cache(struct nftnl_set *s, void *data)
+{
+ nftnl_set_list_del(s);
+ nftnl_set_free(s);
+
+ return 0;
+}
+
static int flush_cache(struct nft_cache *c, const struct builtin_table *tables,
const char *tablename)
{
@@ -882,10 +890,14 @@ static int flush_cache(struct nft_cache *c, const struct
builtin_table *tables,
if (tablename) {
table = __nft_table_builtin_find(tables, tablename);
- if (!table || !c->table[table->type].chains)
+ if (!table)
return 0;
- nftnl_chain_list_foreach(c->table[table->type].chains,
- __flush_chain_cache, NULL);
+ if (c->table[table->type].chains)
+ nftnl_chain_list_foreach(c->table[table->type].chains,
+ __flush_chain_cache, NULL);
+ if (c->table[table->type].sets)
+ nftnl_set_list_foreach(c->table[table->type].sets,
+ __flush_set_cache, NULL);
return 0;
}
@@ -898,6 +910,9 @@ static int flush_cache(struct nft_cache *c, const struct
builtin_table *tables,
nftnl_chain_list_free(c->table[i].chains);
c->table[i].chains = NULL;
+ if (c->table[i].sets)
+ nftnl_set_list_free(c->table[i].sets);
+ c->table[i].sets = NULL;
}
nftnl_table_list_free(c->tables);
c->tables = NULL;
@@ -1457,6 +1472,159 @@ static int fetch_table_cache(struct nft_handle *h)
return 1;
}
+struct nftnl_set_list_cb_data {
+ struct nft_handle *h;
+ const struct builtin_table *t;
+};
+
+static int nftnl_set_list_cb(const struct nlmsghdr *nlh, void *data)
+{
+ struct nftnl_set_list_cb_data *d = data;
+ const struct builtin_table *t = d->t;
+ struct nftnl_set_list *list;
+ struct nft_handle *h = d->h;
+ const char *tname, *sname;
+ struct nftnl_set *s;
+
+ s = nftnl_set_alloc();
+ if (s == NULL)
+ return MNL_CB_OK;
+
+ if (nftnl_set_nlmsg_parse(nlh, s) < 0)
+ goto out_free;
+
+ tname = nftnl_set_get_str(s, NFTNL_SET_TABLE);
+
+ if (!t)
+ t = nft_table_builtin_find(h, tname);
+ else if (strcmp(t->name, tname))
+ goto out_free;
+
+ if (!t)
+ goto out_free;
+
+ list = h->cache->table[t->type].sets;
+ sname = nftnl_set_get_str(s, NFTNL_SET_NAME);
+
+ if (nftnl_set_list_lookup_byname(list, sname))
+ goto out_free;
+
+ nftnl_set_list_add_tail(s, list);
+
+ return MNL_CB_OK;
+out_free:
+ nftnl_set_free(s);
+ return MNL_CB_OK;
+}
+
+static int set_elem_cb(const struct nlmsghdr *nlh, void *data)
+{
+ return nftnl_set_elems_nlmsg_parse(nlh, data) ? -1 : MNL_CB_OK;
+}
+
+static bool set_has_elements(struct nftnl_set *s)
+{
+ struct nftnl_set_elems_iter *iter;
+ bool ret = false;
+
+ iter = nftnl_set_elems_iter_create(s);
+ if (iter) {
+ ret = !!nftnl_set_elems_iter_cur(iter);
+ nftnl_set_elems_iter_destroy(iter);
+ }
+ return ret;
+}
+
+static int set_fetch_elem_cb(struct nftnl_set *s, void *data)
+{
+ char buf[MNL_SOCKET_BUFFER_SIZE];
+ struct nft_handle *h = data;
+ struct nlmsghdr *nlh;
+
+ if (set_has_elements(s))
+ return 0;
+
+ nlh = nftnl_nlmsg_build_hdr(buf, NFT_MSG_GETSETELEM, h->family,
+ NLM_F_DUMP, h->seq);
+ nftnl_set_elems_nlmsg_build_payload(nlh, s);
+
+ return mnl_talk(h, nlh, set_elem_cb, s);
+}
+
+static int fetch_set_cache(struct nft_handle *h,
+ const struct builtin_table *t, const char *set)
+{
+ struct nftnl_set_list_cb_data d = {
+ .h = h,
+ .t = t,
+ };
+ struct nlmsghdr *nlh;
+ char buf[16536];
+ int i, ret;
+
+ if (!t) {
+ fetch_table_cache(h);
+
+ for (i = 0; i < NFT_TABLE_MAX; i++) {
+ enum nft_table_type type = h->tables[i].type;
+
+ if (!h->tables[i].name)
+ continue;
+
