12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
228850dc7SDaniel Borkmann /*
328850dc7SDaniel Borkmann * IPV4 GSO/GRO offload support
428850dc7SDaniel Borkmann * Linux INET implementation
528850dc7SDaniel Borkmann *
628850dc7SDaniel Borkmann * TCPv4 GSO/GRO support
728850dc7SDaniel Borkmann */
828850dc7SDaniel Borkmann
9028e0a47SPaolo Abeni #include <linux/indirect_call_wrapper.h>
1028850dc7SDaniel Borkmann #include <linux/skbuff.h>
114721031cSEric Dumazet #include <net/gro.h>
12d457a0e3SEric Dumazet #include <net/gso.h>
1328850dc7SDaniel Borkmann #include <net/tcp.h>
1428850dc7SDaniel Borkmann #include <net/protocol.h>
1528850dc7SDaniel Borkmann
tcp_gso_tstamp(struct sk_buff * skb,unsigned int ts_seq,unsigned int seq,unsigned int mss)16f066e2b0SWillem de Bruijn static void tcp_gso_tstamp(struct sk_buff *skb, unsigned int ts_seq,
17f066e2b0SWillem de Bruijn unsigned int seq, unsigned int mss)
184ed2d765SWillem de Bruijn {
194ed2d765SWillem de Bruijn while (skb) {
20f066e2b0SWillem de Bruijn if (before(ts_seq, seq + mss)) {
21f066e2b0SWillem de Bruijn skb_shinfo(skb)->tx_flags |= SKBTX_SW_TSTAMP;
224ed2d765SWillem de Bruijn skb_shinfo(skb)->tskey = ts_seq;
234ed2d765SWillem de Bruijn return;
244ed2d765SWillem de Bruijn }
254ed2d765SWillem de Bruijn
264ed2d765SWillem de Bruijn skb = skb->next;
274ed2d765SWillem de Bruijn seq += mss;
284ed2d765SWillem de Bruijn }
294ed2d765SWillem de Bruijn }
304ed2d765SWillem de Bruijn
__tcpv4_gso_segment_csum(struct sk_buff * seg,__be32 * oldip,__be32 newip,__be16 * oldport,__be16 newport)31bee88cd5SFelix Fietkau static void __tcpv4_gso_segment_csum(struct sk_buff *seg,
32bee88cd5SFelix Fietkau __be32 *oldip, __be32 newip,
33bee88cd5SFelix Fietkau __be16 *oldport, __be16 newport)
34bee88cd5SFelix Fietkau {
35bee88cd5SFelix Fietkau struct tcphdr *th;
36bee88cd5SFelix Fietkau struct iphdr *iph;
37bee88cd5SFelix Fietkau
38bee88cd5SFelix Fietkau if (*oldip == newip && *oldport == newport)
39bee88cd5SFelix Fietkau return;
40bee88cd5SFelix Fietkau
41bee88cd5SFelix Fietkau th = tcp_hdr(seg);
42bee88cd5SFelix Fietkau iph = ip_hdr(seg);
43bee88cd5SFelix Fietkau
44bee88cd5SFelix Fietkau inet_proto_csum_replace4(&th->check, seg, *oldip, newip, true);
45bee88cd5SFelix Fietkau inet_proto_csum_replace2(&th->check, seg, *oldport, newport, false);
46bee88cd5SFelix Fietkau *oldport = newport;
47bee88cd5SFelix Fietkau
48bee88cd5SFelix Fietkau csum_replace4(&iph->check, *oldip, newip);
49bee88cd5SFelix Fietkau *oldip = newip;
50bee88cd5SFelix Fietkau }
51bee88cd5SFelix Fietkau
__tcpv4_gso_segment_list_csum(struct sk_buff * segs)52bee88cd5SFelix Fietkau static struct sk_buff *__tcpv4_gso_segment_list_csum(struct sk_buff *segs)
53bee88cd5SFelix Fietkau {
54bee88cd5SFelix Fietkau const struct tcphdr *th;
55bee88cd5SFelix Fietkau const struct iphdr *iph;
56bee88cd5SFelix Fietkau struct sk_buff *seg;
