usr.sbin/ppp/async.c

33 __FBSDID("$FreeBSD: stable/11/usr.sbin/ppp/async.c 330449 2018-03-05 07:26:05Z eadler $");
50 #include "async.h"
61 async_Init(struct async *async)
63   async_Setup(async);
64   memset(async->cfg.EscMap, '\0', sizeof async->cfg.EscMap);
68 async_Setup(struct async *async)
70   async->mode = MODE_HUNT;
71   async->length = 0;
72   async->my_accmap = async->his_accmap = 0xffffffff;
76 async_SetLinkParams(struct async *async, u_int32_t mymap, u_int32_t hismap)
78   async->my_accmap = mymap;
79   async->his_accmap = hismap | mymap;
83  * Encode into async HDLC byte code
86 async_Encode(struct async *async, u_char **cp, u_char c, int proto)
91   if ((c < 0x20 && (proto == PROTO_LCP || (async->his_accmap & (1 << c))))
96   if (async->cfg.EscMap[32] && async->cfg.EscMap[c >> 3] & (1 << (c & 7))) {
121   cp = p->async.xbuff;
128       async_Encode(&p->async, &cp, *sp++, *proto);
138   cnt = cp - p->async.xbuff;
141   memcpy(MBUF_CTOP(bp), p->async.xbuff, cnt);
149 async_Decode(struct async *async, u_char c)
153   if ((async->mode & MODE_HUNT) && c != HDLC_SYN)
158     async->mode &= ~MODE_HUNT;
159     if (async->length) {		/* packet is ready. */
160       bp = m_get(async->length, MB_ASYNCIN);
161       mbuf_Write(bp, async->hbuff, async->length);
162       async->length = 0;
167     if (!(async->mode & MODE_ESC)) {
168       async->mode |= MODE_ESC;
173     if (async->length >= HDLCSIZE) {
176                  async->length);
177       async->length = 0;
178       async->mode = MODE_HUNT;
181     if (async->mode & MODE_ESC) {
183       async->mode &= ~MODE_ESC;
185     async->hbuff[async->length++] = c;
201     log_Printf(LogERROR, "Can't Pull an async packet from a logical link\n");
211       *last = async_Decode(&p->async, *ch++);
222   { LAYER_ASYNC, "async", async_LayerPush, async_LayerPull };