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https://git.proxmox.com/git/mirror_iproute2
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Add support for nexthop objects
Add nexthop subcommand to ip. Implement basic commands for creating,
deleting and dumping nexthop objects. Syntax follows 'nexthop' syntax
from existing 'ip route' command.
Examples:
1. Single path
$ ip nexthop add id 1 via 10.99.1.2 dev veth1
$ ip nexthop ls
id 1 via 10.99.1.2 src 10.99.1.1 dev veth1 scope link
2. ECMP
$ ip nexthop add id 2 via 10.99.3.2 dev veth3
$ ip nexthop add id 1001 group 1/2
--> creates a nexthop group with 2 component nexthops:
id 1 and id 2 both the same weight
$ ip nexthop ls
id 1 via 10.99.1.2 src 10.99.1.1 dev veth1 scope link
id 2 via 10.99.3.2 src 10.99.3.1 dev veth3 scope link
id 1001 group 1/2
3. Weighted multipath
$ ip nexthop add id 1002 group 1,10/2,20
--> creates a nexthop group with 2 component nexthops:
id 1 with a weight of 10 and id 2 with a weight of 20
$ ip nexthop ls
id 1 via 10.99.1.2 src 10.99.1.1 dev veth1 scope link
id 2 via 10.99.3.2 src 10.99.3.1 dev veth3 scope link
id 1001 group 1/2
id 1002 group 1,10/2,20
Signed-off-by: David Ahern <dsahern@gmail.com>
This commit is contained in:
David Ahern
parent
48a1e96d90
commit
63df8e8543
@ -10,7 +10,8 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
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link_iptnl.o link_gre6.o iplink_bond.o iplink_bond_slave.o iplink_hsr.o \
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iplink_bridge.o iplink_bridge_slave.o ipfou.o iplink_ipvlan.o \
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iplink_geneve.o iplink_vrf.o iproute_lwtunnel.o ipmacsec.o ipila.o \
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ipvrf.o iplink_xstats.o ipseg6.o iplink_netdevsim.o iplink_rmnet.o
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ipvrf.o iplink_xstats.o ipseg6.o iplink_netdevsim.o iplink_rmnet.o \
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ipnexthop.o
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RTMONOBJ=rtmon.o
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3
ip/ip.c
3
ip/ip.c
@ -50,7 +50,7 @@ static void usage(void)
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"where OBJECT := { link | address | addrlabel | route | rule | neigh | ntable |\n"
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" tunnel | tuntap | maddress | mroute | mrule | monitor | xfrm |\n"
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" netns | l2tp | fou | macsec | tcp_metrics | token | netconf | ila |\n"
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" vrf | sr }\n"
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" vrf | sr | nexthop }\n"
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" OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |\n"
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" -h[uman-readable] | -iec | -j[son] | -p[retty] |\n"
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" -f[amily] { inet | inet6 | mpls | bridge | link } |\n"
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@ -100,6 +100,7 @@ static const struct cmd {
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{ "netconf", do_ipnetconf },
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{ "vrf", do_ipvrf},
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{ "sr", do_seg6 },
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{ "nexthop", do_ipnh },
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{ "help", do_help },
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{ 0 }
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};
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@ -47,6 +47,7 @@ int print_prefix(struct nlmsghdr *n, void *arg);
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int print_rule(struct nlmsghdr *n, void *arg);
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int print_netconf(struct rtnl_ctrl_data *ctrl,
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struct nlmsghdr *n, void *arg);
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int print_nexthop(struct nlmsghdr *n, void *arg);
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void netns_map_init(void);
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void netns_nsid_socket_init(void);
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int print_nsid(struct nlmsghdr *n, void *arg);
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@ -80,6 +81,7 @@ int do_ipvrf(int argc, char **argv);
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void vrf_reset(void);
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int netns_identify_pid(const char *pidstr, char *name, int len);
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int do_seg6(int argc, char **argv);
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int do_ipnh(int argc, char **argv);
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int iplink_get(char *name, __u32 filt_mask);
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int iplink_ifla_xstats(int argc, char **argv);
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558
ip/ipnexthop.c
Normal file
558
ip/ipnexthop.c
Normal file
@ -0,0 +1,558 @@
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// SPDX-License-Identifier: GPL-2.0
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/*
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* ip nexthop
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*
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* Copyright (c) 2017-19 David Ahern <dsahern@gmail.com>
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*/
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#include <linux/nexthop.h>
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#include <stdio.h>
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#include <string.h>
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#include <rt_names.h>
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#include <errno.h>
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#include "utils.h"
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#include "ip_common.h"
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static struct {
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unsigned int flushed;
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unsigned int groups;
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unsigned int ifindex;
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unsigned int master;
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} filter;
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enum {
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IPNH_LIST,
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IPNH_FLUSH,
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};
