Learn how TC-BPF revolutionizes DNS redirection in Docker environments.
The adoption of eBPF has revolutionized high-performance applications, tracing, security, and packet filtering within the Linux kernel. Specifically, TC-BPF, a type of eBPF program attached to the Traffic Control layer, has emerged as a powerful tool for packet manipulation in both ingress and egress. This blog delves into the practical application of TC-BPF to redirect DNS queries in a Docker environment.
2130706433 #define && ntohs== contains the IP 127.0.0.1 converted to an integer. contains the IP 127.0.0.1 converted to an integer. 127.0.0.1 is the port at which the dockerd daemon is exposed. We can find this out by doing: sudo nsenter -n -t $ lsof -i -P -n sudo nsenter -n -t $ lsof -i -P -n We can't just do lsof inside the docker container since dockerd is running in the host pid namespace and hence invisible to processes inside the container. In our case, it is at port 41552. lsof APP_CONTAINER_IP is the IP of the eth0 interface in the container. We can find this out by doing docker inspect.
_INTERFACE_INDEX 1 #define ETH0_INTERFACE_INDEX 2 #define _INTERFACE_INDEX 1 #define ETH0_INTERFACE_INDEX 2 Define some structs we might need. l3_fields is a struct that contains ipv4 source and destination. Whereas l4_fields contains the source port and destination port in the udp header.
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