diff options
Diffstat (limited to 'net/ipv4/netfilter')
-rw-r--r-- | net/ipv4/netfilter/Kconfig | 10 | ||||
-rw-r--r-- | net/ipv4/netfilter/Makefile | 5 | ||||
-rw-r--r-- | net/ipv4/netfilter/ip_tables.c | 7 | ||||
-rw-r--r-- | net/ipv4/netfilter/ipt_MASQUERADE.c | 2 | ||||
-rw-r--r-- | net/ipv4/netfilter/iptable_nat.c | 88 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_flow_table_ipv4.c | 255 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_h323.c | 4 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_l3proto_ipv4.c | 143 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_masquerade_ipv4.c | 8 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_pptp.c | 2 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_gre.c | 2 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_nat_proto_icmp.c | 2 | ||||
-rw-r--r-- | net/ipv4/netfilter/nf_tproxy_ipv4.c | 147 | ||||
-rw-r--r-- | net/ipv4/netfilter/nft_chain_nat_ipv4.c | 53 | ||||
-rw-r--r-- | net/ipv4/netfilter/nft_masq_ipv4.c | 2 |
15 files changed, 283 insertions, 447 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig index 280048e1e395..bbfc356cb1b5 100644 --- a/net/ipv4/netfilter/Kconfig +++ b/net/ipv4/netfilter/Kconfig @@ -29,7 +29,10 @@ config NF_SOCKET_IPV4 tristate "IPv4 socket lookup support" help This option enables the IPv4 socket lookup infrastructure. This is - is required by the iptables socket match. + is required by the {ip,nf}tables socket match. + +config NF_TPROXY_IPV4 + tristate "IPv4 tproxy support" if NF_TABLES @@ -129,10 +132,7 @@ config NFT_CHAIN_NAT_IPV4 source and destination ports. config NF_NAT_MASQUERADE_IPV4 - tristate "IPv4 masquerade support" - help - This is the kernel functionality to provide NAT in the masquerade - flavour (automatic source address selection). + bool config NFT_MASQ_IPV4 tristate "IPv4 masquerading support for nf_tables" diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile index 0e5edd0c7926..8394c17c269f 100644 --- a/net/ipv4/netfilter/Makefile +++ b/net/ipv4/netfilter/Makefile @@ -10,12 +10,14 @@ nf_conntrack_ipv4-y := nf_conntrack_l3proto_ipv4.o nf_conntrack_proto_icmp.o obj-$(CONFIG_NF_CONNTRACK_IPV4) += nf_conntrack_ipv4.o nf_nat_ipv4-y := nf_nat_l3proto_ipv4.o nf_nat_proto_icmp.o +nf_nat_ipv4-$(CONFIG_NF_NAT_MASQUERADE_IPV4) += nf_nat_masquerade_ipv4.o obj-$(CONFIG_NF_NAT_IPV4) += nf_nat_ipv4.o # defrag obj-$(CONFIG_NF_DEFRAG_IPV4) += nf_defrag_ipv4.o obj-$(CONFIG_NF_SOCKET_IPV4) += nf_socket_ipv4.o +obj-$(CONFIG_NF_TPROXY_IPV4) += nf_tproxy_ipv4.o # logging obj-$(CONFIG_NF_LOG_ARP) += nf_log_arp.o @@ -32,9 +34,6 @@ nf_nat_snmp_basic-y := nf_nat_snmp_basic.asn1.o nf_nat_snmp_basic_main.o $(obj)/nf_nat_snmp_basic_main.o: $(obj)/nf_nat_snmp_basic.asn1.h obj-$(CONFIG_NF_NAT_SNMP_BASIC) += nf_nat_snmp_basic.o -obj-$(CONFIG_NF_NAT_MASQUERADE_IPV4) += nf_nat_masquerade_ipv4.o - - # NAT protocols (nf_nat) obj-$(CONFIG_NF_NAT_PROTO_GRE) += nf_nat_proto_gre.o diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c index e85f35b89c49..38ab97b0a2ec 100644 --- a/net/ipv4/netfilter/ip_tables.c +++ b/net/ipv4/netfilter/ip_tables.c @@ -301,7 +301,7 @@ ipt_do_table(struct sk_buff *skb, counter = xt_get_this_cpu_counter(&e->counters); ADD_COUNTER(*counter, skb->len, 1); - t = ipt_get_target(e); + t = ipt_get_target_c(e); WARN_ON(!t->u.kernel.target); #if IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TRACE) @@ -1783,6 +1783,8 @@ int ipt_register_table(struct net *net, const struct xt_table *table, /* set res now, will