Commit a07ea4d9 authored by Johannes Berg's avatar Johannes Berg Committed by David S. Miller

genetlink: no longer support using static family IDs

Static family IDs have never really been used, the only
use case was the workaround I introduced for those users
that assumed their family ID was also their multicast
group ID.

Additionally, because static family IDs would never be
reserved by the generic netlink code, using a relatively
low ID would only work for built-in families that can be
registered immediately after generic netlink is started,
which is basically only the control family (apart from
the workaround code, which I also had to add code for so
it would reserve those IDs)

Thus, anything other than GENL_ID_GENERATE is flawed and
luckily not used except in the cases I mentioned. Move
those workarounds into a few lines of code, and then get
rid of GENL_ID_GENERATE entirely, making it more robust.
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c90c39da
......@@ -83,7 +83,6 @@ static const struct genl_multicast_group acpi_event_mcgrps[] = {
};
static struct genl_family acpi_event_genl_family = {
.id = GENL_ID_GENERATE,
.name = ACPI_GENL_FAMILY_NAME,
.version = ACPI_GENL_VERSION,
.maxattr = ACPI_GENL_ATTR_MAX,
......
......@@ -1095,7 +1095,6 @@ static int gtp_genl_del_pdp(struct sk_buff *skb, struct genl_info *info)
}
static struct genl_family gtp_genl_family = {
.id = GENL_ID_GENERATE,
.name = "gtp",
.version = 0,
.hdrsize = 0,
......
......@@ -1422,7 +1422,6 @@ static void clear_tx_sa(struct macsec_tx_sa *tx_sa)
}
static struct genl_family macsec_fam = {
.id = GENL_ID_GENERATE,
.name = MACSEC_GENL_NAME,
.hdrsize = 0,
.version = MACSEC_GENL_VERSION,
......
......@@ -2151,7 +2151,6 @@ static struct rtnl_link_ops team_link_ops __read_mostly = {
***********************************/
static struct genl_family team_nl_family = {
.id = GENL_ID_GENERATE,
.name = TEAM_GENL_NAME,
.version = TEAM_GENL_VERSION,
.maxattr = TEAM_ATTR_MAX,
......
......@@ -589,7 +589,6 @@ struct hwsim_radiotap_ack_hdr {
/* MAC80211_HWSIM netlinf family */
static struct genl_family hwsim_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = "MAC80211_HWSIM",
.version = 1,
......
......@@ -1369,12 +1369,6 @@ static struct genl_multicast_group pmcraid_mcgrps[] = {
};
static struct genl_family pmcraid_event_family = {
/*
* Due to prior multicast group abuse (the code having assumed that
* the family ID can be used as a multicast group ID) we need to
* statically allocate a family (and thus group) ID.
*/
.id = GENL_ID_PMCRAID,
.name = "pmcraid",
.version = 1,
.maxattr = PMCRAID_AEN_ATTR_MAX,
......
......@@ -148,7 +148,6 @@ static const struct genl_multicast_group tcmu_mcgrps[] = {
/* Our generic netlink family */
static struct genl_family tcmu_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = "TCM-USER",
.version = 1,
......
......@@ -2164,7 +2164,6 @@ static const struct genl_multicast_group thermal_event_mcgrps[] = {
};
static struct genl_family thermal_event_genl_family = {
.id = GENL_ID_GENERATE,
.name = THERMAL_GENL_FAMILY_NAME,
.version = THERMAL_GENL_VERSION,
.maxattr = THERMAL_GENL_ATTR_MAX,
......
......@@ -17,7 +17,6 @@ static uint32_t dlm_nl_seqnum;
static uint32_t listener_nlportid;
static struct genl_family family = {
.id = GENL_ID_GENERATE,
.name = DLM_GENL_NAME,
.version = DLM_GENL_VERSION,
};
......
