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| | /* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright Red Hat
* Author: David Gibson <david@gibson.dropbear.id.au>
*
* Tracking for logical "flows" of packets.
*/
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <arpa/inet.h>
#include "util.h"
#include "passt.h"
#include "inany.h"
#include "siphash.h"
#include "flow.h"
#include "tcp_conn.h"
#include "flow_table.h"
const char *flow_type_str[] = {
[FLOW_NONE] = "<none>",
[FLOW_TCP] = "TCP connection",
[FLOW_TCP_SPLICE] = "TCP connection (spliced)",
};
/* Global Flow Table */
union flow flowtab[FLOW_MAX];
/** flowside_fmt - Format a flowside as a string
* @fs: flowside to format
* @buf: Buffer into which to store the formatted version
* @size: Size of @buf
*
* Return: pointer to formatted string describing @fs, or NULL on error
*/
const char *flowside_fmt(const struct flowside *fs, char *buf, size_t size)
{
char ebuf[INET6_ADDRSTRLEN], fbuf[INET6_ADDRSTRLEN];
if (!inet_ntop(AF_INET6, &fs->eaddr, ebuf, sizeof(ebuf))
|| !inet_ntop(AF_INET6, &fs->faddr, fbuf, sizeof(fbuf)))
return NULL;
snprintf(buf, size, "[%s]:%hu <-> [%s]:%hu", fbuf, fs->fport,
ebuf, fs->eport);
return (const char *)buf;
}
/**
* flow_table_compact() - Perform compaction on flow table
* @c: Execution context
* @hole: Pointer to recently closed flow
*/
void flow_table_compact(struct ctx *c, union flow *hole)
{
union flow *from;
if (FLOW_IDX(hole) == --c->flow_count) {
debug("flow: table compaction: maximum index was %li (%p)",
FLOW_IDX(hole), hole);
memset(hole, 0, sizeof(*hole));
return;
}
from = flowtab + c->flow_count;
memcpy(hole, from, sizeof(*hole));
switch (from->f.type) {
case FLOW_TCP:
tcp_tap_conn_update(c, &from->tcp, &hole->tcp);
break;
case FLOW_TCP_SPLICE:
tcp_splice_conn_update(c, &hole->tcp_splice);
break;
default:
die("Unexpected %s in tcp_table_compact()",
FLOW_TYPE(&from->f));
}
debug("flow: table compaction (%s): old index %li, new index %li, "
"from: %p, to: %p",
FLOW_TYPE(&from->f), FLOW_IDX(from), FLOW_IDX(hole), from, hole);
memset(from, 0, sizeof(*from));
}
/** flowside_getsockname - Initialize flowside f{addr,port} from a bound socket
* @fs: flowside to initialize
* @s: bound socket
*
* #syscalls getsockname
*/
int flowside_getsockname(struct flowside *fs, int s)
{
struct sockaddr_storage sa;
socklen_t sl = sizeof(sa);
/* FIXME: Workaround clang-tidy not realizing that getsockname() writes
* the socket address. See
* https://github.com/llvm/llvm-project/issues/58992
*/
memset(&sa, 0, sizeof(struct sockaddr_in6));
if (getsockname(s, (struct sockaddr *)&sa, &sl) < 0)
return -errno;
inany_from_sockaddr(&fs->faddr, &fs->fport,
(const struct sockaddr *)&sa);
return 0;
}
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