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netlink: remove NLA_EXACT_LEN_WARN
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Use a validation type instead, so we can later expose
the NLA_* values to userspace for policy descriptions.

Some transformations were done with this spatch:

    @@
    identifier p;
    expression X, L, A;
    @@
    struct nla_policy p[X] = {
    [A] =
    -{ .type = NLA_EXACT_LEN_WARN, .len = L },
    +NLA_POLICY_EXACT_LEN_WARN(L),
    ...
    };

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Johannes Berg authored and David S. Miller committed May 1, 2020
1 parent da4063b commit c7721c0
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Showing 3 changed files with 36 additions and 76 deletions.
15 changes: 8 additions & 7 deletions include/net/netlink.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -182,7 +182,6 @@ enum {
NLA_BITFIELD32,
NLA_REJECT,
NLA_EXACT_LEN,
NLA_EXACT_LEN_WARN,
NLA_MIN_LEN,
__NLA_TYPE_MAX,
};
Expand All @@ -204,6 +203,7 @@ enum nla_policy_validation {
NLA_VALIDATE_MAX,
NLA_VALIDATE_RANGE_PTR,
NLA_VALIDATE_FUNCTION,
NLA_VALIDATE_WARN_TOO_LONG,
};

/**
Expand Down Expand Up @@ -237,10 +237,10 @@ enum nla_policy_validation {
* just like "All other"
* NLA_BITFIELD32 Unused
* NLA_REJECT Unused
* NLA_EXACT_LEN Attribute must have exactly this length, otherwise
* it is rejected.
* NLA_EXACT_LEN_WARN Attribute should have exactly this length, a warning
* is logged if it is longer, shorter is rejected.
* NLA_EXACT_LEN Attribute should have exactly this length, otherwise
* it is rejected or warned about, the latter happening
* if and only if the `validation_type' is set to
* NLA_VALIDATE_WARN_TOO_LONG.
* NLA_MIN_LEN Minimum length of attribute payload
* All other Minimum length of attribute payload
*
Expand Down Expand Up @@ -350,8 +350,9 @@ struct nla_policy {
};

#define NLA_POLICY_EXACT_LEN(_len) { .type = NLA_EXACT_LEN, .len = _len }
#define NLA_POLICY_EXACT_LEN_WARN(_len) { .type = NLA_EXACT_LEN_WARN, \
.len = _len }
#define NLA_POLICY_EXACT_LEN_WARN(_len) \
{ .type = NLA_EXACT_LEN, .len = _len, \
.validation_type = NLA_VALIDATE_WARN_TOO_LONG, }
#define NLA_POLICY_MIN_LEN(_len) { .type = NLA_MIN_LEN, .len = _len }

#define NLA_POLICY_ETH_ADDR NLA_POLICY_EXACT_LEN(ETH_ALEN)
Expand Down
16 changes: 10 additions & 6 deletions lib/nlattr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -261,7 +261,9 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
BUG_ON(pt->type > NLA_TYPE_MAX);

if ((nla_attr_len[pt->type] && attrlen != nla_attr_len[pt->type]) ||
(pt->type == NLA_EXACT_LEN_WARN && attrlen != pt->len)) {
(pt->type == NLA_EXACT_LEN &&
pt->validation_type == NLA_VALIDATE_WARN_TOO_LONG &&
attrlen != pt->len)) {
pr_warn_ratelimited("netlink: '%s': attribute type %d has an invalid length.\n",
current->comm, type);
if (validate & NL_VALIDATE_STRICT_ATTRS) {
Expand All @@ -287,11 +289,6 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
}

switch (pt->type) {
case NLA_EXACT_LEN:
if (attrlen != pt->len)
goto out_err;
break;

case NLA_REJECT:
if (extack && pt->reject_message) {
NL_SET_BAD_ATTR(extack, nla);
Expand Down Expand Up @@ -405,6 +402,13 @@ static int validate_nla(const struct nlattr *nla, int maxtype,
goto out_err;
break;

case NLA_EXACT_LEN:
if (pt->validation_type != NLA_VALIDATE_WARN_TOO_LONG) {
if (attrlen != pt->len)
goto out_err;
break;
}
/* fall through */
default:
if (pt->len)
minlen = pt->len;
Expand Down
81 changes: 18 additions & 63 deletions net/wireless/nl80211.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -376,11 +376,8 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },

[NL80211_ATTR_MAC] = { .type = NLA_EXACT_LEN_WARN, .len = ETH_ALEN },
[NL80211_ATTR_PREV_BSSID] = {
.type = NLA_EXACT_LEN_WARN,
.len = ETH_ALEN
},
[NL80211_ATTR_MAC] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_ATTR_PREV_BSSID] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),

[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
[NL80211_ATTR_KEY_DATA] = { .type = NLA_BINARY,
Expand Down Expand Up @@ -432,10 +429,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_MESH_CONFIG] = { .type = NLA_NESTED },
[NL80211_ATTR_SUPPORT_MESH_AUTH] = { .type = NLA_FLAG },

[NL80211_ATTR_HT_CAPABILITY] = {
.type = NLA_EXACT_LEN_WARN,
.len = NL80211_HT_CAPABILITY_LEN
},
[NL80211_ATTR_HT_CAPABILITY] = NLA_POLICY_EXACT_LEN_WARN(NL80211_HT_CAPABILITY_LEN),

[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
[NL80211_ATTR_IE] = NLA_POLICY_VALIDATE_FN(NLA_BINARY,
Expand Down Expand Up @@ -466,10 +460,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
[NL80211_ATTR_PID] = { .type = NLA_U32 },
[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
[NL80211_ATTR_PMKID] = {
.type = NLA_EXACT_LEN_WARN,
.len = WLAN_PMKID_LEN
},
[NL80211_ATTR_PMKID] = NLA_POLICY_EXACT_LEN_WARN(WLAN_PMKID_LEN),
[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
Expand Down Expand Up @@ -533,10 +524,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_WDEV] = { .type = NLA_U64 },
[NL80211_ATTR_USER_REG_HINT_TYPE] = { .type = NLA_U32 },
[NL80211_ATTR_AUTH_DATA] = { .type = NLA_BINARY, },
[NL80211_ATTR_VHT_CAPABILITY] = {
.type = NLA_EXACT_LEN_WARN,
.len = NL80211_VHT_CAPABILITY_LEN
},
[NL80211_ATTR_VHT_CAPABILITY] = NLA_POLICY_EXACT_LEN_WARN(NL80211_VHT_CAPABILITY_LEN),
[NL80211_ATTR_SCAN_FLAGS] = { .type = NLA_U32 },
[NL80211_ATTR_P2P_CTWINDOW] = NLA_POLICY_MAX(NLA_U8, 127),
[NL80211_ATTR_P2P_OPPPS] = NLA_POLICY_MAX(NLA_U8, 1),
Expand Down Expand Up @@ -574,10 +562,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
[NL80211_ATTR_QOS_MAP] = { .type = NLA_BINARY,
.len = IEEE80211_QOS_MAP_LEN_MAX },
[NL80211_ATTR_MAC_HINT] = {
.type = NLA_EXACT_LEN_WARN,
.len = ETH_ALEN
},
[NL80211_ATTR_MAC_HINT] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_ATTR_WIPHY_FREQ_HINT] = { .type = NLA_U32 },
[NL80211_ATTR_TDLS_PEER_CAPABILITY] = { .type = NLA_U32 },
[NL80211_ATTR_SOCKET_OWNER] = { .type = NLA_FLAG },
Expand All @@ -589,10 +574,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_ADMITTED_TIME] = { .type = NLA_U16 },
[NL80211_ATTR_SMPS_MODE] = { .type = NLA_U8 },
[NL80211_ATTR_OPER_CLASS] = { .type = NLA_U8 },
[NL80211_ATTR_MAC_MASK] = {
.type = NLA_EXACT_LEN_WARN,
.len = ETH_ALEN
},
[NL80211_ATTR_MAC_MASK] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_ATTR_WIPHY_SELF_MANAGED_REG] = { .type = NLA_FLAG },
[NL80211_ATTR_NETNS_FD] = { .type = NLA_U32 },
[NL80211_ATTR_SCHED_SCAN_DELAY] = { .type = NLA_U32 },
