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support IPv4 source based routing: define LWIP_HOOK_IP4_ROUTE_SRC to point to a routing function

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This commit is contained in:
sg 2015-08-30 21:54:39 +02:00
parent 3121b34d17
commit a01a1b4556
7 changed files with 59 additions and 15 deletions
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5
CHANGELOG
View File

@ -6,6 +6,11 @@ HISTORY
++ New features:
2015-08-30: Simon Goldschmidt
* support IPv4 source based routing: define LWIP_HOOK_IP4_ROUTE_SRC to point
to a routing function
2015-08-05: Simon Goldschmidt
* many files: allow multicast socket options IP_MULTICAST_TTL, IP_MULTICAST_IF
and IP_MULTICAST_LOOP to be used without IGMP

31
src/core/ipv4/ip4.c
View File

@ -113,6 +113,24 @@ ip4_set_default_multicast_netif(struct netif* default_multicast_netif)
}
#endif /* LWIP_MULTICAST_TX_OPTIONS */
#ifdef LWIP_HOOK_IP4_ROUTE_SRC
/**
* Source based IPv4 routing must be fully implemented in
* LWIP_HOOK_IP4_ROUTE_SRC(). This function only provides he parameters.
*/
struct netif *
ip4_route_src(const ip4_addr_t *dest, const ip4_addr_t *src)
{
if (src != NULL) {
struct netif *netif = LWIP_HOOK_IP4_ROUTE_SRC(dest, src);
if (netif != NULL) {
return netif;
}
}
return ip4_route(dest);
}
#endif /* LWIP_HOOK_IP4_ROUTE_SRC */
/**
* Finds the appropriate network interface for a given IP address. It
* searches the list of network interfaces linearly. A match is found
@ -127,7 +145,12 @@ ip4_route(const ip4_addr_t *dest)
{
struct netif *netif;
#ifdef LWIP_HOOK_IP4_ROUTE
#ifdef LWIP_HOOK_IP4_ROUTE_SRC
netif = LWIP_HOOK_IP4_ROUTE_SRC(dest, NULL);
if (netif != NULL) {
return netif;
}
#elif defined(LWIP_HOOK_IP4_ROUTE)
netif = LWIP_HOOK_IP4_ROUTE(dest);
if (netif != NULL) {
return netif;
@ -253,7 +276,7 @@ ip4_forward(struct pbuf *p, struct ip_hdr *iphdr, struct netif *inp)
}
/* Find network interface where to forward this IP packet to. */
netif = ip4_route(ip4_current_dest_addr());
netif = ip4_route_src(ip4_current_dest_addr(), ip4_current_src_addr());
if (netif == NULL) {
LWIP_DEBUGF(IP_DEBUG, ("ip_forward: no forwarding route for %"U16_F".%"U16_F".%"U16_F".%"U16_F" found\n",
ip4_addr1_16(ip4_current_dest_addr()), ip4_addr2_16(ip4_current_dest_addr()),
@ -937,7 +960,7 @@ ip4_output(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
if ((netif = ip4_route(dest)) == NULL) {
if ((netif = ip4_route_src(dest, src)) == NULL) {
LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
IP_STATS_INC(ip.rterr);
@ -975,7 +998,7 @@ ip4_output_hinted(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
LWIP_IP_CHECK_PBUF_REF_COUNT_FOR_TX(p);
if ((netif = ip4_route(dest)) == NULL) {
if ((netif = ip4_route_src(dest, src)) == NULL) {
LWIP_DEBUGF(IP_DEBUG, ("ip_output: No route to %"U16_F".%"U16_F".%"U16_F".%"U16_F"\n",
ip4_addr1_16(dest), ip4_addr2_16(dest), ip4_addr3_16(dest), ip4_addr4_16(dest)));
IP_STATS_INC(ip.rterr);

8
src/core/tcp.c
View File

@ -1788,12 +1788,12 @@ tcp_next_iss(void)
*/
u16_t
tcp_eff_send_mss_impl(u16_t sendmss, const ip_addr_t *dest
#if LWIP_IPV6
#if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING
, const ip_addr_t *src
#if LWIP_IPV4
#endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
#if LWIP_IPV6 && LWIP_IPV4
, u8_t isipv6
#endif /* LWIP_IPV4 */
#endif /* LWIP_IPV6 */
#endif /* LWIP_IPV6 && LWIP_IPV4 */
)
{
u16_t mss_s;

