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https://git.kernel.org/pub/scm/network/wireless/iwd.git
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wiphy: add _generate_address_from_ssid
This API is being added to support per-network MAC address generation. The MAC is generated based on the network SSID and the adapters permanent address using HMAC-SHA256. The SHA digest is then constrained to make it MAC address compliant. Generating the MAC address like this will ensure that the MAC remains the same each time a given SSID is connected to.
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parent
60bb42087a
commit
1f14782857
34
src/wiphy.c
34
src/wiphy.c
@ -435,12 +435,10 @@ const uint8_t *wiphy_get_rm_enabled_capabilities(struct wiphy *wiphy)
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return wiphy->rm_enabled_capabilities;
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}
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void wiphy_generate_random_address(struct wiphy *wiphy, uint8_t addr[static 6])
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static void wiphy_address_constrain(struct wiphy *wiphy, uint8_t addr[static 6])
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{
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switch (mac_randomize_bytes) {
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case 6:
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l_getrandom(addr, 6);
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/* Set the locally administered bit */
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addr[0] |= 0x2;
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@ -448,7 +446,6 @@ void wiphy_generate_random_address(struct wiphy *wiphy, uint8_t addr[static 6])
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addr[0] &= 0xfe;
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break;
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case 3:
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l_getrandom(addr + 3, 3);
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memcpy(addr, wiphy->permanent_addr, 3);
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break;
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}
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@ -464,6 +461,35 @@ void wiphy_generate_random_address(struct wiphy *wiphy, uint8_t addr[static 6])
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addr[5] = 0x01;
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}
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void wiphy_generate_random_address(struct wiphy *wiphy, uint8_t addr[static 6])
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{
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switch (mac_randomize_bytes) {
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case 6:
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l_getrandom(addr, 6);
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break;
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case 3:
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l_getrandom(addr + 3, 3);
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break;
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}
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wiphy_address_constrain(wiphy, addr);
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}
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void wiphy_generate_address_from_ssid(struct wiphy *wiphy, const char *ssid,
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uint8_t addr[static 6])
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{
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struct l_checksum *sha = l_checksum_new(L_CHECKSUM_SHA256);
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l_checksum_update(sha, ssid, strlen(ssid));
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l_checksum_update(sha, wiphy->permanent_addr,
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sizeof(wiphy->permanent_addr));
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l_checksum_get_digest(sha, addr, mac_randomize_bytes);
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l_checksum_free(sha);
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wiphy_address_constrain(wiphy, addr);
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}
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bool wiphy_constrain_freq_set(const struct wiphy *wiphy,
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struct scan_freq_set *set)
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{
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@ -82,6 +82,8 @@ const uint8_t *wiphy_get_extended_capabilities(struct wiphy *wiphy,
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const uint8_t *wiphy_get_rm_enabled_capabilities(struct wiphy *wiphy);
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void wiphy_generate_random_address(struct wiphy *wiphy, uint8_t addr[static 6]);
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void wiphy_generate_address_from_ssid(struct wiphy *wiphy, const char *ssid,
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uint8_t addr[static 6]);
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uint32_t wiphy_state_watch_add(struct wiphy *wiphy,
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wiphy_state_watch_func_t func, void *user_data,
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