57bee88cd5SFelix Fietkau struct tcphdr *th2;
58bee88cd5SFelix Fietkau struct iphdr *iph2;
59bee88cd5SFelix Fietkau
60bee88cd5SFelix Fietkau seg = segs;
61bee88cd5SFelix Fietkau th = tcp_hdr(seg);
62bee88cd5SFelix Fietkau iph = ip_hdr(seg);
63bee88cd5SFelix Fietkau th2 = tcp_hdr(seg->next);
64bee88cd5SFelix Fietkau iph2 = ip_hdr(seg->next);
65bee88cd5SFelix Fietkau
66bee88cd5SFelix Fietkau if (!(*(const u32 *)&th->source ^ *(const u32 *)&th2->source) &&
67bee88cd5SFelix Fietkau iph->daddr == iph2->daddr && iph->saddr == iph2->saddr)
68bee88cd5SFelix Fietkau return segs;
69bee88cd5SFelix Fietkau
70bee88cd5SFelix Fietkau while ((seg = seg->next)) {
71bee88cd5SFelix Fietkau th2 = tcp_hdr(seg);
72bee88cd5SFelix Fietkau iph2 = ip_hdr(seg);
73bee88cd5SFelix Fietkau
74bee88cd5SFelix Fietkau __tcpv4_gso_segment_csum(seg,
75bee88cd5SFelix Fietkau &iph2->saddr, iph->saddr,
76bee88cd5SFelix Fietkau &th2->source, th->source);
77bee88cd5SFelix Fietkau __tcpv4_gso_segment_csum(seg,
78bee88cd5SFelix Fietkau &iph2->daddr, iph->daddr,
79bee88cd5SFelix Fietkau &th2->dest, th->dest);
80bee88cd5SFelix Fietkau }
81bee88cd5SFelix Fietkau
82bee88cd5SFelix Fietkau return segs;
83bee88cd5SFelix Fietkau }
84bee88cd5SFelix Fietkau
__tcp4_gso_segment_list(struct sk_buff * skb,netdev_features_t features)85bee88cd5SFelix Fietkau static struct sk_buff *__tcp4_gso_segment_list(struct sk_buff *skb,
86bee88cd5SFelix Fietkau netdev_features_t features)
87bee88cd5SFelix Fietkau {
88bee88cd5SFelix Fietkau skb = skb_segment_list(skb, features, skb_mac_header_len(skb));
89bee88cd5SFelix Fietkau if (IS_ERR(skb))
90bee88cd5SFelix Fietkau return skb;
91bee88cd5SFelix Fietkau
92bee88cd5SFelix Fietkau return __tcpv4_gso_segment_list_csum(skb);
93bee88cd5SFelix Fietkau }
94bee88cd5SFelix Fietkau
tcp4_gso_segment(struct sk_buff * skb,netdev_features_t features)9574abc20cSEric Dumazet static struct sk_buff *tcp4_gso_segment(struct sk_buff *skb,
96d020f8f7STom Herbert netdev_features_t features)
97d020f8f7STom Herbert {
98121d57afSWillem de Bruijn if (!(skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4))
99121d57afSWillem de Bruijn return ERR_PTR(-EINVAL);
100121d57afSWillem de Bruijn
101d020f8f7STom Herbert if (!pskb_may_pull(skb, sizeof(struct tcphdr)))
102d020f8f7STom Herbert return ERR_PTR(-EINVAL);
103d020f8f7STom Herbert
104bee88cd5SFelix Fietkau if (skb_shinfo(skb)->gso_type & SKB_GSO_FRAGLIST)
105bee88cd5SFelix Fietkau return __tcp4_gso_segment_list(skb, features);
106bee88cd5SFelix Fietkau
107d020f8f7STom Herbert if (unlikely(skb->ip_summed != CHECKSUM_PARTIAL)) {
108d020f8f7STom Herbert const struct iphdr *iph = ip_hdr(skb);
109d020f8f7STom Herbert struct tcphdr *th = tcp_hdr(skb);
110d020f8f7STom Herbert
111d020f8f7STom Herbert /* Set up checksum pseudo header, usually expect stack to
112d020f8f7STom Herbert * have done this already.