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#define RTM_NHA(h) ((struct rtattr *)(((char *)(h)) + \
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NLMSG_ALIGN(sizeof(struct nhmsg))))
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static void usage(void) __attribute__((noreturn));
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static void usage(void)
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{
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fprintf(stderr,
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"Usage: ip nexthop { list | flush } SELECTOR\n"
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" ip nexthop { add | replace } id ID NH [ protocol ID ]\n"
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" ip nexthop { get| del } id ID\n"
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"SELECTOR := [ id ID ] [ dev DEV ] [ vrf NAME ] [ master DEV ]\n"
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" [ groups ]\n"
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"NH := { blackhole | [ via ADDRESS ] [ dev DEV ] [ onlink ]\n"
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" [ encap ENCAPTYPE ENCAPHDR ] | group GROUP ] }\n"
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"GROUP := [ id[,weight]>/<id[,weight]>/... ]\n"
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"ENCAPTYPE := [ mpls ]\n"
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"ENCAPHDR := [ MPLSLABEL ]\n");
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exit(-1);
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}
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static int nh_dump_filter(struct nlmsghdr *nlh, int reqlen)
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{
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int err;
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if (filter.ifindex) {
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err = addattr32(nlh, reqlen, NHA_OIF, filter.ifindex);
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if (err)
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return err;
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}
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if (filter.groups) {
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addattr_l(nlh, reqlen, NHA_GROUPS, NULL, 0);
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if (err)
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return err;
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}
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if (filter.master) {
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addattr32(nlh, reqlen, NHA_MASTER, filter.master);
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if (err)
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return err;
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}
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return 0;
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}
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static struct rtnl_handle rth_del = { .fd = -1 };
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static int delete_nexthop(__u32 id)
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{
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struct {
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struct nlmsghdr n;
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struct nhmsg nhm;
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char buf[64];
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} req = {
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.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct nhmsg)),
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.n.nlmsg_flags = NLM_F_REQUEST,
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.n.nlmsg_type = RTM_DELNEXTHOP,
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.nhm.nh_family = AF_UNSPEC,
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};
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req.n.nlmsg_seq = ++rth_del.seq;
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addattr32(&req.n, sizeof(req), NHA_ID, id);
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if (rtnl_talk(&rth_del, &req.n, NULL) < 0)
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return -1;
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return 0;
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}
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static int flush_nexthop(struct nlmsghdr *nlh, void *arg)
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{
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struct nhmsg *nhm = NLMSG_DATA(nlh);
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struct rtattr *tb[NHA_MAX+1];
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__u32 id = 0;
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int len;
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len = nlh->nlmsg_len - NLMSG_SPACE(sizeof(*nhm));
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if (len < 0) {
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fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
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return -1;
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}
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parse_rtattr(tb, NHA_MAX, RTM_NHA(nhm), len);
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if (tb[NHA_ID])
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id = rta_getattr_u32(tb[NHA_ID]);
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if (id && !delete_nexthop(id))
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filter.flushed++;
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return 0;
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}
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static int ipnh_flush(unsigned int all)
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{
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int rc = -2;
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if (all) {
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filter.groups = 1;
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filter.ifindex = 0;
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filter.master = 0;
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}
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if (rtnl_open(&rth_del, 0) < 0) {
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fprintf(stderr, "Cannot open rtnetlink\n");
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return EXIT_FAILURE;
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}
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again:
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if (rtnl_nexthopdump_req(&rth, preferred_family, nh_dump_filter) < 0) {
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perror("Cannot send dump request");
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goto out;
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}
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if (rtnl_dump_filter(&rth, flush_nexthop, stdout) < 0) {
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fprintf(stderr, "Dump terminated. Failed to flush nexthops\n");
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goto out;
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}
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/* if deleting all, then remove groups first */
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if (all && filter.groups) {
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filter.groups = 0;
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goto again;
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}
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rc = 0;
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out:
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rtnl_close(&rth_del);
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if (!filter.flushed)
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printf("Nothing to flush\n");
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else
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printf("Flushed %d nexthops\n", filter.flushed);
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return rc;
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}
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static void print_nh_group(FILE *fp, const struct rtattr *grps_attr)
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{
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struct nexthop_grp *nhg = RTA_DATA(grps_attr);
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int num = RTA_PAYLOAD(grps_attr) / sizeof(*nhg);
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int i;
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if (!num || num * sizeof(*nhg) != RTA_PAYLOAD(grps_attr)) {
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fprintf(fp, "<invalid nexthop group>");
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return;
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}
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open_json_array(PRINT_JSON, "group");
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print_string(PRINT_FP, NULL, "%s", "group ");
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for (i = 0; i < num; ++i) {
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open_json_object(NULL);
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if (i)
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print_string(PRINT_FP, NULL, "%s", "/");
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print_uint(PRINT_ANY, "id", "%u", nhg[i].id);
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if (nhg[i].weight)
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print_uint(PRINT_ANY, "weight", ",%u", nhg[i].weight + 1);
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close_json_object();
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}
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close_json_array(PRINT_JSON, NULL);
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}
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int print_nexthop(struct nlmsghdr *n, void *arg)
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{
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struct nhmsg *nhm = NLMSG_DATA(n);
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struct rtattr *tb[NHA_MAX+1];
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FILE *fp = (FILE *)arg;
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int len;
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SPRINT_BUF(b1);
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if (n->nlmsg_type != RTM_DELNEXTHOP &&
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n->nlmsg_type != RTM_NEWNEXTHOP) {
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fprintf(stderr, "Not a nexthop: %08x %08x %08x\n",
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n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
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return -1;
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}
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len = n->nlmsg_len - NLMSG_SPACE(sizeof(*nhm));
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if (len < 0) {
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close_json_object();
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fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
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return -1;
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}
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parse_rtattr(tb, NHA_MAX, RTM_NHA(nhm), len);
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open_json_object(NULL);
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if (n->nlmsg_type == RTM_DELROUTE)
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print_bool(PRINT_ANY, "deleted", "Deleted ", true);
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if (tb[NHA_ID])
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print_uint(PRINT_ANY, "id", "id %u ",
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rta_getattr_u32(tb[NHA_ID]));
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if (tb[NHA_GROUP])
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print_nh_group(fp, tb[NHA_GROUP]);
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if (tb[NHA_ENCAP])
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lwt_print_encap(fp, tb[NHA_ENCAP_TYPE], tb[NHA_ENCAP]);
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if (tb[NHA_GATEWAY])
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print_rta_gateway(fp, nhm->nh_family, tb[NHA_GATEWAY]);
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if (tb[NHA_OIF])
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print_rta_if(fp, tb[NHA_OIF], "dev");
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if (nhm->nh_scope != RT_SCOPE_UNIVERSE || show_details > 0) {
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print_string(PRINT_ANY, "scope", "scope %s ",
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rtnl_rtscope_n2a(nhm->nh_scope, b1, sizeof(b1)));
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}
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if (tb[NHA_BLACKHOLE])
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print_null(PRINT_ANY, "blackhole", "blackhole", NULL);
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if (nhm->nh_protocol != RTPROT_UNSPEC || show_details > 0) {
