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-rw-r--r--src/ipcpd/broadcast/dt.c2
-rw-r--r--src/ipcpd/broadcast/main.c2
-rw-r--r--src/ipcpd/config.h.in6
-rw-r--r--src/ipcpd/eth/eth.c6
-rw-r--r--src/ipcpd/ipcp.c3
-rw-r--r--src/ipcpd/ipcp.h1
-rw-r--r--src/ipcpd/local/main.c9
-rw-r--r--src/ipcpd/udp/udp.c57
-rw-r--r--src/ipcpd/unicast/fa.c6
9 files changed, 79 insertions, 13 deletions
diff --git a/src/ipcpd/broadcast/dt.c b/src/ipcpd/broadcast/dt.c
index 30e89a4f..95483e33 100644
--- a/src/ipcpd/broadcast/dt.c
+++ b/src/ipcpd/broadcast/dt.c
@@ -28,7 +28,7 @@
#include "config.h"
-#define BROADCAST_MTU 1400 /* FIXME: avoid packet copy. */
+#define BROADCAST_MTU IPCP_BROADCAST_MTU /* FIXME: avoid packet copy. */
#define DT "dt"
#define OUROBOROS_PREFIX DT
diff --git a/src/ipcpd/broadcast/main.c b/src/ipcpd/broadcast/main.c
index b3cbdc79..77e22531 100644
--- a/src/ipcpd/broadcast/main.c
+++ b/src/ipcpd/broadcast/main.c
@@ -242,7 +242,7 @@ static int broadcast_ipcp_join(int fd,
notifier_event(NOTIFY_DT_CONN_ADD, &conn);
- ipcp_flow_alloc_reply(fd, 0, mpl, &data);
+ ipcp_flow_alloc_reply(fd, 0, mpl, IPCP_BROADCAST_MTU, &data);
return 0;
}
diff --git a/src/ipcpd/config.h.in b/src/ipcpd/config.h.in
index 37ee2c5e..a719fa3b 100644
--- a/src/ipcpd/config.h.in
+++ b/src/ipcpd/config.h.in
@@ -46,6 +46,7 @@
#define IPCP_SCHED_THR_MUL @IPCP_SCHED_THR_MUL@
#define PFT_SIZE @PFT_SIZE@
#define IPCP_UNICAST_MPL @IPCP_UNICAST_MPL@
+#define IPCP_UNICAST_MTU @IPCP_UNICAST_MTU@
#define CONNMGR_RCV_TIMEOUT @CONNMGR_RCV_TIMEOUT@
#cmakedefine DISABLE_CORE_LOCK
@@ -66,6 +67,8 @@
#define IPCP_UDP_RD_THR @IPCP_UDP_RD_THR@
#define IPCP_UDP_WR_THR @IPCP_UDP_WR_THR@
#define IPCP_UDP_MPL @IPCP_UDP_MPL@
+#define IPCP_UDP4_MTU @IPCP_UDP4_MTU@
+#define IPCP_UDP6_MTU @IPCP_UDP6_MTU@
/* eth */
#cmakedefine HAVE_NETMAP
@@ -80,7 +83,8 @@
/* local */
#define IPCP_LOCAL_MPL @IPCP_LOCAL_MPL@
+#define IPCP_LOCAL_MTU @IPCP_LOCAL_MTU@
/* broadcast */
-/* local */
#define IPCP_BROADCAST_MPL @IPCP_BROADCAST_MPL@
+#define IPCP_BROADCAST_MTU @IPCP_BROADCAST_MTU@
diff --git a/src/ipcpd/eth/eth.c b/src/ipcpd/eth/eth.c
index 10a8b338..1dc2b8fe 100644
--- a/src/ipcpd/eth/eth.c
+++ b/src/ipcpd/eth/eth.c
@@ -841,7 +841,8 @@ static int eth_ipcp_req(uint8_t * r_addr,
{
int fd;
- fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_ETH_MPL, data);
+ fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_ETH_MPL,
+ ETH_MAX_PACKET_SIZE, data);
if (fd < 0) {
log_err("Could not get new flow from IRMd.");
return -1;
@@ -913,7 +914,8 @@ static int eth_ipcp_alloc_reply(uint8_t * r_addr,
#elif defined(BUILD_ETH_LLC)
log_dbg("Flow reply, fd %d, SSAP %d, DSAP %d.", fd, ssap, dsap);
#endif
