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-rw-r--r--zebra/tc_netlink.c468
1 files changed, 468 insertions, 0 deletions
diff --git a/zebra/tc_netlink.c b/zebra/tc_netlink.c
new file mode 100644
index 0000000..afa03a4
--- /dev/null
+++ b/zebra/tc_netlink.c
@@ -0,0 +1,468 @@
+/*
+ * Zebra Traffic Control (TC) interaction with the kernel using netlink.
+ *
+ * Copyright (C) 2022 Shichu Yang
+ *
+ * This file is part of FRR.
+ *
+ * FRR is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2, or (at your option) any
+ * later version.
+ *
+ * FRR is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with FRR; see the file COPYING. If not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+ * 02111-1307, USA.
+ */
+
+#include <zebra.h>
+
+#ifdef HAVE_NETLINK
+
+#include <netinet/if_ether.h>
+#include <sys/socket.h>
+
+#include "if.h"
+#include "prefix.h"
+#include "vrf.h"
+
+#include <linux/fib_rules.h>
+#include <linux/pkt_cls.h>
+#include <linux/pkt_sched.h>
+#include "zebra/zserv.h"
+#include "zebra/zebra_ns.h"
+#include "zebra/zebra_vrf.h"
+#include "zebra/rt.h"
+#include "zebra/interface.h"
+#include "zebra/debug.h"
+#include "zebra/rtadv.h"
+#include "zebra/kernel_netlink.h"
+#include "zebra/tc_netlink.h"
+#include "zebra/zebra_errors.h"
+#include "zebra/zebra_dplane.h"
+#include "zebra/zebra_trace.h"
+
+/* TODO: move these bitflags to zebra_tc.h */
+#define TC_FILTER_SRC_IP (1 << 0)
+#define TC_FILTER_DST_IP (1 << 1)
+#define TC_FILTER_IP_PROTOCOL (1 << 9)
+
+#define TC_FREQ_DEFAULT (100)
+
+#define TC_MAJOR_BASE (0x1000u)
+#define TC_MINOR_NOCLASS (0xffffu)
+
+#define TC_FILTER_MASK (0x8000u)
+
+#define TIME_UNITS_PER_SEC (1000000)
+#define xmittime(r, s) (TIME_UNITS_PER_SEC * ((double)(s) / (double)(r)))
+
+static uint32_t tc_get_freq(void)
+{
+ int freq = 0;
+ FILE *fp = fopen("/proc/net/psched", "r");
+
+ if (fp) {
+ uint32_t nom, denom;
+
+ if (fscanf(fp, "%*08x%*08x%08x%08x", &nom, &denom) == 2) {
+ if (nom == 1000000)
+ freq = denom;
+ }
+ fclose(fp);
+ }
+
+ return freq == 0 ? TC_FREQ_DEFAULT : freq;
+}
+
+static inline uint32_t tc_make_handle(uint16_t major, uint16_t minor)
+{
+ return (major) << 16 | (minor);
+}
+
+static inline uint32_t tc_get_handle(struct zebra_dplane_ctx *ctx,
+ uint16_t minor)
+{
+ uint16_t major = TC_MAJOR_BASE + (uint16_t)dplane_ctx_get_ifindex(ctx);
+
+ return tc_make_handle(major, minor);
+}
+
+static void tc_calc_rate_table(struct tc_ratespec *ratespec, uint32_t *table,
+ uint32_t mtu)
+{
+ if (mtu == 0)
+ mtu = 2047;
+
+ int cell_log = -1;
+
+ if (cell_log < 0) {
+ cell_log = 0;
+ while ((mtu >> cell_log) > 255)
+ cell_log++;
+ }
+
+ for (int i = 0; i < 256; i++)
+ table[i] = xmittime(ratespec->rate, (i + 1) << cell_log);
+
+ ratespec->cell_align = -1;
+ ratespec->cell_log = cell_log;
+ ratespec->linklayer = TC_LINKLAYER_ETHERNET;
+}
+
+static int tc_flower_get_inet_prefix(const struct prefix *prefix,
+ struct inet_prefix *addr)
+{
