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Add a sockaddr dst argument to send_ip function that use raw sockets.

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Heretofore we have always extracted teh destination address directly
from the packet contents. But the raw packet bytes do not contain enough
information in one case: IPv6 link-local addresses. For those we really
need the scope ID, and for that we must pass this information all the
way down.

Before this, I got "no route to host" on OS link-local addresses. I
think that it was working on Linux only on accident, by the OS picking a
default interface or something.
This commit is contained in:
david
2011-09-19 16:13:35 +00:00
parent d91b131da0
commit f41753c4e9
8 changed files with 93 additions and 85 deletions
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13
libnetutil/netutil.h
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@@ -435,7 +435,7 @@ int route_dst(const struct sockaddr_storage * const dst, struct route_nfo *rnfo,
const char *device, const struct sockaddr_storage *spoofss);
/* Send an IP packet over a raw socket. */
int send_ip_packet_sd(int sd, const u8 *packet, unsigned int packetlen);
int send_ip_packet_sd(int sd, const struct sockaddr_in *dst, const u8 *packet, unsigned int packetlen);
/* Send an IP packet over an ethernet handle. */
int send_ip_packet_eth(const struct eth_nfo *eth, const u8 *packet, unsigned int packetlen);
@@ -443,16 +443,19 @@ int send_ip_packet_eth(const struct eth_nfo *eth, const u8 *packet, unsigned int
/* Sends the supplied pre-built IPv4 packet. The packet is sent through
* the raw socket "sd" if "eth" is NULL. Otherwise, it gets sent at raw
* ethernet level. */
int send_ip_packet_eth_or_sd(int sd, const struct eth_nfo *eth, const u8 *packet, unsigned int packetlen);
int send_ip_packet_eth_or_sd(int sd, const struct eth_nfo *eth,
const struct sockaddr_in *dst, const u8 *packet, unsigned int packetlen);
/* Sends an IPv4 packet. */
int send_ipv6_packet_eth_or_sd(int sd, const struct eth_nfo *eth, const u8 *packet, unsigned int len);
int send_ipv6_packet_eth_or_sd(int sd, const struct eth_nfo *eth,
const struct sockaddr_in6 *dst, const u8 *packet, unsigned int packetlen);
/* Create and send all fragments of a pre-built IPv4 packet.
* Minimal MTU for IPv4 is 68 and maximal IPv4 header size is 60
* which gives us a right to cut TCP header after 8th byte */
int send_frag_ip_packet(int sd, const struct eth_nfo *eth, const u8 *packet,
unsigned int packetlen, u32 mtu);
int send_frag_ip_packet(int sd, const struct eth_nfo *eth,
const struct sockaddr_in *dst,
const u8 *packet, unsigned int packetlen, u32 mtu);
/* Wrapper for system function sendto(), which retries a few times when
* the call fails. It also prints informational messages about the