- if ((ret = ipcp_flow_alloc_reply(fd, response, mpl, data)) < 0) {
+ if ((ret = ipcp_flow_alloc_reply(fd, response, mpl,
+ ETH_MAX_PACKET_SIZE, data)) < 0) {
log_err("Failed to reply to flow allocation.");
return -1;
}
diff --git a/src/ipcpd/ipcp.c b/src/ipcpd/ipcp.c
index 5ad2401f..1052a686 100644
--- a/src/ipcpd/ipcp.c
+++ b/src/ipcpd/ipcp.c
@@ -363,6 +363,7 @@ static void * acceptloop(void * o)
int ipcp_wait_flow_req_arr(const uint8_t * dst,
qosspec_t qs,
time_t mpl,
+ uint32_t mtu,
const buffer_t * data)
{
struct timespec ts = TIMESPEC_INIT_MS(ALLOC_TIMEOUT);
@@ -392,7 +393,7 @@ int ipcp_wait_flow_req_arr(const uint8_t * dst,
assert(ipcpd.alloc_id == -1);
- fd = ipcp_flow_req_arr(&hash, qs, mpl, data);
+ fd = ipcp_flow_req_arr(&hash, qs, mpl, mtu, data);
if (fd < 0) {
pthread_mutex_unlock(&ipcpd.alloc_lock);
log_err("Failed to get fd for flow.");
diff --git a/src/ipcpd/ipcp.h b/src/ipcpd/ipcp.h
index 26a780a3..0adcc694 100644
--- a/src/ipcpd/ipcp.h
+++ b/src/ipcpd/ipcp.h
@@ -98,6 +98,7 @@ enum ipcp_state ipcp_get_state(void);
int ipcp_wait_flow_req_arr(const uint8_t * dst,
qosspec_t qs,
time_t mpl,
+ uint32_t mtu,
const buffer_t * data);
int ipcp_wait_flow_resp(const int fd);
diff --git a/src/ipcpd/local/main.c b/src/ipcpd/local/main.c
index 2c867317..eb9836f2 100644
--- a/src/ipcpd/local/main.c
+++ b/src/ipcpd/local/main.c
@@ -203,7 +203,8 @@ static int local_ipcp_flow_alloc(int fd,
HASH_VAL32(dst), fd);
assert(dst);
- out_fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_LOCAL_MPL, data);
+ out_fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_LOCAL_MPL,
+ IPCP_LOCAL_MTU, data);
if (out_fd < 0) {
log_dbg("Flow allocation failed: %d", out_fd);
return -1;
@@ -255,14 +256,16 @@ static int local_ipcp_flow_alloc_resp(int fd,
}
if (response < 0) {
- ipcp_flow_alloc_reply(out_fd, response, mpl, data);
+ ipcp_flow_alloc_reply(out_fd, response, mpl,
+ IPCP_LOCAL_MTU, data);
log_info("Flow allocation rejected, fds (%d, %d).", out_fd, fd);
return 0;
}
fset_add(local_data.flows, fd);
- if (ipcp_flow_alloc_reply(out_fd, response, mpl, data) < 0) {
+ if (ipcp_flow_alloc_reply(out_fd, response, mpl,
+ IPCP_LOCAL_MTU, data) < 0) {
log_err("Failed to reply to allocation");
fset_del(local_data.flows, fd);
return -1;
diff --git a/src/ipcpd/udp/udp.c b/src/ipcpd/udp/udp.c
index 168ea718..8fba5a77 100644
--- a/src/ipcpd/udp/udp.c
+++ b/src/ipcpd/udp/udp.c
@@ -47,6 +47,10 @@
#include <stdlib.h>
#include <sys/wait.h>
#include <fcntl.h>
+#include <unistd.h>
+#if defined(__linux__)
+#include <netinet/ip.h>
+#endif
#define FLOW_REQ 1
#define FLOW_REPLY 2
@@ -130,6 +134,53 @@ static const char * __inet_ntop(const struct __ADDR * addr,
return inet_ntop(__AF, addr, buf, __ADDRSTRLEN);
}
