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ie: Add initial parser for RSN Elements
As found in 802.11 Section 8.4.2.27. Currently the parser does not handle the Capabilities, Group Management Cipher Suite or PMKID related fields.
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2b7432bddb
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104
src/ie.c
104
src/ie.c
@ -318,3 +318,107 @@ static bool ie_parse_pairwise_cipher(const uint8_t *data,
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*out = tmp;
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return true;
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}
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#define RSNE_ADVANCE(data, len, step) \
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data += step; \
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len -= step; \
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\
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if (len == 0) \
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goto done \
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int ie_parse_rsne(struct ie_tlv_iter *iter, struct ie_rsn_info *out_info)
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{
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const uint8_t *data = iter->data;
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size_t len = iter->len;
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uint16_t version;
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struct ie_rsn_info info;
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uint16_t count;
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uint16_t i;
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memset(&info, 0, sizeof(info));
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info.group_cipher = IE_RSN_CIPHER_SUITE_CCMP;
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info.pairwise_ciphers = IE_RSN_CIPHER_SUITE_CCMP;
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info.akm_suites = IE_RSN_AKM_SUITE_8021X;
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/* Parse Version field */
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if (len < 2)
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return -EMSGSIZE;
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version = l_get_le16(data);
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if (version != 0x01)
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return -EBADMSG;
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RSNE_ADVANCE(data, len, 2);
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/* Parse Group Cipher Suite field */
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if (len < 4)
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return -EBADMSG;
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if (!ie_parse_group_cipher(data, &info.group_cipher))
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return -ERANGE;
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RSNE_ADVANCE(data, len, 4);
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/* Parse Pairwise Cipher Suite Count field */
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if (len < 2)
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return -EBADMSG;
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count = l_get_le16(data);
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/*
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* The spec doesn't seem to explicitly say what to do in this case,
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* so we assume this situation is invalid.
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*/
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if (count == 0)
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return -EINVAL;
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data += 2;
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len -= 2;
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if (len < 4 * count)
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return -EBADMSG;
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/* Parse Pairwise Cipher Suite List field */
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for (i = 0, info.pairwise_ciphers = 0; i < count; i++) {
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enum ie_rsn_cipher_suite suite;
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if (!ie_parse_pairwise_cipher(data + i * 4, &suite))
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return -ERANGE;
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info.pairwise_ciphers |= suite;
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}
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RSNE_ADVANCE(data, len, count * 4);
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/* Parse AKM Suite Count field */
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if (len < 2)
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return -EBADMSG;
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count = l_get_le16(data);
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if (count == 0)
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return -EINVAL;
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data += 2;
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len -= 2;
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if (len < 4 * count)
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return -EBADMSG;
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/* Parse AKM Suite List field */
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for (i = 0, info.akm_suites = 0; i < count; i++) {
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enum ie_rsn_akm_suite suite;
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if (!ie_parse_akm_suite(data + i * 4, &suite))
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return -ERANGE;
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info.akm_suites |= suite;
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}
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RSNE_ADVANCE(data, len, count * 4);
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done:
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if (out_info)
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memcpy(out_info, &info, sizeof(info));
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return 0;
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}
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25
src/ie.h
25
src/ie.h
@ -20,6 +20,9 @@
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*
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*/
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#include <stdbool.h>
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#include <stddef.h>
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/*
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* Information elements, IEEE Std 802.11 ch. 8.4.2
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*/
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@ -199,6 +202,26 @@ struct ie_tlv_builder {
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unsigned int len;
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};
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struct ie_rsn_info {
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enum ie_rsn_cipher_suite group_cipher;
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uint16_t pairwise_ciphers;
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uint16_t akm_suites;
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bool preauthentication:1;
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bool no_pairwise:1;
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uint8_t ptksa_replay_counter:2;
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uint8_t gtksa_replay_counter:2;
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bool mfpr:1;
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bool mfpc:1;
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bool peerkey_enabled:1;
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bool spp_a_msdu_capable:1;
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bool spp_a_msdu_required:1;
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bool pbac:1;
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bool extended_key_id:1;
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uint8_t num_pmkids;
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const uint8_t *pmkids;
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enum ie_rsn_cipher_suite group_management_cipher;
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};
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void ie_tlv_iter_init(struct ie_tlv_iter *iter, const unsigned char *tlv,
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unsigned int len);
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void ie_tlv_iter_recurse(struct ie_tlv_iter *iter,
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@ -214,3 +237,5 @@ bool ie_tlv_builder_recurse(struct ie_tlv_builder *builder,
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struct ie_tlv_builder *recurse);
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void ie_tlv_builder_finalize(struct ie_tlv_builder *builder,
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unsigned int *out_len);
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int ie_parse_rsne(struct ie_tlv_iter *iter, struct ie_rsn_info *info);
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