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-rw-r--r--src/config.c4
-rw-r--r--src/config.y10
-rw-r--r--src/fastd.h8
-rw-r--r--src/handshake.c46
-rw-r--r--src/handshake.h3
-rw-r--r--src/iface.c61
-rw-r--r--src/peer.h11
-rw-r--r--src/protocols/ec25519_fhmqvc/handshake.c7
-rw-r--r--src/receive.c2
-rw-r--r--src/shell.c15
10 files changed, 104 insertions, 63 deletions
diff --git a/src/config.c b/src/config.c
index 9ab2f88..4b9aeec 100644
--- a/src/config.c
+++ b/src/config.c
@@ -609,6 +609,7 @@ static void peer_dirs_read_peer_group(fastd_peer_group_t *group) {
/** Initializes the configured peers */
static void configure_peers(bool dirs_only) {
ctx.has_floating = false;
+ ctx.max_mtu = conf.mtu;
ssize_t i;
for (i = VECTOR_LEN(ctx.peers)-1; i >= 0; i--) {
@@ -634,6 +635,9 @@ static void configure_peers(bool dirs_only) {
if (fastd_peer_is_floating(peer))
ctx.has_floating = true;
+ if (conf.mode != MODE_TAP && peer->mtu > ctx.max_mtu)
+ ctx.max_mtu = peer->mtu;
+
peer->config_state = CONFIG_STATIC;
if (!fastd_peer_is_established(peer)) {
diff --git a/src/config.y b/src/config.y
index e2bcb24..3cffa17 100644
--- a/src/config.y
+++ b/src/config.y
@@ -478,6 +478,7 @@ peer_statement: TOK_REMOTE peer_remote ';'
| TOK_FLOAT peer_float ';'
| TOK_KEY peer_key ';'
| TOK_INTERFACE peer_interface ';'
+ | TOK_MTU peer_mtu ';'
| TOK_INCLUDE peer_include ';'
;
@@ -550,6 +551,15 @@ peer_interface: TOK_STRING {
}
;
+peer_mtu: TOK_UINT {
+ if ($1 < 576 || $1 > 65535) {
+ fastd_config_error(&@$, state, "invalid MTU");
+ YYERROR;
+ }
+
+ state->peer->mtu = $1;
+ }
+ ;
peer_include: TOK_STRING {
if (!fastd_config_read($1->str, state->peer_group, state->peer, state->depth))
YYERROR;
diff --git a/src/fastd.h b/src/fastd.h
index fa29bf0..ee48a65 100644
--- a/src/fastd.h
+++ b/src/fastd.h
@@ -159,6 +159,7 @@ struct fastd_iface {
fastd_poll_fd_t fd; /**< The file descriptor of the tunnel interface */
char *name; /**< The interface name */
fastd_peer_t *peer; /**< The peer associated with the interface (if any) */
+ uint16_t mtu;
};
@@ -301,6 +302,7 @@ struct fastd_context {
#endif
bool has_floating; /**< Specifies if any of the configured peers have floating remotes */
+ uint16_t max_mtu; /**< The maximum MTU of all peer-specific interfaces */
uint32_t peer_addr_ht_seed; /**< The hash seed used for peer_addr_ht */
size_t peer_addr_ht_size; /**< The number of hash buckets in the peer address hashtable */
@@ -416,13 +418,13 @@ static inline void fastd_setnonblock(int fd) {
/** Returns the maximum payload size \em fastd is configured to transport */
-static inline size_t fastd_max_payload(void) {
+static inline size_t fastd_max_payload(uint16_t mtu) {
switch (conf.mode) {
case MODE_TAP:
case MODE_MULTITAP:
- return conf.mtu+ETH_HLEN;
+ return mtu+ETH_HLEN;
case MODE_TUN:
- return conf.mtu;
+ return mtu;
default:
exit_bug("invalid mode");
}
diff --git a/src/handshake.c b/src/handshake.c
index 726c117..000d685 100644
--- a/src/handshake.c
+++ b/src/handshake.c
@@ -176,7 +176,7 @@ static fastd_string_stack_t * parse_string_list(const uint8_t *data, size_t len)
}
