[PATCH net-next] pktgen: add ttl option for pktgen
From: Zhouyi Zhou <hidden>
Date: 2014-07-30 08:21:54
I think it is useful to add ttl option for pktgen, for example if a some ISP want to test its network quality, it could set ttl so that the tested links get the packet while end users won't get it. Also, add a blank line after declarations in pktgen.c Signed-off-by: Zhouyi Zhou <redacted> --- Documentation/networking/pktgen.txt | 2 +- net/core/pktgen.c | 24 ++++++++++++++++++++++++ 2 files changed, 25 insertions(+), 1 deletions(-)
diff --git a/Documentation/networking/pktgen.txt b/Documentation/networking/pktgen.txt
index 0dffc6e..abad388 100644
--- a/Documentation/networking/pktgen.txt
+++ b/Documentation/networking/pktgen.txt@@ -180,7 +180,7 @@ Examples: pgset "vlan_id 9999" > 4095 remove vlan and svlan tags pgset "svlan 9999" > 4095 remove svlan tag - + pgset "ttl xx" set former IPv4 TTL field (default 32) pgset "tos XX" set former IPv4 TOS field (e.g. "tos 28" for AF11 no ECN, default 00) pgset "traffic_class XX" set former IPv6 TRAFFIC CLASS (e.g. "traffic_class B8" for EF no ECN, default 00)
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 8b849dd..54cb750 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c@@ -318,6 +318,8 @@ struct pktgen_dev { __u16 udp_dst_min; /* inclusive, dest UDP port */ __u16 udp_dst_max; /* exclusive, dest UDP port */ + __u8 ttl; /* time to live */ + /* DSCP + ECN */ __u8 tos; /* six MSB of (former) IPv4 TOS are for dscp codepoint */
@@ -606,6 +608,8 @@ static int pktgen_if_show(struct seq_file *seq, void *v) pkt_dev->svlan_id, pkt_dev->svlan_p, pkt_dev->svlan_cfi); + seq_printf(seq, " ttl: 0x%02x\n", pkt_dev->ttl); + if (pkt_dev->tos) seq_printf(seq, " tos: 0x%02x\n", pkt_dev->tos);
@@ -1667,8 +1671,26 @@ static ssize_t pktgen_if_write(struct file *file, return count; } + if (!strcmp(name, "ttl")) { + __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->ttl = tmp_value; + sprintf(pg_result, "OK: ttl=0x%02x", pkt_dev->ttl); + } else { + sprintf(pg_result, "ERROR: tos must be 00-ff"); + } + return count; + } + if (!strcmp(name, "tos")) { __u32 tmp_value = 0; + len = hex32_arg(&user_buffer[i], 2, &tmp_value); if (len < 0) return len;
@@ -1685,6 +1707,7 @@ static ssize_t pktgen_if_write(struct file *file, if (!strcmp(name, "traffic_class")) { __u32 tmp_value = 0; + len = hex32_arg(&user_buffer[i], 2, &tmp_value); if (len < 0) return len;
@@ -3558,6 +3581,7 @@ static int pktgen_add_device(struct pktgen_thread *t, const char *ifname) pkt_dev->udp_src_max = 9; pkt_dev->udp_dst_min = 9; pkt_dev->udp_dst_max = 9; + pkt_dev->ttl = 32; pkt_dev->vlan_p = 0; pkt_dev->vlan_cfi = 0; pkt_dev->vlan_id = 0xffff;
--
1.7.1