Expand All @@ -604,21 +586,15 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_MU_MIMO_GROUP_DATA] = {
.len = VHT_MUMIMO_GROUPS_DATA_LEN
},
[NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR] = {
.type = NLA_EXACT_LEN_WARN,
.len = ETH_ALEN
},
[NL80211_ATTR_MU_MIMO_FOLLOW_MAC_ADDR] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_ATTR_NAN_MASTER_PREF] = NLA_POLICY_MIN(NLA_U8, 1),
[NL80211_ATTR_BANDS] = { .type = NLA_U32 },
[NL80211_ATTR_NAN_FUNC] = { .type = NLA_NESTED },
[NL80211_ATTR_FILS_KEK] = { .type = NLA_BINARY,
.len = FILS_MAX_KEK_LEN },
[NL80211_ATTR_FILS_NONCES] = {
.type = NLA_EXACT_LEN_WARN,
.len = 2 * FILS_NONCE_LEN
},
[NL80211_ATTR_FILS_NONCES] = NLA_POLICY_EXACT_LEN_WARN(2 * FILS_NONCE_LEN),
[NL80211_ATTR_MULTICAST_TO_UNICAST_ENABLED] = { .type = NLA_FLAG, },
[NL80211_ATTR_BSSID] = { .type = NLA_EXACT_LEN_WARN, .len = ETH_ALEN },
[NL80211_ATTR_BSSID] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_ATTR_SCHED_SCAN_RELATIVE_RSSI] = { .type = NLA_S8 },
[NL80211_ATTR_SCHED_SCAN_RSSI_ADJUST] = {
.len = sizeof(struct nl80211_bss_select_rssi_adjust)
Expand All @@ -631,7 +607,7 @@ static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
[NL80211_ATTR_FILS_ERP_NEXT_SEQ_NUM] = { .type = NLA_U16 },
[NL80211_ATTR_FILS_ERP_RRK] = { .type = NLA_BINARY,
.len = FILS_ERP_MAX_RRK_LEN },
[NL80211_ATTR_FILS_CACHE_ID] = { .type = NLA_EXACT_LEN_WARN, .len = 2 },
[NL80211_ATTR_FILS_CACHE_ID] = NLA_POLICY_EXACT_LEN_WARN(2),
[NL80211_ATTR_PMK] = { .type = NLA_BINARY, .len = PMK_MAX_LEN },
[NL80211_ATTR_SCHED_SCAN_MULTI] = { .type = NLA_FLAG },
[NL80211_ATTR_EXTERNAL_AUTH_SUPPORT] = { .type = NLA_FLAG },
Expand Down Expand Up @@ -701,10 +677,7 @@ static const struct nla_policy
nl80211_wowlan_tcp_policy[NUM_NL80211_WOWLAN_TCP] = {
[NL80211_WOWLAN_TCP_SRC_IPV4] = { .type = NLA_U32 },
[NL80211_WOWLAN_TCP_DST_IPV4] = { .type = NLA_U32 },
[NL80211_WOWLAN_TCP_DST_MAC] = {
.type = NLA_EXACT_LEN_WARN,
.len = ETH_ALEN
},
[NL80211_WOWLAN_TCP_DST_MAC] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_WOWLAN_TCP_SRC_PORT] = { .type = NLA_U16 },
[NL80211_WOWLAN_TCP_DST_PORT] = { .type = NLA_U16 },
[NL80211_WOWLAN_TCP_DATA_PAYLOAD] = { .type = NLA_MIN_LEN, .len = 1 },
Expand Down Expand Up @@ -734,18 +707,9 @@ nl80211_coalesce_policy[NUM_NL80211_ATTR_COALESCE_RULE] = {
/* policy for GTK rekey offload attributes */
static const struct nla_policy
nl80211_rekey_policy[NUM_NL80211_REKEY_DATA] = {
[NL80211_REKEY_DATA_KEK] = {
.type = NLA_EXACT_LEN_WARN,
.len = NL80211_KEK_LEN,
},
[NL80211_REKEY_DATA_KCK] = {
.type = NLA_EXACT_LEN_WARN,
.len = NL80211_KCK_LEN,
},
[NL80211_REKEY_DATA_REPLAY_CTR] = {
.type = NLA_EXACT_LEN_WARN,
.len = NL80211_REPLAY_CTR_LEN
},
[NL80211_REKEY_DATA_KEK] = NLA_POLICY_EXACT_LEN_WARN(NL80211_KEK_LEN),
[NL80211_REKEY_DATA_KCK] = NLA_POLICY_EXACT_LEN_WARN(NL80211_KCK_LEN),
[NL80211_REKEY_DATA_REPLAY_CTR] = NLA_POLICY_EXACT_LEN_WARN(NL80211_REPLAY_CTR_LEN),
};