113d020f8f7STom Herbert */
114d020f8f7STom Herbert
115d020f8f7STom Herbert th->check = 0;
116d020f8f7STom Herbert skb->ip_summed = CHECKSUM_PARTIAL;
117d020f8f7STom Herbert __tcp_v4_send_check(skb, iph->saddr, iph->daddr);
118d020f8f7STom Herbert }
119d020f8f7STom Herbert
120d020f8f7STom Herbert return tcp_gso_segment(skb, features);
121d020f8f7STom Herbert }
122d020f8f7STom Herbert
tcp_gso_segment(struct sk_buff * skb,netdev_features_t features)12328be6e07SEric Dumazet struct sk_buff *tcp_gso_segment(struct sk_buff *skb,
12428850dc7SDaniel Borkmann netdev_features_t features)
12528850dc7SDaniel Borkmann {
12628850dc7SDaniel Borkmann struct sk_buff *segs = ERR_PTR(-EINVAL);
1270d08c42cSEric Dumazet unsigned int sum_truesize = 0;
12828850dc7SDaniel Borkmann struct tcphdr *th;
12928850dc7SDaniel Borkmann unsigned int thlen;
13028850dc7SDaniel Borkmann unsigned int seq;
13128850dc7SDaniel Borkmann unsigned int oldlen;
13228850dc7SDaniel Borkmann unsigned int mss;
13328850dc7SDaniel Borkmann struct sk_buff *gso_skb = skb;
13428850dc7SDaniel Borkmann __sum16 newcheck;
13528850dc7SDaniel Borkmann bool ooo_okay, copy_destructor;
13682a01ab3SEric Dumazet __wsum delta;
13728850dc7SDaniel Borkmann
13828850dc7SDaniel Borkmann th = tcp_hdr(skb);
13928850dc7SDaniel Borkmann thlen = th->doff * 4;
14028850dc7SDaniel Borkmann if (thlen < sizeof(*th))
14128850dc7SDaniel Borkmann goto out;
14228850dc7SDaniel Borkmann
143*89add400SWillem de Bruijn if (unlikely(skb_checksum_start(skb) != skb_transport_header(skb)))
144*89add400SWillem de Bruijn goto out;
145*89add400SWillem de Bruijn
14628850dc7SDaniel Borkmann if (!pskb_may_pull(skb, thlen))
14728850dc7SDaniel Borkmann goto out;
14828850dc7SDaniel Borkmann
14982a01ab3SEric Dumazet oldlen = ~skb->len;
15028850dc7SDaniel Borkmann __skb_pull(skb, thlen);
15128850dc7SDaniel Borkmann
152a7eea416SEric Dumazet mss = skb_shinfo(skb)->gso_size;
15328850dc7SDaniel Borkmann if (unlikely(skb->len <= mss))
15428850dc7SDaniel Borkmann goto out;
15528850dc7SDaniel Borkmann
15628850dc7SDaniel Borkmann if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
15728850dc7SDaniel Borkmann /* Packet is from an untrusted source, reset gso_segs. */
15828850dc7SDaniel Borkmann
15928850dc7SDaniel Borkmann skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
16028850dc7SDaniel Borkmann
16128850dc7SDaniel Borkmann segs = NULL;
16228850dc7SDaniel Borkmann goto out;
16328850dc7SDaniel Borkmann }
16428850dc7SDaniel Borkmann
16528850dc7SDaniel Borkmann copy_destructor = gso_skb->destructor == tcp_wfree;
16628850dc7SDaniel Borkmann ooo_okay = gso_skb->ooo_okay;
16728850dc7SDaniel Borkmann /* All segments but the first should have ooo_okay cleared */
16828850dc7SDaniel Borkmann skb->ooo_okay = 0;
16928850dc7SDaniel Borkmann
17028850dc7SDaniel Borkmann segs = skb_segment(skb, features);
17128850dc7SDaniel Borkmann if (IS_ERR(segs))
17228850dc7SDaniel Borkmann goto out;
17328850dc7SDaniel Borkmann
17428850dc7SDaniel Borkmann /* Only first segment might have ooo_okay set */
17528850dc7SDaniel Borkmann segs->ooo_okay = ooo_okay;
17628850dc7SDaniel Borkmann
17707b26c94SSteffen Klassert /* GSO partial and frag_list segmentation only requires splitting
17807b26c94SSteffen Klassert * the frame into an MSS multiple and possibly a remainder, both
17907b26c94SSteffen Klassert * cases return a GSO skb. So update the mss now.
