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ifconfig: Add netlink support for gif(4)
This implementation does not cover tunnel addresses. Differential Revision: https://reviews.freebsd.org/D57667
This commit is contained in:
Pouria Mousavizadeh Tehrani committed
1 parent
9bfb78bf63
commit
5bb8119150
1 file changed
+194
@@ -36,7 +36,9 @@
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_gif.h>
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#ifdef WITHOUT_NETLINK
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#include <net/route.h>
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#endif
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#include <ctype.h>
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#include <stdio.h>
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@@ -48,11 +50,195 @@
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#include "ifconfig.h"
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#ifndef WITHOUT_NETLINK
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#include "ifconfig_netlink.h"
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#endif
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static const char *GIFBITS[] = {
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[0] = "NOCLAMP",
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[1] = "IGNORE_SOURCE",
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};
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#ifndef WITHOUT_NETLINK
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struct nl_parsed_gif {
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uint32_t ifla_flags;
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};
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struct nla_gif_info {
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const char *kind;
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struct nl_parsed_gif data;
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};
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struct nla_gif_link {
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uint32_t ifi_index;
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struct nla_gif_info linkinfo;
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};
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static inline void
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gif_nl_init(if_ctx *ctx, struct snl_writer *nw, uint32_t flags)
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{
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struct nlmsghdr *hdr;
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snl_init_writer(ctx->io_ss, nw);
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hdr = snl_create_msg_request(nw, NL_RTM_NEWLINK);
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hdr->nlmsg_flags |= flags;
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snl_reserve_msg_object(nw, struct ifinfomsg);
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snl_add_msg_attr_string(nw, IFLA_IFNAME, ctx->ifname);
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}
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static inline void
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gif_nl_fini(if_ctx *ctx, struct snl_writer *nw)
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{
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struct nlmsghdr *hdr;
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struct snl_errmsg_data errmsg = {};
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hdr = snl_finalize_msg(nw);
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if (hdr == NULL || !snl_send_message(ctx->io_ss, hdr))
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err(1, "unable to send netlink message");
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if (!snl_read_reply_code(ctx->io_ss, hdr->nlmsg_seq, &errmsg))
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errx(errmsg.error, "%s", errmsg.error_str);
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}
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#define _OUT(_field) offsetof(struct nl_parsed_gif, _field)
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static const struct snl_attr_parser nla_p_gif[] = {
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{ .type = IFLA_IPTUN_FLAGS, .off = _OUT(ifla_flags), .cb = snl_attr_get_uint32 },
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};
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#undef _OUT
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SNL_DECLARE_ATTR_PARSER(gif_linkinfo_data_parser, nla_p_gif);
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#define _OUT(_field) offsetof(struct nla_gif_info, _field)
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static const struct snl_attr_parser ap_gif_linkinfo[] = {
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{ .type = IFLA_INFO_KIND, .off = _OUT(kind), .cb = snl_attr_get_string },
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{ .type = IFLA_INFO_DATA, .off = _OUT(data),
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.arg = &gif_linkinfo_data_parser, .cb = snl_attr_get_nested },
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};
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#undef _OUT
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SNL_DECLARE_ATTR_PARSER(gif_linkinfo_parser, ap_gif_linkinfo);
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#define _IN(_field) offsetof(struct ifinfomsg, _field)
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#define _OUT(_field) offsetof(struct nla_gif_link, _field)
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static const struct snl_attr_parser ap_gif_link[] = {
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{ .type = IFLA_LINKINFO, .off = _OUT(linkinfo),
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.arg = &gif_linkinfo_parser, .cb = snl_attr_get_nested },
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};
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static const struct snl_field_parser fp_geneve_link[] = {
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{ .off_in = _IN(ifi_index), .off_out = _OUT(ifi_index),
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.cb = snl_field_get_uint32 },
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};
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#undef _IN
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#undef _OUT
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SNL_DECLARE_PARSER(gif_parser, struct ifinfomsg, fp_geneve_link, ap_gif_link);
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static const struct snl_hdr_parser *all_parsers[] = {
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&gif_linkinfo_data_parser,
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&gif_linkinfo_parser,
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&gif_parser,
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};
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static void
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gif_status_nl(if_ctx *ctx)
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{
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struct snl_writer nw;
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struct nlmsghdr *hdr;
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struct snl_errmsg_data errmsg = {};
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struct nla_gif_link gif_link;
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if (strncmp(ctx->ifname, "gif", sizeof("gif") - 1) != 0)
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return;
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snl_init_writer(ctx->io_ss, &nw);
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hdr = snl_create_msg_request(&nw, NL_RTM_GETLINK);
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hdr->nlmsg_flags |= NLM_F_DUMP;
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snl_reserve_msg_object(&nw, struct ifinfomsg);
