--- /dev/null
+#ifndef _NFT_FIB_H_
+#define _NFT_FIB_H_
+
+struct nft_fib {
+ enum nft_registers dreg:8;
+ u8 result;
+ u32 flags;
+};
+
+extern const struct nla_policy nft_fib_policy[];
+
+int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr);
+int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
+ const struct nlattr * const tb[]);
+int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
+ const struct nft_data **data);
+
+
+void nft_fib4_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt);
+void nft_fib4_eval(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt);
+
+void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt);
+void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt);
+
+void nft_fib_store_result(void *reg, enum nft_fib_result r,
+ const struct nft_pktinfo *pkt, int index);
+#endif
};
#define NFTA_GEN_MAX (__NFTA_GEN_MAX - 1)
+/*
+ * enum nft_fib_attributes - nf_tables fib expression netlink attributes
+ *
+ * @NFTA_FIB_DREG: destination register (NLA_U32)
+ * @NFTA_FIB_RESULT: desired result (NLA_U32)
+ * @NFTA_FIB_FLAGS: flowi fields to initialize when querying the FIB (NLA_U32)
+ *
+ * The FIB expression performs a route lookup according
+ * to the packet data.
+ */
+enum nft_fib_attributes {
+ NFTA_FIB_UNSPEC,
+ NFTA_FIB_DREG,
+ NFTA_FIB_RESULT,
+ NFTA_FIB_FLAGS,
+ __NFTA_FIB_MAX
+};
+#define NFTA_FIB_MAX (__NFTA_FIB_MAX - 1)
+
+enum nft_fib_result {
+ NFT_FIB_RESULT_UNSPEC,
+ NFT_FIB_RESULT_OIF,
+ NFT_FIB_RESULT_OIFNAME,
+ NFT_FIB_RESULT_ADDRTYPE,
+ __NFT_FIB_RESULT_MAX
+};
+#define NFT_FIB_RESULT_MAX (__NFT_FIB_RESULT_MAX - 1)
+
+enum nft_fib_flags {
+ NFTA_FIB_F_SADDR = 1 << 0, /* look up src */
+ NFTA_FIB_F_DADDR = 1 << 1, /* look up dst */
+ NFTA_FIB_F_MARK = 1 << 2, /* use skb->mark */
+ NFTA_FIB_F_IIF = 1 << 3, /* restrict to iif */
+ NFTA_FIB_F_OIF = 1 << 4, /* restrict to oif */
+};
+
/**
* enum nft_trace_attributes - nf_tables trace netlink attributes
*
help
This module enables IPv4 packet duplication support for nf_tables.
+config NFT_FIB_IPV4
+ select NFT_FIB
+ tristate "nf_tables fib / ip route lookup support"
+ help
+ This module enables IPv4 FIB lookups, e.g. for reverse path filtering.
+ It also allows query of the FIB for the route type, e.g. local, unicast,
+ multicast or blackhole.
+
endif # NF_TABLES_IPV4
config NF_TABLES_ARP
obj-$(CONFIG_NFT_CHAIN_ROUTE_IPV4) += nft_chain_route_ipv4.o
obj-$(CONFIG_NFT_CHAIN_NAT_IPV4) += nft_chain_nat_ipv4.o
obj-$(CONFIG_NFT_REJECT_IPV4) += nft_reject_ipv4.o
+obj-$(CONFIG_NFT_FIB_IPV4) += nft_fib_ipv4.o
obj-$(CONFIG_NFT_MASQ_IPV4) += nft_masq_ipv4.o
obj-$(CONFIG_NFT_REDIR_IPV4) += nft_redir_ipv4.o
obj-$(CONFIG_NFT_DUP_IPV4) += nft_dup_ipv4.o
--- /dev/null
+/*
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_fib.h>
+
+#include <net/ip_fib.h>
+#include <net/route.h>
+
+/* don't try to find route from mcast/bcast/zeronet */
+static __be32 get_saddr(__be32 addr)
+{