18007b26c94SSteffen Klassert */
18107b26c94SSteffen Klassert if (skb_is_gso(segs))
18207b26c94SSteffen Klassert mss *= skb_shinfo(segs)->gso_segs;
18307b26c94SSteffen Klassert
18482a01ab3SEric Dumazet delta = (__force __wsum)htonl(oldlen + thlen + mss);
18528850dc7SDaniel Borkmann
18628850dc7SDaniel Borkmann skb = segs;
18728850dc7SDaniel Borkmann th = tcp_hdr(skb);
18828850dc7SDaniel Borkmann seq = ntohl(th->seq);
18928850dc7SDaniel Borkmann
1904ed2d765SWillem de Bruijn if (unlikely(skb_shinfo(gso_skb)->tx_flags & SKBTX_SW_TSTAMP))
1914ed2d765SWillem de Bruijn tcp_gso_tstamp(segs, skb_shinfo(gso_skb)->tskey, seq, mss);
1924ed2d765SWillem de Bruijn
19382a01ab3SEric Dumazet newcheck = ~csum_fold(csum_add(csum_unfold(th->check), delta));
19428850dc7SDaniel Borkmann
195802ab55aSAlexander Duyck while (skb->next) {
19628850dc7SDaniel Borkmann th->fin = th->psh = 0;
19728850dc7SDaniel Borkmann th->check = newcheck;
19828850dc7SDaniel Borkmann
19908b64fccSAlexander Duyck if (skb->ip_summed == CHECKSUM_PARTIAL)
20008b64fccSAlexander Duyck gso_reset_checksum(skb, ~th->check);
20108b64fccSAlexander Duyck else
202e9c3a24bSTom Herbert th->check = gso_make_checksum(skb, ~th->check);
20328850dc7SDaniel Borkmann
20428850dc7SDaniel Borkmann seq += mss;
20528850dc7SDaniel Borkmann if (copy_destructor) {
20628850dc7SDaniel Borkmann skb->destructor = gso_skb->destructor;
20728850dc7SDaniel Borkmann skb->sk = gso_skb->sk;
2080d08c42cSEric Dumazet sum_truesize += skb->truesize;
20928850dc7SDaniel Borkmann }
21028850dc7SDaniel Borkmann skb = skb->next;
21128850dc7SDaniel Borkmann th = tcp_hdr(skb);
21228850dc7SDaniel Borkmann
21328850dc7SDaniel Borkmann th->seq = htonl(seq);
21428850dc7SDaniel Borkmann th->cwr = 0;
215802ab55aSAlexander Duyck }
21628850dc7SDaniel Borkmann
21728850dc7SDaniel Borkmann /* Following permits TCP Small Queues to work well with GSO :
21828850dc7SDaniel Borkmann * The callback to TCP stack will be called at the time last frag
21928850dc7SDaniel Borkmann * is freed at TX completion, and not right now when gso_skb
22028850dc7SDaniel Borkmann * is freed by GSO engine
22128850dc7SDaniel Borkmann */
22228850dc7SDaniel Borkmann if (copy_destructor) {
2237ec318feSEric Dumazet int delta;
2247ec318feSEric Dumazet
22528850dc7SDaniel Borkmann swap(gso_skb->sk, skb->sk);
22628850dc7SDaniel Borkmann swap(gso_skb->destructor, skb->destructor);
2270d08c42cSEric Dumazet sum_truesize += skb->truesize;
2287ec318feSEric Dumazet delta = sum_truesize - gso_skb->truesize;
2297ec318feSEric Dumazet /* In some pathological cases, delta can be negative.
2307ec318feSEric Dumazet * We need to either use refcount_add() or refcount_sub_and_test()
2317ec318feSEric Dumazet */
2327ec318feSEric Dumazet if (likely(delta >= 0))
2337ec318feSEric Dumazet refcount_add(delta, &skb->sk->sk_wmem_alloc);
2347ec318feSEric Dumazet else
2357ec318feSEric Dumazet WARN_ON_ONCE(refcount_sub_and_test(-delta, &skb->sk->sk_wmem_alloc));
23628850dc7SDaniel Borkmann }
23728850dc7SDaniel Borkmann
23882a01ab3SEric Dumazet delta = (__force __wsum)htonl(oldlen +
23982a01ab3SEric Dumazet (skb_tail_pointer(skb) -
24028850dc7SDaniel Borkmann skb_transport_header(skb)) +