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snl_add_msg_attr_string(&nw, IFLA_IFNAME, ctx->ifname);
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hdr = snl_finalize_msg(&nw);
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if (hdr == NULL || !snl_send_message(ctx->io_ss, hdr))
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err(1, "unable to send netlink message");
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hdr = snl_read_reply(ctx->io_ss, hdr->nlmsg_seq);
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if (hdr->nlmsg_type != NL_RTM_NEWLINK) {
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if (!snl_parse_errmsg(ctx->io_ss, hdr, &errmsg))
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errx(EINVAL, "(NETLINK)");
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if (errmsg.error_str != NULL)
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errx(errmsg.error, "(NETLINK) %s", errmsg.error_str);
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}
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if (!snl_parse_nlmsg(ctx->io_ss, hdr, &gif_parser, &gif_link))
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return;
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struct nla_gif_info gif_info = gif_link.linkinfo;
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struct nl_parsed_gif gif_data = gif_info.data;
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if (gif_data.ifla_flags == 0)
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return;
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printf("\toptions=%x", gif_data.ifla_flags);
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print_bits("options", &gif_data.ifla_flags, 1, GIFBITS, nitems(GIFBITS));
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putchar('\n');
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}
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static void
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setgifopts_nl(if_ctx *ctx, const char *val __unused, int d)
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{
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struct snl_writer nw = {};
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struct nlmsghdr *hdr;
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struct snl_errmsg_data errmsg = {};
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struct nla_gif_link gif_link = {};
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int off, off2;
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snl_init_writer(ctx->io_ss, &nw);
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hdr = snl_create_msg_request(&nw, NL_RTM_GETLINK);
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hdr->nlmsg_flags |= NLM_F_DUMP;
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snl_reserve_msg_object(&nw, struct ifinfomsg);
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snl_add_msg_attr_string(&nw, IFLA_IFNAME, ctx->ifname);
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hdr = snl_finalize_msg(&nw);
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if (hdr == NULL || (!snl_send_message(ctx->io_ss, hdr)))
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err(1, "unable to send netlink message");
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hdr = snl_read_reply(ctx->io_ss, hdr->nlmsg_seq);
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if (hdr->nlmsg_type != NL_RTM_GETLINK) {
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if (!snl_parse_errmsg(ctx->io_ss, hdr, &errmsg))
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errx(EINVAL, "(NETLINK)");
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if (errmsg.error_str != NULL)
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errx(errmsg.error, "(NETLINK) %s", errmsg.error_str);
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}
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if (!snl_parse_nlmsg(ctx->io_ss, hdr, &gif_parser, &gif_link))
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return;
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struct nla_gif_info gif_info = gif_link.linkinfo;
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struct nl_parsed_gif gif_data = gif_info.data;
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if (d < 0)
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gif_data.ifla_flags &= ~(-d);
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else
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gif_data.ifla_flags |= d;
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gif_nl_init(ctx, &nw, 0);
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off = snl_add_msg_attr_nested(&nw, IFLA_LINKINFO);
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snl_add_msg_attr_string(&nw, IFLA_INFO_KIND, "gif");
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off2 = snl_add_msg_attr_nested(&nw, IFLA_INFO_DATA);
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snl_add_msg_attr_u32(&nw, IFLA_IPTUN_FLAGS, gif_data.ifla_flags);
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snl_end_attr_nested(&nw, off2);
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snl_end_attr_nested(&nw, off);
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gif_nl_fini(ctx, &nw);
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}
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static struct cmd gif_cmds[] = {
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DEF_CMD("noclamp", GIF_NOCLAMP, setgifopts_nl),
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DEF_CMD("-noclamp", -GIF_NOCLAMP, setgifopts_nl),
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DEF_CMD("ignore_source", GIF_IGNORE_SOURCE, setgifopts_nl),
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DEF_CMD("-ignore_source", -GIF_IGNORE_SOURCE, setgifopts_nl),
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};
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#else
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static void
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gif_status(if_ctx *ctx)
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{
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@@ -96,11 +282,16 @@ static struct cmd gif_cmds[] = {
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DEF_CMD("ignore_source", GIF_IGNORE_SOURCE, setgifopts),
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DEF_CMD("-ignore_source", -GIF_IGNORE_SOURCE, setgifopts),
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};
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#endif /* !WITHOUT_NETLINK */
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static struct afswtch af_gif = {
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.af_name = "af_gif",
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.af_af = AF_UNSPEC,
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#ifndef WITHOUT_NETLINK
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.af_other_status = gif_status_nl,
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#else
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.af_other_status = gif_status,
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#endif
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};
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static __constructor void
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@@ -111,4 +302,7 @@ gif_ctor(void)
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for (i = 0; i < nitems(gif_cmds); i++)
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cmd_register(&gif_cmds[i]);
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af_register(&af_gif);
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#ifndef WITHOUT_NETLINK
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SNL_VERIFY_PARSERS(all_parsers);
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#endif
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}
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