diff options
-rw-r--r-- | clatd.c | 3 | ||||
-rw-r--r-- | config.h | 2 | ||||
-rw-r--r-- | tun.c | 71 | ||||
-rw-r--r-- | tun.h | 1 |
4 files changed, 77 insertions, 0 deletions
@@ -496,6 +496,9 @@ int main(int argc, char **argv) { // run under a regular user drop_root(); + //check HW features and disable checksum validation if already handled by hardware + rx_checksum_offloaded = check_csum_offload(uplink_interface); + // we can create tun devices as non-root because we're in the VPN group. tunnel.fd4 = tun_open(); if(tunnel.fd4 < 0) { @@ -39,6 +39,8 @@ struct clat_config { extern struct clat_config Global_Clatd_Config; +extern int rx_checksum_offloaded; + int read_config(const char *file, const char *uplink_interface, const char *plat_prefix, unsigned net_id); void config_generate_local_ipv6_subnet(struct in6_addr *interface_ip); @@ -22,10 +22,14 @@ #include <linux/if.h> #include <linux/if_tun.h> #include <sys/ioctl.h> +#include <linux/ethtool.h> #include <sys/uio.h> +#include "config.h" #include "clatd.h" +int rx_checksum_offloaded = 0; + /* function: tun_open * tries to open the tunnel device */ @@ -61,6 +65,11 @@ int tun_alloc(char *dev, int fd) { return err; } strcpy(dev, ifr.ifr_name); + + if (rx_checksum_offloaded) { + ioctl(fd, TUNSETNOCSUM, 1); + } + return 0; } @@ -87,3 +96,65 @@ int set_nonblocking(int fd) { int send_tun(int fd, clat_packet out, int iov_len) { return writev(fd, out, iov_len); } + +/* function: get_ethtool_feature_val + * gets if a particular ethtool feature is enabled + * dev - the device name to query the feature on + * cmd - the feature to query + * returns: 1 if feature is enabled, 0 if disabled + */ +int get_ethtool_feature_val(char *dev, int cmd) { + int fd; + struct ifreq ifr; + struct ethtool_value eval; + + if (!dev){ + return 0; + } + + if((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0 ) { + return 0; + } + + memset(&ifr, 0, sizeof(ifr)); + memset(&eval, 0, sizeof(eval)); + strlcpy(ifr.ifr_name, dev, sizeof(ifr.ifr_name)); + eval.cmd = cmd; + eval.data = 0; + ifr.ifr_data = (caddr_t)&eval; + if (ioctl(fd, SIOCETHTOOL, &ifr) == -1) { + close(fd); + return 0; + } + + close(fd); + + if (!eval.data) { + return 0; + } + + return 1; +} + +/* function: check_csum_offload + * checks if GRO and RXCSUM are enabled on the device + * dev - the device name to query on + * returns: 1 if checksum is offloaded, 0 if checksum needs + * to be validated in network stack. + */ +int check_csum_offload(char *dev) { + int fd; + struct ifreq ifr; + struct ethtool_value eval; + + if (!dev){ + return 0; + } + + if(get_ethtool_feature_val(dev, ETHTOOL_GGRO) && + get_ethtool_feature_val(dev, ETHTOOL_GRXCSUM)) { + return 1; + } + + return 0; +} @@ -33,5 +33,6 @@ int tun_open(); int tun_alloc(char *dev, int fd); int send_tun(int fd, clat_packet out, int iov_len); int set_nonblocking(int fd); +int check_csum_offload(char *dev); #endif |