/** Allocates and initializes a new handshake packet */
-static fastd_handshake_buffer_t new_handshake(uint8_t type, bool little_endian, const fastd_method_info_t *method, const fastd_string_stack_t *methods, size_t tail_space) {
+static fastd_handshake_buffer_t new_handshake(uint8_t type, bool little_endian, uint16_t mtu, const fastd_method_info_t *method, const fastd_string_stack_t *methods, size_t tail_space) {
size_t version_len = strlen(FASTD_VERSION);
size_t protocol_len = strlen(conf.protocol->name);
size_t method_len = method ? strlen(method->name) : 0;
@@ -190,7 +190,7 @@ static fastd_handshake_buffer_t new_handshake(uint8_t type, bool little_endian,
fastd_handshake_buffer_t buffer = {
.buffer = fastd_buffer_alloc(sizeof(fastd_handshake_packet_t), 1,
3*5 + /* handshake type, mode, reply code */
- 6 + /* MTU */
+ (mtu ? 6 : 0) + /* MTU */
4+version_len + /* version name */
4+protocol_len + /* protocol name */
4+method_len + /* method name */
@@ -204,7 +204,9 @@ static fastd_handshake_buffer_t new_handshake(uint8_t type, bool little_endian,
fastd_handshake_add_uint8(&buffer, RECORD_HANDSHAKE_TYPE, type);
fastd_handshake_add_uint8(&buffer, RECORD_MODE, get_mode_id());
- fastd_handshake_add_uint16_endian(&buffer, RECORD_MTU, conf.mtu);
+
+ if (mtu)
+ fastd_handshake_add_uint16_endian(&buffer, RECORD_MTU, mtu);
fastd_handshake_add(&buffer, RECORD_VERSION_NAME, version_len, FASTD_VERSION);
fastd_handshake_add(&buffer, RECORD_PROTOCOL_NAME, protocol_len, conf.protocol->name);
@@ -222,18 +224,18 @@ static fastd_handshake_buffer_t new_handshake(uint8_t type, bool little_endian,
/** Allocates and initializes a new initial handshake packet */
fastd_handshake_buffer_t fastd_handshake_new_init(size_t tail_space) {
- return new_handshake(1, true, NULL, conf.secure_handshakes ? NULL : conf.peer_group->methods, tail_space);
+ return new_handshake(1, true, 0, NULL, conf.secure_handshakes ? NULL : conf.peer_group->methods, tail_space);
}
/** Allocates and initializes a new reply handshake packet */
-fastd_handshake_buffer_t fastd_handshake_new_reply(uint8_t type, bool little_endian, const fastd_method_info_t *method, const fastd_string_stack_t *methods, size_t tail_space) {
- fastd_handshake_buffer_t buffer = new_handshake(type, little_endian, method, methods, tail_space);
+fastd_handshake_buffer_t fastd_handshake_new_reply(uint8_t type, bool little_endian, uint16_t mtu, const fastd_method_info_t *method, const fastd_string_stack_t *methods, size_t tail_space) {
+ fastd_handshake_buffer_t buffer = new_handshake(type, little_endian, mtu, method, methods, tail_space);
fastd_handshake_add_uint8(&buffer, RECORD_REPLY_CODE, 0);
return buffer;
}
/** Prints the error corresponding to the given reply code and error detail */
-static void print_error(const char *prefix, const fastd_peer_address_t *remote_addr, uint8_t reply_code, uint16_t error_detail) {
+static void print_error(const char *prefix, const fastd_peer_t *peer, const fastd_peer_address_t *remote_addr, uint8_t reply_code, uint16_t error_detail) {
const char *error_field_str;
if (error_detail >= RECORD_MAX)
