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-rw-r--r--net/netfilter/Kconfig6
-rw-r--r--net/netfilter/Makefile1
-rw-r--r--net/netfilter/nf_tables_api.c46
-rw-r--r--net/netfilter/nf_tables_netdev.c183
4 files changed, 231 insertions, 5 deletions
diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
index 1c78d7fb1da7..fbc8d15c7fda 100644
--- a/net/netfilter/Kconfig
+++ b/net/netfilter/Kconfig
@@ -3,6 +3,7 @@ menu "Core Netfilter Configuration"
config NETFILTER_INGRESS
bool "Netfilter ingress support"
+ default y
select NET_INGRESS
help
This allows you to classify packets from ingress using the Netfilter
@@ -455,6 +456,11 @@ config NF_TABLES_INET
help
This option enables support for a mixed IPv4/IPv6 "inet" table.
+config NF_TABLES_NETDEV
+ tristate "Netfilter nf_tables netdev tables support"
+ help
+ This option enables support for the "netdev" table.
+
config NFT_EXTHDR
tristate "Netfilter nf_tables IPv6 exthdr module"
help
diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
index a87d8b8ec730..70d026d46fe7 100644
--- a/net/netfilter/Makefile
+++ b/net/netfilter/Makefile
@@ -75,6 +75,7 @@ nf_tables-objs += nft_bitwise.o nft_byteorder.o nft_payload.o
obj-$(CONFIG_NF_TABLES) += nf_tables.o
obj-$(CONFIG_NF_TABLES_INET) += nf_tables_inet.o
+obj-$(CONFIG_NF_TABLES_NETDEV) += nf_tables_netdev.o
obj-$(CONFIG_NFT_COMPAT) += nft_compat.o
obj-$(CONFIG_NFT_EXTHDR) += nft_exthdr.o
obj-$(CONFIG_NFT_META) += nft_meta.o
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 34ded09317e7..4528f122bcd2 100644
--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -399,6 +399,8 @@ static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
[NFTA_TABLE_NAME] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
[NFTA_TABLE_FLAGS] = { .type = NLA_U32 },
+ [NFTA_TABLE_DEV] = { .type = NLA_STRING,
+ .len = IFNAMSIZ - 1 },
};
static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
@@ -423,6 +425,10 @@ static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
nla_put_be32(skb, NFTA_TABLE_USE, htonl(table->use)))
goto nla_put_failure;
+ if (table->dev &&
+ nla_put_string(skb, NFTA_TABLE_DEV, table->dev->name))
+ goto nla_put_failure;
+
nlmsg_end(skb, nlh);
return 0;
@@ -608,6 +614,11 @@ static int nf_tables_updtable(struct nft_ctx *ctx)
if (flags == ctx->table->flags)
return 0;
+ if ((ctx->afi->flags & NFT_AF_NEEDS_DEV) &&
+ ctx->nla[NFTA_TABLE_DEV] &&
+ nla_strcmp(ctx->nla[NFTA_TABLE_DEV], ctx->table->dev->name))
+ return -EOPNOTSUPP;
+
trans = nft_trans_alloc(ctx, NFT_MSG_NEWTABLE,
sizeof(struct nft_trans_table));
if (trans == NULL)
@@ -645,6 +656,7 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
struct nft_table *table;
struct net *net = sock_net(skb->sk);
int family = nfmsg->nfgen_family;
+ struct net_device *dev = NULL;
u32 flags = 0;
struct nft_ctx ctx;
int err;
@@ -679,30 +691,50 @@ static int nf_tables_newtable(struct sock *nlsk, struct sk_buff *skb,
return -EINVAL;
}
+ if (afi->flags & NFT_AF_NEEDS_DEV) {
+ char ifname[IFNAMSIZ];
+
+ if (!nla[NFTA_TABLE_DEV])
+ return -EOPNOTSUPP;
+
+ nla_strlcpy(ifname, nla[NFTA_TABLE_DEV], IFNAMSIZ);
+ dev = dev_get_by_name(net, ifname);
+ if (!dev)
+ return -ENOENT;
+ } else if (nla[NFTA_TABLE_DEV]) {
+ return -EOPNOTSUPP;
+ }
+
+ err = -EAFNOSUPPORT;
if (!try_module_get(afi->owner))
- return -EAFNOSUPPORT;
+ goto err1;
err = -ENOMEM;
table = kzalloc(sizeof(*table), GFP_KERNEL);
if (table == NULL)
- goto err1;
+ goto err2;
nla_strlcpy(table->name, name, NFT_TABLE_MAXNAMELEN);
INIT_LIST_HEAD(&table->chains);
INIT_LIST_HEAD(&table->sets);
table->flags = flags;
+ table->dev = dev;
nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
err = nft_trans_table_add(&ctx, NFT_MSG_NEWTABLE);
if (err < 0)
- goto err2;
+ goto err3;
list_add_tail_rcu(&table->list, &afi->tables);
return 0;
-err2:
+err3:
kfree(table);
-err1:
+err2:
module_put(afi->owner);
+err1:
+ if (dev != NULL)
+ dev_put(dev);
+
return err;
}
@@ -806,6 +838,9 @@ static void nf_tables_table_destroy(struct nft_ctx *ctx)
{
BUG_ON(ctx->table->use > 0);
+ if (ctx->table->dev)
+ dev_put(ctx->table->dev);
+
kfree(ctx->table);
module_put(ctx->afi->owner);
}
@@ -1361,6 +1396,7 @@ static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
ops->priority = priority;
ops->priv = chain;
ops->hook = afi->hooks[ops->hooknum];
+ ops->dev = table->dev;