see skbs right after nf_register_net_hooks */ WRITE_ONCE(*res, new_table); + if (!ops) + return 0; ret = nf_register_net_hooks(net, ops, hweight32(table->valid_hooks)); if (ret != 0) { @@ -1800,7 +1802,8 @@ out_free: void ipt_unregister_table(struct net *net, struct xt_table *table, const struct nf_hook_ops *ops) { - nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); + if (ops) + nf_unregister_net_hooks(net, ops, hweight32(table->valid_hooks)); __ipt_unregister_table(net, table); } diff --git a/net/ipv4/netfilter/ipt_MASQUERADE.c b/net/ipv4/netfilter/ipt_MASQUERADE.c index a03e4e7ef5f9..ce1512b02cb2 100644 --- a/net/ipv4/netfilter/ipt_MASQUERADE.c +++ b/net/ipv4/netfilter/ipt_MASQUERADE.c @@ -47,7 +47,7 @@ static int masquerade_tg_check(const struct xt_tgchk_param *par) static unsigned int masquerade_tg(struct sk_buff *skb, const struct xt_action_param *par) { - struct nf_nat_range range; + struct nf_nat_range2 range; const struct nf_nat_ipv4_multi_range_compat *mr; mr = par->targinfo; diff --git a/net/ipv4/netfilter/iptable_nat.c b/net/ipv4/netfilter/iptable_nat.c index 0f7255cc65ee..a317445448bf 100644 --- a/net/ipv4/netfilter/iptable_nat.c +++ b/net/ipv4/netfilter/iptable_nat.c @@ -33,75 +33,63 @@ static const struct xt_table nf_nat_ipv4_table = { static unsigned int iptable_nat_do_chain(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - struct nf_conn *ct) -{ - return ipt_do_table(skb, state, state->net->ipv4.nat_table); -} - -static unsigned int iptable_nat_ipv4_fn(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state) -{ - return nf_nat_ipv4_fn(priv, skb, state, iptable_nat_do_chain); -} - -static unsigned int iptable_nat_ipv4_in(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state) -{ - return nf_nat_ipv4_in(priv, skb, state, iptable_nat_do_chain); -} - -static unsigned int iptable_nat_ipv4_out(void *priv, - struct sk_buff *skb, const struct nf_hook_state *state) { - return nf_nat_ipv4_out(priv, skb, state, iptable_nat_do_chain); -} - -static unsigned int iptable_nat_ipv4_local_fn(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state) -{ - return nf_nat_ipv4_local_fn(priv, skb, state, iptable_nat_do_chain); + return ipt_do_table(skb, state, state->net->ipv4.nat_table); } static const struct nf_hook_ops nf_nat_ipv4_ops[] = { - /* Before packet filtering, change destination */ { - .hook = iptable_nat_ipv4_in, + .hook = iptable_nat_do_chain, .pf = NFPROTO_IPV4, - .nat_hook = true, .hooknum = NF_INET_PRE_ROUTING, .priority = NF_IP_PRI_NAT_DST, }, - /* After packet filtering, change source */ { - .hook = iptable_nat_ipv4_out, + .hook = iptable_nat_do_chain, .pf = NFPROTO_IPV4, - .nat_hook = true, .hooknum = NF_INET_POST_ROUTING, .priority = NF_IP_PRI_NAT_SRC, }, - /* Before packet filtering, change destination */ { - .hook = iptable_nat_ipv4_local_fn, + .hook = iptable_nat_do_chain, .pf = NFPROTO_IPV4, - .nat_hook = true, .hooknum = NF_INET_LOCAL_OUT, .priority = NF_IP_PRI_NAT_DST, }, - /* After packet filtering, change source */ { - .hook = iptable_nat_ipv4_fn, + .hook = iptable_nat_do_chain, .pf = NFPROTO_IPV4, - .nat_hook = true, .hooknum = NF_INET_LOCAL_IN, .priority = NF_IP_PRI_NAT_SRC, }, }; +static int ipt_nat_register_lookups(struct net *net) +{ + int i, ret; + + for (i = 0; i < ARRAY_SIZE(nf_nat_ipv4_ops); i++) { + ret = nf_nat_l3proto_ipv4_register_fn(net, &nf_nat_ipv4_ops[i]); + if (ret) { + while (i) + nf_nat_l3proto_ipv4_unregister_fn(net, &nf_nat_ipv4_ops[--i]); + + return ret; + } + } + + return 