#include <linux/list.h>
#include <linux/netfilter.h>
+#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netlink.h>
u8 hooknum;
u8 nhoff;
u8 thoff;
+ /* for x_tables compatibility */
+ struct xt_action_param xt;
};
+static inline void nft_set_pktinfo(struct nft_pktinfo *pkt,
+ const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out)
+{
+ pkt->skb = skb;
+ pkt->in = pkt->xt.in = in;
+ pkt->out = pkt->xt.out = out;
+ pkt->hooknum = pkt->xt.hooknum = ops->hooknum;
+ pkt->xt.family = ops->pf;
+}
+
struct nft_data {
union {
u32 data[4];
* @afi: address family info
* @table: the table the chain is contained in
* @chain: the chain the rule is contained in
+ * @nla: netlink attributes
*/
struct nft_ctx {
const struct sk_buff *skb;
const struct nft_af_info *afi;
const struct nft_table *table;
const struct nft_chain *chain;
+ const struct nlattr * const *nla;
};
struct nft_data_desc {
* @maxattr: highest netlink attribute number
*/
struct nft_expr_type {
- const struct nft_expr_ops *(*select_ops)(const struct nlattr * const tb[]);
+ const struct nft_expr_ops *(*select_ops)(const struct nft_ctx *,
+ const struct nlattr * const tb[]);
const struct nft_expr_ops *ops;
struct list_head list;
const char *name;
* @destroy: destruction function
* @dump: function to dump parameters
* @type: expression type
+ * @validate: validate expression, called during loop detection
+ * @data: extra data to attach to this expression operation
*/
struct nft_expr;
struct nft_expr_ops {
void (*destroy)(const struct nft_expr *expr);
int (*dump)(struct sk_buff *skb,
const struct nft_expr *expr);
- const struct nft_data * (*get_verdict)(const struct nft_expr *expr);
+ int (*validate)(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nft_data **data);
const struct nft_expr_type *type;
+ void *data;
};
#define NFT_EXPR_MAXATTR 16
NFT_CHAIN_T_MAX
};
+struct nft_stats {
+ u64 bytes;
+ u64 pkts;
+};
+
/**
* struct nft_base_chain - nf_tables base chain
*
* @ops: netfilter hook ops
* @type: chain type
+ * @policy: default policy
+ * @stats: per-cpu chain stats
* @chain: the chain
*/
struct nft_base_chain {
struct nf_hook_ops ops;
enum nft_chain_type type;
+ u8 policy;
+ struct nft_stats __percpu *stats;
struct nft_chain chain;
};
return container_of(chain, struct nft_base_chain, chain);
}
-extern unsigned int nft_do_chain(const struct nf_hook_ops *ops,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *));
+extern unsigned int nft_do_chain_pktinfo(struct nft_pktinfo *pkt,
+ const struct nf_hook_ops *ops);
/**
* struct nft_table - nf_tables table
--- /dev/null
+#ifndef _NF_TABLES_IPV4_H_
+#define _NF_TABLES_IPV4_H_
+
+#include <net/netfilter/nf_tables.h>
+#include <net/ip.h>
+
+static inline void
+nft_set_pktinfo_ipv4(struct nft_pktinfo *pkt,
+ const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out)
+{
+ struct iphdr *ip;
+
+ nft_set_pktinfo(pkt, ops, skb, in, out);
+
+ pkt->xt.thoff = ip_hdrlen(pkt->skb);
+ ip = ip_hdr(pkt->skb);
+ pkt->xt.fragoff = ntohs(ip->frag_off) & IP_OFFSET;
+}
+
+#endif
--- /dev/null
+#ifndef _NF_TABLES_IPV6_H_
+#define _NF_TABLES_IPV6_H_
+
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/ipv6.h>
+
+static inline int
+nft_set_pktinfo_ipv6(struct nft_pktinfo *pkt,
+ const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out)
+{
+ int protohdr, thoff = 0;
+ unsigned short frag_off;
+
+ nft_set_pktinfo(pkt, ops, skb, in, out);
+
+ protohdr = ipv6_find_hdr(pkt->skb, &thoff, -1, &frag_off, NULL);
+ /* If malformed, drop it */
+ if (protohdr < 0)
+ return -1;
+
+ pkt->xt.thoff = thoff;
+ pkt->xt.fragoff = frag_off;
+
+ return 0;
+}
+
+#endif
header-y += nf_conntrack_tcp.h
header-y += nf_conntrack_tuple_common.h
header-y += nf_tables.h
+header-y += nf_tables_compat.h
header-y += nf_nat.h
header-y += nfnetlink.h
header-y += nfnetlink_acct.h
* @NFTA_CHAIN_HANDLE: numeric handle of the chain (NLA_U64)
* @NFTA_CHAIN_NAME: name of the chain (NLA_STRING)
* @NFTA_CHAIN_HOOK: hook specification for basechains (NLA_NESTED: nft_hook_attributes)
+ * @NFTA_CHAIN_POLICY: numeric policy of the chain (NLA_U32)
+ * @NFTA_CHAIN_USE: number of references to this chain (NLA_U32)
* @NFTA_CHAIN_TYPE: type name of the string (NLA_NUL_STRING)
+ * @NFTA_CHAIN_COUNTERS: counter specification of the chain (NLA_NESTED: nft_counter_attributes)
*/
enum nft_chain_attributes {
NFTA_CHAIN_UNSPEC,
NFTA_CHAIN_HANDLE,
NFTA_CHAIN_NAME,
NFTA_CHAIN_HOOK,
+ NFTA_CHAIN_POLICY,
+ NFTA_CHAIN_USE,
NFTA_CHAIN_TYPE,
+ NFTA_CHAIN_COUNTERS,
__NFTA_CHAIN_MAX
};
#define NFTA_CHAIN_MAX (__NFTA_CHAIN_MAX - 1)
* @NFTA_RULE_CHAIN: name of the chain containing the rule (NLA_STRING)
* @NFTA_RULE_HANDLE: numeric handle of the rule (NLA_U64)
* @NFTA_RULE_EXPRESSIONS: list of expressions (NLA_NESTED: nft_expr_attributes)
+ * @NFTA_RULE_COMPAT: compatibility specifications of the rule (NLA_NESTED: nft_rule_compat_attributes)
*/
enum nft_rule_attributes {
NFTA_RULE_UNSPEC,
NFTA_RULE_CHAIN,
NFTA_RULE_HANDLE,
NFTA_RULE_EXPRESSIONS,
+ NFTA_RULE_COMPAT,
__NFTA_RULE_MAX
};
#define NFTA_RULE_MAX (__NFTA_RULE_MAX - 1)
+/**
+ * enum nft_rule_compat_flags - nf_tables rule compat flags
+ *
+ * @NFT_RULE_COMPAT_F_INV: invert the check result
+ */
+enum nft_rule_compat_flags {
+ NFT_RULE_COMPAT_F_INV = (1 << 1),
+ NFT_RULE_COMPAT_F_MASK = NFT_RULE_COMPAT_F_INV,
+};
+
+/**
+ * enum nft_rule_compat_attributes - nf_tables rule compat attributes
+ *
+ * @NFTA_RULE_COMPAT_PROTO: numerice value of handled protocol (NLA_U32)
+ * @NFTA_RULE_COMPAT_FLAGS: bitmask of enum nft_rule_compat_flags (NLA_U32)
+ */
+enum nft_rule_compat_attributes {
+ NFTA_RULE_COMPAT_UNSPEC,
+ NFTA_RULE_COMPAT_PROTO,
+ NFTA_RULE_COMPAT_FLAGS,
+ __NFTA_RULE_COMPAT_MAX
+};
+#define NFTA_RULE_COMPAT_MAX (__NFTA_RULE_COMPAT_MAX - 1)
+
/**
* enum nft_set_flags - nf_tables set flags
*
--- /dev/null
+#ifndef _NFT_COMPAT_NFNETLINK_H_
+#define _NFT_COMPAT_NFNETLINK_H_
+
+enum nft_target_attributes {
+ NFTA_TARGET_UNSPEC,
+ NFTA_TARGET_NAME,
+ NFTA_TARGET_REV,
+ NFTA_TARGET_INFO,
+ __NFTA_TARGET_MAX
+};
+#define NFTA_TARGET_MAX (__NFTA_TARGET_MAX - 1)
+
+enum nft_match_attributes {
+ NFTA_MATCH_UNSPEC,
+ NFTA_MATCH_NAME,
+ NFTA_MATCH_REV,
+ NFTA_MATCH_INFO,
+ __NFTA_MATCH_MAX
+};
