extractedLnx/linux-2.6.38/net/core/pktgen.c_pktgen_if_write.c

static ssize_t pktgen_if_write(struct file *file,
			       const char __user * user_buffer, size_t count,
			       loff_t * offset)
{
	struct seq_file *seq = file->private_data;
	struct pktgen_dev *pkt_dev = seq->private;
	int i, max, len;
	char name[16], valstr[32];
	unsigned long value = 0;
	char *pg_result = NULL;
	int tmp = 0;
	char buf[128];

	pg_result = &(pkt_dev->result[0]);

	if (count < 1) {
		pr_warning("wrong command format\n");
		return -EINVAL;
	}

	max = count;
	tmp = count_trail_chars(user_buffer, max);
	if (tmp < 0) {
		pr_warning("illegal format\n");
		return tmp;
	}
	i = tmp;

	/* Read variable name */

	len = strn_len(&user_buffer[i], sizeof(name) - 1);
	if (len < 0)
		return len;

	memset(name, 0, sizeof(name));
	if (copy_from_user(name, &user_buffer[i], len))
		return -EFAULT;
	i += len;

	max = count - i;
	len = count_trail_chars(&user_buffer[i], max);
	if (len < 0)
		return len;

	i += len;

	if (debug) {
		size_t copy = min_t(size_t, count, 1023);
		char tb[copy + 1];
		if (copy_from_user(tb, user_buffer, copy))
			return -EFAULT;
		tb[copy] = 0;
		printk(KERN_DEBUG "pktgen: %s,%lu  buffer -:%s:-\n", name,
		       (unsigned long)count, tb);
	}

	if (!strcmp(name, "min_pkt_size")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value < 14 + 20 + 8)
			value = 14 + 20 + 8;
		if (value != pkt_dev->min_pkt_size) {
			pkt_dev->min_pkt_size = value;
			pkt_dev->cur_pkt_size = value;
		}
		sprintf(pg_result, "OK: min_pkt_size=%u",
			pkt_dev->min_pkt_size);
		return count;
	}

	if (!strcmp(name, "max_pkt_size")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value < 14 + 20 + 8)
			value = 14 + 20 + 8;
		if (value != pkt_dev->max_pkt_size) {
			pkt_dev->max_pkt_size = value;
			pkt_dev->cur_pkt_size = value;
		}
		sprintf(pg_result, "OK: max_pkt_size=%u",
			pkt_dev->max_pkt_size);
		return count;
	}

	/* Shortcut for min = max */

	if (!strcmp(name, "pkt_size")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value < 14 + 20 + 8)
			value = 14 + 20 + 8;
		if (value != pkt_dev->min_pkt_size) {
			pkt_dev->min_pkt_size = value;
			pkt_dev->max_pkt_size = value;
			pkt_dev->cur_pkt_size = value;
		}
		sprintf(pg_result, "OK: pkt_size=%u", pkt_dev->min_pkt_size);
		return count;
	}

	if (!strcmp(name, "debug")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		debug = value;
		sprintf(pg_result, "OK: debug=%u", debug);
		return count;
	}

	if (!strcmp(name, "frags")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		pkt_dev->nfrags = value;
		sprintf(pg_result, "OK: frags=%u", pkt_dev->nfrags);
		return count;
	}
	if (!strcmp(name, "delay")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value == 0x7FFFFFFF)
			pkt_dev->delay = ULLONG_MAX;
		else
			pkt_dev->delay = (u64)value;

		sprintf(pg_result, "OK: delay=%llu",
			(unsigned long long) pkt_dev->delay);
		return count;
	}
	if (!strcmp(name, "rate")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (!value)
			return len;
		pkt_dev->delay = pkt_dev->min_pkt_size*8*NSEC_PER_USEC/value;
		if (debug)
			pr_info("Delay set at: %llu ns\n", pkt_dev->delay);

