From: Dmitry Safonov <dima@arista.com>
To: linux-kernel@vger.kernel.org, David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Paolo Abeni <pabeni@redhat.com>, Jakub Kicinski <kuba@kernel.org>,
"David S. Miller" <davem@davemloft.net>
Cc: Dmitry Safonov <dima@arista.com>,
Andy Lutomirski <luto@amacapital.net>,
Ard Biesheuvel <ardb@kernel.org>,
Bob Gilligan <gilligan@arista.com>,
Dan Carpenter <error27@gmail.com>,
David Laight <David.Laight@aculab.com>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Eric Biggers <ebiggers@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
Francesco Ruggeri <fruggeri05@gmail.com>,
Herbert Xu <herbert@gondor.apana.org.au>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Ivan Delalande <colona@arista.com>,
Leonard Crestez <cdleonard@gmail.com>,
Salam Noureddine <noureddine@arista.com>,
netdev@vger.kernel.org
Subject: [PATCH v6 07/21] net/tcp: Add tcp_parse_auth_options()
Date: Fri, 12 May 2023 21:22:57 +0100 [thread overview]
Message-ID: <20230512202311.2845526-8-dima@arista.com> (raw)
In-Reply-To: <20230512202311.2845526-1-dima@arista.com>
Introduce a helper that:
(1) shares the common code with TCP-MD5 header options parsing
(2) looks for hash signature only once for both TCP-MD5 and TCP-AO
(3) fails with -EEXIST if any TCP sign option is present twice, see
RFC5925 (2.2):
">> A single TCP segment MUST NOT have more than one TCP-AO in its
options sequence. When multiple TCP-AOs appear, TCP MUST discard
the segment."
Co-developed-by: Francesco Ruggeri <fruggeri@arista.com>
Signed-off-by: Francesco Ruggeri <fruggeri@arista.com>
Co-developed-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Salam Noureddine <noureddine@arista.com>
Signed-off-by: Dmitry Safonov <dima@arista.com>
---
include/net/tcp.h | 24 +++++++++++++++++++++++-
include/net/tcp_ao.h | 17 ++++++++++++++++-
net/ipv4/tcp.c | 3 ++-
net/ipv4/tcp_input.c | 39 +++++++++++++++++++++++++++++----------
net/ipv4/tcp_ipv4.c | 15 ++++++++++-----
net/ipv6/tcp_ipv6.c | 11 +++++++----
6 files changed, 87 insertions(+), 22 deletions(-)
diff --git a/include/net/tcp.h b/include/net/tcp.h
index 50d255ac3500..e93f9f0fb464 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -434,7 +434,6 @@ int tcp_mmap(struct file *file, struct socket *sock,
void tcp_parse_options(const struct net *net, const struct sk_buff *skb,
struct tcp_options_received *opt_rx,
int estab, struct tcp_fastopen_cookie *foc);
-const u8 *tcp_parse_md5sig_option(const struct tcphdr *th);
/*
* BPF SKB-less helpers
@@ -2535,6 +2534,29 @@ static inline u64 tcp_transmit_time(const struct sock *sk)
return 0;
}
+static inline int tcp_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const struct tcp_ao_hdr **aoh)
+{
+ const u8 *md5_tmp, *ao_tmp;
+ int ret;
+
+ ret = tcp_do_parse_auth_options(th, &md5_tmp, &ao_tmp);
+ if (ret)
+ return ret;
+
+ if (md5_hash)
+ *md5_hash = md5_tmp;
+
+ if (aoh) {
+ if (!ao_tmp)
+ *aoh = NULL;
+ else
+ *aoh = (struct tcp_ao_hdr *)(ao_tmp - 2);
+ }
+
+ return 0;
+}
+
static inline bool tcp_ao_required(struct sock *sk, const void *saddr,
int family)
{
diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h
index ee32af145bba..72fc87cf58bf 100644
--- a/include/net/tcp_ao.h
+++ b/include/net/tcp_ao.h
@@ -156,7 +156,9 @@ int tcp_v6_parse_ao(struct sock *sk, int cmd,
sockptr_t optval, int optlen);
void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb);
void tcp_ao_connect_init(struct sock *sk);
-
+void tcp_ao_syncookie(struct sock *sk, const struct sk_buff *skb,
+ struct tcp_request_sock *treq,
+ unsigned short int family);
#else /* CONFIG_TCP_AO */
static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
@@ -179,4 +181,17 @@ static inline void tcp_ao_connect_init(struct sock *sk)
}
#endif
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
+int tcp_do_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const u8 **ao_hash);
+#else
+static int tcp_do_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const u8 **ao_hash)
+{
+ *md5_hash = NULL;
+ *ao_hash = NULL;
+ return 0;
+}
+#endif
+
#endif /* _TCP_AO_H */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index fa94d5c416b0..fe30260be4c2 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -4502,7 +4502,8 @@ tcp_inbound_md5_hash(const struct sock *sk, const struct sk_buff *skb,