+#define NFTA_MATCH_MAX (__NFTA_MATCH_MAX - 1)
+
+#define NFT_COMPAT_NAME_MAX 32
+
+enum {
+ NFNL_MSG_COMPAT_GET,
+ NFNL_MSG_COMPAT_MAX
+};
+
+enum {
+ NFTA_COMPAT_UNSPEC = 0,
+ NFTA_COMPAT_NAME,
+ NFTA_COMPAT_REV,
+ NFTA_COMPAT_TYPE,
+ __NFTA_COMPAT_MAX,
+};
+#define NFTA_COMPAT_MAX (__NFTA_COMPAT_MAX - 1)
+
+#endif
#define NFNL_SUBSYS_CTNETLINK_TIMEOUT 8
#define NFNL_SUBSYS_CTHELPER 9
#define NFNL_SUBSYS_NFTABLES 10
-#define NFNL_SUBSYS_COUNT 11
+#define NFNL_SUBSYS_NFT_COMPAT 11
+#define NFNL_SUBSYS_COUNT 12
#endif /* _UAPI_NFNETLINK_H */
#include <linux/netfilter_ipv4.h>
#include <net/netfilter/nf_tables.h>
#include <net/ip.h>
+#include <net/net_namespace.h>
+#include <net/netfilter/nf_tables_ipv4.h>
static unsigned int nft_ipv4_output(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
+ struct nft_pktinfo pkt;
+
if (unlikely(skb->len < sizeof(struct iphdr) ||
ip_hdr(skb)->ihl < sizeof(struct iphdr) / 4)) {
if (net_ratelimit())
"packet\n");
return NF_ACCEPT;
}
+ nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
- return nft_do_chain(ops, skb, in, out, okfn);
+ return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nft_af_info nft_af_ipv4 __read_mostly = {
},
};
+
+static unsigned int
+nft_do_chain_ipv4(const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct nft_pktinfo pkt;
+
+ nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
+
+ return nft_do_chain_pktinfo(&pkt, ops);
+}
+
static struct nf_chain_type filter_ipv4 = {
.family = NFPROTO_IPV4,
.name = "filter",
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.fn = {
- [NF_INET_LOCAL_IN] = nft_do_chain,
- [NF_INET_LOCAL_OUT] = nft_do_chain,
- [NF_INET_FORWARD] = nft_do_chain,
- [NF_INET_PRE_ROUTING] = nft_do_chain,
- [NF_INET_POST_ROUTING] = nft_do_chain,
+ [NF_INET_LOCAL_IN] = nft_do_chain_ipv4,
+ [NF_INET_LOCAL_OUT] = nft_ipv4_output,
+ [NF_INET_FORWARD] = nft_do_chain_ipv4,
+ [NF_INET_PRE_ROUTING] = nft_do_chain_ipv4,
+ [NF_INET_POST_ROUTING] = nft_do_chain_ipv4,
},
};
#include <net/netfilter/nf_nat.h>
#include <net/netfilter/nf_nat_core.h>
#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_ipv4.h>
#include <net/netfilter/nf_nat_l3proto.h>
#include <net/ip.h>
struct nf_conn *ct = nf_ct_get(skb, &ctinfo);
struct nf_conn_nat *nat;
enum nf_nat_manip_type maniptype = HOOK2MANIP(ops->hooknum);
+ struct nft_pktinfo pkt;
unsigned int ret;
if (ct == NULL || nf_ct_is_untracked(ct))
if (nf_nat_initialized(ct, maniptype))
break;
- ret = nft_do_chain(ops, skb, in, out, okfn);
+ nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
+
+ ret = nft_do_chain_pktinfo(&pkt, ops);
if (ret != NF_ACCEPT)
return ret;
if (!nf_nat_initialized(ct, maniptype)) {
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_ipv4.h>
#include <net/route.h>
#include <net/ip.h>
int (*okfn)(struct sk_buff *))
{
unsigned int ret;
+ struct nft_pktinfo pkt;
u32 mark;
__be32 saddr, daddr;
u_int8_t tos;
ip_hdrlen(skb) < sizeof(struct iphdr))
return NF_ACCEPT;
+ nft_set_pktinfo_ipv4(&pkt, ops, skb, in, out);
+
mark = skb->mark;
iph = ip_hdr(skb);
saddr = iph->saddr;
daddr = iph->daddr;
tos = iph->tos;
- ret = nft_do_chain(ops, skb, in, out, okfn);
+ ret = nft_do_chain_pktinfo(&pkt, ops);
if (ret != NF_DROP && ret != NF_QUEUE) {
iph = ip_hdr(skb);
#include <linux/ipv6.h>
#include <linux/netfilter_ipv6.h>
#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_ipv6.h>
static unsigned int nft_ipv6_output(const struct nf_hook_ops *ops,
struct sk_buff *skb,
const struct net_device *out,
int (*okfn)(struct sk_buff *))
{
+ struct nft_pktinfo pkt;
+
if (unlikely(skb->len < sizeof(struct ipv6hdr))) {
if (net_ratelimit())
pr_info("nf_tables_ipv6: ignoring short SOCK_RAW "
"packet\n");
return NF_ACCEPT;
}
+ if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
+ return NF_DROP;
- return nft_do_chain(ops, skb, in, out, okfn);
+ return nft_do_chain_pktinfo(&pkt, ops);
}
static struct nft_af_info nft_af_ipv6 __read_mostly = {
},
};
+static unsigned int
+nft_do_chain_ipv6(const struct nf_hook_ops *ops,
+ struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ int (*okfn)(struct sk_buff *))
+{
+ struct nft_pktinfo pkt;
+
+ /* malformed packet, drop it */
+ if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
+ return NF_DROP;
+
+ return nft_do_chain_pktinfo(&pkt, ops);
+}
+
static struct nf_chain_type filter_ipv6 = {
.family = NFPROTO_IPV6,
.name = "filter",
(1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_POST_ROUTING),
.fn = {
- [NF_INET_LOCAL_IN] = nft_do_chain,
- [NF_INET_LOCAL_OUT] = nft_do_chain,
- [NF_INET_FORWARD] = nft_do_chain,
- [NF_INET_PRE_ROUTING] = nft_do_chain,
- [NF_INET_POST_ROUTING] = nft_do_chain,
+ [NF_INET_LOCAL_IN] = nft_do_chain_ipv6,
+ [NF_INET_LOCAL_OUT] = nft_ipv6_output,
+ [NF_INET_FORWARD] = nft_do_chain_ipv6,
+ [NF_INET_PRE_ROUTING] = nft_do_chain_ipv6,
+ [NF_INET_POST_ROUTING] = nft_do_chain_ipv6,
},
};
#include <linux/netfilter/nfnetlink.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables.h>
+#include <net/netfilter/nf_tables_ipv6.h>
#include <net/route.h>
static unsigned int nf_route_table_hook(const struct nf_hook_ops *ops,
int (*okfn)(struct sk_buff *))
{
unsigned int ret;
+ struct nft_pktinfo pkt;
struct in6_addr saddr, daddr;
u_int8_t hop_limit;
u32 mark, flowlabel;
+ /* malformed packet, drop it */
+ if (nft_set_pktinfo_ipv6(&pkt, ops, skb, in, out) < 0)
+ return NF_DROP;
+
/* save source/dest address, mark, hoplimit, flowlabel, priority */
memcpy(&saddr, &ipv6_hdr(skb)->saddr, sizeof(saddr));
memcpy(&daddr, &ipv6_hdr(skb)->daddr, sizeof(daddr));
/* flowlabel and prio (includes version, which shouldn't change either */
flowlabel = *((u32 *)ipv6_hdr(skb));
- ret = nft_do_chain(ops, skb, in, out, okfn);
+ ret = nft_do_chain_pktinfo(&pkt, ops);
if (ret != NF_DROP && ret != NF_QUEUE &&
(memcmp(&ipv6_hdr(skb)->saddr, &saddr, sizeof(saddr)) ||
memcmp(&ipv6_hdr(skb)->daddr, &daddr, sizeof(daddr)) ||
depends on NF_TABLES
tristate "Netfilter nf_tables limit module"
+config NFT_COMPAT
+ depends on NF_TABLES
+ depends on NETFILTER_XTABLES
+ tristate "Netfilter x_tables over nf_tables module"
+ help
+ This is required if you intend to use any of existing
+ x_tables match/target extensions over the nf_tables
+ framework.