		sprintf(pg_result, "OK: rate=%lu", value);
		return count;
	}
	if (!strcmp(name, "ratep")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (!value)
			return len;
		pkt_dev->delay = NSEC_PER_SEC/value;
		if (debug)
			pr_info("Delay set at: %llu ns\n", pkt_dev->delay);

		sprintf(pg_result, "OK: rate=%lu", value);
		return count;
	}
	if (!strcmp(name, "udp_src_min")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value != pkt_dev->udp_src_min) {
			pkt_dev->udp_src_min = value;
			pkt_dev->cur_udp_src = value;
		}
		sprintf(pg_result, "OK: udp_src_min=%u", pkt_dev->udp_src_min);
		return count;
	}
	if (!strcmp(name, "udp_dst_min")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value != pkt_dev->udp_dst_min) {
			pkt_dev->udp_dst_min = value;
			pkt_dev->cur_udp_dst = value;
		}
		sprintf(pg_result, "OK: udp_dst_min=%u", pkt_dev->udp_dst_min);
		return count;
	}
	if (!strcmp(name, "udp_src_max")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value != pkt_dev->udp_src_max) {
			pkt_dev->udp_src_max = value;
			pkt_dev->cur_udp_src = value;
		}
		sprintf(pg_result, "OK: udp_src_max=%u", pkt_dev->udp_src_max);
		return count;
	}
	if (!strcmp(name, "udp_dst_max")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value != pkt_dev->udp_dst_max) {
			pkt_dev->udp_dst_max = value;
			pkt_dev->cur_udp_dst = value;
		}
		sprintf(pg_result, "OK: udp_dst_max=%u", pkt_dev->udp_dst_max);
		return count;
	}
	if (!strcmp(name, "clone_skb")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		pkt_dev->clone_skb = value;

		sprintf(pg_result, "OK: clone_skb=%d", pkt_dev->clone_skb);
		return count;
	}
	if (!strcmp(name, "count")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		pkt_dev->count = value;
		sprintf(pg_result, "OK: count=%llu",
			(unsigned long long)pkt_dev->count);
		return count;
	}
	if (!strcmp(name, "src_mac_count")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (pkt_dev->src_mac_count != value) {
			pkt_dev->src_mac_count = value;
			pkt_dev->cur_src_mac_offset = 0;
		}
		sprintf(pg_result, "OK: src_mac_count=%d",
			pkt_dev->src_mac_count);
		return count;
	}
	if (!strcmp(name, "dst_mac_count")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (pkt_dev->dst_mac_count != value) {
			pkt_dev->dst_mac_count = value;
			pkt_dev->cur_dst_mac_offset = 0;
		}
		sprintf(pg_result, "OK: dst_mac_count=%d",
			pkt_dev->dst_mac_count);
		return count;
	}
	if (!strcmp(name, "node")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;

		if (node_possible(value)) {
			pkt_dev->node = value;
			sprintf(pg_result, "OK: node=%d", pkt_dev->node);
		}
		else
			sprintf(pg_result, "ERROR: node not possible");
		return count;
	}
	if (!strcmp(name, "flag")) {
		char f[32];
		memset(f, 0, 32);
		len = strn_len(&user_buffer[i], sizeof(f) - 1);
		if (len < 0)
			return len;

		if (copy_from_user(f, &user_buffer[i], len))
			return -EFAULT;
		i += len;
		if (strcmp(f, "IPSRC_RND") == 0)
			pkt_dev->flags |= F_IPSRC_RND;

		else if (strcmp(f, "!IPSRC_RND") == 0)
			pkt_dev->flags &= ~F_IPSRC_RND;

		else if (strcmp(f, "TXSIZE_RND") == 0)
			pkt_dev->flags |= F_TXSIZE_RND;

		else if (strcmp(f, "!TXSIZE_RND") == 0)
			pkt_dev->flags &= ~F_TXSIZE_RND;

		else if (strcmp(f, "IPDST_RND") == 0)
			pkt_dev->flags |= F_IPDST_RND;

