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Use ipaddr instead of index to find the paths

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This commit is contained in:
Adrien Gallouët
2016-07-06 13:39:59 +00:00
parent bd203dd291
commit fa1586b81e
1 changed files with 69 additions and 92 deletions
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161
mud.c
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@@ -4,13 +4,6 @@
#define __APPLE_USE_RFC_3542
#endif
#ifdef DEBUG
#include <stdio.h>
#define MUD_DEBUG(...) fprintf(stderr, __VA_ARGS__);
#else
#define MUD_DEBUG(...)
#endif
#include <stdlib.h>
#include <inttypes.h>
#include <unistd.h>
@@ -85,13 +78,20 @@
#define MUD_PACKET_COUNT ((MUD_PACKET_MASK)+1)
#define MUD_PACKET_NEXT(X) (((X)+1)&(MUD_PACKET_MASK))
struct ipaddr {
int family;
union {
struct in_addr v4;
struct in6_addr v6;
} ip;
};
struct path {
struct {
unsigned up : 1;
unsigned active : 1;
} state;
unsigned index;
struct in_addr ifa_in_addr;
struct ipaddr local_addr;
struct sockaddr_storage addr;
struct {
unsigned char data[256];
@@ -331,16 +331,23 @@ int mud_cmp_addr (struct sockaddr *a, struct sockaddr *b)
}
static
struct path *mud_get_path (struct mud *mud, unsigned index, struct in_addr *ifa_in_addr, struct sockaddr *addr)
struct path *mud_get_path (struct mud *mud, struct ipaddr *local_addr, struct sockaddr *addr)
{
struct path *path;
for (path = mud->path; path; path = path->next) {
if (index) {
if (path->index != index)
if (local_addr->family != path->local_addr.family)
continue;
if (local_addr->family == AF_INET) {
if (memcmp(&path->local_addr.ip.v4,
&local_addr->ip.v4,
sizeof(local_addr->ip.v4)))
continue;
} else if (ifa_in_addr) {
if (memcmp(&path->ifa_in_addr, ifa_in_addr, sizeof(struct in_addr)))
} else {
if (memcmp(&path->local_addr.ip.v6,
&local_addr->ip.v6,
sizeof(local_addr->ip.v6)))
continue;
}
@@ -354,8 +361,7 @@ struct path *mud_get_path (struct mud *mud, unsigned index, struct in_addr *ifa_
}
static
void mud_set_path (struct path *path, unsigned index,
struct sockaddr *addr, struct sockaddr *ifa_addr)
void mud_set_path (struct path *path, struct ipaddr *local_addr, struct sockaddr *addr)
{
struct msghdr msg = {
.msg_control = path->ctrl.data,
@@ -364,25 +370,19 @@ void mud_set_path (struct path *path, unsigned index,
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&msg);
path->index = index;
memset(path->ctrl.data, 0, sizeof(path->ctrl.data));
memmove(&path->local_addr, local_addr, sizeof(struct ipaddr));
if (addr->sa_family == AF_INET) {
memmove(&path->addr, addr, sizeof(struct sockaddr_in));
memcpy(&path->ifa_in_addr,
&((struct sockaddr_in *)ifa_addr)->sin_addr,
sizeof(struct in_addr));
cmsg->cmsg_level = IPPROTO_IP;
cmsg->cmsg_type = MUD_PKTINFO;
#if defined IP_PKTINFO
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_pktinfo));
memcpy(&((struct in_pktinfo *)CMSG_DATA(cmsg))->ipi_ifindex,
&index, sizeof(index));
memcpy(&((struct in_pktinfo *)CMSG_DATA(cmsg))->ipi_spec_dst,
&((struct sockaddr_in *)ifa_addr)->sin_addr,
&local_addr->ip.v4,
sizeof(struct in_addr));
path->ctrl.size = CMSG_SPACE(sizeof(struct in_pktinfo));
@@ -390,7 +390,7 @@ void mud_set_path (struct path *path, unsigned index,
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in_addr));
memcpy(CMSG_DATA(cmsg),
&((struct sockaddr_in *)ifa_addr)->sin_addr,
&local_addr->ip.v4,
sizeof(struct in_addr));
path->ctrl.size = CMSG_SPACE(sizeof(struct in_addr));
@@ -404,11 +404,8 @@ void mud_set_path (struct path *path, unsigned index,
cmsg->cmsg_type = IPV6_PKTINFO;
cmsg->cmsg_len = CMSG_LEN(sizeof(struct in6_pktinfo));
memcpy(&((struct in6_pktinfo *)CMSG_DATA(cmsg))->ipi6_ifindex,
&index, sizeof(index));
memcpy(&((struct in6_pktinfo *)CMSG_DATA(cmsg))->ipi6_addr,
&((struct sockaddr_in6 *)ifa_addr)->sin6_addr,
&local_addr->ip.v6,
sizeof(struct in6_addr));
path->ctrl.size = CMSG_SPACE(sizeof(struct in6_pktinfo));
