diff --git a/src/p2p/p2p_go_neg.c b/src/p2p/p2p_go_neg.c index 4752b2947..ab2251113 100644 --- a/src/p2p/p2p_go_neg.c +++ b/src/p2p/p2p_go_neg.c @@ -545,6 +545,195 @@ int p2p_go_select_channel(struct p2p_data *p2p, struct p2p_device *dev, } +static void p2p_check_pref_chan_no_recv(struct p2p_data *p2p, int go, + struct p2p_device *dev, + struct p2p_message *msg, + unsigned freq_list[], unsigned int size) +{ + u8 op_class, op_channel; + unsigned int oper_freq, i, j; + int found = 0; + + p2p_dbg(p2p, + "Peer didn't provide a preferred frequency list, see if any of our preferred channels are supported by peer device"); + + /* + * Search for a common channel in our preferred frequency list which is + * also supported by the peer device. + */ + for (i = 0; i < size && !found; i++) { + /* + * Make sure that the common frequency is: + * 1. Supported by peer + * 2. Allowed for P2P use. + */ + oper_freq = freq_list[i]; + if (p2p_freq_to_channel(oper_freq, &op_class, + &op_channel) < 0) { + p2p_dbg(p2p, "Unsupported frequency %u MHz", oper_freq); + continue; + } + if (!p2p_channels_includes(&p2p->cfg->channels, + op_class, op_channel) && + (go || !p2p_channels_includes(&p2p->cfg->cli_channels, + op_class, op_channel))) { + p2p_dbg(p2p, + "Freq %u MHz (oper_class %u channel %u) not allowed for P2P", + oper_freq, op_class, op_channel); + break; + } + for (j = 0; j < msg->channel_list_len; j++) { + + if (op_channel != msg->channel_list[j]) + continue; + + p2p->op_reg_class = op_class; + p2p->op_channel = op_channel; + os_memcpy(&p2p->channels, &p2p->cfg->channels, + sizeof(struct p2p_channels)); + found = 1; + break; + } + } + + if (found) { + p2p_dbg(p2p, + "Freq %d MHz is a preferred channel and is also supported by peer, use it as the operating channel", + oper_freq); + } else { + p2p_dbg(p2p, + "None of our preferred channels are supported by peer!. Use: %d MHz for oper_channel", + dev->oper_freq); + } +} + + +static void p2p_check_pref_chan_recv(struct p2p_data *p2p, int go, + struct p2p_device *dev, + struct p2p_message *msg, + unsigned freq_list[], unsigned int size) +{ + u8 op_class, op_channel; + unsigned int oper_freq, i, j; + int found = 0; + + /* + * Peer device supports a Preferred Frequency List. + * Search for a common channel in the preferred frequency lists + * of both peer and local devices. + */ + for (i = 0; i < size && !found; i++) { + for (j = 2; j < (msg->pref_freq_list_len / 2); j++) { + oper_freq = p2p_channel_to_freq( + msg->pref_freq_list[2 * j], + msg->pref_freq_list[2 * j + 1]); + if (freq_list[i] != oper_freq) + continue; + + /* + * Make sure that the found frequency is: + * 1. Supported + * 2. Allowed for P2P use. + */ + if (p2p_freq_to_channel(oper_freq, &op_class, + &op_channel) < 0) { + p2p_dbg(p2p, "Unsupported frequency %u MHz", + oper_freq); + continue; + } + + if (!p2p_channels_includes(&p2p->cfg->channels, + op_class, op_channel) && + (go || + !p2p_channels_includes(&p2p->cfg->cli_channels, + op_class, op_channel))) { + p2p_dbg(p2p, + "Freq %u MHz (oper_class %u channel %u) not allowed for P2P", + oper_freq, op_class, op_channel); + break; + } + p2p->op_reg_class = op_class; + p2p->op_channel = op_channel; + os_memcpy(&p2p->channels, &p2p->cfg->channels, + sizeof(struct p2p_channels)); + found = 1; + break; + } + } + + if (found) { + p2p_dbg(p2p, + "Freq %d MHz is a common preferred channel for both peer and local, use it as operating channel", + oper_freq); + } else { + p2p_dbg(p2p, + "No common preferred channels found! Use: %d MHz for oper_channel", + dev->oper_freq); + } +} + + +static void p2p_check_pref_chan(struct p2p_data *p2p, int go, + struct p2p_device *dev, struct p2p_message *msg) +{ + unsigned int freq_list[P2P_MAX_PREF_CHANNELS], size; + unsigned int i; + u8 op_class, op_channel; + + /* + * Use the preferred channel list from the driver only if there is no + * forced_freq, e.g., P2P_CONNECT freq=..., and no preferred operating + * channel hardcoded in the configuration file. + */ + if (!p2p->cfg->get_pref_freq_list || p2p->cfg->num_pref_chan || + (dev->flags & P2P_DEV_FORCE_FREQ) || p2p->cfg->cfg_op_channel) + return; + + /* Obtain our preferred frequency list from driver based on P2P role. */ + size = P2P_MAX_PREF_CHANNELS; + if (p2p->cfg->get_pref_freq_list(p2p->cfg->cb_ctx, go, &size, + freq_list)) + return; + + /* + * Check if peer's preference of operating channel is in + * our preferred channel list. + */ + for (i = 0; i < size; i++) { + if (freq_list[i] == (unsigned int) dev->oper_freq) + break; + } + if (i != size) { + /* Peer operating channel preference matches our preference */ + if (p2p_freq_to_channel(freq_list[i], &op_class, &op_channel) < + 0) { + p2p_dbg(p2p, + "Peer operating channel preference is unsupported frequency %u MHz", + freq_list[i]); + } else { + p2p->op_reg_class = op_class; + p2p->op_channel = op_channel; + os_memcpy(&p2p->channels, &p2p->cfg->channels, + sizeof(struct p2p_channels)); + return; + } + } + + p2p_dbg(p2p, + "Peer operating channel preference: %d MHz is not in our preferred channel list", + dev->oper_freq); + + /* + Check if peer's preferred channel list is + * _not_ included in the GO Negotiation Request. + */ + if (msg->pref_freq_list_len == 0) + p2p_check_pref_chan_no_recv(p2p, go, dev, msg, freq_list, size); + else + p2p_check_pref_chan_recv(p2p, go, dev, msg, freq_list, size); +} + + void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, const u8 *data, size_t len, int rx_freq) { @@ -802,6 +991,12 @@ void p2p_process_go_neg_req(struct p2p_data *p2p, const u8 *sa, p2p_dbg(p2p, "Peer operating channel preference: %d MHz", dev->oper_freq); + /* + * Use the driver preferred frequency list extension if + * supported. + */ + p2p_check_pref_chan(p2p, go, dev, &msg); + if (msg.config_timeout) { dev->go_timeout = msg.config_timeout[0]; dev->client_timeout = msg.config_timeout[1]; @@ -1153,6 +1348,13 @@ void p2p_process_go_neg_resp(struct p2p_data *p2p, const u8 *sa, if (go && p2p_go_select_channel(p2p, dev, &status) < 0) goto fail; + /* + * Use the driver preferred frequency list extension if local device is + * GO. + */ + if (go) + p2p_check_pref_chan(p2p, go, dev, &msg); + p2p_set_state(p2p, P2P_GO_NEG); p2p_clear_timeout(p2p);