		else if (strcmp(f, "!IPDST_RND") == 0)
			pkt_dev->flags &= ~F_IPDST_RND;

		else if (strcmp(f, "UDPSRC_RND") == 0)
			pkt_dev->flags |= F_UDPSRC_RND;

		else if (strcmp(f, "!UDPSRC_RND") == 0)
			pkt_dev->flags &= ~F_UDPSRC_RND;

		else if (strcmp(f, "UDPDST_RND") == 0)
			pkt_dev->flags |= F_UDPDST_RND;

		else if (strcmp(f, "!UDPDST_RND") == 0)
			pkt_dev->flags &= ~F_UDPDST_RND;

		else if (strcmp(f, "MACSRC_RND") == 0)
			pkt_dev->flags |= F_MACSRC_RND;

		else if (strcmp(f, "!MACSRC_RND") == 0)
			pkt_dev->flags &= ~F_MACSRC_RND;

		else if (strcmp(f, "MACDST_RND") == 0)
			pkt_dev->flags |= F_MACDST_RND;

		else if (strcmp(f, "!MACDST_RND") == 0)
			pkt_dev->flags &= ~F_MACDST_RND;

		else if (strcmp(f, "MPLS_RND") == 0)
			pkt_dev->flags |= F_MPLS_RND;

		else if (strcmp(f, "!MPLS_RND") == 0)
			pkt_dev->flags &= ~F_MPLS_RND;

		else if (strcmp(f, "VID_RND") == 0)
			pkt_dev->flags |= F_VID_RND;

		else if (strcmp(f, "!VID_RND") == 0)
			pkt_dev->flags &= ~F_VID_RND;

		else if (strcmp(f, "SVID_RND") == 0)
			pkt_dev->flags |= F_SVID_RND;

		else if (strcmp(f, "!SVID_RND") == 0)
			pkt_dev->flags &= ~F_SVID_RND;

		else if (strcmp(f, "FLOW_SEQ") == 0)
			pkt_dev->flags |= F_FLOW_SEQ;

		else if (strcmp(f, "QUEUE_MAP_RND") == 0)
			pkt_dev->flags |= F_QUEUE_MAP_RND;

		else if (strcmp(f, "!QUEUE_MAP_RND") == 0)
			pkt_dev->flags &= ~F_QUEUE_MAP_RND;

		else if (strcmp(f, "QUEUE_MAP_CPU") == 0)
			pkt_dev->flags |= F_QUEUE_MAP_CPU;

		else if (strcmp(f, "!QUEUE_MAP_CPU") == 0)
			pkt_dev->flags &= ~F_QUEUE_MAP_CPU;
#ifdef CONFIG_XFRM
		else if (strcmp(f, "IPSEC") == 0)
			pkt_dev->flags |= F_IPSEC_ON;
#endif

		else if (strcmp(f, "!IPV6") == 0)
			pkt_dev->flags &= ~F_IPV6;

		else if (strcmp(f, "NODE_ALLOC") == 0)
			pkt_dev->flags |= F_NODE;

		else if (strcmp(f, "!NODE_ALLOC") == 0)
			pkt_dev->flags &= ~F_NODE;

		else {
			sprintf(pg_result,
				"Flag -:%s:- unknown\nAvailable flags, (prepend ! to un-set flag):\n%s",
				f,
				"IPSRC_RND, IPDST_RND, UDPSRC_RND, UDPDST_RND, "
				"MACSRC_RND, MACDST_RND, TXSIZE_RND, IPV6, MPLS_RND, VID_RND, SVID_RND, FLOW_SEQ, IPSEC, NODE_ALLOC\n");
			return count;
		}
		sprintf(pg_result, "OK: flags=0x%x", pkt_dev->flags);
		return count;
	}
	if (!strcmp(name, "dst_min") || !strcmp(name, "dst")) {
		len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_min) - 1);
		if (len < 0)
			return len;

