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arch/sim: fix MTU mismatch on TAP device in host route mode

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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 <wengzhe@xiaomi.com>
This commit is contained in:
Zhe Weng 2022-10-20 19:01:02 +08:00 committed by Xiang Xiao
parent ae3e1d8ec5
commit 4ac44bc8b5
2 changed files with 6 additions and 6 deletions
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10
arch/sim/src/sim/posix/up_tapdev.c
View File

@ -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;

2
arch/sim/src/sim/up_netdriver.c
View File

@ -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)