From: Leonard Crestez <cdleonard@gmail.com>
To: David Ahern <dsahern@kernel.org>,
Dmitry Safonov <0x7f454c46@gmail.com>,
Eric Dumazet <edumazet@google.com>
Cc: Francesco Ruggeri <fruggeri@arista.com>,
Shuah Khan <shuah@kernel.org>,
"David S. Miller" <davem@davemloft.net>,
Herbert Xu <herbert@gondor.apana.org.au>,
Kuniyuki Iwashima <kuniyu@amazon.co.jp>,
Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org>,
Jakub Kicinski <kuba@kernel.org>,
Yuchung Cheng <ycheng@google.com>,
Mat Martineau <mathew.j.martineau@linux.intel.com>,
Christoph Paasch <cpaasch@apple.com>,
Ivan Delalande <colona@arista.com>,
Priyaranjan Jha <priyarjha@google.com>,
netdev@vger.kernel.org, linux-crypto@vger.kernel.org,
linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 13/18] tcp: authopt: Add initial l3index support
Date: Wed, 8 Dec 2021 13:37:28 +0200 [thread overview]
Message-ID: <a61b0227dd1ad83b05e67ae55df48c704c2b5396.1638962992.git.cdleonard@gmail.com> (raw)
In-Reply-To: <cover.1638962992.git.cdleonard@gmail.com>
This is a parallel feature to tcp_md5sig.tcpm_ifindex support and allows
applications to server multiple VRFs with a single socket.
The ifindex argument must be the ifindex of a VRF device and must match
exactly, keys with ifindex == 0 (outside of VRF) will not match for
connections inside a VRF.
Keys without the TCP_AUTHOPT_KEY_IFINDEX will ignore ifindex and match
both inside and outside VRF.
Signed-off-by: Leonard Crestez <cdleonard@gmail.com>
---
include/net/tcp_authopt.h | 2 ++
include/uapi/linux/tcp.h | 11 ++++++
net/ipv4/tcp_authopt.c | 71 ++++++++++++++++++++++++++++++++++++---
3 files changed, 79 insertions(+), 5 deletions(-)
diff --git a/include/net/tcp_authopt.h b/include/net/tcp_authopt.h
index 020637265ce9..e57bc732f737 100644
--- a/include/net/tcp_authopt.h
+++ b/include/net/tcp_authopt.h
@@ -39,10 +39,12 @@ struct tcp_authopt_key_info {
u8 alg_id;
/** @keylen: Same as &tcp_authopt_key.keylen */
u8 keylen;
/** @key: Same as &tcp_authopt_key.key */
u8 key[TCP_AUTHOPT_MAXKEYLEN];
+ /** @l3index: Same as &tcp_authopt_key.ifindex */
+ int l3index;
/** @addr: Same as &tcp_authopt_key.addr */
struct sockaddr_storage addr;
/** @alg: Algorithm implementation matching alg_id */
struct tcp_authopt_alg_imp *alg;
};
diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index e02176390519..a7f5f918ed5a 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -400,15 +400,17 @@ struct tcp_authopt {
* enum tcp_authopt_key_flag - flags for `tcp_authopt.flags`
*
* @TCP_AUTHOPT_KEY_DEL: Delete the key and ignore non-id fields
* @TCP_AUTHOPT_KEY_EXCLUDE_OPTS: Exclude TCP options from signature
* @TCP_AUTHOPT_KEY_ADDR_BIND: Key only valid for `tcp_authopt.addr`
+ * @TCP_AUTHOPT_KEY_IFINDEX: Key only valid for `tcp_authopt.ifindex`
*/
enum tcp_authopt_key_flag {
TCP_AUTHOPT_KEY_DEL = (1 << 0),
TCP_AUTHOPT_KEY_EXCLUDE_OPTS = (1 << 1),
TCP_AUTHOPT_KEY_ADDR_BIND = (1 << 2),
+ TCP_AUTHOPT_KEY_IFINDEX = (1 << 3),
};
/**
* enum tcp_authopt_alg - Algorithms for TCP Authentication Option
*/
@@ -450,10 +452,19 @@ struct tcp_authopt_key {
* @addr: Key is only valid for this address
*
* Ignored unless TCP_AUTHOPT_KEY_ADDR_BIND flag is set
*/
struct __kernel_sockaddr_storage addr;
+ /**
+ * @ifindex: ifindex of vrf (l3mdev_master) interface
+ *
+ * If the TCP_AUTHOPT_KEY_IFINDEX flag is set then key only applies for
+ * connections through this interface. Interface must be an vrf master.
