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Added an optional define (LWIP_IP_ACCEPT_UDP_PORT) that can allow link-layer-addressed UDP traffic to be received while a netif is down (just like DHCP during configuration)

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This commit is contained in:
goldsimon 2010-06-16 12:25:00 +00:00
parent 6ccc2ef804
commit 1242575f0f
2 changed files with 42 additions and 7 deletions
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5
CHANGELOG
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@ -13,6 +13,11 @@ HISTORY
++ New features:
2010-06-16: Simon Goldschmidt
* ip.c: Added an optional define (LWIP_IP_ACCEPT_UDP_PORT) that can allow
link-layer-addressed UDP traffic to be received while a netif is down (just
like DHCP during configuration)
2010-05-22: Simon Goldschmidt
* many many files: bug #27352: removed packing from ip_addr_t, the packed
version is now only used in protocol headers. Added global storage for

44
src/core/ipv4/ip.c
View File

@ -69,6 +69,30 @@
#define CHECKSUM_GEN_IP_INLINE 0
#endif
#if LWIP_DHCP || defined(LWIP_IP_ACCEPT_UDP_PORT)
#define IP_ACCEPT_LINK_LAYER_ADDRESSING 1
/** Some defines for DHCP to let link-layer-addressed packets through while the
* netif is down.
* To use this in your own application/protocol, define LWIP_IP_ACCEPT_UDP_PORT
* to return 1 if the port is accepted and 0 if the port is not accepted.
*/
#if LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT)
/* accept DHCP client port and custom port */
#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (((port) == PP_NTOHS(DHCP_CLIENT_PORT)) \
|| (LWIP_IP_ACCEPT_UDP_PORT(dst_port)))
#elif defined(LWIP_IP_ACCEPT_UDP_PORT) /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) *)
/* accept custom port only */
#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) (LWIP_IP_ACCEPT_UDP_PORT(dst_port))
#else /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) *)
/* accept DHCP client port only */
#define IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(port) ((port) == PP_NTOHS(DHCP_CLIENT_PORT))
#endif /* LWIP_DHCP && defined(LWIP_IP_ACCEPT_UDP_PORT) */
#else /* LWIP_DHCP */
#define IP_ACCEPT_LINK_LAYER_ADDRESSING 0
#endif /* LWIP_DHCP */
/**
* The interface that provided the packet for the current callback
* invocation.
@ -221,9 +245,9 @@ ip_input(struct pbuf *p, struct netif *inp)
struct netif *netif;
u16_t iphdr_hlen;
u16_t iphdr_len;
#if LWIP_DHCP
#if IP_ACCEPT_LINK_LAYER_ADDRESSING
int check_ip_src=1;
#endif /* LWIP_DHCP */
#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
IP_STATS_INC(ip.recv);
snmp_inc_ipinreceives();
@ -348,10 +372,15 @@ ip_input(struct pbuf *p, struct netif *inp)
} while(netif != NULL);
}
#if LWIP_DHCP
#if IP_ACCEPT_LINK_LAYER_ADDRESSING
/* Pass DHCP messages regardless of destination address. DHCP traffic is addressed
* using link layer addressing (such as Ethernet MAC) so we must not filter on IP.
* According to RFC 1542 section 3.1.1, referred by RFC 2131).
*
* If you want to accept private broadcast communication while a netif is down,
* define LWIP_IP_ACCEPT_UDP_PORT(dst_port), e.g.:
*
* #define LWIP_IP_ACCEPT_UDP_PORT(dst_port) ((dst_port) == PP_NTOHS(12345))
*/
if (netif == NULL) {
/* remote port is DHCP server? */
@ -359,20 +388,21 @@ ip_input(struct pbuf *p, struct netif *inp)
struct udp_hdr *udphdr = (struct udp_hdr *)((u8_t *)iphdr + iphdr_hlen);
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: UDP packet to DHCP client port %"U16_F"\n",
ntohs(udphdr->dest)));
if (udphdr->dest == PP_NTOHS(DHCP_CLIENT_PORT)) {
u16_t dst_port = udphdr->dest;
if (IP_ACCEPT_LINK_LAYER_ADDRESSED_PORT(dst_port)) {
LWIP_DEBUGF(IP_DEBUG | LWIP_DBG_TRACE, ("ip_input: DHCP packet accepted.\n"));
netif = inp;
check_ip_src = 0;
}
}
}
#endif /* LWIP_DHCP */
#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
/* broadcast or multicast packet source address? Compliant with RFC 1122: 3.2.1.3 */
#if LWIP_DHCP
#if IP_ACCEPT_LINK_LAYER_ADDRESSING
/* DHCP servers need 0.0.0.0 to be allowed as source address (RFC 1.1.2.2: 3.2.1.3/a) */
if (check_ip_src && !ip_addr_isany(&current_iphdr_src))
#endif /* LWIP_DHCP */
#endif /* IP_ACCEPT_LINK_LAYER_ADDRESSING */
{ if ((ip_addr_isbroadcast(&current_iphdr_src, inp)) ||
(ip_addr_ismulticast(&current_iphdr_src))) {
/* packet source is not valid */