int duplicate(struct params *p, struct ieee80211_frame *wh, int rc)
{
struct client *c;
int s;
if (!frame_type(wh, IEEE80211_FC0_TYPE_DATA,
IEEE80211_FC0_SUBTYPE_DATA))
return 0;
s = seqno(wh);
c = client_find(p, wh->i_addr2);
if (!c) {
c = malloc(sizeof(*c));
if (!c)
err(1, "malloc()");
memset(c, 0, sizeof(*c));
memcpy(c->mac, wh->i_addr2, 6);
c->seq = s-1;
client_insert(p, c);
}
if (wh->i_fc[1] & IEEE80211_FC1_RETRY) {
if ( (s <= c->seq) && ((c->seq - s ) < 5)) {
#if 0
printf("Dup seq %d prev %d\n",
s, c->seq);
#endif
return 1;
}
}
#if 0
do {
char mac[3*6];
mac2str(mac, c->mac);
printf("%s seq %d prev %d\n", mac, s, c->seq);
} while (0);
#endif
c->seq = s;
return 0;
}
void generic_process(struct ieee80211_frame *wh, struct params *p, int len)
{
int type, stype;
int dup = 0;
#if 0
ack(p, wh);
#endif
#if 0
if (!for_me(wh, p->mac))
return;
#endif
/* ignore my own shit */
if (memcmp(wh->i_addr2, p->mac, 6) == 0) {
return;
}
type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
stype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
if (for_me(wh, p->mac) && type == IEEE80211_FC0_TYPE_DATA) {
/* sequence number & dups */
if (p->seq_rx == -1)
p->seq_rx = seqno(wh);
else {
int s = seqno(wh);
if (s > p->seq_rx) {
/* normal case */
if (p->seq_rx + 1 == s) {
#if 0
printf("S=%d\n", s);
#endif
p->seq_rx = s;
}
else { /* future */
#if 0
printf("Got seq %d, prev %d\n",
s, p->seq_rx);
#endif
p->seq_rx = s;
}
} else { /* we got pas stuff... */
if (p->seq_rx - s > 1000) {
#if 0
printf("Seqno wrap seq %d, last %d\n",
s, p->seq_rx);
#endif
/* seqno wrapping ? */
p->seq_rx = 0;
}
else { /* dup */
dup = 1;
#if 0
printf("Got dup seq %d, last %d\n",
s, p->seq_rx);
#endif
}
}
}
}
#if 0
if (wh->i_fc[1] & IEEE80211_FC1_RETRY) {
printf("Got retry\n");
}
#endif
#if 0
if ((wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) != IEEE80211_FC0_TYPE_CTL) {
int rc = send_ack(p->tx, wh->i_addr2);
if (rc == -1)
err(1, "send_ack()");
if (rc != 10) {
printf("Wrote ACK %d/%d\n", rc, 10);
exit(1);
}
}
#endif
/* data frames */
if (type == IEEE80211_FC0_TYPE_DATA && !dup) {
char *ptr;
char src[6], dst[6];
int rc;
if (wh->i_fc[1] & IEEE80211_FC1_DIR_FROMDS) {
if (memcmp(wh->i_addr2, p->ap, 6) != 0)
return;
} else {
if (memcmp(wh->i_addr1, p->ap, 6) != 0)
return;
}
if (p->state < S_ASSOCIATED) {
printf("Got data when not associated!\n");
return;
}
if (stype != IEEE80211_FC0_SUBTYPE_DATA) {
printf("Got weird data frame stype=%d\n",
stype >> IEEE80211_FC0_SUBTYPE_SHIFT);
return;
}
