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[TCP]: Add IPv6 support to TCP SYN cookies
Updated to incorporate Eric's suggestion of using a per cpu buffer rather than allocating on the stack. Just a two line change, but will resend in it's entirety. Signed-off-by: Glenn Griffin <ggriffin.kernel@gmail.com> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
Glenn Griffin
YOSHIFUJI Hideaki
parent
11baab7ac3
commit
c6aefafb7e
@ -29,6 +29,7 @@
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#include <linux/skbuff.h>
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#include <linux/dmaengine.h>
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#include <linux/crypto.h>
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#include <linux/cryptohash.h>
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#include <net/inet_connection_sock.h>
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#include <net/inet_timewait_sock.h>
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@ -434,11 +435,17 @@ extern int tcp_disconnect(struct sock *sk, int flags);
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extern void tcp_unhash(struct sock *sk);
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/* From syncookies.c */
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extern __u32 syncookie_secret[2][16-3+SHA_DIGEST_WORDS];
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extern struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
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struct ip_options *opt);
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extern __u32 cookie_v4_init_sequence(struct sock *sk, struct sk_buff *skb,
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__u16 *mss);
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/* From net/ipv6/syncookies.c */
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extern struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb);
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extern __u32 cookie_v6_init_sequence(struct sock *sk, struct sk_buff *skb,
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__u16 *mss);
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/* tcp_output.c */
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extern void __tcp_push_pending_frames(struct sock *sk, unsigned int cur_mss,
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@ -1332,6 +1339,7 @@ extern int tcp_proc_register(struct tcp_seq_afinfo *afinfo);
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extern void tcp_proc_unregister(struct tcp_seq_afinfo *afinfo);
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extern struct request_sock_ops tcp_request_sock_ops;
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extern struct request_sock_ops tcp6_request_sock_ops;
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extern int tcp_v4_destroy_sock(struct sock *sk);
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@ -10,8 +10,6 @@
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* 2 of the License, or (at your option) any later version.
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*
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* $Id: syncookies.c,v 1.18 2002/02/01 22:01:04 davem Exp $
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*
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* Missing: IPv6 support.
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*/
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#include <linux/tcp.h>
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@ -23,14 +21,15 @@
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extern int sysctl_tcp_syncookies;
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static __u32 syncookie_secret[2][16-3+SHA_DIGEST_WORDS];
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__u32 syncookie_secret[2][16-3+SHA_DIGEST_WORDS];
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EXPORT_SYMBOL(syncookie_secret);
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static __init int init_syncookies(void)
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{
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get_random_bytes(syncookie_secret, sizeof(syncookie_secret));
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return 0;
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}
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module_init(init_syncookies);
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__initcall(init_syncookies);
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#define COOKIEBITS 24 /* Upper bits store count */
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#define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)
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@ -5326,6 +5326,7 @@ discard:
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EXPORT_SYMBOL(sysctl_tcp_ecn);
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EXPORT_SYMBOL(sysctl_tcp_reordering);
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EXPORT_SYMBOL(sysctl_tcp_adv_win_scale);
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EXPORT_SYMBOL(tcp_parse_options);
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EXPORT_SYMBOL(tcp_rcv_established);
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EXPORT_SYMBOL(tcp_rcv_state_process);
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@ -35,6 +35,8 @@
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#endif
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int sysctl_tcp_syncookies __read_mostly = SYNC_INIT;
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EXPORT_SYMBOL(sysctl_tcp_syncookies);
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int sysctl_tcp_abort_on_overflow __read_mostly;
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struct inet_timewait_death_row tcp_death_row = {
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@ -2560,6 +2560,7 @@ void tcp_send_probe0(struct sock *sk)
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}
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}
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EXPORT_SYMBOL(tcp_select_initial_window);
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EXPORT_SYMBOL(tcp_connect);
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EXPORT_SYMBOL(tcp_make_synack);
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EXPORT_SYMBOL(tcp_simple_retransmit);
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@ -16,6 +16,7 @@ ipv6-$(CONFIG_XFRM) += xfrm6_policy.o xfrm6_state.o xfrm6_input.o \
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ipv6-$(CONFIG_NETFILTER) += netfilter.o
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ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
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ipv6-$(CONFIG_PROC_FS) += proc.o
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ipv6-$(CONFIG_SYN_COOKIES) += syncookies.o
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ipv6-objs += $(ipv6-y)
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267
net/ipv6/syncookies.c
Normal file
267
net/ipv6/syncookies.c
Normal file
@ -0,0 +1,267 @@
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/*
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* IPv6 Syncookies implementation for the Linux kernel
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*
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* Authors:
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* Glenn Griffin <ggriffin.kernel@gmail.com>
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*
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* Based on IPv4 implementation by Andi Kleen
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* linux/net/ipv4/syncookies.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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*/
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#include <linux/tcp.h>
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#include <linux/random.h>
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#include <linux/cryptohash.h>
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#include <linux/kernel.h>
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#include <net/ipv6.h>
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#include <net/tcp.h>
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extern int sysctl_tcp_syncookies;
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extern __u32 syncookie_secret[2][16-3+SHA_DIGEST_WORDS];
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#define COOKIEBITS 24 /* Upper bits store count */
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#define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)
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/*
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* This table has to be sorted and terminated with (__u16)-1.
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* XXX generate a better table.
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* Unresolved Issues: HIPPI with a 64k MSS is not well supported.
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*
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* Taken directly from ipv4 implementation.
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* Should this list be modified for ipv6 use or is it close enough?
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* rfc 2460 8.3 suggests mss values 20 bytes less than ipv4 counterpart
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*/
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static __u16 const msstab[] = {
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64 - 1,
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256 - 1,
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512 - 1,
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536 - 1,
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1024 - 1,
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1440 - 1,
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1460 - 1,
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4312 - 1,
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(__u16)-1
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};
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/* The number doesn't include the -1 terminator */
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#define NUM_MSS (ARRAY_SIZE(msstab) - 1)
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/*
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* This (misnamed) value is the age of syncookie which is permitted.
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* Its ideal value should be dependent on TCP_TIMEOUT_INIT and
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* sysctl_tcp_retries1. It's a rather complicated formula (exponential
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* backoff) to compute at runtime so it's currently hardcoded here.
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*/
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#define COUNTER_TRIES 4
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static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
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struct request_sock *req,
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struct dst_entry *dst)
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{
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struct inet_connection_sock *icsk = inet_csk(sk);
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struct sock *child;
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child = icsk->icsk_af_ops->syn_recv_sock(sk, skb, req, dst);
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if (child)
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inet_csk_reqsk_queue_add(sk, req, child);
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else
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reqsk_free(req);
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return child;
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}
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static DEFINE_PER_CPU(__u32, cookie_scratch)[16 + 5 + SHA_WORKSPACE_WORDS];
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static u32 cookie_hash(struct in6_addr *saddr, struct in6_addr *daddr,
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__be16 sport, __be16 dport, u32 count, int c)
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{
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__u32 *tmp = __get_cpu_var(cookie_scratch);
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/*
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* we have 320 bits of information to hash, copy in the remaining
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* 192 bits required for sha_transform, from the syncookie_secret
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* and overwrite the digest with the secret
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*/
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memcpy(tmp + 10, syncookie_secret[c], 44);
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memcpy(tmp, saddr, 16);
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memcpy(tmp + 4, daddr, 16);
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tmp[8] = ((__force u32)sport << 16) + (__force u32)dport;
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tmp[9] = count;
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sha_transform(tmp + 16, (__u8 *)tmp, tmp + 16 + 5);
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return tmp[17];
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}
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static __u32 secure_tcp_syn_cookie(struct in6_addr *saddr, struct in6_addr *daddr,
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__be16 sport, __be16 dport, __u32 sseq,
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__u32 count, __u32 data)
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{
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return (cookie_hash(saddr, daddr, sport, dport, 0, 0) +
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sseq + (count << COOKIEBITS) +
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((cookie_hash(saddr, daddr, sport, dport, count, 1) + data)
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& COOKIEMASK));
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}
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static __u32 check_tcp_syn_cookie(__u32 cookie, struct in6_addr *saddr,
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struct in6_addr *daddr, __be16 sport,
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__be16 dport, __u32 sseq, __u32 count,
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__u32 maxdiff)
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{
