The route table that is dumped when the xdp_router_ipv4 process is launched has the "Gateway" field in non-readable network byte order format, also the alignment is off when printing the table. Destination Gateway Genmask Metric Iface 0.0.0.0 196a8c0 0 0 enp7s0 0.0.0.0 196a8c0 0 0 wlp6s0 169.254.0.0 196a8c0 16 0 enp7s0 172.17.0.0 0 16 0 docker0 192.168.150.0 0 24 0 enp7s0 192.168.150.0 0 24 0 wlp6s0 Fix this by converting the "Gateway" field from network byte order Hex into dotted decimal notation IPv4 format and "Genmask" from CIDR notation into dotted decimal notation IPv4 format. Also fix the aligntment of the fields in the route table. Destination Gateway Genmask Metric Iface 0.0.0.0 192.168.150.1 0.0.0.0 0 enp7s0 0.0.0.0 192.168.150.1 0.0.0.0 0 wlp6s0 169.254.0.0 192.168.150.1 255.255.0.0 0 enp7s0 172.17.0.0 0.0.0.0 255.255.0.0 0 docker0 192.168.150.0 0.0.0.0 255.255.255.0 0 enp7s0 192.168.150.0 0.0.0.0 255.255.255.0 0 wlp6s0
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| @@ -155,7 +155,7 @@ static void read_route(struct nlmsghdr *nh, int nll) · 154 unmodified lines | ||
| 155 | 155 | printf("%d\n", nh->nlmsg_type); |
| 156 | 156 | |
| 157 | 157 | memset(&route, 0, sizeof(route)); |
| 158 | − printf("Destination\t\tGateway\t\tGenmask\t\tMetric\t\tIface\n"); | |
| 158 | + printf("Destination Gateway Genmask Metric Iface\n"); | |
| 159 | 159 | for (; NLMSG_OK(nh, nll); nh = NLMSG_NEXT(nh, nll)) { |
| 160 | 160 | rt_msg = (struct rtmsg *)NLMSG_DATA(nh); |
| 161 | 161 | rtm_family = rt_msg->rtm_family; |
| @@ -207,6 +207,7 @@ static void read_route(struct nlmsghdr *nh, int nll) · 45 unmodified lines | ||
| 207 | 207 | int metric; |
| 208 | 208 | __be32 gw; |
| 209 | 209 | } *prefix_value; |
| 210 | + struct in_addr dst_addr, gw_addr, mask_addr; | |
| 210 | 211 | |
| 211 | 212 | prefix_key = alloca(sizeof(*prefix_key) + 3); |
| 212 | 213 | prefix_value = alloca(sizeof(*prefix_value)); |
| @@ -234,14 +235,17 @@ static void read_route(struct nlmsghdr *nh, int nll) · 21 unmodified lines | ||
| 234 | 235 | for (i = 0; i < 4; i++) |
| 235 | 236 | prefix_key->data[i] = (route.dst >> i * 8) & 0xff; |
| 236 | 237 | |
| 237 | − printf("%3d.%d.%d.%d\t\t%3x\t\t%d\t\t%d\t\t%s\n", | |
| 238 | − (int)prefix_key->data[0], | |
| 239 | − (int)prefix_key->data[1], | |
| 240 | − (int)prefix_key->data[2], | |
| 241 | − (int)prefix_key->data[3], | |
| 242 | − route.gw, route.dst_len, | |
| 238 | + dst_addr.s_addr = route.dst; | |
| 239 | + printf("%-16s", inet_ntoa(dst_addr)); | |
| 240 | + | |
| 241 | + gw_addr.s_addr = route.gw; | |
| 242 | + printf("%-16s", inet_ntoa(gw_addr)); | |
| 243 | + | |
| 244 | + mask_addr.s_addr = htonl(~(0xffffffffU >> route.dst_len)); | |
| 245 | + printf("%-16s%-7d%s\n", inet_ntoa(mask_addr), | |
| 243 | 246 | route.metric, |
| 244 | 247 | route.iface_name); |
| 248 | + | |
| 245 | 249 | if (bpf_map_lookup_elem(lpm_map_fd, prefix_key, |
| 246 | 250 | prefix_value) < 0) { |
| 247 | 251 | for (i = 0; i < 4; i++) |
| @@ -672,7 +676,7 @@ int main(int ac, char **argv) · 424 unmodified lines | ||
| 672 | 676 | if (bpf_prog_load_xattr(&prog_load_attr, &obj, &prog_fd)) |
| 673 | 677 | return 1; |
| 674 | 678 | |
| 675 | − printf("\n**************loading bpf file*********************\n\n\n"); | |
| 679 | + printf("\n******************loading bpf file*********************\n"); | |
| 676 | 680 | if (!prog_fd) { |
| 677 | 681 | printf("bpf_prog_load_xattr: %s\n", strerror(errno)); |
| 678 | 682 | return 1; |
| @@ -722,7 +726,7 @@ int main(int ac, char **argv) · 43 unmodified lines | ||
| 722 | 726 | signal(SIGINT, int_exit); |
| 723 | 727 | signal(SIGTERM, int_exit); |
| 724 | 728 | |
| 725 | − printf("*******************ROUTE TABLE*************************\n\n\n"); | |
| 729 | + printf("\n*******************ROUTE TABLE*************************\n"); | |
| 726 | 730 | get_route_table(AF_INET); |
| 727 | 731 | printf("*******************ARP TABLE***************************\n\n\n"); |
| 728 | 732 | get_arp_table(AF_INET); |