1: #include "global.h"
2: #include "dwds.h"
3:
4:
5: static inline int
6: wifi_getParent(const char *csVAP, char *psParent, size_t plen)
7: {
8: char szOID[STRSIZ] = { 0 };
9:
10: FTRACE(5);
11:
12: assert(csVAP);
13: assert(psParent);
14:
15: memset(psParent, 0, plen);
16: snprintf(szOID, STRSIZ, "net.wlan.%s.%%parent", csVAP + 4);
17: if (sysctlbyname(szOID, psParent, &plen, NULL, 0) == -1) {
18: // syslog(LOG_ERR, "Error:: can`t get parent #%d - %s\n", errno, strerror(errno));
19: return -1;
20: } else
21: psParent[plen] = 0;
22:
23: return 0;
24: }
25:
26: inline int
27: wifi_chkIface(const char *csVAP, char **ppsIF, int nIF)
28: {
29: char szParent[IFNAMSIZ];
30: register int i;
31:
32: FTRACE(5);
33:
34: assert(csVAP);
35:
36: if (wifi_getParent(csVAP, szParent, IFNAMSIZ) == -1)
37: return -1;
38:
39: for (i = 0; i < nIF; i++)
40: if (!strcasecmp(ppsIF[i], "any") || !strcmp(ppsIF[i], szParent))
41: return 1; /* OK, vap is child */
42:
43: syslog(LOG_ERR, "Error:: Interface %s parent %s not being monitored", csVAP, szParent);
44: return 0;
45: }
46:
47: static inline int
48: wifi_isWDS(int fd, const char *csVAP)
49: {
50: struct ifmediareq ifmr;
51:
52: FTRACE(5);
53:
54: assert(csVAP);
55:
56: memset(&ifmr, 0, sizeof ifmr);
57: strlcpy(ifmr.ifm_name, csVAP, sizeof ifmr.ifm_name);
58: if (ioctl(fd, SIOCGIFMEDIA, &ifmr) == -1) {
59: syslog(LOG_ERR, "Error:: can`t get media for %s #%d - %s\n", csVAP,
60: errno, strerror(errno));
61: return -1;
62: }
63:
64: return (ifmr.ifm_current & IFM_IEEE80211_WDS) != 0;
65: }
66:
67: static inline int
68: wifi_getBSSID(int fd, const char *csVAP, uint8_t *psBSSID, int len)
69: {
70: struct ieee80211req ireq;
71:
72: FTRACE(5);
73:
74: assert(csVAP);
75: assert(psBSSID);
76:
77: memset(&ireq, 0, sizeof ireq);
78: strlcpy(ireq.i_name, csVAP, sizeof ireq.i_name);
79: ireq.i_type = IEEE80211_IOC_BSSID;
80: ireq.i_data = psBSSID;
81: ireq.i_len = len;
82: if (ioctl(fd, SIOCG80211, &ireq) == -1) {
83: syslog(LOG_ERR, "Error:: can`t get BSSID for %s #%d - %s\n", csVAP,
84: errno, strerror(errno));
85: return -1;
86: }
87:
88: return 0;
89: }
90:
91: struct dwds_if *
92: wifi_buildWDS(int fd, char **ppsIF, int nIF)
93: {
94: struct dwds_if *p, *wds = NULL;
95: char szVAP[IFNAMSIZ];
96: struct ether_addr bssid;
97: register int i;
98:
99: for (i = 0; i < 128; i++) {
100: memset(szVAP, 0, IFNAMSIZ);
101: snprintf(szVAP, IFNAMSIZ, "wlan%d", i);
102: if (wifi_chkIface(szVAP, ppsIF, nIF) > 0 && wifi_isWDS(fd, szVAP) > 0) {
103: p = malloc(sizeof(struct dwds_if));
104: if (!p) {
105: syslog(LOG_ERR, "Error:: can`t allocate memory #%d - %s\n",
106: errno, strerror(errno));
107: i = -1;
108: break;
109: }
110: strlcpy(p->if_name, szVAP, IFNAMSIZ);
111: if (wifi_getBSSID(fd, szVAP, p->if_bssid, IEEE80211_ADDR_LEN) == -1) {
112: free(p);
113: i = -1;
114: break;
115: }
116: p->if_next = wds;
117: wds = p;
118:
119: memcpy(&bssid, p->if_bssid, ETHER_ADDR_LEN);
120: syslog(LOG_INFO, "BSSID:%s discover WDS vap %s\n", ether_ntoa(&bssid), szVAP);
121: }
122: }
123:
124: if (i == -1)
125: while ((p = wds)) {
126: wds = wds->if_next;
127: free(p);
128: }
129:
130: return wds;
131: }
132:
133: inline int
134: wifi_destroyWDS(const char *csIface, struct dwds_if **wds)
135: {
136: struct dwds_if *p, **pp;
137:
138: assert(csIface);
139: assert(wds);
140:
141: for (pp = wds; (p = *pp); pp = &p->if_next)
142: if (!strncmp(p->if_name, csIface, IFNAMSIZ))
