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Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next

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Pablo Neira Ayuso says:

====================
Netfilter updates for net-next

The following patchset contains Netfilter updates for net-next, they are:

1) default CONFIG_NETFILTER_INGRESS to y for easier compile-testing of all
   options.

2) Allow to bind a table to net_device. This introduces the internal
   NFT_AF_NEEDS_DEV flag to perform a mandatory check for this binding.
   This is required by the next patch.

3) Add the 'netdev' table family, this new table allows you to create ingress
   filter basechains. This provides access to the existing nf_tables features
   from ingress.

4) Kill unused argument from compat_find_calc_{match,target} in ip_tables
   and ip6_tables, from Florian Westphal.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-05-31 00:02:30 -07:00
commit 583d3f5af2
9 changed files with 244 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
include/net/netfilter/nf_tables.h
View File

@ -819,6 +819,7 @@ unsigned int nft_do_chain(struct nft_pktinfo *pkt,
* @use: number of chain references to this table
* @flags: table flag (see enum nft_table_flags)
* @name: name of the table
* @dev: this table is bound to this device (if any)
*/
struct nft_table {
struct list_head list;
@ -828,6 +829,11 @@ struct nft_table {
u32 use;
u16 flags;
char name[NFT_TABLE_MAXNAMELEN];
struct net_device *dev;
};
enum nft_af_flags {
NFT_AF_NEEDS_DEV = (1 << 0),
};
/**
@ -838,6 +844,7 @@ struct nft_table {
* @nhooks: number of hooks in this family
* @owner: module owner
* @tables: used internally
* @flags: family flags
* @nops: number of hook ops in this family
* @hook_ops_init: initialization function for chain hook ops
* @hooks: hookfn overrides for packet validation
@ -848,6 +855,7 @@ struct nft_af_info {
unsigned int nhooks;
struct module *owner;
struct list_head tables;
u32 flags;
unsigned int nops;
void (*hook_ops_init)(struct nf_hook_ops *,
unsigned int);

1
include/net/netns/nftables.h
View File

@ -13,6 +13,7 @@ struct netns_nftables {
struct nft_af_info *inet;
struct nft_af_info *arp;
struct nft_af_info *bridge;
struct nft_af_info *netdev;
unsigned int base_seq;
u8 gencursor;
};

2
include/uapi/linux/netfilter/nf_tables.h
View File

@ -146,12 +146,14 @@ enum nft_table_flags {
* @NFTA_TABLE_NAME: name of the table (NLA_STRING)
* @NFTA_TABLE_FLAGS: bitmask of enum nft_table_flags (NLA_U32)
* @NFTA_TABLE_USE: number of chains in this table (NLA_U32)
* @NFTA_TABLE_DEV: net device name (NLA_STRING)
*/
enum nft_table_attributes {
NFTA_TABLE_UNSPEC,
NFTA_TABLE_NAME,
NFTA_TABLE_FLAGS,
NFTA_TABLE_USE,
NFTA_TABLE_DEV,
__NFTA_TABLE_MAX
};
#define NFTA_TABLE_MAX (__NFTA_TABLE_MAX - 1)

4
net/ipv4/netfilter/ip_tables.c
View File

@ -1444,7 +1444,6 @@ static int
compat_find_calc_match(struct xt_entry_match *m,
const char *name,
const struct ipt_ip *ip,
unsigned int hookmask,
int *size)
{
struct xt_match *match;
@ -1513,8 +1512,7 @@ check_compat_entry_size_and_hooks(struct compat_ipt_entry *e,
entry_offset = (void *)e - (void *)base;
j = 0;
xt_ematch_foreach(ematch, e) {
ret = compat_find_calc_match(ematch, name,
&e->ip, e->comefrom, &off);
ret = compat_find_calc_match(ematch, name, &e->ip, &off);
if (ret != 0)
goto release_matches;
++j;

4
net/ipv6/netfilter/ip6_tables.c
View File

@ -1459,7 +1459,6 @@ static int
compat_find_calc_match(struct xt_entry_match *m,
const char *name,
const struct ip6t_ip6 *ipv6,
unsigned int hookmask,
int *size)
{
struct xt_match *match;
@ -1528,8 +1527,7 @@ check_compat_entry_size_and_hooks(struct compat_ip6t_entry *e,
entry_offset = (void *)e - (void *)base;
j = 0;
xt_ematch_foreach(ematch, e) {
ret = compat_find_calc_match(ematch, name,
&e->ipv6, e->comefrom, &off);
ret = compat_find_calc_match(ematch, name, &e->ipv6, &off);
if (ret != 0)
goto release_matches;
++j;

6
net/netfilter/Kconfig
View File

@ -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

1
net/netfilter/Makefile
View File

@ -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

46
net/netfilter/nf_tables_api.c
View File

@ -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)

183
net/netfilter/nf_tables_netdev.c Normal file
View File

@ -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 */