@@ -260,7 +262,7 @@ static void print_error(const char *prefix, const fastd_peer_address_t *remote_a
break;
case RECORD_MTU:
- pr_warn("Handshake with %I failed: %s error: MTU configuration differs with peer (local MTU is %u)", remote_addr, prefix, conf.mtu);
+ pr_warn("Handshake with %I failed: %s error: MTU configuration differs with peer (local MTU is %u)", remote_addr, prefix, fastd_peer_get_mtu(peer));
break;
case RECORD_METHOD_NAME:
@@ -281,7 +283,7 @@ static void print_error(const char *prefix, const fastd_peer_address_t *remote_a
/** Sends an error reply to a peer */
void fastd_handshake_send_error(fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_peer_t *peer, const fastd_handshake_t *handshake, uint8_t reply_code, uint16_t error_detail) {
- print_error("sending", remote_addr, reply_code, error_detail);
+ print_error("sending", peer, remote_addr, reply_code, error_detail);
fastd_handshake_buffer_t buffer = {
.buffer = fastd_buffer_alloc(sizeof(fastd_handshake_packet_t), 0, 3*5 /* enough space for handshake type, reply code and error detail */),
@@ -355,14 +357,14 @@ static inline fastd_handshake_t parse_tlvs(const fastd_buffer_t *buffer) {
}
/** Prints the error found in a received handshake */
-static inline void print_error_reply(const fastd_peer_address_t *remote_addr, const fastd_handshake_t *handshake) {
+static inline void print_error_reply(const fastd_peer_t *peer, const fastd_peer_address_t *remote_addr, const fastd_handshake_t *handshake) {
uint8_t reply_code = as_uint8(&handshake->records[RECORD_REPLY_CODE]);
uint16_t error_detail = RECORD_MAX;
if (handshake->records[RECORD_ERROR_DETAIL].length == 1 || handshake->records[RECORD_ERROR_DETAIL].length == 2)
error_detail = as_uint(&handshake->records[RECORD_ERROR_DETAIL]);
- print_error("received", remote_addr, reply_code, error_detail);
+ print_error("received", peer, remote_addr, reply_code, error_detail);
}
/** Does some basic validity checks on a received handshake */
@@ -381,15 +383,6 @@ static inline bool check_records(fastd_socket_t *sock, const fastd_peer_address_
}
}
- if (!conf.secure_handshakes || handshake->type > 1) {
- if (handshake->records[RECORD_MTU].length == 2) {
- if (as_uint16_endian(&handshake->records[RECORD_MTU], handshake->little_endian) != conf.mtu) {
- fastd_handshake_send_error(sock, local_addr, remote_addr, peer, handshake, REPLY_UNACCEPTABLE_VALUE, RECORD_MTU);
- return false;
- }
- }
- }
-
if (handshake->type > 1) {
if (handshake->records[RECORD_REPLY_CODE].length != 1) {
pr_warn("received handshake reply without reply code from %I", remote_addr);
@@ -397,7 +390,18 @@ static inline bool check_records(fastd_socket_t *sock, const fastd_peer_address_
}
if (as_uint8(&handshake->records[RECORD_REPLY_CODE]) != REPLY_SUCCESS) {
- print_error_reply(remote_addr, handshake);
+ print_error_reply(peer, remote_addr, handshake);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+bool fastd_handshake_check_mtu(fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_peer_t *peer, const fastd_handshake_t *handshake) {
+ if (handshake->records[RECORD_MTU].length == 2) {