+ if (ipv4_is_multicast(addr) || ipv4_is_lbcast(addr) ||
+ ipv4_is_zeronet(addr))
+ return 0;
+ return addr;
+}
+
+static bool fib4_is_local(const struct sk_buff *skb)
+{
+ const struct rtable *rt = skb_rtable(skb);
+
+ return rt && (rt->rt_flags & RTCF_LOCAL);
+}
+
+#define DSCP_BITS 0xfc
+
+void nft_fib4_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+ u32 *dst = ®s->data[priv->dreg];
+ const struct net_device *dev = NULL;
+ const struct iphdr *iph;
+ __be32 addr;
+
+ if (priv->flags & NFTA_FIB_F_IIF)
+ dev = pkt->in;
+ else if (priv->flags & NFTA_FIB_F_OIF)
+ dev = pkt->out;
+
+ iph = ip_hdr(pkt->skb);
+ if (priv->flags & NFTA_FIB_F_DADDR)
+ addr = iph->daddr;
+ else
+ addr = iph->saddr;
+
+ *dst = inet_dev_addr_type(pkt->net, dev, addr);
+}
+EXPORT_SYMBOL_GPL(nft_fib4_eval_type);
+
+static int get_ifindex(const struct net_device *dev)
+{
+ return dev ? dev->ifindex : 0;
+}
+
+void nft_fib4_eval(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+ u32 *dest = ®s->data[priv->dreg];
+ const struct iphdr *iph;
+ struct fib_result res;
+ struct flowi4 fl4 = {
+ .flowi4_scope = RT_SCOPE_UNIVERSE,
+ .flowi4_iif = LOOPBACK_IFINDEX,
+ };
+ const struct net_device *oif;
+ struct net_device *found;
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+ int i;
+#endif
+
+ /*
+ * Do not set flowi4_oif, it restricts results (for example, asking
+ * for oif 3 will get RTN_UNICAST result even if the daddr exits
+ * on another interface.
+ *
+ * Search results for the desired outinterface instead.
+ */
+ if (priv->flags & NFTA_FIB_F_OIF)
+ oif = pkt->out;
+ else if (priv->flags & NFTA_FIB_F_IIF)
+ oif = pkt->in;
+ else
+ oif = NULL;
+
+ if (pkt->hook == NF_INET_PRE_ROUTING && fib4_is_local(pkt->skb)) {
+ nft_fib_store_result(dest, priv->result, pkt, LOOPBACK_IFINDEX);
+ return;
+ }
+
+ iph = ip_hdr(pkt->skb);
+ if (ipv4_is_multicast(iph->daddr) &&
+ ipv4_is_zeronet(iph->saddr) &&
+ ipv4_is_local_multicast(iph->daddr)) {
+ nft_fib_store_result(dest, priv->result, pkt,
+ get_ifindex(pkt->skb->dev));
+ return;
+ }
+
+ if (priv->flags & NFTA_FIB_F_MARK)
+ fl4.flowi4_mark = pkt->skb->mark;
+
+ fl4.flowi4_tos = iph->tos & DSCP_BITS;
+
+ if (priv->flags & NFTA_FIB_F_DADDR) {
+ fl4.daddr = iph->daddr;
+ fl4.saddr = get_saddr(iph->saddr);
+ } else {
+ fl4.daddr = iph->saddr;
+ fl4.saddr = get_saddr(iph->daddr);
+ }
+
+ if (fib_lookup(pkt->net, &fl4, &res, FIB_LOOKUP_IGNORE_LINKSTATE))
+ return;
+
+ switch (res.type) {
+ case RTN_UNICAST:
+ break;
+ case RTN_LOCAL: /* should not appear here, see fib4_is_local() above */
+ return;
+ default:
+ break;
+ }
+
+ if (!oif) {
+ found = FIB_RES_DEV(res);
+ goto ok;
+ }
+
+#ifdef CONFIG_IP_ROUTE_MULTIPATH
+ for (i = 0; i < res.fi->fib_nhs; i++) {
+ struct fib_nh *nh = &res.fi->fib_nh[i];
+
+ if (nh->nh_dev == oif) {
+ found = nh->nh_dev;
+ goto ok;
+ }
+ }
+ return;
+#else
+ found = FIB_RES_DEV(res);
+ if (found != oif)
+ return;
+#endif