+
config NETFILTER_XTABLES
tristate "Netfilter Xtables support (required for ip_tables)"
default m if NETFILTER_ADVANCED=n
nf_tables-objs += nft_bitwise.o nft_byteorder.o nft_payload.o
obj-$(CONFIG_NF_TABLES) += nf_tables.o
+obj-$(CONFIG_NFT_COMPAT) += nft_compat.o
obj-$(CONFIG_NFT_EXTHDR) += nft_exthdr.o
obj-$(CONFIG_NFT_META) += nft_meta.o
obj-$(CONFIG_NFT_CT) += nft_ct.o
[NFTA_CHAIN_NAME] = { .type = NLA_STRING,
.len = NFT_CHAIN_MAXNAMELEN - 1 },
[NFTA_CHAIN_HOOK] = { .type = NLA_NESTED },
+ [NFTA_CHAIN_POLICY] = { .type = NLA_U32 },
[NFTA_CHAIN_TYPE] = { .type = NLA_NUL_STRING },
+ [NFTA_CHAIN_COUNTERS] = { .type = NLA_NESTED },
};
static const struct nla_policy nft_hook_policy[NFTA_HOOK_MAX + 1] = {
[NFTA_HOOK_PRIORITY] = { .type = NLA_U32 },
};
+static int nft_dump_stats(struct sk_buff *skb, struct nft_stats __percpu *stats)
+{
+ struct nft_stats *cpu_stats, total;
+ struct nlattr *nest;
+ int cpu;
+
+ memset(&total, 0, sizeof(total));
+ for_each_possible_cpu(cpu) {
+ cpu_stats = per_cpu_ptr(stats, cpu);
+ total.pkts += cpu_stats->pkts;
+ total.bytes += cpu_stats->bytes;
+ }
+ nest = nla_nest_start(skb, NFTA_CHAIN_COUNTERS);
+ if (nest == NULL)
+ goto nla_put_failure;
+
+ if (nla_put_be64(skb, NFTA_COUNTER_PACKETS, cpu_to_be64(total.pkts)) ||
+ nla_put_be64(skb, NFTA_COUNTER_BYTES, cpu_to_be64(total.bytes)))
+ goto nla_put_failure;
+
+ nla_nest_end(skb, nest);
+ return 0;
+
+nla_put_failure:
+ return -ENOSPC;
+}
+
static int nf_tables_fill_chain_info(struct sk_buff *skb, u32 portid, u32 seq,
int event, u32 flags, int family,
const struct nft_table *table,
goto nla_put_failure;
if (chain->flags & NFT_BASE_CHAIN) {
- const struct nf_hook_ops *ops = &nft_base_chain(chain)->ops;
- struct nlattr *nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
+ const struct nft_base_chain *basechain = nft_base_chain(chain);
+ const struct nf_hook_ops *ops = &basechain->ops;
+ struct nlattr *nest;
+
+ nest = nla_nest_start(skb, NFTA_CHAIN_HOOK);
if (nest == NULL)
goto nla_put_failure;
if (nla_put_be32(skb, NFTA_HOOK_HOOKNUM, htonl(ops->hooknum)))
goto nla_put_failure;
nla_nest_end(skb, nest);
+ if (nla_put_be32(skb, NFTA_CHAIN_POLICY,
+ htonl(basechain->policy)))
+ goto nla_put_failure;
+
if (nla_put_string(skb, NFTA_CHAIN_TYPE,
chain_type[ops->pf][nft_base_chain(chain)->type]->name))
goto nla_put_failure;
+
+ if (nft_dump_stats(skb, nft_base_chain(chain)->stats))
+ goto nla_put_failure;
}
+ if (nla_put_be32(skb, NFTA_CHAIN_USE, htonl(chain->use)))
+ goto nla_put_failure;
+
return nlmsg_end(skb, nlh);
nla_put_failure:
return err;
}
+static int
+nf_tables_chain_policy(struct nft_base_chain *chain, const struct nlattr *attr)
+{
+ switch (ntohl(nla_get_be32(attr))) {
+ case NF_DROP:
+ chain->policy = NF_DROP;
+ break;
+ case NF_ACCEPT:
+ chain->policy = NF_ACCEPT;
+ break;
+ default:
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static const struct nla_policy nft_counter_policy[NFTA_COUNTER_MAX + 1] = {
+ [NFTA_COUNTER_PACKETS] = { .type = NLA_U64 },
+ [NFTA_COUNTER_BYTES] = { .type = NLA_U64 },
+};
+
+static int
+nf_tables_counters(struct nft_base_chain *chain, const struct nlattr *attr)
+{
+ struct nlattr *tb[NFTA_COUNTER_MAX+1];
+ struct nft_stats __percpu *newstats;
+ struct nft_stats *stats;
+ int err;
+
+ err = nla_parse_nested(tb, NFTA_COUNTER_MAX, attr, nft_counter_policy);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFTA_COUNTER_BYTES] || !tb[NFTA_COUNTER_PACKETS])
+ return -EINVAL;
+
+ newstats = alloc_percpu(struct nft_stats);
+ if (newstats == NULL)
+ return -ENOMEM;
+
+ /* Restore old counters on this cpu, no problem. Per-cpu statistics
+ * are not exposed to userspace.
