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| | /* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*
* Passt/pasta interface types and IDs
*/
#include <errno.h>
#include <stdint.h>
#include <assert.h>
#include <netinet/in.h>
#include "util.h"
#include "pif.h"
#include "siphash.h"
#include "ip.h"
#include "inany.h"
#include "epoll_ctl.h"
const char pif_type_str[][PIF_NAME_SIZE] = {
[PIF_NONE] = "<none>",
[PIF_HOST] = "HOST",
[PIF_TAP] = "TAP",
[PIF_SPLICE] = "SPLICE",
};
static_assert(ARRAY_SIZE(pif_type_str) == PIF_NUM_TYPES,
"pif_type_str[] doesn't match enum pif_type");
/** pif_sockaddr() - Construct a socket address suitable for an interface
* @c: Execution context
* @sa: Pointer to sockaddr to fill in
* @pif: Interface to create the socket address
* @addr: IPv[46] address
* @port: Port (host byte order)
*/
void pif_sockaddr(const struct ctx *c, union sockaddr_inany *sa,
uint8_t pif, const union inany_addr *addr, in_port_t port)
{
const struct in_addr *v4 = inany_v4(addr);
assert(pif_is_socket(pif));
if (v4) {
sa->sa_family = AF_INET;
sa->sa4.sin_addr = *v4;
sa->sa4.sin_port = htons(port);
memset(&sa->sa4.sin_zero, 0, sizeof(sa->sa4.sin_zero));
} else {
sa->sa_family = AF_INET6;
sa->sa6.sin6_addr = addr->a6;
sa->sa6.sin6_port = htons(port);
if (IN6_IS_ADDR_LINKLOCAL(&addr->a6)) {
if (pif == PIF_HOST)
sa->sa6.sin6_scope_id = c->ifi6;
else if (pif == PIF_SPLICE)
sa->sa6.sin6_scope_id = c->pasta_ifi;
} else {
sa->sa6.sin6_scope_id = 0;
}
sa->sa6.sin6_flowinfo = 0;
}
}
/** pif_listen() - Open a listening socket on a specified pif
* @c: Execution context
* @proto: Socket protocol (IPPROTO_TCP or IPPROTO_UDP)
* @pif: Interface for this socket
* @addr: Address to bind to, or NULL for dual-stack any
* @ifname: Interface for binding, NULL for any
* @port: Port number to bind to (host byte order)
* @rule: Forwarding rule index this socket belongs to
*
* NOTE: For namespace pifs, this must be called having already entered the
* relevant namespace.
*
* Return: newly created socket, negative error code on failure
*/
int pif_listen(const struct ctx *c, uint8_t proto, uint8_t pif,
const union inany_addr *addr, const char *ifname,
in_port_t port, unsigned rule)
{
union epoll_ref ref;
int ret;
assert(pif_is_socket(pif));
if (!c->ifi4) {
if (!addr)
/* Restrict to v6 only */
addr = &inany_any6;
else if (inany_v4(addr))
return -EAFNOSUPPORT;
}
if (!c->ifi6) {
if (!addr)
/* Restrict to v4 only */
addr = &inany_any4;
else if (!inany_v4(addr))
return -EAFNOSUPPORT;
}
if (proto == IPPROTO_TCP)
ref.type = EPOLL_TYPE_TCP_LISTEN;
else if (proto == IPPROTO_UDP)
ref.type = EPOLL_TYPE_UDP_LISTEN;
else
return -EPROTONOSUPPORT;
if (!addr) {
ref.fd = sock_l4_dualstack_any(c, ref.type, port, ifname);
} else {
union sockaddr_inany sa;
pif_sockaddr(c, &sa, pif, addr, port);
ref.fd = sock_l4(c, ref.type, &sa, ifname);
}
if (ref.fd < 0)
return ref.fd;
ref.listen.port = port;
ref.listen.pif = pif;
ref.listen.rule = rule;
if (proto == IPPROTO_TCP && listen(ref.fd, 128) < 0) {
ret = -errno;
goto fail;
}
ret = epoll_add(c->epollfd, EPOLLIN, ref);
if (ret < 0)
goto fail;
return ref.fd;
fail:
close(ref.fd);
return ret;
}
|