143: break;
144: if (p) {
145: *pp = p->if_next;
146: free(p);
147: return 0;
148: }
149:
150: return 1;
151: }
152:
153: static int
154: wifi_vapDestroy(const char *csVAP)
155: {
156: struct ieee80211req ifr;
157: int s;
158:
159: assert(csVAP);
160:
161: s = socket(PF_INET, SOCK_DGRAM, 0);
162: if (s == -1) {
163: syslog(LOG_ERR, "Error:: destroy socket(vap) %m\n");
164: return -1;
165: }
166:
167: memset(&ifr, 0, sizeof ifr);
168: strlcpy(ifr.i_name, csVAP, IFNAMSIZ);
169: if (ioctl(s, SIOCIFDESTROY, &ifr) == -1) {
170: syslog(LOG_ERR, "Error:: destroy ioctl(vap) %m\n");
171: close(s);
172: return -1;
173: } else
174: close(s);
175:
176: return 0;
177: }
178:
179: inline int
180: wifi_leaveWDS(struct ether_addr bssid, struct dwds_if **wds)
181: {
182: struct dwds_if *p, **pp;
183:
184: assert(wds);
185:
186: for (pp = wds; (p = *pp); pp = &p->if_next)
187: if (!memcmp(p->if_bssid, &bssid, IEEE80211_ADDR_LEN))
188: break;
189: if (p) {
190: *pp = p->if_next;
191: if (wifi_vapDestroy(p->if_name) != -1)
192: VERB(1) syslog(LOG_INFO, "BSSID:%s WDS VAP %s destroyed\n",
193: ether_ntoa(&bssid), p->if_name);
194: free(p);
195: return 0;
196: }
197:
198: return 1;
199: }
200:
201: static int
202: wifi_vapCreate(const char *csIface, struct dwds_if *p)
203: {
204: struct ieee80211_clone_params cp;
205: struct ifreq ifr;
206: struct ether_addr bssid;
207: int s;
208:
209: assert(csIface);
210: assert(p);
211:
212: s = socket(PF_INET, SOCK_DGRAM, 0);
213: if (s == -1) {
214: syslog(LOG_ERR, "Error:: create socket(vap) %m\n");
215: return -1;
216: }
217:
218: memset(&cp, 0, sizeof cp);
219: strlcpy(cp.icp_parent, csIface, IFNAMSIZ);
220: cp.icp_opmode = IEEE80211_M_WDS;
221: memcpy(cp.icp_bssid, p->if_bssid, IEEE80211_ADDR_LEN);
222:
223: memset(&ifr, 0, sizeof ifr);
224: strlcpy(ifr.ifr_name, "wlan", IFNAMSIZ);
225: ifr.ifr_data = (void *) &cp;
226:
227: if (ioctl(s, SIOCIFCREATE2, &ifr) == -1) {
228: memcpy(&bssid, cp.icp_bssid, IEEE80211_ADDR_LEN);
229: syslog(LOG_ERR, "Error:: create ioctl(vap) mode %u flags 0x%x parent %s bssid %s %m\n",
230: cp.icp_opmode, cp.icp_flags, cp.icp_parent, ether_ntoa(&bssid));
231: close(s);
232: return -1;
233: } else {
234: strlcpy(p->if_name, ifr.ifr_name, IFNAMSIZ);
235: close(s);
236: }
237:
238: return 0;
239: }
240:
241: inline int
242: wifi_createWDS(const char *csIface, struct ether_addr bssid, struct dwds_if **wds)
243: {
244: struct dwds_if *p;
245: char szParent[IFNAMSIZ];
246:
247: assert(csIface);
248: assert(wds);
249:
250: for (p = *wds; p; p = p->if_next)
251: if (!memcmp(p->if_bssid, &bssid, IEEE80211_ADDR_LEN)) {
252: VERB(1) syslog(LOG_INFO, "BSSID:%s WDS VAP already created (%s)\n",
253: ether_ntoa(&bssid), csIface);
254: return 1;
255: }
256: if (wifi_getParent(csIface, szParent, IFNAMSIZ) == -1) {
257: syslog(LOG_ERR, "Error:: %s no pointer to parent interface\n", csIface);
258: return -1;
259: }
260:
261: p = malloc(sizeof(struct dwds_if));
262: if (!p) {
263: syslog(LOG_ERR, "Error:: malloc failed: %m\n");
264: return -1;
265: } else
266: memcpy(p->if_bssid, &bssid, IEEE80211_ADDR_LEN);
267: if (wifi_vapCreate(csIface, p) == -1) {
268: free(p);
269: return -1;
270: } else {
271: p->if_next = *wds;
272: *wds = p;
273: VERB(1) syslog(LOG_INFO, "BSSID:%s create WDS VAP %s\n", ether_ntoa(&bssid), p->if_name);
274: }
275:
276: return 0;
277: }
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