netdev - [v3] pktgen: Allow configuration of IPv6 source address range

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Date:   Tue, 14 Jan 2020 09:01:22 +0800
From:   Niu Xilei <niu_xilei@....com>
To:     davem@...emloft.net
Cc:     tglx@...utronix.de, fw@...len.de, peterz@...radead.org,
        steffen.klassert@...unet.com, bigeasy@...utronix.de,
        jonathan.lemon@...il.com, pabeni@...hat.com,
        anshuman.khandual@....com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Niu Xilei <niu_xilei@....com>
Subject: [v3] pktgen: Allow configuration of IPv6 source address range

Pktgen can use only one IPv6 source address from output device or src6
command setting. In pressure test we need create lots of sessions more than
65535. So add src6_min and src6_max command to set the range.

Signed-off-by: Niu Xilei <niu_xilei@....com>

Changes since v2:
 - reword subject line
Changes since v1:
 - only create IPv6 source address over least significant 64 bit range
---
 net/core/pktgen.c | 90 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 294bfcf0ce0e..33435ae0ba68 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -1355,6 +1355,49 @@ static ssize_t pktgen_if_write(struct file *file,
 		sprintf(pg_result, "OK: dst6_max=%s", buf);
 		return count;
 	}
+	if (!strcmp(name, "src6_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;
+
+		in6_pton(buf, -1, pkt_dev->min_in6_saddr.s6_addr, -1, NULL);
+		snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->min_in6_saddr);
+
+		pkt_dev->cur_in6_saddr = pkt_dev->min_in6_saddr;
+		if (debug)
+			pr_debug("src6_min set to: %s\n", buf);
+
+		i += len;
+		sprintf(pg_result, "OK: src6_min=%s", buf);
+		return count;
+	}
+	if (!strcmp(name, "src6_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;
+
+		in6_pton(buf, -1, pkt_dev->max_in6_saddr.s6_addr, -1, NULL);
+		snprintf(buf, sizeof(buf), "%pI6c", &pkt_dev->max_in6_saddr);
+
+		if (debug)
+			pr_debug("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)
@@ -2286,6 +2329,51 @@ static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
 	pkt_dev->cur_queue_map  = pkt_dev->cur_queue_map % pkt_dev->odev->real_num_tx_queues;
 }
 
+/* generate ipv6 source addr */
+static inline void set_src_in6_addr(struct pktgen_dev *pkt_dev)
+{
+	__be64 min6_h, min6_l, max6_h, max6_l, addr_l, *t;
+	u64 min6, max6, rand, i;
+	struct in6_addr addr6;
+
+	memcpy(&min6_h, pkt_dev->min_in6_saddr.s6_addr, 8);
+	memcpy(&min6_l, pkt_dev->min_in6_saddr.s6_addr + 8, 8);
+	memcpy(&max6_h, pkt_dev->max_in6_saddr.s6_addr, 8);
+	memcpy(&max6_l, pkt_dev->max_in6_saddr.s6_addr + 8, 8);
+
+	/* only generate source address in least significant 64 bits range
+	 * most significant 64 bits must be equal
+	 */
+	if (max6_h != min6_h)
+		return;
+
+	addr6 = pkt_dev->min_in6_saddr;
+	t = (__be64 *)addr6.s6_addr + 1;
+	min6 = be64_to_cpu(min6_l);
+	max6 = be64_to_cpu(max6_l);
+
+	if (min6 < max6) {
+		if (pkt_dev->flags & F_IPSRC_RND) {
+			do {
+				prandom_bytes(&rand, sizeof(rand));
+				rand = rand % (max6 - min6) + min6;
+				addr_l = cpu_to_be64(rand);
+				memcpy(t, &addr_l, 8);
+			} while (ipv6_addr_loopback(&addr6) ||
+				 ipv6_addr_v4mapped(&addr6) ||
+				 ipv6_addr_is_multicast(&addr6));
+		} else {
+			addr6 = pkt_dev->cur_in6_saddr;
+			i = be64_to_cpu(*t);
+			if (++i > max6)
+				i = min6;
+			addr_l = cpu_to_be64(i);
+			memcpy(t, &addr_l, 8);
+		}
+	}
+	pkt_dev->cur_in6_saddr = addr6;
+}
+
 /* Increment/randomize headers according to flags and current values
  * for IP src/dest, UDP src/dst port, MAC-Addr src/dst
  */
@@ -2454,6 +2542,8 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
 		}
 	} else {		/* IPV6 * */
 
+		set_src_in6_addr(pkt_dev);
+
 		if (!ipv6_addr_any(&pkt_dev->min_in6_daddr)) {
 			int i;
 
-- 
2.20.1