+ */
+ stats = this_cpu_ptr(newstats);
+ stats->bytes = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_BYTES]));
+ stats->pkts = be64_to_cpu(nla_get_be64(tb[NFTA_COUNTER_PACKETS]));
+
+ if (chain->stats) {
+ /* nfnl_lock is held, add some nfnl function for this, later */
+ struct nft_stats __percpu *oldstats =
+ rcu_dereference_protected(chain->stats, 1);
+
+ rcu_assign_pointer(chain->stats, newstats);
+ synchronize_rcu();
+ free_percpu(oldstats);
+ } else
+ rcu_assign_pointer(chain->stats, newstats);
+
+ return 0;
+}
+
static int nf_tables_newchain(struct sock *nlsk, struct sk_buff *skb,
const struct nlmsghdr *nlh,
const struct nlattr * const nla[])
const struct nft_af_info *afi;
struct nft_table *table;
struct nft_chain *chain;
- struct nft_base_chain *basechain;
+ struct nft_base_chain *basechain = NULL;
struct nlattr *ha[NFTA_HOOK_MAX + 1];
int family = nfmsg->nfgen_family;
u64 handle = 0;
!IS_ERR(nf_tables_chain_lookup(table, nla[NFTA_CHAIN_NAME])))
return -EEXIST;
+ if (nla[NFTA_CHAIN_POLICY]) {
+ if (!(chain->flags & NFT_BASE_CHAIN))
+ return -EOPNOTSUPP;
+
+ err = nf_tables_chain_policy(nft_base_chain(chain),
+ nla[NFTA_CHAIN_POLICY]);
+ if (err < 0)
+ return err;
+ }
+
+ if (nla[NFTA_CHAIN_COUNTERS]) {
+ if (!(chain->flags & NFT_BASE_CHAIN))
+ return -EOPNOTSUPP;
+
+ err = nf_tables_counters(nft_base_chain(chain),
+ nla[NFTA_CHAIN_COUNTERS]);
+ if (err < 0)
+ return err;
+ }
+
if (nla[NFTA_CHAIN_HANDLE] && name)
nla_strlcpy(chain->name, name, NFT_CHAIN_MAXNAMELEN);
ops->hook = afi->hooks[ops->hooknum];
chain->flags |= NFT_BASE_CHAIN;
+
+ if (nla[NFTA_CHAIN_POLICY]) {
+ err = nf_tables_chain_policy(basechain,
+ nla[NFTA_CHAIN_POLICY]);
+ if (err < 0) {
+ free_percpu(basechain->stats);
+ kfree(basechain);
+ return err;
+ }
+ } else
+ basechain->policy = NF_ACCEPT;
+
+ if (nla[NFTA_CHAIN_COUNTERS]) {
+ err = nf_tables_counters(basechain,
+ nla[NFTA_CHAIN_COUNTERS]);
+ if (err < 0) {
+ free_percpu(basechain->stats);
+ kfree(basechain);
+ return err;
+ }
+ } else {
+ struct nft_stats __percpu *newstats;
+
+ newstats = alloc_percpu(struct nft_stats);
+ if (newstats == NULL)
+ return -ENOMEM;
+
+ rcu_assign_pointer(nft_base_chain(chain)->stats,
+ newstats);
+ }
} else {
chain = kzalloc(sizeof(*chain), GFP_KERNEL);
if (chain == NULL)
list_add_tail(&chain->list, &table->chains);
table->use++;
+
+ if (chain->flags & NFT_BASE_CHAIN) {
+ err = nf_register_hook(&nft_base_chain(chain)->ops);
+ if (err < 0) {
+ free_percpu(basechain->stats);
+ kfree(basechain);
+ return err;
+ }
+ }
notify:
nf_tables_chain_notify(skb, nlh, table, chain, NFT_MSG_NEWCHAIN,
family);
BUG_ON(chain->use > 0);
- if (chain->flags & NFT_BASE_CHAIN)
+ if (chain->flags & NFT_BASE_CHAIN) {
+ free_percpu(nft_base_chain(chain)->stats);
kfree(nft_base_chain(chain));
- else
+ } else
kfree(chain);
}
const struct nlmsghdr *nlh,
const struct nft_af_info *afi,
const struct nft_table *table,
- const struct nft_chain *chain)
+ const struct nft_chain *chain,
+ const struct nlattr * const *nla)
{
ctx->skb = skb;
ctx->nlh = nlh;
ctx->afi = afi;
ctx->table = table;
ctx->chain = chain;
+ ctx->nla = nla;
}
/*
struct nlattr *tb[NFT_EXPR_MAXATTR + 1];
};
-static int nf_tables_expr_parse(const struct nlattr *nla,
+static int nf_tables_expr_parse(const struct nft_ctx *ctx,
+ const struct nlattr *nla,
struct nft_expr_info *info)
{
const struct nft_expr_type *type;
memset(info->tb, 0, sizeof(info->tb[0]) * (type->maxattr + 1));
if (type->select_ops != NULL) {
- ops = type->select_ops((const struct nlattr * const *)info->tb);
+ ops = type->select_ops(ctx,
+ (const struct nlattr * const *)info->tb);
if (IS_ERR(ops)) {
err = PTR_ERR(ops);
goto err1;
.len = NFT_CHAIN_MAXNAMELEN - 1 },
[NFTA_RULE_HANDLE] = { .type = NLA_U64 },
[NFTA_RULE_EXPRESSIONS] = { .type = NLA_NESTED },
+ [NFTA_RULE_COMPAT] = { .type = NLA_NESTED },
};
static int nf_tables_fill_rule_info(struct sk_buff *skb, u32 portid, u32 seq,
handle = nf_tables_alloc_handle(table);
}
+ nft_ctx_init(&ctx, skb, nlh, afi, table, chain, nla);
+
n = 0;
size = 0;
if (nla[NFTA_RULE_EXPRESSIONS]) {
goto err1;
if (n == NFT_RULE_MAXEXPRS)
goto err1;
- err = nf_tables_expr_parse(tmp, &info[n]);
+ err = nf_tables_expr_parse(&ctx, tmp, &info[n]);
if (err < 0)
goto err1;
size += info[n].ops->size;
rule->handle = handle;
rule->dlen = size;
- nft_ctx_init(&ctx, skb, nlh, afi, table, chain);
expr = nft_expr_first(rule);
for (i = 0; i < n; i++) {
err = nf_tables_newexpr(&ctx, &info[i], expr);
expr = nft_expr_next(expr);
}
- /* Register hook when first rule is inserted into a base chain */
- if (list_empty(&chain->rules) && chain->flags & NFT_BASE_CHAIN) {
- err = nf_register_hook(&nft_base_chain(chain)->ops);
- if (err < 0)
- goto err2;
- }
-
if (nlh->nlmsg_flags & NLM_F_REPLACE) {
list_replace_rcu(&old_rule->list, &rule->list);
nf_tables_rule_destroy(old_rule);
}
}
- /* Unregister hook when last rule from base chain is deleted */
- if (list_empty(&chain->rules) && chain->flags & NFT_BASE_CHAIN)
- nf_unregister_hook(&nft_base_chain(chain)->ops);
-
return 0;
}
return PTR_ERR(table);
}
- nft_ctx_init(ctx, skb, nlh, afi, table, NULL);
+ nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
return 0;
}
if (IS_ERR(table))
return PTR_ERR(table);
- nft_ctx_init(&ctx, skb, nlh, afi, table, NULL);
+ nft_ctx_init(&ctx, skb, nlh, afi, table, NULL, nla);
set = nf_tables_set_lookup(table, nla[NFTA_SET_NAME]);
if (IS_ERR(set)) {
if (IS_ERR(table))
return PTR_ERR(table);
- nft_ctx_init(ctx, skb, nlh, afi, table, NULL);
+ nft_ctx_init(ctx, skb, nlh, afi, table, NULL, nla);
return 0;
}
{
const struct nft_rule *rule;
const struct nft_expr *expr, *last;
- const struct nft_data *data;
const struct nft_set *set;
struct nft_set_binding *binding;
