2  * Copyright (c) 1988-1997
5  * Copyright (c) 1998-2012  Michael Richardson <mcr@tcpdump.org>
29 #include "netdissect-stdinc.h"
43  * This should be called at the beginning of the program; it does
63 		return (-1);  in nd_init()
69 	 * XXX - should we just fail if this fails?  Some of the  in nd_init()
70 	 * libsmi calls may fail.  in nd_init()
77 	 * "unused argument" warnings at compile time.  in nd_init()
128 		return (-1);  in nd_load_smi_module()
135 	return (-1);  in nd_load_smi_module()
158 		return (0);	/* fail */  in nd_push_buffer()
159 	ndspi->ndspi_buffer = new_buffer;  in nd_push_buffer()
160 	ndspi->ndspi_packetp = ndo->ndo_packetp;  in nd_push_buffer()
161 	ndspi->ndspi_snapend = ndo->ndo_snapend;  in nd_push_buffer()
162 	ndspi->ndspi_prev = ndo->ndo_packet_info_stack;  in nd_push_buffer()
164 	ndo->ndo_packetp = new_packetp;  in nd_push_buffer()
165 	ndo->ndo_snapend = new_packetp + newlen;  in nd_push_buffer()
166 	ndo->ndo_packet_info_stack = ndspi;  in nd_push_buffer()
179  *    the packet, calculate a new snapshot end that's at the lower
180  *    of the current snapshot end and that point in the packet;
182  *    set the snapshot end to that new value.
192 		return (0);	/* fail */  in nd_push_snaplen()
193 	ndspi->ndspi_buffer = NULL;	/* no new buffer */  in nd_push_snaplen()
194 	ndspi->ndspi_packetp = ndo->ndo_packetp;  in nd_push_snaplen()
195 	ndspi->ndspi_snapend = ndo->ndo_snapend;  in nd_push_snaplen()
196 	ndspi->ndspi_prev = ndo->ndo_packet_info_stack;  in nd_push_snaplen()
201 	ndo->ndo_packet_info_stack = ndspi;  in nd_push_snaplen()
206 	 * We're restricted to packets with at most UINT_MAX bytes;  in nd_push_snaplen()
210 	 * should at most be equal to snapend, and must *never*  in nd_push_snaplen()
213 	snaplen_remaining = (u_int)(ndo->ndo_snapend - bp);  in nd_push_snaplen()
222 		ndo->ndo_snapend = bp + newlen;  in nd_push_snaplen()
232  *    the packet, calculate a new snapshot end that's at the lower
233  *    of the previous snapshot end - or, if there is no previous
234  *    snapshot end, the current snapshot end - and that point in the
237  *    set the snapshot end to that new value.
239  * This is to change the current snapshot end.  This may increase the
240  * snapshot end, as it may be used, for example, for a Jumbo Payload
251 	ndspi = ndo->ndo_packet_info_stack;  in nd_change_snaplen()
252 	if (ndspi->ndspi_prev != NULL)  in nd_change_snaplen()
253 		previous_snapend = ndspi->ndspi_prev->ndspi_snapend;  in nd_change_snaplen()
255 		previous_snapend = ndo->ndo_snapend;  in nd_change_snaplen()
259 	 * snapend - or, if there is no previous snapend, after  in nd_change_snaplen()
262 	 * We're restricted to packets with at most UINT_MAX bytes;  in nd_change_snaplen()
266 	 * should at most be equal to snapend, and must *never*  in nd_change_snaplen()
269 	snaplen_remaining = (u_int)(previous_snapend - bp);  in nd_change_snaplen()
278 		ndo->ndo_snapend = bp + newlen;  in nd_change_snaplen()
287 	ndspi = ndo->ndo_packet_info_stack;  in nd_pop_packet_info()
288 	ndo->ndo_packetp = ndspi->ndspi_packetp;  in nd_pop_packet_info()
289 	ndo->ndo_snapend = ndspi->ndspi_snapend;  in nd_pop_packet_info()
290 	ndo->ndo_packet_info_stack = ndspi->ndspi_prev;  in nd_pop_packet_info()
292 	free(ndspi->ndspi_buffer);  in nd_pop_packet_info()
299 	while (ndo->ndo_packet_info_stack != NULL)  in nd_pop_all_packet_info()