		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;
		buf[len] = 0;
		if (strcmp(buf, pkt_dev->dst_min) != 0) {
			memset(pkt_dev->dst_min, 0, sizeof(pkt_dev->dst_min));
			strncpy(pkt_dev->dst_min, buf, len);
			pkt_dev->daddr_min = in_aton(pkt_dev->dst_min);
			pkt_dev->cur_daddr = pkt_dev->daddr_min;
		}
		if (debug)
			printk(KERN_DEBUG "pktgen: dst_min set to: %s\n",
			       pkt_dev->dst_min);
		i += len;
		sprintf(pg_result, "OK: dst_min=%s", pkt_dev->dst_min);
		return count;
	}
	if (!strcmp(name, "dst_max")) {
		len = strn_len(&user_buffer[i], sizeof(pkt_dev->dst_max) - 1);
		if (len < 0)
			return len;


		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;

		buf[len] = 0;
		if (strcmp(buf, pkt_dev->dst_max) != 0) {
			memset(pkt_dev->dst_max, 0, sizeof(pkt_dev->dst_max));
			strncpy(pkt_dev->dst_max, buf, len);
			pkt_dev->daddr_max = in_aton(pkt_dev->dst_max);
			pkt_dev->cur_daddr = pkt_dev->daddr_max;
		}
		if (debug)
			printk(KERN_DEBUG "pktgen: dst_max set to: %s\n",
			       pkt_dev->dst_max);
		i += len;
		sprintf(pg_result, "OK: dst_max=%s", pkt_dev->dst_max);
		return count;
	}
	if (!strcmp(name, "dst6")) {
		len = strn_len(&user_buffer[i], sizeof(buf) - 1);
		if (len < 0)
			return len;

		pkt_dev->flags |= F_IPV6;

		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;
		buf[len] = 0;

		scan_ip6(buf, pkt_dev->in6_daddr.s6_addr);
		fmt_ip6(buf, pkt_dev->in6_daddr.s6_addr);

		ipv6_addr_copy(&pkt_dev->cur_in6_daddr, &pkt_dev->in6_daddr);

		if (debug)
			printk(KERN_DEBUG "pktgen: dst6 set to: %s\n", buf);

		i += len;
		sprintf(pg_result, "OK: dst6=%s", buf);
		return count;
	}
	if (!strcmp(name, "dst6_min")) {
		len = strn_len(&user_buffer[i], sizeof(buf) - 1);
		if (len < 0)
			return len;

		pkt_dev->flags |= F_IPV6;

		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;
		buf[len] = 0;

		scan_ip6(buf, pkt_dev->min_in6_daddr.s6_addr);
		fmt_ip6(buf, pkt_dev->min_in6_daddr.s6_addr);

		ipv6_addr_copy(&pkt_dev->cur_in6_daddr,
			       &pkt_dev->min_in6_daddr);
		if (debug)
			printk(KERN_DEBUG "pktgen: dst6_min set to: %s\n", buf);

		i += len;
		sprintf(pg_result, "OK: dst6_min=%s", buf);
		return count;
	}
	if (!strcmp(name, "dst6_max")) {
		len = strn_len(&user_buffer[i], sizeof(buf) - 1);
		if (len < 0)
			return len;

		pkt_dev->flags |= F_IPV6;

		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;
		buf[len] = 0;

		scan_ip6(buf, pkt_dev->max_in6_daddr.s6_addr);
		fmt_ip6(buf, pkt_dev->max_in6_daddr.s6_addr);

		if (debug)
			printk(KERN_DEBUG "pktgen: dst6_max set to: %s\n", buf);

		i += len;
		sprintf(pg_result, "OK: dst6_max=%s", buf);
		return count;
	}
	if (!strcmp(name, "src6")) {
		len = strn_len(&user_buffer[i], sizeof(buf) - 1);
		if (len < 0)
			return len;

		pkt_dev->flags |= F_IPV6;