l3index = sdif ? dif : 0;
hash_expected = tcp_md5_do_lookup(sk, l3index, saddr, family);
- hash_location = tcp_parse_md5sig_option(th);
+ if (tcp_parse_auth_options(th, &hash_location, NULL))
+ return true;
/* We've parsed the options - do we have a hash? */
if (!hash_expected && !hash_location)
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 2a9010b4ac8c..9626c703caed 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -4202,39 +4202,58 @@ static bool tcp_fast_parse_options(const struct net *net,
return true;
}
-#ifdef CONFIG_TCP_MD5SIG
+#if defined(CONFIG_TCP_MD5SIG) || defined(CONFIG_TCP_AO)
/*
- * Parse MD5 Signature option
+ * Parse Signature options
*/
-const u8 *tcp_parse_md5sig_option(const struct tcphdr *th)
+int tcp_do_parse_auth_options(const struct tcphdr *th,
+ const u8 **md5_hash, const u8 **ao_hash)
{
int length = (th->doff << 2) - sizeof(*th);
const u8 *ptr = (const u8 *)(th + 1);
+ unsigned int minlen = TCPOLEN_MD5SIG;
+
+ if (IS_ENABLED(CONFIG_TCP_AO))
+ minlen = sizeof(struct tcp_ao_hdr) + 1;
+
+ *md5_hash = NULL;
+ *ao_hash = NULL;
/* If not enough data remaining, we can short cut */
- while (length >= TCPOLEN_MD5SIG) {
+ while (length >= minlen) {
int opcode = *ptr++;
int opsize;
switch (opcode) {
case TCPOPT_EOL:
- return NULL;
+ return 0;
case TCPOPT_NOP:
length--;
continue;
default:
opsize = *ptr++;
if (opsize < 2 || opsize > length)
- return NULL;
- if (opcode == TCPOPT_MD5SIG)
- return opsize == TCPOLEN_MD5SIG ? ptr : NULL;
+ return -EINVAL;
+ if (opcode == TCPOPT_MD5SIG) {
+ if (opsize != TCPOLEN_MD5SIG)
+ return -EINVAL;
+ if (unlikely(*md5_hash || *ao_hash))
+ return -EEXIST;
+ *md5_hash = ptr;
+ } else if (opcode == TCPOPT_AO) {
+ if (opsize <= sizeof(struct tcp_ao_hdr))
+ return -EINVAL;
+ if (unlikely(*md5_hash || *ao_hash))
+ return -EEXIST;
+ *ao_hash = ptr;
+ }
}
ptr += opsize - 2;
length -= opsize;
}
- return NULL;
+ return 0;
}
-EXPORT_SYMBOL(tcp_parse_md5sig_option);
+EXPORT_SYMBOL(tcp_do_parse_auth_options);
#endif
/* Sorry, PAWS as specified is broken wrt. pure-ACKs -DaveM
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index bd9b9118e1f0..a88465ed5d39 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -668,7 +668,9 @@ EXPORT_SYMBOL(tcp_v4_send_check);
* Exception: precedence violation. We do not implement it in any case.
*/
-#ifdef CONFIG_TCP_MD5SIG
+#ifdef CONFIG_TCP_AO
+#define OPTION_BYTES MAX_TCP_OPTION_SPACE
+#elif defined(CONFIG_TCP_MD5SIG)
#define OPTION_BYTES TCPOLEN_MD5SIG_ALIGNED
#else
#define OPTION_BYTES sizeof(__be32)
@@ -684,7 +686,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
struct ip_reply_arg arg;
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *key = NULL;
- const __u8 *hash_location = NULL;
+ const __u8 *md5_hash_location = NULL;
unsigned char newhash[16];
int genhash;
struct sock *sk1 = NULL;
@@ -724,8 +726,11 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
#ifdef CONFIG_TCP_MD5SIG
+ /* Invalid TCP option size or twice included auth */
+ if (tcp_parse_auth_options(tcp_hdr(skb), &md5_hash_location, NULL))
+ return;
+
rcu_read_lock();
- hash_location = tcp_parse_md5sig_option(th);
if (sk && sk_fullsock(sk)) {
const union tcp_md5_addr *addr;
int l3index;
@@ -736,7 +741,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
- } else if (hash_location) {
+ } else if (md5_hash_location) {
const union tcp_md5_addr *addr;
int sdif = tcp_v4_sdif(skb);
int dif = inet_iif(skb);
@@ -768,7 +773,7 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
genhash = tcp_v4_md5_hash_skb(newhash, key, NULL, skb);
- if (genhash || memcmp(hash_location, newhash, 16) != 0)
+ if (genhash || memcmp(md5_hash_location, newhash, 16) != 0)
goto out;
}
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7ff755e27686..0074d1f1f8a5 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -993,7 +993,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
u32 seq = 0, ack_seq = 0;
struct tcp_md5sig_key *key = NULL;
#ifdef CONFIG_TCP_MD5SIG
- const __u8 *hash_location = NULL;
+ const __u8 *md5_hash_location = NULL;
unsigned char newhash[16];
int genhash;
