diff mbox series

[v6,16/26] tcp: authopt: Add NOSEND/NORECV flags

Message ID 42a151fcdbae9ccbcfe5916324d40c904f98d9b2.1658815925.git.cdleonard@gmail.com (mailing list archive)
State Deferred
Delegated to: Netdev Maintainers
Headers show
Series tcp: Initial support for RFC5925 auth option | expand

Checks

Context Check Description
netdev/tree_selection success Guessed tree name to be net-next, async
netdev/fixes_present success Fixes tag not required for -next series
netdev/subject_prefix warning Target tree name not specified in the subject
netdev/cover_letter success Series has a cover letter
netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 2185 this patch: 2185
netdev/cc_maintainers warning 1 maintainers not CCed: pabeni@redhat.com
netdev/build_clang success Errors and warnings before: 580 this patch: 580
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 2313 this patch: 2313
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 43 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Leonard Crestez July 26, 2022, 6:15 a.m. UTC
Add flags to allow marking individual keys and invalid for send or recv.
Making keys assymetric this way is not mentioned in RFC5925 but RFC8177
requires that keys inside a keychain have independent "accept" and
"send" lifetimes.

Flag names are negative so that the default behavior is for keys to be
valid for both send and recv.

Setting both NOSEND and NORECV for a certain peer address can be used on
a listen socket can be used to mean "TCP-AO is required from this peer
but no keys are currently valid".

Signed-off-by: Leonard Crestez <cdleonard@gmail.com>
---
 include/uapi/linux/tcp.h | 4 ++++
 net/ipv4/tcp_authopt.c   | 9 ++++++++-
 2 files changed, 12 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h
index a7f5f918ed5a..ed27feb93b0e 100644
--- a/include/uapi/linux/tcp.h
+++ b/include/uapi/linux/tcp.h
@@ -401,16 +401,20 @@  struct tcp_authopt {
  *
  * @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`
+ * @TCP_AUTHOPT_KEY_NOSEND: Key invalid for send (expired)
+ * @TCP_AUTHOPT_KEY_NORECV: Key invalid for recv (expired)
  */
 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),
+	TCP_AUTHOPT_KEY_NOSEND = (1 << 4),
+	TCP_AUTHOPT_KEY_NORECV = (1 << 5),
 };
 
 /**
  * enum tcp_authopt_alg - Algorithms for TCP Authentication Option
  */
diff --git a/net/ipv4/tcp_authopt.c b/net/ipv4/tcp_authopt.c
index bb26fb1c8af2..0ead961fcfe0 100644
--- a/net/ipv4/tcp_authopt.c
+++ b/net/ipv4/tcp_authopt.c
@@ -374,10 +374,12 @@  static struct tcp_authopt_key_info *tcp_authopt_lookup_send(struct netns_tcp_aut
 	int l3index = -1;
 
 	hlist_for_each_entry_rcu(key, &net->head, node, 0) {
 		if (send_id >= 0 && key->send_id != send_id)
 			continue;
+		if (key->flags & TCP_AUTHOPT_KEY_NOSEND)
+			continue;
 		if (key->flags & TCP_AUTHOPT_KEY_ADDR_BIND)
 			if (!tcp_authopt_key_match_sk_addr(key, addr_sk))
 				continue;
 		if (key->flags & TCP_AUTHOPT_KEY_IFINDEX) {
 			if (l3index < 0)
@@ -623,11 +625,13 @@  int tcp_get_authopt_val(struct sock *sk, struct tcp_authopt *opt)
 
 #define TCP_AUTHOPT_KEY_KNOWN_FLAGS ( \
 	TCP_AUTHOPT_KEY_DEL | \
 	TCP_AUTHOPT_KEY_EXCLUDE_OPTS | \
 	TCP_AUTHOPT_KEY_ADDR_BIND | \
-	TCP_AUTHOPT_KEY_IFINDEX)
+	TCP_AUTHOPT_KEY_IFINDEX | \
+	TCP_AUTHOPT_KEY_NOSEND | \
+	TCP_AUTHOPT_KEY_NORECV)
 
 int tcp_set_authopt_key(struct sock *sk, sockptr_t optval, unsigned int optlen)
 {
 	struct tcp_authopt_key opt;
 	struct tcp_authopt_info *info;
@@ -1534,10 +1538,13 @@  static struct tcp_authopt_key_info *tcp_authopt_lookup_recv(struct sock *sk,
 
 			if (l3index != key->l3index)
 				continue;
 		}
 		*anykey = true;
+		// If only keys with norecv flag are present still consider that
+		if (key->flags & TCP_AUTHOPT_KEY_NORECV)
+			continue;
 		if (recv_id >= 0 && key->recv_id != recv_id)
 			continue;
 		if (better_key_match(result, key))
 			result = key;
 		else if (result)