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https://git.kernel.org/pub/scm/network/iproute2/iproute2.git
synced 2024-11-15 22:15:13 +08:00
tc: add mpls actions
Create a new action type for TC that allows the pushing, popping, and modifying of MPLS headers. Signed-off-by: John Hurley <john.hurley@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
John Hurley
David Ahern
parent
11d7087a4e
commit
fb57b0920f
@ -39,6 +39,7 @@ TCMODULES += q_drr.o
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TCMODULES += q_qfq.o
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TCMODULES += m_gact.o
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TCMODULES += m_mirred.o
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TCMODULES += m_mpls.o
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TCMODULES += m_nat.o
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TCMODULES += m_pedit.o
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TCMODULES += m_ife.o
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276
tc/m_mpls.c
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276
tc/m_mpls.c
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@ -0,0 +1,276 @@
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// SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
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/* Copyright (C) 2019 Netronome Systems, Inc. */
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#include <linux/if_ether.h>
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#include <linux/tc_act/tc_mpls.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "utils.h"
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#include "rt_names.h"
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#include "tc_util.h"
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static const char * const action_names[] = {
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[TCA_MPLS_ACT_POP] = "pop",
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[TCA_MPLS_ACT_PUSH] = "push",
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[TCA_MPLS_ACT_MODIFY] = "modify",
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[TCA_MPLS_ACT_DEC_TTL] = "dec_ttl",
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};
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static void explain(void)
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{
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fprintf(stderr,
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"Usage: mpls pop [ protocol MPLS_PROTO ]\n"
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" mpls push [ protocol MPLS_PROTO ] [ label MPLS_LABEL ] [ tc MPLS_TC ]\n"
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" [ ttl MPLS_TTL ] [ bos MPLS_BOS ] [CONTROL]\n"
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" mpls modify [ label MPLS_LABEL ] [ tc MPLS_TC ] [ ttl MPLS_TTL ] [CONTROL]\n"
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" for pop MPLS_PROTO is next header of packet - e.g. ip or mpls_uc\n"
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" for push MPLS_PROTO is one of mpls_uc or mpls_mc\n"
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" with default: mpls_uc\n"
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" CONTROL := reclassify | pipe | drop | continue | pass |\n"
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" goto chain <CHAIN_INDEX>\n");
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}
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static void usage(void)
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{
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explain();
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exit(-1);
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}
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static bool can_modify_mpls_fields(unsigned int action)
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{
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return action == TCA_MPLS_ACT_PUSH || action == TCA_MPLS_ACT_MODIFY;
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}
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static bool can_modify_ethtype(unsigned int action)
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{
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return action == TCA_MPLS_ACT_PUSH || action == TCA_MPLS_ACT_POP;
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}
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static bool is_valid_label(__u32 label)
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{
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return label <= 0xfffff;
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}
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static bool check_double_action(unsigned int action, const char *arg)
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{
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if (!action)
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return false;
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fprintf(stderr,
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"Error: got \"%s\" but action already set to \"%s\"\n",
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arg, action_names[action]);
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explain();
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return true;
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}
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static int parse_mpls(struct action_util *a, int *argc_p, char ***argv_p,
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int tca_id, struct nlmsghdr *n)
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{
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struct tc_mpls parm = {};
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__u32 label = 0xffffffff;
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unsigned int action = 0;
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char **argv = *argv_p;
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struct rtattr *tail;
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int argc = *argc_p;
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__u16 proto = 0;
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__u8 bos = 0xff;
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__u8 tc = 0xff;
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__u8 ttl = 0;
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if (matches(*argv, "mpls") != 0)
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return -1;
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NEXT_ARG();
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while (argc > 0) {
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if (matches(*argv, "pop") == 0) {
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if (check_double_action(action, *argv))
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return -1;
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action = TCA_MPLS_ACT_POP;
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} else if (matches(*argv, "push") == 0) {
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if (check_double_action(action, *argv))
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return -1;
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action = TCA_MPLS_ACT_PUSH;
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} else if (matches(*argv, "modify") == 0) {
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if (check_double_action(action, *argv))
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return -1;
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action = TCA_MPLS_ACT_MODIFY;
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} else if (matches(*argv, "dec_ttl") == 0) {
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if (check_double_action(action, *argv))
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return -1;
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action = TCA_MPLS_ACT_DEC_TTL;
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} else if (matches(*argv, "label") == 0) {
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if (!can_modify_mpls_fields(action))
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invarg("only valid for push/modify", *argv);
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NEXT_ARG();
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if (get_u32(&label, *argv, 0) || !is_valid_label(label))
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invarg("label must be <=0xFFFFF", *argv);
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} else if (matches(*argv, "tc") == 0) {
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if (!can_modify_mpls_fields(action))
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invarg("only valid for push/modify", *argv);
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NEXT_ARG();
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if (get_u8(&tc, *argv, 0) || (tc & ~0x7))
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invarg("tc field is 3 bits max", *argv);
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} else if (matches(*argv, "ttl") == 0) {
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if (!can_modify_mpls_fields(action))
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invarg("only valid for push/modify", *argv);
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NEXT_ARG();
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if (get_u8(&ttl, *argv, 0) || !ttl)
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invarg("ttl must be >0 and <=255", *argv);
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} else if (matches(*argv, "bos") == 0) {
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if (!can_modify_mpls_fields(action))
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invarg("only valid for push/modify", *argv);
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NEXT_ARG();