+ addr->family = prefix->family;
+
+ if (addr->family == AF_INET) {
+ addr->bytelen = 4;
+ addr->bitlen = prefix->prefixlen;
+ addr->flags = 0;
+ addr->flags |= PREFIXLEN_SPECIFIED;
+ addr->flags |= ADDRTYPE_INET;
+ memcpy(addr->data, prefix->u.val32, sizeof(prefix->u.val32));
+ } else if (addr->family == AF_INET6) {
+ addr->bytelen = 16;
+ addr->bitlen = prefix->prefixlen;
+ addr->flags = 0;
+ addr->flags |= PREFIXLEN_SPECIFIED;
+ addr->flags |= ADDRTYPE_INET;
+ memcpy(addr->data, prefix->u.val, sizeof(prefix->u.val));
+ } else {
+ return -1;
+ }
+
+ return 0;
+}
+
+static int tc_flower_get_inet_mask(const struct prefix *prefix,
+ struct inet_prefix *addr)
+{
+ addr->family = prefix->family;
+
+ if (addr->family == AF_INET) {
+ addr->bytelen = 4;
+ addr->bitlen = prefix->prefixlen;
+ addr->flags = 0;
+ addr->flags |= PREFIXLEN_SPECIFIED;
+ addr->flags |= ADDRTYPE_INET;
+ } else if (addr->family == AF_INET6) {
+ addr->bytelen = 16;
+ addr->bitlen = prefix->prefixlen;
+ addr->flags = 0;
+ addr->flags |= PREFIXLEN_SPECIFIED;
+ addr->flags |= ADDRTYPE_INET;
+ } else {
+ return -1;
+ }
+
+ memset(addr->data, 0xff, addr->bytelen);
+
+ int rest = prefix->prefixlen;
+
+ for (int i = 0; i < addr->bytelen / 4; i++) {
+ if (!rest) {
+ addr->data[i] = 0;
+ } else if (rest / 32 >= 1) {
+ rest -= 32;
+ } else {
+ addr->data[i] <<= 32 - rest;
+ addr->data[i] = htonl(addr->data[i]);
+ rest = 0;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Traffic control queue discipline encoding (only "htb" supported)
+ */
+static ssize_t netlink_qdisc_msg_encode(int cmd, struct zebra_dplane_ctx *ctx,
+ void *data, size_t datalen)
+{
+ struct nlsock *nl;
+
+ const char *kind = "htb";
+
+ struct tc_htb_glob htb_glob = {
+ .rate2quantum = 10, .version = 3, .defcls = TC_MINOR_NOCLASS};
+
+ struct rtattr *nest;
+
+ struct {
+ struct nlmsghdr n;
+ struct tcmsg t;
+ char buf[0];
+ } *req = (void *)data;
+
+ if (datalen < sizeof(*req))
+ return 0;
+
+ nl = kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx));
+
+ memset(req, 0, sizeof(*req));
+
+ req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
+ req->n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST;
+
+ req->n.nlmsg_flags |= NLM_F_REPLACE;
+
+ req->n.nlmsg_type = cmd;
+
+ req->n.nlmsg_pid = nl->snl.nl_pid;
+
+ req->t.tcm_family = AF_UNSPEC;
+ req->t.tcm_ifindex = dplane_ctx_get_ifindex(ctx);
+ req->t.tcm_handle = tc_get_handle(ctx, 0);
+ req->t.tcm_parent = TC_H_ROOT;
+
+ nl_attr_put(&req->n, datalen, TCA_KIND, kind, strlen(kind) + 1);
+
+ nest = nl_attr_nest(&req->n, datalen, TCA_OPTIONS);
+
+ nl_attr_put(&req->n, datalen, TCA_HTB_INIT, &htb_glob,
+ sizeof(htb_glob));
+ nl_attr_nest_end(&req->n, nest);
+
+ return NLMSG_ALIGN(req->n.nlmsg_len);
+}
+
+/*
+ * Traffic control class encoding
+ */
+static ssize_t netlink_tclass_msg_encode(int cmd, struct zebra_dplane_ctx *ctx,
+ void *data, size_t datalen)
+{
+ struct nlsock *nl;
