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raw: add core support for multicast TX options

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The patch simply copies the relevant bits from the UDP implementation.
Perhaps most notably, the patch does *not* copy the IPv4-only UDP
support for IP_MULTICAST_IF, because that option can also be
implemented using the interface index based approach. Largely thanks
to this omission, at least on 32-bit platforms, this patch does not
increase the RAW PCB size at all.
This commit is contained in:
David van Moolenbroek
2017-02-06 17:10:45 +00:00
committed by Dirk Ziegelmeier
parent ab8119360e
commit 6ce9a01c3e
4 changed files with 64 additions and 13 deletions
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2
src/include/lwip/opt.h
View File

@@ -986,7 +986,7 @@
* core support for the corresponding IPv6 options.
*/
#if !defined LWIP_MULTICAST_TX_OPTIONS || defined __DOXYGEN__
#define LWIP_MULTICAST_TX_OPTIONS ((LWIP_IGMP || LWIP_IPV6_MLD) && LWIP_UDP)
#define LWIP_MULTICAST_TX_OPTIONS ((LWIP_IGMP || LWIP_IPV6_MLD) && (LWIP_UDP || LWIP_RAW))
#endif
/**
* @}

19
src/include/lwip/raw.h
View File

@@ -52,8 +52,9 @@
extern "C" {
#endif
#define RAW_FLAGS_CONNECTED 0x01U
#define RAW_FLAGS_HDRINCL 0x02U
#define RAW_FLAGS_CONNECTED 0x01U
#define RAW_FLAGS_HDRINCL 0x02U
#define RAW_FLAGS_MULTICAST_LOOP 0x04U
struct raw_pcb;
@@ -80,6 +81,13 @@ struct raw_pcb {
u8_t protocol;
u8_t flags;
#if LWIP_MULTICAST_TX_OPTIONS
/** outgoing network interface for multicast packets, by interface index (if nonzero) */
u8_t mcast_ifindex;
/** TTL for outgoing multicast packets */
u8_t mcast_ttl;
#endif /* LWIP_MULTICAST_TX_OPTIONS */
/** receive callback function */
raw_recv_fn recv;
/* user-supplied argument for the recv callback */
@@ -118,6 +126,13 @@ void raw_netif_ip_addr_changed(const ip_addr_t* old_addr, const ip_addr_t* new_a
/* for compatibility with older implementation */
#define raw_new_ip6(proto) raw_new_ip_type(IPADDR_TYPE_V6, proto)
#if LWIP_MULTICAST_TX_OPTIONS
#define raw_set_multicast_netif_index(pcb, idx) ((pcb)->mcast_ifindex = (idx))
#define raw_get_multicast_netif_index(pcb) ((pcb)->mcast_ifindex)
#define raw_set_multicast_ttl(pcb, value) ((pcb)->mcast_ttl = (value))
#define raw_get_multicast_ttl(pcb) ((pcb)->mcast_ttl)
#endif /* LWIP_MULTICAST_TX_OPTIONS */
#ifdef __cplusplus
}
#endif