struct nft_set_iter iter;
- int err;
if (ctx->chain == chain)
return -ELOOP;
list_for_each_entry(rule, &chain->rules, list) {
nft_rule_for_each_expr(expr, last, rule) {
- if (!expr->ops->get_verdict)
+ const struct nft_data *data = NULL;
+ int err;
+
+ if (!expr->ops->validate)
continue;
- data = expr->ops->get_verdict(expr);
+ err = expr->ops->validate(ctx, expr, &data);
+ if (err < 0)
+ return err;
+
if (data == NULL)
- break;
+ continue;
switch (data->verdict) {
case NFT_JUMP:
return true;
}
-unsigned int nft_do_chain(const struct nf_hook_ops *ops,
- struct sk_buff *skb,
- const struct net_device *in,
- const struct net_device *out,
- int (*okfn)(struct sk_buff *))
+struct nft_jumpstack {
+ const struct nft_chain *chain;
+ const struct nft_rule *rule;
+};
+
+static inline void
+nft_chain_stats(const struct nft_chain *this, const struct nft_pktinfo *pkt,
+ struct nft_jumpstack *jumpstack, unsigned int stackptr)
+{
+ struct nft_stats __percpu *stats;
+ const struct nft_chain *chain = stackptr ? jumpstack[0].chain : this;
+
+ rcu_read_lock_bh();
+ stats = rcu_dereference(nft_base_chain(chain)->stats);
+ __this_cpu_inc(stats->pkts);
+ __this_cpu_add(stats->bytes, pkt->skb->len);
+ rcu_read_unlock_bh();
+}
+
+unsigned int
+nft_do_chain_pktinfo(struct nft_pktinfo *pkt, const struct nf_hook_ops *ops)
{
const struct nft_chain *chain = ops->priv;
const struct nft_rule *rule;
const struct nft_expr *expr, *last;
struct nft_data data[NFT_REG_MAX + 1];
- const struct nft_pktinfo pkt = {
- .skb = skb,
- .in = in,
- .out = out,
- .hooknum = ops->hooknum,
- };
unsigned int stackptr = 0;
- struct {
- const struct nft_chain *chain;
- const struct nft_rule *rule;
- } jumpstack[NFT_JUMP_STACK_SIZE];
+ struct nft_jumpstack jumpstack[NFT_JUMP_STACK_SIZE];
do_chain:
rule = list_entry(&chain->rules, struct nft_rule, list);
if (expr->ops == &nft_cmp_fast_ops)
nft_cmp_fast_eval(expr, data);
else if (expr->ops != &nft_payload_fast_ops ||
- !nft_payload_fast_eval(expr, data, &pkt))
- expr->ops->eval(expr, data, &pkt);
+ !nft_payload_fast_eval(expr, data, pkt))
+ expr->ops->eval(expr, data, pkt);
if (data[NFT_REG_VERDICT].verdict != NFT_CONTINUE)
break;
rule = jumpstack[stackptr].rule;
goto next_rule;
}
+ nft_chain_stats(chain, pkt, jumpstack, stackptr);
- return NF_ACCEPT;
+ return nft_base_chain(chain)->policy;
}
-EXPORT_SYMBOL_GPL(nft_do_chain);
+EXPORT_SYMBOL_GPL(nft_do_chain_pktinfo);
int __init nf_tables_core_module_init(void)
{
.dump = nft_cmp_fast_dump,
};
-static const struct nft_expr_ops *nft_cmp_select_ops(const struct nlattr * const tb[])
+static const struct nft_expr_ops *
+nft_cmp_select_ops(const struct nft_ctx *ctx, const struct nlattr * const tb[])
{
struct nft_data_desc desc;
struct nft_data data;
--- /dev/null
+/*
+ * (C) 2012-2013 by 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.
+ *
+ * This software has been sponsored by Sophos Astaro <http://www.sophos.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/netlink.h>
+#include <linux/netfilter.h>
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nf_tables.h>
+#include <linux/netfilter/nf_tables_compat.h>
+#include <linux/netfilter/x_tables.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <asm/uaccess.h> /* for set_fs */
+#include <net/netfilter/nf_tables.h>
+
+union nft_entry {
+ struct ipt_entry e4;
+ struct ip6t_entry e6;
+};
+
+static inline void
+nft_compat_set_par(struct xt_action_param *par, void *xt, const void *xt_info)
+{
+ par->target = xt;
+ par->targinfo = xt_info;
+ par->hotdrop = false;
+}
+
+static void nft_target_eval(const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1],
+ const struct nft_pktinfo *pkt)
+{
+ void *info = nft_expr_priv(expr);
+ struct xt_target *target = expr->ops->data;
+ struct sk_buff *skb = pkt->skb;
+ int ret;
+
+ nft_compat_set_par((struct xt_action_param *)&pkt->xt, target, info);
+
+ ret = target->target(skb, &pkt->xt);
+
+ if (pkt->xt.hotdrop)
+ ret = NF_DROP;
+
+ switch(ret) {
+ case XT_CONTINUE:
+ data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
+ break;
+ default:
+ data[NFT_REG_VERDICT].verdict = ret;
+ break;
+ }
+ return;
+}
+
+static const struct nla_policy nft_target_policy[NFTA_TARGET_MAX + 1] = {
+ [NFTA_TARGET_NAME] = { .type = NLA_NUL_STRING },
+ [NFTA_TARGET_REV] = { .type = NLA_U32 },
+ [NFTA_TARGET_INFO] = { .type = NLA_BINARY },
+};
+
+static void
+nft_target_set_tgchk_param(struct xt_tgchk_param *par,
+ const struct nft_ctx *ctx,
+ struct xt_target *target, void *info,
+ union nft_entry *entry, u8 proto, bool inv)
+{
+ par->net = &init_net;
+ par->table = ctx->table->name;
+ switch (ctx->afi->family) {
+ case AF_INET:
+ entry->e4.ip.proto = proto;
+ entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
+ break;
+ case AF_INET6:
+ entry->e6.ipv6.proto = proto;
+ entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
+ break;
+ }
+ par->entryinfo = entry;
+ par->target = target;
+ par->targinfo = info;
+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
+ const struct nft_base_chain *basechain =
+ nft_base_chain(ctx->chain);
+ const struct nf_hook_ops *ops = &basechain->ops;
+
+ par->hook_mask = 1 << ops->hooknum;
+ }
+ par->family = ctx->afi->family;
+}
+
+static void target_compat_from_user(struct xt_target *t, void *in, void *out)
+{
+#ifdef CONFIG_COMPAT
+ if (t->compat_from_user) {
+ int pad;
+
+ t->compat_from_user(out, in);
+ pad = XT_ALIGN(t->targetsize) - t->targetsize;
+ if (pad > 0)
+ memset(out + t->targetsize, 0, pad);
+ } else
+#endif
+ memcpy(out, in, XT_ALIGN(t->targetsize));
+}
+
+static inline int nft_compat_target_offset(struct xt_target *target)
+{
+#ifdef CONFIG_COMPAT
+ return xt_compat_target_offset(target);
+#else
+ return 0;
+#endif
+}
+