+ *
+ * This is similar to `tcp_msg5sig.tcpm_ifindex`
+ */
+ int ifindex;
};
/* setsockopt(fd, IPPROTO_TCP, TCP_ZEROCOPY_RECEIVE, ...) */
#define TCP_RECEIVE_ZEROCOPY_FLAG_TLB_CLEAN_HINT 0x1
diff --git a/net/ipv4/tcp_authopt.c b/net/ipv4/tcp_authopt.c
index a8950c9a7e84..b3fd12fcb948 100644
--- a/net/ipv4/tcp_authopt.c
+++ b/net/ipv4/tcp_authopt.c
@@ -1,7 +1,8 @@
// SPDX-License-Identifier: GPL-2.0-or-later
+#include "linux/net.h"
#include <linux/kernel.h>
#include <net/tcp.h>
#include <net/tcp_authopt.h>
#include <crypto/hash.h>
@@ -214,10 +215,14 @@ static bool tcp_authopt_key_match_exact(struct tcp_authopt_key_info *info,
{
if (info->send_id != key->send_id)
return false;
if (info->recv_id != key->recv_id)
return false;
+ if ((info->flags & TCP_AUTHOPT_KEY_IFINDEX) != (key->flags & TCP_AUTHOPT_KEY_IFINDEX))
+ return false;
+ if ((info->flags & TCP_AUTHOPT_KEY_IFINDEX) && info->l3index != key->ifindex)
+ return false;
if ((info->flags & TCP_AUTHOPT_KEY_ADDR_BIND) != (key->flags & TCP_AUTHOPT_KEY_ADDR_BIND))
return false;
if (info->flags & TCP_AUTHOPT_KEY_ADDR_BIND)
if (!ipvx_addr_match(&info->addr, &key->addr))
return false;
@@ -281,26 +286,49 @@ static struct tcp_authopt_key_info *tcp_authopt_key_lookup_exact(const struct so
return key_info;
return NULL;
}
+static bool better_key_match(struct tcp_authopt_key_info *old, struct tcp_authopt_key_info *new)
+{
+ if (!old)
+ return true;
+
+ /* l3index always overrides non-l3index */
+ if (old->l3index && new->l3index == 0)
+ return false;
+ if (old->l3index == 0 && new->l3index)
+ return true;
+
+ return false;
+}
+
static struct tcp_authopt_key_info *tcp_authopt_lookup_send(struct tcp_authopt_info *info,
const struct sock *addr_sk,
int send_id)
{
struct tcp_authopt_key_info *result = NULL;
struct tcp_authopt_key_info *key;
+ int l3index = -1;
hlist_for_each_entry_rcu(key, &info->head, node, 0) {
if (send_id >= 0 && key->send_id != send_id)
continue;
if (key->flags & TCP_AUTHOPT_KEY_ADDR_BIND)
if (!tcp_authopt_key_match_sk_addr(key, addr_sk))
continue;
- if (result && net_ratelimit())
- pr_warn("ambiguous tcp authentication keys configured for send\n");
- result = key;
+ if (key->flags & TCP_AUTHOPT_KEY_IFINDEX) {
+ if (l3index < 0)
+ l3index = l3mdev_master_ifindex_by_index(sock_net(addr_sk),
+ addr_sk->sk_bound_dev_if);
+ if (l3index != key->l3index)
+ continue;
+ }
+ if (better_key_match(result, key))
+ result = key;
+ else if (result)
+ net_warn_ratelimited("ambiguous tcp authentication keys configured for send\n");
}
return result;
}
@@ -564,18 +592,20 @@ void tcp_authopt_clear(struct sock *sk)
}
#define TCP_AUTHOPT_KEY_KNOWN_FLAGS ( \
TCP_AUTHOPT_KEY_DEL | \
TCP_AUTHOPT_KEY_EXCLUDE_OPTS | \
- TCP_AUTHOPT_KEY_ADDR_BIND)
+ TCP_AUTHOPT_KEY_ADDR_BIND | \
+ TCP_AUTHOPT_KEY_IFINDEX)
int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen)
{
struct tcp_authopt_key opt;
struct tcp_authopt_info *info;
struct tcp_authopt_key_info *key_info, *old_key_info;
struct tcp_authopt_alg_imp *alg;
+ int l3index = 0;
int err;
sock_owned_by_me(sk);
err = check_sysctl_tcp_authopt();
if (err)
@@ -622,10 +652,24 @@ int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen)
return -EINVAL;
err = tcp_authopt_alg_require(alg);
if (err)
return err;
+ /* check ifindex is valid (zero is always valid) */
+ if (opt.flags & TCP_AUTHOPT_KEY_IFINDEX && opt.ifindex) {
+ struct net_device *dev;
+
+ rcu_read_lock();
+ dev = dev_get_by_index_rcu(sock_net(sk), opt.ifindex);
+ if (dev && netif_is_l3_master(dev))
+ l3index = dev->ifindex;
+ rcu_read_unlock();
+
+ if (!l3index)
+ return -EINVAL;
+ }
+
key_info = sock_kmalloc(sk, sizeof(*key_info), GFP_KERNEL | __GFP_ZERO);
if (!key_info)
return -ENOMEM;
/* If an old key exists with exact ID then remove and replace.
