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https://passt.top/passt
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ca2749e1bd
In practical terms, passt doesn't benefit from the additional protection offered by the AGPL over the GPL, because it's not suitable to be executed over a computer network. Further, restricting the distribution under the version 3 of the GPL wouldn't provide any practical advantage either, as long as the passt codebase is concerned, and might cause unnecessary compatibility dilemmas. Change licensing terms to the GNU General Public License Version 2, or any later version, with written permission from all current and past contributors, namely: myself, David Gibson, Laine Stump, Andrea Bolognani, Paul Holzinger, Richard W.M. Jones, Chris Kuhn, Florian Weimer, Giuseppe Scrivano, Stefan Hajnoczi, and Vasiliy Ulyanov. Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* PASST - Plug A Simple Socket Transport
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* for qemu/UNIX domain socket mode
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*
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* PASTA - Pack A Subtle Tap Abstraction
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* for network namespace/tap device mode
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*
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* packet.c - Packet abstraction: add packets to pool, flush, get packet data
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*
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* Copyright (c) 2020-2021 Red Hat GmbH
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* Author: Stefano Brivio <sbrivio@redhat.com>
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*/
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#include <limits.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <netinet/ip6.h>
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#include "packet.h"
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#include "util.h"
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#include "log.h"
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/**
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* packet_add_do() - Add data as packet descriptor to given pool
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* @p: Existing pool
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* @len: Length of new descriptor
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* @start: Start of data
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* @func: For tracing: name of calling function, NULL means no trace()
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* @line: For tracing: caller line of function call
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*/
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void packet_add_do(struct pool *p, size_t len, const char *start,
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const char *func, int line)
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{
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size_t index = p->count;
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if (index >= p->size) {
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trace("add packet index %lu to pool with size %lu, %s:%i",
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index, p->size, func, line);
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return;
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}
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if (start < p->buf) {
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trace("add packet start %p before buffer start %p, %s:%i",
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start, p->buf, func, line);
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return;
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}
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if (start + len > p->buf + p->buf_size) {
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trace("add packet start %p, length: %lu, buffer end %p, %s:%i",
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start, len, p->buf + p->buf_size, func, line);
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return;
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}
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if (len > UINT16_MAX) {
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trace("add packet length %lu, %s:%i", len, func, line);
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return;
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}
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#if UINTPTR_MAX == UINT64_MAX
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if ((uintptr_t)start - (uintptr_t)p->buf > UINT32_MAX) {
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trace("add packet start %p, buffer start %p, %s:%i",
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start, p->buf, func, line);
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return;
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}
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#endif
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p->pkt[index].offset = start - p->buf;
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p->pkt[index].len = len;
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p->count++;
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}
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/**
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* packet_get_do() - Get data range from packet descriptor from given pool
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* @p: Packet pool
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* @index: Index of packet descriptor in pool
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* @offset: Offset of data range in packet descriptor
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* @len: Length of desired data range
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* @left: Length of available data after range, set on return, can be NULL
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* @func: For tracing: name of calling function, NULL means no trace()
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* @line: For tracing: caller line of function call
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*
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* Return: pointer to start of data range, NULL on invalid range or descriptor
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*/
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void *packet_get_do(const struct pool *p, size_t index, size_t offset,
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size_t len, size_t *left, const char *func, int line)
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{
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if (index >= p->size || index >= p->count) {
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if (func) {
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trace("packet %lu from pool size: %lu, count: %lu, "
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"%s:%i", index, p->size, p->count, func, line);
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}
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return NULL;
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}
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if (len > UINT16_MAX || len + offset > UINT32_MAX) {
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if (func) {
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trace("packet data length %lu, offset %lu, %s:%i",
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len, offset, func, line);
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}
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return NULL;
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}
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if (p->pkt[index].offset + len + offset > p->buf_size) {
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if (func) {
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trace("packet offset plus length %lu from size %lu, "
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"%s:%i", p->pkt[index].offset + len + offset,
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p->buf_size, func, line);
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}
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return NULL;
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}
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if (len + offset > p->pkt[index].len) {
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if (func) {
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trace("data length %lu, offset %lu from length %u, "
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"%s:%i", len, offset, p->pkt[index].len,
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func, line);
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}
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return NULL;
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}
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if (left)
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*left = p->pkt[index].len - offset - len;
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return p->buf + p->pkt[index].offset + offset;
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}
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/**
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* pool_flush() - Flush a packet pool
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* @p: Pointer to packet pool
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*/
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void pool_flush(struct pool *p)
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{
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p->count = 0;
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}
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