diff options
Diffstat (limited to 'ip/iplink_bareudp.c')
| -rw-r--r-- | ip/iplink_bareudp.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/ip/iplink_bareudp.c b/ip/iplink_bareudp.c new file mode 100644 index 0000000..aa31110 --- /dev/null +++ b/ip/iplink_bareudp.c @@ -0,0 +1,152 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#include <stdio.h> +#include <linux/if_ether.h> +#include <linux/if_link.h> +#include <linux/netlink.h> +#include <linux/rtnetlink.h> + +#include "libnetlink.h" +#include "rt_names.h" +#include "utils.h" +#include "ip_common.h" +#include "json_print.h" + +#define BAREUDP_ATTRSET(attrs, type) (((attrs) & (1L << (type))) != 0) + +static void print_explain(FILE *f) +{ + fprintf(f, + "Usage: ... bareudp dstport PORT\n" + " ethertype PROTO\n" + " [ srcportmin PORT ]\n" + " [ [no]multiproto ]\n" + "\n" + "Where: PORT := UDP_PORT\n" + " PROTO := ETHERTYPE\n" + "\n" + "Note: ETHERTYPE can be given as number or as protocol name (\"ipv4\", \"ipv6\",\n" + " \"mpls_uc\", etc.).\n" + ); +} + +static void explain(void) +{ + print_explain(stderr); +} + +static void check_duparg(__u64 *attrs, int type, const char *key, + const char *argv) +{ + if (!BAREUDP_ATTRSET(*attrs, type)) { + *attrs |= (1L << type); + return; + } + duparg2(key, argv); +} + +static int bareudp_parse_opt(struct link_util *lu, int argc, char **argv, + struct nlmsghdr *n) +{ + bool multiproto = false; + __u16 srcportmin = 0; + __be16 ethertype = 0; + __be16 dstport = 0; + __u64 attrs = 0; + + while (argc > 0) { + if (matches(*argv, "dstport") == 0) { + NEXT_ARG(); + check_duparg(&attrs, IFLA_BAREUDP_PORT, "dstport", + *argv); + if (get_be16(&dstport, *argv, 0)) + invarg("dstport", *argv); + } else if (matches(*argv, "ethertype") == 0) { + NEXT_ARG(); + check_duparg(&attrs, IFLA_BAREUDP_ETHERTYPE, + "ethertype", *argv); + if (ll_proto_a2n(ðertype, *argv)) + invarg("ethertype", *argv); + } else if (matches(*argv, "srcportmin") == 0) { + NEXT_ARG(); + check_duparg(&attrs, IFLA_BAREUDP_SRCPORT_MIN, + "srcportmin", *argv); + if (get_u16(&srcportmin, *argv, 0)) + invarg("srcportmin", *argv); + } else if (matches(*argv, "multiproto") == 0) { + check_duparg(&attrs, IFLA_BAREUDP_MULTIPROTO_MODE, + *argv, *argv); + multiproto = true; + } else if (matches(*argv, "nomultiproto") == 0) { + check_duparg(&attrs, IFLA_BAREUDP_MULTIPROTO_MODE, + *argv, *argv); + multiproto = false; + } else if (matches(*argv, "help") == 0) { + explain(); + return -1; + } else { + fprintf(stderr, "bareudp: unknown command \"%s\"?\n", + *argv); + explain(); + return -1; + } + argc--, argv++; + } + + if (!BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_PORT)) + missarg("dstport"); + if (!BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_ETHERTYPE)) + missarg("ethertype"); + + addattr16(n, 1024, IFLA_BAREUDP_PORT, dstport); + addattr16(n, 1024, IFLA_BAREUDP_ETHERTYPE, ethertype); + if (BAREUDP_ATTRSET(attrs, IFLA_BAREUDP_SRCPORT_MIN)) + addattr16(n, 1024, IFLA_BAREUDP_SRCPORT_MIN, srcportmin); + if (multiproto) + addattr(n, 1024, IFLA_BAREUDP_MULTIPROTO_MODE); + + return 0; +} + +static void bareudp_print_opt(struct link_util *lu, FILE *f, + struct rtattr *tb[]) +{ + if (!tb) + return; + + if (tb[IFLA_BAREUDP_PORT]) + print_uint(PRINT_ANY, "dstport", "dstport %u ", + rta_getattr_be16(tb[IFLA_BAREUDP_PORT])); + + if (tb[IFLA_BAREUDP_ETHERTYPE]) { + struct rtattr *attr = tb[IFLA_BAREUDP_ETHERTYPE]; + SPRINT_BUF(ethertype); + + print_string(PRINT_ANY, "ethertype", "ethertype %s ", + ll_proto_n2a(rta_getattr_u16(attr), + ethertype, sizeof(ethertype))); + } + + if (tb[IFLA_BAREUDP_SRCPORT_MIN]) + print_uint(PRINT_ANY, "srcportmin", "srcportmin %u ", + rta_getattr_u16(tb[IFLA_BAREUDP_SRCPORT_MIN])); + + if (tb[IFLA_BAREUDP_MULTIPROTO_MODE]) + print_bool(PRINT_ANY, "multiproto", "multiproto ", true); + else + print_bool(PRINT_ANY, "multiproto", "nomultiproto ", false); +} + +static void bareudp_print_help(struct link_util *lu, int argc, char **argv, + FILE *f) +{ + print_explain(f); +} + +struct link_util bareudp_link_util = { + .id = "bareudp", + .maxattr = IFLA_BAREUDP_MAX, + .parse_opt = bareudp_parse_opt, + .print_opt = bareudp_print_opt, + .print_help = bareudp_print_help, +}; |