* RCU-protected readers might observe both and pick any.
@@ -639,10 +683,11 @@ int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen)
key_info->alg_id = opt.alg;
key_info->alg = alg;
key_info->keylen = opt.keylen;
memcpy(key_info->key, opt.key, opt.keylen);
memcpy(&key_info->addr, &opt.addr, sizeof(key_info->addr));
+ key_info->l3index = l3index;
hlist_add_head_rcu(&key_info->node, &info->head);
return 0;
}
@@ -1427,21 +1472,37 @@ static struct tcp_authopt_key_info *tcp_authopt_lookup_recv(struct sock *sk,
int recv_id,
bool *anykey)
{
struct tcp_authopt_key_info *result = NULL;
struct tcp_authopt_key_info *key;
+ int l3index = -1;
*anykey = false;
/* multiple matches will cause occasional failures */
hlist_for_each_entry_rcu(key, &info->head, node, 0) {
if (key->flags & TCP_AUTHOPT_KEY_ADDR_BIND &&
!tcp_authopt_key_match_skb_addr(key, skb))
continue;
+ if (key->flags & TCP_AUTHOPT_KEY_IFINDEX) {
+ if (l3index < 0) {
+ if (skb->protocol == htons(ETH_P_IP)) {
+ l3index = inet_sdif(skb) ? inet_iif(skb) : 0;
+ } else if (skb->protocol == htons(ETH_P_IPV6)) {
+ l3index = inet6_sdif(skb) ? inet6_iif(skb) : 0;
+ } else {
+ WARN_ONCE(1, "unexpected skb->protocol=%x", skb->protocol);
+ continue;
+ }
+ }
+
+ if (l3index != key->l3index)
+ continue;
+ }
*anykey = true;
if (recv_id >= 0 && key->recv_id != recv_id)
continue;
- if (!result)
+ if (better_key_match(result, key))
result = key;
else if (result)
net_warn_ratelimited("ambiguous tcp authentication keys configured for recv\n");
}
--
2.25.1
next prev parent reply other threads:[~2021-12-08 11:40 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-08 11:37 [PATCH v3 00/18] tcp: Initial support for RFC5925 auth option Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 01/18] tcp: authopt: Initial support and key management Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 02/18] docs: Add user documentation for tcp_authopt Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 03/18] tcp: authopt: Add crypto initialization Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 04/18] tcp: md5: Refactor tcp_sig_hash_skb_data for AO Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 05/18] tcp: authopt: Compute packet signatures Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 06/18] tcp: authopt: Hook into tcp core Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 07/18] tcp: authopt: Disable via sysctl by default Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 08/18] tcp: authopt: Implement Sequence Number Extension Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 09/18] tcp: ipv6: Add AO signing for tcp_v6_send_response Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 10/18] tcp: authopt: Add support for signing skb-less replies Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 11/18] tcp: ipv4: Add AO signing for " Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 12/18] tcp: authopt: Add key selection controls Leonard Crestez
2021-12-08 11:37 ` Leonard Crestez [this message]
2021-12-08 11:37 ` [PATCH v3 14/18] tcp: authopt: Add NOSEND/NORECV flags Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 15/18] tcp: authopt: Add prefixlen support Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 16/18] selftests: nettest: Rename md5_prefix to key_addr_prefix Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 17/18] selftests: nettest: Initial tcp_authopt support Leonard Crestez
2021-12-08 11:37 ` [PATCH v3 18/18] selftests: net/fcnal: " Leonard Crestez
2021-12-13 10:31 ` [PATCH v3 00/18] tcp: Initial support for RFC5925 auth option Leonard Crestez
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