......@@ -13,13 +13,6 @@ static const struct genl_multicast_group quota_mcgrps[] = {
/* Netlink family structure for quota */
static struct genl_family quota_genl_family = {
/*
* Needed due to multicast group ID abuse - old code assumed
* the family ID was also a valid multicast group ID (which
* isn't true) and userspace might thus rely on it. Assign a
* static ID for this group to make dealing with that easier.
*/
.id = GENL_ID_VFS_DQUOT,
.hdrsize = 0,
.name = "VFS_DQUOT",
.version = 1,
......
......@@ -260,7 +260,6 @@ static struct genl_ops ZZZ_genl_ops[] __read_mostly = {
*/
#define ZZZ_genl_family CONCAT_(GENL_MAGIC_FAMILY, _genl_family)
static struct genl_family ZZZ_genl_family __read_mostly = {
.id = GENL_ID_GENERATE,
.name = __stringify(GENL_MAGIC_FAMILY),
.version = GENL_MAGIC_VERSION,
#ifdef GENL_MAGIC_FAMILY_HDRSZ
......
......@@ -20,7 +20,7 @@ struct genl_info;
/**
* struct genl_family - generic netlink family
* @id: protocol family idenfitier
* @id: protocol family identifier (private)
* @hdrsize: length of user specific header in bytes
* @name: name of family
* @version: protocol version
......@@ -48,7 +48,7 @@ struct genl_info;
* @n_ops: number of operations supported by this family (private)
*/
struct genl_family {
unsigned int id;
unsigned int id; /* private */
unsigned int hdrsize;
char name[GENL_NAMSIZ];
unsigned int version;
......@@ -149,9 +149,6 @@ static inline int genl_register_family(struct genl_family *family)
* Registers the specified family and operations from the specified table.
* Only one family may be registered with the same family name or identifier.
*
* The family id may equal GENL_ID_GENERATE causing an unique id to
* be automatically generated and assigned.
*
* Either a doit or dumpit callback must be specified for every registered
* operation or the function will fail. Only one operation structure per
* command identifier may be registered.
......
......@@ -26,7 +26,6 @@ struct genlmsghdr {
/*
* List of reserved static generic netlink identifiers:
*/
#define GENL_ID_GENERATE 0
#define GENL_ID_CTRL NLMSG_MIN_TYPE
#define GENL_ID_VFS_DQUOT (NLMSG_MIN_TYPE + 1)
#define GENL_ID_PMCRAID (NLMSG_MIN_TYPE + 2)
......
......@@ -42,7 +42,6 @@ static int family_registered;
struct kmem_cache *taskstats_cache;
static struct genl_family family = {
.id = GENL_ID_GENERATE,
.name = TASKSTATS_GENL_NAME,
.version = TASKSTATS_GENL_VERSION,
.maxattr = TASKSTATS_CMD_ATTR_MAX,
......
......@@ -49,7 +49,6 @@
#include "translation-table.h"
struct genl_family batadv_netlink_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = BATADV_NL_NAME,
.version = 1,
......
......@@ -342,7 +342,6 @@ static void devlink_nl_post_doit(const struct genl_ops *ops,
}
static struct genl_family devlink_nl_family = {
.id = GENL_ID_GENERATE,
.name = DEVLINK_GENL_NAME,
.version = DEVLINK_GENL_VERSION,
.maxattr = DEVLINK_ATTR_MAX,
......
......@@ -60,7 +60,6 @@ struct dm_hw_stat_delta {
};
static struct genl_family net_drop_monitor_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = "NET_DM",
.version = 2,
......
......@@ -132,7 +132,6 @@ static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
};
static struct genl_family hsr_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = "HSR",
.version = 1,
......
......@@ -29,7 +29,6 @@ static unsigned int ieee802154_seq_num;
static DEFINE_SPINLOCK(ieee802154_seq_lock);
struct genl_family nl802154_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = IEEE802154_NL_NAME,
.version = 1,
......