+ struct tc_htb_opt htb_opt = {};
+
+ uint64_t rate, ceil;
+ uint64_t buffer, cbuffer;
+
+ /* TODO: fetch mtu from interface */
+ uint32_t mtu = 0;
+
+ uint32_t rtab[256];
+ uint32_t ctab[256];
+
+ struct rtattr *nest;
+
+ struct {
+ struct nlmsghdr n;
+ struct tcmsg t;
+ char buf[0];
+ } *req = (void *)data;
+
+ if (datalen < sizeof(*req))
+ return 0;
+
+ nl = kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx));
+
+ memset(req, 0, sizeof(*req));
+
+ req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
+ req->n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST;
+
+ req->n.nlmsg_type = cmd;
+
+ req->n.nlmsg_pid = nl->snl.nl_pid;
+
+ req->t.tcm_family = AF_UNSPEC;
+ req->t.tcm_ifindex = dplane_ctx_get_ifindex(ctx);
+ req->t.tcm_handle = tc_get_handle(ctx, 1);
+ req->t.tcm_parent = tc_get_handle(ctx, 0);
+
+ rate = dplane_ctx_tc_get_rate(ctx);
+ ceil = dplane_ctx_tc_get_ceil(ctx);
+
+ ceil = ceil < rate ? rate : ceil;
+
+ htb_opt.rate.rate = (rate >> 32 != 0) ? ~0U : rate;
+ htb_opt.ceil.rate = (ceil >> 32 != 0) ? ~0U : ceil;
+
+ buffer = rate / tc_get_freq(), cbuffer = ceil / tc_get_freq();
+
+ htb_opt.buffer = buffer;
+ htb_opt.cbuffer = cbuffer;
+
+ tc_calc_rate_table(&htb_opt.rate, rtab, mtu);
+ tc_calc_rate_table(&htb_opt.ceil, ctab, mtu);
+
+ htb_opt.ceil.mpu = htb_opt.rate.mpu = 0;
+ htb_opt.ceil.overhead = htb_opt.rate.overhead = 0;
+
+ nest = nl_attr_nest(&req->n, datalen, TCA_OPTIONS);
+
+ if (rate >> 32 != 0) {
+ nl_attr_put(&req->n, datalen, TCA_HTB_CEIL64, &rate,
+ sizeof(rate));
+ }
+
+ if (ceil >> 32 != 0) {
+ nl_attr_put(&req->n, datalen, TCA_HTB_CEIL64, &ceil,
+ sizeof(ceil));
+ }
+
+ nl_attr_put(&req->n, datalen, TCA_HTB_PARMS, &htb_opt, sizeof(htb_opt));
+
+ nl_attr_put(&req->n, datalen, TCA_HTB_RTAB, rtab, sizeof(rtab));
+ nl_attr_put(&req->n, datalen, TCA_HTB_CTAB, ctab, sizeof(ctab));
+ nl_attr_nest_end(&req->n, nest);
+
+ return NLMSG_ALIGN(req->n.nlmsg_len);
+}
+
+/*
+ * Traffic control filter encoding (only "flower" supported)
+ */
+static ssize_t netlink_tfilter_msg_encode(int cmd, struct zebra_dplane_ctx *ctx,
+ void *data, size_t datalen)
+{
+ struct nlsock *nl;
+ struct rtattr *nest;
+
+ const char *kind = "flower";
+
+ uint16_t priority;
+ uint16_t protocol;
+ uint32_t classid;
+ uint32_t filter_bm;
+ uint32_t flags = 0;
+
+ struct inet_prefix addr;
+
+ struct {
+ struct nlmsghdr n;
+ struct tcmsg t;
+ char buf[0];
+ } *req = (void *)data;
+
+ if (datalen < sizeof(*req))
+ return 0;
+
+ nl = kernel_netlink_nlsock_lookup(dplane_ctx_get_ns_sock(ctx));
+
+ memset(req, 0, sizeof(*req));
+
+ req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct tcmsg));
+ req->n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST;
+
+ req->n.nlmsg_flags |= NLM_F_EXCL;
+
+ req->n.nlmsg_type = cmd;
+
+ req->n.nlmsg_pid = nl->snl.nl_pid;
+
+ req->t.tcm_family = AF_UNSPEC;
+ req->t.tcm_ifindex = dplane_ctx_get_ifindex(ctx);
+
+ /* TODO: priority and layer-3 protocol support */