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print_string(PRINT_ANY, "protocol", "proto %s ",
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rtnl_rtprot_n2a(nhm->nh_protocol, b1, sizeof(b1)));
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}
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if (tb[NHA_OIF])
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print_rt_flags(fp, nhm->nh_flags);
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print_string(PRINT_FP, NULL, "%s", "\n");
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close_json_object();
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fflush(fp);
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return 0;
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}
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static int add_nh_group_attr(struct nlmsghdr *n, int maxlen, char *argv)
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{
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struct nexthop_grp *grps;
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int count = 0, i;
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char *sep, *wsep;
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if (*argv != '\0')
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count = 1;
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/* separator is '/' */
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sep = strchr(argv, '/');
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while (sep) {
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count++;
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sep = strchr(sep + 1, '/');
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}
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if (count == 0)
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return -1;
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grps = calloc(count, sizeof(*grps));
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if (!grps)
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return -1;
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for (i = 0; i < count; ++i) {
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sep = strchr(argv, '/');
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if (sep)
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*sep = '\0';
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wsep = strchr(argv, ',');
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if (wsep)
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*wsep = '\0';
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if (get_unsigned(&grps[i].id, argv, 0))
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return -1;
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if (wsep) {
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unsigned int w;
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wsep++;
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if (get_unsigned(&w, wsep, 0) || w == 0 || w > 256)
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invarg("\"weight\" is invalid\n", wsep);
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grps[i].weight = w - 1;
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}
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if (!sep)
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break;
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argv = sep + 1;
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}
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return addattr_l(n, maxlen, NHA_GROUP, grps, count * sizeof(*grps));
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}
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static int ipnh_modify(int cmd, unsigned int flags, int argc, char **argv)
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{
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struct {
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struct nlmsghdr n;
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struct nhmsg nhm;
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char buf[1024];
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} req = {
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.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct nhmsg)),
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.n.nlmsg_flags = NLM_F_REQUEST | flags,
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.n.nlmsg_type = cmd,
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.nhm.nh_family = preferred_family,
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};
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__u32 nh_flags = 0;
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while (argc > 0) {
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if (!strcmp(*argv, "id")) {
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__u32 id;
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NEXT_ARG();
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if (get_unsigned(&id, *argv, 0))
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invarg("invalid id value", *argv);
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addattr32(&req.n, sizeof(req), NHA_ID, id);
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} else if (!strcmp(*argv, "dev")) {
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int ifindex;
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NEXT_ARG();
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ifindex = ll_name_to_index(*argv);
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if (!ifindex)
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invarg("Device does not exist\n", *argv);
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addattr32(&req.n, sizeof(req), NHA_OIF, ifindex);
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if (req.nhm.nh_family == AF_UNSPEC)
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req.nhm.nh_family = AF_INET;
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} else if (strcmp(*argv, "via") == 0) {
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inet_prefix addr;
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int family;
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NEXT_ARG();
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family = read_family(*argv);
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if (family == AF_UNSPEC)
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family = req.nhm.nh_family;
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else
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NEXT_ARG();
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get_addr(&addr, *argv, family);
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if (req.nhm.nh_family == AF_UNSPEC)