@@ -416,41 +413,12 @@ void mud_set_path (struct path *path, unsigned index,
}
static
void mud_reset_path (struct path *path, unsigned index, struct sockaddr *addr)
struct path *mud_new_path (struct mud *mud, struct ipaddr *local_addr, struct sockaddr *addr)
{
char name[IF_NAMESIZE];
if (local_addr->family != addr->sa_family)
return NULL;
if (if_indextoname(index, name) != name)
return;
struct ifaddrs *ifaddrs = NULL;
if ((getifaddrs(&ifaddrs) == -1) || !ifaddrs)
return;
for (struct ifaddrs *ifa = ifaddrs; ifa; ifa = ifa->ifa_next) {
struct sockaddr *ifa_addr = ifa->ifa_addr;
if (!ifa_addr)
continue;
if (ifa_addr->sa_family != addr->sa_family)
continue;
if (strncmp(name, ifa->ifa_name, sizeof(name)))
continue;
mud_set_path(path, index, addr, ifa_addr);
break;
}
freeifaddrs(ifaddrs);
}
static
struct path *mud_new_path (struct mud *mud, unsigned index, struct sockaddr *addr)
{
struct path *path = mud_get_path(mud, index, NULL, addr);
struct path *path = mud_get_path(mud, local_addr, addr);
if (path)
return path;
@@ -460,12 +428,7 @@ struct path *mud_new_path (struct mud *mud, unsigned index, struct sockaddr *add
if (!path)
return NULL;
mud_reset_path(path, index, addr);
if (!path->index) {
free(path);
return NULL;
}
mud_set_path(path, local_addr, addr);
path->next = mud->path;
mud->path = path;
@@ -473,6 +436,27 @@ struct path *mud_new_path (struct mud *mud, unsigned index, struct sockaddr *add
return path;
}
static
int mud_ipaddrinfo (struct ipaddr *ipaddr, const char *name)
{
if (!name) {
errno = EINVAL;
return -1;
}
if (inet_pton(AF_INET, name, &ipaddr->ip.v4) == 1) {
ipaddr->family = AF_INET;
return 0;
}
if (inet_pton(AF_INET6, name, &ipaddr->ip.v6) == 1) {
ipaddr->family = AF_INET6;
return 0;
}
return -1;
}
int mud_peer (struct mud *mud, const char *name, const char *host, int port)
{
if (!name || !host || !port) {
@@ -480,16 +464,9 @@ int mud_peer (struct mud *mud, const char *name, const char *host, int port)
return -1;
}
const size_t len = strlen(name);
struct ipaddr local_addr;
if (len >= IF_NAMESIZE) {
errno = EINVAL;
return -1;
}
unsigned index = if_nametoindex(name);
if (!index)
if (mud_ipaddrinfo(&local_addr, name))
return -1;
struct sockaddr_storage addr;
@@ -499,7 +476,7 @@ int mud_peer (struct mud *mud, const char *name, const char *host, int port)
mud_unmapv4((struct sockaddr *)&addr);
struct path *path = mud_new_path(mud, index, (struct sockaddr *)&addr);
struct path *path = mud_new_path(mud, &local_addr, (struct sockaddr *)&addr);
if (!path)
return -1;
@@ -964,34 +941,35 @@ int mud_pull (struct mud *mud)
if (!cmsg)
continue;
unsigned index = 0;
struct in_addr ifa_in_addr;
struct ipaddr local_addr;
if (cmsg->cmsg_level == IPPROTO_IP) {
local_addr.family = AF_INET;
#if defined IP_PKTINFO
memcpy(&index,
&((struct in_pktinfo *)CMSG_DATA(cmsg))->ipi_ifindex,
sizeof(index));
memcpy(&local_addr.ip.v4,
&((struct in_pktinfo *)CMSG_DATA(cmsg))->ipi_addr,
sizeof(local_addr.ip.v4));
#elif defined IP_RECVDSTADDR
memcpy(&ifa_in_addr,
memcpy(&local_addr.ip.v4,
(struct in_addr *)CMSG_DATA(cmsg),
sizeof(struct in_addr));
sizeof(local_addr.ip.v4));
#endif
}
if (cmsg->cmsg_level == IPPROTO_IPV6) {
memcpy(&index,
&((struct in6_pktinfo *)CMSG_DATA(cmsg))->ipi6_ifindex,
sizeof(index));
local_addr.family = AF_INET6;
memcpy(&local_addr.ip.v6,
&((struct in6_pktinfo *)CMSG_DATA(cmsg))->ipi6_addr,
sizeof(local_addr.ip.v6));
}
struct path *path = mud_get_path(mud, index, &ifa_in_addr, (struct sockaddr *)&addr);
struct path *path = mud_get_path(mud, &local_addr, (struct sockaddr *)&addr);
if (!path) {
if (ret != (ssize_t)MUD_PACKET_MIN_SIZE)
continue;
path = mud_new_path(mud, index, (struct sockaddr *)&addr);
path = mud_new_path(mud, &local_addr, (struct sockaddr *)&addr);
if (!path)
return -1;
@@ -1095,7 +1073,6 @@ int mud_push (struct mud *mud)
(now-path->send_time) < mud->send_timeout)
continue;
mud_reset_path(path, path->index, (struct sockaddr *)&path->addr);
mud_ping_path(mud, path, now);
}