LineageOS/android_packages_modules_Connectivity
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rename try_make_readable() to try_make_writable()

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In practice this function makes things readable and writable,
so use a less confusing name.

Test: TreeHugger, 'git grep try_make_readable' comes up empty
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I32faad148cc5714cf0ec7246620376ed4dd3d6d2
This commit is contained in:
Maciej Żenczykowski
2022-04-11 23:29:46 -07:00
parent b3bf5fedab
commit 824fb294ee
3 changed files with 7 additions and 6 deletions
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5
bpf_progs/bpf_net_helpers.h
View File

@@ -65,8 +65,9 @@ static inline __always_inline __unused bool is_received_skb(struct __sk_buff* sk
skb->pkt_type == PACKET_MULTICAST;
}
// try to make the first 'len' header bytes readable via direct packet access
static inline __always_inline void try_make_readable(struct __sk_buff* skb, int len) {
// try to make the first 'len' header bytes readable/writable via direct packet access
// (note: AFAIK there is no way to ask for only direct packet read without also getting write)
static inline __always_inline void try_make_writable(struct __sk_buff* skb, int len) {
if (len > skb->len) len = skb->len;
if (skb->data_end - skb->data < len) bpf_skb_pull_data(skb, len);
}

4
bpf_progs/clatd.c
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@@ -57,7 +57,7 @@ static inline __always_inline int nat64(struct __sk_buff* skb, bool is_ethernet)
// Not clear if this is actually necessary considering we use DPA (Direct Packet Access),
// but we need to make sure we can read the IPv6 header reliably so that we can set
// skb->mark = 0xDeadC1a7 for packets we fail to offload.
try_make_readable(skb, l2_header_size + sizeof(struct ipv6hdr));
try_make_writable(skb, l2_header_size + sizeof(struct ipv6hdr));
void* data = (void*)(long)skb->data;
const void* data_end = (void*)(long)skb->data_end;
@@ -224,7 +224,7 @@ DEFINE_BPF_PROG("schedcls/egress4/clat_rawip", AID_ROOT, AID_SYSTEM, sched_cls_e
if (skb->protocol != htons(ETH_P_IP)) return TC_ACT_PIPE;
// Possibly not needed, but for consistency with nat64 up above
try_make_readable(skb, sizeof(struct iphdr));
try_make_writable(skb, sizeof(struct iphdr));
void* data = (void*)(long)skb->data;
const void* data_end = (void*)(long)skb->data_end;

4
bpf_progs/offload.c
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@@ -122,7 +122,7 @@ static inline __always_inline int do_forward6(struct __sk_buff* skb, const bool
// not trigger and thus we need to manually make sure we can read packet headers via DPA.
// Note: this is a blind best effort pull, which may fail or pull less - this doesn't matter.
// It has to be done early cause it will invalidate any skb->data/data_end derived pointers.
try_make_readable(skb, l2_header_size + IP6_HLEN + TCP_HLEN);
try_make_writable(skb, l2_header_size + IP6_HLEN + TCP_HLEN);
void* data = (void*)(long)skb->data;
const void* data_end = (void*)(long)skb->data_end;
@@ -369,7 +369,7 @@ static inline __always_inline int do_forward4(struct __sk_buff* skb, const bool
// not trigger and thus we need to manually make sure we can read packet headers via DPA.
// Note: this is a blind best effort pull, which may fail or pull less - this doesn't matter.
// It has to be done early cause it will invalidate any skb->data/data_end derived pointers.
try_make_readable(skb, l2_header_size + IP4_HLEN + TCP_HLEN);
try_make_writable(skb, l2_header_size + IP4_HLEN + TCP_HLEN);
void* data = (void*)(long)skb->data;
const void* data_end = (void*)(long)skb->data_end;