		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;
		buf[len] = 0;

		scan_ip6(buf, pkt_dev->in6_saddr.s6_addr);
		fmt_ip6(buf, pkt_dev->in6_saddr.s6_addr);

		ipv6_addr_copy(&pkt_dev->cur_in6_saddr, &pkt_dev->in6_saddr);

		if (debug)
			printk(KERN_DEBUG "pktgen: src6 set to: %s\n", buf);

		i += len;
		sprintf(pg_result, "OK: src6=%s", buf);
		return count;
	}
	if (!strcmp(name, "src_min")) {
		len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_min) - 1);
		if (len < 0)
			return len;

		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;
		buf[len] = 0;
		if (strcmp(buf, pkt_dev->src_min) != 0) {
			memset(pkt_dev->src_min, 0, sizeof(pkt_dev->src_min));
			strncpy(pkt_dev->src_min, buf, len);
			pkt_dev->saddr_min = in_aton(pkt_dev->src_min);
			pkt_dev->cur_saddr = pkt_dev->saddr_min;
		}
		if (debug)
			printk(KERN_DEBUG "pktgen: src_min set to: %s\n",
			       pkt_dev->src_min);
		i += len;
		sprintf(pg_result, "OK: src_min=%s", pkt_dev->src_min);
		return count;
	}
	if (!strcmp(name, "src_max")) {
		len = strn_len(&user_buffer[i], sizeof(pkt_dev->src_max) - 1);
		if (len < 0)
			return len;

		if (copy_from_user(buf, &user_buffer[i], len))
			return -EFAULT;
		buf[len] = 0;
		if (strcmp(buf, pkt_dev->src_max) != 0) {
			memset(pkt_dev->src_max, 0, sizeof(pkt_dev->src_max));
			strncpy(pkt_dev->src_max, buf, len);
			pkt_dev->saddr_max = in_aton(pkt_dev->src_max);
			pkt_dev->cur_saddr = pkt_dev->saddr_max;
		}
		if (debug)
			printk(KERN_DEBUG "pktgen: src_max set to: %s\n",
			       pkt_dev->src_max);
		i += len;
		sprintf(pg_result, "OK: src_max=%s", pkt_dev->src_max);
		return count;
	}
	if (!strcmp(name, "dst_mac")) {
		char *v = valstr;
		unsigned char old_dmac[ETH_ALEN];
		unsigned char *m = pkt_dev->dst_mac;
		memcpy(old_dmac, pkt_dev->dst_mac, ETH_ALEN);

		len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
		if (len < 0)
			return len;

		memset(valstr, 0, sizeof(valstr));
		if (copy_from_user(valstr, &user_buffer[i], len))
			return -EFAULT;
		i += len;

		for (*m = 0; *v && m < pkt_dev->dst_mac + 6; v++) {
			int value;

			value = hex_to_bin(*v);
			if (value >= 0)
				*m = *m * 16 + value;

			if (*v == ':') {
				m++;
				*m = 0;
			}
		}

		/* Set up Dest MAC */
		if (compare_ether_addr(old_dmac, pkt_dev->dst_mac))
			memcpy(&(pkt_dev->hh[0]), pkt_dev->dst_mac, ETH_ALEN);

		sprintf(pg_result, "OK: dstmac");
		return count;
	}
	if (!strcmp(name, "src_mac")) {
		char *v = valstr;
		unsigned char old_smac[ETH_ALEN];
		unsigned char *m = pkt_dev->src_mac;

		memcpy(old_smac, pkt_dev->src_mac, ETH_ALEN);

		len = strn_len(&user_buffer[i], sizeof(valstr) - 1);
		if (len < 0)
			return len;

		memset(valstr, 0, sizeof(valstr));
		if (copy_from_user(valstr, &user_buffer[i], len))
			return -EFAULT;
		i += len;

		for (*m = 0; *v && m < pkt_dev->src_mac + 6; v++) {
			int value;

			value = hex_to_bin(*v);
			if (value >= 0)
				*m = *m * 16 + value;

