227   int layer;  in link_PushPacket()  local
239   for (layer = l->nlayers; layer && bp; layer--)  in link_PushPacket()
240     if (l->layer[layer - 1]->push != NULL)  in link_PushPacket()
241       bp = (*l->layer[layer - 1]->push)(b, l, bp, pri, &proto);  in link_PushPacket()
255   int layer;  in link_PullPacket()  local
275   layer = 0;  in link_PullPacket()
277   while (layer || lbp[layer]) {  in link_PullPacket()
278     if (lbp[layer] == NULL) {  in link_PullPacket()
279       layer--;  in link_PullPacket()
282     bp = lbp[layer];  in link_PullPacket()
283     lbp[layer] = bp->m_nextpkt;  in link_PullPacket()
285     proto = lproto[layer];  in link_PullPacket()
287     if (l->layer[layer]->pull != NULL)  in link_PullPacket()
288       bp = (*l->layer[layer]->pull)(b, l, bp, &proto);  in link_PullPacket()
290     if (layer == l->nlayers - 1) {  in link_PullPacket()
300       lbp[++layer] = bp;  in link_PullPacket()
301       lproto[layer] = proto;  in link_PullPacket()
307 link_Stack(struct link *l, struct layer *layer)  in link_Stack()  argument
309   if (l->nlayers == sizeof l->layer / sizeof l->layer[0]) {  in link_Stack()
311                l->name, layer->name);  in link_Stack()
314   l->layer[l->nlayers++] = layer;  in link_Stack()
378   int layer;  in link_ShowLayers()  local
380   for (layer = l->nlayers; layer; layer--)  in link_ShowLayers()
381     prompt_Printf(arg->prompt, "%s%s", layer == l->nlayers ? "" : ", ",  in link_ShowLayers()
382                   l->layer[layer - 1]->name);  in link_ShowLayers()