24128850dc7SDaniel Borkmann skb->data_len);
24282a01ab3SEric Dumazet th->check = ~csum_fold(csum_add(csum_unfold(th->check), delta));
24308b64fccSAlexander Duyck if (skb->ip_summed == CHECKSUM_PARTIAL)
24408b64fccSAlexander Duyck gso_reset_checksum(skb, ~th->check);
24508b64fccSAlexander Duyck else
246e9c3a24bSTom Herbert th->check = gso_make_checksum(skb, ~th->check);
24728850dc7SDaniel Borkmann out:
24828850dc7SDaniel Borkmann return segs;
24928850dc7SDaniel Borkmann }
25028850dc7SDaniel Borkmann
tcp_gro_lookup(struct list_head * head,struct tcphdr * th)25180e85fbdSFelix Fietkau struct sk_buff *tcp_gro_lookup(struct list_head *head, struct tcphdr *th)
25280e85fbdSFelix Fietkau {
25380e85fbdSFelix Fietkau struct tcphdr *th2;
25480e85fbdSFelix Fietkau struct sk_buff *p;
25580e85fbdSFelix Fietkau
25680e85fbdSFelix Fietkau list_for_each_entry(p, head, list) {
25780e85fbdSFelix Fietkau if (!NAPI_GRO_CB(p)->same_flow)
25880e85fbdSFelix Fietkau continue;
25980e85fbdSFelix Fietkau
26080e85fbdSFelix Fietkau th2 = tcp_hdr(p);
26180e85fbdSFelix Fietkau if (*(u32 *)&th->source ^ *(u32 *)&th2->source) {
26280e85fbdSFelix Fietkau NAPI_GRO_CB(p)->same_flow = 0;
26380e85fbdSFelix Fietkau continue;
26480e85fbdSFelix Fietkau }
26580e85fbdSFelix Fietkau
26680e85fbdSFelix Fietkau return p;
26780e85fbdSFelix Fietkau }
26880e85fbdSFelix Fietkau
26980e85fbdSFelix Fietkau return NULL;
27080e85fbdSFelix Fietkau }
27180e85fbdSFelix Fietkau
tcp_gro_pull_header(struct sk_buff * skb)2727516b27cSFelix Fietkau struct tcphdr *tcp_gro_pull_header(struct sk_buff *skb)
27328850dc7SDaniel Borkmann {
2747516b27cSFelix Fietkau unsigned int thlen, hlen, off;
27528850dc7SDaniel Borkmann struct tcphdr *th;
27628850dc7SDaniel Borkmann
27728850dc7SDaniel Borkmann off = skb_gro_offset(skb);
27828850dc7SDaniel Borkmann hlen = off + sizeof(*th);
27935ffb665SRichard Gobert th = skb_gro_header(skb, hlen, off);
28028850dc7SDaniel Borkmann if (unlikely(!th))
2817516b27cSFelix Fietkau return NULL;
28228850dc7SDaniel Borkmann
28328850dc7SDaniel Borkmann thlen = th->doff * 4;
28428850dc7SDaniel Borkmann if (thlen < sizeof(*th))
2857516b27cSFelix Fietkau return NULL;
28628850dc7SDaniel Borkmann
28728850dc7SDaniel Borkmann hlen = off + thlen;
28893e16ea0SEric Dumazet if (!skb_gro_may_pull(skb, hlen)) {
28928850dc7SDaniel Borkmann th = skb_gro_header_slow(skb, hlen, off);
29028850dc7SDaniel Borkmann if (unlikely(!th))
2917516b27cSFelix Fietkau return NULL;
29228850dc7SDaniel Borkmann }
29328850dc7SDaniel Borkmann
29428850dc7SDaniel Borkmann skb_gro_pull(skb, thlen);
29528850dc7SDaniel Borkmann
2967516b27cSFelix Fietkau return th;
2977516b27cSFelix Fietkau }
2987516b27cSFelix Fietkau
tcp_gro_receive(struct list_head * head,struct sk_buff * skb,struct tcphdr * th)2997516b27cSFelix Fietkau struct sk_buff *tcp_gro_receive(struct list_head *head, struct sk_buff *skb,
3007516b27cSFelix Fietkau struct tcphdr *th)
3017516b27cSFelix Fietkau {
3027516b27cSFelix Fietkau unsigned int thlen = th->doff * 4;
3037516b27cSFelix Fietkau struct sk_buff *pp = NULL;
3047516b27cSFelix Fietkau struct sk_buff *p;
3057516b27cSFelix Fietkau struct tcphdr *th2;