			if (*v == ':') {
				m++;
				*m = 0;
			}
		}

		/* Set up Src MAC */
		if (compare_ether_addr(old_smac, pkt_dev->src_mac))
			memcpy(&(pkt_dev->hh[6]), pkt_dev->src_mac, ETH_ALEN);

		sprintf(pg_result, "OK: srcmac");
		return count;
	}

	if (!strcmp(name, "clear_counters")) {
		pktgen_clear_counters(pkt_dev);
		sprintf(pg_result, "OK: Clearing counters.\n");
		return count;
	}

	if (!strcmp(name, "flows")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		if (value > MAX_CFLOWS)
			value = MAX_CFLOWS;

		pkt_dev->cflows = value;
		sprintf(pg_result, "OK: flows=%u", pkt_dev->cflows);
		return count;
	}

	if (!strcmp(name, "flowlen")) {
		len = num_arg(&user_buffer[i], 10, &value);
		if (len < 0)
			return len;

		i += len;
		pkt_dev->lflow = value;
		sprintf(pg_result, "OK: flowlen=%u", pkt_dev->lflow);
		return count;
	}

	if (!strcmp(name, "queue_map_min")) {
		len = num_arg(&user_buffer[i], 5, &value);
		if (len < 0)
			return len;

		i += len;
		pkt_dev->queue_map_min = value;
		sprintf(pg_result, "OK: queue_map_min=%u", pkt_dev->queue_map_min);
		return count;
	}

	if (!strcmp(name, "queue_map_max")) {
		len = num_arg(&user_buffer[i], 5, &value);
		if (len < 0)
			return len;

		i += len;
		pkt_dev->queue_map_max = value;
		sprintf(pg_result, "OK: queue_map_max=%u", pkt_dev->queue_map_max);
		return count;
	}

	if (!strcmp(name, "mpls")) {
		unsigned n, cnt;

		len = get_labels(&user_buffer[i], pkt_dev);
		if (len < 0)
			return len;
		i += len;
		cnt = sprintf(pg_result, "OK: mpls=");
		for (n = 0; n < pkt_dev->nr_labels; n++)
			cnt += sprintf(pg_result + cnt,
				       "%08x%s", ntohl(pkt_dev->labels[n]),
				       n == pkt_dev->nr_labels-1 ? "" : ",");

		if (pkt_dev->nr_labels && pkt_dev->vlan_id != 0xffff) {
			pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
			pkt_dev->svlan_id = 0xffff;

			if (debug)
				printk(KERN_DEBUG "pktgen: VLAN/SVLAN auto turned off\n");
		}
		return count;
	}

	if (!strcmp(name, "vlan_id")) {
		len = num_arg(&user_buffer[i], 4, &value);
		if (len < 0)
			return len;

		i += len;
		if (value <= 4095) {
			pkt_dev->vlan_id = value;  /* turn on VLAN */

			if (debug)
				printk(KERN_DEBUG "pktgen: VLAN turned on\n");

			if (debug && pkt_dev->nr_labels)
				printk(KERN_DEBUG "pktgen: MPLS auto turned off\n");

			pkt_dev->nr_labels = 0;    /* turn off MPLS */
			sprintf(pg_result, "OK: vlan_id=%u", pkt_dev->vlan_id);
		} else {
			pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
			pkt_dev->svlan_id = 0xffff;

			if (debug)
				printk(KERN_DEBUG "pktgen: VLAN/SVLAN turned off\n");
		}
		return count;
	}

	if (!strcmp(name, "vlan_p")) {
		len = num_arg(&user_buffer[i], 1, &value);
		if (len < 0)
			return len;

		i += len;
		if ((value <= 7) && (pkt_dev->vlan_id != 0xffff)) {
			pkt_dev->vlan_p = value;
			sprintf(pg_result, "OK: vlan_p=%u", pkt_dev->vlan_p);
		} else {
			sprintf(pg_result, "ERROR: vlan_p must be 0-7");
		}
		return count;
	}

