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| | /* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright (c) 2021 Red Hat GmbH
* Author: Stefano Brivio <sbrivio@redhat.com>
*/
#ifndef TAP_H
#define TAP_H
#include <stddef.h>
#include <stdint.h>
#include "passt.h"
#include "tap_hdr.h"
struct udphdr;
/**
* tap_hdr_iov() - struct iovec for a tap header
* @c: Execution context
* @taph: Pointer to tap specific header buffer
*
* Return: a struct iovec covering the correct portion of @taph to use as the
* tap specific header in the current configuration.
*/
static inline struct iovec tap_hdr_iov(const struct ctx *c,
struct tap_hdr *thdr)
{
struct iovec ret = {
.iov_base = thdr,
};
if ((c->vhost.fd != -1)) {
ret.iov_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
} else {
ret.iov_len = c->mode == MODE_PASST ? sizeof(thdr->vnet_len) : 0;
};
return ret;
}
/**
* tap_hdr_update() - Update the tap specific header for a frame
* @taph: Tap specific header buffer to update
* @l2len: Frame length (including L2 headers)
*/
static inline void tap_hdr_update(struct tap_hdr *thdr, size_t l2len)
{
thdr->vnet_len = htonl(l2len);
}
unsigned long tap_l2_max_len(const struct ctx *c);
void *tap_push_l2h(const struct ctx *c, void *buf,
const void *src_mac, uint16_t proto);
void *tap_push_ip4h(struct iphdr *ip4h, struct in_addr src,
struct in_addr dst, size_t l4len, uint8_t proto);
void *tap_push_uh4(struct udphdr *uh, struct in_addr src, in_port_t sport,
struct in_addr dst, in_port_t dport,
const void *in, size_t dlen);
void *tap_push_uh6(struct udphdr *uh,
const struct in6_addr *src, in_port_t sport,
const struct in6_addr *dst, in_port_t dport,
void *in, size_t dlen);
void *tap_push_ip4h(struct iphdr *ip4h, struct in_addr src,
struct in_addr dst, size_t l4len, uint8_t proto);
void *tap_push_ip6h(struct ipv6hdr *ip6h,
const struct in6_addr *src,
const struct in6_addr *dst,
size_t l4len, uint8_t proto, uint32_t flow);
void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport,
struct in_addr dst, in_port_t dport,
const void *in, size_t dlen);
void tap_icmp4_send(const struct ctx *c, struct in_addr src, struct in_addr dst,
const void *in, const void *src_mac, size_t l4len);
void *tap_push_ip6h(struct ipv6hdr *ip6h,
const struct in6_addr *src, const struct in6_addr *dst,
size_t l4len, uint8_t proto, uint32_t flow);
void tap_udp6_send(const struct ctx *c,
const struct in6_addr *src, in_port_t sport,
const struct in6_addr *dst, in_port_t dport,
uint32_t flow, void *in, size_t dlen);
void tap_icmp6_send(const struct ctx *c,
const struct in6_addr *src, const struct in6_addr *dst,
const void *in, const void *src_mac, size_t l4len);
void tap_send_single(const struct ctx *c, const void *data, size_t l2len);
size_t tap_send_frames(const struct ctx *c, const struct iovec *iov,
size_t bufs_per_frame, size_t nframes);
void eth_update_mac(struct ethhdr *eh,
const unsigned char *eth_d, const unsigned char *eth_s);
bool tap_is_ready(const struct ctx *c);
void tap_listen_handler(struct ctx *c, uint32_t events);
void tap_handler_pasta(struct ctx *c, uint32_t events,
const struct timespec *now);
void tap_handler_passt(struct ctx *c, uint32_t events,
const struct timespec *now);
int tap_sock_unix_open(char *sock_path);
void tap_sock_reset(struct ctx *c);
void tap_backend_init(struct ctx *c);
void tap_flush_pools(void);
void tap_handler(struct ctx *c, const struct timespec *now);
void tap_add_packet(struct ctx *c, struct iov_tail *data,
const struct timespec *now);
#endif /* TAP_H */
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