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| author |   Mark Brown <broonie@kernel.org> | 2017-12-04 17:59:52 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2017-12-04 17:59:52 +0000 |
| commit | d218439feccafaa3e852bbaecc0d9f6110096b65 (patch) | |
| tree | c4ebfeaebd965735cea5d90332d0f8013b79e628 /net/nsh/nsh.c | |
| parent | ASoC: AMD: Make the driver name consistent across files (diff) | |
| parent | ASoC: amd: Add error checking to probe function (diff) | |
| download | linux-rng-d218439feccafaa3e852bbaecc0d9f6110096b65.tar.xz linux-rng-d218439feccafaa3e852bbaecc0d9f6110096b65.zip | |
Merge branch 'fix/amd' of https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound into asoc-amd
Diffstat (limited to 'net/nsh/nsh.c')
| -rw-r--r-- | net/nsh/nsh.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/net/nsh/nsh.c b/net/nsh/nsh.c index 58fb827439a8..d7da99a0b0b8 100644 --- a/net/nsh/nsh.c +++ b/net/nsh/nsh.c @@ -14,6 +14,66 @@ #include <net/nsh.h> #include <net/tun_proto.h> +int nsh_push(struct sk_buff *skb, const struct nshhdr *pushed_nh) +{ + struct nshhdr *nh; + size_t length = nsh_hdr_len(pushed_nh); + u8 next_proto; + + if (skb->mac_len) { + next_proto = TUN_P_ETHERNET; + } else { + next_proto = tun_p_from_eth_p(skb->protocol); + if (!next_proto) + return -EAFNOSUPPORT; + } + + /* Add the NSH header */ + if (skb_cow_head(skb, length) < 0) + return -ENOMEM; + + skb_push(skb, length); + nh = (struct nshhdr *)(skb->data); + memcpy(nh, pushed_nh, length); + nh->np = next_proto; + skb_postpush_rcsum(skb, nh, length); + + skb->protocol = htons(ETH_P_NSH); + skb_reset_mac_header(skb); + skb_reset_network_header(skb); + skb_reset_mac_len(skb); + + return 0; +} +EXPORT_SYMBOL_GPL(nsh_push); + +int nsh_pop(struct sk_buff *skb) +{ + struct nshhdr *nh; + size_t length; + __be16 inner_proto; + + if (!pskb_may_pull(skb, NSH_BASE_HDR_LEN)) + return -ENOMEM; + nh = (struct nshhdr *)(skb->data); + length = nsh_hdr_len(nh); + inner_proto = tun_p_to_eth_p(nh->np); + if (!pskb_may_pull(skb, length)) + return -ENOMEM; + + if (!inner_proto) + return -EAFNOSUPPORT; + + skb_pull_rcsum(skb, length); + skb_reset_mac_header(skb); + skb_reset_network_header(skb); + skb_reset_mac_len(skb); + skb->protocol = inner_proto; + + return 0; +} +EXPORT_SYMBOL_GPL(nsh_pop); + static struct sk_buff *nsh_gso_segment(struct sk_buff *skb, netdev_features_t features) { |