0; +} + +static void ipt_nat_unregister_lookups(struct net *net) +{ + int i; + + for (i = 0; i < ARRAY_SIZE(nf_nat_ipv4_ops); i++) + nf_nat_l3proto_ipv4_unregister_fn(net, &nf_nat_ipv4_ops[i]); +} + static int __net_init iptable_nat_table_init(struct net *net) { struct ipt_replace *repl; @@ -114,7 +102,18 @@ static int __net_init iptable_nat_table_init(struct net *net) if (repl == NULL) return -ENOMEM; ret = ipt_register_table(net, &nf_nat_ipv4_table, repl, - nf_nat_ipv4_ops, &net->ipv4.nat_table); + NULL, &net->ipv4.nat_table); + if (ret < 0) { + kfree(repl); + return ret; + } + + ret = ipt_nat_register_lookups(net); + if (ret < 0) { + ipt_unregister_table(net, net->ipv4.nat_table, NULL); + net->ipv4.nat_table = NULL; + } + kfree(repl); return ret; } @@ -123,7 +122,8 @@ static void __net_exit iptable_nat_net_exit(struct net *net) { if (!net->ipv4.nat_table) return; - ipt_unregister_table(net, net->ipv4.nat_table, nf_nat_ipv4_ops); + ipt_nat_unregister_lookups(net); + ipt_unregister_table(net, net->ipv4.nat_table, NULL); net->ipv4.nat_table = NULL; } diff --git a/net/ipv4/netfilter/nf_flow_table_ipv4.c b/net/ipv4/netfilter/nf_flow_table_ipv4.c index 0cd46bffa469..e1e56d7123d2 100644 --- a/net/ipv4/netfilter/nf_flow_table_ipv4.c +++ b/net/ipv4/netfilter/nf_flow_table_ipv4.c @@ -2,265 +2,12 @@ #include <linux/init.h> #include <linux/module.h> #include <linux/netfilter.h> -#include <linux/rhashtable.h> -#include <linux/ip.h> -#include <linux/netdevice.h> -#include <net/ip.h> -#include <net/neighbour.h> #include <net/netfilter/nf_flow_table.h> #include <net/netfilter/nf_tables.h> -/* For layer 4 checksum field offset. */ -#include <linux/tcp.h> -#include <linux/udp.h> - -static int nf_flow_nat_ip_tcp(struct sk_buff *skb, unsigned int thoff, - __be32 addr, __be32 new_addr) -{ - struct tcphdr *tcph; - - if (!pskb_may_pull(skb, thoff + sizeof(*tcph)) || - skb_try_make_writable(skb, thoff + sizeof(*tcph))) - return -1; - - tcph = (void *)(skb_network_header(skb) + thoff); - inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr, true); - - return 0; -} - -static int nf_flow_nat_ip_udp(struct sk_buff *skb, unsigned int thoff, - __be32 addr, __be32 new_addr) -{ - struct udphdr *udph; - - if (!pskb_may_pull(skb, thoff + sizeof(*udph)) || - skb_try_make_writable(skb, thoff + sizeof(*udph))) - return -1; - - udph = (void *)(skb_network_header(skb) + thoff); - if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { - inet_proto_csum_replace4(&udph->check, skb, addr, - new_addr, true); - if (!udph->check) - udph->check = CSUM_MANGLED_0; - } - - return 0; -} - -static int nf_flow_nat_ip_l4proto(struct sk_buff *skb, struct iphdr *iph, - unsigned int thoff, __be32 addr, - __be32 new_addr) -{ - switch (iph->protocol) { - case IPPROTO_TCP: - if (nf_flow_nat_ip_tcp(skb, thoff, addr, new_addr) < 0) - return NF_DROP; - break; - case IPPROTO_UDP: - if (nf_flow_nat_ip_udp(skb, thoff, addr, new_addr) < 0) - return NF_DROP; - break; - } - - return 0; -} - -static int nf_flow_snat_ip(const struct flow_offload *flow, struct sk_buff *skb, - struct iphdr *iph, unsigned int thoff, - enum flow_offload_tuple_dir dir) -{ - __be32 addr, new_addr; - - switch (dir) { - case FLOW_OFFLOAD_DIR_ORIGINAL: - addr = iph->saddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_v4.s_addr; - iph->saddr = new_addr; - break; - case FLOW_OFFLOAD_DIR_REPLY: - addr = iph->daddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_v4.s_addr; - iph->daddr = new_addr; - break; - default: - return -1; - } - csum_replace4(&iph->check, addr, new_addr); - - return nf_flow_nat_ip_l4proto(skb, iph, thoff, addr, new_addr); -} - -static int nf_flow_dnat_ip(const struct flow_offload *flow, struct sk_buff *skb, - struct iphdr *iph, unsigned int thoff, - enum flow_offload_tuple_dir dir) -{ - __be32 addr, new_addr; - - switch (dir) { - case FLOW_OFFLOAD_DIR_ORIGINAL: - addr = iph->daddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_v4.s_addr; - iph->daddr = new_addr; - break; - case FLOW_OFFLOAD_DIR_REPLY: - addr = iph->saddr; - new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_v4.s_addr; - iph->saddr = new_addr; - break; - default: - return -1; - } - csum_replace4(&iph->check, addr, new_addr); - - return nf_flow_nat_ip_l4proto(skb, iph, thoff, addr, new_addr); -} - -static int nf_flow_nat_ip(const struct flow_offload *flow, struct sk_buff *skb, - enum flow_offload_tuple_dir dir) -{ - struct iphdr *iph = ip_hdr(skb); - unsigned int thoff = iph->ihl * 4; - - if (flow->flags & FLOW_OFFLOAD_SNAT && - (nf_flow_snat_port(flow, skb, thoff, iph->protocol, dir) < 0 || - nf_flow_snat_ip(flow, skb, iph, thoff, dir) < 0)) - return -1; - if (flow->flags & FLOW_OFFLOAD_DNAT && - (nf_flow_dnat_port(flow, skb, thoff, iph->protocol, dir) < 0 || - nf_flow_dnat_ip(flow, skb, iph, thoff, dir) < 0)) - return -1; - - return 0; -} - -static bool ip_has_options(unsigned int thoff) -{ - return thoff != sizeof(struct iphdr); -} - -static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev, - struct flow_offload_tuple *tuple) -{ - struct flow_ports *ports; - unsigned int thoff; - struct iphdr *iph; - - if (!pskb_may_pull(skb, sizeof(*iph))) - return -1; - - iph = ip_hdr(skb); - thoff = iph->ihl * 4; - - if (ip_is_fragment(iph) || - unlikely(ip_has_options(thoff))) - return -1; - - if (iph->protocol != IPPROTO_TCP && - iph->protocol != IPPROTO_UDP) - return -1; - - thoff = iph->ihl * 4; - if (!pskb_may_pull(skb, thoff + sizeof(*ports))) - return -1; - - ports = (struct flow_ports *)(skb_network_header(skb) + thoff); - - tuple->src_v4.s_addr = iph->saddr; - tuple->dst_v4.s_addr = iph->daddr; - tuple->src_port = ports->source; - tuple->dst_port = ports->dest; - tuple->l3proto = AF_INET; - tuple->l4proto = iph->protocol; - tuple->iifidx = dev->ifindex; - - return 0; -} - -/* Based on ip_exceeds_mtu(). */ -static bool __nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu) -{ - if (skb->len <= mtu) - return false; - - if ((ip_hdr(skb)->frag_off & htons(IP_DF)) == 0) - return false; - - if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) - return false; - - return true; -} - -static bool nf_flow_exceeds_mtu(struct sk_buff *skb, const struct rtable *rt) -{ - u32 mtu; - - mtu = ip_dst_mtu_maybe_forward(&rt->dst, true); - if (__nf_flow_exceeds_mtu(skb, mtu)) - return true; - - return false; -} - -unsigned int -nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state) -{ - struct flow_offload_tuple_rhash *tuplehash; - struct nf_flowtable *flow_table = priv; - struct flow_offload_tuple tuple = {}; - enum flow_offload_tuple_dir dir; - struct flow_offload *flow; - struct net_device *outdev; - const struct rtable *rt; - struct iphdr *iph; - __be32 nexthop; - - if (skb->protocol != htons(ETH_P_IP)) - return NF_ACCEPT; - - if (nf_flow_tuple_ip(skb, state->in, &tuple) < 0) - return NF_ACCEPT; - - tuplehash = flow_offload_lookup(flow_table, &tuple); - if (tuplehash == NULL) - return NF_ACCEPT; - - outdev = dev_get_by_index_rcu(state->net, tuplehash->tuple.oifidx); - if (!outdev) - return NF_ACCEPT; - - dir = tuplehash->tuple.dir; - flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); - - rt = (const struct rtable *)flow->tuplehash[dir].tuple.dst_cache; - if (unlikely(nf_flow_exceeds_mtu(skb, rt))) - return NF_ACCEPT; - - if (skb_try_make_writable(skb, sizeof(*iph))) - return NF_DROP; - - if (flow->flags & (FLOW_OFFLOAD_SNAT | FLOW_OFFLOAD_DNAT) && - nf_flow_nat_ip(flow, skb, dir) < 0) - return NF_DROP; - - flow->timeout = (u32)jiffies + NF_FLOW_TIMEOUT; - iph = ip_hdr(skb); - ip_decrease_ttl(iph); - - skb->dev = outdev; - nexthop = rt_nexthop(rt, flow->tuplehash[!dir].tuple.src_v4.s_addr); - neigh_xmit(NEIGH_ARP_TABLE, outdev, &nexthop, skb); - - return NF_STOLEN; -} -EXPORT_SYMBOL_GPL(nf_flow_offload_ip_hook); static struct nf_flowtable_type flowtable_ipv4 = { .family = NFPROTO_IPV4, - .params = &nf_flow_offload_rhash_params, - .gc = nf_flow_offload_work_gc, + .init = nf_flow_table_init, .free = nf_flow_table_free, .hook = nf_flow_offload_ip_hook, .owner = THIS_MODULE, diff --git a/net/ipv4/netfilter/nf_nat_h323.c b/net/ipv4/netfilter/nf_nat_h323.c index ac8342dcb55e..4e6b53ab6c33 100644 --- a/net/ipv4/netfilter/nf_nat_h323.c +++ b/net/ipv4/netfilter/nf_nat_h323.c @@ -395,7 +395,7 @@ static int nat_h245(struct sk_buff *skb, struct nf_conn *ct, static void ip_nat_q931_expect(struct nf_conn *new, struct nf_conntrack_expect *this) { - struct nf_nat_range range; + struct nf_nat_range2 range; if (this->tuple.src.u3.ip != 0) { /* Only accept calls from GK */ nf_nat_follow_master(new, this); @@ -497,7 +497,7 @@ static int nat_q931(struct sk_buff *skb, struct nf_conn *ct, static void ip_nat_callforwarding_expect(struct nf_conn *new, struct nf_conntrack_expect *this) { - struct nf_nat_range range; + struct nf_nat_range2 range; /* This must be a fresh one. */ BUG_ON(new->status & IPS_NAT_DONE_MASK); diff --git a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c index f7ff6a364d7b..6115bf1ff6f0 100644 --- a/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c +++ b/net/ipv4/netfilter/nf_nat_l3proto_ipv4.c @@ -63,7 +63,7 @@ static void nf_nat_ipv4_decode_session(struct sk_buff *skb, #endif /* CONFIG_XFRM */ static bool nf_nat_ipv4_in_range(const struct nf_conntrack_tuple *t, - const struct nf_nat_range *range) + const struct nf_nat_range2 *range) { return ntohl(t->src.u3.ip) >= ntohl(range->min_addr.ip) && ntohl(t->src.u3.ip) <= ntohl(range->max_addr.ip); @@ -143,7 +143,7 @@ static void nf_nat_ipv4_csum_recalc(struct sk_buff *skb, #if IS_ENABLED(CONFIG_NF_CT_NETLINK) static int nf_nat_ipv4_nlattr_to_range(struct nlattr *tb[], - struct nf_nat_range *range) + struct nf_nat_range2 *range) { if (tb[CTA_NAT_V4_MINIP]) { range->min_addr.ip = nla_get_be32(tb[CTA_NAT_V4_MINIP]); @@ -241,34 +241,18 @@ int nf_nat_icmp_reply_translation(struct sk_buff *skb, } EXPORT_SYMBOL_GPL(nf_nat_icmp_reply_translation); -unsigned int +static unsigned int nf_nat_ipv4_fn(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state, - struct nf_conn *ct)) + const struct nf_hook_state *state) { struct nf_conn *ct; enum ip_conntrack_info ctinfo; - struct nf_conn_nat *nat; - /* maniptype == SRC for postrouting. */ - enum nf_nat_manip_type maniptype = HOOK2MANIP(state->hook); ct = nf_ct_get(skb, &ctinfo); - /* Can't track? It's not due to stress, or conntrack would - * have dropped it. Hence it's the user's responsibilty to - * packet filter it out, or implement conntrack/NAT for that - * protocol. 