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req.nhm.nh_family = addr.family;
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else if (req.nhm.nh_family != addr.family)
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invarg("address family mismatch\n", *argv);
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addattr_l(&req.n, sizeof(req), NHA_GATEWAY,
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&addr.data, addr.bytelen);
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} else if (strcmp(*argv, "encap") == 0) {
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char buf[1024];
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struct rtattr *rta = (void *)buf;
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rta->rta_type = NHA_ENCAP;
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rta->rta_len = RTA_LENGTH(0);
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lwt_parse_encap(rta, sizeof(buf), &argc, &argv,
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NHA_ENCAP, NHA_ENCAP_TYPE);
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if (rta->rta_len > RTA_LENGTH(0)) {
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addraw_l(&req.n, 1024, RTA_DATA(rta),
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RTA_PAYLOAD(rta));
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}
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} else if (!strcmp(*argv, "blackhole")) {
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addattr_l(&req.n, sizeof(req), NHA_BLACKHOLE, NULL, 0);
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if (req.nhm.nh_family == AF_UNSPEC)
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req.nhm.nh_family = AF_INET;
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} else if (!strcmp(*argv, "onlink")) {
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nh_flags |= RTNH_F_ONLINK;
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} else if (!strcmp(*argv, "group")) {
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NEXT_ARG();
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if (add_nh_group_attr(&req.n, sizeof(req), *argv))
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invarg("\"group\" value is invalid\n", *argv);
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} else if (matches(*argv, "protocol") == 0) {
|
||||
__u32 prot;
|
||||
|
||||
NEXT_ARG();
|
||||
if (rtnl_rtprot_a2n(&prot, *argv))
|
||||
invarg("\"protocol\" value is invalid\n", *argv);
|
||||
req.nhm.nh_protocol = prot;
|
||||
} else if (strcmp(*argv, "help") == 0) {
|
||||
usage();
|
||||
} else {
|
||||
invarg("", *argv);
|
||||
}
|
||||
argc--; argv++;
|
||||
}
|
||||
|
||||
req.nhm.nh_flags = nh_flags;
|
||||
|
||||
if (rtnl_talk(&rth, &req.n, NULL) < 0)
|
||||
return -2;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ipnh_get_id(__u32 id)
|
||||
{
|
||||
struct {
|
||||
struct nlmsghdr n;
|
||||
struct nhmsg nhm;
|
||||
char buf[1024];
|
||||
} req = {
|
||||
.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct nhmsg)),
|
||||
.n.nlmsg_flags = NLM_F_REQUEST,
|
||||
.n.nlmsg_type = RTM_GETNEXTHOP,
|
||||
.nhm.nh_family = preferred_family,
|
||||
};
|
||||
struct nlmsghdr *answer;
|
||||
|
||||
addattr32(&req.n, sizeof(req), NHA_ID, id);
|
||||
|
||||
if (rtnl_talk(&rth, &req.n, &answer) < 0)
|
||||
return -2;
|
||||
|
||||
new_json_obj(json);
|
||||
|
||||
if (print_nexthop(answer, (void *)stdout) < 0) {
|
||||
free(answer);
|
||||
return -1;
|
||||
}
|
||||
|
||||
delete_json_obj();
|
||||
fflush(stdout);
|
||||
|
||||
free(answer);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ipnh_list_flush(int argc, char **argv, int action)
|
||||
{
|
||||
unsigned int all = (argc == 0);
|
||||
|
||||
while (argc > 0) {
|
||||
if (!matches(*argv, "dev")) {
|
||||
NEXT_ARG();
|
||||
filter.ifindex = ll_name_to_index(*argv);
|
||||
if (!filter.ifindex)
|
||||
invarg("Device does not exist\n", *argv);
|
||||
} else if (!matches(*argv, "groups")) {
|
||||
filter.groups = 1;
|
||||
} else if (!matches(*argv, "master")) {
|
||||
NEXT_ARG();
|
||||
filter.master = ll_name_to_index(*argv);
|
||||
if (!filter.master)
|
||||
invarg("Device does not exist\n", *argv);
|
||||
} else if (matches(*argv, "vrf") == 0) {
|
||||
NEXT_ARG();
|
||||
if (!name_is_vrf(*argv))
|
||||
invarg("Invalid VRF\n", *argv);
|
||||
filter.master = ll_name_to_index(*argv);
|
||||
if (!filter.master)
|
||||
invarg("VRF does not exist\n", *argv);
|
||||
} else if (!strcmp(*argv, "id")) {
|
||||
__u32 id;
|
||||
|
||||
NEXT_ARG();
|
||||
if (get_unsigned(&id, *argv, 0))
|
||||
invarg("invalid id value", *argv);
|
||||
return ipnh_get_id(id);
|
||||
} else if (matches(*argv, "help") == 0) {
|
||||
usage();
|
||||
} else {
|
||||
invarg("", *argv);
|
||||
}
|
||||
argc--; argv++;
|
||||
}
|
||||
|
||||
if (action == IPNH_FLUSH)
|
||||
return ipnh_flush(all);
|
||||
|
||||
if (rtnl_nexthopdump_req(&rth, preferred_family, nh_dump_filter) < 0) {
|
||||
perror("Cannot send dump request");
|
||||
return -2;
|
||||
}
|
||||
|
||||
new_json_obj(json);
|
||||
|
||||
if (rtnl_dump_filter(&rth, print_nexthop, stdout) < 0) {
|
||||
fprintf(stderr, "Dump terminated\n");
|
||||
return -2;
|
||||
}
|
||||
|
||||
delete_json_obj();
|
||||
fflush(stdout);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int ipnh_get(int argc, char **argv)
|
||||
{
|
||||
__u32 id = 0;
|
||||
|
||||
while (argc > 0) {
|
||||
if (!strcmp(*argv, "id")) {
|
||||
NEXT_ARG();
|
||||
if (get_unsigned(&id, *argv, 0))
|
||||
invarg("invalid id value", *argv);
|
||||
} else {
|
||||
usage();
|
||||
}
|
||||
argc--; argv++;
|
||||
}
|
||||
|
||||
if (!id) {
|
||||
usage();
|
||||
return -1;
|
||||
}
|
||||
|
||||
return ipnh_get_id(id);
|
||||
}
|
||||
|
||||
int do_ipnh(int argc, char **argv)
|
||||
{
|
||||
if (argc < 1)
|
||||
return ipnh_list_flush(0, NULL, IPNH_LIST);
|
||||
|
||||
if (!matches(*argv, "add"))
|
||||
return ipnh_modify(RTM_NEWNEXTHOP, NLM_F_CREATE|NLM_F_EXCL,
|
||||
argc-1, argv+1);
|
||||
if (!matches(*argv, "replace"))
|
||||
return ipnh_modify(RTM_NEWNEXTHOP, NLM_F_CREATE|NLM_F_REPLACE,
|
||||
argc-1, argv+1);
|
||||
if (!matches(*argv, "delete"))
|
||||
return ipnh_modify(RTM_DELNEXTHOP, 0, argc-1, argv+1);
|
||||
|
||||
if (!matches(*argv, "list") ||
|
||||
!matches(*argv, "show") ||
|
||||
!matches(*argv, "lst"))
|
||||
return ipnh_list_flush(argc-1, argv+1, IPNH_LIST);
|
||||
|
||||
if (!matches(*argv, "get"))
|
||||
return ipnh_get(argc-1, argv+1);
|
||||
|
||||
if (!matches(*argv, "flush"))
|
||||
return ipnh_list_flush(argc-1, argv+1, IPNH_FLUSH);
|
||||
|
||||
if (!matches(*argv, "help"))
|
||||
usage();
|
||||
|
||||
fprintf(stderr,
|
||||
"Command \"%s\" is unknown, try \"ip nexthop help\".\n", *argv);
|
||||
exit(-1);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user