	if (!strcmp(name, "vlan_cfi")) {
		len = num_arg(&user_buffer[i], 1, &value);
		if (len < 0)
			return len;

		i += len;
		if ((value <= 1) && (pkt_dev->vlan_id != 0xffff)) {
			pkt_dev->vlan_cfi = value;
			sprintf(pg_result, "OK: vlan_cfi=%u", pkt_dev->vlan_cfi);
		} else {
			sprintf(pg_result, "ERROR: vlan_cfi must be 0-1");
		}
		return count;
	}

	if (!strcmp(name, "svlan_id")) {
		len = num_arg(&user_buffer[i], 4, &value);
		if (len < 0)
			return len;

		i += len;
		if ((value <= 4095) && ((pkt_dev->vlan_id != 0xffff))) {
			pkt_dev->svlan_id = value;  /* turn on SVLAN */

			if (debug)
				printk(KERN_DEBUG "pktgen: SVLAN turned on\n");

			if (debug && pkt_dev->nr_labels)
				printk(KERN_DEBUG "pktgen: MPLS auto turned off\n");

			pkt_dev->nr_labels = 0;    /* turn off MPLS */
			sprintf(pg_result, "OK: svlan_id=%u", pkt_dev->svlan_id);
		} else {
			pkt_dev->vlan_id = 0xffff; /* turn off VLAN/SVLAN */
			pkt_dev->svlan_id = 0xffff;

			if (debug)
				printk(KERN_DEBUG "pktgen: VLAN/SVLAN turned off\n");
		}
		return count;
	}

	if (!strcmp(name, "svlan_p")) {
		len = num_arg(&user_buffer[i], 1, &value);
		if (len < 0)
			return len;

		i += len;
		if ((value <= 7) && (pkt_dev->svlan_id != 0xffff)) {
			pkt_dev->svlan_p = value;
			sprintf(pg_result, "OK: svlan_p=%u", pkt_dev->svlan_p);
		} else {
			sprintf(pg_result, "ERROR: svlan_p must be 0-7");
		}
		return count;
	}

	if (!strcmp(name, "svlan_cfi")) {
		len = num_arg(&user_buffer[i], 1, &value);
		if (len < 0)
			return len;

		i += len;
		if ((value <= 1) && (pkt_dev->svlan_id != 0xffff)) {
			pkt_dev->svlan_cfi = value;
			sprintf(pg_result, "OK: svlan_cfi=%u", pkt_dev->svlan_cfi);
		} else {
			sprintf(pg_result, "ERROR: svlan_cfi must be 0-1");
		}
		return count;
	}

	if (!strcmp(name, "tos")) {
		__u32 tmp_value = 0;
		len = hex32_arg(&user_buffer[i], 2, &tmp_value);
		if (len < 0)
			return len;

		i += len;
		if (len == 2) {
			pkt_dev->tos = tmp_value;
			sprintf(pg_result, "OK: tos=0x%02x", pkt_dev->tos);
		} else {
			sprintf(pg_result, "ERROR: tos must be 00-ff");
		}
		return count;
	}

	if (!strcmp(name, "traffic_class")) {
		__u32 tmp_value = 0;
		len = hex32_arg(&user_buffer[i], 2, &tmp_value);
		if (len < 0)
			return len;

		i += len;
		if (len == 2) {
			pkt_dev->traffic_class = tmp_value;
			sprintf(pg_result, "OK: traffic_class=0x%02x", pkt_dev->traffic_class);
		} else {
			sprintf(pg_result, "ERROR: traffic_class must be 00-ff");
		}
		return count;
	}

	if (!strcmp(name, "skb_priority")) {
		len = num_arg(&user_buffer[i], 9, &value);
		if (len < 0)
			return len;

		i += len;
		pkt_dev->skb_priority = value;
		sprintf(pg_result, "OK: skb_priority=%i",
			pkt_dev->skb_priority);
		return count;
	}

	sprintf(pkt_dev->result, "No such parameter \"%s\"", name);
	return -EINVAL;
}