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__u32 diff;
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cookie -= cookie_hash(saddr, daddr, sport, dport, 0, 0) + sseq;
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diff = (count - (cookie >> COOKIEBITS)) & ((__u32) -1 >> COOKIEBITS);
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if (diff >= maxdiff)
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return (__u32)-1;
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return (cookie -
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cookie_hash(saddr, daddr, sport, dport, count - diff, 1))
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& COOKIEMASK;
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}
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__u32 cookie_v6_init_sequence(struct sock *sk, struct sk_buff *skb, __u16 *mssp)
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{
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struct ipv6hdr *iph = ipv6_hdr(skb);
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const struct tcphdr *th = tcp_hdr(skb);
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int mssind;
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const __u16 mss = *mssp;
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tcp_sk(sk)->last_synq_overflow = jiffies;
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for (mssind = 0; mss > msstab[mssind + 1]; mssind++)
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;
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*mssp = msstab[mssind] + 1;
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NET_INC_STATS_BH(LINUX_MIB_SYNCOOKIESSENT);
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return secure_tcp_syn_cookie(&iph->saddr, &iph->daddr, th->source,
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th->dest, ntohl(th->seq),
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jiffies / (HZ * 60), mssind);
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}
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static inline int cookie_check(struct sk_buff *skb, __u32 cookie)
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{
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struct ipv6hdr *iph = ipv6_hdr(skb);
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const struct tcphdr *th = tcp_hdr(skb);
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__u32 seq = ntohl(th->seq) - 1;
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__u32 mssind = check_tcp_syn_cookie(cookie, &iph->saddr, &iph->daddr,
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th->source, th->dest, seq,
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jiffies / (HZ * 60), COUNTER_TRIES);
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return mssind < NUM_MSS ? msstab[mssind] + 1 : 0;
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}
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struct sock *cookie_v6_check(struct sock *sk, struct sk_buff *skb)
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{
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struct inet_request_sock *ireq;
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struct inet6_request_sock *ireq6;
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struct tcp_request_sock *treq;
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct tcp_sock *tp = tcp_sk(sk);
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const struct tcphdr *th = tcp_hdr(skb);
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__u32 cookie = ntohl(th->ack_seq) - 1;
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struct sock *ret = sk;
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struct request_sock *req;
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int mss;
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struct dst_entry *dst;
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__u8 rcv_wscale;
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if (!sysctl_tcp_syncookies || !th->ack)
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goto out;
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if (time_after(jiffies, tp->last_synq_overflow + TCP_TIMEOUT_INIT) ||
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(mss = cookie_check(skb, cookie)) == 0) {
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NET_INC_STATS_BH(LINUX_MIB_SYNCOOKIESFAILED);
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goto out;
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}
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NET_INC_STATS_BH(LINUX_MIB_SYNCOOKIESRECV);
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ret = NULL;
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req = inet6_reqsk_alloc(&tcp6_request_sock_ops);
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if (!req)
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goto out;
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ireq = inet_rsk(req);
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ireq6 = inet6_rsk(req);
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treq = tcp_rsk(req);
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ireq6->pktopts = NULL;
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if (security_inet_conn_request(sk, skb, req)) {
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reqsk_free(req);
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goto out;
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}
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req->mss = mss;
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ireq->rmt_port = th->source;
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ipv6_addr_copy(&ireq6->rmt_addr, &ipv6_hdr(skb)->saddr);
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ipv6_addr_copy(&ireq6->loc_addr, &ipv6_hdr(skb)->daddr);
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if (ipv6_opt_accepted(sk, skb) ||
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np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
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np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
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atomic_inc(&skb->users);
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ireq6->pktopts = skb;
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}
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ireq6->iif = sk->sk_bound_dev_if;
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/* So that link locals have meaning */
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if (!sk->sk_bound_dev_if &&
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ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
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ireq6->iif = inet6_iif(skb);
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req->expires = 0UL;
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req->retrans = 0;
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ireq->snd_wscale = ireq->rcv_wscale = ireq->tstamp_ok = 0;
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ireq->wscale_ok = ireq->sack_ok = 0;
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treq->rcv_isn = ntohl(th->seq) - 1;
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treq->snt_isn = cookie;
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/*
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* We need to lookup the dst_entry to get the correct window size.
