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eap-wsc: Add TX fragmentation support

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This commit is contained in:
Tim Kourt 2016-11-03 14:47:16 -07:00 committed by Denis Kenzior
parent 2352c3f819
commit 2148d71264
1 changed files with 49 additions and 9 deletions
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58
src/eap-wsc.c
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@ -82,6 +82,7 @@ struct eap_wsc_state {
enum state state; enum state state;
struct l_checksum *hmac_auth_key; struct l_checksum *hmac_auth_key;
struct l_cipher *aes_cbc_128; struct l_cipher *aes_cbc_128;
size_t tx_frag_offset;
}; };
static inline void eap_wsc_state_set_sent_pdu(struct eap_wsc_state *wsc, static inline void eap_wsc_state_set_sent_pdu(struct eap_wsc_state *wsc,
@ -287,7 +288,7 @@ static void eap_wsc_remove(struct eap_state *eap)
l_key_free(wsc->private); l_key_free(wsc->private);
l_free(wsc->sent_pdu); l_free(wsc->sent_pdu);
wsc->sent_pdu = 0; wsc->sent_pdu = NULL;
wsc->sent_len = 0; wsc->sent_len = 0;
l_checksum_free(wsc->hmac_auth_key); l_checksum_free(wsc->hmac_auth_key);
@ -299,19 +300,57 @@ static void eap_wsc_remove(struct eap_state *eap)
l_free(wsc); l_free(wsc);
} }
static void eap_wsc_send_response(struct eap_state *eap, static void eap_wsc_send_fragment(struct eap_state *eap)
uint8_t *pdu, size_t len)
{ {
struct eap_wsc_state *wsc = eap_get_data(eap); struct eap_wsc_state *wsc = eap_get_data(eap);
uint8_t buf[len + 14]; size_t mtu = eap_get_mtu(eap);
uint8_t buf[mtu];
size_t len = wsc->sent_len - wsc->tx_frag_offset;
size_t header_len = EAP_WSC_HEADER_LEN;
buf[12] = WSC_OP_MSG; buf[12] = WSC_OP_MSG;
buf[13] = 0;
memcpy(buf + 14, pdu, len);
eap_send_response(eap, EAP_TYPE_EXPANDED, buf, len + 14); if (len > mtu - EAP_WSC_HEADER_LEN) {
len = mtu - EAP_WSC_HEADER_LEN;
buf[13] = WSC_FLAG_MF;
} else {
buf[13] = 0;
}
eap_wsc_state_set_sent_pdu(wsc, pdu, len); if (!wsc->tx_frag_offset) {
buf[13] |= WSC_FLAG_LF;
l_put_be16(wsc->sent_len, &buf[14]);
len -= 2;
header_len += 2;
}
memcpy(buf + header_len, wsc->sent_pdu + wsc->tx_frag_offset, len);
eap_send_response(eap, EAP_TYPE_EXPANDED, buf, header_len + len);
wsc->tx_frag_offset += len;
}
static void eap_wsc_send_response(struct eap_state *eap,
uint8_t *pdu, size_t pdu_len)
{
struct eap_wsc_state *wsc = eap_get_data(eap);
size_t msg_len = pdu_len + EAP_WSC_HEADER_LEN;
eap_wsc_state_set_sent_pdu(wsc, pdu, pdu_len);
if (msg_len <= eap_get_mtu(eap)) {
uint8_t buf[msg_len];
buf[12] = WSC_OP_MSG;
buf[13] = 0;
memcpy(buf + EAP_WSC_HEADER_LEN, pdu, pdu_len);
eap_send_response(eap, EAP_TYPE_EXPANDED, buf, msg_len);
return;
}
wsc->tx_frag_offset = 0;
eap_wsc_send_fragment(eap);
} }
static void eap_wsc_send_nack(struct eap_state *eap, static void eap_wsc_send_nack(struct eap_state *eap,
@ -873,7 +912,8 @@ static void eap_wsc_handle_request(struct eap_state *eap,
/* Should never receive these as Enrollee */ /* Should never receive these as Enrollee */
return; return;
case WSC_OP_FRAG_ACK: case WSC_OP_FRAG_ACK:
/* TODO: Handle fragmentation */ if (wsc->tx_frag_offset && wsc->tx_frag_offset < wsc->sent_len)
eap_wsc_send_fragment(eap);
return; return;
case WSC_OP_MSG: case WSC_OP_MSG:
break; break;