This patch adds set_elems notifications. When a set_elem is
added/deleted, all listening peers in userspace will receive the
corresponding notification.
Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@xxxxxxxxx>
Acked-by: Patrick McHardy <kaber@xxxxxxxxx>
Signed-off-by: Pablo Neira Ayuso <pablo@xxxxxxxxxxxx>
---
v2: rebased and fixed by Pablo. Tested again by myself.
net/netfilter/nf_tables_api.c | 82 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 82 insertions(+)
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index bd3381e..60feca9 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2807,6 +2807,85 @@ static int nf_tables_getsetelem(struct sock *nlsk, struct sk_buff *skb,
return -EOPNOTSUPP;
}
+static int nf_tables_fill_setelem_info(struct sk_buff *skb,
+ const struct nft_ctx *ctx, u32 seq,
+ u32 portid, int event, u16 flags,
+ const struct nft_set *set,
+ const struct nft_set_elem *elem)
+{
+ struct nfgenmsg *nfmsg;
+ struct nlmsghdr *nlh;
+ struct nlattr *nest;
+ int err;
+
+ event |= NFNL_SUBSYS_NFTABLES << 8;
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(struct nfgenmsg),
+ flags);
+ if (nlh == NULL)
+ goto nla_put_failure;
+
+ nfmsg = nlmsg_data(nlh);
+ nfmsg->nfgen_family = ctx->afi->family;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = 0;
+
+ if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
+ goto nla_put_failure;
+ if (nla_put_string(skb, NFTA_SET_NAME, set->name))
+ goto nla_put_failure;
+
+ nest = nla_nest_start(skb, NFTA_SET_ELEM_LIST_ELEMENTS);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ err = nf_tables_fill_setelem(skb, set, elem);
+ if (err < 0)
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+
+ return nlmsg_end(skb, nlh);
+
+nla_put_failure:
+ nlmsg_trim(skb, nlh);
+ return -1;
+}
+
+static int nf_tables_setelem_notify(const struct nft_ctx *ctx,
+ const struct nft_set *set,
+ const struct nft_set_elem *elem,
+ int event, u16 flags)
+{
+ const struct sk_buff *oskb = ctx->skb;
+ struct net *net = sock_net(oskb->sk);
+ u32 portid = NETLINK_CB(oskb).portid;
+ bool report = nlmsg_report(ctx->nlh);
+ struct sk_buff *skb;
+ int err;
+
+ if (!report && !nfnetlink_has_listeners(net, NFNLGRP_NFTABLES))
+ return 0;
+
+ err = -ENOBUFS;
+ skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (skb == NULL)
+ goto err;
+
+ err = nf_tables_fill_setelem_info(skb, ctx, 0, portid, event, flags,
+ set, elem);
+ if (err < 0) {
+ kfree_skb(skb);
+ goto err;
+ }
+
+ err = nfnetlink_send(skb, net, portid, NFNLGRP_NFTABLES, report,
+ GFP_KERNEL);
+err:
+ if (err < 0)
+ nfnetlink_set_err(net, portid, NFNLGRP_NFTABLES, err);
+ return err;
+}
+
static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set,
const struct nlattr *attr)
{
@@ -2887,6 +2966,7 @@ static int nft_add_set_elem(const struct nft_ctx *ctx, struct nft_set *set,
goto err3;
set->nelems++;
+ nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_NEWSETELEM, 0);
return 0;
err3:
@@ -2957,6 +3037,8 @@ static int nft_del_setelem(const struct nft_ctx *ctx, struct nft_set *set,
set->ops->remove(set, &elem);
set->nelems--;
+ nf_tables_setelem_notify(ctx, set, &elem, NFT_MSG_DELSETELEM, 0);
+
nft_data_uninit(&elem.key, NFT_DATA_VALUE);
if (set->flags & NFT_SET_MAP)
nft_data_uninit(&elem.data, set->dtype);
--
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