+ priority = 0;
+ protocol = htons(ETH_P_IP);
+ classid = tc_get_handle(ctx, 1);
+ filter_bm = dplane_ctx_tc_get_filter_bm(ctx);
+
+ req->t.tcm_info = tc_make_handle(priority, protocol);
+
+ req->t.tcm_handle = 1;
+ req->t.tcm_parent = tc_get_handle(ctx, 0);
+
+ nl_attr_put(&req->n, datalen, TCA_KIND, kind, strlen(kind) + 1);
+ nest = nl_attr_nest(&req->n, datalen, TCA_OPTIONS);
+
+ nl_attr_put(&req->n, datalen, TCA_FLOWER_CLASSID, &classid,
+ sizeof(classid));
+
+ if (filter_bm & TC_FILTER_SRC_IP) {
+ const struct prefix *src_p = dplane_ctx_tc_get_src_ip(ctx);
+
+ if (tc_flower_get_inet_prefix(src_p, &addr) != 0)
+ return 0;
+
+ nl_attr_put(&req->n, datalen,
+ (addr.family == AF_INET) ? TCA_FLOWER_KEY_IPV4_SRC
+ : TCA_FLOWER_KEY_IPV6_SRC,
+ addr.data, addr.bytelen);
+
+ if (tc_flower_get_inet_mask(src_p, &addr) != 0)
+ return 0;
+
+ nl_attr_put(&req->n, datalen,
+ (addr.family == AF_INET)
+ ? TCA_FLOWER_KEY_IPV4_SRC_MASK
+ : TCA_FLOWER_KEY_IPV6_SRC_MASK,
+ addr.data, addr.bytelen);
+ }
+
+ if (filter_bm & TC_FILTER_DST_IP) {
+ const struct prefix *dst_p = dplane_ctx_tc_get_dst_ip(ctx);
+
+ if (tc_flower_get_inet_prefix(dst_p, &addr) != 0)
+ return 0;
+
+ nl_attr_put(&req->n, datalen,
+ (addr.family == AF_INET) ? TCA_FLOWER_KEY_IPV4_DST
+ : TCA_FLOWER_KEY_IPV6_DST,
+ addr.data, addr.bytelen);
+
+ if (tc_flower_get_inet_mask(dst_p, &addr) != 0)
+ return 0;
+
+ nl_attr_put(&req->n, datalen,
+ (addr.family == AF_INET)
+ ? TCA_FLOWER_KEY_IPV4_DST_MASK
+ : TCA_FLOWER_KEY_IPV6_DST_MASK,
+ addr.data, addr.bytelen);
+ }
+
+ if (filter_bm & TC_FILTER_IP_PROTOCOL) {
+ nl_attr_put8(&req->n, datalen, TCA_FLOWER_KEY_IP_PROTO,
+ dplane_ctx_tc_get_ip_proto(ctx));
+ }
+
+ nl_attr_put32(&req->n, datalen, TCA_FLOWER_FLAGS, flags);
+
+ nl_attr_put16(&req->n, datalen, TCA_FLOWER_KEY_ETH_TYPE, protocol);
+ nl_attr_nest_end(&req->n, nest);
+
+ return NLMSG_ALIGN(req->n.nlmsg_len);
+}
+
+static ssize_t netlink_newqdisc_msg_encoder(struct zebra_dplane_ctx *ctx,
+ void *buf, size_t buflen)
+{
+ return netlink_qdisc_msg_encode(RTM_NEWQDISC, ctx, buf, buflen);
+}
+
+static ssize_t netlink_newtclass_msg_encoder(struct zebra_dplane_ctx *ctx,
+ void *buf, size_t buflen)
+{
+ return netlink_tclass_msg_encode(RTM_NEWTCLASS, ctx, buf, buflen);
+}
+
+static ssize_t netlink_newtfilter_msg_encoder(struct zebra_dplane_ctx *ctx,
+ void *buf, size_t buflen)
+{
+ return netlink_tfilter_msg_encode(RTM_NEWTFILTER, ctx, buf, buflen);
+}
+
+enum netlink_msg_status netlink_put_tc_update_msg(struct nl_batch *bth,
+ struct zebra_dplane_ctx *ctx)
+{
+ /* TODO: error handling and other actions (delete, replace, ...) */
+
+ netlink_batch_add_msg(bth, ctx, netlink_newqdisc_msg_encoder, false);
+ netlink_batch_add_msg(bth, ctx, netlink_newtclass_msg_encoder, false);
+ return netlink_batch_add_msg(bth, ctx, netlink_newtfilter_msg_encoder,
+ false);
+}
+
+#endif /* HAVE_NETLINK */
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