8) --RR - */ if (!ct) return NF_ACCEPT; - nat = nfct_nat(ct); - - switch (ctinfo) { - case IP_CT_RELATED: - case IP_CT_RELATED_REPLY: + if (ctinfo == IP_CT_RELATED || ctinfo == IP_CT_RELATED_REPLY) { if (ip_hdr(skb)->protocol == IPPROTO_ICMP) { if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo, state->hook)) @@ -276,78 +260,30 @@ nf_nat_ipv4_fn(void *priv, struct sk_buff *skb, else return NF_ACCEPT; } - /* Only ICMPs can be IP_CT_IS_REPLY: */ - /* fall through */ - case IP_CT_NEW: - /* Seen it before? This can happen for loopback, retrans, - * or local packets. - */ - if (!nf_nat_initialized(ct, maniptype)) { - unsigned int ret; - - ret = do_chain(priv, skb, state, ct); - if (ret != NF_ACCEPT) - return ret; - - if (nf_nat_initialized(ct, HOOK2MANIP(state->hook))) - break; - - ret = nf_nat_alloc_null_binding(ct, state->hook); - if (ret != NF_ACCEPT) - return ret; - } else { - pr_debug("Already setup manip %s for ct %p\n", - maniptype == NF_NAT_MANIP_SRC ? "SRC" : "DST", - ct); - if (nf_nat_oif_changed(state->hook, ctinfo, nat, - state->out)) - goto oif_changed; - } - break; - - default: - /* ESTABLISHED */ - WARN_ON(ctinfo != IP_CT_ESTABLISHED && - ctinfo != IP_CT_ESTABLISHED_REPLY); - if (nf_nat_oif_changed(state->hook, ctinfo, nat, state->out)) - goto oif_changed; } - return nf_nat_packet(ct, ctinfo, state->hook, skb); - -oif_changed: - nf_ct_kill_acct(ct, ctinfo, skb); - return NF_DROP; + return nf_nat_inet_fn(priv, skb, state); } EXPORT_SYMBOL_GPL(nf_nat_ipv4_fn); -unsigned int +static unsigned int nf_nat_ipv4_in(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state, - struct nf_conn *ct)) + const struct nf_hook_state *state) { unsigned int ret; __be32 daddr = ip_hdr(skb)->daddr; - ret = nf_nat_ipv4_fn(priv, skb, state, do_chain); + ret = nf_nat_ipv4_fn(priv, skb, state); if (ret != NF_DROP && ret != NF_STOLEN && daddr != ip_hdr(skb)->daddr) skb_dst_drop(skb); return ret; } -EXPORT_SYMBOL_GPL(nf_nat_ipv4_in); -unsigned int +static unsigned int nf_nat_ipv4_out(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state, - struct nf_conn *ct)) + const struct nf_hook_state *state) { #ifdef CONFIG_XFRM const struct nf_conn *ct; @@ -356,7 +292,7 @@ nf_nat_ipv4_out(void *priv, struct sk_buff *skb, #endif unsigned int ret; - ret = nf_nat_ipv4_fn(priv, skb, state, do_chain); + ret = nf_nat_ipv4_fn(priv, skb, state); #ifdef CONFIG_XFRM if (ret != NF_DROP && ret != NF_STOLEN && !(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) && @@ -376,22 +312,17 @@ nf_nat_ipv4_out(void *priv, struct sk_buff *skb, #endif return ret; } -EXPORT_SYMBOL_GPL(nf_nat_ipv4_out); -unsigned int +static unsigned int nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb, - const struct nf_hook_state *state, - unsigned int (*do_chain)(void *priv, - struct sk_buff *skb, - const struct nf_hook_state *state, - struct nf_conn *ct)) + const struct nf_hook_state *state) { const struct nf_conn *ct; enum ip_conntrack_info ctinfo; unsigned int ret; int err; - ret = nf_nat_ipv4_fn(priv, skb, state, do_chain); + ret = nf_nat_ipv4_fn(priv, skb, state); if (ret != NF_DROP && ret != NF_STOLEN && (ct = nf_ct_get(skb, &ctinfo)) != NULL) { enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo); @@ -415,7 +346,49 @@ nf_nat_ipv4_local_fn(void *priv, struct sk_buff *skb, } return ret; } -EXPORT_SYMBOL_GPL(nf_nat_ipv4_local_fn); + +static const struct nf_hook_ops nf_nat_ipv4_ops[] = { + /* Before packet filtering, change destination */ + { + .hook = nf_nat_ipv4_in, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_PRE_ROUTING, + .priority = NF_IP_PRI_NAT_DST, + }, + /* After packet filtering, change source */ + { + .hook = nf_nat_ipv4_out, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP_PRI_NAT_SRC, + }, + /* Before packet filtering, change destination */ + { + .hook = nf_nat_ipv4_local_fn, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_NAT_DST, + }, + /* After packet filtering, change source */ + { + .hook = nf_nat_ipv4_fn, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_IN, + .priority = NF_IP_PRI_NAT_SRC, + }, +}; + +int nf_nat_l3proto_ipv4_register_fn(struct net *net, const struct nf_hook_ops *ops) +{ + return nf_nat_register_fn(net, ops, nf_nat_ipv4_ops, ARRAY_SIZE(nf_nat_ipv4_ops)); +} +EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv4_register_fn); + +void nf_nat_l3proto_ipv4_unregister_fn(struct net *net, const struct nf_hook_ops *ops) +{ + nf_nat_unregister_fn(net, ops, ARRAY_SIZE(nf_nat_ipv4_ops)); +} +EXPORT_SYMBOL_GPL(nf_nat_l3proto_ipv4_unregister_fn); static int __init nf_nat_l3proto_ipv4_init(void) { diff --git a/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c b/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c index 0c366aad89cb..ad3aeff152ed 100644 --- a/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c +++ b/net/ipv4/netfilter/nf_nat_masquerade_ipv4.c @@ -7,7 +7,6 @@ */ #include <linux/types.h> -#include <linux/module.h> #include <linux/atomic.h> #include <linux/inetdevice.h> #include <linux/ip.h> @@ -24,13 +23,13 @@ unsigned int nf_nat_masquerade_ipv4(struct sk_buff *skb, unsigned int hooknum, - const struct nf_nat_range *range, + const struct nf_nat_range2 *range, const struct net_device *out) { struct nf_conn *ct; struct nf_conn_nat *nat; enum ip_conntrack_info ctinfo; - struct nf_nat_range newrange; + struct nf_nat_range2 newrange; const struct rtable *rt; __be32 newsrc, nh; @@ -157,6 +156,3 @@ void nf_nat_masquerade_ipv4_unregister_notifier(void) unregister_inetaddr_notifier(&masq_inet_notifier); } EXPORT_SYMBOL_GPL(nf_nat_masquerade_ipv4_unregister_notifier); - -MODULE_LICENSE("GPL"); -MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>"); diff --git a/net/ipv4/netfilter/nf_nat_pptp.c b/net/ipv4/netfilter/nf_nat_pptp.c index 8a69363b4884..5d259a12e25f 100644 --- a/net/ipv4/netfilter/nf_nat_pptp.c +++ b/net/ipv4/netfilter/nf_nat_pptp.c @@ -48,7 +48,7 @@ static void pptp_nat_expected(struct nf_conn *ct, struct nf_conntrack_tuple t = {}; const struct nf_ct_pptp_master *ct_pptp_info; const struct nf_nat_pptp *nat_pptp_info; - struct nf_nat_range range; + struct nf_nat_range2 range; struct nf_conn_nat *nat; nat = nf_ct_nat_ext_add(ct); diff --git a/net/ipv4/netfilter/nf_nat_proto_gre.c b/net/ipv4/netfilter/nf_nat_proto_gre.c index edf05002d674..00fda6331ce5 100644 --- a/net/ipv4/netfilter/nf_nat_proto_gre.c +++ b/net/ipv4/netfilter/nf_nat_proto_gre.c @@ -41,7 +41,7 @@ MODULE_DESCRIPTION("Netfilter NAT protocol helper module for GRE"); static void gre_unique_tuple(const struct nf_nat_l3proto *l3proto, struct nf_conntrack_tuple *tuple, - const struct nf_nat_range *range, + const struct nf_nat_range2 *range, enum nf_nat_manip_type maniptype, const struct nf_conn *ct) { diff --git a/net/ipv4/netfilter/nf_nat_proto_icmp.c b/net/ipv4/netfilter/nf_nat_proto_icmp.c index 7b98baa13ede..6d7cf1d79baf 100644 --- a/net/ipv4/netfilter/nf_nat_proto_icmp.c +++ b/net/ipv4/netfilter/nf_nat_proto_icmp.c @@ -30,7 +30,7 @@ icmp_in_range(const struct nf_conntrack_tuple *tuple, static void icmp_unique_tuple(const struct nf_nat_l3proto *l3proto, struct nf_conntrack_tuple *tuple, - const struct nf_nat_range *range, + const struct nf_nat_range2 *range, enum nf_nat_manip_type maniptype, const struct nf_conn *ct) { diff --git a/net/ipv4/netfilter/nf_tproxy_ipv4.c b/net/ipv4/netfilter/nf_tproxy_ipv4.c new file mode 100644 index 000000000000..805e83ec3ad9 --- /dev/null +++ b/net/ipv4/netfilter/nf_tproxy_ipv4.c @@ -0,0 +1,147 @@ +/* + * Copyright (C) 2007-2008 BalaBit IT Ltd. + * Author: Krisztian Kovacs + * + * 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 <net/netfilter/nf_tproxy.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <net/sock.h> +#include <net/inet_sock.h> +#include <linux/ip.h> +#include <net/checksum.h> +#include <net/udp.h> +#include <net/tcp.h> +#include <linux/inetdevice.h> + +struct sock * +nf_tproxy_handle_time_wait4(struct net *net, struct sk_buff *skb, + __be32 laddr, __be16 lport, struct sock *sk) +{ + const struct iphdr *iph = ip_hdr(skb); + struct tcphdr _hdr, *hp; + + hp = skb_header_pointer(skb, ip_hdrlen(skb), sizeof(_hdr), &_hdr); + if (hp == NULL) { + inet_twsk_put(inet_twsk(sk)); + return NULL; + } + + if (hp->syn && !hp->rst && !hp->ack && !hp->fin) { + /* SYN to a TIME_WAIT socket, we'd rather redirect it + * to a listener socket if there's one */ + struct sock *sk2; + + sk2 = nf_tproxy_get_sock_v4(net, skb, hp, iph->protocol, + iph->saddr, laddr ? laddr : iph->daddr, + hp->source, lport ? lport : hp->dest, + skb->dev, NF_TPROXY_LOOKUP_LISTENER); + if (sk2) { + inet_twsk_deschedule_put(inet_twsk(sk)); + sk = sk2; + } + } + + return sk; +} +EXPORT_SYMBOL_GPL(nf_tproxy_handle_time_wait4); + +__be32 nf_tproxy_laddr4(struct sk_buff *skb, __be32 user_laddr, __be32 daddr) +{ + struct in_device *indev; + __be32 laddr; + + if (user_laddr) + return user_laddr; + + laddr = 0; + indev = __in_dev_get_rcu(skb->dev); + for_primary_ifa(indev) { + laddr = ifa->ifa_local; + break; + } endfor_ifa(indev); + + return laddr ? laddr : daddr; +} +EXPORT_SYMBOL_GPL(nf_tproxy_laddr4); + +struct sock * +nf_tproxy_get_sock_v4(struct net *net, struct sk_buff *skb, void *hp, + const u8 protocol, + const __be32 saddr, const __be32 daddr, + const __be16 sport, const __be16 dport, + const struct net_device *in, + const enum nf_tproxy_lookup_t lookup_type) +{ + struct sock *sk; + struct tcphdr *tcph; + + switch (protocol) { + case IPPROTO_TCP: + switch (lookup_type) { + case NF_TPROXY_LOOKUP_LISTENER: + tcph = hp; + sk = inet_lookup_listener(net, &tcp_hashinfo, skb, + ip_hdrlen(skb) + + __tcp_hdrlen(tcph), + saddr, sport, + daddr, dport, + in->ifindex, 0); + + if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) + sk = NULL; + /* NOTE: we return listeners even if bound to + * 0.0.0.0, those are filtered out in + * xt_socket, since xt_TPROXY needs 0 bound + * listeners too + */ + break; + case NF_TPROXY_LOOKUP_ESTABLISHED: + sk = inet_lookup_established(net, &tcp_hashinfo, + saddr, sport, daddr, dport, + in->ifindex); + break; + default: + BUG(); + } + break; + case IPPROTO_UDP: + sk = udp4_lib_lookup(net, saddr, sport, daddr, dport, + in->ifindex); + if (sk) { + int connected = (sk->sk_state == TCP_ESTABLISHED); + int wildcard = (inet_sk(sk)->inet_rcv_saddr == 0); + + /* NOTE: we return listeners even if bound to + * 0.0.0.0, those are filtered out in + * xt_socket, since xt_TPROXY needs 0 bound + * listeners too + */ + if ((lookup_type == NF_TPROXY_LOOKUP_ESTABLISHED && + (!connected |