+ok:
+ switch (priv->result) {
+ case NFT_FIB_RESULT_OIF:
+ *dest = found->ifindex;
+ break;
+ case NFT_FIB_RESULT_OIFNAME:
+ strncpy((char *)dest, found->name, IFNAMSIZ);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+}
+EXPORT_SYMBOL_GPL(nft_fib4_eval);
+
+static struct nft_expr_type nft_fib4_type;
+
+static const struct nft_expr_ops nft_fib4_type_ops = {
+ .type = &nft_fib4_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
+ .eval = nft_fib4_eval_type,
+ .init = nft_fib_init,
+ .dump = nft_fib_dump,
+ .validate = nft_fib_validate,
+};
+
+static const struct nft_expr_ops nft_fib4_ops = {
+ .type = &nft_fib4_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
+ .eval = nft_fib4_eval,
+ .init = nft_fib_init,
+ .dump = nft_fib_dump,
+ .validate = nft_fib_validate,
+};
+
+static const struct nft_expr_ops *
+nft_fib4_select_ops(const struct nft_ctx *ctx,
+ const struct nlattr * const tb[])
+{
+ enum nft_fib_result result;
+
+ if (!tb[NFTA_FIB_RESULT])
+ return ERR_PTR(-EINVAL);
+
+ result = htonl(nla_get_be32(tb[NFTA_FIB_RESULT]));
+
+ switch (result) {
+ case NFT_FIB_RESULT_OIF:
+ return &nft_fib4_ops;
+ case NFT_FIB_RESULT_OIFNAME:
+ return &nft_fib4_ops;
+ case NFT_FIB_RESULT_ADDRTYPE:
+ return &nft_fib4_type_ops;
+ default:
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+}
+
+static struct nft_expr_type nft_fib4_type __read_mostly = {
+ .name = "fib",
+ .select_ops = &nft_fib4_select_ops,
+ .policy = nft_fib_policy,
+ .maxattr = NFTA_FIB_MAX,
+ .family = NFPROTO_IPV4,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_fib4_module_init(void)
+{
+ return nft_register_expr(&nft_fib4_type);
+}
+
+static void __exit nft_fib4_module_exit(void)
+{
+ nft_unregister_expr(&nft_fib4_type);
+}
+
+module_init(nft_fib4_module_init);
+module_exit(nft_fib4_module_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
+MODULE_ALIAS_NFT_AF_EXPR(2, "fib");
help
This module enables IPv6 packet duplication support for nf_tables.
+config NFT_FIB_IPV6
+ tristate "nf_tables fib / ipv6 route lookup support"
+ select NFT_FIB
+ help
+ This module enables IPv6 FIB lookups, e.g. for reverse path filtering.
+ It also allows query of the FIB for the route type, e.g. local, unicast,
+ multicast or blackhole.
+
endif # NF_TABLES_IPV6
endif # NF_TABLES
obj-$(CONFIG_NFT_MASQ_IPV6) += nft_masq_ipv6.o
obj-$(CONFIG_NFT_REDIR_IPV6) += nft_redir_ipv6.o
obj-$(CONFIG_NFT_DUP_IPV6) += nft_dup_ipv6.o
+obj-$(CONFIG_NFT_FIB_IPV6) += nft_fib_ipv6.o
# matches
obj-$(CONFIG_IP6_NF_MATCH_AH) += ip6t_ah.o
--- /dev/null
+/*
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter_ipv6.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_fib.h>
+
+#include <net/ip6_fib.h>
+#include <net/ip6_route.h>
+
+static bool fib6_is_local(const struct sk_buff *skb)
+{
+ const struct rt6_info *rt = (const void *)skb_dst(skb);
+
+ return rt && (rt->rt6i_flags & RTF_LOCAL);
+}
+
+static int get_ifindex(const struct net_device *dev)