+static const struct nla_policy nft_rule_compat_policy[NFTA_RULE_COMPAT_MAX + 1] = {
+ [NFTA_RULE_COMPAT_PROTO] = { .type = NLA_U32 },
+ [NFTA_RULE_COMPAT_FLAGS] = { .type = NLA_U32 },
+};
+
+static u8 nft_parse_compat(const struct nlattr *attr, bool *inv)
+{
+ struct nlattr *tb[NFTA_RULE_COMPAT_MAX+1];
+ u32 flags;
+ int err;
+
+ err = nla_parse_nested(tb, NFTA_RULE_COMPAT_MAX, attr,
+ nft_rule_compat_policy);
+ if (err < 0)
+ return err;
+
+ if (!tb[NFTA_RULE_COMPAT_PROTO] || !tb[NFTA_RULE_COMPAT_FLAGS])
+ return -EINVAL;
+
+ flags = ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_FLAGS]));
+ if (flags & ~NFT_RULE_COMPAT_F_MASK)
+ return -EINVAL;
+ if (flags & NFT_RULE_COMPAT_F_INV)
+ *inv = true;
+
+ return ntohl(nla_get_be32(tb[NFTA_RULE_COMPAT_PROTO]));
+}
+
+static int
+nft_target_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ void *info = nft_expr_priv(expr);
+ struct xt_target *target = expr->ops->data;
+ struct xt_tgchk_param par;
+ size_t size = XT_ALIGN(nla_len(tb[NFTA_TARGET_INFO]));
+ u8 proto = 0;
+ bool inv = false;
+ union nft_entry e = {};
+ int ret;
+
+ target_compat_from_user(target, nla_data(tb[NFTA_TARGET_INFO]), info);
+
+ if (ctx->nla[NFTA_RULE_COMPAT])
+ proto = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &inv);
+
+ nft_target_set_tgchk_param(&par, ctx, target, info, &e, proto, inv);
+
+ ret = xt_check_target(&par, size, proto, inv);
+ if (ret < 0)
+ goto err;
+
+ /* The standard target cannot be used */
+ if (target->target == NULL) {
+ ret = -EINVAL;
+ goto err;
+ }
+
+ return 0;
+err:
+ module_put(target->me);
+ return ret;
+}
+
+static void
+nft_target_destroy(const struct nft_expr *expr)
+{
+ struct xt_target *target = expr->ops->data;
+
+ module_put(target->me);
+}
+
+static int
+target_dump_info(struct sk_buff *skb, const struct xt_target *t, const void *in)
+{
+ int ret;
+
+#ifdef CONFIG_COMPAT
+ if (t->compat_to_user) {
+ mm_segment_t old_fs;
+ void *out;
+
+ out = kmalloc(XT_ALIGN(t->targetsize), GFP_ATOMIC);
+ if (out == NULL)
+ return -ENOMEM;
+
+ /* We want to reuse existing compat_to_user */
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ t->compat_to_user(out, in);
+ set_fs(old_fs);
+ ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), out);
+ kfree(out);
+ } else
+#endif
+ ret = nla_put(skb, NFTA_TARGET_INFO, XT_ALIGN(t->targetsize), in);
+
+ return ret;
+}
+
+static int nft_target_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+ const struct xt_target *target = expr->ops->data;
+ void *info = nft_expr_priv(expr);
+
+ if (nla_put_string(skb, NFTA_TARGET_NAME, target->name) ||
+ nla_put_be32(skb, NFTA_TARGET_REV, htonl(target->revision)) ||
+ target_dump_info(skb, target, info))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+static int nft_target_validate(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nft_data **data)
+{
+ struct xt_target *target = expr->ops->data;
+ unsigned int hook_mask = 0;
+
+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
+ const struct nft_base_chain *basechain =
+ nft_base_chain(ctx->chain);
+ const struct nf_hook_ops *ops = &basechain->ops;
+
+ hook_mask = 1 << ops->hooknum;
+ if (hook_mask & target->hooks)
+ return 0;
+
+ /* This target is being called from an invalid chain */
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void nft_match_eval(const struct nft_expr *expr,
+ struct nft_data data[NFT_REG_MAX + 1],
+ const struct nft_pktinfo *pkt)
+{
+ void *info = nft_expr_priv(expr);
+ struct xt_match *match = expr->ops->data;
+ struct sk_buff *skb = pkt->skb;
+ bool ret;
+
+ nft_compat_set_par((struct xt_action_param *)&pkt->xt, match, info);
+
+ ret = match->match(skb, (struct xt_action_param *)&pkt->xt);
+
+ if (pkt->xt.hotdrop) {
+ data[NFT_REG_VERDICT].verdict = NF_DROP;
+ return;
+ }
+
+ switch(ret) {
+ case true:
+ data[NFT_REG_VERDICT].verdict = NFT_CONTINUE;
+ break;
+ case false:
+ data[NFT_REG_VERDICT].verdict = NFT_BREAK;
+ break;
+ }
+}
+
+static const struct nla_policy nft_match_policy[NFTA_MATCH_MAX + 1] = {
+ [NFTA_MATCH_NAME] = { .type = NLA_NUL_STRING },
+ [NFTA_MATCH_REV] = { .type = NLA_U32 },
+ [NFTA_MATCH_INFO] = { .type = NLA_BINARY },
+};
+
+/* struct xt_mtchk_param and xt_tgchk_param look very similar */
+static void
+nft_match_set_mtchk_param(struct xt_mtchk_param *par, const struct nft_ctx *ctx,
+ struct xt_match *match, void *info,
+ union nft_entry *entry, u8 proto, bool inv)
+{
+ par->net = &init_net;
+ par->table = ctx->table->name;
+ switch (ctx->afi->family) {
+ case AF_INET:
+ entry->e4.ip.proto = proto;
+ entry->e4.ip.invflags = inv ? IPT_INV_PROTO : 0;
+ break;
+ case AF_INET6:
+ entry->e6.ipv6.proto = proto;
+ entry->e6.ipv6.invflags = inv ? IP6T_INV_PROTO : 0;
+ break;
+ }
+ par->entryinfo = entry;
+ par->match = match;
+ par->matchinfo = info;
+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
+ const struct nft_base_chain *basechain =
+ nft_base_chain(ctx->chain);
+ const struct nf_hook_ops *ops = &basechain->ops;
+
+ par->hook_mask = 1 << ops->hooknum;
+ }
+ par->family = ctx->afi->family;
+}
+
+static void match_compat_from_user(struct xt_match *m, void *in, void *out)
+{
+#ifdef CONFIG_COMPAT
+ if (m->compat_from_user) {
+ int pad;
+
+ m->compat_from_user(out, in);
+ pad = XT_ALIGN(m->matchsize) - m->matchsize;
+ if (pad > 0)
+ memset(out + m->matchsize, 0, pad);
+ } else
+#endif
+ memcpy(out, in, XT_ALIGN(m->matchsize));
+}
+
+static int
+nft_match_init(const struct nft_ctx *ctx, const struct nft_expr *expr,
+ const struct nlattr * const tb[])
+{
+ void *info = nft_expr_priv(expr);
+ struct xt_match *match = expr->ops->data;
+ struct xt_mtchk_param par;
+ size_t size = XT_ALIGN(nla_len(tb[NFTA_MATCH_INFO]));
+ u8 proto = 0;
+ bool inv = false;
+ union nft_entry e = {};
