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udp: prefer correctly bound pcbs when receiving broadcast

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See bug #53301

Signed-off-by: Simon Goldschmidt <goldsimon@gmx.de>
This commit is contained in:
Simon Goldschmidt
2018-06-13 22:01:18 +02:00
parent 1bdc669b45
commit b0e5eeb7d2
2 changed files with 288 additions and 0 deletions
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11
src/core/udp.c
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@@ -265,6 +265,17 @@ udp_input(struct pbuf *p, struct netif *inp)
if (uncon_pcb == NULL) {
/* the first unconnected matching PCB */
uncon_pcb = pcb;
#if LWIP_IPV4
} else if (broadcast && ip4_current_dest_addr()->addr == IPADDR_BROADCAST) {
/* global broadcast address (only valid for IPv4; match was checked before) */
if (!IP_IS_V4_VAL(uncon_pcb->local_ip) || !ip4_addr_cmp(ip_2_ip4(&uncon_pcb->local_ip), netif_ip4_addr(inp))) {
/* uncon_pcb does not match the input netif, check this pcb */
if (IP_IS_V4_VAL(pcb->local_ip) && ip4_addr_cmp(ip_2_ip4(&pcb->local_ip), netif_ip4_addr(inp))) {
/* better match */
uncon_pcb = pcb;
}
}
#endif /* LWIP_IPV4 */
}
#if SO_REUSE
else if (!ip_addr_isany(&pcb->local_ip)) {