+ if (as_uint16_endian(&handshake->records[RECORD_MTU], handshake->little_endian) != fastd_peer_get_mtu(peer)) {
+ fastd_handshake_send_error(sock, local_addr, remote_addr, peer, handshake, REPLY_UNACCEPTABLE_VALUE, RECORD_MTU);
return false;
}
}
diff --git a/src/handshake.h b/src/handshake.h
index ccd1da5..997f955 100644
--- a/src/handshake.h
+++ b/src/handshake.h
@@ -100,9 +100,10 @@ struct fastd_handshake_buffer {
fastd_handshake_buffer_t fastd_handshake_new_init(size_t tail_space);
-fastd_handshake_buffer_t fastd_handshake_new_reply(uint8_t type, bool little_endian, const fastd_method_info_t *method, const fastd_string_stack_t *methods, size_t tail_space);
+fastd_handshake_buffer_t fastd_handshake_new_reply(uint8_t type, bool little_endian, uint16_t mtu, const fastd_method_info_t *method, const fastd_string_stack_t *methods, size_t tail_space);
void fastd_handshake_send_error(fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_peer_t *peer, const fastd_handshake_t *handshake, uint8_t reply_code, uint16_t error_detail);
+bool fastd_handshake_check_mtu(fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_peer_t *peer, const fastd_handshake_t *handshake);
const fastd_method_info_t * fastd_handshake_get_method(const fastd_peer_t *peer, const fastd_handshake_t *handshake);
void fastd_handshake_handle(fastd_socket_t *sock, const fastd_peer_address_t *local_addr, const fastd_peer_address_t *remote_addr, fastd_peer_t *peer, fastd_buffer_t buffer);
diff --git a/src/iface.c b/src/iface.c
index e471c89..4010c16 100644
--- a/src/iface.c
+++ b/src/iface.c
@@ -87,13 +87,13 @@ static inline fastd_iface_type_t get_iface_type(void) {
}
}
-static void open_iface(fastd_iface_t *iface, const char *ifname);
+static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu);
#ifdef __linux__
/** Opens the TUN/TAP device helper shared by Android and Linux targets */
-static void open_iface_linux(fastd_iface_t *iface, const char *ifname, const char *dev_name) {
+static void open_iface_linux(fastd_iface_t *iface, const char *ifname, uint16_t mtu, const char *dev_name) {
int ctl_sock = -1;
struct ifreq ifr = {};
@@ -132,8 +132,8 @@ static void open_iface_linux(fastd_iface_t *iface, const char *ifname, const cha
if (ioctl(ctl_sock, SIOCGIFMTU, &ifr) < 0)
exit_errno("SIOCGIFMTU ioctl failed");
- if (ifr.ifr_mtu != conf.mtu) {
- ifr.ifr_mtu = conf.mtu;
+ if (ifr.ifr_mtu != mtu) {
+ ifr.ifr_mtu = mtu;
if (ioctl(ctl_sock, SIOCSIFMTU, &ifr) < 0) {
pr_error_errno("unable to set TUN/TAP interface MTU: SIOCSIFMTU ioctl failed");
goto error;
@@ -160,7 +160,7 @@ static void open_iface_linux(fastd_iface_t *iface, const char *ifname, const cha
#if defined(__ANDROID__)
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname) {
+static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
if (conf.android_integration) {
if (get_iface_type() != IFACE_TYPE_TUN)
exit_bug("Non-TUN iface type with Android integration");
@@ -172,27 +172,27 @@ static void open_iface(fastd_iface_t *iface, const char *ifname) {
fastd_android_send_pid();
} else {
/* this requires root on Android */
