diff options
author | Sabrina Dubroca <sd@queasysnail.net> | 2019-11-25 14:49:01 +0100 |
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committer | Steffen Klassert <steffen.klassert@secunet.com> | 2019-12-09 09:59:07 +0100 |
commit | eecd227a9a3479038ba2a2f579b3ce9edb364b80 (patch) | |
tree | 6ac0973e387f6c20439d469c1ec1dbacb9f14280 /net/ipv4/esp4.c | |
parent | esp4: prepare esp_input_done2 for non-UDP encapsulation (diff) | |
download | linux-eecd227a9a3479038ba2a2f579b3ce9edb364b80.tar.xz linux-eecd227a9a3479038ba2a2f579b3ce9edb364b80.zip |
esp4: split esp_output_udp_encap and introduce esp_output_encap
Co-developed-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Diffstat (limited to 'net/ipv4/esp4.c')
-rw-r--r-- | net/ipv4/esp4.c | 57 |
1 files changed, 37 insertions, 20 deletions
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c index c5d826642229..033c61d27148 100644 --- a/net/ipv4/esp4.c +++ b/net/ipv4/esp4.c @@ -225,45 +225,62 @@ static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto) tail[plen - 1] = proto; } -static int esp_output_udp_encap(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp) +static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb, + int encap_type, + struct esp_info *esp, + __be16 sport, + __be16 dport) { - int encap_type; struct udphdr *uh; __be32 *udpdata32; - __be16 sport, dport; - struct xfrm_encap_tmpl *encap = x->encap; - struct ip_esp_hdr *esph = esp->esph; unsigned int len; - spin_lock_bh(&x->lock); - sport = encap->encap_sport; - dport = encap->encap_dport; - encap_type = encap->encap_type; - spin_unlock_bh(&x->lock); - len = skb->len + esp->tailen - skb_transport_offset(skb); if (len + sizeof(struct iphdr) >= IP_MAX_MTU) - return -EMSGSIZE; + return ERR_PTR(-EMSGSIZE); - uh = (struct udphdr *)esph; + uh = (struct udphdr *)esp->esph; uh->source = sport; uh->dest = dport; uh->len = htons(len); uh->check = 0; + *skb_mac_header(skb) = IPPROTO_UDP; + + if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) { + udpdata32 = (__be32 *)(uh + 1); + udpdata32[0] = udpdata32[1] = 0; + return (struct ip_esp_hdr *)(udpdata32 + 2); + } + + return (struct ip_esp_hdr *)(uh + 1); +} + +static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb, + struct esp_info *esp) +{ + struct xfrm_encap_tmpl *encap = x->encap; + struct ip_esp_hdr *esph; + __be16 sport, dport; + int encap_type; + + spin_lock_bh(&x->lock); + sport = encap->encap_sport; + dport = encap->encap_dport; + encap_type = encap->encap_type; + spin_unlock_bh(&x->lock); + switch (encap_type) { default: case UDP_ENCAP_ESPINUDP: - esph = (struct ip_esp_hdr *)(uh + 1); - break; case UDP_ENCAP_ESPINUDP_NON_IKE: - udpdata32 = (__be32 *)(uh + 1); - udpdata32[0] = udpdata32[1] = 0; - esph = (struct ip_esp_hdr *)(udpdata32 + 2); + esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport); break; } - *skb_mac_header(skb) = IPPROTO_UDP; + if (IS_ERR(esph)) + return PTR_ERR(esph); + esp->esph = esph; return 0; @@ -281,7 +298,7 @@ int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info * /* this is non-NULL only with UDP Encapsulation */ if (x->encap) { - int err = esp_output_udp_encap(x, skb, esp); + int err = esp_output_encap(x, skb, esp); if (err < 0) return err; |