diff options
Diffstat (limited to 'src/network/tc/netem.c')
| -rw-r--r-- | src/network/tc/netem.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/src/network/tc/netem.c b/src/network/tc/netem.c new file mode 100644 index 0000000..454e556 --- /dev/null +++ b/src/network/tc/netem.c @@ -0,0 +1,236 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later + * Copyright © 2019 VMware, Inc. */ + +#include <linux/pkt_sched.h> + +#include "alloc-util.h" +#include "conf-parser.h" +#include "netem.h" +#include "netlink-util.h" +#include "networkd-manager.h" +#include "parse-util.h" +#include "qdisc.h" +#include "strv.h" +#include "tc-util.h" + +static int network_emulator_fill_message(Link *link, QDisc *qdisc, sd_netlink_message *req) { + struct tc_netem_qopt opt = { + .limit = 1000, + }; + NetworkEmulator *ne; + int r; + + assert(link); + assert(qdisc); + assert(req); + + ne = NETEM(qdisc); + + if (ne->limit > 0) + opt.limit = ne->limit; + + if (ne->loss > 0) + opt.loss = ne->loss; + + if (ne->duplicate > 0) + opt.duplicate = ne->duplicate; + + if (ne->delay != USEC_INFINITY) { + r = tc_time_to_tick(ne->delay, &opt.latency); + if (r < 0) + return log_link_error_errno(link, r, "Failed to calculate latency in TCA_OPTION: %m"); + } + + if (ne->jitter != USEC_INFINITY) { + r = tc_time_to_tick(ne->jitter, &opt.jitter); + if (r < 0) + return log_link_error_errno(link, r, "Failed to calculate jitter in TCA_OPTION: %m"); + } + + r = sd_netlink_message_append_data(req, TCA_OPTIONS, &opt, sizeof(struct tc_netem_qopt)); + if (r < 0) + return log_link_error_errno(link, r, "Could not append TCA_OPTION attribute: %m"); + + return 0; +} + +int config_parse_network_emulator_delay( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL; + Network *network = data; + NetworkEmulator *ne; + usec_t u; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + r = qdisc_new_static(QDISC_KIND_NETEM, network, filename, section_line, &qdisc); + if (r == -ENOMEM) + return log_oom(); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "More than one kind of queueing discipline, ignoring assignment: %m"); + return 0; + } + + ne = NETEM(qdisc); + + if (isempty(rvalue)) { + if (STR_IN_SET(lvalue, "DelaySec", "NetworkEmulatorDelaySec")) + ne->delay = USEC_INFINITY; + else if (STR_IN_SET(lvalue, "DelayJitterSec", "NetworkEmulatorDelayJitterSec")) + ne->jitter = USEC_INFINITY; + + qdisc = NULL; + return 0; + } + + r = parse_sec(rvalue, &u); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse '%s=', ignoring assignment: %s", + lvalue, rvalue); + return 0; + } + + if (STR_IN_SET(lvalue, "DelaySec", "NetworkEmulatorDelaySec")) + ne->delay = u; + else if (STR_IN_SET(lvalue, "DelayJitterSec", "NetworkEmulatorDelayJitterSec")) + ne->jitter = u; + + qdisc = NULL; + + return 0; +} + +int config_parse_network_emulator_rate( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL; + Network *network = data; + NetworkEmulator *ne; + uint32_t rate; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + r = qdisc_new_static(QDISC_KIND_NETEM, network, filename, section_line, &qdisc); + if (r == -ENOMEM) + return log_oom(); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "More than one kind of queueing discipline, ignoring assignment: %m"); + return 0; + } + + ne = NETEM(qdisc); + + if (isempty(rvalue)) { + if (STR_IN_SET(lvalue, "LossRate", "NetworkEmulatorLossRate")) + ne->loss = 0; + else if (STR_IN_SET(lvalue, "DuplicateRate", "NetworkEmulatorDuplicateRate")) + ne->duplicate = 0; + + qdisc = NULL; + return 0; + } + + r = parse_tc_percent(rvalue, &rate); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse '%s=', ignoring assignment: %s", + lvalue, rvalue); + return 0; + } + + if (STR_IN_SET(lvalue, "LossRate", "NetworkEmulatorLossRate")) + ne->loss = rate; + else if (STR_IN_SET(lvalue, "DuplicateRate", "NetworkEmulatorDuplicateRate")) + ne->duplicate = rate; + + qdisc = NULL; + return 0; +} + +int config_parse_network_emulator_packet_limit( + const char *unit, + const char *filename, + unsigned line, + const char *section, + unsigned section_line, + const char *lvalue, + int ltype, + const char *rvalue, + void *data, + void *userdata) { + + _cleanup_(qdisc_free_or_set_invalidp) QDisc *qdisc = NULL; + Network *network = data; + NetworkEmulator *ne; + int r; + + assert(filename); + assert(lvalue); + assert(rvalue); + assert(data); + + r = qdisc_new_static(QDISC_KIND_NETEM, network, filename, section_line, &qdisc); + if (r == -ENOMEM) + return log_oom(); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "More than one kind of queueing discipline, ignoring assignment: %m"); + return 0; + } + + ne = NETEM(qdisc); + + if (isempty(rvalue)) { + ne->limit = 0; + qdisc = NULL; + + return 0; + } + + r = safe_atou(rvalue, &ne->limit); + if (r < 0) { + log_syntax(unit, LOG_WARNING, filename, line, r, + "Failed to parse '%s=', ignoring assignment: %s", + lvalue, rvalue); + return 0; + } + + qdisc = NULL; + return 0; +} + +const QDiscVTable netem_vtable = { + .object_size = sizeof(NetworkEmulator), + .tca_kind = "netem", + .fill_message = network_emulator_fill_message, +}; |