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inany: Better helpers for using inany and specific family addrs together

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This adds some extra inany helpers for comparing an inany address to
addresses of a specific family (including special addresses), and building
an inany from an IPv4 address (either statically or at runtime).

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 2024-05-21 15:57:04 +10:00 committed by Stefano Brivio
parent 7a832a8a0e
commit a63199832a
3 changed files with 106 additions and 37 deletions
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17
inany.c
View file

@ -17,21 +17,8 @@
#include "siphash.h"
#include "inany.h"
const union inany_addr inany_loopback4 = {
.v4mapped = {
.zero = { 0 },
.one = { 0xff, 0xff, },
.a4 = IN4ADDR_LOOPBACK_INIT,
},
};
const union inany_addr inany_any4 = {
.v4mapped = {
.zero = { 0 },
.one = { 0xff, 0xff, },
.a4 = IN4ADDR_ANY_INIT,
},
};
const union inany_addr inany_loopback4 = INANY_INIT4(IN4ADDR_LOOPBACK_INIT);
const union inany_addr inany_any4 = INANY_INIT4(IN4ADDR_ANY_INIT);
/** inany_ntop - Convert an IPv[46] address to text format
* @src: IPv[46] address

97
inany.h
View file

@ -43,6 +43,17 @@ extern const union inany_addr inany_any4;
#define in4addr_loopback (inany_loopback4.v4mapped.a4)
#define in4addr_any (inany_any4.v4mapped.a4)
#define INANY_INIT4(a4init) { \
.v4mapped = { \
.zero = { 0 }, \
.one = { 0xff, 0xff }, \
.a4 = a4init, \
}, \
}
#define inany_from_v4(a4) \
((union inany_addr)INANY_INIT4((a4)))
/** union sockaddr_inany - Either a sockaddr_in or a sockaddr_in6
* @sa_family: Address family, AF_INET or AF_INET6
* @sa: Plain struct sockaddr (useful to avoid casts)
@ -79,16 +90,84 @@ static inline bool inany_equals(const union inany_addr *a,
return IN6_ARE_ADDR_EQUAL(&a->a6, &b->a6);
}
/** inany_equals4 - Compare an IPv[46] address to an IPv4 address
* @a: IPv[46] addresses
* @b: IPv4 address
*
* Return: true if @a and @b are the same address
*/
static inline bool inany_equals4(const union inany_addr *a,
const struct in_addr *b)
{
const struct in_addr *a4 = inany_v4(a);
return a4 && IN4_ARE_ADDR_EQUAL(a4, b);
}
/** inany_equals6 - Compare an IPv[46] address to an IPv6 address
* @a: IPv[46] addresses
* @b: IPv6 address
*
* Return: true if @a and @b are the same address
*/
static inline bool inany_equals6(const union inany_addr *a,
const struct in6_addr *b)
{
return IN6_ARE_ADDR_EQUAL(&a->a6, b);
}
/** inany_is_loopback4() - Check if address is IPv4 loopback
* @a: IPv[46] address
*
* Return: true if @a is in 127.0.0.1/8
*/
static inline bool inany_is_loopback4(const union inany_addr *a)
{
const struct in_addr *v4 = inany_v4(a);
return v4 && IN4_IS_ADDR_LOOPBACK(v4);
}
/** inany_is_loopback6() - Check if address is IPv6 loopback
* @a: IPv[46] address
*
* Return: true if @a is in ::1
*/
static inline bool inany_is_loopback6(const union inany_addr *a)
{
return IN6_IS_ADDR_LOOPBACK(&a->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)
{
return inany_is_loopback4(a) || inany_is_loopback6(a);
}
/** inany_is_unspecified4() - Check if address is unspecified IPv4
* @a: IPv[46] address
*
* Return: true if @a is 0.0.0.0
*/
static inline bool inany_is_unspecified4(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));
return v4 && IN4_IS_ADDR_UNSPECIFIED(v4);
}
/** inany_is_unspecified6() - Check if address is unspecified IPv6
* @a: IPv[46] address
*
* Return: true if @a is ::
*/
static inline bool inany_is_unspecified6(const union inany_addr *a)
{
return IN6_IS_ADDR_UNSPECIFIED(&a->a6);
}
/** inany_is_unspecified() - Check if address is unspecified
@ -98,10 +177,20 @@ static inline bool inany_is_loopback(const union inany_addr *a)
*/
static inline bool inany_is_unspecified(const union inany_addr *a)
{
const struct in_addr *v4 = inany_v4(a);
return inany_is_unspecified4(a) || inany_is_unspecified6(a);
}
return IN6_IS_ADDR_UNSPECIFIED(&a->a6) ||
(v4 && IN4_IS_ADDR_UNSPECIFIED(v4));
/* FIXME: consider handling of IPv4 link-local addresses */
/** inany_is_linklocal6() - Check if address is link-local IPv6
* @a: IPv[46] address
*
* Return: true if @a is in fe80::/10 (IPv6 link local unicast)
*/
/* cppcheck-suppress unusedFunction */
static inline bool inany_is_linklocal6(const union inany_addr *a)
{
return IN6_IS_ADDR_LINKLOCAL(&a->a6);
}
/** inany_is_multicast() - Check if address is multicast or broadcast

29
tcp.c
View file

@ -2687,24 +2687,17 @@ static void tcp_connect_finish(struct ctx *c, struct tcp_tap_conn *conn)
*/
static void tcp_snat_inbound(const struct ctx *c, union inany_addr *addr)
{
struct in_addr *addr4 = inany_v4(addr);
if (addr4) {
if (IN4_IS_ADDR_LOOPBACK(addr4) ||
IN4_IS_ADDR_UNSPECIFIED(addr4) ||
IN4_ARE_ADDR_EQUAL(addr4, &c->ip4.addr_seen))
*addr4 = c->ip4.gw;
} else {
struct in6_addr *addr6 = &addr->a6;
if (IN6_IS_ADDR_LOOPBACK(addr6) ||
IN6_ARE_ADDR_EQUAL(addr6, &c->ip6.addr_seen) ||
IN6_ARE_ADDR_EQUAL(addr6, &c->ip6.addr)) {
if (IN6_IS_ADDR_LINKLOCAL(&c->ip6.gw))
*addr6 = c->ip6.gw;
else
*addr6 = c->ip6.addr_ll;
}
if (inany_is_loopback4(addr) ||
inany_is_unspecified4(addr) ||
inany_equals4(addr, &c->ip4.addr_seen)) {
*addr = inany_from_v4(c->ip4.gw);
} else if (inany_is_loopback6(addr) ||
inany_equals6(addr, &c->ip6.addr_seen) ||
inany_equals6(addr, &c->ip6.addr)) {
if (IN6_IS_ADDR_LINKLOCAL(&c->ip6.gw))
addr->a6 = c->ip6.gw;
else
addr->a6 = c->ip6.addr_ll;
}
}