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Merge "merge Tether{Down,Up}stream6Value -> Tether6Value"

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This commit is contained in:
Treehugger Robot
2021-01-27 07:18:35 +00:00
committed by Gerrit Code Review
parent f0be057728 7dfbcf58d2
commit 33848955b0
2 changed files with 12 additions and 14 deletions
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24
Tethering/bpf_progs/offload.c
View File

@@ -40,13 +40,13 @@ DEFINE_BPF_MAP_GRW(tether_limit_map, HASH, TetherLimitKey, TetherLimitValue, 16,
// ----- IPv6 Support -----
DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, TetherDownstream6Value, 64,
DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, Tether6Value, 64,
AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_downstream64_map, HASH, TetherDownstream64Key, TetherDownstream64Value,
64, AID_NETWORK_STACK)
DEFINE_BPF_MAP_GRW(tether_upstream6_map, HASH, TetherUpstream6Key, TetherUpstream6Value, 64,
DEFINE_BPF_MAP_GRW(tether_upstream6_map, HASH, TetherUpstream6Key, Tether6Value, 64,
AID_NETWORK_STACK)
static inline __always_inline int do_forward6(struct __sk_buff* skb, const bool is_ethernet,
@@ -113,14 +113,13 @@ static inline __always_inline int do_forward6(struct __sk_buff* skb, const bool
.iif = skb->ifindex,
};
TetherDownstream6Value* vd = downstream ? bpf_tether_downstream6_map_lookup_elem(&kd) : NULL;
TetherUpstream6Value* vu = downstream ? NULL : bpf_tether_upstream6_map_lookup_elem(&ku);
Tether6Value* v = downstream ? bpf_tether_downstream6_map_lookup_elem(&kd)
: bpf_tether_upstream6_map_lookup_elem(&ku);
// If we don't find any offload information then simply let the core stack handle it...
if (downstream && !vd) return TC_ACT_OK;
if (!downstream && !vu) return TC_ACT_OK;
if (!v) return TC_ACT_OK;
uint32_t stat_and_limit_k = downstream ? skb->ifindex : vu->oif;
uint32_t stat_and_limit_k = downstream ? skb->ifindex : v->oif;
TetherStatsValue* stat_v = bpf_tether_stats_map_lookup_elem(&stat_and_limit_k);
@@ -133,8 +132,7 @@ static inline __always_inline int do_forward6(struct __sk_buff* skb, const bool
if (!limit_v) return TC_ACT_OK;
// Required IPv6 minimum mtu is 1280, below that not clear what we should do, abort...
const int pmtu = downstream ? vd->pmtu : vu->pmtu;
if (pmtu < IPV6_MIN_MTU) return TC_ACT_OK;
if (v->pmtu < IPV6_MIN_MTU) return TC_ACT_OK;
// Approximate handling of TCP/IPv6 overhead for incoming LRO/GRO packets: default
// outbound path mtu of 1500 is not necessarily correct, but worst case we simply
@@ -145,9 +143,9 @@ static inline __always_inline int do_forward6(struct __sk_buff* skb, const bool
// (This is also blindly assuming 12 bytes of tcp timestamp option in tcp header)
uint64_t packets = 1;
uint64_t bytes = skb->len;
if (bytes > pmtu) {
if (bytes > v->pmtu) {
const int tcp_overhead = sizeof(struct ipv6hdr) + sizeof(struct tcphdr) + 12;
const int mss = pmtu - tcp_overhead;
const int mss = v->pmtu - tcp_overhead;
const uint64_t payload = bytes - tcp_overhead;
packets = (payload + mss - 1) / mss;
bytes = tcp_overhead * packets + payload;
@@ -203,7 +201,7 @@ static inline __always_inline int do_forward6(struct __sk_buff* skb, const bool
// Overwrite any mac header with the new one
// For a rawip tx interface it will simply be a bunch of zeroes and later stripped.
*eth = downstream ? vd->macHeader : vu->macHeader;
*eth = v->macHeader;
// Redirect to forwarded interface.
//
@@ -211,7 +209,7 @@ static inline __always_inline int do_forward6(struct __sk_buff* skb, const bool
// The redirect actually happens after the ebpf program has already terminated,
// and can fail for example for mtu reasons at that point in time, but there's nothing
// we can do about it here.
return bpf_redirect(downstream ? vd->oif : vu->oif, 0 /* this is effectively BPF_F_EGRESS */);
return bpf_redirect(v->oif, 0 /* this is effectively BPF_F_EGRESS */);
}
DEFINE_BPF_PROG("schedcls/tether_downstream6_ether", AID_ROOT, AID_NETWORK_STACK,

2
Tethering/bpf_progs/test.c
View File

@@ -23,7 +23,7 @@
#include "netdbpf/bpf_shared.h"
// Used only by TetheringPrivilegedTests, not by production code.
DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, TetherDownstream6Value, 16,
DEFINE_BPF_MAP_GRW(tether_downstream6_map, HASH, TetherDownstream6Key, Tether6Value, 16,
AID_NETWORK_STACK)
DEFINE_BPF_PROG_KVER("xdp/drop_ipv4_udp_ether", AID_ROOT, AID_NETWORK_STACK,