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inany: Helper to test for various address types

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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.

Use the loopback helper to simplify tcp_splice_conn_from_sock() slightly.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2024-02-28 22:25:01 +11:00 committed by Stefano Brivio
parent 9a3fb5eb68
commit d31277e292
2 changed files with 53 additions and 12 deletions
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50
inany.h
View file

@ -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

15
tcp_splice.c
View file

@ -449,29 +449,20 @@ 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))