2024 Bpf redirect

Bpf redirect

Author: wtid

August undefined, 2024

WebThis approach introduces a flag in bpf_redirect_info to indicate that napi_direct should be disabled even when _rx_napi variant is used as well as helper functions to use it. A NAPI handler who wants to use this flag needs to call xdp_set_return_frame_no_direct() before processing packets, and call xdp_clear_return_frame_no_direct() after xdp ... http://arthurchiao.art/blog/differentiate-bpf-redirects/

how exactly bpf redirect with BPF_MAP_TYPE_CPUMAP array?

WebJan 15, 2024 · BPF_MAP_TYPE_SOCKMAP: sockmaps are used primarily for socket redirection, where sockets added to a socket map and referenced by a key which dictates redirection when bpf_sockmap_redirect () is called. BPF_MAP_TYPE_DEVMAP: does a similar job to sockmap, with netdevices for XDP and bpf_redirect (). 2. Perf Events WebApr 11, 2024 · A tag already exists with the provided branch name. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. cornbread with vanilla pudding mix

linux/xdp_redirect_cpu_user.c at master · torvalds/linux · GitHub

WebOct 9, 2024 · Add an efficient ingress to ingress netns switch that can be used out of tc BPF programs in order to redirect traffic from host ns ingress into a container veth device … Web/* bpf_redirect_peer() is available only in TC BPF. */ return -ENOTSUP;} static __always_inline __maybe_unused __u64: ctx_full_len(const struct xdp_md *ctx) {__u64 len; /* Compute the length using inline assembly as clang * … WebJul 18, 2024 · Doing so will enable the BPF program to redirect incoming packets (with the bpf_redirect_map() function) to a specific socket that we created in userspace: Once everything has been allocated and strapped together, what I call "the descriptors dance" can start. While this has nothing to do with courtship behaviors it still requires a flawless ... fangirl phim

eBPF-based host-routing and tunnel mode #16280 - GitHub

Differentiate three types of eBPF redirects (2024)

http://arthurchiao.art/blog/differentiate-bpf-redirects/ WebNov 6, 2024 · The Extended Berkeley Packet Filter is a general-purpose execution engine with a small subset of C-oriented machine instructions that operate inside the Linux kernel. It has 114 instructions and 11 registers (2,000 instructions and 16 registers if compiled to x86) and is event-driven. fangirl outfitWebThe bpf_redirect() and bpf_redirect_map() helpers will lookup the target of the redirect and store it (along with some other metadata) in a per-CPU struct bpf_redirect_info. When … cornbread with cream style corn in it

"Weblong bpf_redirect(ifindex, flags) can be used to redirect the given packet to the given net device identified with ifindex. This helper is somewhat similar to bpf_clone_redirect(), … " - Bpf redirect

Bpf redirect

WebOct 9, 2024 · Add an efficient ingress to ingress netns switch that can be used out of tc BPF programs in order to redirect traffic from host ns ingress into a container veth device ingress without having to go via CPU backlog queue [0]. For local containers this can also be utilized and path via CPU backlog queue only needs Webxdp_redirect_map.bpf.c - samples/bpf/xdp_redirect_map.bpf.c - Linux source code (v6.2.2) - Bootlin. Elixir Cross Referencer - Explore source code in your browser - …

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Webint bpf_redirect(u32 ifindex, u64 flags) Description. Redirect the packet to another net device of index ifindex. This helper is somewhat similar to bpf_clone_redirect(), except that the packet is not cloned, which provides increased performance. Except for XDP, both ingress and egress interfaces can be used for redirection. WebNetdev Archive on lore.kernel.org help / color / mirror / Atom feed * [PATCH bpf-next 0/6] Follow-up BPF helper improvements @ 2024-10-08 21:31 Daniel Borkmann 2024-10-08 21:31 ` [PATCH bpf-next 1/6] bpf: improve bpf_redirect_neigh helper description Daniel Borkmann ` (5 more replies) 0 siblings, 6 replies; 11+ messages in thread From: Daniel …

http://bankbp.com/ Webbpf_redirect_map () ¶ long bpf_redirect_map(struct bpf_map *map, u32 key, u64 flags) Redirect the packet to the endpoint referenced by map at index key . For BPF_MAP_TYPE_XSKMAP this map contains references to XSK FDs for sockets attached to a netdev’s queues. Note If the map is empty at an index, the packet is dropped.

WebUsing the XDP_REDIRECT action from an XDP program, the program can redirect ingress frames to other XDP enabled netdevs, using the bpf_redirect_map () function. AF_XDP … http://arthurchiao.art/blog/differentiate-bpf-redirects/#:~:text=long%20bpf_redirect%20%28ifindex%2C%20flags%29%20can%20be%20used%20to,with%20clone_redirect%20%28%29%20according%20to%20the%20commit%20message%29.

WebIn comparison with bpf_redirect() helper, bpf_clone_redirect() has the associated cost of duplicating the packet buffer, but this can be executed out of the eBPF program. …

WebMay 18, 2024 · All the non-attack packets are redirected across the machines. This is used to work around the ECMP problems, gives us fine-granularity load balancing and allows us to gracefully take servers out of … fan girl of the month clubWebPacket Filter (originally known as BPF, for better distinction referred to as cBPF here) are both available as a fully programmable and highly efficient classifier and actions. They … cornbread with sweet milkWeberr = bpf_map_update_elem ( bpf_map__fd (skel-> maps. tx_port ), &key, &val, 0 ); return bpf_program__fd (skel-> progs. xdp_redirect_cpu_devmap ); fprintf (stderr, "Invalid … fangirlmoonshopWeblinux/samples/bpf/xdp_redirect_cpu_user.c Go to file Cannot retrieve contributors at this time 559 lines (502 sloc) 14.9 KB Raw Blame // SPDX-License-Identifier: GPL-2.0-only /* Copyright (c) 2024 Jesper Dangaard Brouer, Red Hat, Inc. */ static const char *__doc__ = "XDP CPU redirect tool, using BPF_MAP_TYPE_CPUMAP\n" cornbread with ground beefWebMay 11, 2024 · And the BPF prog from cilium_vxlan/geneve will redirect at tc layer to the Pod. From the Pod in bpf_lxc, it will redirect back to the tunnel dev. The one difference here for Pod-Pod case is that due to the use of redirect_peer() it will decrease the latency slightly due to not having to switch to the different netns via net_rx_action. fangirl race horseWebMay 13, 2024 · BPF maps are generic key-value stores and can have different data types. The maps are used both as an interface between a user-space application and an eBPF … fan girl outWebJan 10, 2024 · The basic idea is that the helper performs the needed work to change the size of the packet, then the eBPF program rewrites the rest via helpers like … cornbringer patreon