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-rw-r--r--src/ipcpd/shim-eth-llc/main.c154
1 files changed, 79 insertions, 75 deletions
diff --git a/src/ipcpd/shim-eth-llc/main.c b/src/ipcpd/shim-eth-llc/main.c
index 3fd2188a..9e315335 100644
--- a/src/ipcpd/shim-eth-llc/main.c
+++ b/src/ipcpd/shim-eth-llc/main.c
@@ -77,6 +77,7 @@ typedef ShimEthLlcMsg shim_eth_llc_msg_t;
#define MAC_SIZE 6
#define LLC_HEADER_SIZE 3
#define MAX_SAPS 64
+#define ETH_HEADER_SIZE (2 * MAC_SIZE + 2)
/* global for trapping signal */
int irmd_api;
@@ -87,6 +88,17 @@ struct ipcp * _ipcp;
#define ipcp_flow(index) ((struct flow *) &(shim_data(_ipcp)->flows[index]))
+struct eth_llc_frame {
+ uint8_t dst_hwaddr[MAC_SIZE];
+ uint8_t src_hwaddr[MAC_SIZE];
+ uint8_t length[2];
+ uint8_t dsap;
+ uint8_t ssap;
+ uint8_t cf;
+ uint8_t size[2];
+ uint8_t payload;
+};
+
struct eth_llc_flow {
struct flow flow;
uint8_t sap;
@@ -224,9 +236,9 @@ static int port_id_to_index(int port_id)
}
/* only call this under flows_lock */
-static int addr_and_saps_to_index(uint8_t r_addr[MAC_SIZE],
- uint8_t r_sap,
- uint8_t sap)
+static int addr_and_saps_to_index(const uint8_t * r_addr,
+ uint8_t r_sap,
+ uint8_t sap)
{
int i = 0;
@@ -286,11 +298,12 @@ static int eth_llc_ipcp_send_frame(uint8_t dst_addr[MAC_SIZE],
uint8_t * payload,
size_t len)
{
-
int frame_len = 0;
uint8_t cf = 0x03;
int fd;
- uint16_t length = 0;
+
+ uint16_t size;
+ uint16_t length;
#if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
struct pollfd pfd;
@@ -304,12 +317,18 @@ static int eth_llc_ipcp_send_frame(uint8_t dst_addr[MAC_SIZE],
struct sockaddr_ll device;
#endif
#endif
-
+ struct eth_llc_frame * llc_frame;
if (payload == NULL) {
LOG_ERR("Payload was NULL.");
return -1;
}
+ if (len > SHIM_ETH_LLC_MAX_SDU_SIZE - 2) {
+ LOG_WARN("Payload exceeds MTU (%lu > %d).",
+ (unsigned long) len, SHIM_ETH_LLC_MAX_SDU_SIZE);
+ return -1;
+ }
+
fd = (shim_data(_ipcp))->s_fd;
#if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
@@ -333,35 +352,35 @@ static int eth_llc_ipcp_send_frame(uint8_t dst_addr[MAC_SIZE],
frame = (void *) header + TPACKET_HDRLEN - sizeof(struct sockaddr_ll);
#endif
- length = htons(len + LLC_HEADER_SIZE);
+ llc_frame = (struct eth_llc_frame *) frame;
- memcpy(frame, dst_addr, MAC_SIZE * sizeof(uint8_t));
- frame_len += MAC_SIZE;
- memcpy(frame + frame_len,
+ memcpy(&llc_frame->dst_hwaddr, dst_addr, MAC_SIZE);
+ memcpy(&llc_frame->src_hwaddr,
#ifdef __FreeBSD__
LLADDR(&shim_data(_ipcp)->device),
#else
shim_data(_ipcp)->device.sll_addr,
#endif
- MAC_SIZE * sizeof(uint8_t));
- frame_len += MAC_SIZE;
- memcpy(frame + frame_len, &length, 2 * sizeof(uint8_t));
- frame_len += 2 * sizeof(uint8_t);
- memcpy(frame + frame_len, &dsap, sizeof(uint8_t));
- frame_len += sizeof(uint8_t);
- memcpy(frame + frame_len, &ssap, sizeof(uint8_t));
- frame_len += sizeof(uint8_t);
- memcpy(frame + frame_len, &cf, sizeof(uint8_t));
- frame_len += sizeof(uint8_t);
- memcpy(frame + frame_len, payload, len);
- frame_len += len;
+ MAC_SIZE);
+
+ length = htons(LLC_HEADER_SIZE + sizeof(size) + len);
+ memcpy(&llc_frame->length, &length, sizeof(length));
+ llc_frame->dsap = dsap;
+ llc_frame->ssap = ssap;
+ llc_frame->cf = cf;
+ /* write the payload length, can't trust the driver */
+ size = htons(len);
+ memcpy(&llc_frame->size, &size, sizeof(size));
+ memcpy(&llc_frame->payload, payload, len);
+
+ frame_len = ETH_HEADER_SIZE + LLC_HEADER_SIZE + sizeof(uint16_t) + len;
#if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
header->tp_len = frame_len;
header->tp_status = TP_STATUS_SEND_REQUEST;
if (send(fd, NULL, 0, 0) < 0) {
- LOG_ERR("Failed to send message.");
+ LOG_ERR("Failed to write frame into TX_RING.");
return -1;
}
@@ -631,16 +650,14 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
{
ssize_t index;
struct rb_entry e;
- uint8_t src_mac[MAC_SIZE];
- uint8_t dst_mac[MAC_SIZE];
uint8_t br_addr[MAC_SIZE];
- int frame_len = 0;
- int len_frame = 0;
- uint8_t ssap = 0;
- uint8_t dsap = 0;
+ uint8_t dsap;
