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carp: allow commands to use interface name rather than index

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Get/set commands can now choose to provide the interface name rather
than the interface index. This allows userspace to avoid a call to
if_nametoindex().

Suggested by:	melifaro
Reviewed by:	melifaro
Sponsored by:	Rubicon Communications, LLC ("Netgate")
Differential Revision:	https://reviews.freebsd.org/D39359
This commit is contained in:
Kristof Provost 2023-03-31 01:34:03 +02:00
parent 3a0cc6fe61
commit 28921c4f7d
3 changed files with 15 additions and 20 deletions
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18
lib/libifconfig/libifconfig_carp.c
View file

@ -73,17 +73,10 @@ _ifconfig_carp_get(ifconfig_handle_t *h, const char *name,
struct nlmsghdr *hdr;
size_t i = 0;
uint32_t seq_id;
unsigned int ifindex;
int family_id;
ifconfig_error_clear(h);
ifindex = if_nametoindex(name);
if (ifindex == 0) {
ifconfig_error(h, NETLINK, ENOENT);
return (-1);
}
if (! snl_init(&ss, NETLINK_GENERIC)) {
ifconfig_error(h, NETLINK, ENOTSUP);
return (-1);
@ -100,7 +93,7 @@ _ifconfig_carp_get(ifconfig_handle_t *h, const char *name,
hdr = snl_create_genl_msg_request(&nw, family_id, CARP_NL_CMD_GET);
hdr->nlmsg_flags |= NLM_F_DUMP;
snl_add_msg_attr_u32(&nw, CARP_NL_IFINDEX, ifindex);
snl_add_msg_attr_string(&nw, CARP_NL_IFNAME, name);
if (vhid != 0)
snl_add_msg_attr_u32(&nw, CARP_NL_VHID, vhid);
@ -153,18 +146,11 @@ ifconfig_carp_set_info(ifconfig_handle_t *h, const char *name,
struct snl_state ss = {};
struct snl_writer nw;
struct nlmsghdr *hdr;
unsigned int ifindex;
int family_id;
uint32_t seq_id;
ifconfig_error_clear(h);
ifindex = if_nametoindex(name);
if (ifindex == 0) {
ifconfig_error(h, NETLINK, ENOENT);
return (-1);
}
if (! snl_init(&ss, NETLINK_GENERIC)) {
ifconfig_error(h, NETLINK, ENOTSUP);
return (-1);
@ -183,7 +169,7 @@ ifconfig_carp_set_info(ifconfig_handle_t *h, const char *name,
snl_add_msg_attr_u32(&nw, CARP_NL_STATE, carpr->carpr_state);
snl_add_msg_attr_s32(&nw, CARP_NL_ADVBASE, carpr->carpr_advbase);
snl_add_msg_attr_s32(&nw, CARP_NL_ADVSKEW, carpr->carpr_advskew);
snl_add_msg_attr_u32(&nw, CARP_NL_IFINDEX, ifindex);
snl_add_msg_attr_string(&nw, CARP_NL_IFNAME, name);
snl_add_msg_attr(&nw, CARP_NL_ADDR, sizeof(carpr->carpr_addr),
&carpr->carpr_addr);
snl_add_msg_attr(&nw, CARP_NL_ADDR6, sizeof(carpr->carpr_addr6),

16
sys/netinet/ip_carp.c
View file

@ -2301,6 +2301,7 @@ carp_nl_send(void *arg, struct carp_softc *sc, int priv)
struct nl_carp_parsed {
unsigned int ifindex;
char *ifname;
uint32_t state;
uint32_t vhid;
int32_t advbase;
@ -2322,6 +2323,7 @@ static const struct nlattr_parser nla_p_set[] = {
{ .type = CARP_NL_IFINDEX, .off = _OUT(ifindex), .cb = nlattr_get_uint32 },
{ .type = CARP_NL_ADDR, .off = _OUT(addr), .cb = nlattr_get_in_addr },
{ .type = CARP_NL_ADDR6, .off = _OUT(addr6), .cb = nlattr_get_in6_addr },
{ .type = CARP_NL_IFNAME, .off = _OUT(ifname), .cb = nlattr_get_string },
};
static const struct nlfield_parser nlf_p_set[] = {
};
@ -2337,7 +2339,7 @@ carp_nl_get(struct nlmsghdr *hdr, struct nl_pstate *npt)
struct carp_nl_send_args args;
struct carpreq carpr = { };
struct epoch_tracker et;
if_t ifp;
if_t ifp = NULL;
int error;
error = nl_parse_nlmsg(hdr, &carp_parser, npt, &attrs);
@ -2345,7 +2347,10 @@ carp_nl_get(struct nlmsghdr *hdr, struct nl_pstate *npt)
return (error);
NET_EPOCH_ENTER(et);
ifp = ifnet_byindex_ref(attrs.ifindex);
if (attrs.ifname != NULL)
ifp = ifunit_ref(attrs.ifname);
else if (attrs.ifindex != 0)
ifp = ifnet_byindex_ref(attrs.ifindex);
NET_EPOCH_EXIT(et);
if ((error = carp_is_supported_if(ifp)) != 0)
@ -2379,7 +2384,7 @@ carp_nl_set(struct nlmsghdr *hdr, struct nl_pstate *npt)
struct nl_carp_parsed attrs = { };
struct carpkreq carpr;
struct epoch_tracker et;
if_t ifp;
if_t ifp = NULL;
int error;
error = nl_parse_nlmsg(hdr, &carp_parser, npt, &attrs);
@ -2398,7 +2403,10 @@ carp_nl_set(struct nlmsghdr *hdr, struct nl_pstate *npt)
return (EINVAL);
NET_EPOCH_ENTER(et);
ifp = ifnet_byindex_ref(attrs.ifindex);
if (attrs.ifname != NULL)
ifp = ifunit_ref(attrs.ifname);
else if (attrs.ifindex != 0)
ifp = ifnet_byindex_ref(attrs.ifindex);
NET_EPOCH_EXIT(et);
if ((error = carp_is_supported_if(ifp)) != 0)

1
sys/netinet/ip_carp_nl.h
View file

@ -31,6 +31,7 @@ enum carp_nl_type_t {
CARP_NL_IFINDEX = 6, /* u32 */
CARP_NL_ADDR = 7, /* in_addr_t */
CARP_NL_ADDR6 = 8, /* in6_addr_t */
CARP_NL_IFNAME = 9, /* string */
};
#endif