3067516b27cSFelix Fietkau unsigned int len;
3077516b27cSFelix Fietkau __be32 flags;
3087516b27cSFelix Fietkau unsigned int mss = 1;
3097516b27cSFelix Fietkau int flush = 1;
3107516b27cSFelix Fietkau int i;
3117516b27cSFelix Fietkau
31228850dc7SDaniel Borkmann len = skb_gro_len(skb);
31328850dc7SDaniel Borkmann flags = tcp_flag_word(th);
31428850dc7SDaniel Borkmann
31580e85fbdSFelix Fietkau p = tcp_gro_lookup(head, th);
31680e85fbdSFelix Fietkau if (!p)
31728850dc7SDaniel Borkmann goto out_check_final;
31828850dc7SDaniel Borkmann
31980e85fbdSFelix Fietkau th2 = tcp_hdr(p);
3204b0ebbcaSRichard Gobert flush = (__force int)(flags & TCP_FLAG_CWR);
32128850dc7SDaniel Borkmann flush |= (__force int)((flags ^ tcp_flag_word(th2)) &
32228850dc7SDaniel Borkmann ~(TCP_FLAG_CWR | TCP_FLAG_FIN | TCP_FLAG_PSH));
32328850dc7SDaniel Borkmann flush |= (__force int)(th->ack_seq ^ th2->ack_seq);
32428850dc7SDaniel Borkmann for (i = sizeof(*th); i < thlen; i += 4)
32528850dc7SDaniel Borkmann flush |= *(u32 *)((u8 *)th + i) ^
32628850dc7SDaniel Borkmann *(u32 *)((u8 *)th2 + i);
32728850dc7SDaniel Borkmann
3284b0ebbcaSRichard Gobert flush |= gro_receive_network_flush(th, th2, p);
3291530545eSAlexander Duyck
330a7eea416SEric Dumazet mss = skb_shinfo(p)->gso_size;
33128850dc7SDaniel Borkmann
3325eddb249SCoco Li /* If skb is a GRO packet, make sure its gso_size matches prior packet mss.
3335eddb249SCoco Li * If it is a single frame, do not aggregate it if its length
3345eddb249SCoco Li * is bigger than our mss.
3355eddb249SCoco Li */
3365eddb249SCoco Li if (unlikely(skb_is_gso(skb)))
3375eddb249SCoco Li flush |= (mss != skb_shinfo(skb)->gso_size);
3385eddb249SCoco Li else
33928850dc7SDaniel Borkmann flush |= (len - 1) >= mss;
3405eddb249SCoco Li
34128850dc7SDaniel Borkmann flush |= (ntohl(th2->seq) + skb_gro_len(p)) ^ ntohl(th->seq);
3429f06f87fSJakub Kicinski flush |= skb_cmp_decrypted(p, skb);
34328850dc7SDaniel Borkmann
3448d95dc47SFelix Fietkau if (unlikely(NAPI_GRO_CB(p)->is_flist)) {
3458d95dc47SFelix Fietkau flush |= (__force int)(flags ^ tcp_flag_word(th2));
3468d95dc47SFelix Fietkau flush |= skb->ip_summed != p->ip_summed;
3478d95dc47SFelix Fietkau flush |= skb->csum_level != p->csum_level;
3488d95dc47SFelix Fietkau flush |= NAPI_GRO_CB(p)->count >= 64;
3498d95dc47SFelix Fietkau
3508d95dc47SFelix Fietkau if (flush || skb_gro_receive_list(p, skb))
3518d95dc47SFelix Fietkau mss = 1;
3528d95dc47SFelix Fietkau
3538d95dc47SFelix Fietkau goto out_check_final;
3548d95dc47SFelix Fietkau }
3558d95dc47SFelix Fietkau
356d4546c25SDavid Miller if (flush || skb_gro_receive(p, skb)) {
35728850dc7SDaniel Borkmann mss = 1;
35828850dc7SDaniel Borkmann goto out_check_final;
35928850dc7SDaniel Borkmann }
36028850dc7SDaniel Borkmann
36128850dc7SDaniel Borkmann tcp_flag_word(th2) |= flags & (TCP_FLAG_FIN | TCP_FLAG_PSH);
36228850dc7SDaniel Borkmann
36328850dc7SDaniel Borkmann out_check_final:
3645eddb249SCoco Li /* Force a flush if last segment is smaller than mss. */
3655eddb249SCoco Li if (unlikely(skb_is_gso(skb)))
3665eddb249SCoco Li flush = len != NAPI_GRO_CB(skb)->count * skb_shinfo(skb)->gso_size;
3675eddb249SCoco Li else
