LineageOS/android_packages_modules_Connectivity
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bpf tether offload - do not offload TCP SYN/FIN/RST packets am: fc4f6540be

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Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/1558667

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5d5fef2e673d96a465a8d8c12a973cf8193089f4
This commit is contained in:
Maciej Żenczykowski
2021-01-23 08:52:06 +00:00
committed by Automerger Merge Worker
parent 564a92f6c4 fc4f6540be
commit d4fb2bcf13
1 changed files with 12 additions and 0 deletions
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12
Tethering/bpf_progs/offload.c
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@@ -66,6 +66,18 @@ static inline __always_inline int do_forward(struct __sk_buff* skb, const bool i
// Let the kernel's stack handle these cases and generate appropriate ICMP errors.
if (ip6->hop_limit <= 1) return TC_ACT_OK;
// If hardware offload is running and programming flows based on conntrack entries,
// try not to interfere with it.
if (ip6->nexthdr == IPPROTO_TCP) {
struct tcphdr* tcph = (void*)(ip6 + 1);
// Make sure we can get at the tcp header
if (data + l2_header_size + sizeof(*ip6) + sizeof(*tcph) > data_end) return TC_ACT_OK;
// Do not offload TCP packets with any one of the SYN/FIN/RST flags
if (tcph->syn || tcph->fin || tcph->rst) return TC_ACT_OK;
}
// Protect against forwarding packets sourced from ::1 or fe80::/64 or other weirdness.
__be32 src32 = ip6->saddr.s6_addr32[0];
if (src32 != htonl(0x0064ff9b) && // 64:ff9b:/32 incl. XLAT464 WKP