+#if defined(BUILD_IPCP_UDP4)
+#define UDP_MTU_FALLBACK IPCP_UDP4_MTU
+#define UDP_IP_OVERHEAD 28U /* IPv4 + UDP */
+#else
+#define UDP_MTU_FALLBACK IPCP_UDP6_MTU
+#define UDP_IP_OVERHEAD 48U /* IPv6 + UDP */
+#endif
+
+static uint32_t udp_query_mtu(const struct __SOCKADDR * saddr)
+{
+#if defined(__linux__) && (defined(IP_MTU) || defined(IPV6_MTU))
+ int sock;
+ int mtu = 0;
+ socklen_t len = sizeof(mtu);
+
+ sock = socket(__AF, SOCK_DGRAM, IPPROTO_UDP);
+ if (sock < 0)
+ return UDP_MTU_FALLBACK;
+
+ if (connect(sock, (const struct sockaddr *) saddr,
+ sizeof(*saddr)) < 0)
+ goto fallback;
+
+#if defined(BUILD_IPCP_UDP4) && defined(IP_MTU)
+ if (getsockopt(sock, IPPROTO_IP, IP_MTU, &mtu, &len) < 0)
+ goto fallback;
+#elif defined(BUILD_IPCP_UDP6) && defined(IPV6_MTU)
+ if (getsockopt(sock, IPPROTO_IPV6, IPV6_MTU, &mtu, &len) < 0)
+ goto fallback;
+#else
+ goto fallback;
+#endif
+ close(sock);
+
+ if (mtu <= (int) UDP_IP_OVERHEAD)
+ return UDP_MTU_FALLBACK;
+
+ return (uint32_t) mtu - UDP_IP_OVERHEAD;
+
+ fallback:
+ close(sock);
+#else
+ (void) saddr;
+#endif
+ return UDP_MTU_FALLBACK;
+}
+
static int udp_data_init(void)
{
int i;
@@ -285,7 +336,8 @@ static int udp_ipcp_port_req(struct __SOCKADDR * c_saddr,
{
int fd;
- fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_UDP_MPL, data);
+ fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_UDP_MPL,
+ udp_query_mtu(c_saddr), data);
if (fd < 0) {
log_err("Could not get new flow from IRMd.");
return -1;
@@ -332,7 +384,8 @@ static int udp_ipcp_port_alloc_reply(const struct __SOCKADDR * saddr,
pthread_rwlock_unlock(&udp_data.flows_lock);
- if (ipcp_flow_alloc_reply(s_eid, response, mpl, data) < 0) {
+ if (ipcp_flow_alloc_reply(s_eid, response, mpl,
+ udp_query_mtu(saddr), data) < 0) {
log_err("Failed to reply to flow allocation.");
return -1;
}
diff --git a/src/ipcpd/unicast/fa.c b/src/ipcpd/unicast/fa.c
index 39928ab2..ca27108e 100644
--- a/src/ipcpd/unicast/fa.c
+++ b/src/ipcpd/unicast/fa.c
@@ -500,7 +500,8 @@ static int fa_handle_flow_req(struct fa_msg * msg,
qs.max_gap = ntoh32(msg->max_gap);
qs.timeout = ntoh32(msg->timeout);
- fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_UNICAST_MPL, &data);
+ fd = ipcp_wait_flow_req_arr(dst, qs, IPCP_UNICAST_MPL,
+ IPCP_UNICAST_MTU, &data);
if (fd < 0)
return fd;
@@ -559,7 +560,8 @@ static int fa_handle_flow_reply(struct fa_msg * msg,
pthread_rwlock_unlock(&fa.flows_lock);
- if (ipcp_flow_alloc_reply(fd, response, mpl, &data) < 0) {
+ if (ipcp_flow_alloc_reply(fd, response, mpl,
+ IPCP_UNICAST_MTU, &data) < 0) {
log_err("Failed to reply for flow allocation on fd %d.", fd);
return -EIRMD;
}
generated by cgit v1.2.3 (git 2.39.1) at 2026-05-24 23:44:11 +0000