mirror of https://passt.top/passt
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright (c) 2021 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#ifndef TAP_H
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#define TAP_H
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#define ETH_HDR_INIT(proto) { .h_proto = htons_constant(proto) }
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/**
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* struct tap_hdr - tap backend specific headers
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* @vnet_len: Frame length (for qemu socket transport)
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*/
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struct tap_hdr {
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uint32_t vnet_len;
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} __attribute__((packed));
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/**
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* tap_hdr_iov() - struct iovec for a tap header
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* @c: Execution context
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* @taph: Pointer to tap specific header buffer
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*
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* Returns: A struct iovec covering the correct portion of @taph to use as the
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* tap specific header in the current configuration.
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*/
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static inline struct iovec tap_hdr_iov(const struct ctx *c,
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struct tap_hdr *thdr)
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{
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return (struct iovec){
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.iov_base = thdr,
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.iov_len = c->mode == MODE_PASST ? sizeof(*thdr) : 0,
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};
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}
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/**
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* tap_hdr_update() - Update the tap specific header for a frame
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* @taph: Tap specific header buffer to update
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* @l2len: Frame length (including L2 headers)
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*/
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static inline void tap_hdr_update(struct tap_hdr *thdr, size_t l2len)
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{
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thdr->vnet_len = htonl(l2len);
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}
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struct in_addr tap_ip4_daddr(const struct ctx *c);
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void tap_udp4_send(const struct ctx *c, struct in_addr src, in_port_t sport,
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struct in_addr dst, in_port_t dport,
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const void *in, size_t dlen);
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void tap_icmp4_send(const struct ctx *c, struct in_addr src, struct in_addr dst,
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const void *in, size_t l4len);
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const struct in6_addr *tap_ip6_daddr(const struct ctx *c,
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const struct in6_addr *src);
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void tap_udp6_send(const struct ctx *c,
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const struct in6_addr *src, in_port_t sport,
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const struct in6_addr *dst, in_port_t dport,
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uint32_t flow, const void *in, size_t dlen);
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void tap_icmp6_send(const struct ctx *c,
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const struct in6_addr *src, const struct in6_addr *dst,
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const void *in, size_t l4len);
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void tap_send_single(const struct ctx *c, const void *data, size_t l2len);
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size_t tap_send_frames(const struct ctx *c, const struct iovec *iov,
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size_t bufs_per_frame, size_t nframes);
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void eth_update_mac(struct ethhdr *eh,
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const unsigned char *eth_d, const unsigned char *eth_s);
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void tap_listen_handler(struct ctx *c, uint32_t events);
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void tap_handler_pasta(struct ctx *c, uint32_t events,
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const struct timespec *now);
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void tap_handler_passt(struct ctx *c, uint32_t events,
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const struct timespec *now);
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void tap_sock_init(struct ctx *c);
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#endif /* TAP_H */
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