36828850dc7SDaniel Borkmann flush = len < mss;
3695eddb249SCoco Li
37028850dc7SDaniel Borkmann flush |= (__force int)(flags & (TCP_FLAG_URG | TCP_FLAG_PSH |
37128850dc7SDaniel Borkmann TCP_FLAG_RST | TCP_FLAG_SYN |
37228850dc7SDaniel Borkmann TCP_FLAG_FIN));
37328850dc7SDaniel Borkmann
37428850dc7SDaniel Borkmann if (p && (!NAPI_GRO_CB(skb)->same_flow || flush))
375d4546c25SDavid Miller pp = p;
37628850dc7SDaniel Borkmann
377bf5a755fSJerry Chu NAPI_GRO_CB(skb)->flush |= (flush != 0);
37828850dc7SDaniel Borkmann
37928850dc7SDaniel Borkmann return pp;
38028850dc7SDaniel Borkmann }
38128850dc7SDaniel Borkmann
tcp_gro_complete(struct sk_buff * skb)382b1f2abcfSParav Pandit void tcp_gro_complete(struct sk_buff *skb)
38328850dc7SDaniel Borkmann {
38428850dc7SDaniel Borkmann struct tcphdr *th = tcp_hdr(skb);
3858f78010bSEric Dumazet struct skb_shared_info *shinfo;
3868f78010bSEric Dumazet
3878f78010bSEric Dumazet if (skb->encapsulation)
3888f78010bSEric Dumazet skb->inner_transport_header = skb->transport_header;
38928850dc7SDaniel Borkmann
390299603e8SJerry Chu skb->csum_start = (unsigned char *)th - skb->head;
39128850dc7SDaniel Borkmann skb->csum_offset = offsetof(struct tcphdr, check);
39228850dc7SDaniel Borkmann skb->ip_summed = CHECKSUM_PARTIAL;
39328850dc7SDaniel Borkmann
3948f78010bSEric Dumazet shinfo = skb_shinfo(skb);
3958f78010bSEric Dumazet shinfo->gso_segs = NAPI_GRO_CB(skb)->count;
39628850dc7SDaniel Borkmann
39728850dc7SDaniel Borkmann if (th->cwr)
3988f78010bSEric Dumazet shinfo->gso_type |= SKB_GSO_TCP_ECN;
39928850dc7SDaniel Borkmann }
40028850dc7SDaniel Borkmann EXPORT_SYMBOL(tcp_gro_complete);
40128850dc7SDaniel Borkmann
tcp4_check_fraglist_gro(struct list_head * head,struct sk_buff * skb,struct tcphdr * th)402c9d1d23eSFelix Fietkau static void tcp4_check_fraglist_gro(struct list_head *head, struct sk_buff *skb,
403c9d1d23eSFelix Fietkau struct tcphdr *th)
404c9d1d23eSFelix Fietkau {
405c9d1d23eSFelix Fietkau const struct iphdr *iph;
406c9d1d23eSFelix Fietkau struct sk_buff *p;
407c9d1d23eSFelix Fietkau struct sock *sk;
408c9d1d23eSFelix Fietkau struct net *net;
409c9d1d23eSFelix Fietkau int iif, sdif;
410c9d1d23eSFelix Fietkau
411c9d1d23eSFelix Fietkau if (likely(!(skb->dev->features & NETIF_F_GRO_FRAGLIST)))
412c9d1d23eSFelix Fietkau return;
413c9d1d23eSFelix Fietkau
414c9d1d23eSFelix Fietkau p = tcp_gro_lookup(head, th);
415c9d1d23eSFelix Fietkau if (p) {
416c9d1d23eSFelix Fietkau NAPI_GRO_CB(skb)->is_flist = NAPI_GRO_CB(p)->is_flist;
417c9d1d23eSFelix Fietkau return;
418c9d1d23eSFelix Fietkau }
419c9d1d23eSFelix Fietkau
420c9d1d23eSFelix Fietkau inet_get_iif_sdif(skb, &iif, &sdif);
421c9d1d23eSFelix Fietkau iph = skb_gro_network_header(skb);
422c9d1d23eSFelix Fietkau net = dev_net(skb->dev);
423c9d1d23eSFelix Fietkau sk = __inet_lookup_established(net, net->ipv4.tcp_death_row.hashinfo,
424c9d1d23eSFelix Fietkau iph->saddr, th->source,
425c9d1d23eSFelix Fietkau iph->daddr, ntohs(th->dest),
426c9d1d23eSFelix Fietkau iif, sdif);
427c9d1d23eSFelix Fietkau NAPI_GRO_CB(skb)->is_flist = !sk;
428c9d1d23eSFelix Fietkau if (sk)
429c9d1d23eSFelix Fietkau sock_put(sk);
430c9d1d23eSFelix Fietkau }