static const struct nla_policy
Expand All @@ -760,10 +724,7 @@ static const struct nla_policy
nl80211_match_policy[NL80211_SCHED_SCAN_MATCH_ATTR_MAX + 1] = {
[NL80211_SCHED_SCAN_MATCH_ATTR_SSID] = { .type = NLA_BINARY,
.len = IEEE80211_MAX_SSID_LEN },
[NL80211_SCHED_SCAN_MATCH_ATTR_BSSID] = {
.type = NLA_EXACT_LEN_WARN,
.len = ETH_ALEN
},
[NL80211_SCHED_SCAN_MATCH_ATTR_BSSID] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_SCHED_SCAN_MATCH_ATTR_RSSI] = { .type = NLA_U32 },
[NL80211_SCHED_SCAN_MATCH_PER_BAND_RSSI] =
NLA_POLICY_NESTED(nl80211_match_band_rssi_policy),
Expand Down Expand Up @@ -795,10 +756,7 @@ nl80211_nan_func_policy[NL80211_NAN_FUNC_ATTR_MAX + 1] = {
[NL80211_NAN_FUNC_SUBSCRIBE_ACTIVE] = { .type = NLA_FLAG },
[NL80211_NAN_FUNC_FOLLOW_UP_ID] = { .type = NLA_U8 },
[NL80211_NAN_FUNC_FOLLOW_UP_REQ_ID] = { .type = NLA_U8 },
[NL80211_NAN_FUNC_FOLLOW_UP_DEST] = {
.type = NLA_EXACT_LEN_WARN,
.len = ETH_ALEN
},
[NL80211_NAN_FUNC_FOLLOW_UP_DEST] = NLA_POLICY_EXACT_LEN_WARN(ETH_ALEN),
[NL80211_NAN_FUNC_CLOSE_RANGE] = { .type = NLA_FLAG },
[NL80211_NAN_FUNC_TTL] = { .type = NLA_U32 },
[NL80211_NAN_FUNC_SERVICE_INFO] = { .type = NLA_BINARY,
Expand Down Expand Up @@ -4404,10 +4362,7 @@ static const struct nla_policy nl80211_txattr_policy[NL80211_TXRATE_MAX + 1] = {
.len = NL80211_MAX_SUPP_RATES },
[NL80211_TXRATE_HT] = { .type = NLA_BINARY,
.len = NL80211_MAX_SUPP_HT_RATES },
[NL80211_TXRATE_VHT] = {
.type = NLA_EXACT_LEN_WARN,
.len = sizeof(struct nl80211_txrate_vht),
},
[NL80211_TXRATE_VHT] = NLA_POLICY_EXACT_LEN_WARN(sizeof(struct nl80211_txrate_vht)),
[NL80211_TXRATE_GI] = { .type = NLA_U8 },
};

Expand Down

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