struct sock *sk1 = NULL;
@@ -1015,8 +1015,11 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
net = sk ? sock_net(sk) : dev_net(skb_dst(skb)->dev);
#ifdef CONFIG_TCP_MD5SIG
+ /* Invalid TCP option size or twice included auth */
+ if (tcp_parse_auth_options(th, &md5_hash_location, NULL))
+ return;
+
rcu_read_lock();
- hash_location = tcp_parse_md5sig_option(th);
if (sk && sk_fullsock(sk)) {
int l3index;
@@ -1025,7 +1028,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
*/
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index);
- } else if (hash_location) {
+ } else if (md5_hash_location) {
int dif = tcp_v6_iif_l3_slave(skb);
int sdif = tcp_v6_sdif(skb);
int l3index;
@@ -1054,7 +1057,7 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
goto out;
genhash = tcp_v6_md5_hash_skb(newhash, key, NULL, skb);
- if (genhash || memcmp(hash_location, newhash, 16) != 0)
+ if (genhash || memcmp(md5_hash_location, newhash, 16) != 0)
goto out;
}
#endif
--
2.40.0
next prev parent reply other threads:[~2023-05-12 20:24 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-12 20:22 [PATCH v6 00/21] net/tcp: Add TCP-AO support Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 01/21] net/tcp: Prepare tcp_md5sig_pool for TCP-AO Dmitry Safonov
2023-05-12 23:23 ` kernel test robot
2023-05-15 4:48 ` Herbert Xu
2023-05-15 16:25 ` Dmitry Safonov
2023-05-16 10:15 ` Herbert Xu
2023-05-19 8:26 ` [PATCH 0/3] crypto: cmac - Add cloning support Herbert Xu
2023-05-19 8:28 ` [PATCH 1/3] crypto: cmac - Use modern init_tfm/exit_tfm Herbert Xu
2023-05-19 8:28 ` [PATCH 2/3] crypto: cipher - Add crypto_clone_cipher Herbert Xu
2023-05-19 13:15 ` Simon Horman
2023-05-19 8:28 ` [PATCH 3/3] crypto: cmac - Add support for cloning Herbert Xu
2023-05-19 8:54 ` Ard Biesheuvel
2023-05-19 9:04 ` [PATCH] crypto: shash - Allow cloning on algorithms with no init_tfm Herbert Xu
2023-05-19 9:31 ` Ard Biesheuvel
2023-05-19 9:35 ` Herbert Xu
2023-05-19 14:41 ` [PATCH 3/3] crypto: cmac - Add support for cloning Dmitry Safonov
2023-05-19 9:49 ` [PATCH 0/3] crypto: cmac - Add cloning support Ard Biesheuvel
2023-05-12 20:22 ` [PATCH v6 02/21] net/tcp: Add TCP-AO config and structures Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 03/21] net/tcp: Introduce TCP_AO setsockopt()s Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 04/21] net/tcp: Prevent TCP-MD5 with TCP-AO being set Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 05/21] net/tcp: Calculate TCP-AO traffic keys Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 06/21] net/tcp: Add TCP-AO sign to outgoing packets Dmitry Safonov
2023-05-12 20:22 ` Dmitry Safonov [this message]
2023-05-12 23:02 ` [PATCH v6 07/21] net/tcp: Add tcp_parse_auth_options() kernel test robot
2023-05-12 20:22 ` [PATCH v6 08/21] net/tcp: Add AO sign to RST packets Dmitry Safonov
2023-05-12 20:22 ` [PATCH v6 09/21] net/tcp: Add TCP-AO sign to twsk Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 10/21] net/tcp: Wire TCP-AO to request sockets Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 11/21] net/tcp: Sign SYN-ACK segments with TCP-AO Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 12/21] net/tcp: Verify inbound TCP-AO signed segments Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 13/21] net/tcp: Add TCP-AO segments counters Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 14/21] net/tcp: Add TCP-AO SNE support Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 15/21] net/tcp: Add tcp_hash_fail() ratelimited logs Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 16/21] net/tcp: Ignore specific ICMPs for TCP-AO connections Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 17/21] net/tcp: Add option for TCP-AO to (not) hash header Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 18/21] net/tcp: Add TCP-AO getsockopt()s Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 19/21] net/tcp: Allow asynchronous delete for TCP-AO keys (MKTs) Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 20/21] net/tcp: Add static_key for TCP-AO Dmitry Safonov
2023-05-12 20:23 ` [PATCH v6 21/21] net/tcp: Wire up l3index to TCP-AO Dmitry Safonov
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