+{
+ return dev ? dev->ifindex : 0;
+}
+
+static int nft_fib6_flowi_init(struct flowi6 *fl6, const struct nft_fib *priv,
+ const struct nft_pktinfo *pkt,
+ const struct net_device *dev)
+{
+ const struct ipv6hdr *iph = ipv6_hdr(pkt->skb);
+ int lookup_flags = 0;
+
+ if (priv->flags & NFTA_FIB_F_DADDR) {
+ fl6->daddr = iph->daddr;
+ fl6->saddr = iph->saddr;
+ } else {
+ fl6->daddr = iph->saddr;
+ fl6->saddr = iph->daddr;
+ }
+
+ if (ipv6_addr_type(&fl6->daddr) & IPV6_ADDR_LINKLOCAL) {
+ lookup_flags |= RT6_LOOKUP_F_IFACE;
+ fl6->flowi6_oif = get_ifindex(dev ? dev : pkt->skb->dev);
+ }
+
+ if (ipv6_addr_type(&fl6->saddr) & IPV6_ADDR_UNICAST)
+ lookup_flags |= RT6_LOOKUP_F_HAS_SADDR;
+
+ if (priv->flags & NFTA_FIB_F_MARK)
+ fl6->flowi6_mark = pkt->skb->mark;
+
+ fl6->flowlabel = (*(__be32 *)iph) & IPV6_FLOWINFO_MASK;
+
+ return lookup_flags;
+}
+
+static u32 __nft_fib6_eval_type(const struct nft_fib *priv,
+ const struct nft_pktinfo *pkt)
+{
+ const struct net_device *dev = NULL;
+ const struct nf_ipv6_ops *v6ops;
+ const struct nf_afinfo *afinfo;
+ int route_err, addrtype;
+ struct rt6_info *rt;
+ struct flowi6 fl6 = {
+ .flowi6_iif = LOOPBACK_IFINDEX,
+ .flowi6_proto = pkt->tprot,
+ };
+ u32 ret = 0;
+
+ afinfo = nf_get_afinfo(NFPROTO_IPV6);
+ if (!afinfo)
+ return RTN_UNREACHABLE;
+
+ if (priv->flags & NFTA_FIB_F_IIF)
+ dev = pkt->in;
+ else if (priv->flags & NFTA_FIB_F_OIF)
+ dev = pkt->out;
+
+ nft_fib6_flowi_init(&fl6, priv, pkt, dev);
+
+ v6ops = nf_get_ipv6_ops();
+ if (dev && v6ops && v6ops->chk_addr(pkt->net, &fl6.daddr, dev, true))
+ ret = RTN_LOCAL;
+
+ route_err = afinfo->route(pkt->net, (struct dst_entry **)&rt,
+ flowi6_to_flowi(&fl6), false);
+ if (route_err)
+ goto err;
+
+ if (rt->rt6i_flags & RTF_REJECT) {
+ route_err = rt->dst.error;
+ dst_release(&rt->dst);
+ goto err;
+ }
+
+ if (ipv6_anycast_destination((struct dst_entry *)rt, &fl6.daddr))
+ ret = RTN_ANYCAST;
+ else if (!dev && rt->rt6i_flags & RTF_LOCAL)
+ ret = RTN_LOCAL;
+
+ dst_release(&rt->dst);
+
+ if (ret)
+ return ret;
+
+ addrtype = ipv6_addr_type(&fl6.daddr);
+
+ if (addrtype & IPV6_ADDR_MULTICAST)
+ return RTN_MULTICAST;
+ if (addrtype & IPV6_ADDR_UNICAST)
+ return RTN_UNICAST;
+
+ return RTN_UNSPEC;
+ err:
+ switch (route_err) {
+ case -EINVAL:
+ return RTN_BLACKHOLE;
+ case -EACCES:
+ return RTN_PROHIBIT;
+ case -EAGAIN:
+ return RTN_THROW;
+ default:
+ break;
+ }
+
+ return RTN_UNREACHABLE;
+}
+
+void nft_fib6_eval_type(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+ u32 *dest = ®s->data[priv->dreg];
+
+ *dest = __nft_fib6_eval_type(priv, pkt);
+}
+EXPORT_SYMBOL_GPL(nft_fib6_eval_type);
+
+void nft_fib6_eval(const struct nft_expr *expr, struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+ const struct net_device *oif = NULL;
+ u32 *dest = ®s->data[priv->dreg];
+ struct flowi6 fl6 = {
+ .flowi6_iif = LOOPBACK_IFINDEX,
+ .flowi6_proto = pkt->tprot,