- open_iface_linux(iface, ifname, "/dev/tun");
+ open_iface_linux(iface, ifname, mtu, "/dev/tun");
}
}
#elif defined(__linux__)
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname) {
- open_iface_linux(iface, ifname, "/dev/net/tun");
+static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
+ open_iface_linux(iface, ifname, mtu, "/dev/net/tun");
}
#elif defined(__FreeBSD__) || defined(__OpenBSD__)
/** Sets the MTU of the TUN/TAP device */
-static void set_tun_mtu(fastd_iface_t *iface) {
+static void set_tun_mtu(fastd_iface_t *iface, uint16_t mtu) {
struct tuninfo tuninfo;
if (ioctl(iface->fd.fd, TUNGIFINFO, &tuninfo) < 0)
exit_errno("TUNGIFINFO ioctl failed");
- tuninfo.mtu = conf.mtu;
+ tuninfo.mtu = mtu;
if (ioctl(iface->fd.fd, TUNSIFINFO, &tuninfo) < 0)
exit_errno("TUNSIFINFO ioctl failed");
@@ -202,29 +202,29 @@ static void set_tun_mtu(fastd_iface_t *iface) {
#ifdef __FreeBSD__
/** Sets the MTU of the TAP device */
-static void set_tap_mtu(fastd_iface_t *iface) {
+static void set_tap_mtu(fastd_iface_t *iface, uint16_t mtu) {
struct tapinfo tapinfo;
if (ioctl(iface->fd.fd, TAPGIFINFO, &tapinfo) < 0)
exit_errno("TAPGIFINFO ioctl failed");
- tapinfo.mtu = conf.mtu;
+ tapinfo.mtu = mtu;
if (ioctl(iface->fd.fd, TAPSIFINFO, &tapinfo) < 0)
exit_errno("TAPSIFINFO ioctl failed");
}
/** Sets up the TUN device */
-static void setup_tun(fastd_iface_t *iface) {
+static void setup_tun(fastd_iface_t *iface, uint16_t mtu) {
int one = 1;
if (ioctl(iface->fd.fd, TUNSIFHEAD, &one) < 0)
exit_errno("TUNSIFHEAD ioctl failed");
- set_tun_mtu(iface);
+ set_tun_mtu(iface, mtu);
}
/** Sets up the TAP device */
-static void setup_tap(fastd_iface_t *iface) {
+static void setup_tap(fastd_iface_t *iface, uint16_t mtu) {
struct ifreq ifr = {};
if (ioctl(iface->fd.fd, TAPGIFNAME, &ifr) < 0)
@@ -233,11 +233,11 @@ static void setup_tap(fastd_iface_t *iface) {
free(iface->name);
iface->name = fastd_strndup(ifr.ifr_name, IFNAMSIZ-1);
- set_tap_mtu(iface);
+ set_tap_mtu(iface, mtu);
}
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname) {
+static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
char dev_name[5+IFNAMSIZ] = "/dev/";
const char *type;
@@ -273,11 +273,11 @@ static void open_iface(fastd_iface_t *iface, const char *ifname) {
switch (get_iface_type()) {
case IFACE_TYPE_TAP:
- setup_tap(iface);
+ setup_tap(iface, mtu);
break;
case IFACE_TYPE_TUN:
- setup_tun(iface);
+ setup_tun(iface, mtu);
break;
default:
@@ -311,19 +311,19 @@ static void set_link0(fastd_iface_t *iface, bool set) {
}
/** Sets up the TUN device */
-static void setup_tun(fastd_iface_t *iface) {
+static void setup_tun(fastd_iface_t *iface, uint16_t mtu) {
set_link0(iface, false);
- set_tun_mtu(iface);
+ set_tun_mtu(iface, mtu);
}
/** Sets up the TAP device */
-static void setup_tap(fastd_iface_t *iface) {
+static void setup_tap(fastd_iface_t *iface, uint16_t mtu) {
set_link0(iface, true);
- set_tun_mtu(iface);
+ set_tun_mtu(iface, mtu);
}
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname) {
+static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