4
src/include/lwip/ip.h
View File

@ -262,7 +262,7 @@ extern struct ip_globals ip_data;
#define ip_route(isipv6, src, dest) \
((isipv6) ? \
ip6_route(ip_2_ip6(src), ip_2_ip6(dest)) : \
ip4_route(ip_2_ip4(dest)))
ip4_route_src(ip_2_ip4(dest), ip_2_ip4(src)))
#define ip_netif_get_local_ip(isipv6, netif, dest, storage) ((isipv6) ? \
ip6_2_ip(ip6_netif_get_local_ip(netif, ip_2_ip6(dest)), storage) : \
ip4_2_ip(ip4_netif_get_local_ip(netif), storage))
@ -278,7 +278,7 @@ err_t ip_input(struct pbuf *p, struct netif *inp);
#define ip_output_hinted(isipv6, p, src, dest, ttl, tos, proto, addr_hint) \
ip4_output_hinted(p, src, dest, ttl, tos, proto, addr_hint)
#define ip_route(isipv6, src, dest) \
ip4_route(dest)
ip4_route_src(dest, src)
#define ip_netif_get_local_ip(isipv6, netif, dest, storage) \
ip4_netif_get_local_ip(netif)
#define ip_debug_print(is_ipv6, p) ip4_debug_print(p)

11
src/include/lwip/ip4.h
View File

@ -47,6 +47,12 @@
extern "C" {
#endif
#ifdef LWIP_HOOK_IP4_ROUTE_SRC
#define LWIP_IPV4_SRC_ROUTING 1
#else
#define LWIP_IPV4_SRC_ROUTING 0
#endif
/** Currently, the function ip_output_if_opt() is only used with IGMP */
#define IP_OPTIONS_SEND (LWIP_IPV4 && LWIP_IGMP)
@ -108,6 +114,11 @@ PACK_STRUCT_END
#define ip_init() /* Compatibility define, no init needed. */
struct netif *ip4_route(const ip4_addr_t *dest);
#if LWIP_IPV4_SRC_ROUTING
struct netif *ip4_route_src(const ip4_addr_t *dest, const ip4_addr_t *src);
#else /* LWIP_IPV4_SRC_ROUTING */
#define ip4_route_src(dest, src) ip4_route(dest)
#endif /* LWIP_IPV4_SRC_ROUTING */
err_t ip4_input(struct pbuf *p, struct netif *inp);
err_t ip4_output(struct pbuf *p, const ip4_addr_t *src, const ip4_addr_t *dest,
u8_t ttl, u8_t tos, u8_t proto);

5
src/include/lwip/opt.h
View File

@ -2767,6 +2767,11 @@
* that case, ip_route() continues as normal.
*/
/**
* LWIP_HOOK_IP4_ROUTE_SRC(dest, src):
* - source-based routing for IPv4 (see LWIP_HOOK_IP4_ROUTE(), src may be NULL)
*/
/**
* LWIP_HOOK_ETHARP_GET_GW(netif, dest):
* - called from etharp_output() (IPv4)

10
src/include/lwip/tcp_impl.h
View File

@ -494,16 +494,16 @@ void tcp_trigger_input_pcb_close(void);
#if TCP_CALCULATE_EFF_SEND_MSS
u16_t tcp_eff_send_mss_impl(u16_t sendmss, const ip_addr_t *dest
#if LWIP_IPV6
#if LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING
, const ip_addr_t *src
#if LWIP_IPV4
#endif /* LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING */
#if LWIP_IPV6 && LWIP_IPV4
, u8_t isipv6
#endif /* LWIP_IPV4 */
#endif /* LWIP_IPV6 */
#endif /* LWIP_IPV6 && LWIP_IPV4 */
);
#if LWIP_IPV4 && LWIP_IPV6
#define tcp_eff_send_mss(sendmss, src, dest, isipv6) tcp_eff_send_mss_impl(sendmss, dest, src, isipv6)
#elif LWIP_IPV6
#elif LWIP_IPV6 || LWIP_IPV4_SRC_ROUTING
#define tcp_eff_send_mss(sendmss, src, dest, isipv6) tcp_eff_send_mss_impl(sendmss, dest, src)
#else /* LWIP_IPV4 && LWIP_IPV6 */
#define tcp_eff_send_mss(sendmss, src, dest, isipv6) tcp_eff_send_mss_impl(sendmss, dest)