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fix the bug that TCP connections don't abort when IP changed

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This commit is contained in:
zhangyanjiao 2018-06-07 11:24:03 +08:00
parent c77f84e788
commit b5f4bf922f
4 changed files with 66 additions and 14 deletions
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10
components/lwip/Kconfig
View file

@ -329,6 +329,16 @@ config TCP_QUEUE_OOSEQ
Disable this option to save some RAM during TCP sessions, at the expense
of increased retransmissions if segments arrive out of order.
config ESP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES
bool "Keep TCP connections when IP changed"
default n
help
This option is enabled when the following scenario happen:
network dropped and reconnected, IP changes is like: 192.168.0.2->0.0.0.0->192.168.0.2
Disable this option to keep consistent with the original LWIP code behavior.
choice TCP_OVERSIZE
prompt "Pre-allocate transmit PBUF size"
default TCP_OVERSIZE_MSS

4
components/lwip/core/netif.c
View file

@ -453,10 +453,10 @@ void
netif_set_ipaddr(struct netif *netif, const ip4_addr_t *ipaddr)
{
ip4_addr_t new_addr = (ipaddr ? *ipaddr : *IP4_ADDR_ANY);
#if ESP_LWIP
#if ESP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES
ip4_addr_t *last_addr = ip_2_ip4(&netif->last_ip_addr);
#else
ip4_addr_t *last_addr = netif_ip4_addr(netif);
ip4_addr_t *last_addr = ip_2_ip4(&(netif->ip_addr));
#endif
/* address is actually being changed? */

36
components/lwip/core/tcp.c
View file

@ -1929,6 +1929,31 @@ tcp_eff_send_mss_impl(u16_t sendmss, const ip_addr_t *dest
}
#endif /* TCP_CALCULATE_EFF_SEND_MSS */
/** Helper function for tcp_netif_ip4_addr_changed() that iterates a pcb list */
static void
tcp_netif_ip_addr_changed_pcblist(const ip4_addr_t* old_addr, struct tcp_pcb* pcb_list)
{
struct tcp_pcb *pcb;
pcb = pcb_list;
while (pcb != NULL) {
/* PCB bound to current local interface address? */
if (ip4_addr_cmp(ip_2_ip4(&pcb->local_ip), old_addr)
#if LWIP_AUTOIP
/* connections to link-local addresses must persist (RFC3927 ch. 1.9) */
&& (!IP_IS_V4_VAL(pcb->local_ip) || !ip4_addr_islinklocal(ip_2_ip4(&pcb->local_ip)))
#endif /* LWIP_AUTOIP */
) {
/* this connection must be aborted */
struct tcp_pcb *next = pcb->next;
LWIP_DEBUGF(NETIF_DEBUG | LWIP_DBG_STATE, ("netif_set_ipaddr: aborting TCP pcb %p\n", (void *)pcb));
tcp_abort(pcb);
pcb = next;
} else {
pcb = pcb->next;
}
}
}
#if LWIP_IPV4
/** This function is called from netif.c when address is changed or netif is removed
*
@ -1939,6 +1964,16 @@ void tcp_netif_ipv4_addr_changed(const ip4_addr_t* old_addr, const ip4_addr_t* n
{
struct tcp_pcb_listen *lpcb, *next;
if (!ip4_addr_isany(old_addr)) {
#if ESP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES
if ((new_addr == NULL) || ((!ip4_addr_isany_val(*new_addr)) && (!ip4_addr_cmp(old_addr, new_addr)))) {
#endif
tcp_netif_ip_addr_changed_pcblist(old_addr, tcp_active_pcbs);
tcp_netif_ip_addr_changed_pcblist(old_addr, tcp_bound_pcbs);
#if ESP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES
}
#endif
if (!ip4_addr_isany(new_addr)) {
/* PCB bound to current local interface address? */
for (lpcb = tcp_listen_pcbs.listen_pcbs; lpcb != NULL; lpcb = next) {
@ -1955,6 +1990,7 @@ void tcp_netif_ipv4_addr_changed(const ip4_addr_t* old_addr, const ip4_addr_t* n
}
}
}
}
}
#endif /* LWIP_IPV4 */

6
components/lwip/include/lwip/port/lwipopts.h
View file

@ -296,6 +296,12 @@
*/
#define TCP_QUEUE_OOSEQ CONFIG_TCP_QUEUE_OOSEQ
/**
* ESP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES==1: Keep TCP connection when IP changed
* scenario happens: 192.168.0.2 -> 0.0.0.0 -> 192.168.0.2 or 192.168.0.2 -> 0.0.0.0
*/
#define ESP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES CONFIG_ESP_TCP_KEEP_CONNECTION_WHEN_IP_CHANGES
/*
* LWIP_EVENT_API==1: The user defines lwip_tcp_event() to receive all
* events (accept, sent, etc) that happen in the system.