+ };
+ struct rt6_info *rt;
+ int lookup_flags;
+
+ if (priv->flags & NFTA_FIB_F_IIF)
+ oif = pkt->in;
+ else if (priv->flags & NFTA_FIB_F_OIF)
+ oif = pkt->out;
+
+ lookup_flags = nft_fib6_flowi_init(&fl6, priv, pkt, oif);
+
+ if (pkt->hook == NF_INET_PRE_ROUTING && fib6_is_local(pkt->skb)) {
+ nft_fib_store_result(dest, priv->result, pkt, LOOPBACK_IFINDEX);
+ return;
+ }
+
+ *dest = 0;
+ again:
+ rt = (void *)ip6_route_lookup(pkt->net, &fl6, lookup_flags);
+ if (rt->dst.error)
+ goto put_rt_err;
+
+ /* Should not see RTF_LOCAL here */
+ if (rt->rt6i_flags & (RTF_REJECT | RTF_ANYCAST | RTF_LOCAL))
+ goto put_rt_err;
+
+ if (oif && oif != rt->rt6i_idev->dev) {
+ /* multipath route? Try again with F_IFACE */
+ if ((lookup_flags & RT6_LOOKUP_F_IFACE) == 0) {
+ lookup_flags |= RT6_LOOKUP_F_IFACE;
+ fl6.flowi6_oif = oif->ifindex;
+ ip6_rt_put(rt);
+ goto again;
+ }
+ }
+
+ switch (priv->result) {
+ case NFT_FIB_RESULT_OIF:
+ *dest = rt->rt6i_idev->dev->ifindex;
+ break;
+ case NFT_FIB_RESULT_OIFNAME:
+ strncpy((char *)dest, rt->rt6i_idev->dev->name, IFNAMSIZ);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ break;
+ }
+
+ put_rt_err:
+ ip6_rt_put(rt);
+}
+EXPORT_SYMBOL_GPL(nft_fib6_eval);
+
+static struct nft_expr_type nft_fib6_type;
+
+static const struct nft_expr_ops nft_fib6_type_ops = {
+ .type = &nft_fib6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
+ .eval = nft_fib6_eval_type,
+ .init = nft_fib_init,
+ .dump = nft_fib_dump,
+ .validate = nft_fib_validate,
+};
+
+static const struct nft_expr_ops nft_fib6_ops = {
+ .type = &nft_fib6_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
+ .eval = nft_fib6_eval,
+ .init = nft_fib_init,
+ .dump = nft_fib_dump,
+ .validate = nft_fib_validate,
+};
+
+static const struct nft_expr_ops *
+nft_fib6_select_ops(const struct nft_ctx *ctx,
+ const struct nlattr * const tb[])
+{
+ enum nft_fib_result result;
+
+ if (!tb[NFTA_FIB_RESULT])
+ return ERR_PTR(-EINVAL);
+
+ result = htonl(nla_get_be32(tb[NFTA_FIB_RESULT]));
+
+ switch (result) {
+ case NFT_FIB_RESULT_OIF:
+ return &nft_fib6_ops;
+ case NFT_FIB_RESULT_OIFNAME:
+ return &nft_fib6_ops;
+ case NFT_FIB_RESULT_ADDRTYPE:
+ return &nft_fib6_type_ops;
+ default:
+ return ERR_PTR(-EOPNOTSUPP);
+ }
+}
+
+static struct nft_expr_type nft_fib6_type __read_mostly = {
+ .name = "fib",
+ .select_ops = &nft_fib6_select_ops,
+ .policy = nft_fib_policy,
+ .maxattr = NFTA_FIB_MAX,
+ .family = NFPROTO_IPV6,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_fib6_module_init(void)
+{
+ return nft_register_expr(&nft_fib6_type);
+}
+
+static void __exit nft_fib6_module_exit(void)
+{
+ nft_unregister_expr(&nft_fib6_type);
+}
+module_init(nft_fib6_module_init);
+module_exit(nft_fib6_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
+MODULE_ALIAS_NFT_AF_EXPR(10, "fib");
This option adds the "hash" expression that you can use to perform
a hash operation on registers.
