LineageOS/android_packages_modules_Connectivity
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

clatd - preparation for ipv6 to ipv4 fragmentation translation

Browse Source 
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I67ba03796ab93844c93f2b142880b6de6de75f7f
This commit is contained in:
Maciej Żenczykowski
2022-10-24 03:08:06 -07:00
parent e0ddc47540
commit 321321c7b1
1 changed files with 11 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

18
bpf_progs/clatd.c
View File

@@ -100,7 +100,11 @@ static inline __always_inline int nat64(struct __sk_buff* skb, bool is_ethernet)
if (!v) return TC_ACT_PIPE;
switch (ip6->nexthdr) {
__u8 proto = ip6->nexthdr;
__be16 ip_id = 0;
__be16 frag_off = htons(IP_DF);
switch (proto) {
case IPPROTO_TCP: // For TCP & UDP the checksum neutrality of the chosen IPv6
case IPPROTO_UDP: // address means there is no need to update their checksums.
case IPPROTO_GRE: // We do not need to bother looking at GRE/ESP headers,
@@ -125,14 +129,14 @@ static inline __always_inline int nat64(struct __sk_buff* skb, bool is_ethernet)
.version = 4, // u4
.ihl = sizeof(struct iphdr) / sizeof(__u32), // u4
.tos = (ip6->priority << 4) + (ip6->flow_lbl[0] >> 4), // u8
.tot_len = htons(ntohs(ip6->payload_len) + sizeof(struct iphdr)), // u16
.id = 0, // u16
.frag_off = htons(IP_DF), // u16
.tot_len = htons(ntohs(ip6->payload_len) + sizeof(struct iphdr)), // be16
.id = ip_id, // be16
.frag_off = frag_off, // be16
.ttl = ip6->hop_limit, // u8
.protocol = ip6->nexthdr, // u8
.protocol = proto, // u8
.check = 0, // u16
.saddr = ip6->saddr.in6_u.u6_addr32[3], // u32
.daddr = v->local4.s_addr, // u32
.saddr = ip6->saddr.in6_u.u6_addr32[3], // be32
.daddr = v->local4.s_addr, // be32
};
// Calculate the IPv4 one's complement checksum of the IPv4 header.