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Posted to commits@nuttx.apache.org by xi...@apache.org on 2022/10/21 08:57:41 UTC
[incubator-nuttx] branch master updated: arch/sim: fix MTU mismatch on TAP device in host route mode
This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git
The following commit(s) were added to refs/heads/master by this push:
new 4ac44bc8b5 arch/sim: fix MTU mismatch on TAP device in host route mode
4ac44bc8b5 is described below
commit 4ac44bc8b5febd8ef3ab809a439bcf705567bb17
Author: Zhe Weng <we...@xiaomi.com>
AuthorDate: Thu Oct 20 19:01:02 2022 +0800
arch/sim: fix MTU mismatch on TAP device in host route mode
In host route mode (bridge mode disabled), the d_pktsize of TAP device is not initialized and will be set to CONFIG_NET_ETH_PKTSIZE in netdev_register, while the MTU on host side keeps at 1500. Input packets larger than CONFIG_NET_ETH_PKTSIZE will be dropped because 'IP packet shorter than length in IP header'.
This patch fix this issue by reading MTU from host side and set as d_pktsize, just the same as what is done in bridge mode.
Signed-off-by: Zhe Weng <we...@xiaomi.com>
---
arch/sim/src/sim/posix/up_tapdev.c | 10 +++++-----
arch/sim/src/sim/up_netdriver.c | 2 +-
2 files changed, 6 insertions(+), 6 deletions(-)
diff --git a/arch/sim/src/sim/posix/up_tapdev.c b/arch/sim/src/sim/posix/up_tapdev.c
index 2be0568b76..ce518006da 100644
--- a/arch/sim/src/sim/posix/up_tapdev.c
+++ b/arch/sim/src/sim/posix/up_tapdev.c
@@ -189,10 +189,7 @@ void tapdev_init(int devidx, void *priv,
struct ifreq ifr;
int tapdevfd;
int ret;
-
-#ifdef CONFIG_SIM_NET_BRIDGE
int sockfd;
-#endif
/* Open the tap device */
@@ -219,7 +216,6 @@ void tapdev_init(int devidx, void *priv,
strncpy(gdevname[devidx], ifr.ifr_name, IFNAMSIZ);
-#ifdef CONFIG_SIM_NET_BRIDGE
/* Get a socket with which to manipulate the tap device; the remaining
* ioctl calls unfortunately won't work on the tap device fd.
*/
@@ -232,6 +228,7 @@ void tapdev_init(int devidx, void *priv,
return;
}
+#ifdef CONFIG_SIM_NET_BRIDGE
/* Assign the tap device to a bridge */
memset(&ifr, 0, sizeof(ifr));
@@ -248,6 +245,10 @@ void tapdev_init(int devidx, void *priv,
close(tapdevfd);
return;
}
+#else
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, gdevname[devidx], IFNAMSIZ);
+#endif
ret = ioctl(sockfd, SIOCGIFMTU, &ifr);
close(sockfd);
@@ -262,7 +263,6 @@ void tapdev_init(int devidx, void *priv,
{
netdriver_setmtu(devidx, ifr.ifr_mtu);
}
-#endif
gtapdevfd[devidx] = tapdevfd;
g_priv[devidx] = priv;
diff --git a/arch/sim/src/sim/up_netdriver.c b/arch/sim/src/sim/up_netdriver.c
index 93c294d5d1..af9d1437d8 100644
--- a/arch/sim/src/sim/up_netdriver.c
+++ b/arch/sim/src/sim/up_netdriver.c
@@ -441,7 +441,7 @@ void netdriver_setmacaddr(int devidx, unsigned char *macaddr)
void netdriver_setmtu(int devidx, int mtu)
{
- g_sim_dev[devidx].d_pktsize = mtu;
+ g_sim_dev[devidx].d_pktsize = mtu + ETH_HDRLEN;
}
void netdriver_loop(void)