diff options
Diffstat (limited to 'kernel/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c')
-rw-r--r-- | kernel/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c | 542 |
1 files changed, 542 insertions, 0 deletions
diff --git a/kernel/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c b/kernel/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c new file mode 100644 index 000000000..30ad9554b --- /dev/null +++ b/kernel/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c @@ -0,0 +1,542 @@ + +/* (C) 1999-2001 Paul `Rusty' Russell + * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> + * (C) 2006-2012 Patrick McHardy <kaber@trash.net> + * + * 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/types.h> +#include <linux/ip.h> +#include <linux/netfilter.h> +#include <linux/module.h> +#include <linux/skbuff.h> +#include <linux/icmp.h> +#include <linux/sysctl.h> +#include <net/route.h> +#include <net/ip.h> + +#include <linux/netfilter_ipv4.h> +#include <net/netfilter/nf_conntrack.h> +#include <net/netfilter/nf_conntrack_helper.h> +#include <net/netfilter/nf_conntrack_l4proto.h> +#include <net/netfilter/nf_conntrack_l3proto.h> +#include <net/netfilter/nf_conntrack_zones.h> +#include <net/netfilter/nf_conntrack_core.h> +#include <net/netfilter/nf_conntrack_seqadj.h> +#include <net/netfilter/ipv4/nf_conntrack_ipv4.h> +#include <net/netfilter/nf_nat_helper.h> +#include <net/netfilter/ipv4/nf_defrag_ipv4.h> +#include <net/netfilter/nf_log.h> + +static bool ipv4_pkt_to_tuple(const struct sk_buff *skb, unsigned int nhoff, + struct nf_conntrack_tuple *tuple) +{ + const __be32 *ap; + __be32 _addrs[2]; + ap = skb_header_pointer(skb, nhoff + offsetof(struct iphdr, saddr), + sizeof(u_int32_t) * 2, _addrs); + if (ap == NULL) + return false; + + tuple->src.u3.ip = ap[0]; + tuple->dst.u3.ip = ap[1]; + + return true; +} + +static bool ipv4_invert_tuple(struct nf_conntrack_tuple *tuple, + const struct nf_conntrack_tuple *orig) +{ + tuple->src.u3.ip = orig->dst.u3.ip; + tuple->dst.u3.ip = orig->src.u3.ip; + + return true; +} + +static void ipv4_print_tuple(struct seq_file *s, + const struct nf_conntrack_tuple *tuple) +{ + seq_printf(s, "src=%pI4 dst=%pI4 ", + &tuple->src.u3.ip, &tuple->dst.u3.ip); +} + +static int ipv4_get_l4proto(const struct sk_buff *skb, unsigned int nhoff, + unsigned int *dataoff, u_int8_t *protonum) +{ + const struct iphdr *iph; + struct iphdr _iph; + + iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); + if (iph == NULL) + return -NF_ACCEPT; + + /* Conntrack defragments packets, we might still see fragments + * inside ICMP packets though. */ + if (iph->frag_off & htons(IP_OFFSET)) + return -NF_ACCEPT; + + *dataoff = nhoff + (iph->ihl << 2); + *protonum = iph->protocol; + + /* Check bogus IP headers */ + if (*dataoff > skb->len) { + pr_debug("nf_conntrack_ipv4: bogus IPv4 packet: " + "nhoff %u, ihl %u, skblen %u\n", + nhoff, iph->ihl << 2, skb->len); + return -NF_ACCEPT; + } + + return NF_ACCEPT; +} + +static unsigned int ipv4_helper(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nf_conn *ct; + enum ip_conntrack_info ctinfo; + const struct nf_conn_help *help; + const struct nf_conntrack_helper *helper; + + /* This is where we call the helper: as the packet goes out. */ + ct = nf_ct_get(skb, &ctinfo); + if (!ct || ctinfo == IP_CT_RELATED_REPLY) + return NF_ACCEPT; + + help = nfct_help(ct); + if (!help) + return NF_ACCEPT; + + /* rcu_read_lock()ed by nf_hook_slow */ + helper = rcu_dereference(help->helper); + if (!helper) + return NF_ACCEPT; + + return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb), + ct, ctinfo); +} + +static unsigned int ipv4_confirm(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct nf_conn *ct; + enum ip_conntrack_info ctinfo; + + ct = nf_ct_get(skb, &ctinfo); + if (!ct || ctinfo == IP_CT_RELATED_REPLY) + goto out; + + /* adjust seqs for loopback traffic only in outgoing direction */ + if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) && + !nf_is_loopback_packet(skb)) { + if (!nf_ct_seq_adjust(skb, ct, ctinfo, ip_hdrlen(skb))) { + NF_CT_STAT_INC_ATOMIC(nf_ct_net(ct), drop); + return NF_DROP; + } + } +out: + /* We've seen it coming out the other side: confirm it */ + return nf_conntrack_confirm(skb); +} + +static unsigned int ipv4_conntrack_in(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + return nf_conntrack_in(dev_net(state->in), PF_INET, ops->hooknum, skb); +} + +static unsigned int ipv4_conntrack_local(const struct nf_hook_ops *ops, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + /* root is playing with raw sockets. */ + if (skb->len < sizeof(struct iphdr) || + ip_hdrlen(skb) < sizeof(struct iphdr)) + return NF_ACCEPT; + return nf_conntrack_in(dev_net(state->out), PF_INET, ops->hooknum, skb); +} + +/* Connection tracking may drop packets, but never alters them, so + make it the first hook. */ +static struct nf_hook_ops ipv4_conntrack_ops[] __read_mostly = { + { + .hook = ipv4_conntrack_in, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_PRE_ROUTING, + .priority = NF_IP_PRI_CONNTRACK, + }, + { + .hook = ipv4_conntrack_local, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_CONNTRACK, + }, + { + .hook = ipv4_helper, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP_PRI_CONNTRACK_HELPER, + }, + { + .hook = ipv4_confirm, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_POST_ROUTING, + .priority = NF_IP_PRI_CONNTRACK_CONFIRM, + }, + { + .hook = ipv4_helper, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_IN, + .priority = NF_IP_PRI_CONNTRACK_HELPER, + }, + { + .hook = ipv4_confirm, + .owner = THIS_MODULE, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_IN, + .priority = NF_IP_PRI_CONNTRACK_CONFIRM, + }, +}; + +#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) +static int log_invalid_proto_min = 0; +static int log_invalid_proto_max = 255; + +static struct ctl_table ip_ct_sysctl_table[] = { + { + .procname = "ip_conntrack_max", + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "ip_conntrack_count", + .maxlen = sizeof(int), + .mode = 0444, + .proc_handler = proc_dointvec, + }, + { + .procname = "ip_conntrack_buckets", + .maxlen = sizeof(unsigned int), + .mode = 0444, + .proc_handler = proc_dointvec, + }, + { + .procname = "ip_conntrack_checksum", + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "ip_conntrack_log_invalid", + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &log_invalid_proto_min, + .extra2 = &log_invalid_proto_max, + }, + { } +}; +#endif /* CONFIG_SYSCTL && CONFIG_NF_CONNTRACK_PROC_COMPAT */ + +/* Fast function for those who don't want to parse /proc (and I don't + blame them). */ +/* Reversing the socket's dst/src point of view gives us the reply + mapping. */ +static int +getorigdst(struct sock *sk, int optval, void __user *user, int *len) +{ + const struct inet_sock *inet = inet_sk(sk); + const struct nf_conntrack_tuple_hash *h; + struct nf_conntrack_tuple tuple; + + memset(&tuple, 0, sizeof(tuple)); + tuple.src.u3.ip = inet->inet_rcv_saddr; + tuple.src.u.tcp.port = inet->inet_sport; + tuple.dst.u3.ip = inet->inet_daddr; + tuple.dst.u.tcp.port = inet->inet_dport; + tuple.src.l3num = PF_INET; + tuple.dst.protonum = sk->sk_protocol; + + /* We only do TCP and SCTP at the moment: is there a better way? */ + if (sk->sk_protocol != IPPROTO_TCP && sk->sk_protocol != IPPROTO_SCTP) { + pr_debug("SO_ORIGINAL_DST: Not a TCP/SCTP socket\n"); + return -ENOPROTOOPT; + } + + if ((unsigned int) *len < sizeof(struct sockaddr_in)) { + pr_debug("SO_ORIGINAL_DST: len %d not %Zu\n", + *len, sizeof(struct sockaddr_in)); + return -EINVAL; + } + + h = nf_conntrack_find_get(sock_net(sk), NF_CT_DEFAULT_ZONE, &tuple); + if (h) { + struct sockaddr_in sin; + struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h); + + sin.sin_family = AF_INET; + sin.sin_port = ct->tuplehash[IP_CT_DIR_ORIGINAL] + .tuple.dst.u.tcp.port; + sin.sin_addr.s_addr = ct->tuplehash[IP_CT_DIR_ORIGINAL] + .tuple.dst.u3.ip; + memset(sin.sin_zero, 0, sizeof(sin.sin_zero)); + + pr_debug("SO_ORIGINAL_DST: %pI4 %u\n", + &sin.sin_addr.s_addr, ntohs(sin.sin_port)); + nf_ct_put(ct); + if (copy_to_user(user, &sin, sizeof(sin)) != 0) + return -EFAULT; + else + return 0; + } + pr_debug("SO_ORIGINAL_DST: Can't find %pI4/%u-%pI4/%u.\n", + &tuple.src.u3.ip, ntohs(tuple.src.u.tcp.port), + &tuple.dst.u3.ip, ntohs(tuple.dst.u.tcp.port)); + return -ENOENT; +} + +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) + +#include <linux/netfilter/nfnetlink.h> +#include <linux/netfilter/nfnetlink_conntrack.h> + +static int ipv4_tuple_to_nlattr(struct sk_buff *skb, + const struct nf_conntrack_tuple *tuple) +{ + if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) || + nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip)) + goto nla_put_failure; + return 0; + +nla_put_failure: + return -1; +} + +static const struct nla_policy ipv4_nla_policy[CTA_IP_MAX+1] = { + [CTA_IP_V4_SRC] = { .type = NLA_U32 }, + [CTA_IP_V4_DST] = { .type = NLA_U32 }, +}; + +static int ipv4_nlattr_to_tuple(struct nlattr *tb[], + struct nf_conntrack_tuple *t) +{ + if (!tb[CTA_IP_V4_SRC] || !tb[CTA_IP_V4_DST]) + return -EINVAL; + + t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]); + t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]); + + return 0; +} + +static int ipv4_nlattr_tuple_size(void) +{ + return nla_policy_len(ipv4_nla_policy, CTA_IP_MAX + 1); +} +#endif + +static struct nf_sockopt_ops so_getorigdst = { + .pf = PF_INET, + .get_optmin = SO_ORIGINAL_DST, + .get_optmax = SO_ORIGINAL_DST+1, + .get = getorigdst, + .owner = THIS_MODULE, +}; + +static int ipv4_init_net(struct net *net) +{ +#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) + struct nf_ip_net *in = &net->ct.nf_ct_proto; + in->ctl_table = kmemdup(ip_ct_sysctl_table, + sizeof(ip_ct_sysctl_table), + GFP_KERNEL); + if (!in->ctl_table) + return -ENOMEM; + + in->ctl_table[0].data = &nf_conntrack_max; + in->ctl_table[1].data = &net->ct.count; + in->ctl_table[2].data = &net->ct.htable_size; + in->ctl_table[3].data = &net->ct.sysctl_checksum; + in->ctl_table[4].data = &net->ct.sysctl_log_invalid; +#endif + return 0; +} + +struct nf_conntrack_l3proto nf_conntrack_l3proto_ipv4 __read_mostly = { + .l3proto = PF_INET, + .name = "ipv4", + .pkt_to_tuple = ipv4_pkt_to_tuple, + .invert_tuple = ipv4_invert_tuple, + .print_tuple = ipv4_print_tuple, + .get_l4proto = ipv4_get_l4proto, +#if IS_ENABLED(CONFIG_NF_CT_NETLINK) + .tuple_to_nlattr = ipv4_tuple_to_nlattr, + .nlattr_tuple_size = ipv4_nlattr_tuple_size, + .nlattr_to_tuple = ipv4_nlattr_to_tuple, + .nla_policy = ipv4_nla_policy, +#endif +#if defined(CONFIG_SYSCTL) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) + .ctl_table_path = "net/ipv4/netfilter", +#endif + .init_net = ipv4_init_net, + .me = THIS_MODULE, +}; + +module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, + &nf_conntrack_htable_size, 0600); + +MODULE_ALIAS("nf_conntrack-" __stringify(AF_INET)); +MODULE_ALIAS("ip_conntrack"); +MODULE_LICENSE("GPL"); + +static int ipv4_net_init(struct net *net) +{ + int ret = 0; + + ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_tcp4); + if (ret < 0) { + pr_err("nf_conntrack_tcp4: pernet registration failed\n"); + goto out_tcp; + } + ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_udp4); + if (ret < 0) { + pr_err("nf_conntrack_udp4: pernet registration failed\n"); + goto out_udp; + } + ret = nf_ct_l4proto_pernet_register(net, &nf_conntrack_l4proto_icmp); + if (ret < 0) { + pr_err("nf_conntrack_icmp4: pernet registration failed\n"); + goto out_icmp; + } + ret = nf_ct_l3proto_pernet_register(net, &nf_conntrack_l3proto_ipv4); + if (ret < 0) { + pr_err("nf_conntrack_ipv4: pernet registration failed\n"); + goto out_ipv4; + } + return 0; +out_ipv4: + nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp); +out_icmp: + nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4); +out_udp: + nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4); +out_tcp: + return ret; +} + +static void ipv4_net_exit(struct net *net) +{ + nf_ct_l3proto_pernet_unregister(net, &nf_conntrack_l3proto_ipv4); + nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_icmp); + nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_udp4); + nf_ct_l4proto_pernet_unregister(net, &nf_conntrack_l4proto_tcp4); +} + +static struct pernet_operations ipv4_net_ops = { + .init = ipv4_net_init, + .exit = ipv4_net_exit, +}; + +static int __init nf_conntrack_l3proto_ipv4_init(void) +{ + int ret = 0; + + need_conntrack(); + nf_defrag_ipv4_enable(); + + ret = nf_register_sockopt(&so_getorigdst); + if (ret < 0) { + printk(KERN_ERR "Unable to register netfilter socket option\n"); + return ret; + } + + ret = register_pernet_subsys(&ipv4_net_ops); + if (ret < 0) { + pr_err("nf_conntrack_ipv4: can't register pernet ops\n"); + goto cleanup_sockopt; + } + + ret = nf_register_hooks(ipv4_conntrack_ops, + ARRAY_SIZE(ipv4_conntrack_ops)); + if (ret < 0) { + pr_err("nf_conntrack_ipv4: can't register hooks.\n"); + goto cleanup_pernet; + } + + ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_tcp4); + if (ret < 0) { + pr_err("nf_conntrack_ipv4: can't register tcp4 proto.\n"); + goto cleanup_hooks; + } + + ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_udp4); + if (ret < 0) { + pr_err("nf_conntrack_ipv4: can't register udp4 proto.\n"); + goto cleanup_tcp4; + } + + ret = nf_ct_l4proto_register(&nf_conntrack_l4proto_icmp); + if (ret < 0) { + pr_err("nf_conntrack_ipv4: can't register icmpv4 proto.\n"); + goto cleanup_udp4; + } + + ret = nf_ct_l3proto_register(&nf_conntrack_l3proto_ipv4); + if (ret < 0) { + pr_err("nf_conntrack_ipv4: can't register ipv4 proto.\n"); + goto cleanup_icmpv4; + } + +#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) + ret = nf_conntrack_ipv4_compat_init(); + if (ret < 0) + goto cleanup_proto; +#endif + return ret; +#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) + cleanup_proto: + nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4); +#endif + cleanup_icmpv4: + nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp); + cleanup_udp4: + nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4); + cleanup_tcp4: + nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4); + cleanup_hooks: + nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); + cleanup_pernet: + unregister_pernet_subsys(&ipv4_net_ops); + cleanup_sockopt: + nf_unregister_sockopt(&so_getorigdst); + return ret; +} + +static void __exit nf_conntrack_l3proto_ipv4_fini(void) +{ + synchronize_net(); +#if defined(CONFIG_PROC_FS) && defined(CONFIG_NF_CONNTRACK_PROC_COMPAT) + nf_conntrack_ipv4_compat_fini(); +#endif + nf_ct_l3proto_unregister(&nf_conntrack_l3proto_ipv4); + nf_ct_l4proto_unregister(&nf_conntrack_l4proto_icmp); + nf_ct_l4proto_unregister(&nf_conntrack_l4proto_udp4); + nf_ct_l4proto_unregister(&nf_conntrack_l4proto_tcp4); + nf_unregister_hooks(ipv4_conntrack_ops, ARRAY_SIZE(ipv4_conntrack_ops)); + unregister_pernet_subsys(&ipv4_net_ops); + nf_unregister_sockopt(&so_getorigdst); +} + +module_init(nf_conntrack_l3proto_ipv4_init); +module_exit(nf_conntrack_l3proto_ipv4_fini); |