+ int ret;
+
+ match_compat_from_user(match, nla_data(tb[NFTA_MATCH_INFO]), info);
+
+ if (ctx->nla[NFTA_RULE_COMPAT])
+ proto = nft_parse_compat(ctx->nla[NFTA_RULE_COMPAT], &inv);
+
+ nft_match_set_mtchk_param(&par, ctx, match, info, &e, proto, inv);
+
+ ret = xt_check_match(&par, size, proto, inv);
+ if (ret < 0)
+ goto err;
+
+ return 0;
+err:
+ module_put(match->me);
+ return ret;
+}
+
+static void
+nft_match_destroy(const struct nft_expr *expr)
+{
+ struct xt_match *match = expr->ops->data;
+
+ module_put(match->me);
+}
+
+static int
+match_dump_info(struct sk_buff *skb, const struct xt_match *m, const void *in)
+{
+ int ret;
+
+#ifdef CONFIG_COMPAT
+ if (m->compat_to_user) {
+ mm_segment_t old_fs;
+ void *out;
+
+ out = kmalloc(XT_ALIGN(m->matchsize), GFP_ATOMIC);
+ if (out == NULL)
+ return -ENOMEM;
+
+ /* We want to reuse existing compat_to_user */
+ old_fs = get_fs();
+ set_fs(KERNEL_DS);
+ m->compat_to_user(out, in);
+ set_fs(old_fs);
+ ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), out);
+ kfree(out);
+ } else
+#endif
+ ret = nla_put(skb, NFTA_MATCH_INFO, XT_ALIGN(m->matchsize), in);
+
+ return ret;
+}
+
+static inline int nft_compat_match_offset(struct xt_match *match)
+{
+#ifdef CONFIG_COMPAT
+ return xt_compat_match_offset(match);
+#else
+ return 0;
+#endif
+}
+
+static int nft_match_dump(struct sk_buff *skb, const struct nft_expr *expr)
+{
+ void *info = nft_expr_priv(expr);
+ struct xt_match *match = expr->ops->data;
+
+ if (nla_put_string(skb, NFTA_MATCH_NAME, match->name) ||
+ nla_put_be32(skb, NFTA_MATCH_REV, htonl(match->revision)) ||
+ match_dump_info(skb, match, info))
+ goto nla_put_failure;
+
+ return 0;
+
+nla_put_failure:
+ return -1;
+}
+
+static int nft_match_validate(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nft_data **data)
+{
+ struct xt_match *match = expr->ops->data;
+ unsigned int hook_mask = 0;
+
+ if (ctx->chain->flags & NFT_BASE_CHAIN) {
+ const struct nft_base_chain *basechain =
+ nft_base_chain(ctx->chain);
+ const struct nf_hook_ops *ops = &basechain->ops;
+
+ hook_mask = 1 << ops->hooknum;
+ if (hook_mask & match->hooks)
+ return 0;
+
+ /* This match is being called from an invalid chain */
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int
+nfnl_compat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
+ int event, u16 family, const char *name,
+ int rev, int target)
+{
+ struct nlmsghdr *nlh;
+ struct nfgenmsg *nfmsg;
+ unsigned int flags = portid ? NLM_F_MULTI : 0;
+
+ event |= NFNL_SUBSYS_NFT_COMPAT << 8;
+ nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
+ if (nlh == NULL)
+ goto nlmsg_failure;
+
+ nfmsg = nlmsg_data(nlh);
+ nfmsg->nfgen_family = family;
+ nfmsg->version = NFNETLINK_V0;
+ nfmsg->res_id = 0;
+
+ if (nla_put_string(skb, NFTA_COMPAT_NAME, name) ||
+ nla_put_be32(skb, NFTA_COMPAT_REV, htonl(rev)) ||
+ nla_put_be32(skb, NFTA_COMPAT_TYPE, htonl(target)))
+ goto nla_put_failure;
+
+ nlmsg_end(skb, nlh);
+ return skb->len;
+
+nlmsg_failure:
+nla_put_failure:
+ nlmsg_cancel(skb, nlh);
+ return -1;
+}
+
+static int
+nfnl_compat_get(struct sock *nfnl, struct sk_buff *skb,
+ const struct nlmsghdr *nlh, const struct nlattr * const tb[])
+{
+ int ret = 0, target;
+ struct nfgenmsg *nfmsg;
+ const char *fmt;
+ const char *name;
+ u32 rev;
+ struct sk_buff *skb2;
+
+ if (tb[NFTA_COMPAT_NAME] == NULL ||
+ tb[NFTA_COMPAT_REV] == NULL ||
+ tb[NFTA_COMPAT_TYPE] == NULL)
+ return -EINVAL;
+
+ name = nla_data(tb[NFTA_COMPAT_NAME]);
+ rev = ntohl(nla_get_be32(tb[NFTA_COMPAT_REV]));
+ target = ntohl(nla_get_be32(tb[NFTA_COMPAT_TYPE]));
+
+ nfmsg = nlmsg_data(nlh);
+
+ switch(nfmsg->nfgen_family) {
+ case AF_INET:
+ fmt = "ipt_%s";
+ break;
+ case AF_INET6:
+ fmt = "ip6t_%s";
+ break;
+ default:
+ pr_err("nft_compat: unsupported protocol %d\n",
+ nfmsg->nfgen_family);
+ return -EINVAL;
+ }
+
+ try_then_request_module(xt_find_revision(nfmsg->nfgen_family, name,
+ rev, target, &ret),
+ fmt, name);
+
+ if (ret < 0)
+ return ret;
+
+ skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (skb2 == NULL)
+ return -ENOMEM;
+
+ /* include the best revision for this extension in the message */
+ if (nfnl_compat_fill_info(skb2, NETLINK_CB(skb).portid,
+ nlh->nlmsg_seq,
+ NFNL_MSG_TYPE(nlh->nlmsg_type),
+ NFNL_MSG_COMPAT_GET,
+ nfmsg->nfgen_family,
+ name, ret, target) <= 0) {
+ kfree_skb(skb2);
+ return -ENOSPC;
+ }
+
+ ret = netlink_unicast(nfnl, skb2, NETLINK_CB(skb).portid,
+ MSG_DONTWAIT);
+ if (ret > 0)
+ ret = 0;
+
+ return ret == -EAGAIN ? -ENOBUFS : ret;
+}
+
+static const struct nla_policy nfnl_compat_policy_get[NFTA_COMPAT_MAX+1] = {
+ [NFTA_COMPAT_NAME] = { .type = NLA_NUL_STRING,
+ .len = NFT_COMPAT_NAME_MAX-1 },
+ [NFTA_COMPAT_REV] = { .type = NLA_U32 },
+ [NFTA_COMPAT_TYPE] = { .type = NLA_U32 },
+};
+
+static const struct nfnl_callback nfnl_nft_compat_cb[NFNL_MSG_COMPAT_MAX] = {
+ [NFNL_MSG_COMPAT_GET] = { .call = nfnl_compat_get,
+ .attr_count = NFTA_COMPAT_MAX,
+ .policy = nfnl_compat_policy_get },
+};
+
+static const struct nfnetlink_subsystem nfnl_compat_subsys = {
+ .name = "nft-compat",
+ .subsys_id = NFNL_SUBSYS_NFT_COMPAT,
+ .cb_count = NFNL_MSG_COMPAT_MAX,
+ .cb = nfnl_nft_compat_cb,
+};
+
+static LIST_HEAD(nft_match_list);
+
+struct nft_xt {
+ struct list_head head;
+ struct nft_expr_ops ops;
+};
+
+static struct nft_expr_type nft_match_type;
+
+static const struct nft_expr_ops *
+nft_match_select_ops(const struct nft_ctx *ctx,
+ const struct nlattr * const tb[])
+{
+ struct nft_xt *nft_match;
+ struct xt_match *match;
+ char *mt_name;
+ __u32 rev, family;
+
+ if (tb[NFTA_MATCH_NAME] == NULL ||
+ tb[NFTA_MATCH_REV] == NULL ||
+ tb[NFTA_MATCH_INFO] == NULL)
+ return ERR_PTR(-EINVAL);
+
+ mt_name = nla_data(tb[NFTA_MATCH_NAME]);