+config NFT_FIB
+ tristate
+
+config NFT_FIB_INET
+ depends on NF_TABLES_INET
+ depends on NFT_FIB_IPV4
+ depends on NFT_FIB_IPV6
+ tristate "Netfilter nf_tables fib inet support"
+ help
+ This option allows using the FIB expression from the inet table.
+ The lookup will be delegated to the IPv4 or IPv6 FIB depending
+ on the protocol of the packet.
+
if NF_TABLES_NETDEV
config NF_DUP_NETDEV
obj-$(CONFIG_NFT_MASQ) += nft_masq.o
obj-$(CONFIG_NFT_REDIR) += nft_redir.o
obj-$(CONFIG_NFT_HASH) += nft_hash.o
+obj-$(CONFIG_NFT_FIB) += nft_fib.o
+obj-$(CONFIG_NFT_FIB_INET) += nft_fib_inet.o
# nf_tables netdev
obj-$(CONFIG_NFT_DUP_NETDEV) += nft_dup_netdev.o
--- /dev/null
+/*
+ * 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.
+ *
+ * Generic part shared by ipv4 and ipv6 backends.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nft_fib.h>
+
+const struct nla_policy nft_fib_policy[NFTA_FIB_MAX + 1] = {
+ [NFTA_FIB_DREG] = { .type = NLA_U32 },
+ [NFTA_FIB_RESULT] = { .type = NLA_U32 },
+ [NFTA_FIB_FLAGS] = { .type = NLA_U32 },
+};
+EXPORT_SYMBOL(nft_fib_policy);
+
+#define NFTA_FIB_F_ALL (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR | \
+ NFTA_FIB_F_MARK | NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)
+
+int nft_fib_validate(const struct nft_ctx *ctx, const struct nft_expr *expr,
+ const struct nft_data **data)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+ unsigned int hooks;
+
+ switch (priv->result) {
+ case NFT_FIB_RESULT_OIF: /* fallthrough */
+ case NFT_FIB_RESULT_OIFNAME:
+ hooks = (1 << NF_INET_PRE_ROUTING);
+ break;
+ case NFT_FIB_RESULT_ADDRTYPE:
+ if (priv->flags & NFTA_FIB_F_IIF)
+ hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_FORWARD);
+ else if (priv->flags & NFTA_FIB_F_OIF)
+ hooks = (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_POST_ROUTING) |
+ (1 << NF_INET_FORWARD);
+ else
+ hooks = (1 << NF_INET_LOCAL_IN) |
+ (1 << NF_INET_LOCAL_OUT) |
+ (1 << NF_INET_FORWARD) |
+ (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_POST_ROUTING);
+
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return nft_chain_validate_hooks(ctx->chain, hooks);
+}
+EXPORT_SYMBOL_GPL(nft_fib_validate);
+
+int nft_fib_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ struct nft_fib *priv = nft_expr_priv(expr);
+ unsigned int len;
+ int err;
+
+ if (!tb[NFTA_FIB_DREG] || !tb[NFTA_FIB_RESULT] || !tb[NFTA_FIB_FLAGS])
+ return -EINVAL;
+
+ priv->flags = ntohl(nla_get_be32(tb[NFTA_FIB_FLAGS]));
+
+ if (priv->flags == 0 || (priv->flags & ~NFTA_FIB_F_ALL))
+ return -EINVAL;
+
+ if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) ==
+ (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR))
+ return -EINVAL;
+ if ((priv->flags & (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF)) ==
+ (NFTA_FIB_F_IIF | NFTA_FIB_F_OIF))
+ return -EINVAL;
+ if ((priv->flags & (NFTA_FIB_F_SADDR | NFTA_FIB_F_DADDR)) == 0)
+ return -EINVAL;
+
+ priv->result = htonl(nla_get_be32(tb[NFTA_FIB_RESULT]));
+ priv->dreg = nft_parse_register(tb[NFTA_FIB_DREG]);
+
+ switch (priv->result) {
+ case NFT_FIB_RESULT_OIF:
+ if (priv->flags & NFTA_FIB_F_OIF)
+ return -EINVAL;
+ len = sizeof(int);
+ break;