431c9d1d23eSFelix Fietkau
432028e0a47SPaolo Abeni INDIRECT_CALLABLE_SCOPE
tcp4_gro_receive(struct list_head * head,struct sk_buff * skb)433028e0a47SPaolo Abeni struct sk_buff *tcp4_gro_receive(struct list_head *head, struct sk_buff *skb)
43428850dc7SDaniel Borkmann {
4357516b27cSFelix Fietkau struct tcphdr *th;
4367516b27cSFelix Fietkau
437cc5c00bbSHerbert Xu /* Don't bother verifying checksum if we're going to flush anyway. */
438149d0774STom Herbert if (!NAPI_GRO_CB(skb)->flush &&
439149d0774STom Herbert skb_gro_checksum_validate(skb, IPPROTO_TCP,
4407516b27cSFelix Fietkau inet_gro_compute_pseudo))
4417516b27cSFelix Fietkau goto flush;
4427516b27cSFelix Fietkau
4437516b27cSFelix Fietkau th = tcp_gro_pull_header(skb);
4447516b27cSFelix Fietkau if (!th)
4457516b27cSFelix Fietkau goto flush;
4467516b27cSFelix Fietkau
447c9d1d23eSFelix Fietkau tcp4_check_fraglist_gro(head, skb, th);
448c9d1d23eSFelix Fietkau
4497516b27cSFelix Fietkau return tcp_gro_receive(head, skb, th);
4507516b27cSFelix Fietkau
4517516b27cSFelix Fietkau flush:
45228850dc7SDaniel Borkmann NAPI_GRO_CB(skb)->flush = 1;
45328850dc7SDaniel Borkmann return NULL;
45428850dc7SDaniel Borkmann }
45528850dc7SDaniel Borkmann
tcp4_gro_complete(struct sk_buff * skb,int thoff)456028e0a47SPaolo Abeni INDIRECT_CALLABLE_SCOPE int tcp4_gro_complete(struct sk_buff *skb, int thoff)
45728850dc7SDaniel Borkmann {
458186b1ea7SRichard Gobert const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation];
459186b1ea7SRichard Gobert const struct iphdr *iph = (struct iphdr *)(skb->data + offset);
46028850dc7SDaniel Borkmann struct tcphdr *th = tcp_hdr(skb);
46128850dc7SDaniel Borkmann
4628d95dc47SFelix Fietkau if (unlikely(NAPI_GRO_CB(skb)->is_flist)) {
4638d95dc47SFelix Fietkau skb_shinfo(skb)->gso_type |= SKB_GSO_FRAGLIST | SKB_GSO_TCPV4;
4648d95dc47SFelix Fietkau skb_shinfo(skb)->gso_segs = NAPI_GRO_CB(skb)->count;
4658d95dc47SFelix Fietkau
4668d95dc47SFelix Fietkau __skb_incr_checksum_unnecessary(skb);
4678d95dc47SFelix Fietkau
4688d95dc47SFelix Fietkau return 0;
4698d95dc47SFelix Fietkau }
4708d95dc47SFelix Fietkau
471299603e8SJerry Chu th->check = ~tcp_v4_check(skb->len - thoff, iph->saddr,
472299603e8SJerry Chu iph->daddr, 0);
47328850dc7SDaniel Borkmann
4748f78010bSEric Dumazet skb_shinfo(skb)->gso_type |= SKB_GSO_TCPV4 |
4754b0ebbcaSRichard Gobert (NAPI_GRO_CB(skb)->ip_fixedid * SKB_GSO_TCP_FIXEDID);
4761530545eSAlexander Duyck
477b1f2abcfSParav Pandit tcp_gro_complete(skb);
478b1f2abcfSParav Pandit return 0;
47928850dc7SDaniel Borkmann }
48028850dc7SDaniel Borkmann
tcpv4_offload_init(void)4810139806eSEric Dumazet int __init tcpv4_offload_init(void)
4820139806eSEric Dumazet {
4830139806eSEric Dumazet net_hotdata.tcpv4_offload = (struct net_offload) {
48428850dc7SDaniel Borkmann .callbacks = {
485d020f8f7STom Herbert .gso_segment = tcp4_gso_segment,
48628850dc7SDaniel Borkmann .gro_receive = tcp4_gro_receive,
48728850dc7SDaniel Borkmann .gro_complete = tcp4_gro_complete,
48828850dc7SDaniel Borkmann },
48928850dc7SDaniel Borkmann };
4900139806eSEric Dumazet return inet_add_offload(&net_hotdata.tcpv4_offload, IPPROTO_TCP);
49128850dc7SDaniel Borkmann }
492