+ rev = ntohl(nla_get_be32(tb[NFTA_MATCH_REV]));
+ family = ctx->afi->family;
+
+ /* Re-use the existing match if it's already loaded. */
+ list_for_each_entry(nft_match, &nft_match_list, head) {
+ struct xt_match *match = nft_match->ops.data;
+
+ if (strcmp(match->name, mt_name) == 0 &&
+ match->revision == rev && match->family == family)
+ return &nft_match->ops;
+ }
+
+ match = xt_request_find_match(family, mt_name, rev);
+ if (IS_ERR(match))
+ return ERR_PTR(-ENOENT);
+
+ /* This is the first time we use this match, allocate operations */
+ nft_match = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
+ if (nft_match == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ nft_match->ops.type = &nft_match_type;
+ nft_match->ops.size = NFT_EXPR_SIZE(XT_ALIGN(match->matchsize) +
+ nft_compat_match_offset(match));
+ nft_match->ops.eval = nft_match_eval;
+ nft_match->ops.init = nft_match_init;
+ nft_match->ops.destroy = nft_match_destroy;
+ nft_match->ops.dump = nft_match_dump;
+ nft_match->ops.validate = nft_match_validate;
+ nft_match->ops.data = match;
+
+ list_add(&nft_match->head, &nft_match_list);
+
+ return &nft_match->ops;
+}
+
+static void nft_match_release(void)
+{
+ struct nft_xt *nft_match;
+
+ list_for_each_entry(nft_match, &nft_match_list, head)
+ kfree(nft_match);
+}
+
+static struct nft_expr_type nft_match_type __read_mostly = {
+ .name = "match",
+ .select_ops = nft_match_select_ops,
+ .policy = nft_match_policy,
+ .maxattr = NFTA_MATCH_MAX,
+ .owner = THIS_MODULE,
+};
+
+static LIST_HEAD(nft_target_list);
+
+static struct nft_expr_type nft_target_type;
+
+static const struct nft_expr_ops *
+nft_target_select_ops(const struct nft_ctx *ctx,
+ const struct nlattr * const tb[])
+{
+ struct nft_xt *nft_target;
+ struct xt_target *target;
+ char *tg_name;
+ __u32 rev, family;
+
+ if (tb[NFTA_TARGET_NAME] == NULL ||
+ tb[NFTA_TARGET_REV] == NULL ||
+ tb[NFTA_TARGET_INFO] == NULL)
+ return ERR_PTR(-EINVAL);
+
+ tg_name = nla_data(tb[NFTA_TARGET_NAME]);
+ rev = ntohl(nla_get_be32(tb[NFTA_TARGET_REV]));
+ family = ctx->afi->family;
+
+ /* Re-use the existing target if it's already loaded. */
+ list_for_each_entry(nft_target, &nft_match_list, head) {
+ struct xt_target *target = nft_target->ops.data;
+
+ if (strcmp(target->name, tg_name) == 0 &&
+ target->revision == rev && target->family == family)
+ return &nft_target->ops;
+ }
+
+ target = xt_request_find_target(family, tg_name, rev);
+ if (IS_ERR(target))
+ return ERR_PTR(-ENOENT);
+
+ /* This is the first time we use this target, allocate operations */
+ nft_target = kzalloc(sizeof(struct nft_xt), GFP_KERNEL);
+ if (nft_target == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ nft_target->ops.type = &nft_target_type;
+ nft_target->ops.size = NFT_EXPR_SIZE(XT_ALIGN(target->targetsize) +
+ nft_compat_target_offset(target));
+ nft_target->ops.eval = nft_target_eval;
+ nft_target->ops.init = nft_target_init;
+ nft_target->ops.destroy = nft_target_destroy;
+ nft_target->ops.dump = nft_target_dump;
+ nft_target->ops.validate = nft_target_validate;
+ nft_target->ops.data = target;
+
+ list_add(&nft_target->head, &nft_target_list);
+
+ return &nft_target->ops;
+}
+
+static void nft_target_release(void)
+{
+ struct nft_xt *nft_target;
+
+ list_for_each_entry(nft_target, &nft_target_list, head)
+ kfree(nft_target);
+}
+
+static struct nft_expr_type nft_target_type __read_mostly = {
+ .name = "target",
+ .select_ops = nft_target_select_ops,
+ .policy = nft_target_policy,
+ .maxattr = NFTA_TARGET_MAX,
+ .owner = THIS_MODULE,
+};
+
+static int __init nft_compat_module_init(void)
+{
+ int ret;
+
+ ret = nft_register_expr(&nft_match_type);
+ if (ret < 0)
+ return ret;
+
+ ret = nft_register_expr(&nft_target_type);
+ if (ret < 0)
+ goto err_match;
+
+ ret = nfnetlink_subsys_register(&nfnl_compat_subsys);
+ if (ret < 0) {
+ pr_err("nft_compat: cannot register with nfnetlink.\n");
+ goto err_target;
+ }
+
+ pr_info("nf_tables_compat: (c) 2012 Pablo Neira Ayuso <pablo@netfilter.org>\n");
+
+ return ret;
+
+err_target:
+ nft_unregister_expr(&nft_target_type);
+err_match:
+ nft_unregister_expr(&nft_match_type);
+ return ret;
+}
+
+static void __exit nft_compat_module_exit(void)
+{
+ nfnetlink_subsys_unregister(&nfnl_compat_subsys);
+ nft_unregister_expr(&nft_target_type);
+ nft_unregister_expr(&nft_match_type);
+ nft_match_release();
+ nft_target_release();
+}
+
+MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_NFT_COMPAT);
+
+module_init(nft_compat_module_init);
+module_exit(nft_compat_module_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Pablo Neira Ayuso <pablo@netfilter.org>");
+MODULE_ALIAS_NFT_EXPR("match");
+MODULE_ALIAS_NFT_EXPR("target");
return -1;
}
-static const struct nft_data *nft_immediate_get_verdict(const struct nft_expr *expr)
+static int nft_immediate_validate(const struct nft_ctx *ctx,
+ const struct nft_expr *expr,
+ const struct nft_data **data)
{
const struct nft_immediate_expr *priv = nft_expr_priv(expr);
if (priv->dreg == NFT_REG_VERDICT)
- return &priv->data;
- else
- return NULL;
+ *data = &priv->data;
+
+ return 0;
}
static struct nft_expr_type nft_imm_type;
.init = nft_immediate_init,
.destroy = nft_immediate_destroy,
.dump = nft_immediate_dump,
- .get_verdict = nft_immediate_get_verdict,
+ .validate = nft_immediate_validate,
};
static struct nft_expr_type nft_imm_type __read_mostly = {
.dump = nft_payload_dump,
};
-static const struct nft_expr_ops *nft_payload_select_ops(const struct nlattr * const tb[])
+static const struct nft_expr_ops *
+nft_payload_select_ops(const struct nft_ctx *ctx,
+ const struct nlattr * const tb[])
{
enum nft_payload_bases base;
unsigned int offset, len;
projects / cascardo / linux.git / commitdiff