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Merge branch 'bugfix/fix_crash_when_send_udp_too_big_v3.1' into 'release/v3.1'

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lw-ip: Drop packets larger than MTU (backport v3.1)

See merge request espressif/esp-idf!7291
This commit is contained in:
Jiang Jiang Jian 2020-01-20 15:17:50 +08:00
commit 9ebf0bb363
2 changed files with 3 additions and 1 deletions
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2
components/lwip/Kconfig
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@ -85,7 +85,7 @@ config LWIP_DHCP_MAX_NTP_SERVERS
config LWIP_IP_FRAG
bool "Enable fragment outgoing IP packets"
default n
default y
help
Enabling this option allows fragmenting outgoing IP packets if their size
exceeds MTU.

2
components/lwip/core/ipv4/ip4.c
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@ -980,6 +980,8 @@ ip4_output_if_opt_src(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *d
if (netif->mtu && (p->tot_len > netif->mtu)) {
return ip4_frag(p, netif, dest);
}
#else
LWIP_ERROR("ip4_output_if: Packets larger than MTU, discarded!!!",!(netif->mtu && p->tot_len > netif->mtu),return ERR_IF;);
#endif /* IP_FRAG */
LWIP_DEBUGF(IP_DEBUG, ("ip4_output_if: call netif->output()\n"));