char dev_name[5+IFNAMSIZ] = "/dev/";
if (!ifname)
exit_error("config error: no interface name given.");
@@ -340,11 +340,11 @@ static void open_iface(fastd_iface_t *iface, const char *ifname) {
switch (get_iface_type()) {
case IFACE_TYPE_TAP:
- setup_tap(iface);
+ setup_tap(iface, mtu);
break;
case IFACE_TYPE_TUN:
- setup_tun(iface);
+ setup_tun(iface, mtu);
break;
default:
@@ -357,7 +357,7 @@ static void open_iface(fastd_iface_t *iface, const char *ifname) {
#elif __APPLE__
/** Opens the TUN/TAP device */
-static void open_iface(fastd_iface_t *iface, const char *ifname) {
+static void open_iface(fastd_iface_t *iface, const char *ifname, uint16_t mtu) {
const char *devtype;
switch (get_iface_type()) {
case IFACE_TYPE_TAP:
@@ -392,7 +392,7 @@ static void open_iface(fastd_iface_t *iface, const char *ifname) {
struct ifreq ifr = {};
strncpy(ifr.ifr_name, ifname, IFNAMSIZ-1);
- ifr.ifr_mtu = conf.mtu;
+ ifr.ifr_mtu = mtu;
if (ioctl(ctl_sock, SIOCSIFMTU, &ifr) < 0)
exit_errno("SIOCSIFMTU ioctl failed");
@@ -409,7 +409,7 @@ static void open_iface(fastd_iface_t *iface, const char *ifname) {
/** Reads a packet from the TUN/TAP device */
void fastd_iface_handle(fastd_iface_t *iface) {
- size_t max_len = fastd_max_payload();
+ size_t max_len = fastd_max_payload(iface->mtu);
fastd_buffer_t buffer;
if (multiaf_tun && get_iface_type() == IFACE_TYPE_TUN)
@@ -514,9 +514,10 @@ fastd_iface_t * fastd_iface_open(fastd_peer_t *peer) {
fastd_iface_t *iface = fastd_new(fastd_iface_t);
iface->peer = peer;
+ iface->mtu = fastd_peer_get_mtu(peer);
pr_debug("initializing TUN/TAP device...");
- open_iface(iface, ifname);
+ open_iface(iface, ifname, iface->mtu);
if (iface->fd.fd < 0) {
free(iface);
diff --git a/src/peer.h b/src/peer.h
index e77462c..948bbc6 100644
--- a/src/peer.h
+++ b/src/peer.h
@@ -73,6 +73,7 @@ struct fastd_peer {
fastd_protocol_peer_state_t *protocol_state; /**< Protocol-specific peer state */
char *ifname; /**< Peer-specific interface name */
+ uint16_t mtu; /**< Peer-specific interface MTU */
/* Starting here, more dynamic fields follow: */
@@ -283,6 +284,16 @@ static inline const fastd_string_stack_t * fastd_peer_get_methods(const fastd_pe
return NULL;
}
+static inline uint16_t fastd_peer_get_mtu(const fastd_peer_t *peer) {
+ if (conf.mode == MODE_TAP)
+ return conf.mtu;
+
+ if (peer && peer->mtu)
+ return peer->mtu;
+
+ return conf.mtu;
+}
+
/** Checks if a MAC address is a normal unicast address */
static inline bool fastd_eth_addr_is_unicast(fastd_eth_addr_t addr) {
return ((addr.data[0] & 1) == 0);
diff --git a/src/protocols/ec25519_fhmqvc/handshake.c b/src/protocols/ec25519_fhmqvc/handshake.c
index bbe572d..bef4385 100644
--- a/src/protocols/ec25519_fhmqvc/handshake.c
+++ b/src/protocols/ec25519_fhmqvc/handshake.c
@@ -314,7 +314,7 @@ static void respond_handshake(const fastd_socket_t *sock, const fastd_peer_addre
if (!update_shared_handshake_key(peer, handshake_key, peer_handshake_key))
return;
- fastd_handshake_buffer_t buffer = fastd_handshake_new_reply(2, little_endian, method, fastd_peer_get_methods(peer), 4*(4+PUBLICKEYBYTES) + 2*(4+HASHBYTES));