......@@ -34,7 +34,6 @@ static void nl802154_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
/* the netlink family */
static struct genl_family nl802154_fam = {
.id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
.name = NL802154_GENL_NAME, /* have users key off the name instead */
.hdrsize = 0, /* no private header */
.version = 1, /* no particular meaning now */
......
......@@ -623,7 +623,6 @@ static int fou_destroy(struct net *net, struct fou_cfg *cfg)
}
static struct genl_family fou_nl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = FOU_GENL_NAME,
.version = FOU_GENL_VERSION,
......
......@@ -743,7 +743,6 @@ void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
}
static struct genl_family tcp_metrics_nl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = TCP_METRICS_GENL_NAME,
.version = TCP_METRICS_GENL_VERSION,
......
......@@ -119,7 +119,6 @@ static const struct rhashtable_params rht_params = {
};
static struct genl_family ila_nl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = ILA_GENL_NAME,
.version = ILA_GENL_VERSION,
......
......@@ -25,7 +25,6 @@
static struct genl_family irda_nl_family = {
.id = GENL_ID_GENERATE,
.name = IRDA_NL_NAME,
.hdrsize = 0,
.version = IRDA_NL_VERSION,
......
......@@ -32,7 +32,6 @@
static struct genl_family l2tp_nl_family = {
.id = GENL_ID_GENERATE,
.name = L2TP_GENL_NAME,
.version = L2TP_GENL_VERSION,
.hdrsize = 0,
......
......@@ -2841,7 +2841,6 @@ static struct nf_sockopt_ops ip_vs_sockopts = {
/* IPVS genetlink family */
static struct genl_family ip_vs_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = IPVS_GENL_NAME,
.version = IPVS_GENL_VERSION,
......
......@@ -61,7 +61,6 @@ struct netlbl_domhsh_walk_arg {
/* NetLabel Generic NETLINK CALIPSO family */
static struct genl_family netlbl_calipso_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_CALIPSO_NAME,
.version = NETLBL_PROTO_VERSION,
......
......@@ -60,7 +60,6 @@ struct netlbl_domhsh_walk_arg {
/* NetLabel Generic NETLINK CIPSOv4 family */
static struct genl_family netlbl_cipsov4_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_CIPSOV4_NAME,
.version = NETLBL_PROTO_VERSION,
......
......@@ -61,7 +61,6 @@ struct netlbl_domhsh_walk_arg {
/* NetLabel Generic NETLINK CIPSOv4 family */
static struct genl_family netlbl_mgmt_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_MGMT_NAME,
.version = NETLBL_PROTO_VERSION,
......
......@@ -124,7 +124,6 @@ static u8 netlabel_unlabel_acceptflg;
/* NetLabel Generic NETLINK unlabeled family */
static struct genl_family netlbl_unlabel_gnl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NETLBL_NLTYPE_UNLABELED_NAME,
.version = NETLBL_PROTO_VERSION,
......
......@@ -349,8 +349,6 @@ static int genl_validate_ops(const struct genl_family *family)
*
* Registers the specified family after validating it first. Only one
* family may be registered with the same family name or identifier.
* The family id may equal GENL_ID_GENERATE causing an unique id to
* be automatically generated and assigned.
*
* The family's ops array must already be assigned, you can use the
* genl_register_family_with_ops() helper function.
......@@ -359,13 +357,7 @@ static int genl_validate_ops(const struct genl_family *family)
*/
int __genl_register_family(struct genl_family *family)
{
int err = -EINVAL, i;
if (family->id && family->id < GENL_MIN_ID)
goto errout;
if (family->id > GENL_MAX_ID)
goto errout;
int err, i;
err = genl_validate_ops(family);
if (err)
......@@ -378,8 +370,27 @@ int __genl_register_family(struct genl_family *family)
goto errout_locked;
}
if (family->id == GENL_ID_GENERATE) {
u16 newid = genl_generate_id();
if (family == &genl_ctrl) {
family->id = GENL_ID_CTRL;
} else {
u16 newid;
/* this should be left zero in the struct */
WARN_ON(family->id);
/*
* Sadly, a few cases need to be special-cased
* due to them having previously abused the API
* and having used their family ID also as their
* multicast group ID, so we use reserved IDs
* for both to be sure we can do that mapping.
