fb7c00169d
In general, the passt code is a bit haphazard about what's a true global variable and what's in the quasi-global 'context structure'. The flow_count field is one such example: it's in the context structure, although it's really part of the same data structure as flowtab[], which is a genuine global. Move flow_count to be a regular global to match. For now it needs to be public, rather than static, but we expect to be able to change that in future. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
122 lines
2.8 KiB
C
122 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later
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* Copyright Red Hat
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* Author: David Gibson <david@gibson.dropbear.id.au>
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*
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* Tracking for logical "flows" of packets.
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*/
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#include <stdint.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include "util.h"
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#include "passt.h"
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#include "siphash.h"
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#include "inany.h"
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#include "flow.h"
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#include "flow_table.h"
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const char *flow_type_str[] = {
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[FLOW_TYPE_NONE] = "<none>",
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[FLOW_TCP] = "TCP connection",
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[FLOW_TCP_SPLICE] = "TCP connection (spliced)",
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};
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static_assert(ARRAY_SIZE(flow_type_str) == FLOW_NUM_TYPES,
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"flow_type_str[] doesn't match enum flow_type");
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/* Global Flow Table */
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unsigned flow_count;
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union flow flowtab[FLOW_MAX];
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/* Last time the flow timers ran */
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static struct timespec flow_timer_run;
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/** flow_log_ - Log flow-related message
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* @f: flow the message is related to
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* @pri: Log priority
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* @fmt: Format string
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* @...: printf-arguments
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*/
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void flow_log_(const struct flow_common *f, int pri, const char *fmt, ...)
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{
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char msg[BUFSIZ];
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va_list args;
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va_start(args, fmt);
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(void)vsnprintf(msg, sizeof(msg), fmt, args);
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va_end(args);
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logmsg(pri, "Flow %u (%s): %s", flow_idx(f), FLOW_TYPE(f), msg);
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}
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/**
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* flow_table_compact() - Perform compaction on flow table
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* @c: Execution context
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* @hole: Pointer to recently closed flow
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*/
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void flow_table_compact(const struct ctx *c, union flow *hole)
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{
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union flow *from;
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if (FLOW_IDX(hole) == --flow_count) {
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debug("flow: table compaction: maximum index was %u (%p)",
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FLOW_IDX(hole), (void *)hole);
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memset(hole, 0, sizeof(*hole));
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return;
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}
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from = flowtab + flow_count;
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memcpy(hole, from, sizeof(*hole));
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switch (from->f.type) {
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case FLOW_TCP:
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tcp_tap_conn_update(c, &from->tcp, &hole->tcp);
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break;
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case FLOW_TCP_SPLICE:
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tcp_splice_conn_update(c, &hole->tcp_splice);
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break;
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default:
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die("Unexpected %s in tcp_table_compact()",
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FLOW_TYPE(&from->f));
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}
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debug("flow: table compaction (%s): old index %u, new index %u, "
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"from: %p, to: %p",
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FLOW_TYPE(&from->f), FLOW_IDX(from), FLOW_IDX(hole),
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(void *)from, (void *)hole);
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memset(from, 0, sizeof(*from));
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}
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/**
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* flow_defer_handler() - Handler for per-flow deferred and timed tasks
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* @c: Execution context
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* @now: Current timestamp
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*/
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void flow_defer_handler(const struct ctx *c, const struct timespec *now)
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{
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bool timer = false;
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union flow *flow;
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if (timespec_diff_ms(now, &flow_timer_run) >= FLOW_TIMER_INTERVAL) {
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timer = true;
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flow_timer_run = *now;
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}
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for (flow = flowtab + flow_count - 1; flow >= flowtab; flow--) {
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switch (flow->f.type) {
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case FLOW_TCP:
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tcp_flow_defer(c, flow);
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break;
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case FLOW_TCP_SPLICE:
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tcp_splice_flow_defer(c, flow);
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if (timer)
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tcp_splice_timer(c, flow);
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break;
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default:
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/* Assume other flow types don't need any handling */
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;
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}
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}
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}
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