+ fastd_handshake_buffer_t buffer = fastd_handshake_new_reply(2, little_endian, fastd_peer_get_mtu(peer), method, fastd_peer_get_methods(peer), 4*(4+PUBLICKEYBYTES) + 2*(4+HASHBYTES));
fastd_handshake_add(&buffer, RECORD_SENDER_KEY, PUBLICKEYBYTES, &conf.protocol_config->key.public);
fastd_handshake_add(&buffer, RECORD_RECIPIENT_KEY, PUBLICKEYBYTES, &peer->key->key);
@@ -373,7 +373,7 @@ static void finish_handshake(fastd_socket_t *sock, const fastd_peer_address_t *l
&peer->key->key, &sigma, compat ? NULL : shared_handshake_key.w, handshake_key->serial))
return;
- fastd_handshake_buffer_t buffer = fastd_handshake_new_reply(3, handshake->little_endian, method, NULL, 4*(4+PUBLICKEYBYTES) + 2*(4+HASHBYTES));
+ fastd_handshake_buffer_t buffer = fastd_handshake_new_reply(3, handshake->little_endian, fastd_peer_get_mtu(peer), method, NULL, 4*(4+PUBLICKEYBYTES) + 2*(4+HASHBYTES));
fastd_handshake_add(&buffer, RECORD_SENDER_KEY, PUBLICKEYBYTES, &conf.protocol_config->key.public);
fastd_handshake_add(&buffer, RECORD_RECIPIENT_KEY, PUBLICKEYBYTES, &peer->key->key);
@@ -661,6 +661,9 @@ void fastd_protocol_ec25519_fhmqvc_handshake_handle(fastd_socket_t *sock, const
}
}
+ if (!fastd_handshake_check_mtu(sock, local_addr, remote_addr, peer, handshake))
+ return;
+
if (!has_field(handshake, RECORD_SENDER_HANDSHAKE_KEY, PUBLICKEYBYTES)) {
pr_debug("received handshake without sender handshake key from %P[%I]", peer, remote_addr);
return;
diff --git a/src/receive.c b/src/receive.c
index df25364..338edea 100644
--- a/src/receive.c
+++ b/src/receive.c
@@ -244,7 +244,7 @@ static inline void handle_socket_receive(fastd_socket_t *sock, const fastd_peer_
/** Reads a packet from a socket */
void fastd_receive(fastd_socket_t *sock) {
- size_t max_len = 1 + fastd_max_payload() + conf.max_overhead;
+ size_t max_len = 1 + fastd_max_payload(ctx.max_mtu) + conf.max_overhead;
fastd_buffer_t buffer = fastd_buffer_alloc(max_len, conf.min_decrypt_head_space, conf.min_decrypt_tail_space);
fastd_peer_address_t local_addr;
fastd_peer_address_t recvaddr;
diff --git a/src/shell.c b/src/shell.c
index b678ba5..e8d6943 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -77,10 +77,18 @@ void fastd_shell_env_free(fastd_shell_env_t *env) {
/** Adds an interface name to a shell environment */
void fastd_shell_env_set_iface(fastd_shell_env_t *env, const fastd_iface_t *iface) {
- if (iface)
+ if (iface) {
+ char buf[6];
+
fastd_shell_env_set(env, "INTERFACE", iface->name);
- else
+
+ snprintf(buf, sizeof(buf), "%u", iface->mtu);
+ fastd_shell_env_set(env, "INTERFACE_MTU", buf);
+ }
+ else {
fastd_shell_env_set(env, "INTERFACE", NULL);
+ fastd_shell_env_set(env, "INTERFACE_MTU", NULL);
+ }
}
/** Applies a shell environment to the current process */
@@ -92,9 +100,6 @@ static void shell_command_setenv(pid_t pid, const fastd_shell_env_t *env) {
snprintf(buf, sizeof(buf), "%u", (unsigned)pid);
setenv("FASTD_PID", buf, 1);
- snprintf(buf, sizeof(buf), "%u", conf.mtu);
- setenv("INTERFACE_MTU", buf, 1);
-
if (!env)
return;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-22 12:40:28 +0100