if (hookfn)
ops->hook = hookfn;
if (afi->hook_ops_init)
diff --git a/net/netfilter/nf_tables_netdev.c b/net/netfilter/nf_tables_netdev.c
new file mode 100644
index 000000000000..04cb17057f46
--- /dev/null
+++ b/net/netfilter/nf_tables_netdev.c
@@ -0,0 +1,183 @@
+/*
+ * Copyright (c) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <net/netfilter/nf_tables.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/netfilter/nf_tables_ipv4.h>
+#include <net/netfilter/nf_tables_ipv6.h>
+
+static inline void
+nft_netdev_set_pktinfo_ipv4(struct nft_pktinfo *pkt,
+ const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ struct iphdr *iph, _iph;
+ u32 len, thoff;
+
+ nft_set_pktinfo(pkt, ops, skb, state);
+
+ iph = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*iph),
+ &_iph);
+ if (!iph)
+ return;
+
+ iph = ip_hdr(skb);
+ if (iph->ihl < 5 || iph->version != 4)
+ return;
+
+ len = ntohs(iph->tot_len);
+ thoff = iph->ihl * 4;
+ if (skb->len < len)
+ return;
+ else if (len < thoff)
+ return;
+
+ pkt->tprot = iph->protocol;
+ pkt->xt.thoff = thoff;
+ pkt->xt.fragoff = ntohs(iph->frag_off) & IP_OFFSET;
+}
+
+static inline void
+__nft_netdev_set_pktinfo_ipv6(struct nft_pktinfo *pkt,
+ const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ struct ipv6hdr *ip6h, _ip6h;
+ unsigned int thoff = 0;
+ unsigned short frag_off;
+ int protohdr;
+ u32 pkt_len;
+
+ ip6h = skb_header_pointer(skb, skb_network_offset(skb), sizeof(*ip6h),
+ &_ip6h);
+ if (!ip6h)
+ return;
+
+ if (ip6h->version != 6)
+ return;
+
+ pkt_len = ntohs(ip6h->payload_len);
+ if (pkt_len + sizeof(*ip6h) > skb->len)
+ return;
+
+ protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, NULL);
+ if (protohdr < 0)
+ return;
+
+ pkt->tprot = protohdr;
+ pkt->xt.thoff = thoff;
+ pkt->xt.fragoff = frag_off;
+#endif
+}
+
+static inline void nft_netdev_set_pktinfo_ipv6(struct nft_pktinfo *pkt,
+ const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ nft_set_pktinfo(pkt, ops, skb, state);
+ __nft_netdev_set_pktinfo_ipv6(pkt, ops, skb, state);
+}
+
+static unsigned int
+nft_do_chain_netdev(const struct nf_hook_ops *ops, struct sk_buff *skb,
+ const struct nf_hook_state *state)
+{
+ struct nft_pktinfo pkt;
+
+ switch (eth_hdr(skb)->h_proto) {
+ case htons(ETH_P_IP):
+ nft_netdev_set_pktinfo_ipv4(&pkt, ops, skb, state);
+ break;
+ case htons(ETH_P_IPV6):
+ nft_netdev_set_pktinfo_ipv6(&pkt, ops, skb, state);
+ break;
+ default:
+ nft_set_pktinfo(&pkt, ops, skb, state);
+ break;
+ }
+
+ return nft_do_chain(&pkt, ops);
+}
+
+static struct nft_af_info nft_af_netdev __read_mostly = {
+ .family = NFPROTO_NETDEV,
+ .nhooks = NF_NETDEV_NUMHOOKS,
+ .owner = THIS_MODULE,
+ .flags = NFT_AF_NEEDS_DEV,
+ .nops = 1,
+ .hooks = {
+ [NF_NETDEV_INGRESS] = nft_do_chain_netdev,
+ },
+};
+
+static int nf_tables_netdev_init_net(struct net *net)
+{
+ net->nft.netdev = kmalloc(sizeof(struct nft_af_info), GFP_KERNEL);
+ if (net->nft.netdev == NULL)
+ return -ENOMEM;
+
+ memcpy(net->nft.netdev, &nft_af_netdev, sizeof(nft_af_netdev));
+
+ if (nft_register_afinfo(net, net->nft.netdev) < 0)
+ goto err;
+
+ return 0;
+err:
+ kfree(net->nft.netdev);
+ return -ENOMEM;
+}
+
+static void nf_tables_netdev_exit_net(struct net *net)
+{
+ nft_unregister_afinfo(net->nft.netdev);
+ kfree(net->nft.netdev);
+}
+
+static struct pernet_operations nf_tables_netdev_net_ops = {
+ .init = nf_tables_netdev_init_net,
+ .exit = nf_tables_netdev_exit_net,
+};
+
+static const struct nf_chain_type nft_filter_chain_netdev = {
+ .name = "filter",
+ .type = NFT_CHAIN_T_DEFAULT,
+ .family = NFPROTO_NETDEV,
+ .owner = THIS_MODULE,
+ .hook_mask = (1 << NF_NETDEV_INGRESS),
+};
+
+static int __init nf_tables_netdev_init(void)
+{
+ int ret;
+
+ nft_register_chain_type(&nft_filter_chain_netdev);
+ ret = register_pernet_subsys(&nf_tables_netdev_net_ops);
+ if (ret < 0)
+ nft_unregister_chain_type(&nft_filter_chain_netdev);
+
+ return ret;
+}
+
+static void __exit nf_tables_netdev_exit(void)
+{
+ unregister_pernet_subsys(&nf_tables_netdev_net_ops);
+ nft_unregister_chain_type(&nft_filter_chain_netdev);
+}
+
+module_init(nf_tables_netdev_init);
+module_exit(nf_tables_netdev_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_ALIAS_NFT_FAMILY(5); /* NFPROTO_NETDEV */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 04:49:30 +0000