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* This is taken from tcp_v6_syn_recv_sock. Somebody please enlighten
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* me if there is a preferred way.
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*/
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{
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struct in6_addr *final_p = NULL, final;
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struct flowi fl;
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memset(&fl, 0, sizeof(fl));
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fl.proto = IPPROTO_TCP;
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ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
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if (np->opt && np->opt->srcrt) {
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struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
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ipv6_addr_copy(&final, &fl.fl6_dst);
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ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
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final_p = &final;
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}
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ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
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fl.oif = sk->sk_bound_dev_if;
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fl.fl_ip_dport = inet_rsk(req)->rmt_port;
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fl.fl_ip_sport = inet_sk(sk)->sport;
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security_req_classify_flow(req, &fl);
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if (ip6_dst_lookup(sk, &dst, &fl)) {
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reqsk_free(req);
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goto out;
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}
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if (final_p)
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ipv6_addr_copy(&fl.fl6_dst, final_p);
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if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
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goto out;
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}
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req->window_clamp = dst_metric(dst, RTAX_WINDOW);
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tcp_select_initial_window(tcp_full_space(sk), req->mss,
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&req->rcv_wnd, &req->window_clamp,
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0, &rcv_wscale);
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ireq->rcv_wscale = rcv_wscale;
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ret = get_cookie_sock(sk, skb, req, dst);
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out: return ret;
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}
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@ -512,6 +512,20 @@ done:
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return err;
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}
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static inline void syn_flood_warning(struct sk_buff *skb)
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{
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#ifdef CONFIG_SYN_COOKIES
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if (sysctl_tcp_syncookies)
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printk(KERN_INFO
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"TCPv6: Possible SYN flooding on port %d. "
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"Sending cookies.\n", ntohs(tcp_hdr(skb)->dest));
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else
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#endif
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printk(KERN_INFO
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"TCPv6: Possible SYN flooding on port %d. "
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"Dropping request.\n", ntohs(tcp_hdr(skb)->dest));
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}
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static void tcp_v6_reqsk_destructor(struct request_sock *req)
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{
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if (inet6_rsk(req)->pktopts)
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@ -915,7 +929,7 @@ done_opts:
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}
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#endif
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static struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
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struct request_sock_ops tcp6_request_sock_ops __read_mostly = {
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.family = AF_INET6,
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.obj_size = sizeof(struct tcp6_request_sock),
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.rtx_syn_ack = tcp_v6_send_synack,
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@ -1213,9 +1227,9 @@ static struct sock *tcp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
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return NULL;
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}
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#if 0 /*def CONFIG_SYN_COOKIES*/
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#ifdef CONFIG_SYN_COOKIES
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if (!th->rst && !th->syn && th->ack)
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sk = cookie_v6_check(sk, skb, &(IPCB(skb)->opt));
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sk = cookie_v6_check(sk, skb);
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#endif
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return sk;
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}
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@ -1231,6 +1245,11 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
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struct tcp_sock *tp = tcp_sk(sk);
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struct request_sock *req = NULL;
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__u32 isn = TCP_SKB_CB(skb)->when;
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#ifdef CONFIG_SYN_COOKIES
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int want_cookie = 0;
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#else
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#define want_cookie 0
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#endif
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if (skb->protocol == htons(ETH_P_IP))
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return tcp_v4_conn_request(sk, skb);
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@ -1238,12 +1257,14 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
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if (!ipv6_unicast_destination(skb))
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goto drop;
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/*
|
||||
* There are no SYN attacks on IPv6, yet...