+ h->cache->table[type].sets = nftnl_set_list_alloc();
+ if (!h->cache->table[type].sets)
+ return -1;
+ }
+ } else if (!h->cache->table[t->type].sets) {
+ h->cache->table[t->type].sets = nftnl_set_list_alloc();
+ }
+
+ if (t && set) {
+ struct nftnl_set *s = nftnl_set_alloc();
+
+ if (!s)
+ return -1;
+
+ nlh = nftnl_set_nlmsg_build_hdr(buf, NFT_MSG_GETSET, h->family,
+ NLM_F_ACK, h->seq);
+ nftnl_set_set_str(s, NFTNL_SET_TABLE, t->name);
+ nftnl_set_set_str(s, NFTNL_SET_NAME, set);
+ nftnl_set_nlmsg_build_payload(nlh, s);
+ nftnl_set_free(s);
+ } else {
+ nlh = nftnl_set_nlmsg_build_hdr(buf, NFT_MSG_GETSET, h->family,
+ NLM_F_DUMP, h->seq);
+ }
+
+ ret = mnl_talk(h, nlh, nftnl_set_list_cb, &d);
+ if (ret < 0 && errno == EINTR) {
+ assert(nft_restart(h) >= 0);
+ return ret;
+ }
+
+ if (t && set) {
+ struct nftnl_set *s;
+
+ s = nftnl_set_list_lookup_byname(h->cache->table[t->type].sets,
+ set);
+ set_fetch_elem_cb(s, h);
+ } else if (t) {
+ nftnl_set_list_foreach(h->cache->table[t->type].sets,
+ set_fetch_elem_cb, h);
+ } else {
+ for (i = 0; i < NFT_TABLE_MAX; i++) {
+ enum nft_table_type type = h->tables[i].type;
+
+ if (!h->tables[i].name)
+ continue;
+
+ nftnl_set_list_foreach(h->cache->table[type].sets,
+ set_fetch_elem_cb, h);
+ }
+ }
+ return ret;
+}
+
static int fetch_chain_cache(struct nft_handle *h,
const struct builtin_table *t, const char *chain)
{
@@ -1651,15 +1819,29 @@ static int fetch_rule_cache(struct nft_handle *h,
struct nftnl_chain *c)
if (h->have_cache)
return 0;
- if (c)
- return nft_rule_list_update(c, h);
+ if (c) {
+ const struct builtin_table *t;
+ const char *tname;
+
+ tname = nftnl_chain_get_str(c, NFTNL_CHAIN_TABLE);
+ t = nft_table_builtin_find(h, tname);
+ if (!t)
+ return -1;
+ if (fetch_set_cache(h, t, NULL))
+ return -1;
+
+ return nft_rule_list_update(c, h);
+ }
for (i = 0; i < NFT_TABLE_MAX; i++) {
enum nft_table_type type = h->tables[i].type;
if (!h->tables[i].name)
continue;
+ if (fetch_set_cache(h, &h->tables[i], NULL))
+ return -1;
+
if (nftnl_chain_list_foreach(h->cache->table[type].chains,
nft_rule_list_update, h))
return -1;
@@ -1749,6 +1931,22 @@ struct nftnl_chain_list *nft_chain_list_get(struct
nft_handle *h,
return h->cache->table[t->type].chains;
}
+struct nftnl_set_list *nft_set_list_get(struct nft_handle *h,
+ const char *table,
+ const char *set)
+{
+ const struct builtin_table *t;
+
+ t = nft_table_builtin_find(h, table);
+ if (!t)
+ return NULL;
+
+ if (!h->have_cache)
+ fetch_set_cache(h, t, set);
+
+ return h->cache->table[t->type].sets;
+}
+
static const char *policy_name[NF_ACCEPT+1] = {
[NF_DROP] = "DROP",
[NF_ACCEPT] = "ACCEPT",
diff --git a/iptables/nft.h b/iptables/nft.h
index bb88f0b796f02..bfee7ba727eaa 100644
--- a/iptables/nft.h
+++ b/iptables/nft.h
@@ -31,6 +31,7 @@ struct nft_cache {
struct nftnl_table_list *tables;
struct {
struct nftnl_chain_list *chains;
+ struct nftnl_set_list *sets;
bool initialized;
} table[NFT_TABLE_MAX];
};
@@ -89,6 +90,13 @@ int nft_table_flush(struct nft_handle *h, const char *table);
void nft_table_new(struct nft_handle *h, const char *table);
const struct builtin_table *nft_table_builtin_find(struct nft_handle *h, const
char *table);
+/*
+ * Operations with sets.
+ */
+struct nftnl_set_list *nft_set_list_get(struct nft_handle *h,
+ const char *table,
+ const char *set);
+
/*
* Operations with chains.
*/
--
2.23.0
