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From 99b82bf53792d48b5d0c3f9edcccc6e53c9510fe Mon Sep 17 00:00:00 2001
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Message-Id: <99b82bf53792d48b5d0c3f9edcccc6e53c9510fe.1488376601.git.dcaratti@redhat.com>
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From: Sabrina Dubroca <sd@queasysnail.net>
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Date: Fri, 21 Oct 2016 14:45:29 +0200
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Subject: [PATCH] mka: Implement reference counting on data_key
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struct data_key already had a 'user' field for reference counting, but
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it was basically unused.
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Add an ieee802_1x_kay_use_data_key() function to take a reference on a
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key, and use ieee802_1x_kay_deinit_data_key() to release the reference.
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Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
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---
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src/pae/ieee802_1x_kay.c | 28 ++++++++++++++++++++++++----
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src/pae/ieee802_1x_kay.h | 2 +-
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2 files changed, 25 insertions(+), 5 deletions(-)
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diff --git a/src/pae/ieee802_1x_kay.c b/src/pae/ieee802_1x_kay.c
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index e312d04..63bbd13 100644
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--- a/src/pae/ieee802_1x_kay.c
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+++ b/src/pae/ieee802_1x_kay.c
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@@ -411,6 +411,8 @@ ieee802_1x_kay_get_peer_sci(struct ieee802_1x_mka_participant *participant,
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}
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+static void ieee802_1x_kay_use_data_key(struct data_key *pkey);
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+
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/**
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* ieee802_1x_kay_init_receive_sa -
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*/
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@@ -429,6 +431,7 @@ ieee802_1x_kay_init_receive_sa(struct receive_sc *psc, u8 an, u32 lowest_pn,
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return NULL;
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}
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+ ieee802_1x_kay_use_data_key(key);
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psa->pkey = key;
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psa->lowest_pn = lowest_pn;
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psa->next_pn = lowest_pn;
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@@ -447,11 +450,14 @@ ieee802_1x_kay_init_receive_sa(struct receive_sc *psc, u8 an, u32 lowest_pn,
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}
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+static void ieee802_1x_kay_deinit_data_key(struct data_key *pkey);
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+
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/**
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* ieee802_1x_kay_deinit_receive_sa -
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*/
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static void ieee802_1x_kay_deinit_receive_sa(struct receive_sa *psa)
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{
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+ ieee802_1x_kay_deinit_data_key(psa->pkey);
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psa->pkey = NULL;
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wpa_printf(MSG_DEBUG,
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"KaY: Delete receive SA(an: %hhu) of SC",
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@@ -1612,6 +1618,7 @@ ieee802_1x_mka_decode_dist_sak_body(
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sa_key->an = body->dan;
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ieee802_1x_kay_init_data_key(sa_key);
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+ ieee802_1x_kay_use_data_key(sa_key);
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dl_list_add(&participant->sak_list, &sa_key->list);
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ieee802_1x_cp_set_ciphersuite(kay->cp, cs->id);
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@@ -1873,7 +1880,17 @@ static struct mka_param_body_handler mka_body_handler[] = {
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/**
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- * ieee802_1x_kay_deinit_data_key -
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+ * ieee802_1x_kay_use_data_key - Take reference on a key
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+ */
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+static void ieee802_1x_kay_use_data_key(struct data_key *pkey)
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+{
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+ pkey->user++;
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+}
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+
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+
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+/**
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+ * ieee802_1x_kay_deinit_data_key - Release reference on a key and
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+ * free if there are no remaining users
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*/
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static void ieee802_1x_kay_deinit_data_key(struct data_key *pkey)
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{
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@@ -1884,7 +1901,6 @@ static void ieee802_1x_kay_deinit_data_key(struct data_key *pkey)
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if (pkey->user > 1)
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return;
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- dl_list_del(&pkey->list);
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os_free(pkey->key);
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os_free(pkey);
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}
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@@ -1994,7 +2010,9 @@ ieee802_1x_kay_generate_new_sak(struct ieee802_1x_mka_participant *participant)
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participant->new_key = sa_key;
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+ ieee802_1x_kay_use_data_key(sa_key);
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dl_list_add(&participant->sak_list, &sa_key->list);
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+
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ieee802_1x_cp_set_ciphersuite(kay->cp, cs->id);
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ieee802_1x_cp_sm_step(kay->cp);
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ieee802_1x_cp_set_offset(kay->cp, kay->macsec_confidentiality);
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@@ -2436,6 +2454,7 @@ ieee802_1x_kay_init_transmit_sa(struct transmit_sc *psc, u8 an, u32 next_PN,
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psa->confidentiality = FALSE;
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psa->an = an;
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+ ieee802_1x_kay_use_data_key(key);
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psa->pkey = key;
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psa->next_pn = next_PN;
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psa->sc = psc;
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@@ -2457,6 +2476,7 @@ ieee802_1x_kay_init_transmit_sa(struct transmit_sc *psc, u8 an, u32 next_PN,
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*/
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static void ieee802_1x_kay_deinit_transmit_sa(struct transmit_sa *psa)
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{
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+ ieee802_1x_kay_deinit_data_key(psa->pkey);
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psa->pkey = NULL;
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wpa_printf(MSG_DEBUG,
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"KaY: Delete transmit SA(an: %hhu) of SC",
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@@ -2708,6 +2728,7 @@ int ieee802_1x_kay_delete_sas(struct ieee802_1x_kay *kay,
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dl_list_for_each_safe(sa_key, pre_key, &principal->sak_list,
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struct data_key, list) {
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if (is_ki_equal(&sa_key->key_identifier, ki)) {
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+ dl_list_del(&sa_key->list);
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ieee802_1x_kay_deinit_data_key(sa_key);
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break;
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}
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@@ -3375,8 +3396,7 @@ ieee802_1x_kay_delete_mka(struct ieee802_1x_kay *kay, struct mka_key_name *ckn)
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sak = dl_list_entry(participant->sak_list.next,
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struct data_key, list);
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dl_list_del(&sak->list);
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- os_free(sak->key);
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- os_free(sak);
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+ ieee802_1x_kay_deinit_data_key(sak);
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}
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while (!dl_list_empty(&participant->rxsc_list)) {
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rxsc = dl_list_entry(participant->rxsc_list.next,
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diff --git a/src/pae/ieee802_1x_kay.h b/src/pae/ieee802_1x_kay.h
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index 5233cb2..576a8a0 100644
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--- a/src/pae/ieee802_1x_kay.h
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+++ b/src/pae/ieee802_1x_kay.h
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@@ -70,7 +70,7 @@ struct data_key {
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Boolean rx_latest;
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Boolean tx_latest;
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- int user; /* FIXME: to indicate if it can be delete safely */
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+ int user;
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struct dl_list list;
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};
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--
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2.7.4
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