|
||||
*/
|
||||
if (inet_csk_reqsk_queue_is_full(sk) && !isn) {
|
||||
if (net_ratelimit())
|
||||
printk(KERN_INFO "TCPv6: dropping request, synflood is possible\n");
|
||||
syn_flood_warning(skb);
|
||||
#ifdef CONFIG_SYN_COOKIES
|
||||
if (sysctl_tcp_syncookies)
|
||||
want_cookie = 1;
|
||||
else
|
||||
#endif
|
||||
goto drop;
|
||||
}
|
||||
|
||||
@ -1264,29 +1285,39 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
|
||||
|
||||
tcp_parse_options(skb, &tmp_opt, 0);
|
||||
|
||||
if (want_cookie) {
|
||||
tcp_clear_options(&tmp_opt);
|
||||
tmp_opt.saw_tstamp = 0;
|
||||
}
|
||||
|
||||
tmp_opt.tstamp_ok = tmp_opt.saw_tstamp;
|
||||
tcp_openreq_init(req, &tmp_opt, skb);
|
||||
|
||||
treq = inet6_rsk(req);
|
||||
ipv6_addr_copy(&treq->rmt_addr, &ipv6_hdr(skb)->saddr);
|
||||
ipv6_addr_copy(&treq->loc_addr, &ipv6_hdr(skb)->daddr);
|
||||
TCP_ECN_create_request(req, tcp_hdr(skb));
|
||||
treq->pktopts = NULL;
|
||||
if (ipv6_opt_accepted(sk, skb) ||
|
||||
np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
|
||||
np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
|
||||
atomic_inc(&skb->users);
|
||||
treq->pktopts = skb;
|
||||
}
|
||||
treq->iif = sk->sk_bound_dev_if;
|
||||
if (!want_cookie)
|
||||
TCP_ECN_create_request(req, tcp_hdr(skb));
|
||||
|
||||
/* So that link locals have meaning */
|
||||
if (!sk->sk_bound_dev_if &&
|
||||
ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
|
||||
treq->iif = inet6_iif(skb);
|
||||
if (want_cookie) {
|
||||
isn = cookie_v6_init_sequence(sk, skb, &req->mss);
|
||||
} else if (!isn) {
|
||||
if (ipv6_opt_accepted(sk, skb) ||
|
||||
np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
|
||||
np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
|
||||
atomic_inc(&skb->users);
|
||||
treq->pktopts = skb;
|
||||
}
|
||||
treq->iif = sk->sk_bound_dev_if;
|
||||
|
||||
/* So that link locals have meaning */
|
||||
if (!sk->sk_bound_dev_if &&
|
||||
ipv6_addr_type(&treq->rmt_addr) & IPV6_ADDR_LINKLOCAL)
|
||||
treq->iif = inet6_iif(skb);
|
||||
|
||||
if (isn == 0)
|
||||
isn = tcp_v6_init_sequence(skb);
|
||||
}
|
||||
|
||||
tcp_rsk(req)->snt_isn = isn;
|
||||
|
||||
@ -1295,8 +1326,10 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
|
||||
if (tcp_v6_send_synack(sk, req))
|
||||
goto drop;
|
||||
|
||||
inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
|
||||
return 0;
|
||||
if (!want_cookie) {
|
||||
inet6_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
|
||||
return 0;
|
||||
}
|
||||
|
||||
drop:
|
||||
if (req)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user