diff options
| -rw-r--r-- | include/net/protocol.h | 3 | ||||
| -rw-r--r-- | net/ipv4/af_inet.c | 97 |
2 files changed, 100 insertions, 0 deletions
diff --git a/include/net/protocol.h b/include/net/protocol.h index 8d024d7cb74..cb2965aa1b6 100644 --- a/include/net/protocol.h +++ b/include/net/protocol.h @@ -39,6 +39,9 @@ struct net_protocol { int (*gso_send_check)(struct sk_buff *skb); struct sk_buff *(*gso_segment)(struct sk_buff *skb, int features); + struct sk_buff **(*gro_receive)(struct sk_buff **head, + struct sk_buff *skb); + int (*gro_complete)(struct sk_buff *skb); unsigned int no_policy:1, netns_ok:1; }; diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index fe03048c130..a85595307fa 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -94,6 +94,7 @@ #include <linux/igmp.h> #include <linux/inetdevice.h> #include <linux/netdevice.h> +#include <net/checksum.h> #include <net/ip.h> #include <net/protocol.h> #include <net/arp.h> @@ -1241,6 +1242,100 @@ out: return segs; } +static struct sk_buff **inet_gro_receive(struct sk_buff **head, + struct sk_buff *skb) +{ + struct net_protocol *ops; + struct sk_buff **pp = NULL; + struct sk_buff *p; + struct iphdr *iph; + int flush = 1; + int proto; + int id; + + if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) + goto out; + + iph = ip_hdr(skb); + proto = iph->protocol & (MAX_INET_PROTOS - 1); + + rcu_read_lock(); + ops = rcu_dereference(inet_protos[proto]); + if (!ops || !ops->gro_receive) + goto out_unlock; + + if (iph->version != 4 || iph->ihl != 5) + goto out_unlock; + + if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl))) + goto out_unlock; + + flush = ntohs(iph->tot_len) != skb->len || + iph->frag_off != htons(IP_DF); + id = ntohs(iph->id); + + for (p = *head; p; p = p->next) { + struct iphdr *iph2; + + if (!NAPI_GRO_CB(p)->same_flow) + continue; + + iph2 = ip_hdr(p); + + if (iph->protocol != iph2->protocol || + iph->tos != iph2->tos || + memcmp(&iph->saddr, &iph2->saddr, 8)) { + NAPI_GRO_CB(p)->same_flow = 0; + continue; + } + + /* All fields must match except length and checksum. */ + NAPI_GRO_CB(p)->flush |= + memcmp(&iph->frag_off, &iph2->frag_off, 4) || + (u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) != id; + + NAPI_GRO_CB(p)->flush |= flush; + } + + NAPI_GRO_CB(skb)->flush |= flush; + __skb_pull(skb, sizeof(*iph)); + skb_reset_transport_header(skb); + + pp = ops->gro_receive(head, skb); + +out_unlock: + rcu_read_unlock(); + +out: + NAPI_GRO_CB(skb)->flush |= flush; + + return pp; +} + +static int inet_gro_complete(struct sk_buff *skb) +{ + struct net_protocol *ops; + struct iphdr *iph = ip_hdr(skb); + int proto = iph->protocol & (MAX_INET_PROTOS - 1); + int err = -ENOSYS; + __be16 newlen = htons(skb->len - skb_network_offset(skb)); + + csum_replace2(&iph->check, iph->tot_len, newlen); + iph->tot_len = newlen; + + rcu_read_lock(); + ops = rcu_dereference(inet_protos[proto]); + if (WARN_ON(!ops || !ops->gro_complete)) + goto out_unlock; + + err = ops->gro_complete(skb); + +out_unlock: + rcu_read_unlock(); + + return err; +} + int inet_ctl_sock_create(struct sock **sk, unsigned short family, unsigned short type, unsigned char protocol, struct net *net) @@ -1407,6 +1502,8 @@ static struct packet_type ip_packet_type = { .func = ip_rcv, .gso_send_check = inet_gso_send_check, .gso_segment = inet_gso_segment, + .gro_receive = inet_gro_receive, + .gro_complete = inet_gro_complete, }; static int __init inet_init(void) |