Add helpers to determine if an inany is loopback, unspecified or multicast,
regardless of whether it's a "true" IPv6 address or an IPv4 address
represented as v4-mapped.
Sometimes we need to know if an inany is a loopback address, unspecified or
some other particular kind of address, but we don't really care if it is
IPv4.
Use the loopback helper to simplify tcp_splice_conn_from_sock() slightly.
Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
inany.h | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
tcp_splice.c | 15 +++------------
2 files changed, 53 insertions(+), 12 deletions(-)
diff --git a/inany.h b/inany.h
index fe652ff7..2058f145 100644
--- a/inany.h
+++ b/inany.h
@@ -55,6 +55,56 @@ static inline bool inany_equals(const union inany_addr *a,
return IN6_ARE_ADDR_EQUAL(&a->a6, &b->a6);
}
+/** inany_is_loopback - Check if address is loopback
+ * @a: IPv[46] address
+ *
+ * Return: true if @a is either ::1 or in 127.0.0.1/8
+ */
+static inline bool inany_is_loopback(const union inany_addr *a)
+{
+ const struct in_addr *v4 = inany_v4(a);
+
+ return IN6_IS_ADDR_LOOPBACK(&a->a6) || (v4 && IN4_IS_ADDR_LOOPBACK(v4));
+}
+
+/** inany_is_unspecified - Check if address is unspecified
+ * @a: IPv[46] address
+ *
+ * Return: true if @a is either :: or 0.0.0.0
+ */
+static inline bool inany_is_unspecified(const union inany_addr *a)
+{
+ const struct in_addr *v4 = inany_v4(a);
+
+ return IN6_IS_ADDR_UNSPECIFIED(&a->a6) ||
+ (v4 && IN4_IS_ADDR_UNSPECIFIED(v4));
+}
+
+/** inany_is_multicast - Check if address is multicast or broadcast
+ * @a: IPv[46] address
+ *
+ * Return: true if @a is IPv6 multicast or IPv4 multicast or broadcast
+ */
+static inline bool inany_is_multicast(const union inany_addr *a)
+{
+ const struct in_addr *v4 = inany_v4(a);
+
+ return IN6_IS_ADDR_MULTICAST(&a->a6) ||
+ (v4 && (IN4_IS_ADDR_MULTICAST(v4) ||
+ IN4_IS_ADDR_BROADCAST(v4)));
+}
+
+/** inany_is_unicast - Check if address is specified and unicast
+ * @a: IPv[46] address
+ *
+ * Return: true if @a is specified and a unicast address
+ */
+/* cppcheck-suppress unusedFunction */
+static inline bool inany_is_unicast(const union inany_addr *a)
+{
+ return !inany_is_unspecified(a) && !inany_is_multicast(a);
+}
+
/** inany_from_af - Set IPv[46] address from IPv4 or IPv6 address
* @aa: Pointer to store IPv[46] address
* @af: Address family of @addr
diff --git a/tcp_splice.c b/tcp_splice.c
index cc9745e8..4ecc178b 100644
--- a/tcp_splice.c
+++ b/tcp_splice.c
@@ -440,29 +440,20 @@ bool tcp_splice_conn_from_sock(const struct ctx *c,
struct tcp_splice_conn *conn, int s,
const struct sockaddr *sa)
{
- const struct in_addr *a4;
union inany_addr aany;
in_port_t port;
ASSERT(c->mode == MODE_PASTA);
inany_from_sockaddr(&aany, &port, sa);
- a4 = inany_v4(&aany);
-
- if (a4) {
- if (!IN4_IS_ADDR_LOOPBACK(a4))
- return false;
- conn->flags = 0;
- } else {
- if (!IN6_IS_ADDR_LOOPBACK(&aany.a6))
- return false;
- conn->flags = SPLICE_V6;
- }
+ if (!inany_is_loopback(&aany))
+ return false;
if (setsockopt(s, SOL_TCP, TCP_QUICKACK, &((int){ 1 }), sizeof(int)))
flow_trace(conn, "failed to set TCP_QUICKACK on %i", s);
conn->f.type = FLOW_TCP_SPLICE;
+ conn->flags = inany_v4(&aany) ? 0 : SPLICE_V6;
conn->s[0] = s;
if (tcp_splice_new(c, conn, ref.port, ref.pif))
--
2.43.0