+ uint8_t ssap;
int i = 0;
- int j = 0;
- int eth_type = 0;
+ struct eth_llc_frame * llc_frame;
+
+ uint16_t length;
+ uint16_t size;
#if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
struct pollfd pfd;
@@ -649,6 +666,7 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
uint8_t * buf = NULL;
#else
uint8_t buf[SHIM_ETH_LLC_MAX_SDU_SIZE];
+ int frame_len = 0;
#endif
memset(br_addr, 0xff, MAC_SIZE * sizeof(uint8_t));
@@ -681,7 +699,6 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
}
buf = (void * ) header + header->tp_mac;
- frame_len = header->tp_len;
#else
frame_len = recv(shim_data(_ipcp)->s_fd, buf,
SHIM_ETH_LLC_MAX_SDU_SIZE, 0);
@@ -690,16 +707,17 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
continue;
}
#endif
- for (i = 0; i < MAC_SIZE; i++)
- dst_mac[i] = buf[i];
+
+ llc_frame = (struct eth_llc_frame *) buf;
+
#ifdef __FreeBSD__
if (memcmp(LLADDR(&shim_data(_ipcp)->device),
#else
if (memcmp(shim_data(_ipcp)->device.sll_addr,
#endif
- dst_mac,
+ &llc_frame->dst_hwaddr,
MAC_SIZE) &&
- memcmp(br_addr, dst_mac, MAC_SIZE)) {
+ memcmp(br_addr, &llc_frame->dst_hwaddr, MAC_SIZE)) {
#if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
offset = (offset + 1) & (SHM_BLOCKS_IN_MAP - 1);
header->tp_status = TP_STATUS_KERNEL;
@@ -707,11 +725,9 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
continue;
}
- for (; i < 2 * MAC_SIZE; i++)
- src_mac[i - MAC_SIZE] = buf[i];
+ memcpy(&length, &llc_frame->length, sizeof(length));
- eth_type = (((buf[i]) << 8) + buf[i + 1]);
- if (eth_type > SHIM_ETH_LLC_MAX_SDU_SIZE) {
+ if (ntohs(length) > SHIM_ETH_LLC_MAX_SDU_SIZE) {
/* Not an LLC packet. */
#if defined(PACKET_RX_RING) && defined(PACKET_TX_RING)
offset = (offset + 1) & (SHM_BLOCKS_IN_MAP - 1);
@@ -720,35 +736,23 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
continue;
}
- len_frame = ((buf[i]) << 8) + buf[i + 1];
- len_frame -= 3;
- i += 2;
-
- dsap = reverse_bits(buf[i++]);
- ssap = reverse_bits(buf[i++]);
- i++;
-
- frame_len -= i;
-
- /*
- * Take minimum of length reported in frame
- * and frame length reported by kernel. Some device
- * drivers change the length in the frame. Some
- * others add padding, making the length reported
- * by the kernel too high. Sigh. Lousy workaround.
- */
- frame_len = MIN(frame_len, len_frame);
-
- if (ssap == MGMT_SAP &&
- dsap == MGMT_SAP) {
- eth_llc_ipcp_mgmt_frame((uint8_t *) (buf + i),
- frame_len, src_mac);
+ dsap = reverse_bits(llc_frame->dsap);
+ ssap = reverse_bits(llc_frame->ssap);
+
+ memcpy(&size, &llc_frame->size, sizeof(length));
+
+ if (ssap == MGMT_SAP && dsap == MGMT_SAP) {
+ eth_llc_ipcp_mgmt_frame(&llc_frame->payload,
+ ntohs(size),
+ llc_frame->src_hwaddr);
} else {
pthread_rwlock_rdlock(&_ipcp->state_lock);
pthread_rwlock_rdlock(&shim_data(_ipcp)->flows_lock);
- j = addr_and_saps_to_index(src_mac, ssap, dsap);
- if (j < 0) {
+ i = addr_and_saps_to_index(llc_frame->src_hwaddr,
+ ssap,
+ dsap);
+ if (i < 0) {
pthread_rwlock_unlock(&shim_data(_ipcp)->
flows_lock);
pthread_rwlock_unlock(&_ipcp->state_lock);
@@ -760,18 +764,20 @@ static void * eth_llc_ipcp_sdu_reader(void * o)
continue;
}
- while ((index = shm_du_map_write(shim_data(_ipcp)->dum,
- ipcp_flow(j)->api,
- 0,
- 0,
- (uint8_t *) (buf + i),
- frame_len)) < 0)
+ while ((index =
+ shm_du_map_write(shim_data(_ipcp)->dum,
+ ipcp_flow(i)->api,
+ 0,
+ 0,
+ &llc_frame->payload,
+ ntohs(size)))
+ < 0)
;
e.index = index;
- e.port_id = ipcp_flow(j)->port_id;
+ e.port_id = ipcp_flow(i)->port_id;
- while (shm_ap_rbuff_write(ipcp_flow(j)->rb, &e) < 0)
+ while (shm_ap_rbuff_write(ipcp_flow(i)->rb, &e) < 0)
;
pthread_rwlock_unlock(&shim_data(_ipcp)->flows_lock);
@@ -1291,8 +1297,6 @@ static int eth_llc_ipcp_flow_dealloc(int port_id)
ret = eth_llc_ipcp_port_dealloc(addr, sap);
pthread_rwlock_unlock(&_ipcp->state_lock);
- if (eth_llc_ipcp_port_dealloc(addr, sap) < 0)
- LOG_DBGF("Could not notify remote.");
if (ret < 0)
LOG_DBGF("Could not notify remote.");
generated by cgit v1.2.3 (git 2.39.1) at 2025-10-31 18:54:06 +0000