+ case NFT_FIB_RESULT_OIFNAME:
+ if (priv->flags & NFTA_FIB_F_OIF)
+ return -EINVAL;
+ len = IFNAMSIZ;
+ break;
+ case NFT_FIB_RESULT_ADDRTYPE:
+ len = sizeof(u32);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ err = nft_validate_register_store(ctx, priv->dreg, NULL,
+ NFT_DATA_VALUE, len);
+ if (err < 0)
+ return err;
+
+ return nft_fib_validate(ctx, expr, NULL);
+}
+EXPORT_SYMBOL_GPL(nft_fib_init);
+
+int nft_fib_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+
+ if (nft_dump_register(skb, NFTA_FIB_DREG, priv->dreg))
+ return -1;
+
+ if (nla_put_be32(skb, NFTA_FIB_RESULT, htonl(priv->result)))
+ return -1;
+
+ if (nla_put_be32(skb, NFTA_FIB_FLAGS, htonl(priv->flags)))
+ return -1;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nft_fib_dump);
+
+void nft_fib_store_result(void *reg, enum nft_fib_result r,
+ const struct nft_pktinfo *pkt, int index)
+{
+ struct net_device *dev;
+ u32 *dreg = reg;
+
+ switch (r) {
+ case NFT_FIB_RESULT_OIF:
+ *dreg = index;
+ break;
+ case NFT_FIB_RESULT_OIFNAME:
+ dev = dev_get_by_index_rcu(pkt->net, index);
+ strncpy(reg, dev ? dev->name : "", IFNAMSIZ);
+ break;
+ default:
+ WARN_ON_ONCE(1);
+ *dreg = 0;
+ break;
+ }
+}
+EXPORT_SYMBOL_GPL(nft_fib_store_result);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
--- /dev/null
+/*
+ * 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/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_core.h>
+#include <net/netfilter/nf_tables.h>
+
+#include <net/netfilter/nft_fib.h>
+
+static void nft_fib_inet_eval(const struct nft_expr *expr,
+ struct nft_regs *regs,
+ const struct nft_pktinfo *pkt)
+{
+ const struct nft_fib *priv = nft_expr_priv(expr);
+
+ switch (pkt->pf) {
+ case NFPROTO_IPV4:
+ switch (priv->result) {
+ case NFT_FIB_RESULT_OIF:
+ case NFT_FIB_RESULT_OIFNAME:
+ return nft_fib4_eval(expr, regs, pkt);
+ case NFT_FIB_RESULT_ADDRTYPE:
+ return nft_fib4_eval_type(expr, regs, pkt);
+ }
+ break;
+ case NFPROTO_IPV6:
+ switch (priv->result) {
+ case NFT_FIB_RESULT_OIF:
+ case NFT_FIB_RESULT_OIFNAME:
+ return nft_fib6_eval(expr, regs, pkt);
+ case NFT_FIB_RESULT_ADDRTYPE:
+ return nft_fib6_eval_type(expr, regs, pkt);
+ }
+ break;
+ }
+
+ regs->verdict.code = NF_DROP;
+}
+
+static struct nft_expr_type nft_fib_inet_type;
+static const struct nft_expr_ops nft_fib_inet_ops = {
+ .type = &nft_fib_inet_type,
+ .size = NFT_EXPR_SIZE(sizeof(struct nft_fib)),
+ .eval = nft_fib_inet_eval,
+ .init = nft_fib_init,
+ .dump = nft_fib_dump,
+ .validate = nft_fib_validate,
+};
+
+static struct nft_expr_type nft_fib_inet_type __read_mostly = {
+ .family = NFPROTO_INET,
+ .name = "fib",
+ .ops = &nft_fib_inet_ops,
+ .policy = nft_fib_policy,
+ .maxattr = NFTA_FIB_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_fib_inet_module_init(void)
+{
+ return nft_register_expr(&nft_fib_inet_type);
+}
+
+static void __exit nft_fib_inet_module_exit(void)
+{
+ nft_unregister_expr(&nft_fib_inet_type);
+}
+
+module_init(nft_fib_inet_module_init);
+module_exit(nft_fib_inet_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Florian Westphal <fw@strlen.de>");
+MODULE_ALIAS_NFT_AF_EXPR(1, "fib");
projects / linux-beck.git / commitdiff