*/
if (strcmp(family->name, "pmcraid") == 0)
newid = GENL_ID_PMCRAID;
else if (strcmp(family->name, "VFS_DQUOT") == 0)
newid = GENL_ID_VFS_DQUOT;
else
newid = genl_generate_id();
if (!newid) {
err = -ENOMEM;
......@@ -387,9 +398,6 @@ int __genl_register_family(struct genl_family *family)
}
family->id = newid;
} else if (genl_family_find_byid(family->id)) {
err = -EEXIST;
goto errout_locked;
}
if (family->maxattr && !family->parallel_ops) {
......@@ -419,7 +427,6 @@ int __genl_register_family(struct genl_family *family)
errout_locked:
genl_unlock_all();
errout:
return err;
}
EXPORT_SYMBOL(__genl_register_family);
......
......@@ -39,7 +39,6 @@ static const struct genl_multicast_group nfc_genl_mcgrps[] = {
};
static struct genl_family nfc_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = 0,
.name = NFC_GENL_NAME,
.version = NFC_GENL_VERSION,
......
......@@ -671,7 +671,6 @@ static const struct genl_ops dp_packet_genl_ops[] = {
};
static struct genl_family dp_packet_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_PACKET_FAMILY,
.version = OVS_PACKET_VERSION,
......@@ -1436,7 +1435,6 @@ static const struct genl_ops dp_flow_genl_ops[] = {
};
static struct genl_family dp_flow_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_FLOW_FAMILY,
.version = OVS_FLOW_VERSION,
......@@ -1822,7 +1820,6 @@ static const struct genl_ops dp_datapath_genl_ops[] = {
};
static struct genl_family dp_datapath_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_DATAPATH_FAMILY,
.version = OVS_DATAPATH_VERSION,
......@@ -2244,7 +2241,6 @@ static const struct genl_ops dp_vport_genl_ops[] = {
};
struct genl_family dp_vport_genl_family = {
.id = GENL_ID_GENERATE,
.hdrsize = sizeof(struct ovs_header),
.name = OVS_VPORT_FAMILY,
.version = OVS_VPORT_VERSION,
......
......@@ -136,7 +136,6 @@ const struct nla_policy tipc_nl_udp_policy[TIPC_NLA_UDP_MAX + 1] = {
* so we have a separate genl handling for the new API.
*/
struct genl_family tipc_genl_family = {
.id = GENL_ID_GENERATE,
.name = TIPC_GENL_V2_NAME,
.version = TIPC_GENL_V2_VERSION,
.hdrsize = 0,
......
......@@ -1216,7 +1216,6 @@ static int tipc_nl_compat_recv(struct sk_buff *skb, struct genl_info *info)
}
static struct genl_family tipc_genl_compat_family = {
.id = GENL_ID_GENERATE,
.name = TIPC_GENL_NAME,
.version = TIPC_GENL_VERSION,
.hdrsize = TIPC_GENL_HDRLEN,
......
......@@ -573,7 +573,6 @@ size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);
struct genl_family wimax_gnl_family = {
.id = GENL_ID_GENERATE,
.name = "WiMAX",
.version = WIMAX_GNL_VERSION,
.hdrsize = 0,
......
......@@ -39,7 +39,6 @@ static void nl80211_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
/* the netlink family */
static struct genl_family nl80211_fam = {
.id = GENL_ID_GENERATE, /* don't bother with a hardcoded ID */
.name = NL80211_GENL_NAME, /* have users key off the name instead */
.hdrsize = 0, /* no private header */
.version = 1, /* no particular meaning now */
......
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