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if (get_u8(&bos, *argv, 0) || (bos & ~0x1))
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invarg("bos must be 0 or 1", *argv);
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} else if (matches(*argv, "protocol") == 0) {
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if (!can_modify_ethtype(action))
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invarg("only valid for push/pop", *argv);
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NEXT_ARG();
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if (ll_proto_a2n(&proto, *argv))
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invarg("protocol is invalid", *argv);
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} else if (matches(*argv, "help") == 0) {
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usage();
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} else {
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break;
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}
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NEXT_ARG_FWD();
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}
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if (!action)
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incomplete_command();
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parse_action_control_dflt(&argc, &argv, &parm.action,
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false, TC_ACT_PIPE);
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if (argc) {
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if (matches(*argv, "index") == 0) {
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NEXT_ARG();
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if (get_u32(&parm.index, *argv, 10))
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invarg("illegal index", *argv);
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NEXT_ARG_FWD();
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}
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}
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if (action == TCA_MPLS_ACT_PUSH && !label)
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missarg("label");
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if (action == TCA_MPLS_ACT_PUSH && proto &&
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proto != htons(ETH_P_MPLS_UC) && proto != htons(ETH_P_MPLS_MC)) {
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fprintf(stderr,
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"invalid push protocol \"0x%04x\" - use mpls_(uc|mc)\n",
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ntohs(proto));
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return -1;
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}
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if (action == TCA_MPLS_ACT_POP && !proto)
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missarg("protocol");
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parm.m_action = action;
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tail = addattr_nest(n, MAX_MSG, tca_id | NLA_F_NESTED);
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addattr_l(n, MAX_MSG, TCA_MPLS_PARMS, &parm, sizeof(parm));
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if (label != 0xffffffff)
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addattr_l(n, MAX_MSG, TCA_MPLS_LABEL, &label, sizeof(label));
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if (proto)
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addattr_l(n, MAX_MSG, TCA_MPLS_PROTO, &proto, sizeof(proto));
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if (tc != 0xff)
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addattr8(n, MAX_MSG, TCA_MPLS_TC, tc);
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if (ttl)
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addattr8(n, MAX_MSG, TCA_MPLS_TTL, ttl);
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if (bos != 0xff)
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addattr8(n, MAX_MSG, TCA_MPLS_BOS, bos);
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addattr_nest_end(n, tail);
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*argc_p = argc;
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*argv_p = argv;
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return 0;
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}
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static int print_mpls(struct action_util *au, FILE *f, struct rtattr *arg)
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{
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struct rtattr *tb[TCA_MPLS_MAX + 1];
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struct tc_mpls *parm;
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SPRINT_BUF(b1);
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__u32 val;
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if (!arg)
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return -1;
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parse_rtattr_nested(tb, TCA_MPLS_MAX, arg);
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if (!tb[TCA_MPLS_PARMS]) {
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fprintf(stderr, "[NULL mpls parameters]\n");
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return -1;
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}
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parm = RTA_DATA(tb[TCA_MPLS_PARMS]);
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print_string(PRINT_ANY, "kind", "%s ", "mpls");
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print_string(PRINT_ANY, "mpls_action", " %s",
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action_names[parm->m_action]);
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switch (parm->m_action) {
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case TCA_MPLS_ACT_POP:
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if (tb[TCA_MPLS_PROTO]) {
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__u16 proto;
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proto = rta_getattr_u16(tb[TCA_MPLS_PROTO]);
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print_string(PRINT_ANY, "protocol", " protocol %s",
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ll_proto_n2a(proto, b1, sizeof(b1)));
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}
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break;
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case TCA_MPLS_ACT_PUSH:
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if (tb[TCA_MPLS_PROTO]) {
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__u16 proto;
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proto = rta_getattr_u16(tb[TCA_MPLS_PROTO]);
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print_string(PRINT_ANY, "protocol", " protocol %s",
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ll_proto_n2a(proto, b1, sizeof(b1)));
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}
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/* Fallthrough */
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case TCA_MPLS_ACT_MODIFY:
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if (tb[TCA_MPLS_LABEL]) {
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val = rta_getattr_u32(tb[TCA_MPLS_LABEL]);
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print_uint(PRINT_ANY, "label", " label %u", val);
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}
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if (tb[TCA_MPLS_TC]) {
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val = rta_getattr_u8(tb[TCA_MPLS_TC]);
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print_uint(PRINT_ANY, "tc", " tc %u", val);
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}
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if (tb[TCA_MPLS_BOS]) {
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val = rta_getattr_u8(tb[TCA_MPLS_BOS]);
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print_uint(PRINT_ANY, "bos", " bos %u", val);
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}
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if (tb[TCA_MPLS_TTL]) {
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val = rta_getattr_u8(tb[TCA_MPLS_TTL]);
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print_uint(PRINT_ANY, "ttl", " ttl %u", val);
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}
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break;
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}
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print_action_control(f, " ", parm->action, "");
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print_uint(PRINT_ANY, "index", "\n\t index %u", parm->index);
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print_int(PRINT_ANY, "ref", " ref %d", parm->refcnt);
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print_int(PRINT_ANY, "bind", " bind %d", parm->bindcnt);
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if (show_stats) {
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if (tb[TCA_MPLS_TM]) {
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struct tcf_t *tm = RTA_DATA(tb[TCA_MPLS_TM]);
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print_tm(f, tm);
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}
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}
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print_string(PRINT_FP, NULL, "%s", _SL_);
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return 0;
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}
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struct action_util mpls_action_util = {
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.id = "mpls",
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.parse_aopt = parse_mpls,
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.print_aopt = print_mpls,
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};
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